Photocopying – Projection printing and copying cameras – Focus or magnification control
Patent
1989-05-31
1991-03-05
Hix, L. T.
Photocopying
Projection printing and copying cameras
Focus or magnification control
355 58, G03B 2734
Patent
active
049981358
ABSTRACT:
A mechanism for curvedly moving a projection lens assembly accommodated in a lens barrel to alter projecting magnification of a projecting optical system is comprised of a support member for supporting a lens barrel accommodating a projection lens assembly, a movable member for holding thereon the support member so that the support member is movable in a first direction, the movable member being movable in a second direction, a guide member in the form of a plate fixedly mounted below the movable member for restricting the position of the support member in the first direction and for guiding the movable member in the second direction, and a drive unit for moving the movable member to an appropriate location corresponding to an altered projecting magnification. The drive unit includes a plurality of pulleys, an endless wire passed about these pulleys and a stepping motor coupled with one of the pulleys.
REFERENCES:
patent: 4557594 (1985-12-01), Negoro
patent: 4618253 (1986-10-01), Arai
patent: 4641957 (1987-02-01), Takeda et al.
patent: 4805001 (1989-02-01), Hayashi et al.
Hix L. T,.
Minolta Camera Kabushiki Kaisha
Rutledge D.
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