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ILLUMINATION SYSTEM FOR A MULTI-MAGNIFICATION GRADIENT INDEX LENS ARRAY ASSEMBLY

IP.com Disclosure Number: IPCOM000025219D
Original Publication Date: 1984-Feb-29
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 107K

Publishing Venue

Xerox Disclosure Journal

Abstract

Gradient index lens arrays have found wide usage as imaging devices for compact devices by virtue of their relatively short conjugate requirements (60- illumination to be directed against a document scan strip on an overlying document platen with the light reflected along the linear entrance face of the lens array). These requirements are complicated when two or more lens arrays, each having a different magnification value, are formed as an integral imaging assembly. For this configuration, each array may require a separate level of illumination corresponding to the magnification value (e.g. a .6X reduction array may require a greater illumination level than an unity (1X) array.

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Page 1 of 2

XEROX DISCLOSURE JOURNAL

ILLUMINATION SYSTEM FOR A MULTI- MAGNIFICATION GRADIENT INDEX LENS ARRAY ASSEMBLY
Kenneth J. Mihalyov

Proposed Classification
U.S. C1. 355/8 Int. C1. G03g 15/28

II

          I APPROX. I I APPROX. I I APPROX. ENERGY I ENERGY

k--

-22 FIG. I

I\

DISTANCE FROM CENTERLINE OF IX LENS

FIG. 2

Volume 9 Number 1 January/Fkbruary 1984 49

.091 .08

L- .07{

-

z

2 .06-

W

U Z .05-

5

n Q .04- CL

z w

k

2.02-

.01-

.03-

I

ENERGY SEEN BY

I SEEN BY I I I.0X LENS I I SEEN BY I

1.414~ 0.707 X

I LENS I I I I LENS I

.oo

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ILLUMINATION SYSTEM FOR A MULTI-MAGNIFICATION GRADIENT INDEX LENS ARRAY ASSEMBLY (Cont'd)

Gradient index lens arrays have found wide usage as imaging devices for compact devices by virtue of their relatively short conjugate requirements (60-

illumination to be directed against a document scan strip on an overlying document platen with the light reflected along the linear entrance face of the lens array). These requirements are complicated when two or more lens arrays, each having a different magnification value, are formed as an integral imaging assembly. For this configuration, each array may require a separate level of illumination corresponding to the magnification value (e.g. a .6X reduction array may require a greater illumination level than an unity (1X) array.

Figure 1 shows an optical system 10 of a copier. A document 12, placed on movable platen 14, is moved through an exposure zone overlying a multi- magnification, gradient index lens assembly 16. Assembly 16 comprises a 1.4 14X lens 18, a 1.OX lens 20 and a 0.707X lens 22. Illumination assembly 30 comprises a linear lamp 32, an upper elliptical reflector 34 and a lower elliptical reflector 36. Reflectors 34 and 36 have specular reflecting surfaces and are designed so as to transfer energy from the lamp to the platen in a ratio determined by the focusing properties of...