Optical scanning device, mirror objective suitable for use in sa

Details Optical scanning device, mirror objective suitable for use in sa Optical scanning device, mirror objective suitable for use in sa

Filed on

1989-03-07

Date issued

1990-05-08

Examiner

Nelms, David C.

Patent Class

Radiant energy

SubClass

Photocells; circuits and apparatus

SubSubClass

Optical or pre-photocell system

Other Related Categories

350443, 35016221, H01J 314

Type

Patent

Status

active

Patent number

049240820

Description

ABSTRACT:
An optical scanning device having a mirror-objective arranged between a radiation source and an object to be scanned, which mirror objective is a radiation-transparent body having a radiation window and concentric reflector on each of two opposite surfaces of such body. By providing at least one of the windows with an aspherical shape, the mirror objective is well corrected for spherical aberrations without imposing stringent requirements on the accuracy of such aspherical shape.

REFERENCES:
patent: 3825322 (1974-07-01), Mast
patent: 4554448 (1985-11-01), Sillitto
patent: 4835378 (1989-05-01), Coops
patent: 4835380 (1989-05-01), Opheij et al.

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