US4595823A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal printing head with an anti-abrasion layer and method of fabricating the same
Assignee: Fujitsu Ltd
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Filing: 1984-03-19
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Granted: 1986-06-17
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Expires: 2004-03-19
Abstract
Abstract Cracks in an Ta 2 O 5 anti-abrasion layer of a thermal printing head resulting from the crystallization of the Ta 2 O 5 in the layer, are suppressed by the addition of SiO 2 to the layer. The anti-abrasion layer is provided as a uniform mixture of Ta 2 O 5 and SiO 2 throughout the layer by sputtering a target composed of a mixture containing tantalum and silicon ingredients onto an antioxidation layer. The thermal printing head is also subjected to annealing to stabilize the resistivity of the heating elements.
Inventors
- 👤 Haruo Sorimachi
- 👤 Kiyoshi Satoh
- 👤 Takumi Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:51
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/315; B41J2/32; B41J2/335; B41J2/33505; B41J2/3353; B41J2/3355; B41J2/33555; B41J2/3357
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
59 words
A thermal printing head, comprising: a substrate; heating elements formed on said substrate; conductors formed on and contacting said heating elements; an anti-oxidation layer covering said heating elements and said conductors; and an anti-abrasion layer formed over said anti-oxidation layer, said anti-abrasion layer comprising a uniform mixture of a tantalum pentaoxide anti-abrasion compound and a silicon dioxide anti-crystallization compound.
Claim 2
Dependent Claim
59 words
A thermal printing head, comprising: a substrate; heating elements formed on said substrate; conductors formed on and contacting said heating elements; an anti-oxidation layer covering said heating elements and said conductors; and an anti-abrasion layer formed over said anti-oxidation layer, said anti-abrasion layer comprising a uniform mixture of a tantalum pentaoxide anti-abrasion compound and a silicon dioxide anti-crystallization compound.
Claim 3
Dependent Claim
27 words
A thermal printing head as recited in claim 1, wherein content of said tantalum pentaoxide in said anti-abrasion layer is more than sixty percent in mol ratio.
Claim 4
Dependent Claim
27 words
A thermal printing head as recited in claim 1, wherein content of said silicon dioxide in said anti-abrasion layer is less than forty percent in mol ratio.
Claim 5
Dependent Claim
31 words
A thermal printing head as recited in claim 1, wherein content of said silicon dioxide in said anti-abrasion layer is in a range from ten through thirty percent in mol ratio.
Claim 6
Dependent Claim
27 words
A thermal printing head as recited in claim 1, wherein said anti-oxidation layer is selected from a group consisting of silicon dioxide, silicon oxynitride and silicon nitride.
Claim 7
Dependent Claim
52 words
A thermal printing head, comprising: a substrate; a heating element formed on said substrate; conductors formed on and contacting said heating element; and an anti-abrasion layer formed over said heating element and said conductors, said anti-abrasion layer comprising a uniform mixture throughout its thickness of an anti-abrasion compound and an anti-crystallization compound.
Claim 8
Dependent Claim
52 words
A thermal printing head, comprising: a substrate; a heating element formed on said substrate; conductors formed on and contacting said heating element; and an anti-abrasion layer formed over said heating element and said conductors, said anti-abrasion layer comprising a uniform mixture throughout its thickness of an anti-abrasion compound and an anti-crystallization compound.
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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) | 1989-06-16 | 1989-12-16 | 1990-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-16 | 1993-12-16 | 1994-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-16 | 1997-12-16 | 1998-06-17 | $7700.00 | Window Closed / Lapsed |