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HIGH CURRENT COROTRON WITH PHOTORECEPTOR PROTECTION

IP.com Disclosure Number: IPCOM000022952D
Original Publication Date: 1976-May-31
Included in the Prior Art Database: 2004-Mar-27

Publishing Venue

Xerox Disclosure Journal

Abstract

In corona apparatus 1, particularly of the high current unshielded or open shield wire type, or where the shield 2 is spaced further than normal from the wire 3 and photo~ receptor plate 4, undesirable sparking from the wire 3 may be to the plate 4, rather than to the shield 2, causing plate damage, It is proposed to solve this problem by positioning a grounded metal surface closer to the corona wire 3 than the plate 4. This could be a separate metal rod or piece 5, an indention or dimple 6 in the corona shield, or an annular lip or protrusion 7 from the edge of the photoreceptor which is closer to the wire than the rest of the plate 4. Any or all of these create a pre~ ferential (shorter) spark discharge path to a grounded surface to protect the imaging surface area of the photo~ receptor. The grounded metal surface area should be small enough not to draw a substantial normal corona current from the wire,