Optical scanner with large depth of focus

Details Optical scanner with large depth of focus Optical scanner with large depth of focus

1975-04-28

1976-11-02

Corbin, John K.

Optics: measuring and testing

Range or remote distance finding

With photodetection

350 7, 350204, 356167, G02B 2717

Patent

active

039893480

ABSTRACT:
An optical scanner for focusing an optical beam on a surface, which may be at any of a range of distances, utilizes a plurality of optical plates. The plates, which are of different thicknesses, are selectively insertable in the optical beam path to focus the beam at the surface according to the particular distance thereof.

REFERENCES:
patent: 2244687 (1941-06-01), Goldsmith et al.
patent: 3514182 (1967-11-01), Banks
patent: 3658419 (1972-04-01), Simonsson
patent: 3720454 (1973-03-01), Inderheese
patent: 3904870 (1975-09-01), Stauffer

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