Light beam scanning apparatus and light beam adjusting mechanism

Details Light beam scanning apparatus and light beam adjusting mechanism Light beam scanning apparatus and light beam adjusting mechanism

1990-06-28

1991-12-10

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

346108, 359213, H01J 314, G01D 942

Patent

active

050721143

ABSTRACT:
The improved compact and inexpensive light beam scanning apparatus capable of scanning with a light beam for image recording or reading in an easy and yet precise manner has a first light source for emitting a scanning light beam that is positioned in the center of the optical unit in the apparatus, as well as a second light source for emitting a light beam to scan an image sync signal generating means for obtaining an image sync signal, which second light source is positioned either ahead of or behind said first light source in a sub-scanning direction. This arrangement obviates the use of heretofore necessary expensive optical elements such as AOM and those for synthesizing or separating light beams, whereby a smaller number of parts need be used than in the prior art. The positions of the respective light sources can be easily adjusted by a light beam adjusting mechanism of a simple design in which the sleeves for retaining these light sources are adapted to be movable relative to each other.

REFERENCES:
patent: 4297713 (1981-10-01), Ichikawa et al.
patent: 4383755 (1983-05-01), Fedder et al.
patent: 4563056 (1986-01-01), Tagawa et al.
patent: 4796964 (1989-01-01), Connell et al.
patent: 4837588 (1989-06-01), Imakawa et al.
patent: 4853535 (1989-08-01), Suganuma
patent: 4908511 (1990-03-01), Ishikawa et al.

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