Photographic camera

Details Photographic camera Photographic camera

G - Physics

03

B

95/62

G03B 13/00 (2006.01) G02B 7/40 (2006.01) G03B 19/07 (2006.01)

Patent

CA 1157698

6327-CAN ABSTRACT OF THE DISCLOSURE An automatic focusing control apparatus focuses subjects in any one of a plurality of different camera-to- subject distance ranges by transmitting a sonar ranging signal and at the same time displacing an objective lens to move through a plurality of different focal positions corresponding respectively to the different camera-to- subject distance ranges, and thereafter detecting an echo signal from a subject and utilizing the detected echo signal to provide a specially timed control signal to ultimately stop the displacement of the objective lens at the appropriate focal position corresponding to the distance range in which the subject is located.

378869

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