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:
Mar. 20, 2001
Filed:
Mar. 23, 1998
Kenzo Shodo, Kyoto, JP;
Rohm Co., Ltd., Kyoto, JP;
Abstract
A semiconductor laser device has a package which contains inside a laser diode which outputs light according to an applied voltage and a protective element. The protective element has a control terminal and is connected in parallel with the laser diode, and its impedance is significantly smaller than that of the laser diode when no voltage is applied to the control terminal and is significantly larger when a specified voltage is applied to the control terminal. The protective element may be a depletion mode FET connected in parallel with the laser diode between its drain and source, its gate serving as the control terminal. A photoelectric conversion IC for converting a received light signal into an electrical signal may also be contained inside the package and containing the protective element.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile