Preobjective scanning system

Details Preobjective scanning system Preobjective scanning system

1988-05-09

1989-07-18

Arnold, Bruce Y.

350 67, G02B 934, G02B 2610

Patent

active

048488852

ABSTRACT:
A preobjective scanning optical system for use with a rotating mirror scanner employing LEDs or lasers to electronically reproduce photographs. The optical system includes a doublet disposed before the mirror and a triplet disposed after the mirror. Instead of collimating, the first optical system along with the mirror forms a virtual, image of the LEDs or lasers which travels along a curved path as the scanner rotates and includes a first and a second lens which, in combination, correct the image for on-axis spherical and axial color aberrations. The triplet has net positive power and its three lenses, in combination, correct for off-axis aberrations such as astigmatism, coma, and lateral color aberration but can be under-corrected for field curvature because its object is the curved virtual image.

REFERENCES:
patent: 4241257 (1980-12-01), Koester
patent: 4497546 (1985-05-01), Kobayashi

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