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JP2010093312

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DESCRIPTION JP2010093312
A flat plate speaker capable of dispersing split resonances to flatten frequency characteristics
while maintaining a symmetrical shape of a diaphragm, and an interior panel using the flat plate
speaker are provided. SOLUTION: A flat loudspeaker 100 according to the present invention is
formed symmetrically with respect to a geometric center O, a flange portion 121 of a
transmission member 104 is joined to a central portion, and an outer end is supported by an end
of a frame 101. And a vibration absorbing member 107 joined to the flat plate vibration plate
106 and the frame 101. The vibration absorbing member 107 is a flat plate vibration plate.
There are two vibration absorbing members 107 on any straight line passing through the
geometrical center O of the plate 106, and one place of the vibration absorbing member 107 and
the other places with respect to the geometric center O of the flat diaphragm 106. It is
characterized in that it is arranged asymmetrically. [Selected figure] Figure 1
Flat speaker and interior panel
[0001]
The present invention relates to a flat panel speaker and an interior panel, and more particularly
to a flat panel speaker and an interior panel used for a building such as a house, an apartment,
and an office building.
[0002]
A diaphragm of a conventional speaker will be described with reference to the drawings.
[0003]
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FIG. 7A is a plan view of the diaphragm showing a state in which the edges are pasted together.
FIG.7 (b) is the same sectional side view.
As shown in FIG. 7, the diaphragm 11 for the speaker is generated on the diaphragm by making
the shape non-concentric or the bonding shape of the diaphragm 11 and the roll edge 12 noncircular. The divided resonances are dispersed to flatten the frequency characteristics (see, for
example, Patent Document 1). JP-A-11-205895
[0004]
However, when attaching a speaker to a wall or ceiling of a building such as a house, it was
necessary to make the shape of the diaphragm symmetrical in order to prevent the
decorativeness of the building from being impaired. For this reason, the speaker attached to the
wall or ceiling of a building had the subject that an intrinsic resonance generate ¦ occur ¦
produced at a specific frequency and a severe peak dip arises in a frequency characteristic.
[0005]
An object of the present invention is to use a flat plate speaker capable of dispersing divided
resonances generated on the vibrating plate while maintaining the symmetrical shape of the
vibrating plate and flattening the frequency characteristics, and using the flat plate speaker The
purpose is to provide interior panels.
[0006]
In the flat panel speaker of the present invention, a frame, a magnetic circuit fixed to the frame, a
magnetic circuit having a magnetic gap, a voice coil disposed in the magnetic gap of the magnetic
circuit, and the voice coil wound on the lower end side A voice coil bobbin, a portion connected
to the upper end side of the voice coil bobbin, a transmission member having a flange portion
projecting outward from this, and an outer end supported by the end of the frame; And a
vibration absorbing member joined to the flat diaphragm and the frame, wherein the central
portion is coupled to the flange portion of the transmission member and vibrates by the driving
force generated from the magnetic circuit and the voice coil; The vibration absorbing member is
at least one on any straight line passing through the geometric center of the flat plate diaphragm,
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and the vibration absorbing member is provided at two places on the straight line. That case, the
the one location and the other locations of the vibration absorbing member, characterized in that
it is arranged asymmetrically with respect to the center of the flat diaphragm.
[0007]
According to the present invention, while maintaining the symmetrical shape of the flat
diaphragm such as a circle or a rectangle, the geometrical center portion is driven to disperse the
division resonance generated on the flat diaphragm to thereby obtain frequency characteristics.
Since a flat speaker can be provided, when the speaker is installed on the ceiling or wall of a
house, it is possible to enjoy music with a high quality sound without damaging the appearance
of the room.
[0008]
First Embodiment A flat loudspeaker 100 according to a first embodiment of the present
invention will be described below with reference to the drawings.
[0009]
FIG. 1 is a plan view of flat plate speaker 100 in accordance with the first exemplary embodiment
of the present invention.
FIG. 2 is a cross-sectional view when the cross section along the line A-A 'of the flat loudspeaker
100 in FIG. 1 is viewed from the direction of the arrow B. FIG.
FIG. 3 is a plan view of a flat loudspeaker 100 according to a modification of the first
embodiment of the present invention.
[0010]
As shown in FIGS. 1 and 2, the flat loudspeaker 100 includes a frame 101, a magnetic circuit 102
mounted on the frame 101, and a voice coil 103a disposed in the magnetic gap of the magnetic
circuit 102. A voice coil bobbin 103b around which the voice coil 103a is wound, a cylindrical
transmission member 104 coupled to the voice coil bobbin 103b, a damper 105 coupled to the
voice coil bobbin 103b and the frame 101, a frame 101, and a cylindrical A flat diaphragm 106
coupled to the transmission member 104 and a vibration absorbing member 107 coupled to the
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frame 101 and the flat diaphragm 106 are provided.
[0011]
The frame 101 is made of metal such as steel and hard resin.
The frame 101 is recessed except for the outer peripheral portion.
A magnetic circuit 102 is fixed at the center of the frame 101.
The magnetic circuit 102 has a magnetic air gap. The cylindrical transmission member 104 has a
cylindrical portion 120 formed in a cylindrical shape with both ends open, and a horizontal flat
flange portion 121 extending in a direction projecting outward from the upper end side of the
cylindrical portion 120. Equipped with One end of the voice coil bobbin 103 b is coupled to the
lower end side of the cylindrical portion 120. The voice coil 103a is coupled to the other end of
the voice coil bobbin 103b. The other end of the voice coil bobbin 103 b and the voice coil 103 a
coupled to the other end of the voice coil bobbin 103 b are disposed in the magnetic gap of the
magnetic circuit 102. The outer peripheral side surface of the voice coil bobbin 103 b is coupled
to the inner periphery of the damper 105. The outer periphery of the damper 105 is joined to
the frame 101. The flange portion 121 is joined to a geometric center portion which is a region
near the geometric center of the flat plate diaphragm 106. As shown in FIG. 1, the shape of the
flat diaphragm 106 is square in this embodiment. The geometric center of the flat plate
diaphragm 106 in the present embodiment means an intersection point of perpendicular
bisectors drawn on each side of the flat plate diaphragm 106. In the present embodiment, the flat
diaphragm 106 has a square shape, but may have a circular shape or a polygonal shape. When
the shape of the flat diaphragm 106 is circular, it means that the geometrical center is equal to
the distance from any outer periphery of the circle constituting the flat diaphragm 106. Further,
when the shape of the flat diaphragm 106 is a polygon, the geometric center means that the
distance of any straight line drawn from each vertex is equal.
[0012]
As shown in FIG. 1, the flat diaphragm 106 is symmetrical with respect to the geometric center
O. Here, symmetry with respect to the geometric center O means that the same shape is obtained
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even if the flat diaphragm 106 is rotated by 180 °. As shown in FIG. 2, the flat diaphragm 106
vibrates via the flange portion 121 by the driving force generated from the magnetic circuit 102
and the voice coil 103 a. It is desirable that the position of the geometrical center of the magnetic
circuit 102, the position of the center of the flange portion 121, and the position of the
geometrical center O of the flat plate diaphragm 106 coincide with each other in order to secure
the sound pressure. The outer end of the flat diaphragm 106 is joined to the outer periphery of
the frame 101. By integrating the transmission member 104 and the voice coil bobbin 103b, the
number of parts can be reduced, and the cost can be reduced.
[0013]
As shown in FIG. 2, the vibration absorbing member 107 is provided in a space formed by the
frame 101 and the flat diaphragm 106. Then, the vibration absorbing member 107 is disposed in
series and surrounds the magnetic circuit 102. The vibration absorbing member 107 is joined to
the frame 101 and the flat diaphragm 106. The vibration absorbing member 107 is suitably
made of rubber, wood, resin, or the like that has large damping of vibration. Accordingly, it is
possible to make it difficult for the magnetic circuit 102 and the cylindrical transmission member
104 to transmit the vibration generated from the center of the flat diaphragm 106 to the outer
peripheral side.
[0014]
As shown in FIG. 1, when an imaginary straight line L11 passing through the geometric center O
of the flat plate diaphragm 106 is drawn, the straight line L11 intersects with the vibration
absorbing member 107 at two points. No matter how the straight line L11 is drawn, the vibration
absorbing member 107 is always present on the straight line L11. Here, assuming that two
points where the straight line L11 intersects the vibration absorbing member 107 on the
geometric center O side are points C11 and C12, respectively, the vibration absorbing member
107 extends from the geometric center O to the point C11. The distance and the distance from
the geometric center O to the point C12 are always arranged to be different. Therefore, no matter
which straight line L11 is drawn, the point C11 and the point C12 of the vibration absorbing
member 107 are asymmetrically arranged with respect to the geometric center O of the flat plate
diaphragm 106.
[0015]
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Thus, by arranging the vibration absorbing member 107 asymmetrically with respect to the
geometric center O of the flat plate diaphragm 106, split resonance is effectively dispersed on
the flat plate diaphragm 106 driven by the flange portion 121. Ru. Therefore, even in the flat
speaker used for the wall or ceiling for a house by the above configuration, the split resonance is
dispersed while the flat diaphragm 106 has a symmetrical shape with respect to the geometric
center O, and the frequency characteristic is Can be flat.
[0016]
In the present embodiment, the shape of the flat diaphragm 106 is rectangular, but any shape
such as circular or hexagonal may be used. Alternatively, the vibration absorbing member 107
may be provided so that the position of the center of gravity of the region surrounded by the
vibration absorbing member 107 matches the position of the geometric center O of the flat plate
diaphragm 106. As a result, it is possible to prevent the occurrence of abnormal sound due to a
rolling phenomenon called rolling, as the weight balance of the flat diaphragm 106 is broken.
[0017]
Further, as shown in FIG. 1, in the present embodiment, a portion of the flange portion 121
coupled to the flat plate diaphragm 106 has a substantially circular shape symmetrical with
respect to the position of the geometric center O of the flat plate diaphragm 106. However, as
shown in FIG. 3, the portion of the flange portion 122 coupled to the flat plate diaphragm 106 is
formed in an asymmetrical shape with respect to the position of the geometric center O of the
flat plate diaphragm 106. May be Here, to be formed in an asymmetrical shape with respect to
the position of the geometric center O of the flat plate diaphragm 106 means that two flanges
122 are provided on any straight line passing through the geometric center O of the flat plate
diaphragm 106. It means that one portion of the flange portion 122 and the other portion are
formed in an asymmetrical shape with respect to the geometric center of the flat plate diaphragm
106. Then, regardless of which straight line L31 is drawn, regarding the two intersections of the
straight line L31 and the outer periphery of the flange portion 122, assuming that the
intersection on the point C31 side is the point C33 and the intersection on the point C32 side is
the point C34, The distance from C31 to C33 is different from the distance from C32 to C34.
Thereby, it is possible to further disperse the split resonance and to suppress the peak dip of the
frequency characteristic.
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[0018]
Second Embodiment A flat loudspeaker 200 according to a second embodiment of the present
invention will be described below with reference to the drawings. The same parts as those of the
first embodiment are designated by the same reference numerals and the description thereof is
omitted.
[0019]
FIG. 4 is a plan view of flat plate speaker 200 in accordance with the second exemplary
embodiment of the present invention. A cross-sectional view of the flat loudspeaker 200 taken
along the line D-D 'in FIG. 4 as viewed in the direction of the arrow E is the same as that of FIG.
FIG. 5 is a plan view of a flat loudspeaker 200 according to a modification of the second
embodiment of the present invention.
[0020]
As shown in FIG. 4, the vibration absorbing members 207 are not continuous but provided in
plural.
[0021]
As shown in FIG. 4, when an imaginary straight line L41 or a straight line L42 passing through
the geometric center O of the flat plate diaphragm 106 is drawn, the straight line L41 intersects
with the vibration absorbing member 207 at two points, and the straight line L42 Crosses with
the vibration absorbing member 207 at one place.
Therefore, regardless of how the straight line L41 or the straight line L42 is drawn, the vibration
absorbing member 207 always exists on the straight line L41 or the straight line L42.
[0022]
Here, when the straight line L41 intersects with the vibration absorbing member 207 at two
places, assuming that two points intersecting at the geometric center O side are point C41 and
point C42 as in the first embodiment, respectively, the vibration absorbing member 207 Are
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arranged such that the distance from the geometric center O to the point C41 and the distance
from the geometric center O to the point C42 are always different.
[0023]
Further, when the straight line L42 intersects the vibration absorbing member 207 at only one
point, assuming that the crossing point is point C43 and the crossing point of the straight line
L42 and the flat plate diaphragm 106 is C44, the distance from the geometric center O to the
point C43 The distance from the geometric center O to the point C 44 is always different.
[0024]
Therefore, regardless of which straight line L41 is drawn, the point C41 and the point C42 of the
vibration absorbing member 207 are asymmetrically arranged with respect to the geometric
center O of the flat plate diaphragm 106.
Further, no matter which straight line L42 is drawn, the point C43 and the point C44 are
asymmetrically arranged with respect to the geometric center O of the flat plate diaphragm 106.
[0025]
As a result, the outer end of the flat diaphragm 106 can be vibrated. Therefore, even in the case
of a flat speaker used for a wall or a ceiling for a house, a large sound pressure by the flat
diaphragm 106 is maintained. While the diaphragm 106 is shaped symmetrically with respect to
the geometric center O, the split resonance can be dispersed to flatten the frequency
characteristics.
[0026]
Further, as shown in FIG. 4, in the present embodiment, a portion of flange portion 121 coupled
to flat plate diaphragm 106 has a substantially circular shape symmetrical with respect to the
position of geometric center O of flat plate diaphragm 106. However, as shown in FIG. 5, the
portion of the flange portion 123 coupled to the flat plate diaphragm 106 is formed in an
asymmetrical shape with respect to the position of the geometric center O of the flat plate
diaphragm 106 It is also good.
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Here, to be formed in an asymmetrical shape with respect to the position of the geometric center
O of the flat plate diaphragm 106 means that two flanges 123 are formed on any straight line
passing through the geometric center O of the flat plate diaphragm 106. It means that one part
of the flange part 123 and the other part are formed in an asymmetrical shape with respect to
the geometric center of the flat plate diaphragm 106.
Then, when the straight line L51 intersects with the vibration absorbing member 207 at two
points, the two intersections of the straight line L51 and the outer periphery of the flange portion
123 are the point C55 at the point C51 and the point C56 at the point C52. When any straight
line L51 is drawn, the distance from the point C51 to the point C55 is different from the distance
from the point C52 to the point C56. Alternatively, when the straight line L52 intersects with the
vibration absorbing member 207 at one point, the intersection on the point C53 side is set as a
point C57 and the intersection on the point C54 side is a point C58 for two intersections of the
straight line L52 and the outer periphery of the flange portion 123. When any straight line L52
is drawn, the distance from the point C53 to the point C57 is different from the distance from the
point C54 to the point C58. Thereby, it is possible to further disperse the split resonance and to
suppress the peak dip of the frequency characteristic.
[0027]
Third Embodiment Hereinafter, an interior panel 300 according to a third embodiment of the
present invention will be described with reference to the drawings. The same parts as in the first
embodiment and the second embodiment are denoted by the same reference numerals, and the
description will be omitted.
[0028]
FIG. 6 is a cross-sectional view of the interior panel 300 in the third embodiment of the present
invention. As shown in FIG. 6, the interior panel 300 is provided with a crosspiece 301 and a flat
speaker 100 embedded in the crosspiece 301. In the flat speaker 100 according to the present
embodiment, a decorative plate 306 used for a wall or a ceiling is used instead of the flat
diaphragm 106. The flat loudspeaker 200 of the second embodiment may be embedded in the
crosspiece 301. Also in this case, the decorative plate 306 is used as a diaphragm. The interior
panel 300 is used as a partition such as a wall or a ceiling in a building such as a house.
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[0029]
A plurality of bars 301 are used. It is desirable from the viewpoint of reinforcement that the
plurality of crosspieces 301 be assembled in a well-gage shape. The flat speaker 100 integrally
molded with the decorative plate 306 is embedded in a rectangular space formed by the
crosspieces 301 being assembled in a cross-girder shape. The bar 301 is coupled to the frame
101. As a result, the interior panel 300 can improve the acoustic performance while maintaining
a comfortable design as a wall or a ceiling for a building such as a house.
[0030]
INDUSTRIAL APPLICABILITY The flat panel loudspeaker of the present invention is useful as an
acoustic device installed in a building such as a house, an apartment, an office building and the
like.
[0031]
1 is a plan view of the flat panel loudspeaker in accordance with Embodiment 1 of the present
invention, and FIG. 2 is a sectional view of the flat panel loudspeaker taken along line A-A 'in FIG.
Top view of flat panel speaker Top view of flat panel speaker in the second embodiment of the
present invention Top view of flat panel speaker in the modification of the second embodiment of
the present invention Cross section of the interior panel in the third embodiment of the present
invention (a) A plan view of a diaphragm showing a state in which the edges of a conventional
speaker are bonded, a cross-sectional view of a diaphragm showing a state in which the edges of
a conventional speaker are bonded
Explanation of sign
[0032]
100, 200 flat plate speaker 101 frame 102 magnetic circuit 103a voice coil 103b voice coil
bobbin 104 transmission member 105 damper 106 flat plate diaphragm 107, 207 vibration
absorbing member 120 cylindrical portion 121 flange portion 300 interior panel 301 crosspiece
306 decorative plate
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