Optical device

Details Optical device Optical device

1991-10-16

1994-03-01

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Focus or magnification control

359697, 355 58, G03B 2752

Patent

active

052912418

ABSTRACT:
In an imaging apparatus, a magnified image of an object is formed on a predetermined plane through a plurality of lens groups. A plurality of filters are selectively inserted into the light path between the object and the predetermined plane. An optical device is provided in the imaging apparatus, in which the plurality of lens groups are driven as a unit along the optical axis while the positional relation among the respective lens groups are correspondingly changed, wherein at least one of the plurality of lens groups is independently driven along the optical axis. The plurality of lens groups are driven to move in accordance with a desired image magnification, and at-least-one of the plurality of lens groups is independently driven, depending upon the selected filter, so as to place the object image on the predetermined plane.

REFERENCES:
patent: 4322159 (1982-03-01), Takahashi et al.
patent: 4420248 (1983-12-01), Ogawa et al.
patent: 4557594 (1985-12-01), Negoro
patent: 4825252 (1989-04-01), Suzuki et al.
patent: 4881799 (1989-11-01), Ohno et al.
patent: 4974948 (1990-12-01), Arai et al.

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