Patent US4626875A successfully refreshed from Google Patents.
US4626875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for liquid-jet recording wherein a potential is applied to the liquid
Assignee: Canon Inc
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Filing: 1984-09-21
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Granted: 1986-12-02
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Expires: 2004-09-21
Abstract
Abstract An apparatus for liquid-jet recording having heat-generating means and means for jetting a liquid utilizing an energy generated by the heat-generating means comprises an electrode provided in contact with the liquid in impart a potential to the liquid lower than the potential used to generate heat.
Inventors
- 👤 Toshitami Hara
- 👤 Hisanori Tsuda
- 👤 Shinichi Hirasawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:55
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/135; B41J2/14; B41J2/14016; B41J2/14088; B41J2/14112; B41J2/14129
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
78 words
A liquid-jet recording head comprising: heat-generating means for generating heat energy to jet liquid, said heat-generating means including a heat-generating resistor and at least one pair of electrodes electrically connected to said heat-generating resistor for applying a predetermined voltage to said heat-generating resistor; a protective film provided on said heat-generating means; and a third electrode provided in contact with the liquid for applying a voltage to the liquid lower than the predetermined voltage applied to said heat-generating resistor.
Claim 2
Dependent Claim
78 words
A liquid-jet recording head comprising: heat-generating means for generating heat energy to jet liquid, said heat-generating means including a heat-generating resistor and at least one pair of electrodes electrically connected to said heat-generating resistor for applying a predetermined voltage to said heat-generating resistor; a protective film provided on said heat-generating means; and a third electrode provided in contact with the liquid for applying a voltage to the liquid lower than the predetermined voltage applied to said heat-generating resistor.
Claim 3
Dependent Claim
16 words
An apparatus according to claim 1, wherein said third electrode is provided in a liquid passage.
Claim 4
Dependent Claim
19 words
An apparatus according to claim 1, wherein said third electrode is provided on a wall of a liquid passage.
Claim 5
Dependent Claim
21 words
An apparatus according to claim 1, wherein said third electrode is an orifice plate having an orifice for jetting the liquid.
Claim 6
Dependent Claim
19 words
An apparatus according to claim 1, wherein said heat-generating resistor contains 30 atomic % or more of tantalum Ta.
Claim 7
Dependent Claim
29 words
An apparatus according to claim 1, wherein the liquid is jetted by rapid growth and contraction of bubbles generated in the liquid by the energy imparted to the liquid.
Claim 8
Independent Claim
93 words
An apparatus for liquid-jet recording comprising: heat-generating means for generating heat energy to jet liquid, said heat-generating means including a heat-generating resistor and at least one pair of electrodes electrically connected to said heat-generating resistor for applying a voltage Vh to said heat-generating resistor; a protective film provided on said heat generating means; a third electrode provided in contact with the liquid for applying a voltage V ink to the liquid lower than the voltage Vh applied to said heat-generating resistor; and a power source for supplying a voltage to said third electrode.
Claim 9
Independent Claim
93 words
An apparatus for liquid-jet recording comprising: heat-generating means for generating heat energy to jet liquid, said heat-generating means including a heat-generating resistor and at least one pair of electrodes electrically connected to said heat-generating resistor for applying a voltage Vh to said heat-generating resistor; a protective film provided on said heat generating means; a third electrode provided in contact with the liquid for applying a voltage V ink to the liquid lower than the voltage Vh applied to said heat-generating resistor; and a power source for supplying a voltage to said third electrode.
Claim 10
Dependent Claim
16 words
An apparatus according to claim 7, wherein said third electrode is provided in a liquid passage.
Claim 11
Dependent Claim
18 words
An apparatus according to claim 7, whrein said third electrode is provided on a wall of liquid passage.
Claim 12
Dependent Claim
18 words
An apparatus according to claim 7, wherein said third electrode is provided in a tank containing the liquid.
Claim 13
Dependent Claim
21 words
An apparatus according to claim 7, wherein said third electrode is an orifice plate having an orifice for jetting the liquid.
Claim 14
Dependent Claim
19 words
An apparatus according to claim 7, wherein said third electrode is a liquid supply pipe for supplying the liquid.
Claim 15
Dependent Claim
22 words
An apparatus according to claim 7, wherein said third electrode is provided between a liquid passage and a tank containing the liquid.
Claim 16
Dependent Claim
19 words
An apparatus according to claim 7, wherein said heat-generating resistor contains 30 atomic % or more of tantalum Ta.
Claim 17
Dependent Claim
29 words
An apparatus according to claim 7, wherein the liquid is jetted by rapid growth and contraction of bubbles generated in the liquid by the energy imparted to the liquid.
Claim 18
Dependent Claim
107 words
Liquid-jet recording apparatus comprising: heat-generating means for generating heat energy to jet liquid, said heat-generating means including a heat-generating resistor, at least one pair of electrodes electrically connected to said heat-generating resistor for applying a voltage Vh to said heat-generating resistor, and a protective film provided on the heat-generating means; a third electrode provided in contact with the liquid for applying a voltage V ink to the liquid lower than the voltage Vh applied to said heat-generating resistor; and a power source for supplying the voltage V ink in a range given by the following formula: Vg-A(Vh-Vg)<V.sub.ink <Vg+A(Vh-Vg) wherein Vg is ground voltage and A is 0.5.
Claim 19
Dependent Claim
107 words
Liquid-jet recording apparatus comprising: heat-generating means for generating heat energy to jet liquid, said heat-generating means including a heat-generating resistor, at least one pair of electrodes electrically connected to said heat-generating resistor for applying a voltage Vh to said heat-generating resistor, and a protective film provided on the heat-generating means; a third electrode provided in contact with the liquid for applying a voltage V ink to the liquid lower than the voltage Vh applied to said heat-generating resistor; and a power source for supplying the voltage V ink in a range given by the following formula: Vg-A(Vh-Vg)<V.sub.ink <Vg+A(Vh-Vg) wherein Vg is ground voltage and A is 0.5.
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) | 1989-12-01 | 1990-06-02 | 1990-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-01 | 1994-06-02 | 1994-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-01 | 1998-06-02 | 1998-12-02 | $7700.00 | Window Closed / Lapsed |