Optically variable magnification mechanism

Details Optically variable magnification mechanism Optically variable magnification mechanism

1990-12-07

1991-12-10

Grimley, A. T.

Photocopying

Projection printing and copying cameras

Focus or magnification control

355235, 355243, G03B 2736, G03G 1504

Patent

active

050722557

ABSTRACT:
An optically variable magnification mechanism that comprises a motor which rotates in one direction. A rotary cam is arranged so as to be rotated in one direction by the motor and has cam surfaces assigned on a periphery thereof corresponding to a plurality of magnification steps. A cam drive unit is arranged for transmitting a rotary force from the motor to the cam. An optical system is movable between positions corresponding to the magnification steps. A transmission system is arranged for transmitting a rotary force of the cam to the optical system to change the positions of the optical system sequentially.

REFERENCES:
patent: 4007986 (1977-02-01), Komori et al.
patent: 4487497 (1984-12-01), Kimura et al.
patent: 4571064 (1986-02-01), Hayashi et al.
patent: 4582418 (1986-04-01), Kozuka et al.
patent: 4800414 (1989-01-01), Takeda
patent: 4854672 (1989-08-01), Daikoku
patent: 4956672 (1990-10-01), Shibazaki et al.

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