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Electrostatic loudspeaker and production method thereof and conductive back board of electrostatic loudspeaker

A conductive backplane and loudspeaker technology, which is applied to electret electrostatic transducers, sensors, electrical components, etc., can solve the problems of reduced electret life and no protection for electrodes, and achieve the effect of improving service life

Inactive Publication Date: 2012-03-21
TAIWAN ELECTRETAB ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of Taiwan Patent Announcement No. I294250, a conductive plate with several holes is used as the electrode of the electret electroacoustic actuator. The electrode is not protected, which will easily lead to a reduction in the life of the electret.

Method used

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  • Electrostatic loudspeaker and production method thereof and conductive back board of electrostatic loudspeaker
  • Electrostatic loudspeaker and production method thereof and conductive back board of electrostatic loudspeaker
  • Electrostatic loudspeaker and production method thereof and conductive back board of electrostatic loudspeaker

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] With 50 grams of Taipol TPE SBS-4202 (the copolymer of 60% butadiene or isoprene and 40% styrene, purchased from Taiwan Rubber Company) and 5 grams of fluorine-containing cycloolefin (according to U.S. invention patent application 11 / 776,554 No. or British Invention Patent Application No. 0,721,860) into a 2-liter conical flask, add 1,200ml of toluene, stir with a mechanical stirrer at 70°C until the polymer dissolves, and filter the solution with a 0.5μ filter The solution preparation is then completed. Soak the stainless steel conductive mesh (150 mesh) in the above solution for several minutes at room temperature, take it out and dry it at 70°C to complete the protection of the conductive backplane. There is no difference in the conductivity between the surface-protected conductive backplane and the unprotected conductive backplane measured by a three-purpose electric meter (the resistance between any two points on the same conductive backplane is less than 15Ω).

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Embodiment 2

[0056] Dissolve 50 grams of Taipol TPE SBS-4202 and 5 grams of fluorine-containing cyclic olefin (synthesized according to the method of U.S. Patent Application No. 11 / 776,554 or British Patent Application No. 0,721,860) in 300 ml of toluene, spraying This solution is spray-coated on the plastic film conductive backboard (spray-coated on the aluminum-plated surface) of surface aluminized, after drying, make 10 * 14cm as described in embodiment one 2 thin speaker. After testing, there is no significant difference in the sound pressure performance compared with the sound quality and the speaker composed of the unprotected conductive backplane. This proves that the conductive backplane does not affect its sound pressure value after being protected. After 180 days, the sound pressure of the speaker made of the back plate is still maintained at about 83dB. In the experiment of the control group, the sound pressure has dropped to 72dB after 180 days without the protection of the co...

Embodiment 3

[0058] After mixing Asahi's fluorine-containing coating Lumiflon LF200 (Tg: 35°C; OH value: 52mg KOH / g-polymer; specific gravity: 1.12) with a crosslinking agent containing unsaturated monomers of isocyanate, spray the coating Spray the solution on the stainless steel conductive mesh (60 mesh), take it out and dry it at 80°C for 3 hours to complete the protection of the conductive backplane. Make 10×14cm as described in Example 1 2 The sound pressure performance of the thin speaker has no significant difference from the sound quality and the speaker composed of the unprotected conductive backboard. However, the service life of the speaker made of the polymer-protected conductive backboard is greatly improved.

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PUM

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Abstract

The invention relates to an electrostatic loudspeaker and a production method thereof. The loudspeaker comprises a vibrating diaphragm, an electrode and a conductive back board, wherein the electrode is arranged on the surface of the vibrating diaphragm and is combined with the vibrating diaphragm; and the conductive back board is spaced to the electrode, the conductive back board is provided with a plurality of holes, the vibrating diaphragm is deformed because of the variation of an electric field between the electrode and the conductive back board to produce a voice which is transmitted through the holes, the conductive back board is coated with a polymer layer to form a protective film. The conductive backboard is coated by the polymer layer, so the invariability of the electrostatic loudspeaker can be improved, and the service life of the electrostatic loudspeaker can be prolonged.

Description

technical field [0001] The present invention relates to a sound generating device, in particular to an electrostatic loudspeaker and its manufacturing method. Background technique [0002] The speaker vibrates the diaphragm through the generation of electrical signals to produce sound. It is a transducer (transducer) that converts electrical energy into sound energy output. According to its driving method, it can be roughly divided into dynamic and piezoelectric. (piezoelectric) and electrostatic (electrostatic) speakers. [0003] At present, dynamic speakers are the most widely used, and they have been widely used in products such as TVs, stereos, earphones and mobile phones. However, due to its inherent structure and limited power design, the dynamic speaker cannot meet people's needs for portability and low current of electronic products. The piezoelectric speaker uses the piezoelectric effect of the piezoelectric material to deform the piezoelectric material to push th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R19/01H04R31/00
Inventor 姜达铭陈振銮林宜慧
Owner TAIWAN ELECTRETAB ELECTRONICS
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