KR20130004464A - High power acoustic transducer - Google Patents

Abstract

PURPOSE: A high power sound transducer is provided to reduce vibration deviation by locating a connection unit of a damper to a frame. CONSTITUTION: A sound transducer includes a frame(100), a yoke(210) combined to the frame, and an internal magnet(220). ThE sound transducer includes an internal top plate(230), an external magnet(240), and an external plate. The sound transducer includes a voice coil(300) and a damper. The sound transducer includes a vibration plate(500), a protector, and a pin terminal.

Description

High Power Acoustic Transducer {HIGH POWER ACOUSTIC TRANSDUCER}

The present invention relates to a high power acoustic transducer.

1 is a cross-sectional view of an acoustic transducer according to the prior art.

As shown in this figure, a typical sound conversion apparatus (speaker) includes a frame 1, a yoke 2 inserted and mounted inside the frame 1, a yoke 2 for transmitting a magnetic flux to the yoke 2, An inner ring magnet 3 and an outer ring magnet 4 receiving the magnetic flux from the inner ring magnet 3 or the outer ring magnet 4 and receiving the magnetic flux from the inner ring magnet 3 or the outer ring magnet 4 to transmit magnetic flux perpendicularly to the voice coil 7, A voice coil 7 in which a part is inserted into the gap between the inner ring magnet 3 and the inner ring top plate 5 and the outer ring magnet 4 and the outer ring top plate 6, A diaphragm 8 for attaching the voice coil 7 to the inside to generate vibration due to the vertical movement of the voice coil 7 and a protector 10 for protecting the diaphragm 8, ).

The lead wire of the voice coil 7 is fixed to the bottom of the diaphragm 8 using a wire bond, and penetrates the side surface of the frame 1 or forms a groove (not shown) formed in the frame 1. It is drawn out through and soldered to the terminals 14 along the outer side of the frame 1, respectively.

In addition, a damper (not shown) may be installed below the diaphragm in order to structurally hold the unidirectional vibration and prevent breakage of the lead wire of the voice coil 7 to increase the reliability of the acoustic transducer. In the application of the conventional microspeakers, the vibration of the sound source is relatively stable due to the high and mid-range, and the damper is not applied in consideration of the number of parts and the working process, but the communication technology is developed and the use of the low-frequency sound source is Increasingly, dampers are often used. At this time, a lead wire for transmitting an electrical signal to the voice coil 7 is attached to the damper, or a damper using an FPCB is used. Conventionally, in order to connect the damper with an external terminal, one end of the damper is bent and bonded with a member such as a pin terminal, or the damper is flat without the end of the damper being flat, but a bonding part is provided inside the damper. . However, in the case of the product that is bonded at one end of the damper, the manufacturing process is not only complicated, but also the extension of the damper is spread out during the manufacturing process, which is easy to be damaged during transportation in the assembly line. In many cases it affected. In addition, when a welding part is provided inside the damper, the damper is first attached to the frame without a diaphragm attached to the damper and the external electrical connection part, and the electrical connection part located on the frame is connected by soldering or welding, and the side diaphragm or Attach the center diaphragm. At this time, since the damper and voice coil assembly are supported only outside of the frame, the damper contact surface cannot be assembled by sufficiently pressing the diaphragm contact surface. This can cause problems with reliability when fixed. In the case where the welding part exists inside the diaphragm, the damper must be attached to the frame, and then the diaphragm must be attached to the damper. Attached in a state that can not be supported by. Therefore, the adhesion between the damper and the diaphragm is not sufficiently secure, which may cause a problem in reliability.

According to the present invention, a damper for guiding vibration of a diaphragm serves as a voice coil to transmit an external electrical signal, and a high-powered sound converting device is easily connected because the connection portion to which an external terminal is connected is exposed to the outside of the diaphragm. The purpose is to provide.

In addition, the present invention, the connection portion of the damper is located in the portion supported by the frame, the bonding is made with the external terminal in the state supported by the frame, the damper is implemented in a plane to reduce the vibration deviation, the solder connection point outside the diaphragm In the jig to have a structure to be assembled to the frame after assembling the diaphragm and the damper, it is an object of the present invention to provide a high output sound conversion device that can improve the reliability of the product by improving the attachment strength of the diaphragm and damper.

The present invention is coupled to the frame, protector, frame, yoke assembly having a magnet, a vibration plate provided in the frame to generate vibration, a voice coil coupled to the vibration plate to vibrate the vibration plate, provided on one side of the frame of the voice coil Contact terminal and voice coil and diaphragm attached to provide electrical connection between the lead wire and external terminal, voice coil and diaphragm attached, formed by FPCB connecting voice coil and contact terminal, connecting part connected to contact terminal It provides a high power acoustic conversion device comprising a damper located outside the diaphragm.

In another embodiment of the present invention, the connection portion of the damper provides a high power acoustic conversion device, characterized in that exposed to the outside of the protector.

In another embodiment of the present invention, the connection portion of the damper provides a high power acoustic conversion device, characterized in that located in the corner of the frame.

In another embodiment of the present invention, the frame provides a high-power sound conversion device characterized in that it comprises two or more projections for fixing the connection portion of the damper.

In another embodiment of the present invention, the frame has a projection for limiting the relative movement of the diaphragm, frame, damper at at least one corner, the frame is a projection for limiting the relative movement of the diaphragm, frame, damper at at least one corner It is provided, the contact terminal provides a high-power sound conversion device, characterized in that the insert is injected into the corner of the frame is formed projection.

In another embodiment of the present invention, the diaphragm includes a center diaphragm positioned at the center portion and a side diaphragm positioned at the edge, and the side diaphragm and the voice coil are attached to the lower side of the damper, and the attachment position of the voice coil and the attachment of the side diaphragm are provided. The positions provide a high power acoustic transducer, characterized in that they are spaced from each other.

In another embodiment of the present invention, the contact terminal provides a high power acoustic conversion device, characterized in that the portion connected to the external connection contact terminal is a flat pad type.

In another embodiment of the present invention, the high power acoustic conversion device is formed in a rectangular shape having a long axis and a short axis, and the pad type contact terminal provides a high power sound conversion device, characterized in that disposed at both ends of the same corner.

In another embodiment of the present invention, the pad type contact terminal is a high power acoustic conversion device, characterized in that the bonding portion connected to the connection portion of the FPCB is located on the upper surface of the frame, the pad portion connected to the external terminal is located on the lower surface of the frame To provide.

In another embodiment of the present invention, the bonding portion and the pad portion are connected by the bent portion, and the end portion of the bonding portion has a portion which does not overlap with the pad portion when viewed in the height direction of the high-power acoustic transducer. Provided is an acoustic transducer.

In addition, as another example of the present invention, the pad portion provides a sound conversion device, characterized in that part is deleted so as not to overlap the end of the bonding portion when viewed in the height direction of the high-power sound conversion device.

In another aspect, the present invention is coupled to the frame, the frame, the yoke assembly is provided with a magnet, is provided in the frame, the vibration plate for generating vibration, the voice coil to vibrate the vibration plate in combination with the vibration plate, the outer ring is supported by the frame, voice coil And a diaphragm is attached, one end of which is connected to the voice coil, and the other end of which is located on the outside of the diaphragm, and a damper formed of an FPCB connected to an external terminal, and a protector covering the diaphragm and the damper. Provide the device.

In another embodiment of the present invention, there is provided a sound conversion device further comprises a short prevention member interposed between the protector and the damper.

In another embodiment of the present invention, the short prevention member provides an acoustic transducer, characterized in that the protector is insert injection.

In another embodiment of the present invention, the protector provides an acoustic conversion device, characterized in that the injection molded from a non-conductive material.

The high power acoustic conversion device provided by the present invention serves as a damper for guiding the vibration of the diaphragm to transmit an external electrical signal to the voice coil, and a connection part to which an external terminal is connected is exposed to the outside of the diaphragm so as to connect the work. This has the advantage of being easy.

In addition, the high-power acoustic conversion device provided by the present invention is located at a portion where the connection portion of the damper is supported by the frame, and the external terminal is bonded in a state supported by the frame, the damper is implemented in a plane to reduce the vibration deviation In addition, since the solder connection point is outside the diaphragm, it may have a structure of assembling the diaphragm and the damper through a jig, and thus, the strength of the diaphragm and the damper may be improved to increase the reliability of the product.

1 is a cross-sectional view of an acoustic transducer according to the prior art,
2 is an exploded perspective view showing an exploded sound conversion device according to a first embodiment of the present invention;
3 is a perspective view from above of an acoustic transducer according to a first embodiment of the present invention;
4 is a perspective view from below of an acoustic transducer according to a first embodiment of the present invention;
Fig. 5 is a sectional perspective view showing a cross section of the acoustic transducer according to the first embodiment of the present invention.
6 is an exploded perspective view showing an exploded sound conversion device according to a second embodiment of the present invention;
7 is an exploded perspective view showing an exploded sound conversion device according to a third embodiment of the present invention.

2 is an exploded perspective view showing an exploded sound conversion device according to a first embodiment of the present invention, Figure 3 is a perspective view from above of the sound conversion device according to a first embodiment of the present invention, Figure 4 is a view of the present invention A perspective view of the acoustic transducer according to the first embodiment as seen from below. The acoustic conversion device according to the first embodiment of the present invention includes a frame 100, a yoke 210 coupled to a lower surface of the frame 100, an inner ring magnet 220 attached to the yoke 210, and an inner ring magnet. Outer ring top plate 230, outer ring magnet 240 fixed to frame 100 and yoke 210, outer ring top plate 250 covering outer ring magnet 240, inner ring magnet 230 and outer ring magnet 240 The upper part of the damper 400 and the damper 400 are vibrated together with the voice coil 300 to which the voice coil 300 and the voice coil 300 which are vibrated up and down according to an electrical signal are inserted. , Or attached to the lower part, the diaphragm 500 which vibrates with the damper 400, protects the internal parts, and combines with the frame 100 to form an exterior and at the same time defines the internal vibration space and contact with the protector 600. As an example of a terminal, it is attached to a lower portion of the frame 100 to provide a connection point with an external terminal. It includes a pin terminal (700). Hereinafter, the external terminal refers to a part or part provided in a machine in which the high output acoustic conversion device is installed and transmitting an electrical signal to the high output acoustic device, and the contact terminal is electrically connected to the external terminal to the FPCB, which is a damper 400. It refers to a part or part that carries a signal. In the first embodiment of the present invention, as an example of the contact terminal, a pin terminal 700 is employed.

The damper 400 is formed of an FPCB capable of transmitting an external electrical signal to the voice coil 300. The damper 400 formed of FPCB is formed in a pattern so as to transmit positive and negative currents, respectively, and a voice coil 300 is connected to one end of each pattern, and an external terminal is connected to the other end. Hereinafter, a portion where the damper 400 and the contact terminal are connected is referred to as a connection portion 410.

The voice coil 300 is attached to the damper 400 by soldering or the like, and then the diaphragm 500 is attached by a tape or other adhesive. The damper 400 allows the vibration of the diaphragm 500 to be made only in the up and down directions, thereby preventing abnormal vibrations such as divided vibration and single vibration, thereby improving sound quality. The diaphragm 500 includes a center diaphragm 510 positioned in the center portion and a side diaphragm 520 positioned outside the center diaphragm 510 and formed in a ring shape. The center diaphragm 510 and the side diaphragm 520 have a dome shape, and each of the center diaphragm 510 protrudes upward or downward. The center diaphragm 510 and the side diaphragm 520 generally protrude upwards, but when the height of the voice coil 300 increases, the lower space of the damper 400 may be used as the vibration space. Therefore, the center diaphragm 510 and the side diaphragm 520 may protrude downward, thereby reducing the height (size) of the high power acoustic transducer. The center diaphragm 510 and the side diaphragm 520 may be attached to the upper portion of the damper 400 or may be attached to the lower portion. In the drawing, the center diaphragm 510 is attached to the upper portion of the damper, and the side diaphragm 520 is attached to the lower portion of the damper. At this time, the connection portion 410 of the damper 400 is located where it does not overlap with the diaphragm 500, and is located at the edge of the damper 400 for the convenience of connection with the pin terminal 700. That is, the connection part 410 is formed on the outside of the part where the side diaphragm 520 is attached to the damper 400 so that the side diaphragm 520 and the connection part 410 do not overlap each other. Located. Therefore, the outer circumference of the damper 400 is longer than the outer circumference of the side diaphragm 520. Through this configuration, the coupling of the damper 400, the diaphragm 500 and the voice coil 300 is made through a jig, which can be fixed while pressing at a constant pressure during bonding, thereby enabling a firm coupling.

Next, the voice coil 300, the side diaphragm 520, and the center diaphragm 510 are attached to the damper 400, and then the damper 400 includes the yoke 210, the inner ring magnet 220, and the inner ring top plate 230. The damper 400 is seated on the frame 100 on which the outer ring magnet 240, the outer ring top plate 250, and the pin terminal 700 are installed. The frame 100 includes a protrusion 110 to help seat the damper 400 and the diaphragm 500, and one end of the pin terminal 700 is positioned at a portion where the connection portion 410 is seated. Protrusion 110 is located at the corner of the frame 100, the damper 400, the diaphragm 500, the protector 600 at least one corner at least one corner so as to prevent the departure from up, down, left, right 110 is formed. Preferably, the protrusion 110 is formed at an edge at which the connection portion 410 of the damper 400 is located, and the protector 600 may be fixed to the protrusion 110 by the protrusion 110. It has a portion formed to engage with. The damper 400 may be seated on the frame 100 and then easily connected to the pin terminal 700 through soldering or the like, and the connection work is performed in a state of being seated on the frame 100. Can provide work The protector 600 may be made to cover up to the connecting portion 410, and the connecting portion 410 may be made to expose. According to an embodiment of the present invention illustrated in the drawing, the protector 600 may include a connecting portion ( 410 is not covered. When the protector 600 does not cover the connection portion 410, the coupling unit 410 is coupled to the frame 100 and then the diaphragm 500 is covered with the protector 600. Since the connection operation of 700 is made, it is possible to prevent damage to the diaphragm 500 that may occur during the connection operation, it is possible to more solid connection operation. On the other hand, when the protector 600 is coupled after the connection operation of the connection portion 410 and the terminal 700, the connection portion 410 and the connection portion of the terminal 700 can be covered with the protector 600, There is an advantage that the damage of the connecting portion 410 can be prevented.

5 is a cross-sectional perspective view showing a cross section of the acoustic transducer according to an embodiment of the present invention.

Referring to FIG. 5, a structure in which the voice coil 300 and the diaphragm 500 are attached to the damper 400 will be described. As described above, the diaphragm 500 includes a center diaphragm 510 and a side diaphragm 520, and the center diaphragm 510 and the side diaphragm 520 have a dome shape protruding upward or downward. In the case of an acoustic converter that requires high power, the number of turns of the voice coil 300 increases, so that the height of the voice coil 300 may increase. In addition, the height of the protruding height of the side diaphragm 520 is increased to reinforce the low range. When the voice coil 300 is attached to the lower part and the side diaphragm 520 protrudes upward, the height of the entire sound conversion device is increased. do. By forming the side diaphragm 520 to protrude downward, the side diaphragm 520 can vibrate in a space secured for attachment and vibration of the voice coil 300, which is advantageous for miniaturization of the entire sound conversion device. In the case of the center diaphragm 510, the space provided by the protector 600 on the upper side is used as the vibration space, or the protector 600 does not cover the diaphragm 500. The space between the cases can be used as a vibration space, so that it may protrude upward or downward.

The voice coil 300 generates heat as current flows during operation of the acoustic transducer. Therefore, it is necessary to protect the side diaphragm 520 provided on the same side as the voice coil 300 from heat generation. This is because the side diaphragm 520 is made of a thin film, which is susceptible to heat and deforms. Therefore, when the voice coil 300 is attached to the damper 400 by soldering or the like, and the side diaphragm 520 is attached by adhesive or adhesive tape, the side is spaced apart from the attachment position of the voice coil 300 by a predetermined distance. The diaphragm 520 is attached. Therefore, the side diaphragm 520 may be protected from the heat generated by the voice coil 300 when the acoustic transducer is operated.

Meanwhile, the center diaphragm 510 and the side diaphragm 520 may be made of a film of the same material as needed, or may be made of a film of a different material. The center diaphragm 510 is made of a thermoplastic film such as PE, PP, PEN, PEI, PEEK, PET, and UV molding may be performed as necessary. In addition, the side diaphragm 520 may be manufactured by laminating a thermoplastic film such as PE, PP, PEN, PEEK, PEI, PET, and a thermoplastic urethane film such as TPU. Since the center diaphragm 510 and the side diaphragm 520 are in charge of different sound bands, the side diaphragm 520 increases the ductility and elasticity to improve the acoustic characteristics of the low frequency band, and the center diaphragm 510 is light and rigid. By increasing the sound characteristics of the medium and high frequency band can be improved.

In addition, referring to Figure 5, the outer ring top plate 250 and the frame 100 can be seen that the step is formed to engage with each other. In the case where the outer ring top plate 250 and the frame 100 are formed to engage with the step, respectively, the space required for fixing the outer ring top plate 250 and the frame 100 to each other is reduced as compared with the case where the outer ring top plate 250 and the frame 100 are engaged. More specifically, the upper part of the outer ring top plate 250 should be covered by the frame 100 to fix the outer ring top plate 250 and the outer ring magnet 240, forming a step on the outer ring top plate 250, The height of the frame 100 protruding above the outer ring top plate 250 required to fix the outer ring top plate 250 may be reduced by forming a step that engages with the frame 100. Therefore, since the height (space) required for fixing the outer ring top plate 250 and the frame is reduced, when the sound conversion device is installed in the same size space, the space for vibration of the diaphragm can be further enlarged. It can help to improve the output of the, it is advantageous to the miniaturization of the acoustic transducer. In addition, the leakage magnetic flux flowing from the outer ring magnet 240 to the frame 100 can be reduced, and the amount of magnetic flux flowing between the outer ring magnet 240 and the inner ring magnet 220 can be increased, thereby improving the output of the sound conversion device. You can.

6 is a diagram illustrating a high power acoustic conversion device according to a second embodiment of the present invention. The high power acoustic conversion device according to the second embodiment of the present invention is similar to the sound conversion device according to the first embodiment, to the yoke 210 and the yoke 210 coupled to the frame 100, the lower surface of the frame 100. Attached inner ring magnet 220, inner ring top plate 230 to cover the inner ring magnet 230, outer ring magnet 240 fixed to the frame 100 and yoke 210, outer ring top plate 250 to cover the outer ring magnet 240 A part is inserted between the inner ring magnet 230 and the outer ring magnet 240, and a voice coil 300 and a voice coil 300 vibrating up and down according to an electrical signal are attached to the vibration coil together with the voice coil 300. The damper 400 is attached to the upper or lower portion of the damper 400, the vibration plate 500 vibrating with the damper 400, and protects the internal parts, while combining with the frame 100 to form an appearance It includes a protector 600 defining an internal vibration space.

Unlike the first embodiment, the second embodiment does not include a separate pin terminal, and the connection portion 410 is positioned on the outer circumference of the damper 400 that contacts the frame 100. Instead of having a separate pin terminal, an external terminal is directly bonded to the connecting portion 410. At this time, the connection portion 410 is not overlapped with the diaphragm 500 does not damage the diaphragm 500, and since the connection portion 410 is supported by the frame 100 can be firmly bonded Do.

In the high power acoustic conversion device according to the present invention, the FPCB is used as a damper, and unlike the conventional sound conversion device, the damper, which is an FPCB, is bent and connected to an external terminal at the bottom of the frame, or the damper is supported and fixed by the frame. Contact terminals such as pin terminals are not bonded to the inner portion other than the portion. Instead, the connecting portion bonded to the pin terminal is provided on the edge side of the damper supported by the frame, and the pin terminal and the damper are bonded at the edge. In another embodiment, even when the pin terminal is not provided and the external terminal is directly connected, a connection portion to which the bonding is made is provided at the edge of the damper. In this case, since the connecting portion does not overlap the diaphragm, the damage of the diaphragm may be prevented during bonding or the bonding of the connecting portion due to the vibration may be prevented from weakening when the diaphragm vibrates.

7 is a diagram illustrating a high power acoustic conversion device according to a third embodiment of the present invention.

The high power acoustic conversion apparatus according to the third exemplary embodiment of the present invention also has the yoke 210 and the yoke coupled to the lower surface of the frame 100, the frame 100 like the acoustic conversion apparatus according to the first and second exemplary embodiments. Inner ring magnet 220 attached to 210, inner ring top plate 230 covering the inner ring magnet 230, outer ring magnet 240 fixed to the frame 100 and yoke 210, outer ring top plate covering the outer ring magnet 240 250, a part is inserted between the inner ring magnet 230 and the outer ring magnet 240, and a voice coil 300 and a voice coil 300 vibrating up and down according to an electrical signal are attached to the voice coil 300. Vibration damper 400, and attached to the upper or lower portion of the damper 400, vibrating plate 500 vibrating with the damper 400, to protect the internal parts, combined with the frame 100 to the exterior And a protector 600 defining the internal vibration space at the same time. In addition, unlike the first and second embodiments, as a contact terminal providing a connection point with an external terminal, a pad type contact terminal 900 is provided in the frame 100 and interposed between the damper 400 and the protector 600. It further comprises a short prevention member 800 to be.

The pad type contact terminal 900 is insert injection molded into the frame 100 and bonded to the pad part 910 for contacting the external terminal to receive an electrical signal and to the connection part 410 of the damper 400 formed of FPCB. A bending portion 930 connecting the bonding portion 920 and the pad portion 910 is included. The pad portion 910 is positioned to be exposed to the lower surface of the frame 100 for contact with an external terminal, and the bonding portion 920 is for contact with the connecting portion 410 of the damper 400. Position it so that it is exposed to the top edge of the. In order for the frame 100 and the pad type contact terminal 900 to be integrally formed by insert injection, the pad type contact terminal 900 must be fixed in the mold so that the pad type contact terminal 900 is positioned at the correct position. It can be formed so that a defect does not arise. Since the pad portion 910 of the pad type contact terminal 900 is located on the lower surface of the mold, a separate fixing member is not necessary. However, since the bonding portion 920 is located at a position spaced apart from the lower surface, the pad portion 910 is not located at the correct position. Since the bonding part 920 is buried in the injection molding, the defective part which is impossible to bond because it is not exposed to the outside may be produced and needs to be fixed at the correct position. Injection should be made while the bonding part 920 is pressed from the upper and lower parts and fixed at the correct position. Since the upper part is open, the injection part 920 is easily pressed by a separate member. However, since the pad portion 910 is present on the same axis as the lower portion, the pad portion 910 and the bonding portion 920 may be formed so as not to overlap the pressing portion 920. Therefore, when the pad portion 910 and the bonding portion 920 are viewed in the height direction (the stacking direction of components such as a frame, a magnet, and a damper) of the high power acoustic transducer, the ends of the bonding portion 920 do not overlap the pad portion 910. It should not be formed. A portion of the bonding portion 920 may extend longer than the pad portion 910, or may cause the pad portion 910 to be partially erased.

The short prevention member 800 interposed between the damper 400 and the protector 600 will be further described. The short prevention member 800 may be modified and applied to the structures of the frame and the damper in the first and second embodiments. The protector 600 is for protecting the voice coil 300, the damper 400, and the diaphragm 500, and a sound emission hole for sound emission is generally drilled. Since protection requires sufficient strength, the protector 600 is generally formed of metal. When the protector 600 is formed of a metal, there is a case in which a short occurs due to contact with the contact terminals 700 and 900 or the damper 400 which is an FPCB. In order to prevent this, the short prevention member 800 made of a nonmetal is interposed between the damper 400 and the protector 600. The short prevention member 800 is formed in a rectangular ring shape to contact the circumference of the protector 600, and prevents the protector 600 from contacting the damper 400 or the contact terminals 700 and 900. In the short prevention member 800, the metal protector 600 is insert injection molded so that the short prevention member 800 and the protector 600 are integrally formed. Of course, the protector 600 may be formed of a non-conductive material instead of the separate short prevention member 800.

Claims (5)

A frame having a rectangular cross section;
Protectors;
A yoke assembly coupled to the frame and having a magnet;
A diaphragm seated on the frame, the diaphragm having a rounded corner shape so as to have an area smaller than the edge of the frame, and generating vibration;
A voice coil coupled to the diaphragm to vibrate the diaphragm;
A contact terminal provided at one side of the frame and providing an electrical connection by contact between a lead wire of the voice coil and an external terminal; And
And a damper to which the voice coil and the diaphragm are attached, and formed of an FPCB connecting the voice coil and the contact terminal, wherein a connection portion electrically connected to the contact terminal is provided at an area between a right angle frame and a rounded diaphragm. High power sound converter characterized in that. The method of claim 1,
The connection portion of the damper is a high output sound transducer, characterized in that exposed to the outside of the protector. The method of claim 1,
The connection part of the damper is located at the corner of the frame,
The frame has two or more projections for fixing the connection portion of the damper high power acoustic conversion device, characterized in that. The method of claim 1,
The frame has projections for limiting relative movement of the diaphragm, frame, and damper at at least one corner, and the contact terminal is insert injection into the corner of the frame is formed projections. The method of claim 1,
And a short prevention member interposed between the protector and the damper.

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