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:
May. 11, 2010
Filed:
Mar. 11, 2005
Yuka Nagata, Osaka, JP;
Masahide Suzuki, Osaka, JP;
Yuka Nagata, Osaka, JP;
Masahide Suzuki, Osaka, JP;
Hosiden Corporation, Yao-shi, Osaka, JP;
Abstract
In the speaker of the invention, a circular outer magnet type magnetic circuit, and a diaphragmto which a circular voice coildriven by the circuit is fixed are held on a rectangular frame. The circular outer magnet type magnetic circuitis configured by: a yokein which a rectangular flangeis disposed in one end of a circular center pole; a plate-like magnetwhich has a circular center hole, which is placed with forming a circular annular gap around the yoke center pole, and which has a rectangular outer shape that is substantially identical with the outer shape of the yoke flange; and a circular annular pole piecewhich is substantially equal in inner diameter to the magnet center hole, in which the outer diameter is substantially equal to short side dimensions of the yoke flangeand the magnet, and which cooperates with the yoke flangeto clampingly hold the magnet. A circular magnetic gapis formed between the yoke center poleand the pole piece. The magnetis split into two portions in a center area in the longitudinal direction.