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Flexible Belt of Dotted Brittle Photoconductor

IP.com Disclosure Number: IPCOM000060618D
Original Publication Date: 1986-Mar-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Tam, AC: AUTHOR

Abstract

For use in electrophotography, there is provided a flexible belt of dotted brittle photoconductor (i.e., photoconductive materials in small segments adhering onto a flexible belt). The photoconductor "dots" do not break or crack provided the width (b) the thickness (d) of a dot are small enough. The maximum longitudinal strain in the photoconductor dot is given by d/R in first approximation, and the maximum shear strain is given by b/2R in the first approximation where R is the radius of curvature of a curved belt. No breaking occurs where these strai are kept below 10-4 for photoconductive materials like silicon. In this case, for a roller radius of 10 cm, the photoconductive film thickness d should not exceed 10 microns, and the dot width b should not exceed 20 microns. Larger values are permitted for larger roller radius.

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Flexible Belt of Dotted Brittle Photoconductor

For use in electrophotography, there is provided a flexible belt of dotted brittle photoconductor (i.e., photoconductive materials in small segments adhering onto a flexible belt). The photoconductor "dots" do not break or crack provided the width (b) the thickness (d) of a dot are small enough. The maximum longitudinal strain in the photoconductor dot is given by d/R in first approximation, and the maximum shear strain is given by b/2R in the first approximation where R is the radius of curvature of a curved belt. No breaking occurs where these strai are kept below 10-4 for photoconductive materials like silicon. In this case, for a roller radius of 10 cm, the photoconductive film thickness d should not exceed 10 microns, and the dot width b should not exceed 20 microns. Larger values are permitted for larger roller radius. Practical electrophotographic drums of a-Si of 30 micron thickness have been produced commercially. This same thickness can be tolerated on rollers of 30 cm radius, where dot width of 60 microns can be permitted.

Two general classes of methods of preparing such a belt are possible, namely depositing dotted patterns on the flexible substrate or etching off a net of grooves from a continuous film on the flexible substrate. The former method can be done by chemical vapor deposition with the use of a gas like silane and a patterned energetic beam like a laser beam, an e-beam, or a metastable atomic b...