Optical unit for use in laser beam printer apparatus

Details Optical unit for use in laser beam printer apparatus Optical unit for use in laser beam printer apparatus

1992-03-20

1993-11-30

Ben, Loha

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359218, G02B 2608

Patent

active

052670759

ABSTRACT:
An optical unit includes a primary lens for converging a laser beam L emitted from a semiconductor laser element, a cylindrical lens for further converging the converged laser beam, and first and second plastic lenses having optical characteristics offsetting each other in at least one of first and second directions perpendicular to each other. By virtue of the primary lens and cylindrical lens, devices included in the optical deflector on the front side thereof can be made small, and also the arrangement of the lenses can be simplified. Devices of the same on the rear side thereof incorporate lenses including a planar surface, which reduces the required manufacturing cost.

REFERENCES:
patent: 4447112 (1984-05-01), Matsuoka et al.
patent: 4523801 (1985-06-01), Baba et al.
patent: 4643516 (1987-02-01), Ogura
patent: 4715699 (1987-12-01), Morimoto
patent: 4733064 (1988-03-01), Ishikawa
patent: 4998790 (1991-03-01), Iizuka et al.
patent: 5005928 (1991-04-01), Suzuki et al.
patent: 5081544 (1992-01-01), Kikuchi et al.

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