Patent
1993-02-05
1994-05-10
Perkey, W. B.
G03B 1336
Patent
active
053112423
ABSTRACT:
An autofocus camera includes a photographing lens which is electrically driven. A range finding unit emits a pulse beam to an object and receives a reflection beam from the object, thereby outputting a signal representing the distance between the range finding unit and the object. A first range finding operation control unit responds to half-depression of a release button, and activates the range finding unit to obtain a first range output. A first drive control unit responds to full-depression of the release button, and drives the photographing lens on the basis of the first range output from the first range finding operation control means, thus performing a first lens driving operation. A second range finding operation control units activates the range finding unit to obtain a second range output either before or after the first lens driving operation is completed. A timer measures a time interval between the time point of the first range finding operation and the time point of the second range finding operation, thereby outputting count time data. A second drive control unit estimates the distance to the object at the time of operating a shutter, on the basis of the first range output and second range output and the count time data, and re-driving the photographing lens.
REFERENCES:
patent: 5136148 (1992-08-01), Nonaka
patent: 5216460 (1993-06-01), Yoshimura et al.
patent: 5255045 (1993-10-01), Nonaka
Olympus Optical Co,. Ltd.
Perkey W. B.
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