Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1997-01-03
1998-05-26
Phan, James
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359206, 359207, 359216, 359217, G02B 2608
Patent
active
057575339
ABSTRACT:
An optical scanner including a semiconductor laser device, aperture, collimator, cylindrical lens, polygonal mirror and one f.theta. lens element molded from plastics. The first surface of the f.theta. lens in a deflecting plane (or the plane formed by the principal rays of light as deflected by the polygonal mirror) is aspheric whereas the second lens surface is toric. When taken in the deflecting plane, the first lens surface has a positive value of the near-axis radius of curvature and, hence, it is convex toward the polygonal mirror. Taken in a plane crossing the deflecting plane at right angles, the first lens surface forms an arc of a circle having a negative value of the radius of curvature and, hence, it is concave toward the polygonal mirror. When taken in the deflecting plane, the second lens surface forms an arc of a circle having a negative value of the radius of curvature and, hence, it is convex toward the scanning surface.
REFERENCES:
patent: 4447112 (1984-05-01), Matsuoka et al.
patent: 4799747 (1989-01-01), Yamakawa
patent: 4915484 (1990-04-01), Yamamoto
patent: 4962982 (1990-10-01), Takanashi
patent: 5136416 (1992-08-01), Shiraishi
Fuji 'Xerox Co., Ltd.
Phan James
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