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SIDESHOOTER WITH HIGH FREQUENCY RESPONSE

IP.com Disclosure Number: IPCOM000025966D
Original Publication Date: 1989-Jun-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 4 page(s) / 131K

Publishing Venue

Xerox Disclosure Journal

Abstract

In Figures 1-3, a method is disclosed for increasing the drop generation frequency of a thermal ink jet printhead. In addition, this method provides for longer resistor transducer or heater lifetime. Figure 1 is a schematic cross sectional view of a portion of printhead 10, showing the ink channel in the channel plate 12, etched pit 13 in thick film layer 14 over the heater 15, and heater plate 16 containing on a surface 16a thereof a linear array of haters 15 and addressing electrodes (not shown). One end of the ink channel 18 is open and serves as a drop emitting nozzle 17. The other end of the channel is in communication with an ink reservoir (not shown). The ink channel is divided by projection 19 into a front channel 20 and back channel 22.

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Page 1 of 4

XEROX DISCLOSURE JOURNAL

SIDESHOOTER WITH HIGH FREQUENCY RESPONSE William G. Hawkins
Stephen
F. Pond

Proposed Classification

U.S. C1.346175 Int. C1. Gold 15/18

16 A FIG. 1

- 18

"\

I

BACK CHANNEL FRONT CHANNEL

' 19

FIG. 2

- 18

FRONT CHANNEL

2* \

BACK CHANNEL

Volume 14 Number 3 May/June 1989

FIG. 3

,

105

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

Page 2 of 4

SIDESHOOTER WITH HIGH FREQUENCY RESPONSE (Cont'd)

In Figures 1-3, a method is disclosed for increasing the drop generation frequency of a thermal ink jet printhead. In addition, this method provides for longer resistor transducer or heater lifetime.

Figure 1 is a schematic cross sectional view of a portion of printhead 10, showing the ink channel in the channel plate 12, etched pit 13 in thick film layer 14 over the heater 15, and heater plate 16 containing on a surface 16a thereof a linear array of haters 15 and addressing electrodes (not shown). One end of the ink channel 18 is open and serves as a drop emitting nozzle 17. The other end of the channel is in communication with an ink reservoir (not shown). The ink channel is divided by projection 19 into a front channel 20 and back channel 22.

This configuration is based on two observations which have been made about thermal ink 'et performance. The first observation is that the resistor or

must be toward the front of the channel in order to cause the ink to move forward out of the channel. The forward location is caused by the requirement of achieving sufficient inertial mass behind the resistor to assure that the impulse acts primarily on the ink in front of the resistor. The structure of Figure 1 employs a resistor to reservoir distance (L) of 8 mils and a channel which is triangular in shape with a base (A) of 65pm. Once the channel has been fired, the ink must flow forward to refill the channel before it can be fired again. The refill is governed by viscous flow in the channel, which scales as L/A2.

h ich generates an-impulsive force leading to drop 21 ejection)

The second observation involves lifetime of the transducer structure. the lifetime of three structures has been measured and ranked in order of increasing lifetime, open pool, channel with pit, and channel w...