Light beam scanning device

Details Light beam scanning device Light beam scanning device

1994-01-21

1995-05-23

Ben, Loha

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359205, 359207, 359217, G02B 2608

Patent

active

054186390

ABSTRACT:
A light beam scanning device in which two image formation lenses are disposed between a rotational polygonal mirror to reflect a light beam sent from a laser beam source, and a surface to be scanned. An image is formed on the scanned surface by the reflected light beam. A reflecting surface of the mirror and the scanned surface are approximately set in a geometrical-optical conjugate relation. The lens includes a surface on which a change in the radius of curvature in a secondary scanning direction is non-symmetrical with respect to the distance h from the optical axis. When rh(+) is defined as the radius of curvature in the secondary scanning direction section parallel to the optical axis at a position distant from the optical axis by h in the direction of "+" in the primary scanning direction, and rh(-) is defined as the radius of curvature in the secondary scanning direction section parallel to the optical axis at a position distant from the optical axis by h in the direction of "-" in the primary scanning direction, rh(+) and rh(-) are expressed by the following equation:

REFERENCES:
patent: 5025268 (1991-06-01), Arimoto et al.

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