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:
Jun. 17, 2008
Filed:
Mar. 19, 2003
Applicant:
Naotaro Nakata, Kyoto, JP;
Inventor:
Naotaro Nakata, Kyoto, JP;
Assignee:
RHOM Co., Ltd, Kyoto-Shi, JP;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G11B 7/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
An optical pickup for reading information written on an optical disk is equipped with a vertical multi-mode converted laser diode which emits light, means for focusing the emitted light from the laser diode onto the optical disk, and means for receiving reflected light from the optical disk in order to read the information written on the optical disk, wherein the coherent distance of the emitted light from the laser diode is made shorter than the optical path length of the optical pickup.