Browse Prior Art Database

DIVOT NOZZLES

IP.com Disclosure Number: IPCOM000026883D
Original Publication Date: 1994-Feb-28
Included in the Prior Art Database: 2004-Apr-06
Document File: 2 page(s) / 94K

Publishing Venue

Xerox Disclosure Journal

Abstract

Referring to the Figure IA, which is a front view of a printhead die, it has been observed that the drop directionality of the triangular nozzles 12 currently used in thermal ink jet print heads can be influenced by the location, on the nozzle surface, of the ink ligament of the ejecting drop. Often the ligament is attached to one of the corners of the triangular nozzle 12 and the drop is then steered in the direction of that corner. However, since two of the corners 14 and 16 of the nozzle are geometrically equivalent, it is not uncommon for the ligament to 'jump' corners, i.e., to switch to the other corner in which case the drop will be steered in the other direction. Drop ligament break-off can be a metastable situation, occurring from one of three corners in the triangular-shaped nozzle.

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XEROX DISCLOSURE JOURNAL

DIVOT NOZZLES

Donald J. Drake Almon P. Fisher Reinhold E. Drews

Proposed Classification US. C1.437/235
Int. C1. HOll21/02

12

FIG. IA

FIG. 2A

14 -

f

20

-

Pit

&

Heater Area

I 16

- 22

Pit

&

Heater Area

Pit

&

Heater Area

\ 20

n 22

FIG. I5

FIG. 25

FIG. 3A

f

20

FIG. 4A

-

Pit

&

Heater Area

\ 20

& FIG. 46

L22)

XEROX DISCLOSURE JOURNAL - Vol. 19, No. 1 Januarymebruary 1994 93

FIG. 35

L

c 22

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

Page 2 of 2

DIVOT NOZZLES(Cont'd)

Referring to the Figure IA, which is a front view of a printhead die, it has been observed that the drop directionality of the triangular nozzles 12 currently used in thermal ink jet print heads can be influenced by the location, on the nozzle surface, of the ink ligament of the ejecting drop. Often the ligament is attached to one of the corners of the triangular nozzle 12 and the drop is then steered in the direction of that corner. However, since two of the corners 14
and 16 of the nozzle are geometrically equivalent, it is not uncommon for the ligament to 'jump' corners, i.e., to switch to the other corner in which case the drop will be steered in the other direction. Drop ligament break-off can be a metastable situation, occurring from one of three corners in the triangular- shaped nozzle.

Two possible solutions for this metastable condition are disclosed. The first is to make the nozzle face as homogeneous as possible so that the ligament will have no favored position...