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Browse Prior Art Database

Multiple-Copy Printing Process

IP.com Disclosure Number: IPCOM000098910D
Original Publication Date: 1958-Dec-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Schaffert, RM: AUTHOR

Abstract

A xerographic plate comprising a conductive substrate 2 on which is super imposed a layer of amorphous selenium 3 is useful for printing multiple copies, when provided with a layer of phosphor 4. The phosphor layer is exposed to a photo-image to form a persistently luminescent image 5 and then sensitized in the conventional manner with electrostatic charge. The applied charge is dissipated in the luminescent areas and is retained in the nonluminescent areas of the plate.

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Multiple-Copy Printing Process

A xerographic plate comprising a conductive substrate 2 on which is super imposed a layer of amorphous selenium 3 is useful for printing multiple copies, when provided with a layer of phosphor 4. The phosphor layer is exposed to a photo-image to form a persistently luminescent image 5 and then sensitized in the conventional manner with electrostatic charge. The applied charge is dissipated in the luminescent areas and is retained in the nonluminescent areas of the plate.

Electrostatically charged toner particles 6 applied to the surface of the phosphor layer develop the charged areas. The developed image is transferred to a print medium 7 brought into contact with the phosphor layer surface. Additional copies are made by merely repeating the steps of sensitization and development (after the removal of the excess toner) during the period of luminescence. Erasure of the luminescent image is obtained by quenching the phosphor layer with infrared light. Alternatively, the plate could be sensitized prior to exposure to the photo-image.

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