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:
Jul. 04, 1989
Filed:
Oct. 18, 1988
Applicant:
Inventors:
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01S / ;
U.S. Cl.
CPC ...
372 31 ; 250205 ; 372 38 ;
Abstract
Herein disclosed is a semiconductor laser control circuit in which: (i) the peak and bottom values of a pulse light can be controlled independently and precisely and set at an optical power value necessary for a high speed; and (ii) the abnormality of the output light of the semiconductor laser can be detected to prevent the stored content of an optical disc, for example, from being broken.