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. 24, 2000
Filed:
Aug. 31, 1998
Applicant:
Inventor:
Yoshihide Kinbara, Tokyo, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01S / ; H01S / ;
U.S. Cl.
CPC ...
372 38 ; 372 35 ;
Abstract
A power source control apparatus has a constant current circuit and plural laser diodes. Switching elements are connected in parallel between anodes and cathodes of the laser diodes. Forward voltage drop of the switching elements is set lower than forward voltage drop of the laser diodes. When constant current output from the constant current circuit flows through the laser diodes, the switching element either short-circuits or opens the anode and cathode of the laser diode. Thus, current path is switched vise versa.