Tilt correcting optical system

Details Tilt correcting optical system Tilt correcting optical system

1997-12-31

1999-11-09

Phan, James

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359205, 359207, 359208, 359216, G02B 2608

Patent

active

059825235

ABSTRACT:
In a light beam scanning system, a light beam deflected by a deflector is focused to form an image on a surface and the image is caused to scan the surface at a constant speed. A tilt correcting optical system for compensating for surface tilt in the deflector includes an optical element which is disposed between the deflector and the surface to be scanned and reflects the light beam, deflected by the deflector, to converge on the surface in a direction perpendicular to the direction in which the image scans the surface. The optical element is an in-mirror lens which has a refracting surface at its front face and has a reflecting surface at its rear end face. The refracting surface and the reflecting surfaces are both cylindrical and concave toward the deflector and the radius of curvature of the refracting surface is smaller than that of the reflecting surface.

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