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. 17, 1990
Filed:
Mar. 17, 1989
Applicant:
Inventors:
Shigeki Tsuji, Hiroshima, JP;
Hiroshi Ogata, Hiroshima, JP;
Assignee:
Sharp Kabushiki Kaisha, Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01J / ;
U.S. Cl.
CPC ...
2502011 ; 369 46 ;
Abstract
An optical pickup device for reading signal pits on a disk includes a light source, first and second diffraction devices, a first holding member for holding a photosensor and a hollow second holding member for holding an object lens, wherein the first holding member may be rotated inside the second holding member. It is therefore possible to adjust the alignment direction of three light spots projected on an optical disk.