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US 4,792,826 AGranted
Optical device for copying machine with inversion of principal point of optical system
AssigneeFuji Photo Optical Co., Ltd.
InventorTakashi Suzuki
Life of this patent
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Abstract
In a mirror scan type copying machine in which a light source and part of mirrors are movable, the optical system employs an asymmetrical lens construction for image formation. The optical system is mounted on an inverting drive mechansim for switching the optical system from a position where its principal point is located on the side of the original mount into a position where its principal point is located on the side of the sensitive material surface or vice versa.
Claims5
An optical device for copying machines with copy enlarging and reducing, comprising in combination:
- a movable light source for illuminating a document on an original mount;
- a plural number of mirrors for leading reflected light from said document to a predetermined light path, part of said mirrors being movable along said light path;
- an optical system having an asymmetrical lens construction located in a midway position along said light path;
- a sensitive material surface for forming an image of said document thereon for exposure through said optical system;
- and
- an inverting drive means for switching said optical system from a position where said optical system has a principal point on the side of said original mount at a time of at least maximum copy enlarging to a position where said optical system has said principal point on the side of said sensitive material at a time of at least minimum copy reducing.
3 more elements
Dependencies are inferred from the claim text.