Scanning lens and scanning apparatus using scanning lens

Details Scanning lens and scanning apparatus using scanning lens Scanning lens and scanning apparatus using scanning lens

1990-08-10

1992-07-07

Arnold, Bruce Y.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359205, 359664, G02B 2608, G02B 300

Patent

active

051287951

ABSTRACT:
A scanning apparatus comprises a light source for emitting a light along an optical axis, a focusing lens for converting the light emitted from the light source into a convergent light, a deflector for deflecting the convergent light from the focusing lens so that a deflected light is scanned at a substantially uniform angular velocity on an image surface, the deflector having a deflection surface on which the convergent light is deflected, and a scanning lens for focusing the deflected light from the deflector so that a focused light is scanned on the image surface in a main scanning direction to form scanning spots thereon at a substantially uniform scanning rate, the scanning lens being made of a material with a refractive index n and constructed as a single lens having a focal length f. The scanning lens according to the present invention provides a well corrected curvature of field in the main scanning direction and at the same time a good scanning linearity.

REFERENCES:
patent: 4352541 (1982-10-01), Minoura et al.
patent: 4571035 (1986-02-01), Sakuma
patent: 4934772 (1990-06-01), Sakuma et al.
patent: 4962982 (1990-10-01), Takanashi
patent: 4971411 (1990-11-01), Takanashi

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