Patent ID: 6322192
Filing Date: 2001-11-27
Classification: B41J,H05B,Y02B

Abstract:
A multi-function optical sensing system for sensing ink droplets printed on media by an inkjet printing mechanism and for sensing indicia printed on media indicative of the media type, comprising:a first illuminating element positionable to illuminate selected portions of the media, wherein the first illuminating element emits light at a first wavelength;a second illuminating element positionable to illuminate selected portions of the media, wherein the second illuminating element emits light at a second wavelength;a photodetecting element directed to receive light reflected from the illuminated selected portions of the media, wherein the photodetecting element generates a signal in response to the light received;a first optical element which defines for the photodetecting element a first geometric pattern of light reflected from the media when illuminated by the first illuminating element, wherein the first optical element comprises an optical filter having a first filter element and a second filter element; anda second optical element which defines for the photodetecting element a second geometric pattern of light reflected from the media when illuminated by the second illuminating element;wherein the indicia reflects light of a third wavelength when illuminated by the second illuminating element;wherein the first filter element allows light of the first and third wavelengths to pass therethrough and blocks passage of light of the second wavelength;wherein the second filter element allows light of the third wavelength to pass therethrough and blocks passage of light of the first and second wavelengths.