| 摘要 |
PROBLEM TO BE SOLVED: To provide a plane loudspeaker equipped with a yoke flat board 10, permanent magnets 12 fitted to one side of the yoke 10 where the magnets adjacent to each other have opposite polarities, a vibrating membrane 14 where spiral coils are formed on both sides of a base film 16 in a way that adjacent sides of the adjacent spiral coils receive currents in the same direction and a speaker 20 that holds the vibrating membrane 14 by a prescribed distance from the magnetic pole face of the permanent magnets 12 that prevents the vibrating membrane 14 from being slacked so as to reduce deterioration in the sound quality. SOLUTION: A liquid crystal polymer film is used for a base film 16 of a vibrating membrane 14. Since the liquid crystal polymer film has an excellent size stability against a temperature rise and has a considerably lower hygroscopicity that that of a conventional resin film, a slack hardly takes place in the vibrating membrane using the liquid crystal polymer for its base film even for use for a long time and the deterioration in the sound quality can be reduced.
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