Back focus controlling device in optical systems

Details Back focus controlling device in optical systems Back focus controlling device in optical systems

1982-03-29

1984-07-03

Hayes, Monroe H.

Photocopying

Projection printing and copying cameras

Focus or magnification control

355 55, 355 57, G03B 2770

Patent

active

044576196

ABSTRACT:
A lens focus controlling device for an optical system includes a first cylindrical cam having a cam face formed on at least one end thereof, a second cylindrical cam having a cam face on one end thereof slidably disposed in contact with said first cam face over a predetermined range, a lens group secured to said second cylindrical cam, a stop member operatively engageable with said lens group to prevent rotation while allowing reciprocation of said lens group along the optical axis thereof and a drive system for rotating said first cylindrical cam relative to said second cylindrical cam.

REFERENCES:
patent: 975672 (1910-11-01), Bausch
patent: 2526433 (1950-10-01), Svensson
patent: 3220308 (1965-11-01), Lareau
patent: 3696725 (1972-10-01), Lange

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