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. 23, 1993
Filed:
Aug. 02, 1991
Akira Minami, Inagi, JP;
Masateru Sasaki, Yokohama, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
In an apparatus for supplying a current for driving a laser diode, an amount of current is supplied to the laser diode. During a read mode, a read peak current modified by a high frequency signal in addition to the amount of current is supplied to the laser diode, and during a write mode, a base read current in addition to the amount of current is supplied to the laser diode so that a light output of the laser diode is equal to a base read output. The read peak current is adjusted so that a mean value of the light output of the laser diode is equal to the base read output. An automatic control is performed upon the amount of current so that the light output of the laser diode is close to or approaches the base read output.