Photography – With exposure objective focusing means – focusing aid – or... – Having accumulation photoarray and time control means
Patent
1995-09-19
1997-01-07
Perkey, W. B.
Photography
With exposure objective focusing means, focusing aid, or...
Having accumulation photoarray and time control means
396133, G03B 1336
Patent
active
055922546
ABSTRACT:
A photographing lens is driven on the basis of an operation result representing a focus condition of the photographing lens, which has been calculated on the basis of the output signal from an image sensor, when such operation result has been judged reliable. A so-called scanning operation is made, in which the photographing lens is driven in a specified direction to find out a location offering a reliable operation result, when said operation result has been judged not reliable. First and second setup modes are provided. In the first setup mode, the accumulation time of the image sensor is set on the basis of the previously set accumulation time and the output signal of the image sensor obtained during said previously set accumulation time. In the second setup mode, the accumulation time of the image sensor is set according to the output of the monitor sensor arranged in the vicinity of a plurality of photoelectric elements and detecting the intensity of the light incidental to the image sensor. When the second setup mode is selected and the output signal of the image sensor does not satisfy the predetermined condition, no scanning operation is made even if the operation result is judged not reliable.
REFERENCES:
patent: 4561749 (1985-12-01), Utagawa
patent: 4922279 (1990-05-01), Hamada et al.
patent: 4977311 (1990-12-01), Kusaka et al.
patent: 5068682 (1991-11-01), Utagawa
patent: 5138357 (1992-08-01), Utagawa
Nikon Corporation
Perkey W. B.
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