Sharp focus detecting system

Details Sharp focus detecting system Sharp focus detecting system

1975-08-14

1978-08-01

Gonzales, John

354 56, 354 59, 354225, G03B 708

Patent

active

041046501

ABSTRACT:
A camera having an objective and visual or automatic focusing means for the objective. For assistance in bringing into sharpest focus an image of an object formed by the objective at the focal plane of the camera, there is provided a sharp focus detecting apparatus constructed in the form of an attachment unit attachable to and detachable from the camera and essentially comprising an optical system subsidiary to the objective, photoelectric means arranged upon receiving light coming from the object through the objective and subsidiary optical system for producing an electrical output signal proportional to the degree of sharpness of the image and oscillatory motion imparting means or scanning means associated with the photoelectric means for periodically varying the spatial relationship along the projection path between the photoelectric means and the subsidiary optical system.

REFERENCES:
patent: 3820129 (1974-06-01), Hosoe et al.
patent: 3827064 (1974-07-01), Kiyohara et al.
patent: 3830571 (1974-08-01), Imai et al.
patent: 3868711 (1975-02-01), Sekida et al.
patent: 3940777 (1976-02-01), Komine
patent: 3950764 (1976-04-01), Hosoe et al.
patent: 3967299 (1976-06-01), Shono

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