Autofocus system for cameras

Details Autofocus system for cameras Autofocus system for cameras

1990-06-11

1992-06-09

Hix, L. T.

Bearings

Rotary bearing

Plain bearing

358227, G03B 1300

Patent

active

051211521

ABSTRACT:
The present invention relates to an autofocus system for cameras with a separator (4) to split the object (2) in an autofocus measuring field (3) viewed through the camera lens (1) into two beams to determine the distance of the object (2) from the film plane (30). A control system which sets the focus of the camera lens (1) in accordance with the measured distance by means of servomotors or similar is provided to control the focusing of the camera lens (1). The invention provides for the autofocus measuring field (3) to be displaced such that it occupies any desired location within the frame (14).

REFERENCES:
patent: 4075640 (1978-02-01), Ueda et al.
patent: 4341451 (1982-07-01), Krueger et al.
patent: 4475800 (1984-10-01), Kinoshita et al.
patent: 4483602 (1984-11-01), Aoki et al.
patent: 4573784 (1986-03-01), Suzuki
patent: 4614975 (1986-07-01), Kaite
patent: 4835562 (1989-05-01), Norita et al.
patent: 4872058 (1989-10-01), Baba et al.
Japanese Publication B2-55-39809, dated Oct. 14, 1980.
Japanese Publication 50-129221, dated Oct. 13, 1975.
Japanese Publication 52-40133, Mar. 28, 1977.
Japanese Publication A-61-249034, dated Nov. 6, 1986.
Japanese Publication Y2-54-19870, dated Jul. 20, 1979.
Japanese Publication A-57-161708, dated Oct. 5, 1982.
Japanese Publication A-59-107685, dated Jun. 21, 1984.
"Yashica 230-AF Auto-Focus SLR", Modern Photography, pp. 46-53, Apr. 1987.
"Yashica 230-AF", Popular Photography, Jun. 1987.

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