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. 04, 1992
Filed:
Feb. 22, 1991
Rintaro Nakane, Yokohama, JP;
Jiro Egawa, Yokosuka, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
In an optical unit, a light beam is emitted from a light source toward a given object. Part of the light beam is reflected by a reflecting mirror and is returned to a monitor diode which is incorporated in the light source. The reflecting mirror is arranged in an optical path along which the light beam is directed from the light source to the object, but is located outside of an image region containing an optical axis and expanding in the main scanning direction. By use of the light beam returned to the monitor diode, the deflection start position from which the light beam emitted from the light source is deflected is detected. In other words, the deflection start timing is detected. A variation in the monitor current produced by the monitor diode is utilized for controlling the light source, to thereby match the horizontal synchronization.