Optical scanning device including mirror objective having two wi

Details Optical scanning device including mirror objective having two wi Optical scanning device including mirror objective having two wi

1989-12-13

1991-07-02

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

2502015, H01J 314

Patent

active

050292552

ABSTRACT:
An optical scanning device is described with a mirror-objective (30) arranged between a radiation source (40) and an object (10) to be scanned, which mirror objective comprises two radiation windows (31, 34) and two reflectors (32, 33). By giving one of the windows (31, 34) an aspherical shape, the mirror objective is well corrected for spherical aberrations, while no stringent requirements need to be imposed on the accuracy of the shape of the aspherical surface (35).

REFERENCES:
patent: 3825322 (1974-07-01), Mast
patent: 4835378 (1989-05-01), Coops
patent: 4835380 (1989-05-01), Opheij et al.
patent: 4924082 (1989-05-01), Opheij et al.

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