Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1981-08-13
1984-08-21
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
354402, G03B 310
Patent
active
044671873
ABSTRACT:
In an automatic continuous focusing device, two detected images of an object formed by a distance detection optical system with a relative distance therebetween associated with the object distance are scanned, the obtained scanning signals are quantized to generate quantized picture element data, the relative distance between the two detected images is detected on the basis of the quantized picture element data, and an imaging optical system to be focused on the object is controlled according to the detection result. The device also provides for invalidating the control of the imaging optical system when the results of detection of the quantized condition of the scanning signals indicate that the quantized condition of the scanning signals for at least one of the two detected images is not sound or reasonable.
REFERENCES:
patent: 4004852 (1977-01-01), Pentecost
patent: 4078171 (1978-03-01), Stauffer
patent: 4085320 (1978-04-01), Wilwerding
patent: 4247762 (1981-01-01), Wilwerding
patent: 4257705 (1981-03-01), Hosoe et al.
Amikura Takashi
Tsunekawa Tokuichi
Canon Kabushiki Kaisha
Nelms David C.
Westin Edward P.
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