US4709243A
Expired / Lapsed
US
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Thermal head and method for manufacture thereof
Assignee: Alps Alpine Co Ltd
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Filing: 1985-10-23
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Granted: 1987-11-24
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Expires: 2005-10-23
Abstract
Abstract A thermal head having a heat-generating resistor layer, a power feeding conductor layer, and a protective layer superposed on an electrically insulating layer, acquires improved quality by forming the heat-generating resistor layer with an alloy consisting of tantalum, a high-melting metal, and nitrogen. The thermal head of improved quality is produced by spattering a composite target consisting of tantalum and the high-melting metal in a mixed gas consisting of nitrogen and argon. The high-melting metal is at least one member selected from the group consisting of titanium, zirconium, hafnium, vanadium, niobium, chromium, molybdenum, and tungsten.
Inventors
- 👤 Masakazu Kato
- 👤 Takehiro Takoshima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:54
CPC Classifications
H; H10; H10N; H10N97/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
45 words
A thermal head having a heat-generating resistor layer, a power feeding conductor layer, and a protective layer superposed on an electrically insulating layer, characterized by the fact that said heat-generating resistor layer is formed of ternary alloy consisting of tantalum, a high-melting metal, and nitrogen.
Claim 2
Dependent Claim
45 words
A thermal head having a heat-generating resistor layer, a power feeding conductor layer, and a protective layer superposed on an electrically insulating layer, characterized by the fact that said heat-generating resistor layer is formed of ternary alloy consisting of tantalum, a high-melting metal, and nitrogen.
Claim 3
Dependent Claim
31 words
A thermal head according to claim 1, wherein said high-melting metal is at least one metal selected from the group consisting of titanium, zirconium, halnium, vanadium, niobium, chromium, molybdenum, and tungsten.
Claim 4
Dependent Claim
53 words
A thermal head according to claim 1, wherein the content of tantalum is controlled in the range of 10 to 80 atom %, the content of said high-melting metal in the range of 5 to 60 atom %, and the content of nitrogen in the range of 10 to 60 atom % respectively.
Claim 5
Dependent Claim
53 words
A thermal head according to claim 2, wherein the content of tantalum is controlled in the range of 10 to 80 atom %, the content of said high-melting metal in the range of 5 to 60 atom %, and the content of nitrogen in the range of 10 to 60 atom % respectively.
References Cited (Backward Citations)
US4232213A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-11-23 | 1991-05-25 | 1991-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-23 | 1995-05-25 | 1995-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-23 | 1999-05-25 | 1999-11-24 | $7700.00 | Window Closed / Lapsed |