The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 31, 2001
Filed:
Mar. 19, 1999
Takahisa Tagami, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
A speaker apparatus for reproducing acoustic sounds includes a magnetic circuit unit having a substantially ring-shaped center plate of a magnetic material and a set of substantially annular magnets arranged on both sides of the center plate so that magnetic poles of repulsive polarities face each other with the center plate in-between. The magnetic circuit unit produces a magnetic field on each of an inner rim side and an outer rim side of the center plate. The speaker apparatus also includes a first vibrating system including a first vibrating plate arranged on the inner rim side of the center plate so as to be driven by the magnetic circuit unit, and a second vibrating system including a second vibrating plate arranged on the outer rim side of the center plate so as to be driven by the magnetic circuit unit. The first and second vibrating plates are substantially flat plate shaped and arranged so that their respective major surfaces lie on substantially the same horizontal plane. Since the first and second vibrating plates having respective different reproducing frequency ranges and are positioned on substantially the same horizontal plane, the reproduced acoustic sound may be improved in sound quality.