EP0314388A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Thermal drop-on-demand ink jet printer print head
Assignee: Lexmark International Inc
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Filing: 1988-10-20
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Granted: —
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Expires: 2008-10-20
Abstract
Abstract The invention relates to a thermal drop-on-demand ink jet printer print head comprising a thermally conductive substrate member (10), a plurality of spaced apart heating elements (12) on a surface of the substrate member, a first electrical connection member (15) on the surface of the substrate member and in contact with all of the heating elements, a plurality of second electrical connection members (16) on the surface of the substrate member, each of the second electrical connection members being in electrical contact with a respective one of the heating elements, and a heat shield for preventing the flow of heat between adjacent heating elements. According to the invention, the print head is characterised in that the heat shield comprises a plurality of heat conducting elements on the surface of the substrate member and extending into the spaces between adjacent heating elements, each of the heat conducting elements being integrally connected to one of the electrical connection members whereby the heat conducting elements conduct heat away from the spaces between the heating elements.
Inventors
- 👤 Robert Charles Durbeck
- 👤 Jerome Michael Eldridge
- 👤 Francis Chee-Shuen Lee
- 👤 Graham Olive
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 05:46
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/135; B41J2/14; B41J2/14016; B41J2/14072; B41J2/14088; B41J2/14112; B41J2/14129; B41J2002/14379
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
164 words
A thermal drop-on-demand ink jet printer print head comprising a thermally conductive substrate member (10), a plurality of spaced apart heating elements (12) on a surface of said substrate member, a first electrical connection member (15) on said surface of said substrate member and in contact with all of said heating elements, a plurality of second electrical connection members (16) on said surface of said substrate member, each of said second electrical connection members being in electrical contact with a respective one of said heating elements, and a heat shield (18) for preventing the flow of heat between adjacent heating elements, characterised in that said heat shield (18) comprises a plurality of heat conducting elements (20; 22; 24, 26; 28) on said surface and extending into the spaces between adjacent heating elements (12), each of said heat conducting elements being integrally connected to one of said electrical connection members whereby said heat conducting elements conduct heat away from the spaces between said heating elements.
Claim 2
Dependent Claim
164 words
A thermal drop-on-demand ink jet printer print head comprising a thermally conductive substrate member (10), a plurality of spaced apart heating elements (12) on a surface of said substrate member, a first electrical connection member (15) on said surface of said substrate member and in contact with all of said heating elements, a plurality of second electrical connection members (16) on said surface of said substrate member, each of said second electrical connection members being in electrical contact with a respective one of said heating elements, and a heat shield (18) for preventing the flow of heat between adjacent heating elements, characterised in that said heat shield (18) comprises a plurality of heat conducting elements (20; 22; 24, 26; 28) on said surface and extending into the spaces between adjacent heating elements (12), each of said heat conducting elements being integrally connected to one of said electrical connection members whereby said heat conducting elements conduct heat away from the spaces between said heating elements.
Claim 3
Dependent Claim
26 words
A print head as claimed in claim 1 characterised in that said heat conducting elements (12) are all connected to said first electrical connection member (15).
Claim 4
Dependent Claim
31 words
A print head as claimed in claim 1 characterised in that each of said heat conducting elements (12) is connected to a respective one of said second electrical connection members (16).
Claim 5
Dependent Claim
69 words
A print head as claimed in claim 1 characterised in that a first set (24) of said heat conducting elements are connected to said first electrical connection member (15), a second set (26) of said heat conducting elements are each connected to a respective one of said array of second electrical connection members (16) and the elements of said first and second sets of heat conducting elements are interleaved.
Claim 6
Dependent Claim
49 words
A print head as claimed in any one of the preceding claims characterised in that it comprises a heat insulation layer (13) deposited on a surface of said substrate member (10), and in that said heat conducting elements (20; 22; 24, 26; 28) are on said heat insulation layer.
Claim 7
Dependent Claim
56 words
A print head as claimed in claim 5 characterised in that said heat insulation layer (13) has a nominal thickness, and in that the thickness of said heat insulation layer under said electrical connection members (15, 16) is less than said nominal thickness, whereby said electrical connection members provide enhanced thermal conduction to said substrate member.
Claim 8
Dependent Claim
59 words
A print head as claimed in claim 5 characterised in that said heat insulation layer (13) has a nominal thickness, and in that the thickness of said heat insulation layer under said heat conducting elements (20; 22; 24, 26; 28) is less than said nominal thickness, whereby said heat conducting elements provide enhanced thermal conduction to said substrate member.
Claim 9
Dependent Claim
74 words
A print head as claimed in any one of the preceding claims 1 to 4 characterised in that it comprises a heat insulation layer (13) deposited on a surface of said substrate member (10), and in that the portions said heat insulation layer (13) under said heat conducting elements (20; 22; 24, 26; 28) have been removed whereby said heat conducting elements are in direct thermal contact with said surface of said substrate member.
References Cited (Backward Citations)
No citation records indexed.
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