Post-objective type optical scanner and image forming apparatus

Details Post-objective type optical scanner and image forming apparatus Post-objective type optical scanner and image forming apparatus

1991-01-17

1992-02-18

Gonzalez, Frank

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359217, G02B 2610

Patent

active

050899074

ABSTRACT:
A high-resolution post-objective type optical scanner in which a beam of light is scanned by an optical deflector onto a scanning surface after it is converged by a condensing lens, the light beam converged on the scanning surface having a spot size with an intensity of 1/e.sup.2 and not exceeding 80 .mu.m over the entire area of the scanning surface. The optical deflector includes a reflecting surface composed of a cylindrical surface or a spherical surface. A compensating lens disposed between the optical deflector and the scanning surface has a power which varies in the scanning direction between a central portion and a peripheral portion of the compensating lens. The distance r between an axis of rotation of the optical deflector and a deflecting point, the distance L between the deflecting point and the scanning surface, and an effective scanning width Y.sub.O are related by the relationship r.gtoreq.-0.025.times.L+0.1.times.Y.sub.o +1.4. An image forming apparatus using post-objective type optical scanner is also disclosed.

REFERENCES:
patent: 4818046 (1989-04-01), Kondo
patent: 4852957 (1989-08-01), Nakimoto et al.
patent: 4873435 (1989-10-01), Ono et al.
patent: 4915465 (1990-04-01), Sugiura
patent: 4982205 (1991-01-01), Hasegawa
patent: 5031979 (1991-07-01), Itabashi

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