Radiant energy – Photocells; circuits and apparatus – With circuit for evaluating a web – strand – strip – or sheet
Patent
1997-10-21
1999-07-20
Allen, Stephone
Radiant energy
Photocells; circuits and apparatus
With circuit for evaluating a web, strand, strip, or sheet
250223R, 356446, G01N 2186
Patent
active
059258896
ABSTRACT:
A printer responds to a media gloss measurement for improved color printing. The printer includes a gloss meter, a controller, and a print engine. The gloss meter includes a solid body having a source tube and a reflection tube each being integral within the body. An LED in the source tube illuminates a reference surface at an angle of incidence. A photo sensor in the reflection tube responds to a first reference spectral reflection from the surface at an angle of reflection equal to the angle of incidence. When a sheet of media is registered by the printer against the reference surface, the photo sensor responds to a second spectral reflection from the media. The ratio of second to first spectral reflection intensities is compared to a selected threshold to identify the media by gloss level. When motion of the media is resumed, the media wipes the reference surface to maintain the accuracy of gloss measurements. The angle of incidence is less than thirty degrees for discriminating among media having low gloss characteristics.
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TAPPI Standard T480 om-92, "Specular Gloss of Paper and Paperboard at 75 Degrees", 1992, pp. 1-7.
Guillory Douglas M.
Lawton Robert J.
Lloyd Michael B.
Allen Stephone
Hewlett--Packard Company
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