US4835548A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal head
Assignee: Toshiba Corp
•
Filing: 1987-06-17
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Granted: 1989-05-30
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Expires: 2007-06-17
Abstract
Abstract In a thermal head, an electrical and heat insulating layer of glass is formed on a substrate made of ferrie Fe-Cr stainless steel. Fe-Cr stainless steel contains 16 to 18% chromium by weight. Heating resistors having a specific patterns are formed on the electrical and heat insulating layer and electrically connected to the substrate acting as a common electrode. Lead wires of an Aλ-Si-Cu alloy, as individual electrodes, are formed on the layer and the heating resistors. The heating resistors and the lead wires are covered by a protective layer.
Inventors
- 👤 Masaru Nikadio
- 👤 Yoshiaki Ouchi
- 👤 Tadayoshi Kinoshita
- 👤 Reiko Watanabe
- 👤 Shinzo Sugai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:42
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; B; B41; B41J; B41J2/00; B41J2/315; B41J2/32; B41J2/335; B41J2/33505; B41J2/33525; B41J2/33535; B41J2/3355; B41J2/33555; B41J2/3356; B41J2/3357; B41J2/345; H; H04; H04N; H04N1/00; H04N1/32
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
70 words
A thermal head comprising: (a) a substrate structure; (b) a heating resistor formed on the substrate structure; and (c) an electric conductor formed on the substrate structure and connected electrically to the heating resistor; (d) said substrate structure including an alloy, composed mainly of iron and chromium, and an electrical and heat insulating layer formed on the alloy, wherein said electrical and heat insulating layer is composed mainly of polyimide.
Claim 2
Dependent Claim
70 words
A thermal head comprising: (a) a substrate structure; (b) a heating resistor formed on the substrate structure; and (c) an electric conductor formed on the substrate structure and connected electrically to the heating resistor; (d) said substrate structure including an alloy, composed mainly of iron and chromium, and an electrical and heat insulating layer formed on the alloy, wherein said electrical and heat insulating layer is composed mainly of polyimide.
Claim 3
Dependent Claim
18 words
The thermal head according to claim 1, wherein said alloy contains approximately 5% to 30% chromium by weight.
Claim 4
Dependent Claim
131 words
A thermal head comprising: (a) a substrate structure; (b) a heating resistor formed on the substrate structure; and (c) an electric conductor formed on the substrate structure and connected electrically to the heating resistor, said substrate structure being an iron alloy containing approximately 5% to 30% chromium by weight and at least one element at a content of approximately 0.05% to 5% by weight, said element being selected from a group of elements including aluminum, silicon, scandium, titanium, vanadium, yttrium, zirconium, niobium, lanthanum, and hafnium, wherein said substrate structure includes an electrical and hat insulating layer formed on the alloy so that the heating resistor and the electric conductor are formed on the electrical and heat insulating layer, and wherein said electrical and heat insulating layer is composed mainly of glass.
Claim 5
Dependent Claim
131 words
A thermal head comprising: (a) a substrate structure; (b) a heating resistor formed on the substrate structure; and (c) an electric conductor formed on the substrate structure and connected electrically to the heating resistor, said substrate structure being an iron alloy containing approximately 5% to 30% chromium by weight and at least one element at a content of approximately 0.05% to 5% by weight, said element being selected from a group of elements including aluminum, silicon, scandium, titanium, vanadium, yttrium, zirconium, niobium, lanthanum, and hafnium, wherein said substrate structure includes an electrical and hat insulating layer formed on the alloy so that the heating resistor and the electric conductor are formed on the electrical and heat insulating layer, and wherein said electrical and heat insulating layer is composed mainly of glass.
Claim 6
Dependent Claim
41 words
The thermal head according to claim 3, wherein said substrate structure includes a metal substrate and a layer of an oxide of the constituent element of the metal, said oxide layer being formed on the main surface of the metal substrate.
Claim 7
Dependent Claim
16 words
The thermal head according to claim 4, wherein said oxide layer is an oxide of spinel.
Claim 8
Dependent Claim
22 words
The thermal head according to claim 3, wherein the thickness of said substrate structure ranges substantially from 0.03 mm to 1 mm.
Claim 9
Dependent Claim
16 words
The thermal head according to claim 3, wherein said glass layer is composed of crystallized glass.
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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) | 1992-05-29 | 1992-11-28 | 1993-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-29 | 1996-11-28 | 1997-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-29 | 2000-11-28 | 2001-05-30 | $7700.00 | Window Closed / Lapsed |