US3814897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal printing head
Assignee: Panasonic Holdings Corp
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Filing: 1972-02-29
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Granted: 1974-06-04
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Expires: 1992-02-29
Abstract
Abstract A thermal printing head comprising a semiconductor body and a heat-generating resistive layer formed by diffusing an impurity into a surface portion of the semiconductor body by any suitable known method. In the thermal printing head, silicon having a low resistivity is employed to form the semiconductor body and an impurity having a conductivity opposite to that of the semiconductor body is employed to form the heat-generating resistive layer so as to completely concentrate current in the resistive layer and attain remarkable improvements in the heat generating characteristic of the thermal printing head.
Inventors
- 👤 H Otani
- 👤 N Yukami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 03:23
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/315; B41J2/32; B41J2/335; B41J2/34
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
163 words
A thermal printing head which generates heat for thermally recording information on a heat sensitive recording medium, comprising: a body of low resistivity semiconductor material having a critical temperature at which a transition to the intrinsic region takes place which is higher than a color producing temperature of said heat sensitive recording medium; a layer of opposite conductivity type from said semiconductor body formed on the surface of said body facing said heat sensitive recording medium, said layer extending over and part way down opposite sides of said body to form a semiconductor junction with said body; an electrically insulating layer covering at least that portion of each side surface of said semiconductor body immediately adjacent to and extending away from said opposite conductivity type layer; and an electrode formed on each said insulating layer and extending onto said opposite conductivity type layer in contact therewith, a heat generating conductivity path being formed through said opposite conductivity type layer between each said electrode.
Claim 2
Dependent Claim
163 words
A thermal printing head which generates heat for thermally recording information on a heat sensitive recording medium, comprising: a body of low resistivity semiconductor material having a critical temperature at which a transition to the intrinsic region takes place which is higher than a color producing temperature of said heat sensitive recording medium; a layer of opposite conductivity type from said semiconductor body formed on the surface of said body facing said heat sensitive recording medium, said layer extending over and part way down opposite sides of said body to form a semiconductor junction with said body; an electrically insulating layer covering at least that portion of each side surface of said semiconductor body immediately adjacent to and extending away from said opposite conductivity type layer; and an electrode formed on each said insulating layer and extending onto said opposite conductivity type layer in contact therewith, a heat generating conductivity path being formed through said opposite conductivity type layer between each said electrode.
Claim 3
Dependent Claim
23 words
A thermal printing head according to clAim 1, wherein each said electrode is disposed in ohmic contact with said opposite conductivity type layer.
Claim 4
Dependent Claim
24 words
A thermal printing head according to claim 2, wherein said opposite conductivity type layer comprises a doped impurity layer diffused into said semiconductor body.
Claim 5
Dependent Claim
70 words
A thermal printing head according to claim 3, further comprising a plurality of said opposite conductivity type layers formed on said surface of said semiconductor body and a plurality of electrodes formed on said insulating layer and in contact with corresponding ones of said plurality of opposite conductivity type layers, each opposite conductivity type layer and its corresponding electrodes being separated from each other opposite conductivity layer and associated electrodes.
Claim 6
Dependent Claim
22 words
A printing head according to claim 4, wherein said body of semiconductive material is composed of one of n-type and p-type materials.
References Cited (Backward Citations)
US3161457A
Cited
US3609659A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |