KR20110008340A - Electromagnetic converter - Google Patents

Abstract

According to the present invention, the interior of the cavity is formed when the pair of frames 16 and 17 are combined, and the magnetic flux is concentrated on the permanent magnets 32 and 33 disposed inside the pair of frames 16 and 17. The plate 38 is provided, and the diaphragm 21 has the coil pattern 21b which receives the magnetic flux from the plate 38 formed on the diaphragm 21a, and the diaphragm 21a which made the thickness uniform was uneven | corrugated. It is formed in a three-dimensional structure.

Description

Electronic converter {ELECTROMAGNETIC CONVERTER}

The present invention relates to an electromagnetic converter which combines a permanent magnet and a diaphragm to perform voice reproduction from an audio signal.

The conventional electronic transducer which combined a permanent magnet and a diaphragm has arrange | positioned so that a permanent magnet and a diaphragm may oppose, and also arrange | positioned the buffer material between a permanent magnet and a diaphragm. Such permanent magnets, diaphragms, and shock absorbers are covered to fit in members such as frames, and are mounted, for example, on the frames of speakers.

Permanent magnets of this kind of electron transducers have strip-shaped magnet portions (also called multipole magnetization patterns) alternately arranged at different polarities at regular intervals. In addition, the diaphragm arranges a meandering coil pattern at a position opposite to a gap at the boundary of another magnetic pole of the permanent magnet, that is, a portion called a neutral zone of the magnetic field. When a voice signal flows through the meandering coil pattern disposed on the diaphragm, the meandering coil pattern and the multipole magnetization pattern of the permanent magnet act electronically, and the vibrating plate vibrates according to Fleming's law. By this vibration, the surrounding air vibrates and sound waves are generated. The generated sound waves are radiated to the outside of the electronic transducer through the sound emitting holes opened in the permanent magnet and the frame, so that audio reproduction is performed (see Patent Document 1, for example).

Moreover, in order to prevent that a diaphragm receives repeated vibration and a meandering coil pattern disconnects by metal fatigue, the structure by which the diaphragm is reinforced by the rigidity provision member etc. is disclosed (for example, refer patent document 2).

Moreover, conventionally, the thin speaker called "Gamuzon type" which comprised the said permanent magnet and comprised the rod-shaped magnet by changing the said permanent magnet exists in the same structure as the said electron transducer. In this hornless speaker, bar magnets adjacent to each other are alternately arranged at different intervals at predetermined intervals, and magnetic poles of opposite bar magnets are arranged identically (N pole and N pole, or S pole and S pole). And the diaphragm in which the rod magnet was arrange | positioned in the center is inserted from the front and back direction. The other member is comprised with the same member as said electron transducer. Such a thin speaker has a diaphragm in which a coil pattern is disposed by etching on a diaphragm member in which a foil of a metal conductor such as copper or aluminum is deposited or adhered to a substrate made of polyester, polyimide, or the like (for example, a non-patent). See Document 1). This thin speaker also performs audio reproduction by the sound wave generating operation similar to the above-mentioned electronic converter.

In these conventional electronic transducers, a flat diaphragm made of a thin flexible polymer film is used.

Japanese Patent No. 3192372 International Publication No. WO 2003/073787

Speaker system, Takeo Yamamoto edition, radio engineer, July, 1977 issuance

However, the conventional electronic transducer described above uses a flat diaphragm made of a thin flexible polymer film, and when the low frequency range is reproduced, there is a problem that the diaphragm resonates and generates noise when the diaphragm vibrates. there was. Moreover, there existed a subject that a performance was bad by resonating a diaphragm.

This invention is made | formed in order to solve the above-mentioned subject, and an object of this invention is to provide the electronic converter with the favorable performance which suppressed generation | occurrence | production of a noise.

The electromagnetic transducer according to the present invention includes a pair of frames that form a cavity inside when combined, a permanent magnet provided with a plate disposed inside the frame to concentrate the magnetic flux, and a magnetic flux concentrated by the plate. It is provided with a diaphragm in which a coil pattern is formed so that it may receive, and the thickness of a diaphragm is uniform and is formed in the concave-convex three-dimensional structure.

According to the electronic transducer according to the present invention, the diaphragm is formed in a three-dimensional structure of uniform thickness and irregularities, so that the rigidity of the diaphragm itself can be improved, and even when reproducing a low range, the diaphragm vibrates when the diaphragm vibrates. The resonance hardly occurs, and generation of noise can be suppressed. Moreover, since the resonance of a diaphragm is suppressed, performance can be made favorable.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the external appearance of the electronic transducer of Embodiment 1, FIG. 1 (a) is an external appearance front view, FIG. 1 (b) and FIG. 1 (c) is an external appearance side view, FIG. A) appearance back view,
FIG. 2 is a cross-sectional view showing the configuration of the electron converter of Embodiment 1, FIG. 2A is a cross-sectional view along the line AA of FIG. 1A, and FIG. 2B is a FIG. 1A. B-B cross section of,
3 is an external perspective view of the diaphragm of Embodiment 1;
4 is a perspective view showing an appearance of another diaphragm of the electromagnetic transducer of Embodiment 1;
5 is a perspective view showing an appearance of another diaphragm of the electromagnetic transducer of Embodiment 1;
6 is a perspective view showing an appearance of another diaphragm of the electromagnetic transducer of Embodiment 1;
7 is a perspective view showing an appearance of another diaphragm of the electromagnetic transducer of Embodiment 1;
FIG. 8 is a diagram showing an appearance of the electron converter of Embodiment 2, wherein FIG. 8A is an appearance front view, FIGS. 8B and 8C are an appearance side view, and FIG. 8D is A) appearance back view,
FIG. 9 is a cross-sectional view showing the configuration of the electron converter of Embodiment 2, FIG. 9A is a cross-sectional view taken along the line C-C of FIG. 8A, and FIG. 9B is a FIG. 8A. D-D cross section of,
10 is an external perspective view of the diaphragm of the second embodiment;
11 is an external perspective view of another diaphragm of the electromagnetic transducer of Embodiment 2;
12 is an external perspective view of another diaphragm of the electromagnetic transducer of Embodiment 2;
13 is an external perspective view of another diaphragm of the electromagnetic transducer of Embodiment 2;

EMBODIMENT OF THE INVENTION Hereinafter, in order to demonstrate this invention in detail, the form for implementing this invention is demonstrated according to attached drawing.

Embodiment 1

FIG. 1 shows the external appearance of the electronic transducer 10 of Embodiment 1 of the present invention, and FIG. 1 (a) is a front view showing the external appearance of the electronic transducer 10. FIG. It is a side view which shows the external appearance of the electron transducer 10 seen from the long side surface, FIG. 1 (c) is a side view which shows the external appearance of the electron transducer 10 seen from the short side surface, and FIG. It is a rear view which shows the external appearance of the electronic transducer 10. FIG.

As shown in FIGS. 1A and 1D, the electronic transducer 10 has sound emission holes 15a formed on both sides of the frame 15 at regular intervals, As shown in (b) and FIG. 1C, the frame 15 is configured by combining the upper frame 16 and the lower frame 17. In addition, although the upper and lower sides are distinguished by the upper frame 16 and the lower frame 17 for description, as shown to FIG. 1 (a)-FIG. 1 (d), the upper frame 16 and the lower side are shown. The shape of the frame 17 is substantially the same, and the structure which inverted up and down may be sufficient.

FIG. 2: is sectional drawing which shows the structure of the electronic transducer 10 of Embodiment 1 of this invention, and FIG. 2 (a) is the electron transducer at the time of cutting along the AA line shown to FIG. It is sectional drawing of (10).

As shown in FIG. 2A, the electronic transducer 10 includes a frame 15, a diaphragm 21, a diaphragm support 24, an upper permanent magnet 32, a lower permanent magnet 33, and a plate. It consists of 38. The frame 15 is a housing structure which forms the inside of the cavity when the upper frame 16 and the lower frame 17 are combined, and the diaphragm 21 and the diaphragm support material 24 are formed inside the cavity of the frame 15. And the permanent magnets 32, 33 and the plate 38 are covered.

In addition, as shown in FIG. 2A, the diaphragm 21 is made of a thin polymer film of several tens of microns to several hundred microns, and the three-dimensional structure of the diaphragm having an uneven shape has a vibration membrane 21a of approximately uniform thickness. The coil pattern 21b which consists of an electrical conductor is formed in the surface of the vibrating film 21a. The coil pattern 21b is formed by drilling a foil of copper or aluminum electrical conductor by etching, pressing, or the like, and is bonded to the surface of the vibrating membrane 21a. The diaphragm support member 24 is attached to the short end part of this diaphragm 21, and the inner wall surface of the lower frame 17, and the diaphragm 21 vibrates to the lower frame 17 via the diaphragm support material 24. As shown in FIG. Possibly supported.

As shown in FIG. 2A, permanent magnets 32 and 33 are disposed on the inner wall surfaces of the upper frame 16 and the lower frame 17 that face each other. The permanent magnet 32 is mounted on the inner wall surface of the upper frame 16, the permanent magnet 33 is mounted on the inner wall surface of the lower frame 17, and the lower frame 17 facing the permanent magnet 32. At the position of), the permanent magnet 33 is not disposed. In addition, the permanent magnet 32 was not arrange | positioned at the position of the upper frame 16 which opposes the permanent magnet 33. As shown in FIG. Accordingly, the permanent magnets 32 and 33 are mounted in a zigzag arrangement on the inner wall surfaces of the upper frame 16 and the lower frame 17 which are opposed to each other.

In addition, as shown in Fig. 2A, the magnetic pole of the permanent magnet 32 is a surface that is fixed to the upper frame 16 to the N pole and the surface fixed to the upper frame 16. As shown in FIG. The magnetic pole of the permanent magnet 33 is S pole, and the surface fixed to the lower frame 17 is the S pole, and the surface of the permanent magnet 33 is opposed to the surface fixed to the lower frame 17. Therefore, the permanent magnets 32 and 33 are magnetized in the same magnetic pole direction.

In addition, as shown in FIG. 2A, the surface corresponding to the surface fixed to the upper frame 16 of the permanent magnet 32 and the lower frame 17 of the permanent magnet 33 are fixed. The plate 38 is mounted on the surface facing the surface, and the plates 38 are arranged side by side at regular intervals in the horizontal direction. The plate 38 is made of a magnetic material such as an iron plate, and acts as a yoke for concentrating the magnetic flux of the permanent magnets 32 and 33 to the adjacent plates 38 in the horizontal direction.

As shown in FIG. 2A, the diaphragm 21a of the diaphragm 21 is disposed between the permanent magnet 33 and the frame 15, between the plate 38 and the upper frame 16. It is formed in an uneven | corrugated shape so that it may pass between 38 and the lower frame 17, and between the plate 38, and the part bent upwards and the part bent downwards are formed so that it may become substantially perpendicular. The coil pattern 21b is formed between the frame 15 and the plate 38 and between the plate 38. By this structure, the coil pattern 21b is arrange | positioned in the position which concentrated the magnetic force by the plate 38 as a yoke.

FIG. 2B is a cross-sectional view of the electromagnetic converter 10 when cut along the line BB shown in FIG. 1A. As shown in FIG.2 (b), the diaphragm support material 24 is attached between the long end part of the diaphragm 21 and the lower frame 17. As shown in FIG. As described above, the diaphragm support member 24 is also attached to the short end of the diaphragm 21. Therefore, the diaphragm support member 24 is mounted between the outer peripheral end of the diaphragm 21 and the lower frame 17, and the diaphragm 21 vibrates to the lower frame 17 via the diaphragm support material 24. FIG. Supported.

3 is a perspective view of the diaphragm 21 of Embodiment 1 as seen from the inclination.

As shown in FIG. 3, the diaphragm 21 is formed in the diaphragm 21a in the concave-convex three-dimensional structure. On the surface of the vibrating membrane 21a, the coil pattern 21b which consists of an electric conductor is formed in meandering shape. Both ends of the coil pattern 21b are connected to the outside so that an audio signal from a control unit or the like that is not shown is supplied to the coil pattern 21b.

In addition, as shown in FIG. 3, the outer periphery part of the diaphragm 21 is provided with the corrugated overlap part 21c, and the overlap part 21c forms the vibrating film 21a in the wrinkle shape, and overlaps each other. The intensity | strength of the outer peripheral part of the diaphragm 21 is improved by making the made thickness.

Next, the operation principle of the electronic converter 10 will be described.

In the electromagnetic transducer 10, a magnetic field is generated at a high magnetic flux density between the plates 38 mounted on the permanent magnets 32 and 33. When a current as an audio signal is supplied to the coil pattern 21b on the diaphragm 21 from the outside, the magnetic flux between the plates 38 and the current flowing through the coil pattern 21b act to cause the permanent magnets 32 and 33 to operate. The upper plate 38 and the coil pattern 21b of the diaphragm 21 are electronically coupled, and a driving force is generated in the coil pattern 21b according to Fleming's law. As the coil pattern 21b is driven, the diaphragm 21 vibrates, and the air in the frame 15 vibrates by the vibration of the diaphragm 21. The vibration of the air in the frame 15 is radiated outward from the sound emitting hole 15a as audio vibration.

Next, the structure which raises the rigidity of the diaphragm 21 is demonstrated.

As shown in FIG. 3, the diaphragm 21 is formed in the concave-convex three-dimensional structure by the diaphragm 21a which consists of a thin film of substantially uniform thickness, and is compared with the diaphragm itself of the conventional diaphragm. Rigidity is improved.

In addition, as shown in FIG. 3, the outer periphery of the diaphragm 21 is formed in the outer periphery of the diaphragm 21a, and the overlap part 21c which overlapped each other was formed by forming the diaphragm 21a in pleat shape, and the rigidity of the outer periphery of the diaphragm 21 Is improving.

Moreover, as long as it is a structure which improves the rigidity of the diaphragm 21, another structure may be sufficient.

Here, the example of the other structure which improves the rigidity of the diaphragm 21 is demonstrated.

4 is a perspective view showing the appearance of another diaphragm 21 of the electromagnetic transducer 10 of the first embodiment, and the reinforcing coil pattern 21d is formed by changing the overlapping portions 21c of FIG. The reinforcing coil pattern 21d is formed between the coil patterns 21b of the diaphragm 21, that is, in the lateral direction substantially perpendicular to the longitudinal direction and the longitudinal direction of the convex surface of the diaphragm 21, and the coil pattern 21b. ) Is also electrically isolated.

FIG. 5: is a perspective view which shows the external appearance of the other diaphragm 21 of the electromagnetic transducer 10 of Embodiment 1, and replaces the reinforcement coil pattern 21d of FIG. 4, and forms the reinforcement rib 21e. The reinforcing rib 21e forms a groove shape between the coil patterns 21b on the surface of the diaphragm 21, that is, laterally on the convex upper surface of the diaphragm 21.

FIG. 6: is a perspective view which shows the external appearance of the other diaphragm 21 of the electromagnetic transducer 10 of Embodiment 1, and replaces the overlap part 21c of FIG. 3, and provides the reinforcement board 21f. The reinforcing plate 21f is made of a material that is equal to or less than the material of the diaphragm 21, and the convex shapes of the diaphragm 21 are provided to connect adjacent long ends to each other, so that the convex of the diaphragm 21 is convex. The shape is reinforced.

FIG. 7: is a perspective view which shows the external appearance of the other diaphragm 21 of the electromagnetic transducer 10 of Embodiment 1, and replaces the reinforcement board 21f of FIG. 6, and provides the reinforcement board 21g. The reinforcing plate 21g is made of a material that is equal to or less than the material of the diaphragm 21, and is provided on the convex inner wall surface or the convex outer wall surface of the diaphragm 21 to form a convex shape of the diaphragm 21. Is reinforcing. In addition, although not shown, when providing the reinforcing plate 21g along the inner wall surface of the diaphragm 21, the permanent magnets 32 and 33 and the plate 38 are divided or notched, and the diaphragm 21 21g of the reinforcement board does not contact the plate 38 and the permanent magnets 32 and 33 even if () vibrates.

As described above, according to the electromagnetic transducer 10 of the first embodiment, the diaphragm 21 is formed into a concave-convex three-dimensional structure by the diaphragm 21a made of a thin film having a substantially uniform thickness, and at the same time, the plate 38 By forming the coil pattern 21b on the vibrating membrane which receives the magnetic flux concentrated by the? The resonance of (21) is hard to occur, and the effect that generation | occurrence | production of a noise can be suppressed can be acquired. In addition, since the resonance of the diaphragm 21 is suppressed, the effect that the performance becomes favorable is achieved.

Further, according to the electromagnetic transducer 10 of the first embodiment, the diaphragm 21 is formed in the outer peripheral portion of the diaphragm 21 by forming the diaphragm 21a in a corrugated shape and overlapping each other with the overlapped portion 21c. ) The rigidity of the outer circumferential portion is improved, and the vibration plate 21 is not deformed, so that the generation of the noise can be suppressed more.

Further, according to the electromagnetic transducer 10 of the first embodiment, the diaphragm 21 is formed on the convex surface of the diaphragm 21 by forming the reinforcing coil pattern 21d electrically separated from the coil pattern 21b. Stiffness can be improved, and the diaphragm 21 can be prevented from being deformed, so that the generation of noise can be suppressed.

Further, according to the electromagnetic transducer 10 of the first embodiment, the diaphragm 21 is formed between the coil patterns 21b on the surface of the diaphragm 21, that is, by forming the groove-shaped reinforcement ribs 21e on the convex upper surface. Stiffness can be improved, and the diaphragm 21 can be prevented from being deformed, so that the generation of noise can be suppressed.

In addition, according to the electromagnetic transducer 10 of the first embodiment, the convex shape of the diaphragm 21 is reinforced by reinforcing plates 21f and 21g made of a material equivalent to or less than the material of the diaphragm 21. The rigidity of the diaphragm 21 is improved, and the diaphragm 21 is not deformed, and the effect that a generation of a noise can be suppressed can be acquired.

In addition, by forming the uneven shape of the diaphragm 21 substantially vertically, the magnetic gap between the permanent magnets 32 and 33 can be narrowed, and the magnetic flux density of the magnetic circuit can be increased.

Embodiment 2

Although Embodiment 1 demonstrated the structure provided with two or more permanent magnets 32 and 33, Embodiment 2 demonstrates the structure which miniaturizes the dimension of the electromagnetic transducer 10 using FIGS. 8-13. In addition, in order to avoid duplication of description, the same code | symbol is attached | subjected about the structure similar to Embodiment 1, and the description is abbreviate | omitted.

FIG. 8 shows the external appearance of the electronic transducer 10 of Embodiment 2 of the present invention, and FIG. 8A is a front view showing the external appearance of the electronic transducer 10. FIG. It is a side view which shows the external appearance of the electronic transducer 10 seen from the long side, FIG. 8 (c) is a side view which shows the external appearance of the electron transducer 10 seen from the short side, and FIG. It is a rear view which shows the external appearance of the electronic transducer 10. FIG.

As shown in Fig. 8A, the upper frame 16, together with the sound emitting holes 15a, has a sound emitting hole 15b larger than the sound emitting hole 15a in the center of the upper frame 16. The sound emission hole 15b is formed in substantially the same size as the convex shape of the diaphragm 21.

As shown in FIGS. 8B and 8C, the upper frame 16 has a flat plate shape and is configured to cover one surface of the lower frame 17 to form an interior of the cavity. The diaphragm 21 is exposed to the exterior from the sound emission hole 15b of the 16. As shown in FIG.

As shown in FIG. 8D, the sound emission hole 15a is formed in the lower frame 17, but the sound emission hole 15b is not formed.

FIG. 9 is a cross-sectional view showing the configuration of the electron transducer 10 according to the second embodiment of the present invention, and FIG. 9 (a) is an electron transducer when cut along the line C-C shown in FIG. 8 (a). It is sectional drawing of (10).

As shown in Fig. 9A, the upper frame 16 has a sound emitting hole 15b formed at the center thereof, and the sound emitting hole 15a is spaced apart from the sound emitting hole 15b at a predetermined interval. Formed.

In addition, as shown in FIG. 9A, the permanent magnet 33 is disposed and fixed at the center of the inner wall surface of the lower frame 17 that faces the upper frame 16. The plate 38 as a yoke is mounted on the surface of the lower frame 17 that faces the fixed surface. The plate 38 is arranged in a straight line in the horizontal direction of the upper frame 16 and generates a magnetic field having a high magnetic flux density between the upper frame 16 and the upper frame 16.

In addition, as shown in FIG. 9A, the vibrating membrane 21a is disposed between the permanent magnet 33 and the lower frame 17, between the plate 38 and the upper frame 16, and the plate 38. It is formed in convex shape passing through the opposing position, and the coil pattern 21b is formed between the plate 38 and the upper frame 16. As shown in FIG.

FIG. 9B is a cross-sectional view of the electronic transducer 10 when cut along the line D-D shown in FIG. 8A. As shown in FIG. 9B, the convex upper surface of the diaphragm 21 protrudes from the sound emitting hole 15b of the upper frame 16 and is exposed.

The operating principle of the electronic transducer 10 is the same as that of the first embodiment.

Next, the structure which raises the rigidity of the diaphragm 21 is demonstrated.

10 is a perspective view of the diaphragm 21 according to the second embodiment when viewed from an inclination.

As shown in FIG. 10, the diaphragm 21 is formed in the concave-convex three-dimensional structure by the diaphragm 21a which consists of a thin film of substantially uniform thickness, and receives the magnetic flux concentrated by the plate 38. As shown in FIG. By forming the pattern 21b on the vibrating membrane, the rigidity of the vibrating plate itself is improved as compared with the conventional flat plate diaphragm.

As shown in FIG. 10, the stiffness of the outer circumferential portion of the diaphragm 21 is formed on the outer circumferential portion of the diaphragm 21 by forming the diaphragm 21a into a corrugated shape and overlapping portions 21c that overlap each other. Is improving.

In addition, as in the first embodiment, another configuration may be used as long as the configuration improves the rigidity of the diaphragm 21.

Here, the other structure which improves the rigidity of the diaphragm 21 is shown.

Fig. 11 is a perspective view showing the appearance of another diaphragm 21 of the electromagnetic transducer 10 of the second embodiment, and the reinforcing coil pattern (reinforcement) is formed on the convex surface of the diaphragm 21 by changing the overlapping portions 21c of Fig. 10. 21d).

12 is a perspective view showing the appearance of another diaphragm 21 of the electromagnetic transducer 10 of the second embodiment, and the reinforcing rib pattern 21d of FIG. 11 is replaced to form the reinforcing rib 21e. The reinforcing rib 21e forms the groove shape between the coil patterns 21b on the surface of the diaphragm 21, ie, in the lateral direction of the convex upper surface.

FIG. 13: is a perspective view which shows the external appearance of the other diaphragm 21 of the electromagnetic transducer 10 of Embodiment 2, and replaces the overlap part 21c of FIG. 10, and provides the reinforcement board 21g. 21 g of reinforcement plates are provided in the convex inner wall surface of the diaphragm 21, and the convex shape of the diaphragm 21 is reinforced.

As described above, according to the electron transducer 10 of the second embodiment, the same effect as that of the electron transducer 10 of the first embodiment can be obtained, and the effect that the size of the electron transducer 10 can be reduced can be obtained. Can be.

In addition, although Embodiment 1, 2 describes that the meandering coil pattern 21b is formed in the surface of the diaphragm 11, what constitutes the coil pattern 21b on both surfaces of the diaphragm 21a is mentioned. You can do it. The coil pattern 21b may be embedded in the diaphragm 21.

In addition, although the case where the permanent magnets 12 and 13 were 3 rows and 1 row was shown in Embodiment 1, 2, it is also possible to use other number of columns, and the same effect can be acquired by configuring the diaphragm 21 similarly. have.

In addition, an example in which the reinforcing coil pattern 21d is provided in the vibrating membrane 21a, an example in which a groove-shaped reinforcing rib 21e is formed in the vibrating membrane 21a, and a vibrating plate Although the example which provided the reinforcement boards 21f and 21g which consist of material equivalent to or less than the structural component of 21) was shown, you may use individually, respectively, and may combine and it may comprise and the same effect can be acquired. .

In addition, although the upper and lower sides are distinguished by the upper frame 16 and the lower frame 17 for description, the structure which inverted the upper and lower sides may be sufficient.

In addition, each figure shown in embodiment of this invention is shown to exaggerately and enlargedly for clarity, and the relationship, such as thickness of each structure, differs from an actual thing.

Industrial availability

As described above, the electronic transducer according to the present invention can improve the rigidity of the diaphragm itself, and even when the low frequency range is reproduced, resonance of the diaphragm is unlikely to occur when the diaphragm vibrates, which can suppress the occurrence of noise. At the same time, since the resonance of the diaphragm can be suppressed to improve the performance, it is suitable for use in a speaker of an audio system or the like.

Claims (5)

In the electromagnetic converter,
When paired, a pair of frames forming the inside of the cavity,
A permanent magnet disposed inside the frame and provided with a plate for concentrating magnetic flux;
A vibration pattern having a uniform thickness is formed in a concave-convex three-dimensional structure, and a coil pattern that receives a magnetic flux concentrated by the plate has a vibration plate formed on the vibration membrane.
Electronic converter. The method of claim 1,
On the outer circumference of the diaphragm, overlapping portions formed in a pleated shape and overlapping each other are formed.
Electronic converter. The method of claim 1,
Reinforcing coil pattern electrically formed on the surface of the diaphragm is formed, characterized in that
Electronic converter. The method of claim 1,
A groove-shaped reinforcing rib is formed between the coil patterns on the surface of the diaphragm.
Electronic converter. The method of claim 1,
A reinforcing plate for reinforcing the three-dimensional structure of the diaphragm is provided.
Electronic converter.

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