Laser beam scanning device and apparatus provided with a laser b

Details Laser beam scanning device and apparatus provided with a laser b Laser beam scanning device and apparatus provided with a laser b

1995-12-07

1999-05-04

Moore, David K.

Image analysis

Image sensing

359208, 359217, G06K 700, G02B 2608

Patent

active

059012560

ABSTRACT:
A laser beam scanning device which has an improved cylindrical mirror in an optical path from a laser source unit to a polygonal mirror. The cylindrical mirror has a finite radius of curvature only in a sub scanning direction, and the radius of curvature in the sub scanning direction varies in a main scanning direction such that the closer to a laser beam incident side, the larger and the closer to a laser beam emergent side, the smaller. The laser beam reflected by the cylindrical mirror is converged on a line substantially parallel to each reflective facet of the polygonal mirror.

REFERENCES:
patent: 4893003 (1990-01-01), Hays
patent: 5142403 (1992-08-01), Ossman
patent: 5373390 (1994-12-01), Sakuma
patent: 5583559 (1996-12-01), Nakamura et al.

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