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:
Apr. 07, 1998
Filed:
May. 02, 1995
Hiroyuki Kashima, Nagoya, JP;
Tsuyoshi Ohashi, Hashima, JP;
Brother Kogyo Kabushiki Kaisha, Nagoya, JP;
Abstract
In a laser scanner device in which a laser beam emitted from a laser diode is reflected in a main scan direction over a predetermined angle by a polygon mirror which rotates at a high speed, the laser beam is reflected from a flat mirror and received by a horizontal synchronizing detection sensor before the laser beam enters a scanning region in which a main scanning operation of the laser beam is performed to form an electrostatic image on a photosensitive drum. In response to the detection of the laser beam, the detection sensor produces a horizontal synchronizing signal which is used as a reference phase to determine a start phase of the main scanning operation. The laser diode and the horizontal synchronizing detection sensor are disposed proximate to each other so that the first optical axis of the laser beam emitted from the laser diode is located at an angle-retarded side in the rotational direction of the polygon mirror with respect to the second optical axis of the laser beam which is reflected from the polygon mirror and then enters the horizontal synchronizing detection sensor. In addition, the laser diode and the horizontal synchronizing detection sensor are mounted on the same board.