Image forming light scanning apparatus

Details Image forming light scanning apparatus Image forming light scanning apparatus

1996-03-21

1998-02-24

Phan, James

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359207, 359212, 359216, 359662, G02B 2608

Patent

active

057216312

ABSTRACT:
A scanning apparatus has a luminous flux deflector and a single f.theta. lens. The deflector deflects a convergent luminous flux on a scanned surface at a uniform angular velocity. The f.theta. lens is arranged between the deflector and the scanned surface. The f.theta. lens is bi-convex in a main scanning direction and is made of a material having a refractive index of at most 1.6. One surface of the f.theta. lens in a main scanning direction is so curved that a radius of curvature in the main scanning direction decreases as an angle of view in the main scanning direction increases.

REFERENCES:
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patent: 4962982 (1990-10-01), Takanashi
patent: 4971411 (1990-11-01), Takanashi
patent: 5025268 (1991-06-01), Arimoto et al.
patent: 5111219 (1992-05-01), Makino
patent: 5128795 (1992-07-01), Endou et al.

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