Automatic focusing device

Details Automatic focusing device Automatic focusing device

1985-04-16

1986-02-25

Perkey, William B.

3541951, G03B 310

Patent

active

045726426

ABSTRACT:
What the present invention discloses is that in such a lens system that the degree of focus of an object image on the focal plane is decreased by zooming, when the decrease in the degree of focus of the object image by zooming is large, the zooming operation, or the speed of variation of the focal length is made slower.

REFERENCES:
patent: 3972056 (1976-07-01), Tsujimoto et al.
patent: 4002405 (1977-01-01), Stahl
patent: 4083057 (1978-04-01), Quinn
patent: 4473743 (1984-09-01), Ishikawa

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