Automatic focusing apparatus using ultrasonic wave

Details Automatic focusing apparatus using ultrasonic wave Automatic focusing apparatus using ultrasonic wave

1983-05-12

1984-12-11

Adams, Russell E.

G03B 310

Patent

active

044874944

ABSTRACT:
An automatic focusing apparatus using an ultrasonic wave wherein the ultrasonic wave is used to measure the distance to an object by plural times, a plurality of distance data obtained through the plurality of distance measuring operations are compared to each other, each of the plurality of distance data is checked for its effectiveness on the basis of the result of the comparison to provide a single of highly trustworthy information indicative of the distance to the object, and the information is used for automatic focal point adjustment of a taking lens.

REFERENCES:
patent: 4309098 (1982-01-01), Shenk
patent: 4336987 (1982-06-01), Shenk

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