Camera with a zoom lens

Details Camera with a zoom lens Camera with a zoom lens

Filed on

1990-01-18

Date issued

1991-12-24

Examiner

Brown, Brian W.

Other Related Categories

354400, G03B 118

Type

Patent

Status

active

Patent number

050757091

Description

ABSTRACT:
A camera with a zoom lens for keeping in focus at a moving (proceeeding to or receding from the lens) object while the lens is zoomed and the magnification of the object is maintained constant. In the process, at every focal length of the zoom lens, the focusing lens group is shifted from a predetermined position (in an embodiment, it is the position of the focusing lens group where an object at infinity is focused on the film surface) by a distance C.multidot..beta., where C is a constant and .beta. is the maintained magnification. The constant C depends on the lens configuration; two examples are shown in the description of the embodiments.

REFERENCES:
patent: 3972056 (1976-07-01), Tsujimoto et al.
patent: 4043642 (1977-08-01), Hirose et al.
patent: 4474447 (1984-10-01), Kawabata et al.

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