Method of controlling a zoom lens assembly

Details Method of controlling a zoom lens assembly Method of controlling a zoom lens assembly

1992-05-19

1993-08-03

Ben, Loha

Optical: systems and elements

Lens

With variable magnification

359900, 354400, 358225, G02B 1514

Patent

active

052334724

ABSTRACT:
A method of controlling the focusing of a zoom lens which has a plurality of lens groups including at least one focusing lens group, wherein an amount of deviation from focus caused by a zooming operation is corrected by movement of the focusing lens group. The method includes setting a reference object distance, at which no deviation from focus occurs during zooming of the zoom lens, at a finite object distance, such that the amount of movement of the focusing lens group necessary to effect focusing is determined based upon a reference position corresponding to a position of the focusing lens group at the reference object distance, in accordance with focal length data and object distance data.

REFERENCES:
patent: 4161756 (1979-07-01), Thomas
patent: 4621906 (1986-11-01), Hashimoto et al.
patent: 4627691 (1986-12-01), Tomori
patent: 4696559 (1987-09-01), Kondo
patent: 4697891 (1987-10-01), Kawai
patent: 4786153 (1988-11-01), Ogata
patent: 4822153 (1989-04-01), Tomori et al.
patent: 4842385 (1989-06-01), Tanaka
patent: 4890133 (1989-12-01), Ogawa et al.
patent: 4950054 (1990-08-01), Wada et al.
patent: 4978204 (1990-12-01), Ito
patent: 5065172 (1990-11-01), Ogawa et al.
patent: 5066968 (1991-11-01), Suzuki et al.
D. Hacman. Jahrbuch fur Optik und Fienmechanik. Pegasus Verlag Wetzlar. (1972) pp. 36-37.
English Abstract of Japanese Patent No. 60-6914--Jan. 1985.
English Abstract of Japanese Patent No. 62-237416--Oct. 1987.
English Abstract of Japanese Patent No. 62-244026--Oct. 1987.
English Abstract of Japanese Patent No. 63-239430--Oct. 1988.

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