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Color Balanced Ink Jet System

IP.com Disclosure Number: IPCOM000084187D
Original Publication Date: 1975-Oct-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Osbourne, ET: AUTHOR [+2]

Abstract

A triad grouping of nozzles is utilized in this color ink jet system. Each nozzle in the triad is provided with a supply of a different color ink, such as red, yellow and blue. Selective issuance of ink from one or more nozzles in the triad provides the capability of producing a full spectrum of colors.

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Color Balanced Ink Jet System

A triad grouping of nozzles is utilized in this color ink jet system. Each nozzle in the triad is provided with a supply of a different color ink, such as red, yellow and blue. Selective issuance of ink from one or more nozzles in the triad provides the capability of producing a full spectrum of colors.

It is also desirable for the triad to have the capability of producing black, without the use of a fourth nozzle. This is achieved by controlling the amount of ink normally issuing from each nozzle in such a manner, that the total ink supply from all three nozzles combines to achieve black.

One manner of achieving such control is to adjust the size of the nozzles to correspond to the amount of each ink required to produce black. For example, black may be achieved from a mixture of inks including 47% yellow, 32% magenta and 21% CYAN*.

Accordingly, to achieve a good black, the size of the nozzles should be proportional to the amount of ink required to supply the above percentages. For example then, in such a color system the diameters of the nozzles would be 1.4 mil for yellow, 0.95 mil for magenta, and 0.63 mil for CYAN. Of course, other sizes can be used so long as the proportions remain the same. Similarly, the choice of nozzle sizes for other color systems is now a matter of simple calculation. * Trademark of American Cyanamid Company

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