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:
Dec. 28, 2004
Filed:
Jul. 03, 2001
Takehiro Matsuda, Saitama, JP;
Pioneer Corporation, Tokyo, JP;
Abstract
There is an optical pickup apparatus using a semiconductor laser element having a first light emission part and a second light emission part wherein it is constructed so that in case that the first light emission part is placed in a position in which an image height does not occur and the second light emission part is placed in a position in which an image height occurs, when the first light emission part is driven, the same focus driving currents are supplied from a focus driving part and when the second light emission part is driven, an objective lens is driven in a focus direction with the objective lens inclined by generating an offset value having a predetermined value from an offset generation part and varying one of the focus driving currents of the focus driving part