EP0110494A2
Expired / Lapsed
EP
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Thermal ink jet printer
Assignee: HP Inc
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Filing: 1983-07-18
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Granted: —
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Expires: 2003-07-18
Abstract
Abstract A thermal ink jet printer utilizes a printhead resistor which has a central conductive region (23) to excite bubble growth and to cause ejection of ink droplets. The existence of the central conductive region causes bubbles to be created which are toroidal in shape and which fragment during collapse, thereby randomly distributing the resultant acoustic shock across the surface of the printhead resistor and minimizing cavitation damage.
Inventors
- 👤 John David Meyer
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 09:25
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/135; B41J2/14; B41J2/14016; B41J2/14088; B41J2/14112; B41J2/1412; B41J2202/00; B41J2202/01; B41J2202/03; B41J2202/11
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
30 words
A thermal ink jet printer printhead resistor comprising: a resistive region (21); and characterized in that a conductive region (23) is located within the resistive region and electrically connected thereto.
Claim 2
Dependent Claim
30 words
A thermal ink jet printer printhead resistor comprising: a resistive region (21); and characterized in that a conductive region (23) is located within the resistive region and electrically connected thereto.
Claim 3
Dependent Claim
25 words
A printhead resistor according to claim 1, characterized in that the resistivity of the conductive region is less than the resistivity of the resistive region.
Claim 4
Dependent Claim
29 words
A printhead resistor according to either one of claims 1 and 2 characterized in that the conductive region is located at substantially the geometric center of the resistive region.
Claim 5
Dependent Claim
20 words
A printhead resistor according to any one of the preceding claims characterized in that the conductive region is substantially circular.
Claim 6
Dependent Claim
20 words
A printhead resistor according to any one of the preceding claims characterized in that the conductive region comprises gold film.
Claim 7
Dependent Claim
80 words
A thermal ink jet printer printhead resistor characterized by: first (39a,41a,39b), second (41b,37,41c) and third (39c,41d,39d) current paths electrically connected in parallel; a first insulator (35) between the first and second current paths; a second insulator (35) between the second and third current paths; the first and third current paths each comprising a central resistive region (41a;41d) and conductive regions (39a,39b;39c,39d) connected thereto; and the second current path comprising a central conductive region (37) and resistive regions (41b,41c) connected thereto.
Claim 8
Dependent Claim
80 words
A thermal ink jet printer printhead resistor characterized by: first (39a,41a,39b), second (41b,37,41c) and third (39c,41d,39d) current paths electrically connected in parallel; a first insulator (35) between the first and second current paths; a second insulator (35) between the second and third current paths; the first and third current paths each comprising a central resistive region (41a;41d) and conductive regions (39a,39b;39c,39d) connected thereto; and the second current path comprising a central conductive region (37) and resistive regions (41b,41c) connected thereto.
Claim 9
Dependent Claim
23 words
A printhead resistor according to claim 6 characterized in that the resistance of the first, second and third current paths are substantially equal.
Claim 10
Dependent Claim
35 words
A printhead resistor according to claim 7 characterized in that the central conductive region (37) of the second current path is substantially equidistant from the conductive regions (39a,39b,39c,39d) of the first and third current paths.
Claim 11
Dependent Claim
25 words
A printhead resistor according to claim 8, characterized in that the resistivity of the conductive regions is less than the resistivity of the resistive regions.
Claim 12
Dependent Claim
16 words
A printhead resistor according to claim 9 characterized in that the conductive regions comprise gold film.
Claim 13
Dependent Claim
57 words
ll. A thermal ink jet printer, responsive to a control signal, for ejecting an ink droplet from an ink supply, the thermal ink jet printer comprising a printhead resistor underlying the ink supply for receiving the control signal, and being characterized in that the printhead resistor is as set forth in any one of the preceding claims.
References Cited (Backward Citations)
No citation records indexed.
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