Browse Prior Art Database

OPTICAL IMAGE BAR FOR USE IN XEROGRAPHY

IP.com Disclosure Number: IPCOM000025707D
Original Publication Date: 1987-Jun-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 87K

Publishing Venue

Xerox Disclosure Journal

Abstract

Optical image bars are arrays of light emitting pixels or arrays of pixel-sized shutters controlling the light output of a uniform source. A typical image bar is a page-wide single or double line array electrically addressed "line at a time". The arrays are used to imagewise expose a photosensitive medium such as a charged photoreceptor, which moves orthogonally to the image bar. Examples of image bars are liquid crystals (light controlling) and LED'S (light emitting).

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XEROX DISCLOSURE JOURNAL

OPTICAL IMAGE BAR FOR USE

IN XEROGRAPHY

Werner E. Haas

Proposed Classification

US. C1.355/1 Int. C1. G03b 27/00

24

I

2o 22

FIG. I

24

\

FIG. 2

Volume 12 Number 3 May/June 1987 141

[This page contains 1 picture or other non-text object]

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OPTICAL IMAGE BAR FOR USE IN XEROGRAPHY (Cont'd)

Optical image bars are arrays of light emitting pixels or arrays of pixel-sized shutters controlling the light output of a uniform source. A typical image bar is a page-wide single or double line array electrically addressed "line at a time". The arrays are used to imagewise expose a photosensitive medium such as a charged photoreceptor, which moves orthogonally to the image bar. Examples of image bars are liquid crystals (light controlling) and LED'S (light emitting).

One major problem occurring in image bars is lack of efficient "one to one" light coupling between the image bar and the photosensitive medium.

The most frequently used system is the so-called SELFOC lens, an array of gradient index lenses, which is effective, but suffers from shortcomings such as limited resolution, very critical depth field, non-uniformity and limited collection efficiency.

These problems have been overcome using a liquid crystal cell in which one of the lasses is a fiberoptic faceplate. Polarizers external to the glass plate and

to the photosensitive medium.

Experiments with cells such as shown in figure 1 comprising a polarizer 10, fiberoptic faceplate 12, conduc...