Laser beam scanning optical apparatus

Details Laser beam scanning optical apparatus Laser beam scanning optical apparatus

1997-03-11

1998-09-15

Phan, James

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359205, 359216, G02B 2608

Patent

active

058087753

ABSTRACT:
A laser beam scanning optical apparatus which has a laser source unit, a collimator lens, a cylindrical lens, a polygon mirror and a scanning lens with an f.theta. function. The collimator lens is a bifocal lens, and because of the bifocal collimator lens, a part of the laser beam is focused on a point before the surface of a photosensitive member, and another part of the laser beam is focused on a point after the surface of the photosensitive member. Also, the cylindrical lens can be a bifocal lens. In this case, even when the magnification ratio in the sub scanning direction is designed small, the focal length of the cylindrical lens does not have to be lengthened.

REFERENCES:
patent: 4720168 (1988-01-01), Kaneko
patent: 5155616 (1992-10-01), Yamaguchi et al.
patent: 5565668 (1996-10-01), Reddersen et al.
patent: 5610758 (1997-03-01), Sumi

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