1990-02-28
1991-07-23
Hix, L. T.
354403, G03B 1300
Patent
active
050347683
ABSTRACT:
An automatic focusing device for a camera comprises a distance measuring mechanism for calculating the distance to an object by performing distance measurement a plurality of times and a focusing lens driving mechanism for moving a focusing lens to a position where it is focused on the object on the basis of the object distance calculated by the distance measuring mechanism. A field depth detecting device for detecting the depth of field of a photographing lens is provided. A device setting the number of times that distance measurement is performed by the distance measuring mechanism in accordance with the depth of field detected by the field depth detecting device is provided in such a manner that, if the depth of field detected is relatively great, the number of times that distance measurement is performed is set to a relatively small number, whereas, if the depth of field detected is relatively shallow, the number of times that distance measurement is performed is set to a relatively large number.
REFERENCES:
patent: 4320946 (1982-03-01), Aoki et al.
patent: 4344679 (1982-08-01), Yagi et al.
patent: 4545665 (1985-10-01), Aihaia
patent: 4571046 (1986-02-01), Suzuki et al.
patent: 4627700 (1986-12-01), Nakamura et al.
Asahi Kogaku Kogyo Kabushiki Kaisha
Gray David M.
Hix L. T,.
LandOfFree
Automatic focusing device for a camera does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Automatic focusing device for a camera, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic focusing device for a camera will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-435623