Varifocal camera

Details Varifocal camera Varifocal camera

1991-03-06

1994-04-12

Rutledge, D.

G03B 118

Patent

active

053029917

ABSTRACT:
The invention provides a camera having a varifocal lens system including first, second, third and fourth lens groups positioned in that order along an optical axis from a subject side. The first and third lens groups are integrally held in a first holding barrel and the fourth lens group is held in a second holding barrel. The second lens group is disposed in the first holding barrel and positioned between the first and third lens groups. The focal length changing device provides the first holding barrel, and the second holding barrel respectively with different movements in the optical axis direction during changing of the focal length.

REFERENCES:
patent: 4816859 (1989-03-01), Maruyama et al.
patent: 4945371 (1990-07-01), Hashimoto et al.
patent: 5075709 (1991-12-01), Ueyama

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