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US4446355A
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US
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Crossover construction of thermal-head and method of manufacturing same
Assignee: Fujitsu Ltd
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Filing: 1982-02-22
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Granted: 1984-05-01
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Expires: 2002-02-22
Abstract
Abstract A crossover construction of a thermal-head is which the thermal-head comprises: a substrate of insulating material; a plurality of heat elements disposed side by side in one row on said substrate; a plurality of lower thin film conductor patterns each of which connects to each of said heat elements and extends in direction X; an insulating layer disposed over said lower conductors; a plurality of upper conductor patterns disposed in parallel in another direction Y on said insulating layer so as to form a crossover on said substrate, said upper and lower conductors being selectively connected together through openings of said insulating layer, wherein said insulating layer and said upper conductors comprise printed and cured paste of insulating material and conductive material, respectively, each paste being of the low temperature curing type which can be cured at a temperature low enough not to affect the resistance of said thin film lower conductors, and a metallic layer of low resistance is coated on each of said upper conductors.
Inventors
- 👤 Kiyoshi Sato
- 👤 Minoru Terashima
- 👤 Haruo Sorimachi
- 👤 Toshiaki Naka
- 👤 Takeo Kanno
- 👤 Fumiaki Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:01
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/315; B41J2/32; B41J2/345; H; H05; H05K; H05K3/00; H05K3/46; H05K3/4644; H05K3/4664; H10; H10N; H10N97/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49083; Y10T29/49099
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
173 words
A crossover construction of a thermal-head in which the thermal-head comprises: (a) a substrate of insulating material; (b) a plurality of heat elements disposed side by side in one row on said substrate; (c) a plurality of lower thin film conductor patterns, each of which connects to each of said heat elements and extends in direction X; (d) an insulating layer disposed over said lower conductors; (e) plurality of upper conductor patterns disposed in parallel in another direction Y on said insulating layer so as to form a crossover on said substrate, wherein said upper and lower conductors are selectively connected together through openings of said insulating layer, and wherein said insulating layer and said upper conductors comprise printed and cured paste of insulating material and conductive material, respectively, each paste being of the low temperature curing type which can be cured at a temperature low enough not to affect the resistance of said thin film lower conductors; and (f) a metallic layer of low resistance coated on each of said upper conductors.
Claim 2
Dependent Claim
173 words
A crossover construction of a thermal-head in which the thermal-head comprises: (a) a substrate of insulating material; (b) a plurality of heat elements disposed side by side in one row on said substrate; (c) a plurality of lower thin film conductor patterns, each of which connects to each of said heat elements and extends in direction X; (d) an insulating layer disposed over said lower conductors; (e) plurality of upper conductor patterns disposed in parallel in another direction Y on said insulating layer so as to form a crossover on said substrate, wherein said upper and lower conductors are selectively connected together through openings of said insulating layer, and wherein said insulating layer and said upper conductors comprise printed and cured paste of insulating material and conductive material, respectively, each paste being of the low temperature curing type which can be cured at a temperature low enough not to affect the resistance of said thin film lower conductors; and (f) a metallic layer of low resistance coated on each of said upper conductors.
Claim 3
Dependent Claim
29 words
A crossover construction according to claim 1, in which each of said lower conductors has a contacting portion extending in direction Y so as to contact said upper conductor.
Claim 4
Dependent Claim
30 words
A crossover construction according to claim 2, in which said insulating layer has a plurality of parallelogram-shaped longitudinal openings each of which includes at least two of said contacting portions.
Claim 5
Dependent Claim
22 words
A crossover construction according to claim 3, in which the longitudinal edges of said opening are inclined with respect to direction Y.
Claim 6
Dependent Claim
19 words
A crossover construction according to claim 1, in which said conductive paste includes powder of silver as a conductor.
Claim 7
Dependent Claim
37 words
A crossover construction according to claim 5, in which said upper conductor comprises a nickel plated layer between said conductor paste and said metallic coating thereon so as to avoid diffusion of silver into said metallic coating.
Claim 8
Dependent Claim
16 words
A crossover construction according to claim 6, in which said metallic coating is made of gold.
Claim 9
Dependent Claim
20 words
A crossover construction according to claim 1, in which the density of said upper conductors is more than one line/mm.
Claim 10
Independent Claim
186 words
A method of manufacturing a crossover of a thermal-head in which the thermal-head has a substrate of insulating material; a plurality of heat elements disposed side by side in one row on said substrate; a plurality of lower thin film conductor patterns each of which connects to each of said heat elements and extends in direction X; an insulating layer disposed over said lower conductors; and a plurality of upper conductor patterns disposed in parallel in another direction Y on said insulating layer so as to form a crossover on said substrate, said upper and lower conductors being selectively connected together through openings of said insulating layer, wherein the process comprises the steps of: (a) forming said insulating layer and said upper conductors by printing and curing paste of insulating material and conductive material, respectively, each paste being of the low temperature curing type which can be cured at a temperature low enough not to affect the resistance of said thin film lower conductors, and (b) after curing said upper conductors of paste, coating a metallic layer of low resistance on each of said upper conductors.
Claim 11
Independent Claim
186 words
A method of manufacturing a crossover of a thermal-head in which the thermal-head has a substrate of insulating material; a plurality of heat elements disposed side by side in one row on said substrate; a plurality of lower thin film conductor patterns each of which connects to each of said heat elements and extends in direction X; an insulating layer disposed over said lower conductors; and a plurality of upper conductor patterns disposed in parallel in another direction Y on said insulating layer so as to form a crossover on said substrate, said upper and lower conductors being selectively connected together through openings of said insulating layer, wherein the process comprises the steps of: (a) forming said insulating layer and said upper conductors by printing and curing paste of insulating material and conductive material, respectively, each paste being of the low temperature curing type which can be cured at a temperature low enough not to affect the resistance of said thin film lower conductors, and (b) after curing said upper conductors of paste, coating a metallic layer of low resistance on each of said upper conductors.
Claim 12
Dependent Claim
26 words
A method of manufacturing a crossover according to claim 9, in which the process of printing and curing said insulating layer is repeated at least twice.
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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) | 1987-05-01 | 1987-10-31 | 1988-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-01 | 1991-10-31 | 1992-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-01 | 1995-10-31 | 1996-05-01 | $7700.00 | Window Closed / Lapsed |