Electrophotographic copying apparatus and process
AssigneeMinnesota Mining and Manufacturing Company
InventorsJames F. Sobieski, Robert A. Muehlhausen
Life of this patent
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Abstract
An electrophotographic copying apparatus includes a copying cycle which always alternates development between two image areas to equalize wear along the length of its photosensitive belt and which eliminates a cleaning cycle after the final copy of a copying cycle to reduce belt revolutions. Also included is a combined charger/precleaner to reduce size and a light image mask to prevent unnecessary toning of the belt.
Claims3
An electrophotographic copying apparatus including a photosensitive element, an object document, means for providing a light image of said object document, means for conveying said light image to said photosensitive element and means for transferring said light image from said photosensitive element to a receptor sheet, comprising:
- light mask means interposed between said object document and said photosensitive element for preventing a portion of said light image from reaching said photosensitive element so that less than all of said light image of said object document is transferred to said receptor sheet.
Dependencies are inferred from the claim text.