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:
Oct. 23, 2007
Filed:
Jan. 12, 2004
Applicant:
Koji Miyake, Higashihiroshima, JP;
Inventor:
Koji Miyake, Higashihiroshima, JP;
Assignee:
Sharp Kabushiki Kaisha, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 7/095 (2006.01);
U.S. Cl.
CPC ...
Abstract
A light pickup device includes a light projection optical system comprising a light source which emits light, and an objective lens which condenses the light on an optical disk, a light detection optical system comprising a light detector, and a condenser lens which condenses light reflected from the optical disk on the light detector, and an adjustment optical element for coinciding a center axis of an intensity distribution of the light condensed on the optical disk by the light projection optical system with an optical axis of the objective lens.