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:
Apr. 22, 2003
Filed:
Apr. 18, 2001
Takashi Kobayashi, Yamanashi-ken, JP;
Akira Yoneyama, Yamanashi-ken, JP;
Citizen Electronics Co., Ltd., Fujiyoshida, JP;
Abstract
A vibrating plate is mounted in a case, and a first coil is secured to the vibrating plate. A magnetic circuit composition is mounted in the case. The magnetic circuit composition comprises a yoke having a flange and a core formed on the flange, an annular magnet mounted on the flange of the yoke, and a top plate comprising an annular portion and a cylindrical portion projection from a peripheral portion of the annular portion. The magnetic circuit composition is resiliently supported in the case. A coil holding plate is secured to the case, and a second coil is secured to the coil holding plate. The first coil is inserted in a first magnetic gap formed in the magnetic circuit composition and the second coil is inserted in a second magnetic gap formed in the magnetic circuit composition.