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Edge Lighted Photoconductor and Array

IP.com Disclosure Number: IPCOM000095510D
Original Publication Date: 1964-Feb-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Davis, BW: AUTHOR [+3]

Abstract

Photoconductor 10 has photoconductive material 1 1 and conductors 12 and 13 coated on one face of a glass sheet 14. Photoconductor 10 is to be illuminated from the edge rather than from a flat face of it.

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Edge Lighted Photoconductor and Array

Photoconductor 10 has photoconductive material 1 1 and conductors 12 and 13 coated on one face of a glass sheet 14. Photoconductor 10 is to be illuminated from the edge rather than from a flat face of it.

A number of such photoconductors are arranged in a stacked assembly 15. In this manner, glass sheets 14 are used for three purposes, namely: as a substrate for the photoconductive material, as a light pipe to direct light appearing at an edge of the glass sheet onto the photoconductive material, and as an insulator between the photoconductor layers. Thus, stacked assembly 15 can be utilized to scan a document appearing at one corner 16 in which illumination of a photoconductor allows passage of current through it to simultaneously electrostatically print, at print wires 17, a copy of the document being scanned.

If desired, a layer of light-reflective material can be coated on the opposite face of glass sheet 14 from photoconductive material 11. This prevents light conducted by the glass sheet from impinging on the photoconductive layer of an adjacent photoconductor.

Photoconductor 10 has the following advantages. Each photoconductor scans a small area of the document without requiring magnification of the document. The photoconductor has a large surface area. Such provides spacing between electrodes 12 and 13 which permit high voltages across the photoconductive material 11. Such also allows less precision in manufacture of ...