Patent EP0120160A2 successfully refreshed from Google Patents.
EP0120160A2
Expired / Lapsed
EP
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Method for reducing erosion due to cavitation in ink jet printers
Assignee: HP Inc
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Filing: 1983-11-09
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Granted: —
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Expires: 2003-11-09
Abstract
Abstract A novel structure which reduces stress due to cavitation in a thermal ink jet head is disclosed. A jetting resistor (30) is formed on a thin membrane (70) and suspended in contact with an acoustic absorber (90) such as silicone oil on its back surface. The pressure wave created by the collapsing bubble which occurs in the ink on the membrane front surface each time the resistor is fired is thus absorbed by the silicon oil. The failure rate of such a jetting resistor is thus substantially reduced.
Inventors
- 👤 James H. Boyden
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-10 01:05
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/135; B41J2/14; B41J2/14016; B41J2/14088; B41J2/14112; B41J2/14129; B41J2/17
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
88 words
An apparatus for jetting a fluid from a reservoir through an orifice, comprising: a substrate (130) forming at least a portion of a wall of the reservoir; a cavity (80) in the substrate; and characterized by a membrane (70) covering the cavity; jetting means (30) coupled to the membrane and positioned in proximity with the cavity for producing an expansion force in the fluid; and absorber means (90) in the cavity and coupled to the membrane for absorbing a contracting force produced in response to the expanding force.
Claim 2
Independent Claim
88 words
An apparatus for jetting a fluid from a reservoir through an orifice, comprising: a substrate (130) forming at least a portion of a wall of the reservoir; a cavity (80) in the substrate; and characterized by a membrane (70) covering the cavity; jetting means (30) coupled to the membrane and positioned in proximity with the cavity for producing an expansion force in the fluid; and absorber means (90) in the cavity and coupled to the membrane for absorbing a contracting force produced in response to the expanding force.
Claim 3
Dependent Claim
14 words
An apparatus according to claim 1 characterized in that the membrane comprises silicon carbide.
Claim 4
Independent Claim
49 words
An apparatus according to either one of claims 1 and 2 characterized in that the jetting means comprises a resistor, the expansion force is produced by a bubble formed by heating the resistor with an electrical current, and the contracting force is produced by the collapse of the bubble.
Claim 5
Independent Claim
29 words
An apparatus according to any one of the preceding claims characterized in that the absorber means (90) has substantially the same acoustic impedance as the fluid in the reservoir.
Claim 6
Independent Claim
24 words
An apparatus according to any one of the preceding claims characterized in that the absorber means (90) comprises silicone oil or a silicone elastomer.
Claim 7
Dependent Claim
20 words
An apparatus according to claim 5 characterized in that the absorber means (90) further comprises a suspension of solid particles.
Claim 8
Independent Claim
93 words
An apparatus for preventing cavitation damage by bubbles produced in a fluid in a reservoir, comprising; a substrate (10) forming at least a portion of a wall of the reservoir; a cavity (80) in the substrate, and characterized by a membrane (70) covering the cavity; bubble producer means (30) coupled to the membrane (70) and positioned in proximity to the cavity (80) for producing bubbles in the fluid; and absorber means (90) in the cavity and coupled to the membrane for absorbing a force produced by collapse of the bubbles in the fluid.
Claim 9
Independent Claim
93 words
An apparatus for preventing cavitation damage by bubbles produced in a fluid in a reservoir, comprising; a substrate (10) forming at least a portion of a wall of the reservoir; a cavity (80) in the substrate, and characterized by a membrane (70) covering the cavity; bubble producer means (30) coupled to the membrane (70) and positioned in proximity to the cavity (80) for producing bubbles in the fluid; and absorber means (90) in the cavity and coupled to the membrane for absorbing a force produced by collapse of the bubbles in the fluid.
Claim 10
Dependent Claim
15 words
An apparatus according to claim 7 characterized in that the membrane (70) comprises silicon carbide.
Claim 11
Independent Claim
34 words
An apparatus according to either one of claims 7 and 8 characterized in that the bubble producer means (30) is a resistor and bubbles are produced by heating the resistor with an electrical current.
Claim 12
Independent Claim
30 words
An apparatus according to amy one of claims 7 to 9 characterized in that the absorber means (90) has substantially the same acoustic impedance as the fluid in the reservoir.
Claim 13
Independent Claim
24 words
An apparatus according to any one of claims 7 to 10 characterized in that the absorber means comprises silicone oil or a silicone elastomer.
Claim 14
Dependent Claim
19 words
An apparatus according to claim 11 characterized in that the absorber means further comprises a suspension of solid particles.
References Cited (Backward Citations)
No citation records indexed.
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