H - Electricity
04
R
349/72, 349/80
H04R 1/28 (2006.01) H04R 1/34 (2006.01) H04R 7/04 (2006.01)
Patent
CA 1322042
ABSTRACT OF THE DISCLOSURE A speaker which is thin but which is capable of providing high-fidelity reproduction and ensuring a suitable level of sound pressure even when it is brought close to a wall. A closed chamber is formed in the rear of a part of a diphragm mounted in an enclosure, and an open chamber is formed in the rear of the other part of the diaphragm. The phase difference between sounds radiated from the front and rear surfaces of the diaphragm is increased as large as possible by using an acoustic duct for the sound radiated through the open cavity, thereby minimizing cancellation of sounds and improving the sound pressure level.
547123
Ishikawa Seiichi
Kimura Yoichi
Murata Kousaku
Obata Shuichi
Saiki Shuji
Marks & Clerk
Matsushita Electric Industrial Co. Ltd.
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