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:
May. 22, 2001
Filed:
May. 20, 1999
Shinichi Osada, Shiga, JP;
Tomozo Yamanouchi, Shiga, JP;
Murata Manufacturing Co., Ltd., Kyoto, JP;
Abstract
A pumping circuit for a semiconductor laser is formed by connecting a semiconductor laser in series with a positive temperature coefficient (PTC) thermistor element which has a temperature coefficient in the range between −1.5%/° C. and −0.5%/° C. within the temperature range between −20° C. and +70° C. and of which the temperature coefficient becomes positive at a temperature over +70° C. A resistor insensitive to temperature changes may be further connected to the PTC thermistor element either in series or in parallel. The semiconductor laser and the PTC thermistor element are disposed sufficiently close to each other so as to be thermally coupled inside a container such as a can to form a semiconductor apparatus.