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:
Jan. 06, 1981
Filed:
Oct. 30, 1978
Applicant:
Inventor:
David R Patterson, Trenton, NJ (US);
Assignee:
RCA Corporation, New York, NY (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01S / ;
U.S. Cl.
CPC ...
331 / ;
Abstract
Within a power supply circuit for a semiconductor laser, output current is maintained constant at each temperature level over an operating range and the magnitude of that constant current is varied directly with temperature to maintain the light output of the laser substantially constant over the operating temperature range. In the preferred embodiment, the negative temperature coefficient characteristic of the base-emitter junction voltage for bipolar transistors is utilized to compensate for the negative temperature coefficient characteristic of the light output from the semiconductor laser.