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Ink Jet Color Copier and Universal Printer

IP.com Disclosure Number: IPCOM000079303D
Original Publication Date: 1973-Jun-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 60K

Publishing Venue

IBM

Related People

Pearson, RC: AUTHOR [+3]

Abstract

Reproduction of documents, pictures is accomplished by integrating the technologies of ink jet printing, color lithography and color TV camera scanning techniques. Color pictures are made by blending a closely spaced matrix of different color ink dots, in much the same way as a color lithograph print is made. Multicolor ink jets substitute for halftone screens by printing on the paper in predetermined locations, discrete ink dots.

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Ink Jet Color Copier and Universal Printer

Reproduction of documents, pictures is accomplished by integrating the technologies of ink jet printing, color lithography and color TV camera scanning techniques. Color pictures are made by blending a closely spaced matrix of different color ink dots, in much the same way as a color lithograph print is made. Multicolor ink jets substitute for halftone screens by printing on the paper in predetermined locations, discrete ink dots.

As shown generally in Fig. 1, the input may come from scanning an original document 10 in a parallel mode by four vidicon tubes 12a-d, (one for each of the basic colors red, blue, yellow, and black) in conjunction with lenses 14a-d representing the optical system, and color filters 16a-d. Scanning of the original is controlled by a horizontal and vertical deflection system 18, and the outputs are digitized in threshold digitizer and processing means 20, the signals of which are used to control ink jet nozzles 22a-d through shift registers 24a-d for printing on a document 26.

Referring to Fig. 2, further details of the controls are shown with the outputs of the vidicon tubes 12a-d being applied through analog-to-digital converter circuits 20a, through AND circuits 30a-d which are gated by Read Scan Controls 32 in conjunction with a drop and row counter 34, under the control of an operator panel 36 which determines start, stop and number of copies.

The nozzles 22a-d are controlled by digital-to-a...