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:
Jan. 10, 2006
Filed:
Aug. 04, 1999
Shigeru Nakamura, Tachikawa, JP;
Kazuo Shigematsu, Yoshikawa, JP;
Toshimasa Kamisada, Hiratsuka, JP;
Shigeru Nakamura, Tachikawa, JP;
Kazuo Shigematsu, Yoshikawa, JP;
Toshimasa Kamisada, Hiratsuka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An optical head in which a plurality of semiconductor laser chips are adhered on a mount surface perpendicular to the tracking servo direction of a focusing lens. Fluctuation of an optical spot power is reduced even if the tracking servo is performed by the optical head having dispersion of an inner surface direction when a plurality of the semiconductor laser chips are mounted. In FIG., a plurality of the semiconductor laser chipsandare arranged so as to have a mounting direction which is substantially perpendicular to the tracking servo direction of the focusing lens.