Photography – With exposure objective focusing means – focusing aid – or... – Having auxiliary illumination
Patent
1998-12-22
2000-12-05
Perkey, W. B.
Photography
With exposure objective focusing means, focusing aid, or...
Having auxiliary illumination
396124, G03B 1336
Patent
active
061577839
ABSTRACT:
An automatic focus adjusting device adapted to detect focus information of an objective lens on the basis of two images of a subject, comprises a photosensor having a number of pixels on which the two images are formed, a focus detecting area setup device for selectively setting up either of first and second focus detecting areas on said photosensor, the first focus detecting areas being initially set up and the second focus detecting areas being less in the number of pixels than the first focus detecting areas, an operation device for performing predetermined operations on outputs of the first focus detecting areas set up on the photosensor to provide focus information of the objective lens, an evaluator for evaluating whether the results of operations are proper or not, and a controller responsive to the evaluator for, when the results of operations are improper, causing the focus detecting area setup device to set up the second focus detecting areas on the photosensor and then causing the operation device to perform the operations on outputs of the second focus detecting areas. This device permits the time taken to detect the focus to be reduced without the need of making a low contrast scan even if the focus detection is impossible.
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Olympus Optical Co,. Ltd.
Perkey W. B.
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