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Light Collimation Grid for Dichroic Copier Photoconductor

IP.com Disclosure Number: IPCOM000075405D
Original Publication Date: 1971-Sep-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Caudill, AH: AUTHOR

Abstract

A light-collimation grid for a dichroic copier photoconductor incorporates reflective and nonreflective surfaces to insure maximum lamp efficiency, while maintaining adequate contrast voltage on the photoconductor.

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Light Collimation Grid for Dichroic Copier Photoconductor

A light-collimation grid for a dichroic copier photoconductor incorporates reflective and nonreflective surfaces to insure maximum lamp efficiency, while maintaining adequate contrast voltage on the photoconductor.

The light-collimation grid consists of an "egg crate" like grid 11 disposed intermediate a fluorescent light source 13 and light-polarizer plane 15. The polarization direction of light-polarizer plane 15 is in the direction of arrow 17. Light passing through polarizer plane 15 passes through reflex dichroic photoconductor 19 onto document 21.

Light which emits from a source in a direction perpendicular to the polarizer plane 15 increases the contrast voltage on photoconductor 19. Members 23 of grid 11 are coated with nonreflective material to prevent light from reflecting therefrom in a nonperpendicular direction to polarizer plane 15. Grid members 25 are coated with a reflective surface to allow light rays to be reflected therefrom onto the polarizer plane 15. The reflected noncollimated light is not critical, since the light rays approach the document 21 perpendicular to the direction of polarization of polarizer plane 15. The utilization of reflective and nonreflective surfaces achieves high-light efficiency and high-contrast voltage on the photoconductor.

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