Camera

Details Camera Camera

1999-04-28

2000-08-22

Adams, Russell

Photography

With exposure objective focusing means, focusing aid, or...

396106, 396111, 396128, G03B 1318

Patent

active

061084956

ABSTRACT:
In addition to a focus detecting sensor for phase difference detection, a camera is provided with a light source or a generator for emitting light or ultrasonic waves, and a light receiver or a receiver for receiving the light or the ultrasonic waves reflected from the object. The distance to the object is detected from the intensity of the reflected light or ultrasonic waves and the focusing lens is set at a position close to the in-focus position. Then, the driving range of the focusing lens is limited in accordance with the detected distance, and from the set focusing lens position, focusing by the phase difference detection method is performed within the limited driving range.

REFERENCES:
patent: 4488787 (1984-12-01), Osawa
patent: 5121153 (1992-06-01), Yamada et al.
patent: 5597999 (1997-01-01), Kinba et al.
patent: 5652926 (1997-07-01), Saito
patent: 5655160 (1997-08-01), Saito
patent: 5737645 (1998-04-01), Saito
patent: 5870178 (1999-02-01), Akira
patent: 5915233 (1999-06-01), Nonaka
Camera Review, "Technical Report", No. 30, Jul. 1983, pp. 65-68.

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