US5157414A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thick film type thermal head and thermal recording device
Assignee: Hitachi Ltd
•
Filing: 1990-08-07
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Granted: 1992-10-20
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Expires: 2010-08-07
Abstract
Abstract A thick film type thermal head produced by consecutively forming, on an insulator substrate, a heat-resistant layer, an electrode, a heating resistor and a protective layer, wherein the protective layer comprises an electrically insulating protective layer covering the heating resistor and that portion of the electrically insulating protective layer which corresponds to a medium comprises a heat-diffusing coating having a high thermal conductivity over the electrically insulating protective layer.
Inventors
- 👤 Taisaku Seino
- 👤 Michihiro Watanabe
- 👤 Munetoshi Zen
- 👤 Kazutaka Sato
- 👤 Shigeru Obata
- 👤 Maya Arai
- 👤 Kazuhiko Atou
- 👤 Kentaro Hamma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:16
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/315; B41J2/32; B41J2/335; B41J2/33505; B41J2/33525; B41J2/3353; B41J2/33535; B41J2/33555; B41J2/3357; B41J2/345
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
89 words
A thick film type thermal head produced by consecutively forming, on an insulator substrate, a heat-resistant layer, an electrode, a heating resistor and a protective layer, wherein the protective layer comprises an electrically insulating protective layer covering the heating resistor and a heat-diffusing coating disposed on a surface portion of the electrically insulating protective layer corresponding to a medium and opposite to a surface of the electrically insulating protective layer directly contacting the heating resistor, the heat-diffusing coating having a higher thermal conductivity than the electrically insulating protective layer.
Claim 2
Dependent Claim
89 words
A thick film type thermal head produced by consecutively forming, on an insulator substrate, a heat-resistant layer, an electrode, a heating resistor and a protective layer, wherein the protective layer comprises an electrically insulating protective layer covering the heating resistor and a heat-diffusing coating disposed on a surface portion of the electrically insulating protective layer corresponding to a medium and opposite to a surface of the electrically insulating protective layer directly contacting the heating resistor, the heat-diffusing coating having a higher thermal conductivity than the electrically insulating protective layer.
Claim 3
Dependent Claim
20 words
A thick film type thermal head according to claim 1, wherein the heat-diffusing coating is constituted of a metal film.
Claim 4
Dependent Claim
31 words
A thick film type thermal head according to claim 2, wherein the heat-diffusing coating is formed in a band form such that the heat-diffusing coating is positioned above the heating resistor.
Claim 5
Dependent Claim
27 words
A thick film type thermal head according to claim 2, which further has a protective film having electrical conductivity as a topmost film on the heat-duffusing coating.
Claim 6
Dependent Claim
23 words
A thick film type thermal head according to claim 4, wherein the protective film having electrical conductivity comprises a smooth surfaced protective film.
Claim 7
Dependent Claim
29 words
A thick film type thermal head according to claim 4, wherein the heat-diffusing coating is formed in a band form such that it is positioned above the heating resistor.
Claim 8
Dependent Claim
38 words
A thick film type termal head according to claim 6, wherein the heating resistor corresponds to pixels and the heat-diffusing coating intermediately present is an etched coating forming divided parallelogram patterns corresponding to pixels from the heating resistor.
Claim 9
Dependent Claim
37 words
A thick film type thermal head according to claim 3, wherein the heating resistor corresponds to pixels and the heat-diffusing coating is divided and formed by etching so as to correspond to pixels from the heating resistor.
Claim 10
Dependent Claim
43 words
A thick film type thermal head according to claim 3, wherein the heating resistor corresponds to pixels and the heat-diffusing coating is divided and formed by etching so as to deviate by half a pitch with regard to pixels from the heating resistor.
Claim 11
Dependent Claim
25 words
A thick film type thermal head according to claim 3, wherein the heat-diffusing coating is an etched coating forming trapezoid patterns alternately arranged upside down.
Claim 12
Dependent Claim
36 words
A thick film type thermal head according to claim 3, wherein the heating resistor corresponds to pixels and the heat-diffusing coating is an etched coating forming divided parallelogram patterns corresponding to pixels from the heating resistor.
Claim 13
Dependent Claim
23 words
A thick film type thermal head according to claim 1, wherein the heat-diffusing coating is constituted of a gold, silver or copper film.
Claim 14
Dependent Claim
138 words
A thick film type thermal head produced by consecutively forming, on an insulator substrate, a heat-resistant layer, an electrode, a heating resistor and a protective layer, wherein the protective layer comprises an electrically insulating protective layer covering the heating resistor and a heat-diffusing metal film coating formed as a band and disposed on a surface portion of the electrically insulating protective layer corresponding to a medium and opposite to a surface of the electrically insulating protective layer directly contacting the heating resistor, the heat-diffusing coating having a higher thermal conductivity than the electrically insulating protective layer and being positioned above the heating resistor such that the heat-diffusing coating has a center line deviating toward a side on which a coloring medium consisting of a heat transfer ink film and a recording sheet or a thermal sheet is fed.
Claim 15
Dependent Claim
138 words
A thick film type thermal head produced by consecutively forming, on an insulator substrate, a heat-resistant layer, an electrode, a heating resistor and a protective layer, wherein the protective layer comprises an electrically insulating protective layer covering the heating resistor and a heat-diffusing metal film coating formed as a band and disposed on a surface portion of the electrically insulating protective layer corresponding to a medium and opposite to a surface of the electrically insulating protective layer directly contacting the heating resistor, the heat-diffusing coating having a higher thermal conductivity than the electrically insulating protective layer and being positioned above the heating resistor such that the heat-diffusing coating has a center line deviating toward a side on which a coloring medium consisting of a heat transfer ink film and a recording sheet or a thermal sheet is fed.
Claim 16
Dependent Claim
127 words
A thick film type thermal head produced by consecutively forming, on an insulator substrate, a heat-resistant layer, an electrode, a heating resistor and a protective layer, wherein the protective layer comprises an electrically insulating protective layer covering the heating resistor and a heat-diffusing metal film coating formed as a band and disposed on a surface portion of the electrically insulating protective layer corresponding to a medium and opposite to a surface of the electrically insulating protective layer directly contacting the heating resistor, the heat-diffusing coating having a higher thermal conductivity than the electrically insulating protective layer and being positioned above the heating resistor, the heating resistor having a center line deviating toward a coloring medium feeding side with regard to a top portion of the heating resistor.
Claim 17
Dependent Claim
127 words
A thick film type thermal head produced by consecutively forming, on an insulator substrate, a heat-resistant layer, an electrode, a heating resistor and a protective layer, wherein the protective layer comprises an electrically insulating protective layer covering the heating resistor and a heat-diffusing metal film coating formed as a band and disposed on a surface portion of the electrically insulating protective layer corresponding to a medium and opposite to a surface of the electrically insulating protective layer directly contacting the heating resistor, the heat-diffusing coating having a higher thermal conductivity than the electrically insulating protective layer and being positioned above the heating resistor, the heating resistor having a center line deviating toward a coloring medium feeding side with regard to a top portion of the heating resistor.
Claim 18
Dependent Claim
83 words
A thick film type thermal head produced by consecutively forming, on an insulator substrate, a heat-resistant layer, an electrode, a heating resistor and a protective layer, wherein a heat-diffusing coating constituted of an electrically conductive metal film is formed as a band on the heating resistor, and the protective layer is formed on the heat-diffusing coating, and an electrically insulating film is formed in a boundary between the heating resistor and the heat-diffusing coating to prevent current from flowing into the heat-diffusing coating.
Claim 19
Dependent Claim
83 words
A thick film type thermal head produced by consecutively forming, on an insulator substrate, a heat-resistant layer, an electrode, a heating resistor and a protective layer, wherein a heat-diffusing coating constituted of an electrically conductive metal film is formed as a band on the heating resistor, and the protective layer is formed on the heat-diffusing coating, and an electrically insulating film is formed in a boundary between the heating resistor and the heat-diffusing coating to prevent current from flowing into the heat-diffusing coating.
References Cited (Backward Citations)
US458739A
Cited
JPS5584683A
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JPS5789980A
Cited
JPS5789978A
Cited
JPS60129273A
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JPS6129554A
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JPS6428849A
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JPH03203070A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-10-20 | 1996-04-20 | 1996-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-20 | 2000-04-20 | 2000-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-20 | 2004-04-20 | 2004-10-20 | $7700.00 | Window Closed / Lapsed |