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. 02, 1989
Filed:
Aug. 03, 1988
Applicant:
Inventor:
Yoshikazu Sasaki, Osaka, JP;
Assignee:
Minolta Camera Kabushiki Kaisha, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01S / ;
U.S. Cl.
CPC ...
372 31 ; 372 38 ; 372 26 ; 372 29 ;
Abstract
A laser diode drive system suited to a multitone image forming apparatus. For stopping laser emission from a laser diode the laser diode drive system superimposes a signal having a level corresponding to a maximum level of a video signal applied to the laser diode on a detection signal corresponding to emission intensity of the laser diode. A signal formed by the superimposition is used for negative feedback to a laser diode drive circuit.