Laser scanning apparatus

Details Laser scanning apparatus Laser scanning apparatus

2006-11-07

2006-11-07

Cherry, Euncha P. (Department: 2872)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

Reexamination Certificate

active

07133176

ABSTRACT:
A laser scanning apparatus scanning a bundle of light rays emitted from a light source of a monolithic multi-beam semiconductor laser in a main scanning direction by being reflected by a polygon mirror includes a first lens to focus the bundle of light rays emitted from the light source and a second lens guiding the bundle of light rays transmitted by the first lens toward a deflection surface of the polygon mirror. In the laser scanning apparatus, the multi-beam semiconductor laser is installed with an imaginary line drawn through light emitting points of the laser inclined with respect to the main scanning direction, the first lens is a convex lens having an anamorphic surface shape on at least one surface focusing the bundle of light rays in front of a slit only in the main scanning direction, and the second lens is a cylindrical lens making the bundle of light rays a bundle of parallel light rays or a bundle of concentrated light rays in the main scanning direction.

REFERENCES:
patent: 5805199 (1998-09-01), Aoki
patent: 6509995 (2003-01-01), Suzuki et al.
patent: 1-250922 (1989-05-01), None

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