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DIMPLED OPEN BOAT FOR SELENIUM-ARSENIC ALLOY EVAPORATION

IP.com Disclosure Number: IPCOM000024230D
Original Publication Date: 1980-Feb-29
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 66K

Publishing Venue

Xerox Disclosure Journal

Abstract

Xerographic photoreceptors commonly comprise a photoconductive layer of selenium-arsenic alloy on a suitable substrate drum or belt. The photoconductive layer is usually applied to the substrate in an evacuated chamber by vapor deposition of the alloy material retained in heated boat units. The boat units often used for evaporation of selenium-arsenic alloys are f lat-bottomed boats with sloping sides. One of the problems with this type of boat is that even a small tilt will allow the molten alloy to run to one end of the boat as the alloy is depleted. Such end puddling produces a different final arsenic concentration in the molten alloy, thus a different arsenic evaporation as the boat empties compared to that which would occur from a level boat. With the large number of boats frequently used in a production coater, there are many boats with varying degrees of tilt, thus giving varying end point arsenic contents in the selenium-arsenic alloy layers on the pho torecepto rs.

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XEROX DISCLOSURE JOURNAL

DIMPLED OPEN BOAT FOR SELENIUM- ARSENIC ALLOY EVAPORATION Lewis B. Leder

Proposed Classification
U.S. Cl. 96/1 Int. C1. G03g

Xerographic photoreceptors commonly comprise a photoconductive layer of selenium-arsenic alloy on a suitable substrate drum or belt. The photoconductive layer is usually applied to the substrate in an evacuated chamber by vapor deposition of the alloy material retained in heated boat units. The boat units often used for evaporation of selenium-arsenic alloys are f lat-bottomed boats with sloping sides. One of the problems with this type of boat is that even a small tilt will allow the molten alloy to run to one end of the boat as the alloy is depleted. Such end puddling produces a different final arsenic concentration in the molten alloy, thus a different arsenic evaporation as the boat empties compared to that which would occur from a level boat. With the large number of boats frequently used in a production coater, there are many boats with varying degrees of tilt, thus giving varying end point arsenic contents in the selenium-arsenic alloy layers on the pho torecepto rs.

The present concept contemplates a modified boat to overcome the aforementioned problem; the modified boat having basically the same construction as the standard boat except that the flat bottom has a multiplicity of dimples depressed into it to provide small reservoirs for the molten alloy as the alloy becomes depleted. The depressed dimples ret...