Camera having a zoom lens unit

Details Camera having a zoom lens unit Camera having a zoom lens unit

1991-07-09

1992-10-20

Adams, Russell E.

35419512, G03B 1300

Patent

active

051574322

ABSTRACT:
An automatic focusing apparatus according to the present invention comprises a photo-taking lens system, in which a focus has to be adjusted every time the focal length is changed, including at least a first lens unit for changing the focal length by means of its movement along an optical axis of the photo-taking lens during the zooming operation and a second lens unit for adjusting the focus by means of its movement along the optical axis, and a controller for controlling the speed of the second lens unit during the zooming operation based on the focal length of the photo-taking lens system, the lapse of the time related with focus detection cycles, the reliability of the result of the focus detection and so on.

REFERENCES:
patent: 2782683 (1957-02-01), Walker
patent: 3972066 (1976-07-01), Tsujimoto et al.
patent: 4043642 (1977-08-01), Hirose et al.
patent: 4161756 (1979-07-01), Thomas
patent: 4705380 (1987-11-01), Yamamoto et al.
patent: 4735494 (1988-04-01), Makino et al.
patent: 4935763 (1990-06-01), Itoh et al.

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