Automatic focusing device

Details Automatic focusing device Automatic focusing device

1986-09-19

1987-11-10

Adams, Russell E.

Optics: motion pictures

Removable film strip magazine type

352140, G03B 310

Patent

active

047053801

ABSTRACT:
In the disclosed automatic focusing device for a zoom lens the in-focus position for a particular object distance varies with changes in the focal length. The device detects the amount of variation of the focal length of the zoom lens, and continuously drives the focusing lens.

REFERENCES:
patent: 3972056 (1976-07-01), Tsujimoto et al.
patent: 4157217 (1979-06-01), Isono
patent: 4161756 (1979-07-01), Thomas
patent: 4238143 (1980-12-01), Shenk
patent: 4290679 (1981-09-01), Vockenhuber
patent: 4389106 (1983-06-01), Maruyama
patent: 4477167 (1984-10-01), Ishikawa et al.
patent: 4550994 (1985-11-01), Maruyama
patent: 4561746 (1985-12-01), Matsuda et al.

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