Browse Prior Art Database

OPTICAL SENSOR CONTAMINATION SENSING

IP.com Disclosure Number: IPCOM000027611D
Original Publication Date: 1998-Apr-30
Included in the Prior Art Database: 2004-Apr-08
Document File: 2 page(s) / 78K

Publishing Venue

Xerox Disclosure Journal

Abstract

Paper path optical sensors in present copiers and printers become contaminated from paper dust and airborne particles. Today there is no known means employed in these XEROX DISCLOSURE JOURNAL - Vol. 23, NO. 2 MaKMApril1998 63

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XEROX DISCLOSURE JOURNAL

OPTICAL SENSOR CONTAMINATION Proposed Classification SENSING U. S. C1. 250/214 James S. Stoll
Robert J. Isernia
John M. Shura

Int. C1. HOlj 40/14

FIG. I P?

FIG. 2

Paper path optical sensors in present copiers and printers become contaminated from paper dust and airborne particles. Today there is no known means employed in these

XEROX DISCLOSURE JOURNAL - Vol. 23, NO. 2 MaKMApril1998 63

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OPTICAL SENSOR CONTAMINATION SENSING (CONT'D)

machines to sense the contamination or the reduction in illumination emitted by the sensors. Hence, an optical sensor that provides for the automatic detection of contamination and the degradation of output illumination therefrom is disclosed.

As shown in Figure 1, an optical sensor 10 for sensing contamination is housed in a horseshoe shaped casing 12 having an optical path 14 therein. The sensor 10 includes two opposed illumination receptors 16 and 20. Receptor 16 detects the presence of paper blocking the optical path 14, and receptor 20 detects illumination emitted from a light source 18 shown in Figure 2

Figure 2 is a cutaway view of the Figure 1 sensor showing a light source 18 for illuminating receptor 16 through a pair of transparent coverings 22. A deflector 24 surrounding receptor 16 reflects a portion of the light emitted by source 18 back to receptor 20. During a machine start up, machine logic performs a sensor self check by sensing...