Cam grooves for displacing lenses

Details Cam grooves for displacing lenses Cam grooves for displacing lenses

1984-12-17

1986-12-09

Corbin, John K.

G02B 1500

Patent

active

046276912

ABSTRACT:
Cam grooves for displacing lenses of an optical system in which lenses or lens groups are displaced in parallel to an optical axis by a lens-operating ring mounted on a support barrel rotatable about the optical axis, but not shifted in parallel to the optical axis. The cam grooves are provided by obtaining the maximum lengths of displacement of vari-focal lenses, among the lengths of displacement of the one or more lenses or one more lens groups, in respective equal-difference minute ranges between respective changed focal lengths, over the entire range of a train of varying focal lengths or photographic distance; and by applying lead angles as slope of cam grooves to the respective maximum lengths of displacement of the lenses.

REFERENCES:
patent: 3655271 (1972-04-01), Suzuki
patent: 3992083 (1976-11-01), Tanaka
patent: 4148548 (1979-04-01), Thompson
patent: 4162822 (1979-07-01), Nonogaki

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