Optical beam scanning unit with slit for producing horizontal sy

Details Optical beam scanning unit with slit for producing horizontal sy Optical beam scanning unit with slit for producing horizontal sy

1995-07-05

1997-09-02

Le, Que

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

359196, H01J 314

Patent

active

056635583

ABSTRACT:
A laser generation unit 20 emits a laser beam. A polygon mirror 27 deflects the laser beam to irradiate an image forming surface in horizontal scans. A beam detection mirror 25 reflects the laser beam at a start of each horizontal scan. A slit body 36 has a slit 44 oriented so the laser beam passes therethrough after being reflected off the mirror. A sensor 26 is disposed so that the laser beam falls incident thereon after passing through the slit 44. Light-obstructing walls 35a and 35b of the slit body 36 are slanted an appropriate angle with regards to an optical axis of the laser beam from the beam detection mirror 25. When reflected at the surfaces of the light-obstructing walls, the laser beam will not directly return to the beam detection mirror 25 and then to the polygon mirror 27. Any ghost images will not be formed on the image forming surface.

REFERENCES:
patent: 4404571 (1983-09-01), Kitamura
patent: 5289000 (1994-02-01), Toyofuku
patent: 5412201 (1995-05-01), Fukuzawa et al.

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