Browse Prior Art Database

DUAL HEATERS IN A THERMAL INK JET CHANNEL

IP.com Disclosure Number: IPCOM000026305D
Original Publication Date: 1991-Apr-30
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 86K

Publishing Venue

Xerox Disclosure Journal

Abstract

A tandem dual heater arrangement in thermal ink jet (TIJ) print head channels is disclosed. Conventional TIJ technology utilizes a single heater for bubble generation which gives rise to proper lead drop formation but also creates trailing or satellite droplets. Minimization or elimination of the satellite droplets may be achieved by including a second heater element into the TIJ channel as shown in the sequence of Figures. A first heater element 1 generates a nucleate bubble 3 that begins an ink drop formation and ejection process, Figure 2. A second heater 2 in tandem with the first heater is next activated Figure 3, to generate a second bubble 4 to sever a trailing tail and further accelerate the ink droplet 5, Figure 4. Capillary action of the ink in the channel returns the system to the ready state, Figure 1. Thus, the second heater 2 acts as a knife to trim off satellite drops and reduce front face-6 contamination of the TIJ element.

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Page 1 of 2

XEROX DISCLOSURE JOURNAL

DUAL HEATERS IN A THERMAL

INK JET CHANNEL U.S. C1.3461075 Zhao-Zhi Yu

Proposed Classification

Int. C1. Gold 15i18

.

FIG. I

FIG. 2

FIG. 3

FIG. 4

1

_I)

3

-

5

XEROX DISCLOSURE JOURNAL - VoI. 16, No. 2 MarchIApril1991 91

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Page 2 of 2

DUAL HEATERS IN A THERMAL INK JET CHANNEL(Cont'd)

A tandem dual heater arrangement in thermal ink jet (TIJ) print head channels is disclosed. Conventional TIJ technology utilizes a single heater for bubble generation which gives rise to proper lead drop formation but also creates trailing or satellite droplets. Minimization or elimination of the satellite droplets may be achieved by including a second heater element into the TIJ channel as shown in the sequence of Figures. A first heater element 1 generates a nucleate bubble 3 that begins an ink drop formation and ejection process, Figure 2. A second heater 2 in tandem with the first heater is next activated Figure 3, to generate a second bubble 4 to sever a trailing tail and further accelerate the ink droplet 5, Figure 4. Capillary action of the ink in the channel returns the system to the ready state, Figure 1. Thus, the second heater 2 acts as a knife to trim off satellite drops and reduce front face-6 contamination of the TIJ element.

92 XEROX DISCLOSURE JOURNAL - Vol. 16, No. 2 MarcldApril1991

[This page contains 1 picture or other non-text object]