US4034187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal printing head
Assignee: Panasonic Holdings Corp
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Filing: 1975-09-15
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Granted: 1977-07-05
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Expires: 1995-09-15
Abstract
Abstract A thermal printing head of the planar type which comprises a silicon substrate, a plurality of heat-generating elements provided in the silicon substrate and a heat-insulation layer of silicon dioxide which is provided around each heat-generating element. The heat-insulation layer of silicon dioxide has an excellent heat-insulation characteristic, so that heat which is generated from the heat-generating elements is prevented from flowing to neighboring heat-generating elements whereby distinct patterns can be printed on a thermosensitive paper.
Inventors
- 👤 Tatsuyuki Tomioka
- 👤 Noboru Yukami
- 👤 Yoshi Hamaguchi
- 👤 Kiyoharu Yamashita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:43
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/315; B41J2/32; B41J2/335; B41J2/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
A thermal printing head of the silicon planar type which comprises a silicon substrate having a generally flat substantially unbroken surface for being brought into contact with a thermosensitive paper; a plurality of heat-generating layer elements which are provided in the silicon substrate, each heat-generating layer having an electrical resistivity; heat-insulation portions of silicon dioxide extending through the thickness of the substrate around each heat-generating layer element whereby the domains surrounded by the heat-insulation portions constitute heat-generating elements, the heat-insulation portions preventing heat which is generated from the heat-generating elements; and a plurality of electrodes connected to the heat-generating elements for energizing them.
Claim 2
Dependent Claim
103 words
A thermal printing head of the silicon planar type which comprises a silicon substrate having a generally flat substantially unbroken surface for being brought into contact with a thermosensitive paper; a plurality of heat-generating layer elements which are provided in the silicon substrate, each heat-generating layer having an electrical resistivity; heat-insulation portions of silicon dioxide extending through the thickness of the substrate around each heat-generating layer element whereby the domains surrounded by the heat-insulation portions constitute heat-generating elements, the heat-insulation portions preventing heat which is generated from the heat-generating elements; and a plurality of electrodes connected to the heat-generating elements for energizing them.
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) | 1980-07-04 | 1981-01-03 | 1981-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-04 | 1985-01-03 | 1985-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-04 | 1989-01-03 | 1989-07-05 | $7700.00 | Window Closed / Lapsed |