Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1975-07-08
1977-08-02
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250209, 250214P, 354 25, G01J 120
Patent
active
040398242
ABSTRACT:
A focus detecting photoelectric device herein disclosed is usable in a focus control system and is placed on an image plane where an optical image of a subject to be, for example, photographed through an objective lens assembly is focused to detect whether the image has been exactly focused or whether the image is out of focus. An output signal from the photoelectric device herein disclosed is used to control the focus control system to effect the desired focus control in relation to the objective lens assembly. To this end, the focus detecting photoelectric device is composed of at least one group of photoelectric elements, such as photodiodes, connected in series to each other with the cathode of one photoelectric element connected to the anode of the other photoelectric element. These photoelectric elements of the group may be formed on a semiconductor substrate in a predetermined pattern by the use of a known IC circuit making technique.
REFERENCES:
patent: 3631785 (1972-01-01), Perlman et al.
patent: 3714524 (1973-01-01), Katsuyama
patent: 3723003 (1973-03-01), Vockenhuber et al.
patent: 3736057 (1973-05-01), Harvey
patent: 3844658 (1974-10-01), Gela et al.
patent: 3906389 (1975-09-01), Matsumoto et al.
Minolta Camera Kabushiki Kaisha
Nelms David C.
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