Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1983-06-27
1986-05-06
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250201, 354402, 354406, G03B 310
Patent
active
045874166
ABSTRACT:
A focus detecting apparatus having an optical device movable to cause the light from an object to be imaged on a predetermined plane and comparing the different imaged conditions of the light from the object on the predetermined plane comprises a light intensity distribution detecting device for detecting the distribution of the intensity of light on the predetermined plane and putting out a detection signal indicative of the distribution of the intensity of light on the predetermined plane, a device for taking out a high frequency component from the detection signal, a device for rectifying the taken out high frequency component, a device for forming the envelope of the rectified high frequency component, a device for integrating the envelope at any time and putting out an integrated value, and a focus detecting device for detecting, on the basis of the integrated value of the envelope, the amount of movement necessary for the imaging optical device to cause the light from the object to be imaged on the predetermined plane.
REFERENCES:
patent: 4186301 (1980-01-01), Basire et al.
patent: 4311904 (1982-01-01), Okada et al.
patent: 4327284 (1982-04-01), Suzuki
Kawahara Atsushi
Kudo Koichi
Ogawa Hidehiro
Nippon Kogaku K. K.
Westin Edward P.
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