US4296309A
Expired / Lapsed
US
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Thermal head
Assignee: Canon Inc
•
Filing: 1978-05-15
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Granted: 1981-10-20
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Expires: 1998-05-15
Abstract
Abstract A thermal head of the present invention is composed of a substrate, a resistive heater element formed on the substrate, and electrically conductive members to supply electric power to the resistive heater element, wherein the resistive heater element contains a metal boride as the principal constituent. The thermal head of this construction is capable of selecting its resistivity to a high value and causing a large electric current to flow in the form of short pulses for the purpose of high speed printing, hence it is stable against repetitive pulse applications over a long period of time.
Inventors
- 👤 Akira Shinmi
- 👤 Masahisa Fukui
- 👤 Toshitami Hara
- 👤 Yoshiaki Shirato
- 👤 Yoshioki Hajimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:52
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/10; H05B3/12; H01; H01C; H01C7/00; H01C7/006; H10; H10N; H10N97/00
Claims Analysis
Total Claims: 39
Claim 1
Independent Claim
61 words
A thermal head comprising means for producing a pattern on a recording medium in accordance with information to be recorded, said means including a substrate, a thin film resistive heater element overlying the substrate, and electrically conductive members overlying the resistive heater element for supplying the resistive heater element with electric power, wherein the resistive heater element comprises a metal boride.
Claim 2
Dependent Claim
61 words
A thermal head comprising means for producing a pattern on a recording medium in accordance with information to be recorded, said means including a substrate, a thin film resistive heater element overlying the substrate, and electrically conductive members overlying the resistive heater element for supplying the resistive heater element with electric power, wherein the resistive heater element comprises a metal boride.
Claim 3
Dependent Claim
42 words
A thermal head according to claim 1 in which the metal boride is selected from the group consisting of hafnium boride, zirconium boride, lanthanum boride, tantalum boride, vanadium boride, niobium boride, tungsten boride, chromium boride, titanium boride, molybdenum boride and mixtures thereof.
Claim 4
Dependent Claim
23 words
A thermal head according to claim 1 in which the resistive heater element comprises a metal boride and oxygen in an atomic form.
Claim 5
Dependent Claim
32 words
A thermal head according to claim 3 in which the atomic ratio of oxygen to the metal of the metal boride except boron in the resistive heater element is at least 0.005.
Claim 6
Dependent Claim
37 words
A thermal head according to claim 3 in which the atomic ratio of oxygen to the metal of the metal boride except boron in the resistive heater element is in the range of from 0.01 to 1.0.
Claim 7
Dependent Claim
71 words
A thermal head comprising means for producing a pattern on a recording medium in accordance with information to be recorded, said means including a substrate, a thin film resistive heater element overlying the substrate, and electrically conductive members overlying the resistive heater element for supplying the resistive heater element with electric power, wherein the resistive heater element comprises a metal boride and a metal other than that constituting the metal boride.
Claim 8
Dependent Claim
71 words
A thermal head comprising means for producing a pattern on a recording medium in accordance with information to be recorded, said means including a substrate, a thin film resistive heater element overlying the substrate, and electrically conductive members overlying the resistive heater element for supplying the resistive heater element with electric power, wherein the resistive heater element comprises a metal boride and a metal other than that constituting the metal boride.
Claim 9
Dependent Claim
47 words
A thermal head according to claim 6 in which the metal is at least one member selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Cu, Ag, Au, Mn, Fe, Co, Ni, Pt, Rh, Pd, Os, Ir, Ru, and lanthanide series.
Claim 10
Dependent Claim
25 words
A thermal head according to claim 1 in which the resistive heater element is covered with a film containing silicon dioxide as the main component.
Claim 11
Dependent Claim
20 words
A thermal head according to claim 1 in which a protecting film of tantalum oxide covers the resistive heater element.
Claim 12
Dependent Claim
20 words
A thermal head according to claim 1 in which a protecting film of aluminum oxide covers the resistive heater element.
Claim 13
Dependent Claim
20 words
A thermal head according to claim 1 in which a protecting film of magnesium oxide covers the resistive heater element.
Claim 14
Dependent Claim
20 words
A thermal head according to claim 1 in which a protecting film of zirconium oxide covers the resistive heater element.
Claim 15
Dependent Claim
21 words
A thermal head according to claim 8 in which a protecting film of tantalum oxide covers the film of silicon dioxide.
Claim 16
Dependent Claim
21 words
A thermal head according to claim 8 in which a protecting film of aluminum oxide covers the film of silicon dioxide.
Claim 17
Dependent Claim
21 words
A thermal head according to claim 8 in which a protecting film of magnesium oxide covers the film of silicon dioxide.
Claim 18
Dependent Claim
21 words
A thermal head according to claim 8 in which a protecting film of zirconium oxide covers the film of silicon dioxide.
Claim 19
Dependent Claim
26 words
A thermal head according to claim 1 in which a titanium-containing layer is present between the resistive heater element and at least one electrically conductive member.
Claim 20
Dependent Claim
21 words
A thermal head according to claim 17 in which the titanium-containing layer is between 5 A and 1000 A in thickness.
Claim 21
Dependent Claim
26 words
A thermal head according to claim 1 in which a vanadium-containing layer is present between the resistive heater element and at least one electrically conductive member.
Claim 22
Dependent Claim
21 words
A thermal head according to claim 19 in which the vanadium-containing layer is between 5 A and 1000 A in thickness.
Claim 23
Dependent Claim
20 words
A thermal head according to claim 1 in which the substrate is a ceramic layer of 0.2-0.5 mm. in thickness.
Claim 24
Dependent Claim
70 words
A thermal head according to claim 1 in which the substrate is composed of a glazed substrate and a low alkali glass layer interposed between the glazed substrate and the resistive heater element and essentially consisting of a low alkali glass having a softening point of at least 745° C. and containing not more than 1.0% by weight of sodium oxide and potassium oxide based on the low alkali glass.
Claim 25
Dependent Claim
19 words
A thermal head according to claim 22 in which the low alkali glass layer is 0.2-50 μm in thickness.
Claim 26
Dependent Claim
31 words
A thermal head according to claim 1 in which the substrate is composed of a glazed substrate and a quartz layer interposed between the glazed substrate and the resistive heater element.
Claim 27
Dependent Claim
17 words
A thermal head according to claim 24 in which the quartz layer is 0.2-50 μm in thickness.
Claim 28
Dependent Claim
47 words
A thermal head according to claim 1 in which the substrate is composed of a layer composed of a material having a good thermal conductivity and a quartz layer interposed between the layer composed of a material having a good thermal conductivity and the resistive heater element.
Claim 29
Dependent Claim
17 words
A thermal head according to claim 26 in which the quartz layer is 1-90 μm in thickness.
Claim 30
Dependent Claim
54 words
A thermal head comprising a substrate, a thin film resistive heater element overlying the substrate, and electrically conductive members overlying the resistive heater element for supplying the resistive heater element with electric power, wherein the resistive heater element comprises a metal boride, and a semiconductor selected from the group consisting of Si and Ge.
Claim 31
Dependent Claim
54 words
A thermal head comprising a substrate, a thin film resistive heater element overlying the substrate, and electrically conductive members overlying the resistive heater element for supplying the resistive heater element with electric power, wherein the resistive heater element comprises a metal boride, and a semiconductor selected from the group consisting of Si and Ge.
Claim 32
Dependent Claim
34 words
A thermal head according to claim 1 in which the substrate is composed of a glazed substrate essentially consisting of a material of a good thermal conductivity, and a glass layer covering the material.
Claim 33
Dependent Claim
75 words
A thermal head according to claim 1 in which the substrate is composed of a material having a good thermal conductivity and a low alkali glass layer overlying the layer composed of a material having a good thermal conductivity and essentially consisting of a low alkali glass having a softening point of at least 745° C. and containing not more than 1.0% by weight sodium oxide and potassium oxide based on the low alkali glass.
Claim 34
Dependent Claim
19 words
A thermal head according to claim 30 in which the low alkali glass layer is 1-90 μm in thickness.
Claim 35
Dependent Claim
19 words
A thermal head according to claim 1 in which the thin film resistive heater element is formed by sputtering.
Claim 36
Dependent Claim
21 words
A thermal head according to claim 1 in which the thin film resistive heater element is formed by electron beam deposition.
Claim 37
Dependent Claim
27 words
A thermal head according to claim 32 or 33 in which oxygen is present in the atmosphere used in formation of the thin film resistive heater element.
Claim 38
Dependent Claim
19 words
A thermal head according to claim 28, wherein said resistive heater element further comprises oxygen in an atomic form.
Claim 39
Dependent Claim
24 words
A thermal head according to claim 1, wherein said means includes a plurality of resistive heater elements each provided with corresponding electrically conductive members.
References Cited (Backward Citations)
CA715691A
Cited
US3240625A
Cited
US3503801A
Cited
US3931492A
Cited
US4073971A
Cited
US3973106A
Cited
US4007352A
Cited
US4129848A
Cited
US4017712A
Cited
US4038517A
Cited
US4136274A
Cited
US4194108A
Cited
US4169032A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-19 | 1985-04-20 | 1985-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-19 | 1989-04-20 | 1989-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-19 | 1993-04-20 | 1993-10-20 | $7700.00 | Window Closed / Lapsed |