Optical scanning apparatus

Details Optical scanning apparatus Optical scanning apparatus

1996-10-24

1998-08-11

Phan, James

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359217, G02B 2608

Patent

active

057935157

ABSTRACT:
An optical scanning apparatus includes: a rotational polygonal mirror, on the side of which a plurality of reflecting surfaces are provided, the reflecting surfaces deflecting a beam of incident light in the primary scanning direction at a substantially equal angular velocity; a first optical system for forming a beam of light sent from the light source into an image long in the primary scanning direction in such a manner that the formed image strides over the plurality of deflecting surfaces; and an f.theta. lens for converging the beam of light deflected on the deflecting surface at a position close to the surface of the photoreceptor drum so that a spot of light irradiated on the photoreceptor drum can be moved at a substantially equal speed. In the optical scanning apparatus, the angles .alpha. and .beta. satisfy the following expression:

REFERENCES:
patent: 3944323 (1976-03-01), Starkweather
patent: 5204769 (1993-04-01), Matsumoto et al.
patent: 5270849 (1993-12-01), Bock et al.
patent: 5337182 (1994-08-01), Tomita

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