Cam mechanism for lens barrel

Details Cam mechanism for lens barrel Cam mechanism for lens barrel

1992-05-19

1999-02-02

Gray, David M.

Photography

With exposure objective focusing means, focusing aid, or...

Mechanical mechanism for displacement of exposure objective

396439, 359700, G03B 1300

Patent

active

058677402

ABSTRACT:
The present invention relates to a cam mechanism for a lens barrel wherein the mechanism is provided with a cam ring and a movable annular member. The cam ring is typically provided with a plural number of cam grooves formed in a predetermined cam profile in the same shape, in the same positions, and in the circumferential direction, but in respective positions differentiated in the optical axis direction. The movable annular member is set in engagement with the cam ring and has a plural number of cam pins installed thereon. The cam pins are fitted into the cam grooves of the cam ring so as to permit the movable annular member to, move freely in the optical axial direction, without being liable to any slanting thereof, in its rotation centering around the optical axis.

REFERENCES:
patent: 3628439 (1971-12-01), Furusawa
patent: 3787108 (1974-01-01), Ito et al.
patent: 3819254 (1974-06-01), Hummel et al.
patent: 4294526 (1981-10-01), Nakagawa
patent: 4515438 (1985-05-01), Ohnuki
patent: 4627691 (1986-12-01), Tomori
patent: 4709311 (1987-11-01), Bornhorst
patent: 4974949 (1990-12-01), Tanaka
patent: 5043752 (1991-08-01), Kohmoto

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