Facsimile and static presentation processing – Facsimile – Picture signal generator
Patent
1997-06-02
1999-11-30
Mancuso, Joseph
Facsimile and static presentation processing
Facsimile
Picture signal generator
358475, 250235, H04N 104, H01J 314
Patent
active
059952466
ABSTRACT:
In a digital copying mechine using a multi-beam optical system, first light receiving elements of a light beam detector placed on the extension of the surface of a photosensitive drum detects the positions of paths of scanning light beams in the sub-scanning direction. On the basis of the results of this detection, the amount of control for the position of the path of each light beam is calculated. Galvano mirrors, adapted to reflect the light beams onto the surface of the photosensitive drum, are driven accordingly, so that the paths of the light beams are properly positioned in the sub-scanning direction. Second light receiving elements of the light beam detector detect times at which the light beams move across the light beam detector. A sync clock is produced after a delay from when each light beam moves across the light beam detector. The spacing between each second light receiving element is set to an integral multiple of the length of one dot formed by a light beam on the photosensitive drum in the main scanning direction. In synchronism with the sync clocks, pixel clocks and image data are applied to laser oscillators to form an image on the surface of the photosensitive drum. A light beam scanning apparatus is provided which can properly control the positions of lines scanned by the light beams on the photosensitive drum surface and hence can maintain high image quality at all times.
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Ide Naoaki
Komiya Kenichi
Sakakibara Jun
Tanimoto Koji
Kabushiki Kaisha Toshiba
Mancuso Joseph
Truong Hien
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