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:
Oct. 21, 1986
Filed:
Feb. 08, 1985
Applicant:
Inventors:
Isamu Shibata, Tokyo, JP;
Yoshiaki Kanmoto, Tokyo, JP;
Assignee:
Ricoh Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01S / ;
U.S. Cl.
CPC ...
372 29 ; 372 38 ;
Abstract
A device detects the radiating output from a semiconductor laser and compares a detected signal with a reference signal in a comparator. An up/down counter is controlled an output signal from the comparator to supply the semiconductor laser with a current proportional to a count output from the up/down counter. The current supplied to the semiconductor laser is controlled and held so as to equalize the input signals to the comparator at all times.