Vibrating plate for electricity-sound transformer and method for producing the same, and electricity-sound transformer and equipment using the same
A technology of electro-acoustic transducers and thin films, which is applied in the field of advanced devices, can solve the problems of electro-acoustic transducers, such as the decline in acoustic characteristics, poor drawing formability, and high price, and achieve the effects of good acoustic characteristics, maintaining strength and toughness, and large internal losses
Inactive Publication Date: 2007-03-07
PANASONIC CORP
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Problems solved by technology
However, the internal loss of such an aromatic polyimide film is small, and if it is used as a diaphragm of an electroacoustic transducer, the acoustic characteristics of the electroacoustic transducer will be degraded.
Furthermore, the deep drawing formability during production is poor, and the metal temperature during forming must be above 300°C. The forming machine suitable for such heat resistance is expensive, and at the same time, the forming interval time is also longer.
Method used
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[0011] FIG. 1 is a cross-sectional view of a speaker that is an electroacoustic transducer using a diaphragm according to an embodiment of the present invention. The loudspeaker 30 has a magnet 21 , an upper splint 22 , a magnetically conductive plate 23 , a frame 26 , a diaphragm 27 and a voice coil 28 . The magnet 21 is sandwiched between the upper clamping plate 22 and the magnetically conductive plate 23 . That is, an internal magnetic type magnetic circuit 24 is formed. The frame 26 is connected to the magnetically conductive plate 23 which is part of the magnetic circuit 24 . The outer periphery of the diaphragm 27 is connected (adhesively bonded) to the peripheral edge portion of the frame 26 . The voice coil 28 is connected with the vibrating membrane 27 , and the voice coil 28 is arranged within the action range of the magnetic force lines generated by the magnetic gap 25 of the magnetic circuit 24 .
[0012] Next, the material of the diaphragm 27 will be described...
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Abstract
A vibrating plate for an electricity-sound transformer which comprises a film of an aromatic polyimide having a second order transition temperature of 230 to 300 1 / 2 C, wherein the aromatic polyimide film is prepared from a carboxylic acid component comprising a di-carboxylic acid having a structure obtained by binding two or more of benzene rings through an ether bond as a main component and a diamine component comprising a diaminophenyl ether as a main component.
Description
technical field [0001] The present invention relates to a diaphragm used in an electroacoustic transducer, an electroacoustic transducer using the diaphragm, and various audio equipment such as stereo equipment and television equipment using the electroacoustic transducer, electronic equipment such as movie equipment, Devices such as automobiles. Background technique [0002] Conventionally, when durability and heat resistance are required, metal foils are often used as diaphragm materials for electroacoustic transducers. Recently, however, the use of plastic films for diaphragms has increased, especially when cost or yield is considered. [0003] Conventional diaphragms for electro-acoustic transducers with high input power resistance are made of plastic materials such as wholly aromatic polyimide. The resulting diaphragm can withstand the deformation caused by large input power, and can withstand the heat generated by the rise of the voice ...
Claims
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IPC IPC(8): H04R7/02H04R1/30H04R3/00H04R7/12H04R9/02C08G73/10C08L79/08
CPCH04R2307/029H04R7/02C08L79/08C08G73/1071
Inventor 三村和义沟根信也隅山昌英
Owner PANASONIC CORP