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:
Aug. 08, 1989
Filed:
Dec. 27, 1988
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A semiconductor laser control apparatus for controlling an intensity of light emitted from a semiconductor laser by controlling a drive current to by supplied to the semiconductor laser, includes a first circuit which roughly determines a first value of the drive current so as to obtain a intensity of light near a desired intensity of light emitted from the laser diode, a second circuit which precisely determines a second value of the drive current so as to obtain the desired intensity of light, after determining the first value of the drive current by the first circuit, and an adder which adds the first value of the drive current determined by the first circuit and the second value of the drive current determined by the second circuit. The drive current having an added value is supplied to the semiconductor laser.