Recorders – Printing – dotting – or punching marker – Ink transfer support or moving means
Patent
1989-07-07
1990-12-18
Reinhart, Mark J.
Recorders
Printing, dotting, or punching marker
Ink transfer support or moving means
350 65, 358302, G02B 2608, G01D 1516
Patent
active
049789775
ABSTRACT:
A laser scanning optical system including a rotatable polygonal mirror for scanning the photosensitive surface with the laser beam in a scanning direction, a lens unit for converging the laser beam reflected by the polygonal mirror on the photosensitive surface, a first reflection mirror for reflecting the laser beam passed though the lens unit to the photosensitive surface, a second reflection mirror for reflecting the laser beam reflected by a part of the first reflection mirror, a sensor arranged to receive the laser beam which is reflected by the second reflection mirror and has passed through a specific position equivalent to the photosensitive surface for generating a synchronizing signal for commanding start of modulation of the laser beam, and first and second lens elements both interposed between the specific position and the sensor so as to keep a conjugate condition therebetween. The first lens element has a positive power only in the direction perpendicular to the scanning direction and provides a magnification smaller than 1 in the direction perpendicular to the scanning direction, while the second lens element has a positive power only in the scanning direction and provides a magnification greater than 1 in the scanning direction.
REFERENCES:
patent: 4084197 (1978-04-01), Starkweather
patent: 4731623 (1988-03-01), Oda et al.
patent: 4733307 (1988-03-01), Watanabe
Hasegawa Hirofumi
Kojima Hiroaki
Matsuura Yasuhiro
Ohmori Naoto
Yamada Yukio
Minolta Camera Kabushiki Kaisha
Reinhart Mark J.
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