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ROOF CLAMPING FOR ROOFSHOOTE THERMAL INK JET PRINTHEAD

IP.com Disclosure Number: IPCOM000025968D
Original Publication Date: 1989-Jun-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 6 page(s) / 205K

Publishing Venue

Xerox Disclosure Journal

Abstract

An important difference between the sideshooter thermal ink jet printhead 10 of Figure 1 and the roofshooter thermal ink jet printhead 20 of Figure 2 is that the sideshooters are clamped structures. The sideshooter is shown in the typical schematic, cross-sectional view with the main ink supply 11, such as an ink supply cartridge, clamped to it. The cartridge is clamped to the printhead with the printhead inlet 12 sealed to the cartridge by a gasket 13. The two major components of the printhead are the silicon channel plate 14 having ink flow passages of ink channel 15 and manifold 16 anisotropically etched therein, and the heater plate 18 having the heaters 17 and addressing electrodes (not shown) formed on the surface thereof that confront the channel plate. A thick film layer 19, such as Vacrela, is sandwiched between the heater plate and channel plate and is etched to expose the heaters. The etched thick film layer places the heaters in a pit 21 to control the bubble growth. Thus, there is a compressive force constantly exerted on all of the layers of the sideshooter configuration, so that even if the adhesion of the thick film layer is lost, failure of the printhead is unlikely because of the compression clamping depicted by arrows 22,23.

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Page 1 of 6

IXEROX DISCLOSURE JOURNAL

ROOF CLAMPING FOR ROOFSHOOTE K Proposed Classification THERMAL INK JET PRINTHEAD
Donald J. Drake

U.S. C1.346/140R
Int.
C1. Gold 15/16

ll-1

I J

FIG. I

26 17

I

t,

30

-

C

 I I/ 1 L

25

FIG. 2

Volume 14 Number 3 May/June 1989 111

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

Page 2 of 6

ROOF CLAMPING FOR ROOFSHOOTEH THERMAL INK JET PKINTHEAD (Cont'd)

112

25 NG. 3

32 33 27

35

I

I

25 -

FIG. 4

NG. 5

 XEROX DISCLOSURE JOURNAL Volume 14 Number 3 May/June 1989

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

Page 3 of 6

ROOF CLAMPING FOR ROOFSHOOTER THERMAL INK cTET PRINTHEAD (Cont'd)

FIG. 6

An important difference between the sideshooter thermal ink jet printhead 10 of Figure 1 and the roofshooter thermal ink jet printhead 20 of Figure 2 is that the sideshooters are clamped structures. The sideshooter is shown in the typical schematic, cross-sectional view with the main ink supply 11, such as an ink supply cartridge, clamped to it. The cartridge is clamped to the printhead with the printhead inlet 12 sealed to the cartridge by a gasket 13. The two major components of the printhead are the silicon channel plate 14 having ink flow passages of ink channel 15 and manifold 16 anisotropically etched therein, and the heater plate 18 having the heaters 17 and addressing electrodes (not shown) formed on the surface thereof that confront the channel plate. A thick film layer 19, such as Vacrela, is sandwiched between the heater plate and channel plate and is etched to expose the heaters. The etched thick film layer places the heaters in a pit 21 to control the bubble growth. Thus, there is a compressive force constantly exerted on all of the layers of the sideshooter configuration, so that even if the adhesion of the thick film layer is lost, failure of the printhead is unlikely because of the compression clamping depicted by arrows 22,23.

 XEROX DISCLOSURE JOURNAL Volume 14 Number 3 May/June 1989 113

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

Page 4 of 6

ROOF CLAMPING FOR ROOFSHOOTER THERMAL INK JET P RINTH E AD (Cont 'd)

In contrast, the roofshooter type thermal ink jet printhead 20 is not clamped because the ink enters from underneath the heater plate 25, as shown in Figure 2. Instead of a channel plate, the roofshooter uses a nozzle plate 26 which is adhesively bonded to the heater plate. The nozzle plate has ink flow passages 27 to direct the ink from the inletheservoir 28 to the heaters 30, and the main ink reservoir 29 is sealingly attached to the surface of the heater plate opposite the one with the heaters. Therefore, if adhesion of the nozzle plate 26 to the heater plate 25 is lost, the nozzle plate is free to c'ebond, causing printhead failure.

Several methods for clamping the roofshooter nozzle plate to the heater plate is shown in Figures 3-5 which eliminate the potential debonding failure mode. Figures 3-5 are all schematic cross-sectional views of a roofshooter printhead configuratio...