Identification of recording medium in a printer
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United States of America Patent
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Sep 18, 2001
Grant Date -
N/A
app pub date -
Mar 5, 1999
filing date -
Mar 5, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
The present invention is a method and device for identifying recording media in a printer. The invention utilizes fine structure of the media revealed by illumination from one or more directions to distinguish among different kinds of plain papers, coated papers, such as glossy papers, and transparency films. When the medium is bond paper, by introducing light at an angle of less than approximately sixteen degrees relative to the surface, raised surface irregularities cast shadows creating a pattern rich in detail. For glossy surfaces, a high contrast image is obtained in the specular direction from normally incident illumination. The medium surface is imaged on an optoelectronic sensor to form a characteristic vector which is compared with reference vectors, corresponding to different media types, to determine the recording medium. The detection of the recording medium may then be used to change the characteristics of the printer.
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