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. 06, 1989
Filed:
May. 26, 1987
Applicant:
Inventors:
Assignee:
Konishiroku Photo Industry Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01S / ;
U.S. Cl.
CPC ...
372 29 ; 372 31 ;
Abstract
A seimconductor laser device wherein the quantity of light emitted from a semiconductor laser is monitored by a light quantity monitor circuit, and the output of the monitor circuit is compared by a comparator circuit with a reference voltage. An emission inhibiting device inhibits the semiconductor laser from emitting light in accordance with the output of the comparator circuit. The emission inhibiting device is arranged to inhibit the supply of an optical modulation signal to the semiconductor laser, or it comprises a current source for driving the semiconductor laser, the output of the current source being reduced when the emission of light from the laser is to be inhibited.