JPH0555692U - Planar drive speaker - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a flat panel drive type speaker with excellent reproduction efficiency and improved productivity. A magnetic circuit in which a plurality of magnets 4 are arranged on a flat plate-shaped yoke 3 at a predetermined interval and a top plate 5 is arranged on each magnet to form a magnetic gap between adjacent top plates. A planar drive type loudspeaker comprising a section G, a planar diaphragm 1 stretched above the magnetic circuit section, and a voice coil 2 provided on the planar diaphragm so as to correspond to the magnetic gap. A groove 11 is formed in the flat diaphragm 1 made of, for example, so as to be inserted into the magnetic gap, and the voice coil 2 is fixedly arranged in the groove 11.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a flat panel drive type speaker, and more particularly to a flat panel drive type speaker having a magnetic circuit with high efficiency and excellent productivity.

[0002]

[Prior Art]

 FIG. 5 shows an example of a conventional planar drive type speaker. In the planar drive type speaker S3, a planar yoke 3 is arranged on the bottom side of a speaker frame 6, and a plurality of magnets by bar magnets are provided on the upper surface of the yoke 3. 4 are arranged at a predetermined interval, a top plate 5 is provided on the upper surface of each magnet 4 and a magnetic gap is formed between adjacent top plates 5, and a magnetic circuit section G is provided above the magnetic circuit section. It is composed of a stretched flat diaphragm 1 and a voice coil 2 provided on the flat diaphragm so as to correspond to the magnetic gap. The voice coil 2 is a pattern formed by etching a film diaphragm. It was formed by drawing the coil 13. In the figure, 7 is a lead wire of the pattern coil 13. Further, in the conventional planar drive type speaker S4 in FIG. 6, the voice coil 21 formed in a circular shape, an elliptical shape or a rectangular shape is bonded to the back surface side of the flat diaphragm 1 so that the voice coil 21 is arranged in the magnetic gap G. It was fixed with the agent 91. In the figure, 9 is a coil bobbin.

[0003]

[Problems to be solved by the device]

 The planar drive type speaker S3 shown in FIG. 5 has an advantage that the entire speaker can be made thin, but has a disadvantage of poor conversion efficiency. On the other hand, in the planar drive type speaker S4 shown in FIG. 6, the conversion efficiency is improved, but the productivity is poor because the work of forming the voice coil 21 and the work of bonding are required.

An object of the present invention is to improve the above-mentioned drawbacks of the conventional flat panel drive type speaker and to provide a flat panel drive type speaker which is excellent in productivity as well as having a good conversion efficiency.

[0005]

[Means for Solving the Problems]

 According to the planar drive type speaker of the present invention, a plurality of magnets are arranged at a predetermined interval on a flat plate-shaped yoke, and a top plate is arranged on each magnet, and a magnetic gap is provided between adjacent top plates. In a planar drive type speaker comprising a magnetic circuit part having a magnetic field, a planar diaphragm stretched above the magnetic circuit part, and a voice coil provided on the planar diaphragm so as to correspond to the magnetic gap. A groove portion is formed on the plane diaphragm so as to be inserted into the magnetic gap, and a voice coil is fixedly arranged in the groove portion. The plane diaphragm is made of poly-para-phenylene-terephthal-amide gel film. With the above-described configuration, it is possible to divide and form a plurality of reproducing sections having different reproducing frequency bands on one flat diaphragm.

[0006]

[Action]

 Since the voice coil is fixed in the groove by forming the groove on the flat diaphragm, the productivity is excellent. Since the voice coil is arranged in the magnetic gap, the conversion efficiency is very good. ..

[0007]

【Example】

 An embodiment of the planar drive type speaker of the present invention will be described with reference to FIGS. 1 is a cross-sectional view showing a first embodiment of the present invention, FIG. 2 is a front view showing a second embodiment, FIG. 3 is a cross-sectional view of the planar drive type speaker in FIG. 2, and FIG. 4 is a third embodiment. Although it is a cross-sectional view showing an example, the same parts as those of the conventional one described in FIGS. In FIG. 1, S denotes a speaker unit, a flat plate-shaped yoke 3 is provided on the bottom surface side of the speaker frame 6, and a plurality of magnets 4 are arranged on the upper surface of the yoke 3 at predetermined intervals. A top plate 5 is provided on the upper surface of each magnet 4, a magnetic gap is formed between the top plates 5 facing each other, and a magnetic circuit section G is configured. A plane diaphragm 1 is stretched above the magnetic circuit portion G. The plane diaphragm 1 is formed of a film or the like, and is folded back downward at a position corresponding to the magnetic gap. Thus, the groove portion 11 is formed, and the voice coil 2 is fixedly arranged in the groove portion 11 with an adhesive or the like. In the figure, 7 is a lead wire, 8 is a terminal, 12 is an edge, the yoke 3 is provided with a recess 32 corresponding to the groove 11, and the magnet 4 is provided with an inner circumference and an outer circumference. An elliptical magnet with magnetic poles is used.

The flat diaphragm 1 in the present embodiment uses a film material of poly, para, phenylene, terephthalamide, and a gel film by using pure water as a solvent. Further, when the gel film is molded at a molding temperature of 300 ° C., the elongation rate increases, so that the edge 12 can be formed integrally, and the length and width of the groove 11 can be of course formed. The shape and the like can be arbitrarily set according to various conditions of the voice coil 3 and the like to be arranged in the groove. Further, in the flat diaphragm 1 molded under the above conditions, the crystallinity of the film is increased, so that the elastic modulus is increased and the sound velocity is 3900 m / sec. It turned out to be the material of. The voice coil 2 is made of aluminum edgewise, and the SV varnish is applied to the groove portion 11 as an adhesive and fixed at 180 ° C. for 30 minutes.

Since the groove portion 11 of the flat diaphragm 1 is formed so as to correspond to the magnetic gap, the voice coil 2 arranged in the groove portion 11 can be driven extremely efficiently, and the voice coil 2 can be moved to the concave portion 32. Since it extends close to, it will be located in the magnetic field even at large amplitude. In addition, comparing the efficiency of the voice coil impedance and the drive of the magnetic circuit part as in the conventional case and comparing the efficiencies, it was found that the efficiency was improved by 1 to 2 dB and the reproduction frequency band was widened.

Next, a second embodiment will be described with reference to FIGS. 2 and 3. In the figure, S 1 is the entire flat panel drive type speaker, and is a flat diaphragm 1 A formed in a substantially triangular shape. Are groove portions 11A, 11B and 11C, and edge portions 12A, 12B and 12C are formed around the groove portions, respectively, and are formed so as to divide the planar diaphragm 1A into elliptical shapes with different areas. A reproducing section having a different reproducing frequency band, that is, a tweeter section Y1, a squawker section Y2, and a woofer section Y3 is configured.

The reproduced sound from the tweeter unit Y1, the squawker unit Y2, and the woofer unit Y3 is divided by a network to form a thin speaker system, and its characteristics are measured. The on-axis efficiency is 89 db, and the reproduction band is 35. We were able to obtain a speaker system of ~ 16000Hz. In addition, the tweeter portion Y1, the squawker portion Y2, and the woofer portion Y3 can be configured by dividing one flat diaphragm 1A, so that the frame (not shown) of the speaker unit has a simple configuration, Efficiency is improved.

Next, the planar drive type speaker S2 according to the third embodiment will be described with reference to FIG. 4. In the planar diaphragm 1B, the groove portions 11D, 11E and 11F divide the planar diaphragm 1B. The flat diaphragm 1B, which is formed in a concentric circle shape and is surrounded by the groove portions 11D, 11E, and 11F, constitutes a reproducing portion of a tweeter portion Y4, a squawker portion Y5, and a woofer portion Y6, respectively. ..

In this case, the flat diaphragm 1B is divided into concentric circles to form the reproducing portions having different reproduction frequencies, so that the area of the flat diaphragm 1B can be maximized.

[0014]

[Effect of the device]

 According to the planar drive type loudspeaker of the present invention, since the groove is integrally formed in the planar diaphragm and the voice coil is fixedly arranged in the groove, the productivity may be significantly improved and the planar vibration may be improved. When poly-para-phenylene-terephthalamide is used as the material for the plate as in the example, not only can the shape of the groove be freely set according to the voice coil, but the elastic modulus of the planar diaphragm Since it becomes higher, the reproduction frequency can be expanded. In addition, the voice coil can be reliably positioned in the magnetic field because the groove is formed in the flat diaphragm to correspond to the magnetic gap, and the voice coil is fixedly arranged in this, so that the reproduction efficiency is improved. be able to. Furthermore, by dividing one flat diaphragm by the groove portion, it is possible to configure the reproducing portions having different reproducing frequencies, so that it is possible to provide the planar drive type speaker having excellent productivity.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is a front view showing a second embodiment.

3 is a cross-sectional view of the planar drive type speaker in FIG.

FIG. 4 is a sectional view showing a third embodiment.

FIG. 5 is a cross-sectional perspective view showing an example of a conventional planar drive type speaker.

FIG. 6 is a cross-sectional perspective view showing another conventional example.

[Explanation of symbols]

 S Plane drive type speaker 1 Plane diaphragm 11 Groove 2 Voice coil 3 Yoke 4 Magnet 5 Top plate 6 Speaker frame

Claims (3)

[Scope of utility model registration request] 1. A plurality of magnets (4) are arranged on a flat plate-shaped yoke (3) at a predetermined interval, and a top plate (5) is arranged on each magnet so that adjacent top plates are separated from each other. A magnetic circuit part (G) having a magnetic gap formed therein, a planar diaphragm (1) stretched above the magnetic circuit part, and a voice provided on the planar diaphragm so as to correspond to the magnetic gap. In a planar drive type speaker (S) including a coil (2), a groove (11) is formed in the planar diaphragm (1) so as to be inserted into the magnetic gap, and the groove (1) is formed.
A planar drive type speaker characterized in that a voice coil (2) is fixedly arranged in 1). 2. The planar drive type speaker according to claim 1, wherein the planar diaphragm (1) is formed of a gel film of poly para-phenylene terephthalamide. 3. The plane according to claim 1, wherein a plurality of reproducing sections (Y1, Y2, Y3) having different reproducing frequency bands are formed separately on one flat diaphragm (1). Drive type speaker.