Title: Focus detecting photoelectric device

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.

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Inventors: Nanba, Yasuhiro (Sennan, JA)

Application Number: 594075
Filing Date: 1975-07-08
Publication_date: 1977-08-02
Assignee: Minolta Camera Kabushiki Kaisha (Osaka, JA)
Primary Class(es): 250/201.7 250/214P, 396/89
Other Classes:
US Patent Ref:

3631785	Jan, 1972	Perlman et al.	250/204.
3714524	Jan, 1973	Katsuyama	250/201.
3723003	Mar, 1973	Vockenhuber et al.	356/4.
3736057	May, 1973	Harvey	250/201.
3844658	Oct, 1974	Gela et al.	250/201.
3906389	Sep, 1975	Matsumoto et al.	354/25.

Other Refs:
Primary Examiner: Nelms, David C.
Assistant Examiner:
Attorney: Wenderoth, Lind & Ponack