Browse Prior Art Database

SPLIT LEVEL CHANNELS FOR IMPROVED BUBBLE JET PERFORMANCE

IP.com Disclosure Number: IPCOM000026366D
Original Publication Date: 1991-Aug-31
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 95K

Publishing Venue

Xerox Disclosure Journal

Abstract

A recent advance in bubble jet performance has come about as a result of addition of the "pit layer", as disclosed in U.S. Patent 4,638,337. In that patent, the pit layer puts the bubble jet resistor in a recess, so that the force of the bubble is directed vertically upward. The roof of the channel is very far from the resistor, however, as a result of the combined depth of the pit and height of the roof. Operational improvement may be achieved by changing the etching process for formation of the channels to lower the roof. The channel 12 of printhead 10 should be divided in two portions 14,16 as shown in the figure below. The lower roof 18 should increase drop velocity and frequency response.

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XEROX DISCLOSURE JOURNAL

Proposed Classification

SPLIT LEVEL CHANNELS FOR IMPROVED BUBBLE JET U.S. C1.346/140R PERFORMANCE Int. C1. GOlD 15/18 William G. Hawkins

XEROX DISCLOSURE JOURNAL - VO~. 16, NO. 4 July/August 1991 237

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SPLIT LEVEL CHANNELS FOR IMPROVED BUBBLE JET PE RFO RMANC E (con t'd)

A recent advance in bubble jet performance has come about as a result of addition of the "pit layer", as disclosed in U.S. Patent 4,638,337. In that patent, the pit layer puts the bubble jet resistor in a recess, so that the force of the bubble is directed vertically upward. The roof of the channel is very far from the resistor, however, as a result of the combined depth of the pit and height of the roof. Operational improvement may be achieved by changing the etching process for formation of the channels to lower the roof. The channel 12 of printhead 10 should be divided in two portions 14,16 as shown in the figure below. The lower roof 18 should increase drop velocity and frequency response.

In the figure, a cross-sectional view of one ink channel 12 of printhead 10 is shown in channel plate 11. A recess or pit 20 is formed in the pit layer 22 in registration with the heater 24 shown schematically on heater plate 26. Instead of a single continuous channel, it is etched in two portions 14 and 16, so that roof portion 18 is directly above recess 20. When the heater is pulses with a current pulse, a temporar...