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JP2012253603

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Notice
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
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2012253603
The present invention can effectively transmit the vibration generated by a drive member to the
entire diaphragm, reduce the depth dimension, and control the sound pressure in a wide
frequency band even if the narrow and narrow front shape is adopted. It is possible to reproduce
sharp bass and clear middle to high tone, to have good tone reproducibility, and to have high
sound quality. A speaker device having a flat diaphragm and a driver unit for vibrating the
diaphragm, wherein the diaphragm has a narrow and elongated planar shape, and the driver unit
is driven to generate a vibration. Member, a vibration transmission member for transmitting the
vibration of the drive member to the diaphragm, and a vibration transmission auxiliary member
added to the vibration transmission member, the vibration transmission member being in contact
with the rear surface of the diaphragm, the vibration transmission auxiliary member being And
abuts on the rear surface of the diaphragm over a range wider than the vibration transmitting
member in the longitudinal direction of the moving plate. [Selected figure] Figure 1
Speaker device
[0001]
The present invention relates to a speaker device.
[0002]
2. Description of the Related Art Conventionally, a speaker device having a flat diaphragm is used
to generate sound by being attached to a television receiver or the like (see, for example, Patent
Document 1).
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Such a speaker device has a dynamic type speaker unit and vibrates a flat diaphragm provided in
the speaker unit to generate sound.
[0003]
FIG. 7 is a cross-sectional view showing the structure of a conventional speaker device.
[0004]
In the figure, reference numeral 831 denotes a frame of the speaker device, which supports the
speaker unit and is attached to an audio device such as a television receiver by fixing an
attachment member (not shown) formed around the member with a bolt or the like.
[0005]
A magnet 841 functioning as a driver unit of the speaker device, a bottom plate 842a, a top plate
842b, a center port 842c, a voice coil 843 and the like are disposed behind (downward in the
drawing) the frame 831.
The voice coil 843 is wound around a cylindrical bobbin 844.
[0006]
Further, a flat diaphragm 846 is disposed on the front surface (upper surface in the figure) of the
frame 831.
The diaphragm 846 has its outer periphery coupled to the front end of the frame 831 via a
diaphragm edge 847 and a gasket 837. The rear surface of the diaphragm 846 is coupled to the
bobbin 844 via a drive cone 851. The inner periphery of the damper 848 is connected to the
outer periphery of the bobbin 844, and the outer periphery of the damper 848 is connected to
the frame 831.
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[0007]
Thereby, the vibration of the voice coil 843 is transmitted to the diaphragm 846 through the
bobbin 844 and the drive cone 851, and a desired sound can be reproduced.
[0008]
JP-A-61-113399
[0009]
However, in the conventional speaker device, when the diaphragm 846 has an elongated flat
plate shape such as a rectangular shape, the vibration of the voice coil 843 can not be
transmitted faithfully to the entire diaphragm 846, and the sound quality is degraded. Resulting
in.
[0010]
In recent years, miniaturization and thinning of audio equipment such as a television receiver
have progressed, and in particular, in an audio equipment such as a flat television receiver using
a liquid crystal display, a plasma display, etc., a speaker device is attached inside It is difficult to
find a space with depth.
Also, it is difficult to find a wide space in the frame portion around the display.
[0011]
Therefore, in order to be attached to a thin and small-sized audio device such as a flat-screen
television receiver, it is necessary to reduce the depth dimension of the speaker device and to
adopt a narrow and elongated front shape. When the depth dimension is reduced, the distance
between the voice coil 843 and the diaphragm 846 becomes short, and when the narrow front
shape is adopted, the diaphragm 846 narrows and becomes elongated. It becomes difficult to
transmit to the whole, and the sound quality is degraded.
[0012]
The present invention solves the problems of the above-mentioned conventional speaker device,
and adds a vibration transmission assisting member to a vibration transmitting member for
transmitting the vibration generated by the driving member to a flat diaphragm, thereby
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providing The generated vibration can be effectively transmitted to the entire diaphragm, and the
sound pressure can be controlled in a wide frequency band even if the depth dimension is
reduced and the narrow and narrow front shape is adopted, It is an object of the present
invention to provide a speaker device which can reproduce good bass and clear middle and high
tones, has excellent sound reproducibility, and has high sound quality.
[0013]
Therefore, in the speaker device of the present invention, the speaker device has a flat diaphragm
and a driver unit for vibrating the diaphragm, and the diaphragm has a narrow and elongated
planar shape. The driver unit includes a driving member generating vibration, a vibration
transmitting member transmitting vibration of the driving member to the diaphragm, and a
vibration transmitting auxiliary member added to the vibration transmitting member, the
vibration transmitting member Is in contact with the rear surface of the diaphragm, and the
vibration transmission auxiliary member is in contact with the rear surface of the diaphragm
over a wider range than the vibration transmission member in the longitudinal direction of the
diaphragm.
[0014]
In another speaker device according to the present invention, the diaphragm further includes a
rear convex portion protruding rearward, and the front end edge of the vibration transmission
member and the front end edge of the vibration transmission auxiliary member are the rear
convex portion. Abuts the back of the
[0015]
In still another speaker device according to the present invention, the vibration transfer member
is a cylindrical member extending forward from the front end of the drive member, and the
vibration transfer assisting member is the vibration transfer member. A member with a closed
cross-section attached to the front end of the
[0016]
In still another speaker device according to the present invention, the vibration transfer assisting
member further includes a tube including a straight portion extending in a straight line parallel
to each other and a corner portion connecting both ends of the straight portion. The back convex
portion includes a pair of straight portions, and the entire front end edge of the straight portion
abuts on the back surface of the straight portion.
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[0017]
In still another speaker device according to the present invention, the longitudinal dimension of
the vibration transfer auxiliary member is 1/3 to 1/2 of the longitudinal dimension of the
diaphragm.
[0018]
According to the present invention, the speaker device is configured to add the vibration
transmission assisting member to the vibration transmitting member for transmitting the
vibration generated by the driving member to the flat diaphragm.
Thereby, since the vibration generated by the drive member can be effectively transmitted to the
entire diaphragm, the sound pressure can be reduced in a wide frequency band even if the depth
dimension is reduced and the narrow and elongated front shape is adopted. It is possible to
control, to reproduce sharp bass and clear middle to high tones, to improve the reproducibility of
the sound, and to improve the sound quality.
[0019]
It is an exploded view of a speaker device in an embodiment of the present invention.
It is a perspective view of the speaker apparatus in embodiment of this invention, (a) is the figure
seen from diagonally front, (b) is the figure seen from diagonally back.
BRIEF DESCRIPTION OF THE DRAWINGS It is a figure explaining the internal structure of the
speaker apparatus in embodiment of this invention, (a) is a top view, (b) is AA arrow sectional
drawing of (a), (c) is (a) It is a BB arrow sectional drawing.
It is a perspective view of a diaphragm in an embodiment of the present invention, (a) is a figure
seen from slanting back, (b) is a figure seen from slanting front.
BRIEF DESCRIPTION OF THE DRAWINGS It is a figure explaining the structure of the diaphragm
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in embodiment of this invention, (a) is a top view, (b) is a side view, (c) is a bottom view, (d) is C-C
of (a) It is arrow sectional drawing.
It is a figure explaining the coupling structure of the bobbin and sub-bobbin in embodiment of
this invention, (a) is the figure which couple ¦ bonded the bobbin and sub-bobbin, (b) is the figure
which isolate ¦ separated the bobbin and sub-bobbin.
It is sectional drawing which shows the structure of the conventional speaker apparatus.
[0020]
Hereinafter, embodiments of the present invention will be described in detail with reference to
the drawings.
[0021]
FIG. 1 is an exploded view of the speaker device according to the embodiment of the present
invention, and FIG. 2 is a perspective view of the speaker device according to the embodiment of
the present invention.
なお。
In FIG. 2, (a) is a view as viewed from diagonally front, and (b) is a view as viewed from
diagonally rear.
[0022]
In the figure, reference numeral 10 denotes a speaker device according to the present
embodiment, which is used by being attached to various audio devices such as a television
receiver, a radio receiver, a personal computer, a CD player, a DVD player, a game machine, etc.
Is an audio generator driven by the audio signal to reproduce the audio signal.
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Loudspeaker device 10 according to the present embodiment can be miniaturized, and thus,
typically, a thin television receiver using a liquid crystal display, a plasma display, etc., a portable
personal computer, a PDA (Personal Digital), etc. Assistant), used in thin or small electric devices
such as portable game machines, etc., electronic devices, etc., but used in any parts of any kind of
electric devices, electronic devices etc. of any size It may be done.
[0023]
In the present embodiment, expressions used to describe the configuration and operation of each
part of the speaker device 10 and indicating directions such as upper, lower, left, right, front, and
rear are not absolute ones. Although it is relative and is appropriate when the speaker device 10
or the component thereof is in the posture shown in the drawing, when the posture of the
speaker device 10 or the component thereof changes, it is changed according to the change of
the posture And should be interpreted.
[0024]
The speaker device 10 includes a driver unit 40 that reproduces an audio signal to generate a
sound, a frame 31 as a holding member that holds the driver unit 40, the diaphragm unit 46, and
the like, and the frame 31. And a housing 11 which is attached to the frame 31 so as to cover the
rear of the frame 31 and which forms a housing with the frame 31.
Although members such as the bobbin 44 and the sub-bobbin 51 are disposed on the rear
surface of the diaphragm unit 46, the details of these members will be described later. The frame
31 is typically an integrally formed member made of a resin such as a synthetic resin, but may be
made of a metal such as aluminum, steel, copper or the like, resin, carbon, etc. It may be made of
a composite material in which a metal or the like is composited. The frame 31 has a front wall
32, a side wall 33, and an end wall 35. The front wall 32 is a bottom, and the rear ends of the
side wall 33 and the end wall 35 are opened. It is a bottomed container-like member, and further
has a driver unit housing 34.
[0025]
The front wall portion 32 is a flat (flat) plate-like member, and in the example shown in the
figure, the outline of the projection plane with respect to the plane is shaped like an elongated
rectangle, but the major axis It may be in the shape of an oval (elliptical circle), an oval or the
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like, and a short axis. In addition, although the outer shape of the projection plane with respect to
the plane is also an elongated rectangular shape, the entire speaker device 10 may be an
elliptical shape, an oval shape, or the like having a major axis and a minor axis. In other words,
the dimensions in the width direction (short axis direction) of the speaker device 10 and the front
wall 32 are shorter than the dimensions in the longitudinal direction (long axis direction).
[0026]
Further, in the front wall portion 32, a diaphragm accommodating opening 32a is formed as an
opening which penetrates the front wall portion 32 in the thickness direction. The dimension of
the inner peripheral edge of the diaphragm receiving opening 32a is slightly smaller than that of
the outer peripheral edge of the diaphragm unit 46, and the vicinity of the outer peripheral edge
of the flat diaphragm unit 46 is supported from the rear surface There is. In the example shown
in the figure, the shape of the outer peripheral edge of the diaphragm unit 46 is such a shape
that four corners of an elongated rectangle are cut off obliquely, and the shape of the inner
peripheral edge of the diaphragm receiving opening 32a is a long axis and a short It is shaped
like an ellipse or oval with an axis.
[0027]
The side wall portion 33 is an elongated rectangular plate member extending in the longitudinal
direction of the front wall portion 32 so that each of a pair of long sides of the front wall portion
32 is orthogonal to the front wall portion 32. It is connected to the. Further, the end wall portion
35 is connected to each of longitudinal end portions of the front wall portion 32 and the side
wall portion 33 so as to be orthogonal to the front wall portion 32 and the side wall portion 33.
The front wall portion 32, the pair of side wall portions 33, and the pair of end wall portions 35
define an elongated rectangular parallelepiped shaped box-like space opened rearward.
[0028]
Further, the driver unit housing portion 34 is a substantially annular or cylindrical member, and
the central axis thereof is orthogonal to the front wall portion 32, and the longitudinal center of
the front wall portion 32, and It is disposed to be located substantially at the center of the
diaphragm receiving opening 32a in the longitudinal direction. The driver unit accommodating
portion 34, which is a substantially annular or cylindrical member, has an outer diameter
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substantially equal to the dimension in the width direction of the frame 31 and the front wall
portion 32, and portions positioned at both ends in the width direction of the frame 31 are The
pair of side wall portions 33 is formed to be integrated with a portion located substantially at the
center in the longitudinal direction. The driver unit housing 34 functions as a casing for housing
a driver unit 40 including a magnet 41 and the like described later.
[0029]
Further, one or more rod-like connecting members 36 are disposed on the side of the driver unit
accommodating portion 34. Both ends of the connection member 36 are connected to the side
wall portions 33, and play a role of improving the strength of the frame 31. In the rear surface of
the front wall portion 32, one or more rib portions 36a extending in the width direction are
integrally formed. Both ends of the rib portion 36a are connected to the side wall portions 33,
and play a role of improving not only the strength of the front wall portion 32 but also the
strength of the frame 31. The shape, size, and number of the connecting member 36 and the rib
portion 36a can be set arbitrarily, and can be omitted as necessary.
[0030]
The end wall portion 35 has an attaching portion 35 a and an engaging portion 35 d. The
engaging portion 35 d is a portion engaged with the engaging portion 15 a of the end wall
portion 15 of the housing 11 and is a recess formed in the end wall portion 35. Further, the
mounting portion 35a is parallel to the front wall portion 32, and a fixing plate portion 35b
extending outward in the longitudinal direction of the frame 31 from the end wall portion 35,
and a mounting formed on the fixing plate portion 35b. And an opening 35c. The fixing plate
portion 35 b is a portion that contacts a speaker fixing member (not shown) provided in an
electric device, an electronic device or the like to which the speaker device 10 is attached.
Further, the mounting opening 35c is a portion through which a fixing member such as a bolt or
a screw is inserted. The shape and size of the mounting portion 35a are appropriately changed in
accordance with the shape and size of the portion on which the speaker device 10 is mounted in
a housing such as an electric device or an electronic device. For example, the diameter of the
mounting opening 35c is changed according to the outer diameter of the fixing member such as
a bolt or a screw. Furthermore, the dimension in the front-rear direction of the attachment
portion 35a is changed according to the position of the speaker fixing member provided in the
electric device, the electronic device, and the like.
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[0031]
The housing 11 is typically an integrally formed member made of resin such as synthetic resin,
but may be made of metal such as aluminum, steel, copper, etc., resin, It may be made of a
composite material in which carbon, metal and the like are combined. The housing 11 has a side
wall 12, a rear wall 13 and an end wall 15, with the rear wall 13 as a bottom, and the front ends
of the side wall 12 and the end wall 15 are open. It is a container-like member, and further has a
driver unit corresponding opening 13 a formed in the rear wall 13.
[0032]
The rear wall portion 13 is a flat plate-like member, but the shape and size of the outline of the
projection plane with respect to a plane are substantially the same as the front wall portion 32 of
the frame 31 and a shape like an elongated rectangle Or, it has an oval, oval, etc. shape having a
major axis and a minor axis.
[0033]
As described above, it is desirable to set the shape of the housing 11 and the dimensions in the
longitudinal direction and the width direction, as well as the shapes of the frame 31 and the front
wall portion 32 and the dimensions in the longitudinal direction and the width direction.
As a result, the space for mounting the speaker device 10 in the interior of an electric device, an
electronic device, etc. is narrow, and the housing 11 is attached to the frame 31 even if there is
no margin over the dimensions of the frame 31 in the vertical and horizontal directions. It
becomes possible to use.
[0034]
Further, the driver unit corresponding opening 13a is an opening having a substantially circular
cross section, and the central axis thereof is orthogonal to the rear wall 13 and located
substantially at the center of the rear wall 13 in the longitudinal direction. Arranged as. The inner
diameter of the driver unit corresponding opening 13a is substantially equal to the outer
diameter of the driver unit 40, and functions as a vent for exposing the rear end surface of the
driver unit 40 to the outside and contacting the outside air.
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[0035]
Further, the side wall portion 12 is an elongated rectangular plate member extending in the
longitudinal direction of the rear wall portion 13 so that each of a pair of long sides of the rear
wall portion 13 is orthogonal to the rear wall portion 13 It is connected to the. The dimension in
the front-rear direction of the side wall portion 12 is set smaller than the dimension in the frontrear direction of the side wall portion 33 of the frame 31. Furthermore, the end wall portion 15
is connected to each of longitudinal end portions of the rear wall portion 13 and the side wall
portion 12 so as to be orthogonal to the rear wall portion 13 and the side wall portion 12. The
rear wall portion 13, the pair of side wall portions 12 and the pair of end wall portions 15 define
an elongated rectangular parallelepiped shaped forwardly open shallow box-like space.
[0036]
The end wall portion 15 has an engaging portion 15a and a sound quality adjustment hole 15b.
The engaging portion 15 a is a portion engaged with the engaging portion 35 d of the end wall
portion 35 of the frame 31, and is a convex portion formed on the end wall portion 15. Further,
the sound quality adjustment hole 15b is an opening opened to the end wall portion 15, and is
connected to a communication passage 15c described later.
[0037]
Then, as shown in FIG. 2, the housing 11 brings the front ends of the side wall 12 and the end
wall 15 into contact with the rear ends of the side wall 33 and the end wall 35 of the frame 31,
as shown in FIG. It is combined with the frame 31. As a result, a housing including a closed space
in which the driver unit 40 is accommodated is formed. Since the space communicates with the
outside air through the sound quality adjustment hole 15b and the communication passage 15c,
various adjustments can be made by adjusting the length, cross sectional shape, size of the cross
section, etc. of the sound quality adjustment hole 15b and the communication passage 15c. The
sound pressure in the frequency band can be controlled. The rear end surface of the driver unit
40 is exposed to the outside through the driver unit corresponding opening 13a.
[0038]
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Next, the internal structure of the speaker device 10 will be described.
[0039]
3 is a view for explaining the internal structure of the speaker device in the embodiment of the
present invention, FIG. 4 is a perspective view of the diaphragm in the embodiment of the
present invention, and FIG. 5 is a structure of the diaphragm in the embodiment of the present
invention FIG. 6 is a view for explaining the connection structure of the bobbin and the subbobbin in the embodiment of the present invention.
In FIG. 3, (a) is a top view, (b) is a cross-sectional view taken along the line AA in (a), and (c) is a
cross-sectional view taken along the line BB in (a). (A) is a view from diagonally rear, (b) is a view
from diagonally front, in FIG. 5, (a) is a top view, (b) is a side view, (c) is a bottom view, (D) is a
cross-sectional view taken along the line C-C in (a). In FIG. 6, (a) is a view in which the bobbin and
the sub-bobbin are connected, and (b) is a view in which the bobbin and the sub-bobbin are
separated.
[0040]
As shown in the figure, the driver unit 40 has a cylindrical unit case 40a with a bottom, and a
magnet 41 as a magnet housed in the unit case 40a, a plate 42, a coil 43 as a voice coil, vibration
It has a bobbin 44 as a transmission member, a sub-bobbin 51 as a vibration transmission
auxiliary member, and a cord 52 as an electric wire.
[0041]
The magnet 41 is a permanent magnet made of a material having a high coercive force, and is a
member having a substantially cylindrical shape.
The rear surface of the magnet 41 is in contact with the inner surface of the bottom plate of the
unit case 40a, that is, the front surface. The unit case 40 a functions as a casing for housing the
magnet 41 and also functions as a heat dissipation member for dissipating heat of the driver unit
40 and also functions as a yoke for forming a magnetic path together with the magnet 41. .
Therefore, it is desirable that the unit case 40a be made of, for example, a material having high
thermal conductivity such as soft iron and high permeability.
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[0042]
The plate 42 is a member that functions as a yoke that forms a magnetic path, and is made of, for
example, a high permeability material such as soft iron. The plate 42 is a plate member having a
disk-like shape, and its rear surface is in contact with the front surface of the magnet 41.
[0043]
Furthermore, the coil 43 is, for example, a member formed by winding a conducting wire made
of a highly conductive material such as copper around the outer peripheral surface of the rear
end of the cylindrical bobbin 44 extending in the front-rear direction. Function as a driving
member. The coil 43 has a thin-walled cylindrical shape as a whole, and in the gap between the
inner surface of the cylindrical portion of the unit case 40a and the outer surface of the plate 42,
that is, in the gap, It is arranged to be movable in the direction.
[0044]
Further, the bobbin 44 extends forward from the front end of the coil 43, and a sub-bobbin 51 is
attached to the front end. The front end edge of the bobbin 44 and the front end edge of the subbobbin 51 are in contact with the rear surface of the diaphragm 45 of the diaphragm unit 46 and
are fixed, for example, by an adhesive or the like. The cord 52 is an electric wire for transmitting
an audio signal which is an electric signal to the coil 43, one end not shown is connected to the
cord 52, and the other end is another cord to an audio signal generating device such as an
amplifier not shown. Connected through. As shown in FIG. 3 (b), it is desirable that the cord 52
be held by the connecting member 36 of the frame 31 at the middle part.
[0045]
In the present embodiment, the diaphragm unit 46 is a flat member as a whole, and has a shape
in which four corners of an elongated rectangle are cut off obliquely. Further, the diaphragm unit
46 has a diaphragm 45 in the form of a flat plate as a whole and a diaphragm edge portion 47
connected to the outer periphery of the diaphragm 45. In the example shown in the figure, the
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shape of the outer peripheral edge of the diaphragm 45 is an oval or oval shape having a major
axis and a minor axis, and the shape of the inner peripheral edge of the diaphragm edge portion
47 is The shape of the outer peripheral edge of the diaphragm edge part 47 is the same as the
shape of the outer peripheral edge of the diaphragm 45, such that the four corners of a long and
thin rectangle are cut off obliquely.
[0046]
And although the said diaphragm 45 is flat form as a whole, in order to improve rigidity, the
unevenness ¦ corrugation is provided. In the example shown in the drawing, a convex portion 45
a that protrudes forward is formed. The planar shape of the convex portion 45 a is shaped like an
oval or oval ring having a major axis and a minor axis so as to conform to the shape of the outer
peripheral edge of the diaphragm 45. Further, a portion adjacent to the convex portion 45a is a
recessed portion 45b which is relatively recessed. The concave portion 45b is divided by the
convex portion 45a into a first concave portion 45b1 and a second concave portion 45b2
positioned on the inner side and the outer side of the convex portion 45a.
[0047]
In the example shown in the figure, the convex portion 45a is singular but may be plural. For
example, it can be formed to draw double to triple or more multiple rings. In this case, the
concave portion 45 b is further divided into a large number by the plurality of convex portions
45 a. When viewed from the rear, the recessed portion 45b is a portion protruding rearward, that
is, a rear convex portion, and a portion in which the convex portion 45a is relatively recessed,
that is, a rear recessed portion.
[0048]
In addition, although the diaphragm edge portion 47 also has a flat shape as a whole, in order to
enhance the flexibility, a thin curved portion 47a which is easily deformed is formed. In the
example shown in the figure, the curved portion 47a is formed to project forward, but may be
formed to be recessed, that is, project rearward. The planar shape of the curved portion 47a is
shaped like an oval or oval ring having a major axis and a minor axis so as to conform to the
shape of the inner peripheral edge of the diaphragm edge portion 47. Further, in the example
shown in the drawings, the bending portion 47a is singular but may be plural. For example, it can
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be formed to draw double to triple or more multiple rings.
[0049]
A gasket portion 47 b as an attachment portion is connected to the outer periphery of the curved
portion 47 a in the diaphragm edge portion 47. The gasket portion 47b has an oval or oval shape
whose inner peripheral edge has the same shape as the outer peripheral edge of the curved
portion 47a, but the outer peripheral edge has a shape in which four corners of an elongated
rectangle are cut off obliquely It is. The gasket portion 47 b is made of, for example, a material
having flexibility such as EVA (ethylene-vinyl acetate copolymer resin), and the rear surface
thereof is the diaphragm housing opening 32 a formed in the front wall portion 32 of the frame
31. It is fixed by adhesive or the like around the inner peripheral edge and attached. Thereby, the
diaphragm 45 is held by the front wall 32 of the frame 31 without being disturbed.
[0050]
In the present embodiment, as shown in the figure, the sub-bobbin 51 is a tubular member
having an oval or oval ring-like shape with a cross-sectional shape having a major axis and a
minor axis, and is linear and parallel to each other And a corner portion 51b connecting both
ends of the straight portion 51a. The sub-bobbin 51 can be formed, for example, by bending an
elongated strip plate member into a ring and connecting both ends to each other.
[0051]
Further, as shown in FIG. 6B, a plurality of (for example, four) cuts 44a are formed at the front
end of the bobbin 44, and the straight portion 51a of the sub-bobbin 51 is inserted into the cuts
44a. The depth of the cut 44 a from the front end edge of the bobbin 44 substantially matches
the dimension in the front-rear direction of the sub-bobbin 51. Thus, with the sub-bobbin 51
attached to the bobbin 44, the front end edge of the bobbin 44 and the front end edge of the subbobbin 51 become flush. The bobbin 44 and the sub-bobbin 51 are fixed to each other by an
adhesive or the like.
[0052]
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15
Since the front end edge of the bobbin 44 and the front end edge of the sub-bobbin 51
assembled in this way are in contact with and fixed to the rear surface of the diaphragm 45 of
the diaphragm unit 46, the vibration of the coil 43 passes through the bobbin 44 and the subbobbin 51. And transmitted to the diaphragm 45. Specifically, the front end edge of the bobbin
44 and the front end edge of the sub-bobbin 51 abut on the rear surface of the recess 45 b which
is a portion projecting rearward, and are fixed by an adhesive or the like. A portion of the front
end edge of the bobbin 44 and the front end edge of the sub-bobbin 51 corresponding to the
rear surface of the convex portion 45 a is not in contact with the diaphragm 45 and is not fixed.
[0053]
Further, the dimension in the width direction of the sub-bobbin 51, that is, the distance between
the pair of opposing straight portions 51a is opposite in the second concave portion 45b2
shaped like an oval or oval ring having a major axis and a minor axis. It is set to be substantially
equal to the distance between the pair of linear portions. As a result, the entire front end edge of
the straight portion 51a of the sub-bobbin 51 abuts on and is fixed to the rear surface of the
linear portion of the second recess 45b2. Therefore, the sub-bobbin 51 abuts on and is fixed to
the diaphragm 45 over the wide range of the diaphragm 45, and the vibration is transmitted to
the wide range of the diaphragm 45.
[0054]
Further, in the portion where the corner portion 51b of the sub-bobbin 51 abuts and is fixed to
the rear surface of the first recess 45b1, the portion of the diaphragm 45 is fixed more than the
portion where the bobbin 44 is abutted and fixed to the rear Away from the longitudinal center.
Therefore, the sub-bobbin 51 abuts on and is fixed to the diaphragm 45 over the wide range of
the diaphragm 45, and the vibration is transmitted to the wide range of the diaphragm 45.
[0055]
As shown in FIG. 5C, the diameter of the bobbin 44 which is a cylindrical member is D, the
dimension in the longitudinal direction of the sub-bobbin 51 which is an elongated member is l,
and the diaphragm 45 which is an elongated plate member is Assuming that the longitudinal
dimension is L, the value of l is typically l 典型 2D, and L / 3 ≦ l ≦ L / 2.
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[0056]
If it is attempted to transmit vibration to a wide range of the diaphragm 45 which is an elongated
plate-like member without using the sub-bobbin 51, two driver units 40 each including the
bobbin 44 are arranged in the longitudinal direction of the diaphragm 45. It is conceivable to
arrange them side by side.
In this case, it is considered that the respective bobbins 44 or the driver units 40 are disposed at
positions where they are equally divided in the longitudinal direction of the diaphragm 45. That
is, the distance between the centers of two adjacent bobbins 44 is about L / 3, and the distance
between the distal ends of the two adjacent bobbins 44 is about L / 3 + D.
[0057]
Therefore, assuming that L / 3 ≦ l ≦ L / 2, vibration is applied to the diaphragm 45 over the
same range as when two driver units 40 not provided with the sub bobbin 51 are arranged side
by side by the sub bobbin 51. It can be said that it can be transmitted.
[0058]
Furthermore, the sub-bobbin 51 is a tubular member having an oval or oval cross-sectional shape
as described above, that is, a member having a closed cross-section.
Therefore, since the rigidity of the entire sub-bobbin 51 is high, the vibration is faithfully
transmitted to a wide range of the diaphragm 45.
[0059]
Further, as shown in FIG. 3B, the rear wall 13 of the housing 11 is formed with a pair of
communication passages 15c extending in the longitudinal direction of the rear wall 13. One end
of the communication passage 15 c is connected to the tone control hole 15 b of the end wall
portion 15, and the other end is in communication with a closed space formed between the
housing 11 and the frame 31. Therefore, the sound pressure in various frequency bands can be
controlled by adjusting the length, cross sectional shape, size of the cross section, etc. of the
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sound quality adjustment hole 15 b and the communication passage 15 c. As a result, even if the
space between the housing 11 and the frame 31 as a closed enclosure, that is, the volume of the
space functioning as an acoustic space is small, the performance of the speaker device 10 is
sufficiently exhibited in a desired frequency band. be able to.
[0060]
Furthermore, the rear end surface of the unit case 40a is exposed to the outside through the
driver unit corresponding opening 13a. Therefore, the heat generated by the driver unit 40 can
be efficiently released from the rear end surface of the unit case 40a, so that the speaker device
10, particularly the driver unit 40, can be prevented from being overheated.
[0061]
As described above, in the present embodiment, the speaker device 10 includes the flat
diaphragm 45 and the driver unit 40 that vibrates the diaphragm 45. The diaphragm 45 has a
narrow and elongated planar shape. The driver unit 40 includes a coil 43 generating vibration, a
bobbin 44 transmitting the vibration of the coil 43 to the diaphragm 45, and a sub-bobbin 51
attached to the bobbin 44. The bobbin 44 is a rear surface of the diaphragm 45 The sub-bobbin
51 abuts on the rear surface of the diaphragm 45 over a range wider than the bobbin 44 in the
longitudinal direction of the diaphragm 45.
[0062]
Thereby, since the vibration generated by the coil 43 can be effectively transmitted to the entire
diaphragm 45, the depth dimension of the speaker device 10 can be reduced, and even if the
narrow and narrow front shape is adopted, the width direction can be obtained. Can be
controlled, sound pressure can be controlled in a wide frequency band, sharp bass and clear
medium / high tone can be reproduced, sound reproducibility is good, and the speaker is high in
sound quality An apparatus 10 can be provided.
[0063]
Further, the diaphragm 45 is provided with a recess 45 b that protrudes rearward, and the front
end edge of the bobbin 44 and the front end edge of the sub bobbin 51 abut on the rear surface
of the recess 45 b.
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Thereby, the vibration of the coil 43 is faithfully transmitted to the diaphragm 45 via the bobbin
44 and the sub-bobbin 51.
[0064]
Furthermore, the bobbin 44 is a cylindrical member extending forward from the front end of the
coil 43, and the sub-bobbin 51 is a member having a closed cross-section attached to the front
end of the bobbin 44.
As a result, the rigidity of the bobbin 44 and the sub-bobbin 51 is enhanced, and the vibration of
the coil 43 is faithfully transmitted to the diaphragm 45. In addition, rolling of the bobbin 44 and
the coil 43 can be prevented.
[0065]
Further, the sub-bobbin 51 is a cylindrical member including flat straight portions 51a linearly
extending parallel to one another and corner portions 51b respectively connecting both ends of
the straight portion 51a, and the concave portions 45b are a pair of straight lines And the entire
front end edge of the straight portion 51a abuts on the rear surface of the straight portion.
Therefore, the sub-bobbin 51 abuts on and is fixed to the diaphragm 45 over the wide range of
the diaphragm 45, and the vibration is transmitted to the wide range of the diaphragm 45.
[0066]
Further, the dimension in the longitudinal direction of the sub-bobbin 51 is 1/3 to 1/2 of the
dimension in the longitudinal direction of the diaphragm 45. Thus, the vibration can be
transmitted to the diaphragm 45 over the same range as in the case where two driver units 40
not having the sub-bobbin 51 are arranged side by side.
[0067]
The present invention is not limited to the above-described embodiment, and can be variously
modified based on the spirit of the present invention, and they are not excluded from the scope
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of the present invention.
[0068]
The present invention can be applied to a speaker device.
[0069]
DESCRIPTION OF SYMBOLS 10 Speaker apparatus 11 Housing 12, 33 Side wall part 13 Back
wall part 13a Driver unit corresponding ¦ compatible opening part 15, 35 End wall part 15a, 35d
Engaging part 15b Sound quality adjustment hole 15c Communication path 31, 831 Frame 32
Front wall part 32a Diaphragm Housing opening 34 Driver unit housing 35a Mounting portion
35b Fixing plate 35c Mounting opening 36 Connection member 36a Rib 40 Driver unit 40a Unit
case 41, 841 Magnet 42 Plate 43 Coil 44, 844 Bobbin 44a Notch 45, 846 Diaphragm 45a
Convex part 45b Concave part 45b1 First concave part 45b2 Second concave part 46 Diaphragm
unit 47, 847 Diaphragm edge part 47a Curved part 47b Gasket part 51 Sub-bobbin 51a Straight
part 51b Corner part 52 Code 837 Basket 842a bottom plate 842b top plate 842c center-Pol843 voice coil 848 damper 851 drive cone
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