f-.theta. Lens for use in a light beam scanning device

Details f-.theta. Lens for use in a light beam scanning device f-.theta. Lens for use in a light beam scanning device

1988-02-17

1988-12-06

Corbin, John K.

350 61, 350 68, 350479, G02B 904, G02B 906, G02B 2610

Patent

active

047892307

ABSTRACT:
An f.theta. lens for use in a light beam scanning device is constituted by a meniscus lens having a small power and located on the side of a deflection point, and a planoconvex lens having a large power and disposed with its convex surface on the side of a surface to be scanned. The lenses are constructed to satisfy the following conditions:

REFERENCES:
patent: 3973833 (1976-08-01), Lawson
patent: 4179183 (1979-12-01), Tateoka et al.
patent: 4277128 (1981-07-01), Kawamura
patent: 4343531 (1982-08-01), Tateoka et al.
patent: 4512625 (1985-04-01), Brueggemann
patent: 4571035 (1986-02-01), Sakuma
patent: 4645311 (1987-02-01), Rothe
patent: 4707085 (1987-11-01), Takanashi et al.
patent: 4712884 (1987-12-01), Sakuma et al.

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