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:
Oct. 27, 1992
Filed:
Dec. 27, 1990
Jiro Egawa, Yokosuka, JP;
Kunihiko Miura, Hiratsuka, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
In an apparatus for adjusting the intensity of a light beam, a first driving current which is stepwisely increased in a first cycle is supplied to a semiconductor laser. The light beam is deflected to scan a photosensitive drum and is detected to generate a positional signal by a photodetector outside of the drum. The intensity of the light beam is also detected by a monitor detector and compared with a predetermined target intensity. The comparison result is latched in a latch circuit to determine a first drive signal. When the intensity of the light beam reaches the target intensity after the generation of the positional signal, a second drive signal is generated in a second cycle longer than the first cycle instead of the first drive signal and is supplied to the semiconductor laser. The second drive signal is determined in accordance with the comparison result latched in the latch circuit.