Patent US4742362A successfully refreshed from Google Patents.
US4742362A
Expired / Lapsed
US
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Thermal head
Assignee: Alps Alpine Co Ltd
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Filing: 1986-10-22
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Granted: 1988-05-03
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Expires: 2006-10-22
Abstract
Abstract In a thermal head in which a heat generating portion is protruded by partially forming a glass glaze layer on an insulating substrate, a protruding portion is formed on the insulating substrate and the glass glaze layer is formed on the protruding portion. The heat generating portion can sufficiently be protruded to render the contact with the recording paper or ink ribbon favorable, thereby improving the heat efficiency.
Inventors
- 👤 Takehiro Takoshima
- 👤 Yoshimi Kamijo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:18
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/315; B41J2/32; B41J2/335; B41J2/33505; B41J2/33525; B41J2/33545; B41J2/33555; B41J2/3357
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
106 words
A thermal head having at least a heat generating resistor layer, a conductor layer, and a protective layer applied successively on an insulating substrate, said heat generating resistor layer being protruded from the insulating substrate in the vicinity of a desired heat generating area by being formed over a two-stage protruding structure formed on the insulating substrate, said two-stage structure comprising a first protruding portion on the insulating substrate made of heat conductive material and spanning the heat generating area, and a smaller, glass glaze layer formed on top of a central part of the first protruding portion and disposed centrally in the heat generating area.
Claim 2
Dependent Claim
106 words
A thermal head having at least a heat generating resistor layer, a conductor layer, and a protective layer applied successively on an insulating substrate, said heat generating resistor layer being protruded from the insulating substrate in the vicinity of a desired heat generating area by being formed over a two-stage protruding structure formed on the insulating substrate, said two-stage structure comprising a first protruding portion on the insulating substrate made of heat conductive material and spanning the heat generating area, and a smaller, glass glaze layer formed on top of a central part of the first protruding portion and disposed centrally in the heat generating area.
Claim 3
Dependent Claim
27 words
A thermal head as defined in claim 1, wherein the protruding extent of the protruding portion formed on the insulating substrate is from 20 to 100 μm.
Claim 4
Dependent Claim
27 words
A thermal head as defined in claim 2, wherein the protruding extent of the protruding portion formed on the insulating substrate is from 50 to 80 μm.
Claim 5
Dependent Claim
28 words
A thermal head as defined in claim 1, wherein the protruding extent of the glass glaze layer formed on the protruding portion is from 10 to 80 μm.
Claim 6
Dependent Claim
28 words
A thermal head as defined in claim 4, wherein the protruding extent of the glass glaze layer formed on the protruding portion is from 20 to 40 μm.
Claim 7
Dependent Claim
23 words
A thermal head as defined in claim 1, wherein the protruding portion is made of an alumina powder and a binder sintered together.
Claim 8
Dependent Claim
37 words
A thermal head as claimed in claim 1 wherein said insulating substrate is an alumina substrate layer, and said protruding portion is a layer of the same material which is curved upwards in the heat generating area.
References Cited (Backward Citations)
JPS52152725A
Cited
US4259564A
Cited
JPS5724275A
Cited
JPS5783476A
Cited
JPS5783477A
Cited
JPS5863475A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-05-03 | 1991-11-02 | 1992-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-03 | 1995-11-02 | 1996-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-03 | 1999-11-02 | 2000-05-03 | $7700.00 | Window Closed / Lapsed |