F.theta. lens system in a laser scanning unit

Details F.theta. lens system in a laser scanning unit F.theta. lens system in a laser scanning unit

1995-08-30

1997-05-20

Phan, James

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359207, 359216, 359217, 359662, 359710, 359711, 359717, 359793, G02B 2608

Patent

active

056317638

ABSTRACT:
An f.theta. lens system employing two f.theta. lenses in a laser scanning unit. According to the f.theta. lens system, a cheap plastic can be used for an f.theta. lens by lowering the refractive index of one of two f.theta. lenses and forming a toric face on one of total four refractive faces. Incident and emergent faces in the cross scan direction of a first f.theta. lens closer to a rotary polygon mirror has the curvature of .infin., and an incident face in the main scan direction of a second f.theta. lens closer to a photoconductive drum also has the curvature of .infin.. Thus, only an emergent face of the second f.theta. lens has a toric face.

REFERENCES:
patent: Re34438 (1993-11-01), Yamakawa
patent: 4818046 (1989-04-01), Kondo
patent: 5136418 (1992-08-01), Itabashi

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