Image magnification control device for a camera

Details Image magnification control device for a camera Image magnification control device for a camera

1989-09-22

1992-03-03

Hix, L. T.

35419512, G03B 1300

Patent

active

050936808

ABSTRACT:
An image magnification control device for a camera. Control focal length required to maintain an image magnification constant is computed based upon defocus information detected by analyzing a light that passes through a photographic lens. In case a focal length of the photographic lens moves out of a range wherein the set image magnification can be obtained, various options, such as a shutter-release lock operation, can be executed depending upon the chosen design of the camera.

REFERENCES:
patent: 4156933 (1979-05-01), Pandres, Jr.
patent: 4509842 (1985-04-01), Taniguchi et al.
patent: 4560267 (1985-12-01), Nakai et al.
patent: 4623238 (1986-11-01), Taniguchi et al.
patent: 4717933 (1988-01-01), Ando et al.
Page 67 of an Infinity Super Zoom 300 camera instruction manual, having a publication date of "0788" (indicating Jul., 1988).

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