Focus detecting apparatus detecting focus to a plurality of area

Details Focus detecting apparatus detecting focus to a plurality of area Focus detecting apparatus detecting focus to a plurality of area

1992-12-21

1994-05-10

Perkey, W. B.

G03B 1336

Patent

active

053112415

ABSTRACT:
Focus detecting apparatus detecting focus to a plurality of areas has (1) a first auto-focusing mode in which, regardless of an in-focus or out-of-focus state, an auto-focusing operation (including focus detection and driving of an optical system) are repeatedly performed, and (2) a second auto-focusing mode in which the auto-focusing operation is performed until an in-focus state is obtained and the auto-focusing operation is terminated after the in-focus state is detected. A sensor unit is provided for receiving light beams form a plurality of different areas in a photographic scene. A focus processing circuit is provided for, in the first auto-focusing mode, causing the auto-focusing operation to be performed on the basis of an output of a sensor unit representing a particular area of the plurality of areas as long as the output of said sensor unit which represent the particular area is appropriate. In the second auto-focusing mode, the processing circuit selects as a result of the focus detection operation a signal representing a particular focusing state among the focus state signals of each said area obtained by the focus detection operations performed on outputs of sensor units corresponding to each area of the photographic scene.

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