Optical element and a scanning optical apparatus using the same

Details Optical element and a scanning optical apparatus using the same Optical element and a scanning optical apparatus using the same

1996-05-24

1999-10-12

Wong, Peter S.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

347259, 359216, 359820, G02B 2608, G02B 702

Patent

active

059661615

ABSTRACT:
An optical element and a scanning optical apparatus using the same capable of correcting for image plane re-positioning caused by internal distortion of the optical element, particularly, refractive index distribution caused by forming the optical element by plastic molding. The optical element has an internal refractive index distribution such that the focal length calculated based on the curvature of the plane thereof, the refractive index of the material, and the thickness along the optical axis, is shorter than the focal length actually measured. The element may be used in the scanning optical apparatus, may be provided with planes of different curvatures in a generating line and a line perpendicular thereto, and may be longer in the generating line.

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A. Arimoto, et al., "Laser scanning system using a rotationally asymmetric aspheric surface", Applied Optics, vol. 30, No. 6, Feb. 20, 1991, pp. 699-704.

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