Browse Prior Art Database

PRECISELY ALIGNED FOUR-COLOR CONTINUOUS INK JET DROP GENERATOR

IP.com Disclosure Number: IPCOM000025800D
Original Publication Date: 1988-Apr-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 4 page(s) / 216K

Publishing Venue

Xerox Disclosure Journal

Abstract

Figure 1 shows a cross-sectional side view of the basic construction of a single color, continuous stream type thermal ink jet drop generator 10. It is fabricated by aligning and bonding the etched silicon channel plate 12 to a silicon heater plate 14 its taught by U.S. 4,601,777. Man die can be made on

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XEROX DISCLOSURE JOURNAL

PRECISELY ALIGNED FOUR-COLOR Proposed Classification
CONTINUOUS INK JET DROP
GENERATOR Int. C1. H01121/306
Donald J. Drake

U.S. C1.156/626

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Volume 13 Number 2 March/April 1988 57

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PRECISELY ALIGNED FOUR-COLOR CONTINUOUS INK JET DROP GENERATOR (Cont'd)

58

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34 Fig. 4

36' Fig. 5

  XEROX DISCLOSURE JOURNAL Volume 13 Number 2 March/April 1988

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PRECISELY ALIGNED FOUR-COLOR CONTINUOUS INK JET DROP GENERATOR (Cont'd)

Figure 1 shows a cross-sectional side view of the basic construction of a single color, continuous stream type thermal ink jet drop generator 10. It is fabricated by aligning and bonding the etched silicon channel plate 12 to a silicon heater plate 14 its taught by U.S. 4,601,777. Man die can be made on

their res ective channel die. The etched channel plate has the ink fill hole 16

connecting to the fill hole with its opposite open end serving as nozzle 20. The heater plate has a resistive heater 22 aligned in each channel a predetermined distance upstream from the nozzle. Passivated aluminum leads 24 connect the heaters to contact pads 26 whereat voltage sources and ground connection may be made by, for example, wire bonding (not shown).

a single wafer and the heater die can be simultaneously a

T igned and bonded to

and a p 1p urality of individual parallel channels 18, each having one end

For four-color printing applications, one can simply use four different printheads mounted in some aligning frame. However, it is difficult to mount four separate printheads with the alignment tolerances required by high resolution printing.

A method for fabricating a four-color drop generator that accurately aligns each drop generator which is inexpensive and manufacturable, is described below, wherein all fabrication is performed on silicon wafers and the resultant drop generator is small and light.

In Figure 2, a two-color generator is made by stacking one channel plate 30 on top of a combination channellheater plate 32, which is itself stacked on another heater plate 34. This cross-sectional schematic would seem to indicate a problem with the fluid path for drop generator 32, 34. It appears that the fill hole 36 cuts across the heater aluminum lead 24 going back to the contact pad 26. However, this does not occur since the fill hole is not a slot but a series of separate fill holes that can side-step the aluminum leads. Figure 3, a view taken along view line 3-3 in Figure 2, shows a top view of plate 34.
Note that the fill holes 36 do not interfere with the aluminum leads. The minimum center to center spacing of these fil...