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ILLUMINATION AND IMAGING SYSTEM FOR A LIGHT GATE ARRAY

IP.com Disclosure Number: IPCOM000025317D
Original Publication Date: 1984-Aug-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 72K

Publishing Venue

Xerox Disclosure Journal

Abstract

In the accompanying drawing, a light gate array 12 is illuminated by an aDerture fluorescent lamp 14. The lamp emits most of its actinic radiation through a relatively narrow aperture 20, where & is typically around 5 to 10 degrees about the light beam direction shown by arrow heads 18; the aperture is always less than 20 degrees. Efficient coupling of the light takes place by having the lamp 14 in very close proximity to the light gate array 12, which may be a linear system, a quasi-linear system, or a staggered array of gates.

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XEROX DISCLOSURE JOURNAL

ILLUMINATION AND IMAGING SYSTEM FOR A LIGHT GATE ARRAY
Jerome E. May
Howard M. Stark

ProDosed Classification US. CI. 355/65
Int. Cl. G03b 27/70

k-L-4

In the accompanying drawing, a light gate array 12 is illuminated by an aDerture fluorescent lamp 14. The lamp emits most of its actinic radiation through a relatively narrow aperture 20, where & is typically around 5 to 10 degrees about the light beam direction shown by arrow heads 18; the aperture is always less than 20 degrees. Efficient coupling of the light takes place by having the lamp 14 in very close proximity to the light gate array 12, which may be a linear system, a quasi-linear system, or a staggered array of gates.

The radiation or light is either blocked or transmitted by the light gate array in response to signals provided by external circuitry (not shown). The resultine; pattern of light is imaged by a linear lens system 22, usually at unit magnification, though not necessary at unity, onto a moving photodetector or photoconductive member 24 at the image plane 16. The lens system may be graded index fibers, SELFLOC, strip lens array, or the like. The configuration depicted in the drawing utilizes the fact that the radiance (i.e., energy Der unit area) of an aperture fluorescent lamp 14 increases as the aperture angle OC decreases. The increased brightness of the source is shown to be sufficient, if after accountinp for transmission losses in both the linear light gate array...