US4574292A
Expired / Lapsed
US
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Thermal head
Assignee: Toshiba Corp
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Filing: 1984-11-27
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Granted: 1986-03-04
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Expires: 2004-11-27
Abstract
Abstract In a thermal head having a substrate and a heating resistor of thin film type formed thereon, the heating resistor is a deposited metal oxide film essentially consisting of ruthenium oxide and an oxide of at least one metal M selected from the group consisting of Ca, Sr, Ba, Pb, Bi and Tl. The deposited metal oxide film has an atomic ratio M/Ru of the metal M to ruthenium of 0.6 to 2.
Inventors
- 👤 Osamu Takikawa
- 👤 Mitsuo Harata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:51
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/02; H01C7/021; H10; H10N; H10N97/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
116 words
A thermal head having a substrate, and a heating resistor of thin film type formed thereon: wherein said heating resistor is a deposited metal oxide film consisting essentially of ruthenium oxide and an oxide of at least one metal M selected from the group consisting of calcium, strontium, barium, lead, bismuth and thallium, and containing as a main component at least one metal oxide selected from the group consisting of RuCaO 3 , RuSrO 3 , RuBaO 3 , RuPbO 3 , RuTlO 7/2 and RuBiO 7/2 , said deposited metal oxide film having an atomic ratio M/Ru of the metal M to ruthenium of 0.6 to 2 and a thickness of 1 micron or less.
Claim 2
Dependent Claim
116 words
A thermal head having a substrate, and a heating resistor of thin film type formed thereon: wherein said heating resistor is a deposited metal oxide film consisting essentially of ruthenium oxide and an oxide of at least one metal M selected from the group consisting of calcium, strontium, barium, lead, bismuth and thallium, and containing as a main component at least one metal oxide selected from the group consisting of RuCaO 3 , RuSrO 3 , RuBaO 3 , RuPbO 3 , RuTlO 7/2 and RuBiO 7/2 , said deposited metal oxide film having an atomic ratio M/Ru of the metal M to ruthenium of 0.6 to 2 and a thickness of 1 micron or less.
Claim 3
Dependent Claim
20 words
A thermal head according to claim 1, wherein said atomic ratio M/Ru falls within a range between 0.9 to 1.2.
Claim 4
Dependent Claim
14 words
A thermal head according to claim 2, wherein said atomic ratio M/Ru is 1.
Claim 5
Dependent Claim
22 words
A thermal head according to claim 1, wherein a pair of conductors for supplying electric power is coupled to said heating resistor.
Claim 6
Dependent Claim
32 words
A thermal head according to claim 4, wherein said conductors are formed of a metal or a multilayer metal selected from the group consisting of nickel, titanium, nickel-gold, titanium-gold, titanium-nickel-gold, and titanium-lead-gold.
Claim 7
Dependent Claim
20 words
A thermal head according to claim 1, wherein a protective layer is formed on a surface of said thermal head.
Claim 8
Dependent Claim
15 words
A thermal head according to claim 6, wherein said protective layer consists of aluminum oxide.
Claim 9
Dependent Claim
20 words
A thermal head according to claim 1, wherein a glass glazed layer is formed on a surface of said substrate.
References Cited (Backward Citations)
US4101708A
Cited
US4296309A
Cited
GB2001009A
Cited
FR2397941A1
Cited
US4203025A
Cited
JPS598232A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-03 | 1989-09-02 | 1990-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-03 | 1993-09-02 | 1994-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-03 | 1997-09-02 | 1998-03-04 | $7700.00 | Window Closed / Lapsed |