Method for detecting visibility of image of an object and a devi

Details Method for detecting visibility of image of an object and a devi Method for detecting visibility of image of an object and a devi

1974-10-15

1977-06-21

McGraw, Vincent P.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250204, 352140, 354 25, 354 31, 356125, G01J 120, G03B 708

Patent

active

040313832

ABSTRACT:
The present invention relates to a method and a device for detecting visibility of the image of an object for adjusting the focus of an optical system. The invention is especially suitable to an optical instrument such as camera, using photo-electric conversion elements having non-linear resistance -- intensity of illumination characteristics such as cadmium sulfide CdS or cadmium selenide CdSe, etc. The invention is characterized in that the photo-electric effect of the above mentioned photo-electric conversion elements will have mutually reverse characteristics depending on the properties inherent to the photo-electric conversion elements, to the arrangement of the electrode and the electric circuit, and further on the state of the image of an object formed on said photo-electric conversion elements. An electric circuit to enhance object image visibility is disclosed which makes use of these characteristics.

REFERENCES:
patent: 3274913 (1966-09-01), Biedermann et al.
patent: 3364815 (1968-01-01), Smith et al.
patent: 3469925 (1969-09-01), Urbach et al.
patent: 3493764 (1970-02-01), Craig

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