Title: Light-beam scanner and image forming device
Application Number: 98120504 Application Date: 1998.09.10
Publication Number: 1212385 Publication Date: 1999.03.31
Approval Pub. Date: 2003.10.01 Granted Pub. Date: 2003.10.01
International Classifi-cation: G03G15/00
Applicant(s) Name: K. K. Toshiba Address:
Inventor(s) Name: Koji Tanimoto;Kenichi Komiya;Naoaki Ide
Attorney & Agent: jiang fuhou
Abstract:
    In a digital copying machine using a multi-beam optical system, a sensor pattern SH for sensing the power of each of the light beams a to d scanning the surface of a photosensitive drum and sensor patterns SB1 to SF1, SB2 to SF2 for sensing the passing positions of the beams are provided in a light beam position sensing unit(38). The sensor patterns SB1 to SF1, SB2 to SF2 are arranged linearly in the sub-scanning direction at intervals corresponding to two resolutions. The power of each light beam on the surface to be scanned is controlled so as to be in a specific range. Even when the light beams are scanned with different resolutions, they can be controlled with high accuracy so as to constantly have an ideal positional relationship between them. This always assures high picture quality.
Time: 6
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