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:
May. 30, 2000
Filed:
Jan. 22, 1999
Applicant:
Inventors:
Assignee:
Rohm Co., Ltd., Kyoto, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369112 ; 369 4414 ; 369 4432 ; 369 4441 ; 369103 ;
Abstract
An optical pickup includes a diffraction element for causing diffraction in a reflection beam from a disc. This diffraction element is divided into two of first and second regions. On four light receiving elements are converged respectively a first reflection beam from a first region and a second reflection light from a second region. A switch performs switching-over between four output signals individually taken from four light receiving elements and three output signals in total taken out by adding together two output signals of four output signals.
Shimizu, Manabu. (2000). Focusing adjustment of an optical pickup (U.S. Patent No. 6069863). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/6069863
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile