Browse Prior Art Database

SILICON ETCHED RESERVOIR FOR BUBBLE CONTROL

IP.com Disclosure Number: IPCOM000027681D
Original Publication Date: 1998-Oct-31
Included in the Prior Art Database: 2004-Apr-08
Document File: 4 page(s) / 92K

Publishing Venue

Xerox Disclosure Journal

Abstract

The generation of bubbles in the silicon etched reservoir of thermal ink jet devices is known to be a significant source of print quality defects. A new design, shown in FIG. 1, includes a silicon channel plate 10 bonded to a heater plate 12 having heater resistors 14 located in a pit formed in a polyimide layer 16. Ink is introduced into reservoir 18 through inlet 20. When resistor 14 is heated, ink is ejected from nozzles 22. Note that the reservoir 20 cross section converges to a minimum cross section moving from bottom heater plate 12 to top ink inlet 20. This narrowing at the inlet has been shown to trap bubbles which form and grow at the heater plate surface. These bubbles have been correlated with print quality defects such as missing jets. This problem seems to be particularly troublesome for a new generation of ink jet printheads, since their higher resolution and area coverage performance requirements result in higher operating temperatures.

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Page 1 of 4

XEROX DISCLOSURE JOURNAL

SILICON ETCHED RESERVOIR FOR BUBBLE CONTROL
Donald J. Drake
Andrew W. Hays
James F. ONeill
Steven J. Diet1

Proposed Classification
U. S. C1. 347/092 Int. CL B41j 02/19

22 L

74

FIG. 7

XEROX DISCLOSURE JOURNAL - Vol. 23, No. 5 SeptembedOctober 1998 219

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Page 2 of 4

SILICON ETCHED RESERVOIR FOR BUBBLE CONTROL (CONT'D)

I

'-

FIG. 2

74 12 -'

FIG. 3

220 XEROX DISCLOSURE JOURNAL - Vol. 23, No. 5 September/October 1998

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Page 3 of 4

SILICON ETCHED RESERVOIR FOR BUBBLE CONTROL (CONT'D)

The generation of bubbles in the silicon etched reservoir of thermal ink jet devices is known to be a significant source of print quality defects. A new design, shown in FIG. 1, includes a silicon channel plate 10 bonded to a heater plate 12 having heater resistors 14 located in a pit formed in a polyimide layer 16. Ink is introduced into reservoir 18 through inlet 20. When resistor 14 is heated, ink is ejected from nozzles 22. Note that the reservoir 20 cross section converges to a minimum cross section moving from bottom heater plate 12 to top ink inlet 20. This narrowing at the inlet has been shown to trap bubbles which form and grow at the heater plate surface. These bubbles have been correlated with print quality defects such as missing jets. This problem seems to be particularly troublesome for a new generation of ink jet printheads, since their higher r...