US4472723A
Expired / Lapsed
US
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Thermal head
Assignee: Oki Electric Industry Co Ltd
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Filing: 1983-08-01
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Granted: 1984-09-18
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Expires: 2003-08-01
Abstract
Abstract A thermal head for high speed printing with high temperature comprises a dielectric substrate, a first thin S i O 2 layer on the substrate, heater layers on the first S i O 2 layer, conductive layers for coupling the heater layer with an external circuit, a second thin S i O 2 layer on the heater layer, and a protection layer on the second S i O 2 layer. The width of the heater layer is less than 30 μm, and the preferable thickness of the first and second S i O 2 layers is less than 2 μm. Preferably, the heater layer is made of tantalium nitride (T a2 N).
Inventors
- 👤 Susumu Shibata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:31
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/315; B41J2/32; B41J2/345
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
99 words
In a thermal head including a dielectric substrate, a plurality of Ta 2 N heater layers each having spaced apart, meandering elongated fingers, conductive layers electrically connected to opposite ends of said Ta 2 N heater layers for providing the electical coupling of said Ta 2 N heater layers with external electronic circuitry, and a protection layer, characterized in that: a pair of SiO 2 insulating layers enclose said conductive layers and said Ta 2 N heater layers wherein the width of each of said Ta 2 N heater layers between said conducting layers is less than 30 μm.
Claim 2
Dependent Claim
99 words
In a thermal head including a dielectric substrate, a plurality of Ta 2 N heater layers each having spaced apart, meandering elongated fingers, conductive layers electrically connected to opposite ends of said Ta 2 N heater layers for providing the electical coupling of said Ta 2 N heater layers with external electronic circuitry, and a protection layer, characterized in that: a pair of SiO 2 insulating layers enclose said conductive layers and said Ta 2 N heater layers wherein the width of each of said Ta 2 N heater layers between said conducting layers is less than 30 μm.
Claim 3
Dependent Claim
16 words
A thermal head according to claim 1, wherein said heater layer is made of tantalium nitride.
Claim 4
Dependent Claim
19 words
A thermal head according to claim 1, wherein said finger of the heater layers is in a tortuous configuration.
Claim 5
Dependent Claim
31 words
The thermal head of claim 1 in which said meandering, elongated fingers are each separated by a slit to produce separated finger portions each having a width less than 30 μm.
Claim 6
Dependent Claim
17 words
The thermal head of claim 1 in which the resistivity of the heater material is 17 ohms/square.
Claim 7
Dependent Claim
17 words
The terminal head of claim 1 in which said protection layer is Ta 2 O 5 .
Claim 8
Dependent Claim
98 words
In a thermal head including a dielectric substrate, a plurality of Ta 2 N heater layers each having spaced apart, meandering elongated fingers, conductive layers electrically connected to opposite ends of said Ta 2 N heater layers for providing the electrical coupling of said Ta 2 N heater layers with external electronic circuitry, and a protection layer, characterized in that: said meandering, elongated fingers are each separated by a slit to produce separated finger portions each having a width less than 30 μm, and a pair of SiO 2 insulating layers enclose said Ta 2 N heater layers.
Claim 9
Dependent Claim
98 words
In a thermal head including a dielectric substrate, a plurality of Ta 2 N heater layers each having spaced apart, meandering elongated fingers, conductive layers electrically connected to opposite ends of said Ta 2 N heater layers for providing the electrical coupling of said Ta 2 N heater layers with external electronic circuitry, and a protection layer, characterized in that: said meandering, elongated fingers are each separated by a slit to produce separated finger portions each having a width less than 30 μm, and a pair of SiO 2 insulating layers enclose said Ta 2 N heater layers.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-18 | 1988-03-19 | 1988-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-18 | 1992-03-19 | 1992-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-18 | 1996-03-19 | 1996-09-18 | $7700.00 | Window Closed / Lapsed |