| 摘要 |
PROBLEM TO BE SOLVED: To provide a flat surface speaker which has a high magnetic flux density, while having a simple structure and in which sound pressure is increased. SOLUTION: In the speaker of a type where magnetized magnets are arranged on the opposite surface side of a vibration plate, a voice coil is printed on a polymer film and the vibration plate is vibrated in a magnetic gap between the magnets. Magnetism-collecting members made of a ferromagnetic metal are respectively fixed to the surfaces of the n-pole and the s-pole facing the gap of the magnets. COPYRIGHT: (C)2005,JPO&NCIPI
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