Focus detecting device

Details Focus detecting device Focus detecting device

1978-04-03

1980-01-15

Hix, L. T.

Optics: motion pictures

Removable film strip magazine type

354 31, 352140, 352139, G03B 1318

Patent

active

041836413

ABSTRACT:
In an automatic focus detecting device in which a vibrating prism is provided on the focal plane of an objective of an optical instrument such as a camera, a photodetector element used for detecting focus is composed of a central element functioning as a main photodetector and a marginal element or elements functioning as a sub-photodetector. The marginal element detects the vibration of the image of a non-principal subject matter existing in the vicinity of a principal subject matter. The central element detects the vibration of the image of the principal subject matter. The output of the marginal element is used to compensate for the noise in the output of the central element.

REFERENCES:
patent: 2258903 (1941-10-01), Mitchell
patent: 3367254 (1968-02-01), Townsley
patent: 3631785 (1972-01-01), Perlman et al.
patent: 3691922 (1972-09-01), Konig
patent: 3896457 (1975-07-01), Yamanishi et al.
patent: 3950764 (1976-04-01), Hosoe et al.
patent: 3988747 (1976-10-01), Lermann et al.
patent: 4060725 (1977-11-01), Hoshika
patent: 4090209 (1978-05-01), Kondo
patent: 4114994 (1978-09-01), Kondo
Automatic Focusing, Peter MacKeith, Brit. J. of Photo., 4 Jul. 1975, pp. 594-596.

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