Browse Prior Art Database

ILLUMINATION FOR FULL-WIDTH SCANNING ARRAYS

IP.com Disclosure Number: IPCOM000026877D
Original Publication Date: 1994-Feb-28
Included in the Prior Art Database: 2004-Apr-06
Document File: 2 page(s) / 60K

Publishing Venue

Xerox Disclosure Journal

Abstract

The present disclosure is directed toward the use of an electro-luminescent strip as an illumination source for a full-width array scanning system. As illustrated in the figure, an electro-luminescent strip 10 is used to illuminate an original 12 on a scanner platen 14. A Fresnel lens 16 is used to focus the light down to a small strip at the region to be scanned, 18, thereby increasing the intensity of the light. The output of electro-luminescent strip 10 may be increased by the standard method of employing an alternating current (AC) signal to drive the strip. A scanning full-width array 20 is used to receive the reflected light because it is inherently more sensitive to light than a monolithic sensor.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

XEROX DISCLOSURE JOURNAL

ILLUMINATION FOR FULL-WIDTH Proposed Classification SCANNING ARRAYS U.S. C1.358/475 John G. Powers
Int. Jack K. Fullerton C1. H04n 1/28

18 12

I+ , 1

-* /'

14

"-

10 1" 20

4

II

-

L SCAN DIRECTION

XEROX DISCLOSURE JOURNAL - Vol. 19, No. 1 JanuaryFebruary 1994 81

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

Page 2 of 2

ILLUMINATION FOR FULL- WIDTH SCANNING ARRAYS(Cont'd)

The present disclosure is directed toward the use of an electro-luminescent strip as an illumination source for a full-width array scanning system. As illustrated in the figure, an electro-luminescent strip 10 is used to illuminate an original 12 on a scanner platen 14. A Fresnel lens 16 is used to focus the light down to a small strip at the region to be scanned, 18, thereby increasing the intensity of the light. The output of electro-luminescent strip 10 may be increased by the standard method of employing an alternating current (AC) signal to drive the strip. A scanning full-width array 20 is used to receive the reflected light because it is inherently more sensitive to light than a monolithic sensor.

As another alternative, the electro-luminescent strip may be curved to form an integrating cavity within itself, thereby focussing the output and allowing it to be used with, or without, the Fresnel lens.

82 XEROX DISCLOSURE JOURNAL - Vol. 19, No. 1 Januarymebruary 1994

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