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US 4,046,467 AGranted
Zoom lens copier
AssigneeXerox Corporation
InventorsKenneth W. Laskowski, Edward L. Steiner
Life of this patent
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AssigneeXerox Corporation
InventorsKenneth W. Laskowski, Edward L. Steiner
Estimating the term…
An imaging lens system for electrostatic type reproduction machine or copiers utilizing a zoom lens effective to provide, within the magnification limits of the lens, infinitely variable image sizes. A control is provided to pre-set the lens to automatically give, upon actuation, at least one preselected image size, with an override control to enable the lens to be set to provide any image size regardless of pre-set conditions. Further controls are provided for the machine non-image erase mechanism to automatically compensate for changes in the image borders brought about by changes in image size due to resetting of the zoom lens. For this purpose, an infinitely variable edge fadeout apparatus is provided incorporating movable shutters to vary the effective size of the edge erasure slots in correspondence with image size together with timing controls for changing the operational timing of the pitch fadeout lamp in response to changes in image size upon resetting of the zoom lens. Further controls enable the critical positioning of the image produced by the zoom lens on the photosensitive member to be adjusted to assure that the image, whatever the size, is optimally positioned on the copy produced with other controls to enable the image, whatever the size produced by the zoom lens, to be physically moved or offset on the copy.
In an electrostatic reproduction apparatus having a movable photosensitive member on which latent electrostatic images of originals being reproduced are formed;
In an electrostatic reproduction apparatus having a movable photosensitive member on which latent electrostatic images of originals being reproduced are formed together with means to charge the member in preparation for imaging;
A controller for an infinitely variable lens of an electrostatic type reproduction machine adapted to provide at least one preselected lens position whereat the lens projects an image of predetermined size, and drive means for moving the lens to change the size image projected, the combination of:
In an electrostatic reproduction machine having a movable charged photosensitive member on which latent electrostatic images of originals are formed, said machine having a movable lens assembly for providing images of variable sizes, and means for sensing the position of said lens assembly, the improvement comprising apparatus for discharging areas of said photosensitive member outside the perimeter of the latent electrostatic images, said apparatus including side edge erasure slots extending in a direction substantially perpendicular to the direction of movement of said photosensitive member, means to illuminate said photosensitive member through said slots thereby erasing the charge on the areas of said member opposite thereto, movable shutter means for varying the effective size of said slots to change the size of the areas of said member to be erased, means for sensing the position of said shutter means, comparison means for comparing the outputs of said shutter position and lens position sensing means, and means coupled to said comparison means for moving said shutter means in accordance with the output of said comparison means thereby matching the size of said erasure slots with the size of the image being produced.
Dependencies are inferred from the claim text.