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COLOR COPY FILTER FOR INFRARED SENSITIVE PHOTORECEPTOR SYSTEMS

IP.com Disclosure Number: IPCOM000025016D
Original Publication Date: 1983-Apr-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 62K

Publishing Venue

Xerox Disclosure Journal

Abstract

In some automatic document reproducting applications, it is desired to use a light source which produces some radiation in an infrared range with a photoreceptor which is sensitive in the infrared region. A difficulty is presented in such a system when one wishes to copy colored, for example, blue and red ballpoint, since the inks typically used are reflective in the near infrared region. To overcome this limitation, it is proposed to provide a two position optical filter in the machine which would be controlled by a colored ink/colored document button on the control panel of the machine. In the normal mode of operation used to copy documents on white or colored bond paper, a neutral density filter is inserted between the lamp and the document which allows the photoreceptor to be exposed to the infrared portion of the lamp spectrum. This reduces the background potential for colored bond paper and assists in controling copy contrast. When used to copy documents containing colored images, the colored ink button is depressed and an infrared cutoff filter is inserted between the lamp and the document to limit the lamp spectrum seen by the photoreceptor to other than the infrared region to increase the contrast of the colored ink and improve copyability. The optical density of the neutral filter can be chosen to equalize the total photoreceptor discharge in background areas for the two copying modes.

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EROX DISCLOSURE JOURNAL

COLOR COPY FILTER FOR INFRARED SENSITIVE PHOTORECEPTOR SYSTEMS John F. O'Brien

Proposed Classification
U.S. Cl. 355/67 Int. CI. G03b 27/54

In some automatic document reproducting applications, it is desired to use a light source which produces some radiation in an infrared range with a photoreceptor which is sensitive in the infrared region. A difficulty is presented in such a system when one wishes to copy colored, for example, blue and red ballpoint, since the inks typically used are reflective in the near infrared region. To overcome this limitation, it is proposed to provide a two position optical filter in the machine which would be controlled by a colored ink/colored document button on the control panel of the machine. In the normal mode of operation used to copy documents on white or colored bond paper, a neutral density filter is inserted between the lamp and the document which allows the photoreceptor to be exposed to the infrared portion of the lamp spectrum. This reduces the background potential for colored bond paper and assists in controling copy contrast. When used to copy documents containing colored images, the colored ink button is depressed and an infrared cutoff filter is inserted between the lamp and the document to limit the lamp spectrum seen by the photoreceptor to other than the infrared region to increase the contrast of the colored ink and improve copyability. The optical density of the neutral filter can be chose...