Focusing of optical viewing apparatus

Details Focusing of optical viewing apparatus Focusing of optical viewing apparatus

1981-05-11

1983-09-27

Corbin, John K.

350527, G02B 2106

Patent

active

044065264

ABSTRACT:
An optical viewing apparatus and method is disclosed having improved focusing, in which two beams of light, which are mutually inclined at a fixed angle, are converged in the vicinity of a reflective viewed surface, and the relative distance between the apparatus and the surface is adjusted until the beams coincide at the surface.

REFERENCES:
patent: 2968994 (1961-01-01), Shurcliff
patent: 3523736 (1970-08-01), Bottomley
patent: 3563665 (1971-02-01), Takahashi et al.
patent: 3721827 (1973-03-01), Reinheimer
patent: 3817619 (1974-06-01), Kawahara
patent: 3969575 (1976-07-01), Gerritsen et al.

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