Wobble correction lens with binary diffractive optic surface and

Details Wobble correction lens with binary diffractive optic surface and Wobble correction lens with binary diffractive optic surface and

1991-12-24

1993-05-04

Arnold, Bruce Y.

Optical: systems and elements

Diffraction

From grating

359569, 359741, 359742, G02B 2742

Patent

active

052087018

ABSTRACT:
A wobble correction lens for a raster output scanner combines a positive cross-scan plano-cylindrical lens, which provides most of the optical power for focusing the light beam to a scan line, with a diffractive surface, which corrects the cross-scan field curvature of the cross-scan plano-cylindrical lens. The diffractive surface will have a multi-level structure (binary diffractive optical surface) which possesses a diffractive phase function that will flatten the cross-scan field curvature of the plano-cylindrical lens.

REFERENCES:
patent: 3918792 (1975-11-01), Beecher
patent: 4749255 (1988-06-01), Chaurabarti et al.
patent: 4846552 (1989-07-01), Veldkamp et al.
patent: 5016977 (1991-05-01), Baude et al.
patent: 5044706 (1991-09-01), Chen
patent: 5081639 (1992-01-01), Snyder et al.
Veldkamp et al., "Binary Optics", Scientific American, May 1992, pp. 92-97.
G. J. Swanson, "Binary Optics Technology: The Theory and Design of Multi-level Diffractive Optical Elements", Massachusetts Institute of Technology Lincoln Laboratory Technical Report 854, Aug. 14, 1989.

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