Apparatus for detecting a condition of sharpest focus

Details Apparatus for detecting a condition of sharpest focus Apparatus for detecting a condition of sharpest focus

1983-08-18

1985-08-20

Hix, L. T.

354409, G03B 1320

Patent

active

045360731

ABSTRACT:
A real image of an object is projected by an objective lens to at least a pair of photosensitive elements on opposite side of a prescribed focal plane, wherein use is made of a secondary image forming lens between the objective lens and the pair of photosensitive elements to achieve a great increase in the range of detection of in-focus condition.

REFERENCES:
patent: 3614921 (1971-10-01), Yamanaka et al.
patent: 3827064 (1974-07-01), Kiyohara et al.
patent: 4019049 (1977-04-01), Schulz

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