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Multi-Colored Ink Jet Printing with Leucodyes

IP.com Disclosure Number: IPCOM000045055D
Original Publication Date: 1983-Jan-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 3 page(s) / 61K

Publishing Venue

IBM

Related People

Bernier, WE: AUTHOR [+4]

Abstract

The described device effects printing by ejecting single droplets of dye from nozzles by piezoelectric means. The nozzles can be arranged in a dense array from which droplets are ejected, forming images (single- or multi-colored), as the printhead transverses the paper (serial printer) or the paper moves past the printhead (line printer/facsimile printer)- The essential features of this device are illustrated in Fig.1 and can be outlined as follows: The orifice nozzle consists of the following elements (Fig. 1): 1. dye cavity; 2. anode laminate; 3. cathode laminate; 4. piezoelectric transducer; 5. potting or casting compound; 6. orifice plate; and 7. dye supply channel from dye reservoir.

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Multi-Colored Ink Jet Printing with Leucodyes

The described device effects printing by ejecting single droplets of dye from nozzles by piezoelectric means. The nozzles can be arranged in a dense array from which droplets are ejected, forming images (single- or multi-colored), as the printhead transverses the paper (serial printer) or the paper moves past the printhead (line printer/facsimile printer)- The essential features of this device are illustrated in Fig.1 and can be outlined as follows: The orifice nozzle consists of the following elements (Fig. 1):

1. dye cavity;

2. anode laminate;

3. cathode laminate;

4. piezoelectric transducer;

5. potting or casting compound;

6. orifice plate; and

7. dye supply channel from dye reservoir.

This device is similar in design to the ink jet printing technology drop on demand print nozzle. However, the addition of the anode and cathode laminate to the basic ink jet print nozzle design is a distinguishing feature.

Fig. 1 shows two possible configurations of an electrochemical drop on demand actuator for which the following functional examples explain the transformation of the leucodye to a colored dye, which is then ejected from the actuator in the form of a droplet.

Functional Examples:
1. In Fig. 1a, anode 2 and cathode 3 control the color

formation. As the actuator

is called to print, a voltage is applied across anode

2 and cathode 3. The magnitude of the voltage determines the

color. Simultaneously, piezoelectric transducer 4 is

addressed, resulting in an increase in pressure in dye

cavity 1. As the leucodye mixture, which has been held

in dye cavity 1, passes through anode and cathode laminates

2 and 3, respectively, it is transformed into a colored dye.

As shown in Fig. 1a, anode laminate 2 is also used as

the orifice nozzle, thus controlling the diameter of the

ejected droplet. When a dot of a different color is

desired, a new voltage, corresponding to the desired color,

is applied across the anode and cathode and the droplet

ejection process is repeated.
2. Fig. 1b shows a second design for the location

of the color control

laminates (anode and cathode) for the actuator. In this

design the laminates are located in dye cavity 1. It should

be noted that, in Fig. 1b, orifice plate 6 controls the

formation of the droplet, whereas, in Fig. 1a, anode 2

serves as the orifice. For the design in Fig. 1b, the

mechanism for ejecting the droplet is the same as the

1

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mechanism described f...