Optical element and scanning optical apparatus using the same

Incremental printing of symbolic information – Light or beam marking apparatus or processes – Scan of light

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347258, B41J 1514

Patent

active

061542458

ABSTRACT:
An optical element which is a resinous optical element has optical surfaces longitudinal in a main scanning direction. A shape in the main-scanning direction of an image-ineffective portion of at least one optical surface out of image-effective portions and image-ineffective portions of the both optical surfaces of the optical element includes a shape formed by adding a spline function to a function representing a shape in the main-scanning direction of the image effective portion. Thicknesses in the optical-axis direction in the image-ineffective portions are set by addition of the spline function.

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patent: 5875051 (1999-02-01), Suzuki et al.

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