JP3505999B2 - Electroacoustic transducer - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an electroacoustic transducer which is a flat speaker.

[0002]

2. Description of the Related Art FIGS. 2A and 2B are views for explaining a conventional electroacoustic transducer. FIG. 2A is a front view of the electroacoustic transducer and FIG. 2B is a right side surface of the electroacoustic transducer. Sectional view, Figure 3
FIG. 3A is a diagram for explaining a diaphragm that constitutes an electroacoustic transducer, FIG. 1A is a front view of the diaphragm, and FIG. 2B is a vertical cross-sectional view of the diaphragm taken along the line AA ′. FIG. 4 is a diagram for explaining a damper that constitutes the electroacoustic transducer.

As shown in FIGS. 2 (A) and 2 (B), the full-drive thin speaker unit A, which is an electroacoustic transducer, has a frame 1, a rear plate 2, a magnet 3, a pole piece 4, a guide pin 5, and a boil. The coil 6, a diaphragm (vibration plate) 7, a damper 8, and an edge 9 are generally included. By increasing the combination (segment) of the magnet 3, the boil coil 6, and the diaphragm (vibration plate) 7, it is possible to increase the vibration plate area. The dimensions of the speaker unit A are, for example, 25 mm in thickness,
The width is 115 mm and the height is 136 mm, the maximum amplitude is 10 mmp-p (at 600 gf), and the withstand input power is 60 W. The boil coil 6 is shown for convenience of illustration.
Although only a part thereof is shown in FIG. 2 (B), as will be described later, the tops 7a1 to 7a7 of the vibrating plate 7 are formed.
Each is tightly wound around the bottom of the.

The frame 1 is a frame made of a heat resistant resin such as an ultra heat resistant ABS resin. The frame 1 is screwed and fixed to a speaker cabinet (not shown) through screw holes 1A to 1D provided at its four corners (the speaker cabinet has a thickness of 60 mm and a width of 1 mm, for example).
20 mm, height 500 mm). Further, the rear plate 2 is firmly screwed and fixed to the entire back surface of the frame 1, while four dampers 8 are adhesively fixed to the four corners on the front side (vibration plate 7 side) thereof. Vibration plate 7 with these four dampers 8
It supports the four corners of the so that it can vibrate freely.

The rear plate 2 is formed of a metal plate such as iron, and is a base plate for fixing the elongated magnets 3 having the elongated pole pieces 4 bonded to the upper surface thereof. A large number of air vent slits / holes are provided on the entire rear surface of the rear plate 2, and a pair of speaker terminals connected to the start end and the end of the boil coil 6 are provided (neither is shown). On the other hand, on the front side (the vibrating plate 7 side) of the rear plate 2, both ends of the long pole piece 4 to which the long magnet 3 is adhered are fixed by screws with the guide pins 5, as described above. In the illustrated example, seven longitudinal magnets 3 are arranged in parallel with each other.

The magnet 3 is a magnet made by sintering ferrite such as strontium ferrite. Then, as described above, when the magnet 3 is fixed to the front side of the rear plate 2 (the vibrating plate 7 side), one surface of the magnet 3 contacting the rear plate 2 becomes the N pole, while the magnet contacting the pole piece 4 The magnet 3 is magnetized so that the other surface of the magnet 3 (on the side of the vibration plate 7) has an S pole. The magnet 3 has, for example, a length of 80 mm, a width of 5 mm, and a thickness of 8 mm.

The pole piece 4 is formed of a metal plate such as iron and has a pair of screw holes for fixing the magnet 3 to the rear plate 2 at both ends thereof. The boil coil 6 includes the tops 7a1 to 7a7 of the diaphragm 7.
Is a coated copper wire which is sequentially wound around the circumference of. As described above, a pair of speaker terminals provided on the rear plate 2 are connected to the start end and the end (not shown) of the boil coil 6, respectively. Details of winding the boil coil 6 around the tops 7a1 to 7a7 of the diaphragm 7 will be described later.

The diaphragm (vibration plate) 7 is formed by integrally molding a polyimide (PI) film that is resistant to heat generation of the boil coil 6 and has excellent mechanical characteristics as a vibration plate. In order to reduce the weight of the diaphragm 7,
Although it is necessary to make the diaphragm itself as thin as possible, the thickness of the diaphragm 7 used here is 75 μm. As described above, the vibrating plate 7 is attached to the magnet 3 and the pole piece 4 fixed on the rear plate 2, and the periphery thereof is positioned and fixed to the frame 1 by the edge 9 made of urethane or the like.

The damper 8 is a diaphragm 7 whose entire periphery is firmly adhered and fixed in the frame 1 by using an edge 9.
Is oscillatably supported (locked) in the frame 1, and is made of a thermoplastic resin such as polycarbonate, which is a material having high spring properties, high impact resistance, and high heat resistance. In order to obtain a maximum amplitude of 10 mmp-p in a limited space, a multi-stage leaf spring structure is used. This damper 8 is 4
Since the four corners of the diaphragm 7 are supported by the four corners of the frame 1 by using one of them, a displacement of 10 mmpp is achieved at 150 gf for each damper 8. The load is supported by the structure of four supporting beams at both ends. Furthermore, the tensile load in the surface direction of the diaphragm 7 is taken up by the connecting portion at the center of the damper 8. The beam structure is arranged in a fan shape to save space. In addition to the above, the damper 8 can also be formed of a soft member such as foamed plastic, cloth sealed with plastic, or a metal member.

As shown in FIG. 4, the structure of the damper 8 described above includes a frame engaging portion 8a and a spring supporting portion (connecting portion) 8
b, 8c, a diaphragm locking portion 8d, and a connecting portion 8e. The frame locking portions 8a are locked at the four corners of the frame 1, respectively. The spring support portion 8b connects one end of each of the two spring portions 8b1 (or one end of each of the two spring portions 8b2). The spring support portion 8c connects the respective one ends of the two spring portions 8c1 (or the respective one ends of the two spring portions 8c2). The diaphragm locking portions 8d are locked at the four corners of the diaphragm 7, respectively.
The connecting portion 8e is the central portion of the frame mounting portion 8a and the spring portion 8b.
1 and 8b2, the other ends of the spring portions 8c1 and 8c2,
The central portion of the diaphragm locking portion 8d is integrally connected. The spring portions 8b1, 8b2, 8c1, 8c2 described above are thinner than the spring supporting portions 8b, 8c and the connecting portion 8e.
As a result, a multi-stage leaf spring structure is formed between the spring supporting portions 8b and 8c and the connecting portion 8e, so that the connecting portion 8e serves as a beam and the two spring supporting portions 8b and 8c and the diaphragm locking portion are formed. 8d can be freely displaced in the vibration direction of the diaphragm 7.

The edge 9 firmly adheres and fixes the vibrating plate 7 all around the vibrating plate 7 so that the vibrating plate 7 can be uniformly vibrated by a voice signal (driving current). The edge 9 is formed of a soft member such as foamed plastic or cloth sealed with plastic, and is normally firmly attached and fixed to the frame 1. As the adhesive used for adhering the diaphragm 7 to the edge 9, epoxy resin or rubber adhesive is often used. In some cases, a thermosetting adhesive of the same type may be used for heating and pressurizing.

By the way, the above-mentioned diaphragm 7 is shown in FIG.
As shown in (B), a plurality of elongated tops 7a1-7
a7, a flat surface portion 7b, and an outer peripheral portion 7c. The tops 7a1 to 7a7, the flat surface portion 7b, and the outer peripheral portion 7c are integrally molded. Further, the tops 7a1 to 7a7 are formed in a curved surface convex shape (protrusion) from the back side (rear plate 2 side) of the vibration plate 7 toward the front side. Here, the front side of the vibrating plate 7 is the front side of the full-screen drive thin speaker unit A. The tops 7a1 to 7a7 are arranged in the longitudinal direction of the diaphragm 7 (see FIG. 2 (A),
7 in parallel in the vertical direction in FIG. 3 (A).
The cross-sectional shape of each apex 7a1-7a7 is as shown in FIG.
It has a convex shape (kamaboko shape, semi-cylindrical shape) cut along the line AA '. An outer peripheral portion 7c is formed around the main vibrating portion 7A.

In this way, by supplying the audio signal (driving current) between the pair of speaker terminals of the whole-surface driving thin type speaker unit A having the above-mentioned configuration, the respective tops 7a1 to 7a7 of the diaphragm 7 with respect to the paper surface. The whole surface will vibrate evenly in the front and back.

[0014]

As described above, the tops 7a1 to 7a7 arranged in parallel on the vibration plate 7 are described above.
When a driving current is supplied to the voice coil 6 wound around the above, the driving force is different between the both ends 7aa and 7ab of the tops 7a1 to 7a7 and the central portion 7ac thereof. As a result, the main vibrating portion 7A serves as the top portion 7a1.
~ 7a7 does not vibrate together. That is, the tops 7a1-7
The a7s have different displacement responses. In other words, four dampers 8 are used to make the diaphragm 7
Since only the four corners of the
Since unnecessary displacement response generated near both ends 7aa and 7ab of 7a7 cannot be effectively removed, as a result, the above-described conventional full-drive thin speaker unit A obtains a flat sound pressure frequency characteristic in the middle range. I couldn't.

In order to solve the problem that a flat sound pressure cannot be obtained in the entire frequency band, the present invention divides a flat diaphragm into a plurality of parts in a direction orthogonal to the longitudinal direction of each apex. It is composed of divided parts, and both ends of each top are provided and the locking part that locks the whole diaphragm part is provided. It is an object of the present invention to provide an electroacoustic transducer capable of obtaining a flat sound pressure.

[0016]

In order to solve the above problems, the present invention provides an electroacoustic transducer having the following configurations (1) and (2).

(1) As shown in FIG. 1, there is provided a flat plate-shaped diaphragm 700 in which a plurality of elongated protrusions (tops) 700a1 to 700a5 are arranged in parallel. (Part) 700a1 to 700a5 are convex
Both end portions (split portions of T10, U10, V10, W10,
X10 and divided parts T90, U90, V90, W9
0, X90) and a plurality of divided portions T10 to T90, U10 to U90, which are divided in a direction orthogonal to the longitudinal direction thereof.
A vibrating plate 700 having V10 to V90, W10 to W90, and X10 to X90, a frame body (frame) 10 for vibratably attaching and fixing the vibrating plate 700, and the frame body 10 fixed inside the frame body (frame) 10. One and the other of each of the protrusions (tops) 700a1 to 700a5 of the diaphragm 700
One end (that is, divided portions T10, U10, V10, W
10, X10, or divided parts T90, U90, V
90, W90, X90) respectively , and both ends (that is, divided portions T10, U10, V10, W10, X) of the plurality of protrusions (tops) 700a1 to 700a5 are locked.
10 and divided parts T90, U90, V90, W9
A pair of dampers 80 (8
0A, 80B), and an electro-acoustic transducer (entire drive thin speaker unit) BB.

(2) In the electroacoustic transducer according to the above (1), each of the dampers 80 (80A, 80B) is
U10, V10, W10, X10 or the first locking portion having a shape (multi-step inverted chevron shape) complementary to the shape (multi-step chevron shape) of the divided portions T90, U90, V90, W90, X90). 80aa and the first locking portion 80
a second locking part 80ab having a shape that can be fitted to the frame body (frame) 10 while holding the first locking part 80aa by connecting to a part of aa. Electro-acoustic transducer. All the ends of one side of the plurality of protrusions of the diaphragm 700 (that is, the divided portions T10,

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION An electroacoustic transducer of the present invention will be described below with reference to the drawings. 1A and 1B are views for explaining an embodiment of the electroacoustic transducer of the present invention. FIG. 1A is a front view of the electroacoustic transducer, and FIG. 1B is a right side surface of the electroacoustic transducer. FIG. 5 is a cross-sectional view for explaining a damper that constitutes the electroacoustic transducer of the present invention. The same components as those described above are designated by the same reference numerals, and the description thereof will be omitted.

The whole-drive thin speaker unit BB, which is the electroacoustic transducer of the present invention, has substantially the same configuration as the speaker unit A shown in FIGS. 2 and 3 described above, and particularly, the shape of the diaphragm and the damper. The configuration is the same as the conventional one except that the shape is changed. In the following description, only the diaphragm 700 and the damper 80 will be described.

Full-drive thin speaker unit B of the present invention
As shown in FIG. 1, B is a frame 10 having the same structure as that of the frame 1 and having screw holes 10A to 10D, and a rear plate 20 having the same structure as the rear plate 2, a magnet 3, and a pole piece 4. , Guide pin 5, boil coil 6, diaphragm (vibration plate) 700, damper 8
0, an edge 9 (for convenience of illustration, the magnet 3, the pole piece 4, and the guide pin 5 are not shown). The same components as those described above are designated by the same reference numerals and the description thereof will be omitted.

The vibrating plate 700 includes five tops 700a1.
.About.700a5 in the direction orthogonal to the longitudinal direction (vertical direction in FIG. 1) of the eight dividing lines a10 to a50 serving as nodes.
b10-b50, c10-c50, d10-d50, e
10-e50, f10-f50, g10-g50, h1
It is a plurality of divisions (9 divisions) from 0 to h50.

The diaphragm 700 has the same structure as the diaphragm 7 described above. That is, a polyimide (PI) film that is resistant to heat generation of the boil coil 6 and has excellent mechanical characteristics as a diaphragm is integrally molded. Further, in order to reduce the weight of the diaphragm 700, it is necessary to make the diaphragm itself as thin as possible, but the thickness of the diaphragm 700 used here is 75 μm. The diaphragm 700 is attached to the magnet 3 and the pole piece 4 fixed on the rear plate 20, and the periphery thereof is positioned and fixed to the frame 10 by the edge 9 made of urethane or the like.

The vibrating plate 700 includes a plurality of elongated tops 700a1 to 700a formed in the longitudinal direction of FIG.
00a5, a plane portion 700b, and an outer peripheral portion 700c, and these apex portions 700a1 to 700a5 and the plane portion 70.
0b and the outer peripheral portion 700c are integrally molded. In the figure, the tops 700a1 to 700a5 are integrally formed on the diaphragm 700, and the number thereof is five.

The top portions 700a1 to 700a5 are divided lines a10 to a50, b10 to b50, c10 to c that serve as nodes in a direction (horizontal direction in FIG. 1) orthogonal to the longitudinal direction thereof.
50, d10 to d50, e10 to e50, f10 to f5
It is divided into 0, g10 to g50, and h10 to h50, respectively. These dividing lines a10 to a50, b10 to b5
0, c10-c50, d10-d50, e10-e5
0, f10-f50, g10-g50, h10-h50
Is not just a straight line, but the tops 700a1 to 700a
It is a line concave portion (or rib-shaped line) formed by pressing and molding a5, whereby concave and convex ribs having a narrow width are formed, whereby rigidity is enhanced. The number of the dividing lines is the summit 700a1 to 700a5.
8 are provided in the horizontal direction.

Specifically, the top 700a1 has eight dividing lines a10, b10, c10, d10, e10, f1.
It is divided into 9 divided parts T10 to T90 at 0, g10 and h10. Similarly, the top 700a2 has eight dividing lines a2
0, b20, c20, d20, e20, f20, g2
It is divided into nine divided parts U10 to U90 at 0 and h20, and the top 700a3 has eight dividing lines a30, b30, and c3.
0, d30, e30, f30, g30, and h30 are divided into 9 divided parts V10 to V90, and the top 700a4 is 8
Book division lines a40, b40, c40, d40, e40,
9 in divided parts W10 to W90 at f40, g40, and h40
And the top 700a5 is divided into eight dividing lines a
50, b50, c50, d50, e50, f50, g5
It is divided into 9 divided parts X10 to X90 at 0 and h50.
When these divided parts are attached to the damper 80, the divided parts T10 at both ends of the tops 700a1 to 700a5,
U10, V10, W10, X10, T90, U90, V
90, W90 and X90 are preferably convex. In addition, the divided portion T5 in the central portion of the tops 700a1 to 700a5
0, U50, V50, W50, and X50 are also preferably convex. The reason is that each of the tops 700a1 to 700a5 is divided into odd numbers.

The above-mentioned dividing line a10-b10-c10-
Each spacing of d10-e10-f10-g10-h10, dividing line a20-b20-c20-d20-e20-f20
-Each interval of g20-h20, division line a30-b30-c
30-d30-e30-f30-g30-h30 intervals, dividing line a40-b40-c40-d40-e40-
Each spacing of f40-g40-h40, division line a50-b5
0-c50-d50-e50-f50-g50-h50
Although the respective intervals are equal as shown in FIG. 6, it is needless to say that the intervals can be appropriately set as necessary in order to obtain the desired characteristics. It should be noted that, as described above, if the intervals between the adjacent dividing lines are made uniform, it is advantageous in manufacturing the diaphragm 700 as well. However, even if the intervals are not made uniform, it is sufficient if rigidity is secured. .

Of the divided portions T10 to X90 constituting the above-mentioned tops 700a1 to 700a5, the divided portion T1
0, T30, T50, T70, T90, U10, U3
0, U50, U70, U90, V10, V30, V5
0, V70, V90, W10, W30, W50, W7
0, W90, X10, X30, X50, X70, X90
Is formed on the flat surface portion 700b in a semi-cylindrical shape (semi-cylindrical shape, convex shape) in cross section.

On the other hand, the above-mentioned tops 700a1 to 700
Of the divided parts T10 to X90 forming a5, the divided parts T20, T40, T60, T80, U20, U40,
U60, U80, V20, V40, V60, V80, W
20, W40, W60, W80, X20, X40, X6
0 and X80 are formed on the flat surface portion 700b in a curved shape (a shape opposite to the top portion of the above-mentioned kamaboko shape, a concave shape) which is a cross-sectional shape complementary to the above-mentioned kamaboko shape.

As described above, since the adjacent divided portions are shaped so as to be complementary to each other, the apex 700a
1 to 700a5 increases mechanical strength (rigidity) with respect to a force applied perpendicularly to the longitudinal direction (or a force orthogonal to the longitudinal direction), so that the divided portions adjacent to each other do not vibrate uniformly, When one tries to start vibrating larger or smaller than the other, it is possible to complementarily prevent the generation of this vibration component.

As a result, the tops 700a1 to 700a5
In the divided portions T10 to X90, the kamaboko-shaped divided portions and the curved-shaped divided portions are alternately arranged adjacent to each other in the longitudinal direction. Such tops 700a1
700a5 forms the main vibration part 700A. Four outer peripheral portions 700c are formed on the four circumferences of the main vibrating portion 700A. The vibrating plate 700 having such a structure has a thickness of synthetic resin whose hardness is relatively unaffected by temperature such as polyelter, polyethylene, polypropylene, etc.
It may be formed of a film of about m or a member such as a composite fill in which a plurality of such films are laminated.

By the way, the damper 80 described above uses the edge 9 in the same manner as the damper 8 described above.
Vibration plate 7 whose entire circumference is firmly bonded and fixed in 0
00 is vibratably supported (locked) in the frame 10, and is made of a thermoplastic resin such as polycarbonate, which is a substance having high spring property, high impact resistance and high heat resistance. Maximum amplitude 10mmp-p in limited space
In order to obtain the above, a plate spring structure and a support beam structure at both ends are provided, and one pair (two) of this damper 80 is used (using the dampers 80A and 80B), and the upper and lower sides of the frame 10 and both ends thereof. 1, the upper and lower sides of the diaphragm 700 and the respective ends thereof (the upper and lower two sides of the diaphragm 700 and the left and right sides thereof in FIG. 1). Both end portions) can be securely locked and supported together. Each damper 80 (damper 80A, 80B) has a displacement of 10 mmp-p at 150 gf. Further, the tensile load in the surface direction of the diaphragm 700 is reduced by the damper 8
0 (damper 80A, 80B) is a structure in which it is handled by the connecting portion at the center. In addition to the above, the damper 80 can also be formed of a soft member such as foamed plastic, cloth sealed with plastic, or a metal member.

The damper 80 (80A, 80B) described above
The structure of the frame attaching portion 80a, as shown in FIG.
Four spring parts 80b1, 80b2, 80c1, 80c
2, the diaphragm locking portion 80d and the connecting portion 80e. The frame attachment portion 80a is a U-shaped frame that is locked to the upper side and the lower side of the frame 10, respectively. The frame attachment portion 80a connects and locks one end of each of the two spring portions 80b1 and one end of each of the two spring portions 80b2. The diaphragm locking portion 80d is locked to the upper side and the lower side of the diaphragm 700, respectively. The vibration plate locking portion 80d includes two spring portions 8
Each end of 0c1 and each end of two spring parts 80c2 are connected and locked. The connecting portion 80e is connected to each other end of the two spring portions 80b1 and each other end of the two spring portions 80b2, and each other end of the two spring portions 80c1 and the two spring portions 8 are connected.
It connects to each other end of 0c2. In addition, the spring portion 80 described above
The thicknesses of b1, 80b2, 80c1 and 80c2 are thinner than the thickness of the frame mounting portion 80a, the diaphragm locking portion 80d, and the connecting portion 80e. As a result, the frame mounting portion 80a,
Since a two-stage leaf spring structure is generated between the diaphragm locking portion 80d and the connecting portion 80e, the diaphragm locking portion 80d is freely displaced in the vibration direction of the diaphragm 700 by using the connecting portion 80e as a beam. It can be locked as much as possible.
As described above, the frame mounting portion 80a and the spring portion 8 described above are provided.
0b1, 80b2, the connecting portion 80e, the damper 80 (8
0A, 80B) constituting a second locking portion 80ab. On the other hand, the above-mentioned spring parts 80c1, 80c2,
The vibration plate locking portion 80d is a damper 80 (80A, 80A).
The first locking portion 80aa that constitutes B) is configured.

The vibrating plate locking portion 80d is used for the vibrating plate 7
The reverse arc-shaped locking portions 80d1 to 80d5 for locking the lower edges of the arc-shaped tops 700a1 to 700a5 of 00 are provided. The reverse arcuate locking portions 80d1 to 80d5 are integrally supported by the support portion 80d6. As described above, the damper 80 having such a configuration is used in the frame mounting portion 8
0a, the diaphragm locking portion 80d, and the connecting portion 80e form a two-stage leaf spring structure.
As a beam, the diaphragm locking portion 80d can be locked so that it can be freely displaced in the vibration direction of the diaphragm 700.

Thus, as described above, the damper 80 has upper and lower sides of the frame 10 and both end portions thereof (in FIG. 1, the frame 10 in comparison with the conventional case where the four dampers 8 are used for attachment). The diaphragm 700 can be securely locked and supported on the upper and lower two sides and the left and right ends thereof.

As a result, in the whole-surface-driving thin speaker unit BB, the rigidity of the diaphragm 700 in the width direction (vertical direction in FIG. 1) is further enhanced, and the diaphragm in the width direction (horizontal direction in FIG. 1). Since the divided vibration of 700 is further reduced, each of the tops 700a1 to 700a arranged in parallel on the diaphragm 700 is compared with the full-drive thin speaker unit A.
When a driving current is supplied to the voice coil 6 wound around a5, there is almost no difference in the driving force between the both ends of the tops 700a1 to 700a5 and the center thereof. As a result, the tops 700a1 to 7a005 are integrated. It will vibrate. In other words, the tops 700a1 to 700a5 do not generate split vibrations (split resonances) without permission, and can output the phase-matched sound in a planar form anywhere on the diaphragm 700. As a result, the high frequency component in the sound pressure frequency characteristic of the above-described full-surface drive thin speaker unit AA can be reproduced with good S / N.

[0037]

According to the electroacoustic transducer of the present invention having the above-described structure, in particular, all the ends on one side of the plurality of protrusions of the vibration plate mounted and fixed in the frame body are respectively locked, and Since a pair of dampers for restricting vibrations at both ends of the plurality of protrusions are provided by fitting and fixing the diaphragm, the driving force of the diaphragm becomes uniform over the entire surface.
Since it is possible to prevent the generation of undesired vibrations such as different displacement responses, it is possible to obtain a flat sound pressure in the entire frequency band by vibrating the top part as the main vibration part. There is.

[Brief description of drawings]

FIG. 1 is a diagram for explaining an embodiment of an electroacoustic transducer of the present invention.

FIG. 2 is a diagram for explaining a conventional electroacoustic transducer.

FIG. 3 is a diagram for explaining a diaphragm that constitutes an electroacoustic transducer.

FIG. 4 is a diagram for explaining a damper that constitutes the electroacoustic transducer.

FIG. 5 is a diagram for explaining a damper that constitutes the electroacoustic transducer of the present invention.

[Explanation of symbols]

1,10 Frame (frame body) 7,700 Vibration plates 7a1 to 7a7, 700a1 to 700a5 Tops (projections) 8,80,80A, 80B Dampers 80aa, 80ab First and second locking parts 80d Vibration plate member Stop portions 80d1 to 80d5 Reverse arc-shaped locking portions A, BB Full-surface drive thin speaker unit (electroacoustic transducer) a10 to a50, b10 to b50, c10 to c50, d
10-d50, e10-e50, f10-f50, g1
0-g50, h10-h50 Dividing lines T10-T90, U10-U90, V10-V90, W
10-W90, X10-X90 Divided part

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04R 9/00 H04R 7/12

Claims (2)

(57) [Claims] 1. A longitudinal shaped plurality of projecting portions flat diaphragm which is arranged in parallel, each of the respective protrusions,
A vibrating plate having both convex end portions and a plurality of divided portions in a direction orthogonal to the longitudinal direction of the vibrating plate, a frame body for vibratably attaching and fixing the vibrating plate, and a frame body for attaching and fixing the vibrating plate to the frame body. An electroacoustic transducer comprising: a pair of dampers that lock one end and the other end of each of the protrusions of the diaphragm to restrict vibrations at both ends of the plurality of protrusions. . 2. The electroacoustic transducer according to claim 1, wherein each of the dampers has a shape complementary to a shape of all end portions on one side of the plurality of protrusions of the diaphragm. An engaging portion, and a second engaging portion which is connected to a part of the first engaging portion to hold the first engaging portion and which has a shape fittable with the frame body. An electro-acoustic transducer characterized by that.