US4038516A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal printing head
Assignee: Facit AB
•
Filing: 1975-02-20
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Granted: 1977-07-26
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Expires: 1995-02-20
Abstract
Abstract A thermal printing head provided with a plurality of electric heating members for recording information on a recording material, such as heat-sensitive paper. The heating members are voltage-dependent resistive elements and are mounted on a support member in the form of a substrate. Means are provided for the selective supply of current to one or several of the elements. At least some of the elements are constituted of silicon carbide.
Inventors
- 👤 Bengt Allan Bergvall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:44
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/315; B41J2/32; B41J2/345
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
71 words
A thermal printing head comprising a plurality of electric heating elements for recording information on a recording medium, a support member mounting said heating elements, said heating elements being varistor elements, said varistor elements each comprising a series combination of an element having non-linear current-voltage characteristics and a resistor having linear current-voltage characteristics, and means for the selective supply of the electric current to at least one of said varistor elements.
Claim 2
Dependent Claim
71 words
A thermal printing head comprising a plurality of electric heating elements for recording information on a recording medium, a support member mounting said heating elements, said heating elements being varistor elements, said varistor elements each comprising a series combination of an element having non-linear current-voltage characteristics and a resistor having linear current-voltage characteristics, and means for the selective supply of the electric current to at least one of said varistor elements.
Claim 3
Dependent Claim
18 words
The thermal printing head as claimed in claim 1 wherein said recording medium is a heat-sensitive recording material.
Claim 4
Dependent Claim
30 words
The thermal printing head as claimed in claim 1 wherein the current-voltage characteristic of each varistor element is such that its resistivity is high at low voltages on the element.
Claim 5
Dependent Claim
25 words
The thermal printing head as claimed in claim 1 wherein a layer of wear protection is applied on the exterior surface of each varistor element.
Claim 6
Dependent Claim
17 words
The thermal printing head of claim 1 wherein said resistors having non-linear current-voltage characteristics comprise silicon-carbide elements.
Claim 7
Dependent Claim
29 words
The thermal printing head as claimed in claim 1 wherein said support member is a substrate, and the varistor elements are thick-film elements that are applied on said substrate.
Claim 8
Dependent Claim
21 words
The thermal printing head as claimed in claim 6 wherein said thick-film elements are formed by paste applied on the substrate.
Claim 9
Dependent Claim
18 words
The thermal printing head as claimed in claim 7 wherein said paste on said substrate is heat treated.
Claim 10
Dependent Claim
19 words
The thermal printing head as claimed in claim 6 wherein said paste is at least partly constituted of silicon-carbide.
References Cited (Backward Citations)
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Cited
US3515850A
Cited
US3509072A
Cited
US3825722A
Cited
US3833789A
Cited
US3805022A
Cited
US3965330A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |