Automatic focusing camera

Details Automatic focusing camera Automatic focusing camera

1989-06-12

1991-07-09

Perkey, W. B.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

2502012, G03B 1336, G02B 728

Patent

active

050309811

ABSTRACT:
An automatic focusing camera includes a sensor for detecting an amount and a direction of difference between an image forming position of light from an object being photographed and a film surface to drive a taking lens in response to the measured outputs and focus determining capability which gives a decision of in-focus when the amount of difference is less than a first automatic focusing threshold. A focusing operation is achieved such that, comparing the amount of difference determined by the sensor with a second automatic focusing threshold of a standard value which is larger than the first automatic focusing threshold, when the amount is less than the second threshold and a direction of difference last measured and that presently measured are the same, a taking lens driving is continued to complete a focusing operation and when the directions are different from each other, the measurement is resumed after the next driving of the taking lens even when the amount is less than the second threshold.

REFERENCES:
patent: 4508443 (1985-04-01), Matsuzaki et al.
patent: 4537487 (1985-08-01), Taniguchi et al.
patent: 4671640 (1987-06-01), Akada et al.
patent: 4743931 (1988-05-01), Matsuzaki et al.

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