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DIRECTION SIDESHOOTER BUBBLE JET PRINTHEAD

IP.com Disclosure Number: IPCOM000025965D
Original Publication Date: 1989-Jun-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 4 page(s) / 119K

Publishing Venue

Xerox Disclosure Journal

Abstract

The roofshooter type thermal ink jet printhead 10, shown in schematic cross-sectional view in Figure 1, is capable of relatively high frequency operation (up to 15 kHz). It is speculated that one of the reasons for this is that the fluid 11 to form the drop 12 moves in the same direction as the main growth component, shown as arrows 16 of bubble expansion (i.e., the drop moves perpendicular to the heater 15 on heater plate 21). Therefore, much of the momentum imparted by the bubble 14 in its favored expansion direction (perpendicular to its plane) can be used to expel the drop from nozzle 13 of nozzle plate 17.

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Page 1 of 4

DIRECTION SIDESHOOTER BUBBLE JET PRINTHEAD
Donald J. Drake

Proposed Classification

US. C1.346175 Int. C1. Gold 15/18

/ \

71 \ I

\

21

FIG. 2

Volume 14 Number 3 May/June 1989 101

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Page 2 of 4

DIRECTION SIDESHOOTER BUBBLE JET PRINTMEAD (Cont'd)

1s

33 35

7

7

12

I

14 36

FIG. 3

35

15

 XEROX DISCLOSURE JOURNAL
Volume 14 Number 3 May/June 1989

92

36

36

I

FIG. 4

102

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Page 3 of 4

DIRECTION SIDESHOOTER BUBBLE JET PRINTHEAD (Cont'd)

The roofshooter type thermal ink jet printhead 10, shown in schematic cross- sectional view in Figure 1, is capable of relatively high frequency operation (up to 15 kHz). It is speculated that one of the reasons for this is that the fluid 11 to form the drop 12 moves in the same direction as the main growth component, shown as arrows 16 of bubble expansion (i.e., the drop moves perpendicular to the heater 15 on heater plate 21). Therefore, much of the momentum imparted by the bubble 14 in its favored expansion direction (perpendicular to its plane) can be used to expel the drop from nozzle 13 of nozzle plate 17.

In a conventional sideshooter rinthead 20, shown in schematic cross-sectional

to expel the drop 12. Instead, the momentum must undergo a 90" change as represented by vectors 16 and approximately half of the momentum is used to expel the drop 12 while the other half pushes fluid back in the refill channel
18. The result is that refill is actually the sum of replacin the drop volume as

reservoir 19 in channel plate 22. This is true even if optional thick film layer 36, which is used to place the heater 15 in a pit 23, is omitted.

A modified sideshooter printhead 30 has an ink channel 32 t...