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JP2007116636

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2007116636
The present invention provides a screen speaker in which deformation of a screen speaker is
suppressed by reducing a difference between deformation amounts of a screen and a support
due to temperature change. SOLUTION: A screen (S) of a screen speaker (10) and a support (20)
for supporting the screen (S) are both made of metal materials of the same material such as
aluminum and have the same thermal expansion coefficient, Or, they are configured almost
equally. [Selected figure] Figure 1
スクリーンスピーカー
[0001]
The present invention relates to a so-called screen speaker which directly drives a screen and
emits sound from the screen surface.
[0002]
When an image such as a movie is projected on a screen by a projection device such as a
projector, a speaker is installed beside the screen, etc., and the image on the screen is viewed
while listening to the sound emitted from the speaker.
[0003]
However, as the size of the screen has increased, the distance between the image projected on
the screen and the speaker has increased, and the difference between the image and the sound
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1
emitted from the speaker has become unnatural to the viewer.
In particular, the image in the central portion of the screen has a large deviation from the sound
emitted from the speaker and the unnaturalness is felt strongly.
[0004]
In order to solve such a problem, a so-called screen speaker in which a voice coil is provided on
the back side of the screen and the screen is directly driven as a diaphragm to emit sound from
the screen surface is disclosed, for example, in Patent Document 1 Has been proposed.
Such a screen speaker comprises a screen part and a framework for supporting the screen part.
In Patent Document 1, a screen is supported by a frame which is a frame.
[0005]
And an aluminum plate is used for a screen from the lightness and the appropriateness as a
diaphragm, and woods, such as an ash material, are used as a framework.
[0006]
Japanese Patent Application Laid-Open No. 2005-64932 (see abstract etc.)
[0007]
When the applicant undertook the development of this type of screen speaker, it was found that
the problem of deformation of the speaker occurred with the passage of time.
As a result of conducting experiments to investigate the cause of this problem, the following was
found.
Screen speakers are sized to exceed 50 inches, or even 100 inches, due to the need to magnify
the image onto the screen. Therefore, even if the difference in expansion due to thermal
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2
expansion between the framework supporting the screen and the screen is small, the effect is
large on a large screen, and as a result, the screen is deformed.
[0008]
Specifically, in the following cases, it was found that a difference in expansion occurs between
the screen and the framework, and the screen is deformed.
[0009]
That is, if there is a large difference between the environmental temperature of the work site
when manufacturing the screen speaker, which assembles the screen into the framework, and the
environmental temperature when the screen speaker is installed in the room actually used, the
screen and the framework In the meantime, expansion difference occurs due to thermal
expansion, and the screen is deformed.
[0010]
The following experiment was conducted to verify this fact.
That is, when the screen speaker manufactured under the environmental temperature of a cold
work site in winter was left in a room set to normal temperature for several hours to about 24
hours, it could be experimentally confirmed that the screen was deformed.
In addition, when the deformation is large, there is a possibility that the bonding portion for
fixing the screen and the framework may be peeled off.
[0011]
In particular, it has been found that the above-mentioned problem is remarkable when a plurality
of screen speakers are connected together in order to construct a large screen.
[0012]
That is, when a large screen speaker is configured by connecting a plurality of screen speakers
and installed at the wall of a room, the temperature difference between the corner of the wall and
the center or the temperature difference between the floor and ceiling of the wall It was found
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3
that thermal expansion difference occurs in the screen speaker in the vertical direction or in the
horizontal direction, and the screen speaker is deformed.
[0013]
In addition, it has been found that, since the framework is made of wood, there arises a problem
that the framework itself is deformed due to a humidity difference due to a seasonal difference or
the like.
[0014]
Also, when a large input is applied to the screen speaker for a long time, the voice coil is
overheated and as a result, the screen is heated.
Since the screen is an aluminum plate, it is excellent in heat dissipation, but if a large input is
applied for a long time, it is stored on the screen and the screen expands, which may cause
deformation of the screen to exceed the practically acceptable range. There is.
[0015]
Specifically, the voice coil may be misaligned with respect to the gap of the magnetic circuit, and
the voice coil may come into contact with the gap during driving to generate an abnormal sound.
The magnetic gap in which the voice coil is placed is generally 0.2 mm to 0.25 mm or so, with
the yoke constituting the magnetic gap, the inner diameter of the voice coil bobbin, or the
clearance between the plate and the outer diameter of the voice coil. Since the voice coil is
misaligned with respect to the gap of the magnetic circuit, an abnormal sound is generated.
[0016]
Then, an object of this invention is to provide the screen speaker which suppressed the
deformation ¦ transformation of the screen speaker.
[0017]
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In order to solve the above problems, the present invention makes the thermal expansion
coefficients of the screen and the support that supports the screen the same or substantially the
same.
[0018]
In another invention, the screen and the support are made of metal.
[0019]
In another invention, the metal constituting the screen and the support is made of aluminum or
an aluminum alloy.
[0020]
In another invention, the shape of the outer periphery of the screen and the shape of the outer
periphery of the support are the same.
[0021]
In another invention, the outer peripheral frame constituting the support has a substantially Ushaped cross-sectional shape, and the thickness of the plate constituting the outer peripheral
frame is three or more times and 10 times the thickness of the screen It shall be the following.
[0022]
In another invention, the width dimension of the bonding portion for fixing the screen and the
outer peripheral frame of the support is equal to or more than 15 times the thickness of the plate
constituting the outer peripheral frame.
[0023]
In another embodiment of the present invention, the support is a pair of housings for holding the
magnetic circuit housing from at least one side of the magnetic circuit housing in the upper and
lower direction or in the left and right direction, with respect to the support A magnetic circuit
housing holding frame to be supported shall be provided.
[0024]
In another aspect of the present invention, the magnetic circuit housing holding frame is in close
contact with the magnetic circuit housing at a portion for holding the magnetic circuit housing.
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[0025]
In the other invention, the magnetic circuit housing holding frame is configured to have a plate
perpendicular to each other, and the thickness of the plate is equal to or more than 4 times the
thickness of the plate constituting the outer frame. The width dimension of the plate is 5 times or
more and 20 times or less the thickness of the plate constituting the outer peripheral frame.
[0026]
According to another aspect of the invention, in the L-metal fitting for fixing the constituent
members of the support to each other, a screw hole in which a screw is screwed is formed on one
side and a screw is screwed on the other side. It is assumed that a screw insertion hole which
passes through is formed.
[0027]
In another invention, in the L metal fitting for fixing the constituent members of the support to
each other, the thickness of the plate at each side constituting the L metal is equal to or more
than the thickness of the plate forming the outer peripheral frame, It shall be 4 times or less, and
the length of each side shall be 10 times or more and 20 times or less of the thickness of the
plate which constitutes a perimeter frame.
[0028]
In another invention, the L fitting is formed of the same material as the support.
[0029]
In another invention, an acrylic adhesive is used to bond the members constituting the screen
speaker.
[0030]
In another invention, a plurality of screen speakers are connected to each other by L fittings.
[0031]
A screen speaker 10 according to an embodiment of the present invention will be described with
reference to FIGS.
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[0032]
As shown in FIGS. 1 and 2, the screen speaker 10 is mounted with a screen S formed of an
aluminum material on the front surface side, and a back plate BB is mounted on the back surface
side on the opposite side.
[0033]
The external dimensions of the screen speaker 10 are configured such that the width L is 1680
mm, the height H is 895 mm, the thickness W is 36 mm (including the thickness of the back
plate BB), and the aspect ratio is 9:16. A so-called 75-inch screen size is shown as an example.
The thickness WS of the screen S is 0.8 mm.
Then, the screen speaker 10 is used by being installed on a wall surface or the like with the
longitudinal direction (width direction) in the lateral direction and the short direction (height
direction) in the vertical direction.
In the following description, the longitudinal direction will be described as the left-right direction,
and the short direction will be the up-down direction.
[0034]
The structure of the support body 20 which comprises the screen speaker 10 in FIG. 3 is shown.
The support 20 shown in FIG. 3 is shown such that the front side of the paper surface is the back
side of the screen speaker 10 and the back side of the paper surface is the front side of the
screen speaker 10.
[0035]
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The support 20 has a frame structure, and includes an outer peripheral frame 21, an inner frame
22, and a holder 24.
The outer peripheral frame 21 has a rectangular shape as shown in FIG. 4, and the outer
dimensions thereof are 1680 mm in the lateral direction and 895 mm in the vertical direction
according to the external dimensions of the screen speaker 10.
[0036]
The outer peripheral frame 21 has two housings 21L which constitute upper and lower frames of
the outer peripheral frame 21 and two housings 21S which constitute left and right frames.
The casing 21L and the casing 21S are fixed to each other via the L metal fitting 23 at the four
corners of the frame.
[0037]
The housings 21L and 21S are made of an aluminum material, and the shape of the cross section
thereof is substantially U-shaped as shown in FIG. 5 which is an enlarged view of a part A
surrounded by a two-dot chain line in FIG.
That is, the casing 21L has a bottom plate portion 21Lb and side plate portions 21Ls on both
sides of the bottom plate portion 21Lb, and is formed in a groove shape in which the side facing
the bottom plate portion 21Lb is open.
Further, the casing 21S also has a bottom plate portion 21Sb and side plate portions 21Ss on
both sides of the bottom plate portion 21Sb, and is of a groove type in which the side facing the
bottom plate portion 21Sb is opened.
The housings 21L and 21S have the bottom plates 21Lb and 21Sb disposed on the outer
peripheral side, and are disposed with the side of the opening facing the inside of the frame.
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The housings 21L and 21S have a width Wb of 30 mm outside the bottom plates 21Lb and 21Sb,
and a width Ws outside the side plates 21Ls and 21Ss of 25 mm.
Moreover, the thickness of the board which comprises bottom plate part 21Lb, 21Sb and side
plate part 21Ls, 21Ss is 3 mm.
That is, while the thickness WS of the screen S is 0.8 mm, the thickness of the bottom plate
portions 21Lb and 21Sb and the side plate portions 21Ls and 21Ss is 3.75 times as thick.
The casings 21L and 21S are formed by extrusion molding.
The casings 21L and 21S constituting the outer peripheral frame 21 are substantially U-shaped
in cross section, and the thickness of the plate is at least 3 times and at most 10 times the
thickness of the screen S (3 in this embodiment) By setting .75, the strength of the support 20
can be secured without affecting the sound quality.
[0038]
When the ends of the casings 21L and 21S are aligned with each other, the casings 21L and 21S
are connected at right angles to each other so that the outer frame 21 has a rectangular shape as
shown in FIG. The slope is 45 degrees from the side of 21Sb toward the side of the opening.
The housing 21L and the housing 21S are connected to each other at a right angle with the end
portions formed on the 45 ° inclined surface, and in the corner part where the housing 21L and
the housing 21S are connected from the groove side The L metal fitting 23 is aligned, and the
housing 21L and the housing 21S are fixed to each other by the L metal fitting 23.
The L metal fitting 23 and the housings 21L and 21S are fixed to the screw S.
[0039]
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9
With reference to (A) and (B) of FIG. 5, the configuration of the L metal fitting 23 and the
structure for fixing the housing 21L and the housing 21S by the L metal fitting 23 will be
described.
FIG. 5A is an assembly view of a portion where the housing 21L and the housing 21S are fixed by
the L metal fitting 23.
FIG. 5B is a cross-sectional view of the portion A of FIG. FIGS. 5A and 5B show one corner of the
four corners of the outer peripheral frame 21. The other three corners have the same
configuration.
[0040]
Two screw insertion holes 21Lh and 21Sh for passing the screws S are formed in the housings
21L and 21S, respectively. A hole 21Lh 'is formed between the two screw insertion holes 21Lh.
Further, a hole 21Sh 'is formed between the two screw insertion holes 21Sh.
[0041]
The screw insertion holes 21Lh, the holes 21Lh 'and the screw insertion holes 21Lh are formed
such that their centers have a gap of 15 mm, and the screw insertion holes 21Lh located on the
corner of the outer peripheral frame 20 have their centers from the corners It is formed at a
position of 15 mm. Further, the screw insertion holes 21Sh, the holes 21Sh 'and the screw
insertion holes 21Sh are also formed with their centers being separated by a distance of 15 mm,
and the screw insertion holes 21Sh located on the corner of the outer peripheral frame 20 are 15
mm from the corner It is formed in position. As the screw S, a so-called M4 size countersunk
screw is used, and the hole diameter of the screw insertion holes 21Lh and 21Sh is an inner
diameter hole through which the M4 size screw S can be inserted. The screw insertion holes
21Lh and 21Sh are countersunk holes in which the hole diameter narrows inward corresponding
to the screw S of the countersunk screw. That is, the screw head (the rear end of the screw) of
the screw S fits into the countersunk hole, and the screw head (the rear end of the screw) does
not protrude from the bottom plate portions 21Lb and 21Sb. The central holes 21Lh 'and 21Sh'
are holes each having an inner diameter of 6 mm.
11-05-2019
10
[0042]
On the other hand, in the L metal fitting 23, two screw insertion holes 23h having a diameter of
4.5 mm are formed in one side portion 23A so that the screw S can be inserted without being
screwed. A hole 23 h ′ of 6 mm in diameter is formed between the two screw insertion holes 23
h. Further, in the other side portion 23B of the L metal fitting 23, two screw holes 23hm in which
the screw S is screwed are formed. A hole 23 h ′ of 6 mm in diameter is formed between the
two screw holes 23 hm.
[0043]
The two screw insertion holes 23h on one side 23A of the L metal fitting 23 and the holes 23h
'therebetween, and the two screw holes 23hm on the other side 23B and the holes 23h'
therebetween are respectively as follows: Is formed. That is, with the L metal fitting 23 facing the
outside of the L character toward the side of the right angle where the case 21L and the case 21S
intersect, the side 23A is along the case 21L and the side 23B is along the case 21S. The screw
insertion hole 23h is located at a position facing the screw insertion hole 21Lh on the 21L side,
and the hole 23h 'is formed at a position facing the hole 21Lh'. Further, the screw hole 23hm is
located at a position facing the screw insertion hole 21Sh on the side of the rod 21S, and the hole
23h 'is located at a position facing the hole 21Sh'.
[0044]
Since the screw S is a M4 size screw, the screw hole 23hm is also a so-called M4 size screw hole.
Therefore, the housing 21S and the L metal fitting 23 are fixed to each other by screwing the
screw S into the screw hole 23hm. Further, the housing 21L and the L metal fitting 23 fix the
housing 21L and the L metal fitting 23 to each other by screwing a nut N on the tip end side of
the screw S passed through the screw insertion hole 21Lh and the screw insertion hole 23h. The
nut N is a so-called M4 nut which is screwed to the screw S. By the way, in the screw S, the screw
length on the side where the nut N is screwed is 13 mm. Further, without screwing the nut N, the
screw S screwed into the screw hole 23hm of the L metal fitting 23 has a screw length of 10 mm.
In the following description, although the screw length of the screw S is not particularly
described, the screw length is 13 mm for screwing to the nut N, and 10 mm for screwing to the
screw hole 23hm. .
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11
[0045]
As described above, the outer peripheral frame 21 is configured as a frame by fixing the case 21
</ b> L and the case 21 </ b> S to each other by the L metal fitting 23.
[0046]
The L metal fitting 23 is made of an aluminum material, and the length of each side portion 23A,
23B is 50 mm, and the width thereof may be disposed inside the box-like members 21L, 21S
having a U-shaped cross section, that is, in the groove It is 23.8 mm so that it can be done.
The thickness of the plate of the side portions 23A and 23B is 6 mm. That is, this thickness is
twice the thickness of the bottom plate portions 21Lb, 21Sb, etc. constituting the housings 21L,
21S. Further, the length of the side portions 23A, 23B is about 16.6 times the thickness (here, 3
mm) of the bottom plate portions 21Lb, 21Sb, etc. constituting the casings 21L, 21S. When the
housings 21L and 21S and the L metal fitting 23 are fixed, it is preferable that the fixing using an
adhesive is further used in combination and the fixing be performed more firmly. The L metal
fitting 23 sets the thickness of each side portion 23A, 23B to be equal to or more than 4 times (2
times in this embodiment) the thickness of the casings 21L, 21S constituting the outer peripheral
frame 21, and each side The rigidity of the support 20 is sufficiently ensured by setting the
length of the portions 23A and 23B to 10 times or more and 20 times or less (about 16.6 times
in this embodiment) of the thickness of the housings 21L and 21S. can do.
[0047]
As shown in FIG. 6, the inner frame 22 is stretched over the upper and lower housings 21 L at
the positions where the outer frame 21 is divided into three equally in the left-right direction,
and the housing 21 L and the inner frames 22 mutually It is fixed. The inner frame 22 is
composed of two housings 22A.
[0048]
As shown in FIG. 7, which is an enlarged view of a portion B surrounded by the two-dot chain line
in FIG. 3, the housing 22A has a substantially U-shaped cross section. That is, the housing 22A
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has a bottom plate portion 22Ab and side plates 22As1 and 22As2 on both sides of the bottom
plate portion 22Ab, and has a grooved shape having an opening on the side facing the bottom
plate portion 22Ab. The side plate portion 22As2 is configured to be narrower than the side plate
portion 22As1. The outer width of the bottom surface portion 22Ab is 30 mm, the outer width of
the side plate portion 22As1 is 25 mm, and the outer width of the side plate portion 22As2 is 8
mm. The thickness of each of the bottom portion 22Ab, the side plate portion 22As1, and the
side plate portion 22As2 is 3 mm. The housing 22A is formed by extrusion of an aluminum
material.
[0049]
The two housings 22A configured in this way are bridged over the upper and lower housings
21L of the outer frame 21, with the side plates 22As1 facing the back side and the outer surfaces
of the bottoms 22Ab being back to back. ing. Then, the two housings 22A are fixed to the upper
and lower housings 21L via the L metal fittings 23 such that the bottom portions 22Ab and 22Ab
back-to-back are sandwiched by the L metal fittings 23 from both sides.
[0050]
The structure which fixes 21 L of housings and housing 22A, 22A with L metal fitting 23 is
demonstrated, referring (A) and (B) of FIG. FIG. 7A is an assembly diagram of a portion for fixing
the housing 21L and the housings 22A and 22A to the L metal fitting 23. FIG. 7B is a crosssectional view of the portion B in FIG.
[0051]
Of the two L fittings 23, one L fitting 23 (right side in FIG. 7) has the side 23A along the inside of
the bottom plate 21Lb of the casing 21L, and the side 23B is one casing 22A. It arranges along
the inside of bottom plate part 22Ab of this. Further, for the other L metal fitting 23 (left side in
FIG. 7), the side portion 23A side is along the inside of the bottom plate portion 22Ab of the
housing 22A, and the side portion 23B is inside the bottom plate portion 21Lb of the other
housing 21L. Arrange along the
[0052]
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13
On the side of the housing 21L, screw insertion holes 21Lh are formed at a position where the
screw insertion holes 23h of one L metal fitting 23 face each other and a position where the
screw holes 23hm of the other L metal fitting 23 face each other. Further, a hole 21Lh 'is formed
at a position facing the holes 23h' of the two L fittings 23 on the side of the flange 21L.
Therefore, in one L metal fitting 23, the nut N is screwed into the screw S passed through the
screw insertion hole 21Lh of the housing 21L and the screw insertion hole 23h of the L metal
fitting 23 from the side of the housing 21L. Are fixed to each other. Further, the other L metal
fitting 23 is fixed to the housing 21L by the screw S screwed into the screw hole 23hm of the L
metal fitting 23 through the screw insertion hole 21Lh from the side of the housing 21L.
[0053]
The side portion 23B of one L metal fitting 23 (right side in FIG. 7) of the two L metal fittings 23
of the two bottom plate parts 22Ab and 22Ab of the inner frame 22 attached to the housing 21L
as described above In a portion sandwiched by the side portion 23A on the left side in FIG. 7, the
screw insertion hole 23h of the side portion 23A of the other L metal fitting 23 passes through
the screw hole 23hm of the side portion 23B of the one L metal fitting 23 A screw insertion hole
22Ah of 4.5 mm in diameter is formed. A M4 × 20 mm hexagonal socket screw Sr1 is passed
through the screw insertion hole 23h of the side 23B of the L metal fitting 23 through the screw
insertion hole 22Ah, and screwed into the screw hole 23hm of the side 23A of the screw L metal
fitting 23. Thus, the housings 22A, 22A are fixed to the L metal fitting 23.
[0054]
As described above, by fixing the housings 22A and 22A to the housing 21L of the outer frame
21, the outer frame 21 is reinforced and the rigidity is enhanced. The screen speaker 10 also
functions as a partition for a cavity that constitutes each of the center, left, and right output
channels. That is, the sitter channel, the left channel, and the right channel can each constitute an
independent cavity. And since the partition which comprises a cavity backs up the baseplate part
22Ab of two housings 22A, it becomes a double partition and the thickness is 6 mm. Thus, the
mixing of sounds between the cavities can be reduced.
[0055]
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When the housing 21L and the L metal fitting 23, and the housings 22A and 22A and the L metal
fitting 23 are fixed, in addition to the fixing using the screw S and the screw Sr1, the fixing using
an adhesive is used together to fix more firmly. Is preferred. As an adhesive used for this
adhesion, an acrylic adhesive is used, and particularly preferably a two-component mixed acrylic
adhesive is used.
[0056]
As shown in FIGS. 6 and 7, the housings 22A and 22A have side plates 22As1 and 22As2 shorter
than the bottom plate 22Ab in the vertical direction at both ends, and both ends of the bottom
plate 22Ab project. ing. That is, the projection 22Ab 'in which the bottom plate portion 22Ab
protrudes from the side plate portions 22As1 and 22s2 is formed in the flange 22A.
[0057]
In other words, the protruding portion 22Ab 'is designed to enter the groove portion of the rod
21L. Therefore, the side portions 23A and 23B of the L metal fitting 23 can be along the bottom
plate portion 22Ab over the entire surface, and the fixation with the L metal fitting 23 is reliably
performed.
[0058]
Next, with reference to FIGS. 8, 9 and 10, the structure of the holding frame 24 as a magnetic
circuit housing holding member configured to support the magnetic circuit housing H for
mounting the magnetic circuit on the support 20 while configuring the support 20. While
explaining.
[0059]
As shown in FIG. 9, the magnetic circuit housing H presents a rectangular parallelepiped in a
square in plan view.
[0060]
As shown in FIG. 8, the holding frame 24 includes two rods 25 arranged in parallel, and a total of
four rods 26 arranged two on each side of the two rods 25 in parallel. Are combined in the form
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of a well.
[0061]
The housing 25 has a flat plate portion 25A and a vertical plate portion 25B provided at right
angles along the center of the flat plate portion 25A.
That is, the cross section of the housing 25 is configured to be substantially T-shaped.
The housings 25 are respectively provided on the left and right of the magnetic circuit housing
H.
[0062]
On the left and right side surfaces of the magnetic circuit housing H, screw holes Hhm in which
screws S are screwed are provided at two places.
Further, in the vertical plate portion 25B of the housing 25 disposed on the left and right of the
magnetic circuit housing H, a screw insertion hole 25Bh having a diameter of 4.5 mm through
which the screw S passes is formed at a position corresponding to the screw hole Hhm. Then, the
magnetic circuit housing H is fixed to the housing 25 by screwing the screw S into the screw
insertion hole 25Bh and screwing it into the screw hole Hhm of the magnetic circuit housing H.
The left and right side surfaces of the magnetic circuit housing H and the flat plate portion 25B
are planar to each other. Therefore, the magnetic circuit housing H is fixed in a state in which the
left and right side surfaces are in close contact with the vertical plate portion 25B.
[0063]
The flat plate portion 25A of each housing 25 is formed with a recessed portion 25C having a
depth extending from the side edge toward the inner side from the side edge in accordance with
the shape of the magnetic circuit housing H at the central portion. The recessed portion 25C is
formed in a shape in which the side surface portion is in close contact with the vertical plate
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portion 25B when the left and right side surface portions of the magnetic circuit housing H are
fitted into the recessed portion 25C. Therefore, the magnetic circuit housing H can be attached to
the housing 25 with a portion thereof fitted in the recess 25C and the flat portion of the
magnetic circuit housing H and the flat portion 25A of the housing 25 being flush.
[0064]
The housing 25 is formed by extrusion of an aluminum material. The width of the flat plate
portion 25A is 23 mm, and the width of the vertical plate portion 25B is 25 mm. That is, the
width of the flat portion 25A is about 7.6 times the thickness 3 mm of the housings 21L and 21S,
and the width of the vertical plate 25B is about 8.3 times the thickness 3 mm of the housings
21L and 21S. It has become. Furthermore, the thickness of the flat plate portion 25A and the
vertical plate portion 25B is 3 mm, which is the same as that of the housings 21L and 21S. The
length is 88.8 mm so as to be bridged over the upper and lower housings 21L. The thickness of
the flat plate portion 25A and the vertical plate portion 25B is equal to or more than the plate
thickness of the casings 21L and 21S constituting the outer peripheral frame 21 and four times
or less (the same in the present embodiment). The width of the portion 25B is not less than 5
times and not more than 20 times the plate thickness of the casings 21L and 21S (about 7.6
times for the flat plate portion 25A and about 8.3 times for the flat plate portion 25B in this
embodiment) The weight of the screen speaker 10 can be reduced, and the rigidity of the support
20 can be secured. The flat plate portion 25A and the vertical plate portion 25B are orthogonal
to each other, and the cross section of the casing 25 is substantially T-shaped, but the plate
members are mutually L-shaped or I-shaped. It may be configured to be orthogonal.
[0065]
As described above, two casings 26 are provided on the upper and lower sides of the two casings
25 that hold the magnetic circuit housing H inside. Similarly to the case 25, the case 26 is
substantially T-shaped in cross section, and has a flat plate portion 26A and a vertical plate
portion 26B provided at right angles along the center of the flat plate portion 26A.
[0066]
The housing 26 is fixed to the housing 25 by two L fittings 27 disposed on both sides of the
vertical plate portion 25B of the housing 25 as shown in FIG. The L metal fitting 27 disposed on
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the side of the housing 26 has a side portion 27B in which a screw hole 27hm in which the screw
S is screwed is formed along a vertical plate portion 26B of the housing 26 and a screw insertion
hole through which the screw S is inserted. The side portion 27A where the 27h is formed is
disposed along the vertical plate portion 25B of the housing 25. Further, in the L metal fitting 27
disposed on both sides of the vertical plate portion 25B of the housing 25 with respect to the L
metal fitting 27, that is, the L metal fitting 27 disposed on the magnetic circuit housing H side,
screw holes 27hm are formed. The side portion 27B is arranged along the vertical plate portion
25B of the housing 25, and the side portion 27A where the screw insertion hole 27h is formed is
arranged along the side surface of the magnetic circuit housing H.
[0067]
Then, the housing 26 and the L metal fitting 27 along the vertical plate portion 26B of the
housing 26 are fixed by the screw S. That is, in the vertical plate portion 26B, a screw insertion
hole of 4.5 mm in diameter (not shown) is formed at a position corresponding to the screw hole
27hm, and the screw S is screwed into the screw hole 27hm through the screw insertion hole.
The housing 26 and the L metal fitting 27 are fixed.
[0068]
Further, as described above, the screw S is passed through the screw insertion hole 27h of the L
metal fitting 27 fixed to the housing 26 to the L metal fitting 27 side along the magnetic circuit
housing H, and the L metal fitting 27 on the magnetic circuit housing H side Screw into screw
holes 27 hm. Thereby, the housing 26 is fixed to the housing 25. 4. Insert the screw S into the
screw hole 27 hm of the L metal fitting 27 along the magnetic circuit housing H from the screw
insertion hole 27 h of the L metal fitting 27 along the housing 26 in the vertical plate portion 25
B of the housing 25. A screw insertion hole of 5 mm in diameter is formed.
[0069]
In FIG. 10, only the two casings 26 on one side of the casing 25 are shown, but the casing 26 is
similarly attached to the casing 25 on the other side. As described above, the four housings 26
are fixed to the housing 25.
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18
[0070]
Screw holes Hhm are formed on the surface of the magnetic circuit housing H along the L metal
fitting 27, that is, the upper and lower surfaces, at positions corresponding to the screw insertion
holes 27 h of the L metal fitting 27. Then, the magnetic circuit housing H and the L metal fitting
27 are fixed by the screw S. That is, in the magnetic circuit housing H, the side surface in the left
and right direction is fixed to the vertical plate portion 25B (the housing 25) by the screw S, and
the side surface in the vertical direction is fixed to the housing 25 by the L fitting 27. .
[0071]
As described above, the magnetic circuit housing H is held by the case 25 and the case 26 at the
central portion of the holding frame 24 assembled in the shape of a parallel cross. In addition, as
described above, by fixing the left and right surfaces of the magnetic circuit housing H in a state
in which the left and right surfaces of the magnetic circuit housing H are in close contact with
the vertical plate portion 25B of the housing 25, holding of the magnetic circuit housing H to the
holding frame 24 becomes reliable. Abnormal vibration can be prevented and sound quality can
be improved. Further, it is possible to improve the heat radiation effect of dissipating the heat
from the magnetic circuit to the housing 25 side at the time of large input.
[0072]
The holding frame 24 for holding the magnetic circuit housing H is disposed in each of the three
cavities divided by the inner frame 22 as shown in FIG. 3 and fixed to the support 20 by the L
metal fitting 23. That is, the housing 25 of each holding frame 24 is fixed to the upper and lower
housings 21 L by the L fitting 23 using the screw S. Also, the left and right housings 26 of the
holding frames 24 disposed in the left and right cavities are fixed using the screw S with the L
metal fitting 23 with the one housing 26 on the housing 21S, the other housing 26 on the inner
frame 22 Be done. The housing 26 of the central holding frame 24 is fixed to the inner frame 22
by the L metal fitting 23 using a screw S.
[0073]
As shown in FIG. 8, in the case 25, the flat plate portion 25 </ b> A is formed shorter than the
11-05-2019
19
vertical plate portion 25 </ b> B in the vertical direction at both ends. In other words, each rod
25 is formed with a projection 25B 'in which the vertical plate 25B protrudes from the flat plate
25A. Similarly, the flat plate portion 26A is formed shorter than the vertical plate portion 26B.
That is, each of the flanges 26 is formed with a projection 26B 'in which the vertical plate 26B
protrudes from the flat plate 26A.
[0074]
In other words, the protrusion 25B 'is designed to enter the groove of the rod 21L. Therefore, the
side portions 23A and 23B of the L metal fitting 23 can be extended along the entire surface
along the vertical plate portion 25B, and the fixation with the L metal fitting 23 is surely
performed. In addition, the protruding portion 26B 'is designed to enter into the groove portion
of the cage 22 or the cage 21S. Therefore, the side portions 23A and 23B of the L metal fitting
23 can be along the vertical plate 26B over the entire surface, and the fixation with the L metal
fitting 23 is reliably performed. Further, the protrusion 26B 'on the side of the rod 25 is adapted
to enter the groove of the rod 25. Therefore, the side portions 27A and 27B of the L metal fitting
27 can be along the vertical plate portion 26B over the entire surface, and the fixation with the L
metal fitting 27 is surely performed.
[0075]
The L metal fitting 27 is made of an aluminum material in the same manner as the L metal fitting
23, and the length of each side 27A, 27B is formed to be 50 mm the same as the L metal fitting
23. However, the width is formed as narrow as 16 mm. Also, the thickness is formed to be 6 mm,
which is the same as the L metal fitting 23. That is, this thickness is twice the thickness of the
bottom plate portions 21Lb, 21Sb, etc. constituting the housings 21L, 21S. Further, the length of
the side portions 27A, 27B is about eight times the thickness (here, 3 mm) of the bottom plate
portions 21Lb, 21Sb, etc. constituting the housings 21L, 21S. The L metal fitting 27 has the
thickness of each side 27A, 27B equal to or more than 4 times (2 times in this embodiment) the
thickness of the casings 21L, 21S constituting the outer peripheral frame 21, and each side The
rigidity of the support 20 is sufficiently secured by setting the length of the portions 27A and
27B to 10 times or more and 20 times or less (about 16.6 times in the present embodiment) of
the thickness of the housings 21L and 21S. can do.
[0076]
11-05-2019
20
In addition, in fixing the holding frame 24 and the outer peripheral frame 21 (body 21L, housing
21S) or the holding frame 24 and the inner frame 22 (body 22A), the fixing portion with the L
metal fitting 23 is fixed by the screw S. It is preferable to use fixing with an adhesive together
and to fix more firmly. As an adhesive used for this adhesion, an acrylic adhesive is used, and
particularly preferably a two-component mixed acrylic adhesive is used.
[0077]
The holding frame 24 has a function of enhancing the rigidity of the outer peripheral frame 21 in
accordance with the support of the magnetic circuit housing H with respect to the outer
peripheral frame 21 and the inner frame 22. In other words, the housing 25 is fixed by the L
metal fitting 23 to the upper and lower housings 21 L and fixed, and the housing 26 is fixed by
the L metal fitting 23 to the left and right housings 21 S or the inner frame 22. The rigidity of the
outer peripheral frame 21 is improved.
[0078]
In order to fix the magnetic circuit housing H to the holding frame 24 with the L metal fitting 27,
it is preferable not to use the fixing with the adhesive in combination in consideration of
maintenance properties so that the magnetic circuit housing H can be easily removed.
[0079]
As described above, with the inner frame 22 attached to the outer circumferential frame 21 and
the holding frame 24 holding the magnetic circuit housing H attached, the screen S and the back
plate BB are attached to the support 20 as shown in FIG. .
The dimensions of the outer periphery of the screen S are the same as those of the outer
peripheral frame 21. Then, in the attachment of the screen S to the support 20, an adhesive is
applied to the front side (the screen S attachment side) of the outer peripheral frame 21 and the
inner frame 22 and the screen S is adhered to the outer peripheral frame 21 and the inner frame
22 It does by fixing. As the adhesive, an acrylic adhesive is used, and particularly preferably a
two-component mixed acrylic adhesive is used.
11-05-2019
21
[0080]
In the mounting work of the screen S on the support 20, a surface plate larger than the outer
circumference of the support 20, ie, the outer circumference of the outer frame 21, is prepared,
and is performed on this surface plate. First, the positioning block is placed on the surface plate,
and the screen S is placed along this block. Then, an adhesive is applied to a portion where the
outer peripheral frame 21 (the casings 21L and 21S) of the screen S abuts and a portion where
the inner frame 22 (the casing 22A) abuts. Furthermore, an adhesive is applied also to the front
side of the outer peripheral frame 21 (the housings 21L and 21S) and the inner frame 22 (the
housing 22A). Next, the support 20 is placed on the screen S while being positioned along the
positioning block so that the portion coated with the adhesive on the screen S and the portion
coated with the adhesive of the support 20 overlap. Then, in order to ensure adhesion, the
adhesion portion is pressed, and this state is maintained for about 20 minutes. The
environmental temperature at this time is approximately room temperature (24 ° C. to 25 ° C.).
When the adhesive cures and reaches the required strength, the pressing force is released. The
bonding width between the outer peripheral frame 21 and the screen S, that is, the bonding
margin is 25 mm which is the width of the side plate portions 21Ls and 21Ss of the outer
peripheral frame 21. That is, the thickness of the side plate portions 21Ls and 21Ss is about 8.3
times that of 3 mm. Since the shape of the outer periphery of the screen S and the shape of the
outer periphery of the support 20 are the same, the bonding margin for bonding the screen S to
the outer peripheral frame 21 is taken the full width of the side plate portions 21Ls and 21Ss of
the outer peripheral frame 21. And securement of the screen S to the support 20 can be ensured.
The width dimension of the bonding portion for fixing the screen S and the outer peripheral
frame 21, that is, the bonding margin between the screen S and the outer peripheral frame 21, is
equal to or more than 15 times the thickness of the plate of the outer peripheral frame 21 (this
embodiment Then, it is about 8.3 times). By doing this, the adhesive strength between the screen
S and the outer peripheral frame 21 can be sufficiently secured.
[0081]
Then, a voice coil and a magnetic circuit (not shown) are incorporated in the magnetic circuit
housing H. Then, the back plate BB is attached to the back side of the support 20. A plurality of
screw insertion holes BBh are formed in a portion facing the outer peripheral frame 21, the inner
frame 22, and the holding frame 24 of the back plate BB. Further, on the side of the outer
peripheral frame 21, the inner frame 22 and the holding frame 24, screw holes Bhm in which
screws passed through the screw insertion holes BBh are screwed are formed. That is, the back
plate BB is screwed and fixed to the housings 21L and 21S, the inner frame 22 and the holding
frame 24. The back plate BB is fixed to a plurality of places by the casings 21L and 21S, the inner
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22
frame 22 and the holding frame 24, so that the rigidity of the screen speaker 10 can be
enhanced.
[0082]
Next, as shown in FIG. 11A, the screen speaker 10 configured as described above is a 150-inch
screen speaker with a total of four arranged side by side so that the long side and the short side
extend vertically and horizontally. The structure of 10M will be described.
[0083]
When four screen speakers M1, M2, M3 and M4 are arranged such that the case 21L and the
case 21S are adjacent to each other as shown in FIG. 11A, on both sides of the adjacent case 21L
and the case 21S. The L metal fitting 23 is disposed at several places.
That is, at the adjacent corners of the screen speakers M1, M2, M3 and M4, the L metal fittings
23 for fixing the housings 21L and 21S of the screen speakers M1, M2, M3 and M4 are adjacent
housings 21L or adjacent It arranges on both sides of the housing 21S. Further, also at a portion
where the inner frame 22 and the holding frame 24 of the housings 21L and 21S are fixed, the L
metal fitting 23 is disposed with the adjacent housing 21L or the adjacent housing 21S
interposed therebetween. In (B) of FIG. 11, in the central portion of the screen speaker 10M
having a large screen size, in which the corner portions of the four screen speakers M1, M2, M3
and M4 gather, the adjacent housing 21L and the L metal fitting 23 sandwiching the same The
appearance of arrangement ¦ positioning of the L metal fitting 23 which pinches ¦ interposes
adjacent housing 21S and this is shown.
[0084]
In the adjacent housing 21L and the L metal fitting 23 sandwiching this, the one L metal fitting
23 leads from the one L metal fitting 23 to the other L metal fitting 23 through the hole 23h 'of
the L metal fitting 23 and the hole 21Lh' of the housing 21L. The screw insertion hole H1 is
formed. Similarly, in the adjacent housing 21S and the L metal fitting 23 sandwiching this, the
other L metal fitting 23 passes from the one L metal fitting 23 through the adjacent housing 21S
by the hole 23h 'of the L metal fitting 23 and the hole 21Sh' of the housing 21S. A screw
insertion hole H2 communicating with the other is formed.
11-05-2019
23
[0085]
Then, the M5 × 25 mm hexagonal socket screw Sr2 is inserted into the screw insertion hole H1
and the adjacent housing 21L is tightened together with the L fitting 23 disposed with the
adjacent housing 21L interposed therebetween by the nut N of M5. Further, through the M5 ×
25 mm hexagonal socket screw Sr2 in the screw insertion hole H2, the adjacent housing 21S is
tightened together with the L metal fitting 23 disposed with the adjacent housing 21S interposed,
by the nut N of M5. As described above, the four screen speakers M1, M2, M3, and M4 are
integrally fixed to configure the screen speaker 10M having a large screen.
[0086]
The four screen speakers M1, M2, M3 and M4 are configured to be fastened via the L metal
fitting 23. Therefore, the fastening portion has a structure in which the plate thickness of the side
portions 23A and 23B of the L metal fitting 23 is added, and the structure is extremely strong.
That is, even if the fastening force by the hexagonal socket screw Sr2 is increased, the frames
21L and 21S can be fixed to each other extremely firmly without deformation.
[0087]
In the embodiment described above, the screen S and the support frame 20 are formed of an
aluminum material which is the same material. Thereby, since the thermal expansion coefficients
of the screen S and the support 20 become the same, it is possible to reduce the deformation due
to the expansion difference between the screen S and the support 20 due to the temperature
change, and suppress the deformation of the screen speaker 10. Can do. Further, by thus forming
the screen S and the support frame 20 from metal, it is possible to reduce the expansion
difference due to the humidity change between the screen S and the support 20, and to further
suppress the deformation of the screen speaker 10. Can. Furthermore, since the L metal fitting
23 and the L metal fitting 27 are also made of an aluminum material which is the same material
as the support 20, the thermal expansion coefficients of the L metal fitting 23, the L metal fitting
27 and the support 20 become the same. The deformation of the screen speaker 10 due to the
expansion difference between the metal fitting 23 and the L metal fitting 27 and the support 20
can be reduced. Further, since the aluminum material is a metal, the expansion difference due to
the humidity change can be reduced, and the expansion difference due to the humidity change
between the L metal fitting 23 and the L metal fitting 27 and the support frame 20 can be
11-05-2019
24
reduced. The deformation of the speaker 10 can be further suppressed. In the present
embodiment, the screen S, the support 20, the L metal fitting 23, and the L metal fitting 27 are
formed of an aluminum material, but for the purpose of other metals such as aluminum alloy
containing aluminum, titanium alloy and magnesium alloy. It can also be used accordingly.
[0088]
In the above-described embodiment, the screen S and the support 20 are both made of aluminum
and have the same coefficient of thermal expansion, but one of them is made of an aluminum
alloy and the other is made of (pure) aluminum. It may be equal. The thermal expansion
coefficient of aluminum is about 24 × 10 <-6> / ° C., which is quite high, but if it is in the range
of ± 20% with respect to this thermal expansion coefficient, it is considered to be almost
equivalent. In comparison, the amount of deformation of the screen speaker 10 can be reduced.
[0089]
In the present embodiment, the screen S is an aluminum plate having a thickness of 0.8 mm and
an outer diameter of 1680 mm × 895 mm. However, the screen S is subjected to an alumite
treatment on the surface to form a surface of the alumite layer. And an acrylic resin layer of
about 9 to 16 microns. That is, after the alumite treatment, an acrylic emulsion liquid having a
predetermined concentration is dip-coated, passed through a heating furnace, and subjected to a
baking coating treatment generally called "generally known". As a result, the surface of the
screen S is covered with an acrylic resin, and becomes compatible with the acrylic adhesive.
When the peel test is conducted, the shear strength is 200 to 180 kgf / cm <2>, and the
necessary and sufficient numerical value is obtained, and it is confirmed that the fracture state of
the adhesive application part is cohesive failure of about 70% to 90% or more. did.
[0090]
In addition, by using an acrylic adhesive in combination at the joint between the L metal fitting
23 and the L metal fitting 27 and the housings 21L, 21S, etc., it is possible to fill fine gaps in the
joint, and from this joint The generation of abnormal noise is eliminated, and the sound quality is
improved because the adhesive hardness is moderately high.
[0091]
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25
The adhesion of the contact portion between the screen S and the inner frame 22 is easy to make
amplitude in the low band as the diaphragm area in the left and right direction between channels
increases, so the inner side is for improving the sound quality of the low band. The width
dimension of the bonding margin between the frame 22 and the screen S is preferably as small
as possible (narrow).
If the width of the bonding margin portion is too small, it becomes easy to peel off, so in the
present embodiment, the width of the bonding margin portion is set to about 16 mm. However, if
the size of the screen S becomes smaller, the width may be smaller.
[0092]
Also, when a large input is applied, the heat from the voice coil is transmitted to the screen S and
most of the heat is dissipated from the screen S, but if a large input is applied to the voice coil for
a long time, the screen The heat is stored in S, and as a result, the screen S may be deformed. In
this point, in the present embodiment, the side plates 21Ls and 21Ss of the casings 21L and 21S
are bonded to the screen S on the entire surface. Therefore, the contact area between the casings
21L and 21S and the screen S is large, the amount of heat conducted to the casings 21L and 21S
is large, and the deformation of the screen S is effectively prevented.
[0093]
Therefore, if an acrylic adhesive is used as in the present embodiment, and the width dimension
of the bonding margin between the screen S and the housings 21L and 21S is equal to or more
than the same size as the thickness of the housings 21L and 21S to 15 times or less, everyday In
such a structure, the screen S is less likely to be deformed with respect to various environmental
temperature changes, and a sufficient adhesive strength can be obtained.
[0094]
The L metal fitting 23 forms a screw insertion hole 23h in one side portion 23A, and forms a
screw hole 23hm in the other side portion 23B, so that a screw S is not used on the screw hole
23hm side without using a nut. Can be fastened to the L metal fitting 23.
11-05-2019
26
Therefore, only the screw S passing through the screw insertion hole 23 h may be fastened to the
L metal fitting 23 by the nut N. That is, since the number of the nuts N can be reduced, the
interference between the nuts N can be reduced, and the size of the L metal fitting 23 can be
reduced. Further, by forming screw holes 23hm on the corner side of the side portion 23B and
not using the nut N, the screw insertion holes 23h and the screw holes 23hm located on the
corner side of the L metal fitting 23 are made more angular. You can move to the side. That is,
both the space between the two screw insertion holes 23h formed in the side 23A and the space
between the two screw holes 23hm formed in the side 23B can be made wide. For this reason, it
is possible to firmly fix the members such as the casings 21L and 21S fixed to the side portion
23A or the side portion 23B firmly. In particular, since it is not necessary to use the nut N for the
screw S passing through the side portion 23B, the screw insertion hole 23h and the screw hole
23hm positioned on the corner of the L metal fitting 23 can be moved closer to the corner As
shown in FIG. 11B, the central portion of the screen speaker 10M where the four corner portions
of the four screen speakers M1, M2, M3 and M4 gather can be held closer to the corner portions.
. For this reason, the level ¦ step difference and clearance gap of this part can be reduced.
Therefore, it is possible to reduce the number of putty filling work steps for filling such steps and
gaps and the number of steps for polishing steps.
[0095]
As for the L metal fitting 27, as in the L metal fitting 23, a screw insertion hole 27h is formed in
one side 27A, and a screw hole 27hm is formed in the other side 27B. , The screw S can be
fastened to the L fitting 27 without using a nut. Therefore, the L metal fitting 27 can be
miniaturized, and the distance between the two screw insertion holes 27h formed in the side 27A
and the distance between the two screw holes 27hm formed in the side 27B are both wide. It can
be taken. For this reason, it is possible to firmly fix the housing 25, the housing 26, or the
magnetic circuit housing H fixed to the side 27A or the side 27B.
[0096]
Further, while the screw hole 23hm is formed on the side portion 23B side, the screw insertion
hole 23h is formed on the side portion 23A, whereby the space between the screw insertion hole
23h and the screw S is formed. The processing error of the L metal fitting 23 can be absorbed by
the gap, and the L metal fitting 23 can be attached to various places.
[0097]
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27
In the present embodiment, the L metal fitting 23 is used for fixing the housing 21L and the
housing 21S, for fixing the housing 21L and the housing 22A, and for fixing the holding frame
24 and the outer peripheral frame 21 or the inner frame 22.
The fastening portion by the L metal fitting 23 has a structure in which the plate thickness of the
side portions 23A and 23B of the L metal fitting 23 is added, and the structure is extremely
strong. Therefore, the fastening force of the screw S in the L metal fitting 23 can be increased,
and the fixing strength of each part can be increased. Then, along with this, the sound quality can
be improved as a result.
[0098]
In the present embodiment, an example is shown in which the support 20 is configured of the
outer peripheral frame 21, the inner frame 22 and the holding frame 24, but the configuration of
the support 20 is not limited to this. For example, even in the configuration using the outer
peripheral frame 21 and the holding frame 24, when the rigidity or the like as the support 20
can be secured, there is no need to use the inner frame 22. Further, with regard to the holding
frame 24, even when either the housing 25 or the housing 26 is omitted, the holding frame 24
can be used as the housing 25 if reliable holding of the magnetic circuit housing H and rigidity of
the support 20 can be ensured. It does not have to consist of both the housing 26 and the
housing 26. Furthermore, by increasing the number of the inner frames 22, the support 20 with
higher rigidity can be configured.
[0099]
It is an exploded perspective view of a screen speaker (a magnetic circuit is omitted) concerning
an embodiment of the invention, and is an assembly view when attaching a screen and a back
board to a support frame. 1A is a top side view of the screen speaker as viewed from the upper
direction of the screen speaker, and FIG. 1B is a screen speaker showing a state of attachment of
the screen and the back plate to a support. It is a fragmentary sectional view when a housing part
is cut in the front and back direction. It is a perspective view which shows the structure of the
support body used for the screen speaker of FIG. It is a perspective view which shows the outer
peripheral frame which comprises the support body used for the screen speaker of FIG. It is a
figure which shows the corner ¦ angular part of the outer periphery frame used for the screen
speaker of FIG. 1, (A) is an assembly drawing which shows the structure which fixes two housings
21 by L metal fitting, (B) is two housings. It is sectional drawing in the site ¦ part A of FIG. 3
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28
which shows the structure which fixes 21 with L metal fitting. It is a perspective view which
shows the outer peripheral frame and inner side frame which comprise the support body used
for the screen speaker of FIG. It is a figure which shows the structure of the support body used
for the screen speaker of FIG. 1, (A) is an assembly drawing which shows the structure which
fixes an outer peripheral frame and an inner frame by L metal fitting, (B) is an outer peripheral
frame It is sectional drawing in the site ¦ part B of FIG. 3 which shows the structure which fixes
an inner side frame by L metal fitting. It is a figure which shows the structure of the support
body used for the screen speaker of FIG. 1, and is a perspective view which shows the structure
of a holding frame. It is a figure which shows the structure of the support body used for the
screen speaker of FIG. 1, and is an assembly view holding a magnetic circuit housing to a
housing. It is a figure which shows the structure of the support body used for the screen speaker
of FIG. 1, and is an assembly drawing which shows the structure which fixes the housings which
comprise a magnetic circuit housing holding frame by L metal fittings. It is a figure showing a
screen speaker which made a large screen-ization combining four screen speakers, (A) is the rear
view, (B) is a four screen speaker when the screen speaker is cut in a plane direction. It is a
fragmentary sectional view of a portion where four corners were put together.
Explanation of sign
[0100]
S ... Screen H ... Magnetic circuit housing 10 ... Screen speaker 20 ... Support body 21 ... Outer
peripheral frame 21 L ... Housing body 21 Lb ... Bottom plate portion (plate) 21 Ls ... Side plate
portion (plate) 21 S ... Shield 21 Sb ... Bottom plate (plate) 21Ss: Side plate (plate) 23: L bracket
24: Magnetic circuit housing holding frame 25: Housing 25A: Flat plate (plate) 25B: Flat plate
(plate) 26: Housing 26A: Flat plate (plate) 26B ... Flat plate (plate) 27 ... L bracket
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