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Diaphragm for electro-acoustic transducer

An electro-acoustic transducer and vibrating plate technology, applied in the direction of diaphragm structure, etc., can solve the problems of insufficient durability, poor thin film, and high minimum resonance frequency, and achieve the effect of good durability

Inactive Publication Date: 2009-02-25
MITSUBISHI PLASTICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the vibrating pieces for speakers described in these patent documents have problems in that the durability at high output is insufficient, and the vibrating piece is prone to cracking or breakage.
However, these thin films are crystalline and their rigidity is too strong, and there is a problem that the lowest resonance frequency (f 0 ) is high, and the sound characteristics are poor, such as poor bass reproduction, especially the formability of the vibrating piece (press molding or vacuum forming, etc.), and the non-crystalline resin (polyether) whose molding cycle is higher than the glass transition temperature (Tg). imide, etc.) films made of poor

Method used

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  • Diaphragm for electro-acoustic transducer
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  • Diaphragm for electro-acoustic transducer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] Using 100 parts by mass of polyphenylene sulfone resin (Radel R-5000 manufactured by Solvay Advanced Polymer, Tg: 220°C, non-crystalline resin, hereinafter sometimes referred to as PPSU) as polybiphenyl ether sulfone resin, a diameter of It was melt-kneaded at a set temperature of 370° C. in a 40 mm single-screw extruder, and quenched with a 190° C. calender roll to obtain a film with an average thickness of 35.0 μm. Table 1 shows the evaluation results using the obtained film.

Embodiment 2

[0085] A film with an average thickness of 35.0 μm was obtained in the same manner as in Example 1, except that the resin composition constituting the film was changed from 100 parts by mass PPSU in Example 1 to 50 parts by mass PPSU and 50 parts by mass polyether Mixed resin composition of ether ketone resin (VICTREX company, PEEK450G, Tg: 143°C, Tm: 334°C, sometimes abbreviated as PEEK hereinafter). Table 1 shows the evaluation results using the obtained film.

Embodiment 3

[0092] Using 85 parts by mass of PPSU as the polybiphenyl ether sulfone resin (A) and 15 parts by mass of PEEK as the crystalline resin (B), use a single-screw extruder with a diameter of 40 mm with a T-shaped die, and set These were melt-kneaded at a temperature of 370° C., and quenched with a calender roll of 190° C. to obtain a film with an average thickness of 35.0 μm. Table 2 shows the evaluation results using the obtained film.

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PUM

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Abstract

Disclosed is a diaphragm for electro-acoustic transducers, especially a diaphragm for speakers, which is excellent in moldability and durability during high output operation. Also disclosed is a film for such a diaphragm. Specifically disclosed is a diaphragm for electro-acoustic transducers, which is obtained by molding a film containing a polybiphenyl ether sulfone resin (A) having a specific repeating unit, or alternatively containing the polybiphenyl ether sulfone resin (A) and a crystalline resin (B) such as a polyarylketone resin. Also specifically disclosed is a film used for such a diaphragm.

Description

technical field [0001] The present invention relates to a vibrating piece for an electroacoustic transducer used in various audio equipment, and a thin film used for the vibrating piece for an electroacoustic transducer. Background technique [0002] With the popularity of small electronic devices (such as mobile phones, PDAs, notebook computers, DVDs, LCD TVs, digital cameras, portable music players, etc.), small speakers (usually called micro speakers), small earpieces, etc. for these electronic devices And the demand for small electroacoustic transducers such as microphones and earphones is gradually increasing. Generally speaking, for a vibrating piece for a loudspeaker, it is not only required to have a low density to maintain the sound pressure level of the sound radiation, but also to have a strong rigidity to suppress deformation and maintain a large allowable input, and to have a large relative elastic modulus to expand the reproduction frequency band. , and requir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R7/02
Inventor 谷口浩一郎
Owner MITSUBISHI PLASTICS INC