JP3297778B2 - Speaker device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loudspeaker device, and particularly to a loudspeaker device using an electrostatic loudspeaker.

[0002]

2. Description of the Related Art In an electrostatic speaker, a sound pressure corresponding to a drive signal can be generated by separately applying a polarization voltage in addition to the drive signal. That is,
As shown in FIG. 18, in a speaker device 1 using an electrostatic speaker, a drive signal output from a power amplifier 2 is boosted several tens times by a boost transformer 3 and an output signal of the boost transformer 3 is converted to a speaker element. 4 is output.

Here, the speaker element 4 is provided with fixed electrodes 5 and 6 having a plurality of through holes formed in a metal plate, and an output signal of the step-up transformer 3 is applied between the fixed electrodes 5 and 6. Will be. Further, a vibration film 7 is formed on the speaker element 4 by applying a conductive thin film to a polyester film, for example, and is held between the fixed electrodes 5 and 6.

[0004] The speaker device 1 is
The boosting power source boosts the commercial power to form a polarizing voltage of several kV, and applies the polarizing voltage between the secondary intermediate tap of the boosting transformer 3 and the vibrating membrane 7.
At this time, the polarized voltage forming power supply 8 applies a polarized voltage to the diaphragm 7 via the resistor 9 having a predetermined resistance value, thereby setting the electric charge Q to a predetermined value for the entire speaker device 1.

Thus, in the speaker device 1,
For the vibrating membrane 7,

(Equation 1) Is generated, and the vibration film 7 is elastically vibrated with the driving force F to generate a sound pressure corresponding to the driving signal. Here, ε represents the dielectric constant, in this case, the value is 8.85 × 10 ⁻¹² [F / N], S is the electrode area [m ² ], E0 and E are the polarization voltage [V] and the driving signal, respectively. Voltage [V]. Also d0
Is the distance [m] between the electrodes.

[0006]

In such an electrostatic loudspeaker, a high precision is required as a clearance (C in the figure) between the fixed electrodes 5 and 6 and the diaphragm 7. Maintaining accuracy is not easy. In particular, coating is performed on the fixed electrodes 5 and 6 for pressure resistance and the like. However, it is inevitable that thickness unevenness occurs in this coating, and it becomes difficult to maintain the clearance C with high accuracy. As described above, since the clearance accuracy is required to be high, while maintaining the accuracy is difficult, there has been a problem that mass production of this kind of speaker by a so-called line process is very difficult.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its object to maintain the clearance between a fixed electrode and a vibrating body with high accuracy in an electrostatic speaker and to enable mass production. I do.

For this purpose, a drive signal is applied between a pair of fixed electrodes held so as to face each other, and a polarization voltage is applied between an electrode of the vibrating body held between the fixed electrodes and the fixed electrode. As a result, in the speaker device that generates sound pressure in accordance with the drive signal, the vibrating body is held by the frame.
It is configured to be held between the fixed electrodes while being held by the insulating spacers disposed on the fixed electrodes inside the frame body .

In this case, each fixed electrode is attached to a pair of frames, and the frame of the vibrating body is disposed between the pair of frames via an elastic body. The spacer is bonded to the fixed electrode, and the spacer is also bonded to the vibrator.

Further, each fixed electrode is attached to a pair of frame bodies, and one or both of the pair of frames forms a tapered surface as a surface that abuts on the other frame, and is used when joining the pair of frames. The end of the tapered surface is used as a fulcrum to apply a sandwiching force to a portion where the fixed electrode and the spacer are sandwiched.

[0011]

The clearance between the fixed electrode and the vibrating body is determined only by the spacer by holding the vibrating body directly sandwiched by the spacers arranged on the fixed electrode. The effect of thickness unevenness due to the coating of the fixed electrode does not appear on the clearance accuracy.

Further, since the vibrating body is directly pressed down by the spacer, the position accuracy of the vibrating body relative to the frame is in a free state. Here, the vibrating body is disposed in the frame via the elastic body. Thereby, the backlash of the frame can be suppressed.

Further, by attaching the spacer to the fixed electrode with, for example, an ultra-thin double-sided tape, the workability in the speaker assembly process is improved. Furthermore, by attaching the spacer to the vibrating body with, for example, an extremely thin double-sided tape, it is possible to prevent the vibrating body from wrinkling due to thermal expansion.

Further, a tapered surface is provided on the frame, and an end of the tapered surface serves as a fulcrum when the pair of frames are joined, so that a sandwiching force is structurally applied to the sandwiched portion between the fixed electrode and the spacer. The fixed electrode, the spacer, and the vibrating body are more reliably pressed and fixed, and the accuracy of the clearance between the fixed electrode and the vibrating body determined by the spacer is further improved.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the speaker device of the present invention will be described below with reference to FIGS. 1 to 13, and a second embodiment of the present invention will be described with reference to FIGS.

First, as a first embodiment, FIG. 1 is a perspective view of a speaker element of the electrostatic speaker device of the embodiment, and FIG. 2 is an exploded perspective view of the speaker element. In these figures, reference numeral 10 denotes the whole speaker element,
Reference numerals 0 and 30 denote a pair of frames serving as housings of the speaker elements. 40A and 40B are a pair of fixed electrodes, 5
Reference numerals 0A and 50B denote spacers corresponding to the fixed electrodes 40A and 40B, 60 denotes an elastic body, 70 denotes a metal frame on which the vibrating film 90 is attached, and 80 denotes a vibrating body electrode.

The components shown in FIG. 2 are joined by screws N or the like to form a speaker element 10 as shown in FIG.
The screw N ₁ is, for example, a small screw with a hexagonal hole, and
Elastic body 60 and metal frame 7 between
0, through which the vibrating body electrode 80 is inserted,
Screw holes (21, 31, 61, 71, 81) are provided at six positions corresponding to each of the frame 0, the frame 30, the elastic body 60, the vibrating body electrode 80, and the metal frame 70.

The screws N ₂ are for joining the frame 20 and the frame 30, and the screw holes 2 are provided at four corresponding positions in the frame 20 and the frame 30.
2, 32 are formed. Note that if the the respective components are adequately secured by screws N ₁ described above, the screw N
₂ is not always necessary, and in that case, the screw holes 22 and 32 need not be formed in the frame 20 and the frame 30 as a matter of course. From the viewpoint of mass production and cost reduction of an electrostatic speaker device it is preferable that not using screws N _2.

FIGS. 3A to 3G are a plan view, a right side view, a left side view, a front view, a bottom view, an AA sectional view, and a BB sectional view of the frame 20. FIG. The frame 20 is formed in a frame shape in which a sound pressure output hole 23 is formed in the center of the plane.

3 (e), 3 (f) and 3 (g), a step is formed around the bottom surface side of the sound pressure output hole 23, and the step is provided with a fixed electrode 40A. The fixed electrode arrangement part 24 is formed. Further, on the peripheral side of the wall 25 around the fixed electrode disposing portion 24, a circular groove 26 is formed. The depth of the step from the wall portion 25 to the fixed electrode placement portion 24 is the same as or shorter than the thickness of the fixed electrode 40A, and when the fixed electrode 40A is placed in the fixed electrode placement portion 24, The upper plane of the portion 25 is set so as not to be higher than the plane of the fixed electrode 40A.

Reference numeral 27 denotes when the fixed electrode 40A is arranged.
A deriving unit that derives a lead wire connected to the fixed electrode 40A, and a deriving unit that derives a lead wire of the vibrating body electrode 80. As shown in FIGS. 3E and 2, a cutout receiver 29 is provided on the bottom surface side of the frame 20 so as to protrude from the side surface to the groove 26. As will be described later, the notch receiver 29 functions as a positioning mechanism when the elastic body 60, the metal frame 70, and the vibrating body electrode 80 are arranged.

Next, a plan view and a right side view of the frame 30 will be described.
Left side view, front view, bottom view, CC cross section, and DD
Sectional views are shown in FIGS. The frame 30 is also formed in a frame shape in which a sound pressure output hole 33 is formed in the center of the plane.

4 (e), (f) and (g), a step is formed around the bottom surface of the sound pressure output hole 33, and the step is provided with a fixed electrode 40B. The fixed electrode arrangement part 34 is formed. 35 is a fixed electrode arrangement part 34
It is a wall part around. The depth of the step from the wall portion 35 to the fixed electrode disposition portion 34 is the same as or smaller than the thickness of the fixed electrode 40B, and when the fixed electrode 40B is disposed on the fixed electrode disposition portion 34, the wall portion 35 The upper plane is set so as not to be higher than the plane of the fixed electrode 40B.

Reference numeral 37 denotes when the fixed electrode 40B is arranged.
This is a lead-out unit that leads out a lead wire connected to the fixed electrode 40B.

FIGS. 5A to 5C are a plan view, a front view, and an EE cross-sectional view of the metal frame 70 to which the vibration film 90 is attached. The planar shape and size of the metal frame 70 are set to a shape and size that can be fitted into the circumferential groove 26 of the frame 20.

Then, on the upper surface side of the metal frame 70,
For example, a vibration film 90 formed by applying a conductive thin film to a polyester film is attached. Reference numeral 78 denotes a cutout portion formed in the frame 20 for escape to the cutout receiver 29.

FIGS. 6A and 6B are a plan view and a front view of the elastic body 60, respectively. The elastic body 60 is formed of, for example, a foamable resin, and has substantially the same planar shape and size as the metal frame 70, that is, can be fitted into the circumferential groove 26 of the frame 20. Further, a cutout portion 62 is formed for escape to the cutout receiver 29 formed in the frame 20.

FIGS. 7A and 7B are a plan view and a front view of the vibrating body electrode 80, respectively. The planar shape and size of the vibrating body electrode 80 are substantially the same as those of the metal frame 70, that is, the vibrating body electrode 80 can be fitted into the circumferential groove 26 of the frame 20. Then, when fitted into the groove 26, the frame 2
A notch 84 is formed for escape from the notch receiver 29 formed at zero. Also, the protruding portion 8 against the side
3 is provided, and the lead wire L _S is connected to this protruding portion. The lead wire L _S is a lead wire for applying the polarization voltage from the polarization voltage forming power supply in FIG.

FIGS. 8A and 8B show spacers 50A (50A).
FIG. 3B shows a plan view and a front view of FIG. The spacer 50A (50B) is formed into a circular shape as shown in FIG. 8 using, for example, a film-like resin. The outer peripheral size is substantially the same as the outer peripheral size of the wall portions 25, 35 in the frames 20, 30, and the inner peripheral size is smaller than the outer peripheral size of the fixed electrode.

FIGS. 9A and 9B are a plan view and a front view of the fixed electrode 40A (40B). Fixed electrode 40A (4
0B) is formed, for example, as a plate-shaped copper material having a large number of through holes 41 formed therein. Reference numeral 42 denotes a lead wire connecting portion to which a lead wire L _K for supplying an output of the boosting transformer 3 in FIG. 18 is connected.

These components are mounted in the frames 20, 30 as described below. First, FIG.
Of the fixed electrode arrangement part 2 with respect to the frame 20 shown in FIG.
The fixed electrode 40 </ b> A is attached on the top 4. That is, the peripheral portion of the fixed electrode 40 </ b> A is arranged on the fixed electrode arrangement portion 24. At this time, the lead wire connecting portion 42 of the fixed electrode 40A is fitted into the lead portion 27, and the lead wire L _K is led out of the frame 20. Then, the fixed electrode 40A whose peripheral portion is placed on the fixed electrode disposing portion 24 is exposed from the sound pressure output hole 23 except for the peripheral portion. FIG. 10 is a perspective view of the frame 20 to which the fixed electrode 40A is attached, as viewed from the inside.

As can be seen from FIG. 10, the elastic body 60 is fitted into the groove 26 of the frame 20.
At this time, the notch 62 of the elastic body 60 corresponds to the notch receiver 29 protruding into the groove 26 of the frame 20,
The elastic body 60 is fitted and arranged in the positioned state.

Then, as shown in FIG.
The spacer 50 is fixed to the fixed electrode 40A attached to the
A is adhered. For this bonding, for example, an extremely thin double-sided tape is used. The ultra-thin double-sided tape is, for example, prepared by providing a release layer 101 with respect to the adhesive layer 100 as shown in FIG. 11. By peeling the release layer 101, both sides can be used as an adhesive tape. . In this case, the thickness of the adhesive layer 100 is preferably about 25 μm. Examples of such a double-sided tape include “Sony Bond Film” manufactured by Sony Chemical Corporation.
T4100 -25 "the like.

Such a double-sided tape is attached to one surface of the spacer 50A, and is adhered and fixed from the wall 25 of the frame 20 to the peripheral edge of the fixed electrode 40A in FIG. That is, as shown in FIG.
The spacer 50A is adhesively fixed on (and the wall 25).

Further, as can be seen from FIG.
The metal frame 70 with the vibration film 90 attached to the groove 26 of the frame 20 is fitted from the side where the vibration film 90 is not attached. In other words, a state in which the metal frame 70 is placed on the elastic member 60 in FIG. 1 0. At this time,
The position of the notch 78 of the metal frame 70 is made to correspond to the notch receiver 29 of the frame 20, and the arrangement direction and the position are determined. In the state of FIG.
In other words, the vibration film 90 is disposed on the uppermost surface in the area of 0.

At this time, the spacer 50A is connected to the metal frame 70.
Is not opposed to the portion, and comes into contact with the peripheral edge of the vibration surface of the vibration film 90 (the portion within the metal frame 70). At this time, the spacer 50A also The above-mentioned double-sided tape is used and adhered.

Further, the vibrating body electrode 80 shown in FIG. 12B is placed on the metal frame 70 from above in FIG. The positioning of the metal frame 70 is also controlled by the notch 84 and the notch receiver 29 of the frame 20.
It is done by correspondence. When the vibrating body electrode 80 is provided, the side of the metal frame 70 to which the vibrating membrane 90 is attached is on the upper surface, so that the vibrating body electrode 80 comes into contact with the peripheral edge of the vibrating membrane 90. . At this time, the protruding portion 83 of the vibrating body electrode 80 is led out from the lead-out portion 28 of the frame 20.

Further, from the upper side in the drawing, FIG.
The speaker element 10 as shown in FIG. 1 is configured by covering and fixing the frame 30 of FIG. 2A to which the fixed electrode 40B and the spacer 50B are attached. The attachment of the fixed electrode 40B and the spacer 50B to the frame 30 is substantially the same as the attachment of the fixed electrode 40A and the spacer 50A to the frame 20, and the fixed electrode 40B is
4, the lead wire connecting portion 42 of the fixed electrode 40 </ b> B is fitted in the lead-out portion 37, and the lead wire L _K is led out of the frame 30.

The fixed electrode 40B whose peripheral portion is placed on the fixed electrode disposing portion 34 is exposed from the sound pressure output hole 33 as shown in FIG. Become. The spacer 50B is also adhesively fixed to the upper surface of the fixed electrode 40B (and the upper surface of the wall portion 35) attached to the frame 30 with a double-sided tape.

Further, when the frame 30 to which the fixed electrode 40B and the spacer 50B are attached is brought into contact with the vibrator electrode 80, the spacer 50B does not face the vibrator electrode 80, and 80, and comes into contact with the peripheral edge of the vibration surface of the vibration film 90 (the portion within the metal frame 70). The space between the spacer 50B and the vibration film 90 at this time is also adhered using the above-mentioned double-sided tape.

FIG. 13A is a cross-sectional view of the speaker element 10 assembled as described above.
FIG. 13B is an enlarged view of a portion indicating a holding portion of 0. As can be clearly seen from FIGS. 13A and 13B,
The vibration film 90 is fixed and held in a sandwiched state by the spacers 50A and 50B attached on the fixed electrodes 40A and 40B. Therefore, the vibration film 90 and the fixed electrodes 40A,
The clearance C between the spacer 5B and the spacer 40B is only
0A (including the thickness of the double-sided tape for adhesion), which is determined by the fixed electrodes 40A,
Even if the thickness unevenness of the coating occurs on 40B, the clearance C is not affected. In addition, the fixed electrode 40
A, 40B and the vibrating film 90 are press-contacted only via the spacers to define the position. Therefore, mounting errors of the metal frame 70 and the vibrating body electrode 80 in the frames 20, 30 also affect the clearance C. Absent.

Since the clearance C is naturally set with high precision by the spacers 50A and 50B, there is no problem even if mass production is performed by a so-called line process.

Further, in the configuration of this embodiment, the fixed electrode 4
0A, 40B and the spacers 50A, 50B determine the position of the vibrating film 90 first to maintain the accuracy of the clearance C. With this, the frame of the vibrating film 90 (the metal frame 70, the vibrating body electrode, The position 80) does not need to be fixed with high accuracy. However, conversely, it is conceivable that the metal frame 70 and the vibrating body electrode 80 may rattle only by being appropriately fitted in the groove 26 of the frame 20, but in this embodiment, the elastic body is formed in the groove 26. 60, the metal frame 70 and the vibrating body electrode 80
Rattling is also prevented.

In this embodiment, the spacers 50A, 50A
OB is bonded to the fixed electrodes 40A and 40B with a double-sided tape. By bonding in this manner, the assembling process is facilitated and the device is more suitable for mass production. Further, spacers 50A, 50B
Is bonded to the vibration film 90 with a double-sided tape. However, it is possible to prevent wrinkles from being generated in the vibration film 90 due to thermal expansion, and to achieve high performance as the speaker element 10. it can.

The notches 62, 78 and 84 and the notches 29 correspond to the orientation and positioning of the elastic body 60, the metal frame 70 and the vibrating body electrode 80 in the frames 20 and 30. By doing so, the assembling work and the component direction control in the mass production process become easy.

Next, a second embodiment of the present invention will be described. 14 and 15 are a perspective view and an exploded perspective view of a speaker element of the electrostatic speaker device according to the second embodiment.
This speaker element 10 is substantially the same structure as the first embodiment, the joining means of the frame 20 and 30 only the screw N _1, screws N ₂ (frame outermost peripheral portion of the screw) should be used Accordingly, the screw holes 22 and 32 are not formed in the frames 20 and 30 as in the first embodiment.

Further, in FIG. 15 and FIG. 16 showing the frame 20, two of the surfaces which come into contact with the frame 30 inside the frame 20, as indicated by 20TP, have very slight inclination. Is formed. FIG. 17B shows a tapered surface 20T.
P is shown in an enlarged manner so that the inclination state of P can be understood. The inclination angle θ is set to, for example, about 1 °, and the outer end side is made higher.

The other frame 30 is the same as the frame 30 of the first embodiment except that the tapered surface is not formed and the screw hole 32 is not formed. Further, the other components are the same as those in the first embodiment, and thus description thereof will be omitted.

Also in this embodiment, fixed electrodes 40A, 40B, spacers 50A, 50B,
A metal frame 70 to which an elastic body 60, a vibrating body electrode 80, and a vibrating film 90 are attached is assembled in the same manner as in the first embodiment, and is formed as shown in FIG. 20 and tapered surface 20TP is formed, also the joining position by the screw N ₁ is as indicated by the arrows in FIG. 17, abutting portions of the frame each other taper surface 20TP is formed, among the frames 20, 30 since the substantially intermediate position in the circumferential surface, the frame 20 and the frame 3 by screws N ₁
In joining 0, tapered surface 20TP according gradually screwed screws N ₁ is gradually been gradually brought into contact with the frame 30 toward the inner end from the outer end, the spacer arrangement region (fixed electrode in this case the frame 20 Arrangement part 24 and wall part 25)
Is more strongly pressed in the direction of the spacer arrangement portion (the fixed electrode arrangement portion 34 and the wall portion 35) of the frame 30.

That is, the joining portion by the screw N ₁ is the point of emphasis,
The end of the tapered surface 20TP serves as a fulcrum, and the frame 2
0 and the inner peripheral surface side of the frame 30, ie, the spacers 50A, 50A.
0B and walls 25, 3 in contact with fixed electrodes 40A, 40B
(5) A more reliable sandwiching force can be obtained in the fixed electrode arrangement portions 24 and 34.

As described above, the frames 20 and 30 are structurally formed by the fixed electrodes 40A, 40B and the spacer 50.
A, 50B (and the vibrating membrane 90 sandwiched between the spacers 50A, 50B) is more securely sandwiched, so that the clearance C between the fixed electrodes 40A, 40B and the vibrating membrane 90 is more accurately adjusted. It is set depending on the thickness of 50B. Thereby, for example, maintaining the accuracy of the clearance C in the mass production process becomes easier. In particular, by increasing the pinching force on the inner peripheral side of the frames 30, 40, the fixed electrode 40
Even if the thickness unevenness of A and 40B and the dimensional accuracy of the frames 30 and 40 are somewhat poor, it is possible to cover the unevenness and maintain the clearance accuracy. As a modified example of this embodiment, a structure in which a tapered surface is provided on the frame 30 side,
For example, a structure in which a tapered surface is provided on both of the zeros can be considered.

It is needless to say that the present invention is not limited to the above-described first and second embodiments, and various modifications can be made within the scope of the present invention.

[0053]

As described above, the loudspeaker device of the present invention is configured so that the vibrating body is held in a state of being directly sandwiched by the spacers arranged on the fixed electrode, so that the clearance between the fixed electrode and the vibrating body is maintained. Is determined only by the spacer, and the clearance accuracy control becomes very easy. This has the effect of being suitable for mass production in a line process, and promotes more efficient manufacturing processes and reduced costs.

Further, since the vibrating body is directly pressed by the spacer, the position accuracy of the vibrating body relative to the frame is in a free state. Here, the vibrating body is disposed in the frame via the elastic body. This can prevent rattling of the frame.

Further, by attaching the spacer to the fixed electrode with, for example, an ultra-thin double-sided tape, the workability in the speaker assembly process is improved. Adhesion with a thin double-sided tape or the like has the effect of preventing wrinkles from occurring in the vibrating body due to thermal expansion.

Also, one or both of the frames has a tapered surface in contact with the other frame, and the end of the tapered surface serves as a fulcrum when the pair of frames are joined, so that the fixed electrode and the spacer are structurally sandwiched. The fixed electrode, the spacer, and the vibrating body are more securely pressed and fixed by applying a pinching force to the contact portion, that is, the accuracy of the clearance between the fixed electrode and the vibrating body determined by the spacer is further improved. In particular, there is an effect that the maintenance of the clearance accuracy in the mass production process becomes easier.

[Brief description of the drawings]

FIG. 1 is a perspective view of a speaker element in a first embodiment of a speaker device of the present invention.

FIG. 2 is an exploded perspective view of the speaker element of the first embodiment.

FIG. 3 is a plan view, a right side view, a left side view, a front view, a bottom view, an AA sectional view, and a BB sectional view of one frame of the speaker element of the first embodiment.

FIG. 4 is a plan view, a right side view, a left side view, a front view, a bottom view, a CC sectional view, and a DD sectional view of the other frame of the speaker element of the first embodiment.

FIG. 5 is a plan view, a front view, and an EE cross-sectional view of a metal frame of the speaker element of the embodiment.

FIG. 6 is a plan view and a front view of an elastic body of the speaker element of the embodiment.

7A and 7B are a plan view and a front view of a vibrating body electrode of the speaker element of the embodiment.

FIG. 8 is a plan view and a front view of a spacer of the speaker element of the embodiment.

FIG. 9 is a plan view and a front view of a fixed electrode of the speaker element of the embodiment.

FIG. 10 is an explanatory diagram of a process of assembling the speaker element according to the embodiment.

FIG. 11 is an explanatory diagram of a double-sided tape used in Examples.

FIG. 12 is an explanatory diagram of a process of assembling the speaker element according to the embodiment.

FIG. 13 is a sectional view and a partially enlarged sectional view of the speaker element of the embodiment.

FIG. 14 is a perspective view of a speaker element in a second embodiment of the speaker device of the present invention.

FIG. 15 is an exploded perspective view of the speaker element of the second embodiment.

FIG. 16 is a plan view, a right side view, a left side view, a front view, a bottom view, an AA sectional view, and a BB sectional view of one frame of the speaker element of the second embodiment.

FIG. 17 is a sectional view of a speaker element according to a second embodiment and an explanatory view of a tapered surface of a frame.

FIG. 18 is an explanatory diagram of an electrostatic speaker.

[Explanation of symbols]

Reference Signs List 10 speaker element 20, 30 frame 20TP tapered surface 21, 31, 61, 71, 81, 22, 32 screw hole 23, 33 sound pressure output hole 24, 34 fixed electrode arrangement part 25, 35 wall part 26 groove part 40A, 40B fixed electrode 41 through holes 50A, 50B spacers 60 elastic body 70 the metal frame 80 vibrator electrode 90 vibrating film N _1, N ₂ screws

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Patent Publication No. 41-18646 (JP, B1) Japanese Utility Model Publication No. 51-19858 (JP, Y1) (58) Field surveyed (Int. Cl. ⁷ , DB name) H04R 19/00

Claims (5)

(57) [Claims] 1. A driving signal is applied between a pair of fixed electrodes held so as to face each other, and a polarization voltage is applied between an electrode of a vibrating body held between the fixed electrodes and the fixed electrode. By doing so, in the speaker device that generates sound pressure in accordance with the drive signal, the vibrator is held by a frame, and
A speaker device, wherein the speaker device is disposed between the fixed electrodes while being sandwiched by insulating spacers disposed on the fixed electrodes inside the body . 2. The method according to claim 1, wherein each of the fixed electrodes is attached to a pair of frame bodies, and the frame body of the vibrating body is arranged between the pair of frame bodies via an elastic body. The speaker device according to claim 1, wherein: 3. The speaker device according to claim 1, wherein the spacer is bonded to the fixed electrode. 4. The speaker device according to claim 1, wherein the spacer is adhered to the vibrator. 5. The fixed electrodes are attached to a pair of frame bodies, and one or both of the pair of frames have a tapered surface as a surface that abuts on the other frame. The speaker device according to claim 1, wherein the end portion of the tapered surface serves as a fulcrum to apply a pinching force to a pinching portion between the fixed electrode and the spacer. 4.