US4725859A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid jet recording head
Assignee: Canon Inc
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Filing: 1987-01-27
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Granted: 1988-02-16
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Expires: 2007-01-27
Abstract
Abstract A liquid jet recording head comprises an electro-thermal transducer having a heat-generating resistance layer provided on a substrate, a pair of electrodes connected electrically to said heat-generating resistance layer and disposed with a gap so as to confront each other and a heat-generating section provided between these electrodes; a liquid discharging section corresponding to said electro-thermal transducer having an orifice provided for forming flying liquid droplets and a liquid pathway connected to said orifice and having a heat acting portion where heat energy for forming liquid droplets acts on liquid as a part of its constitution; and a liquid chamber for storing said liquid to be supplied to said liquid pathway, which comprises forming said electrodes thinner in the vicinity of at least the portion in contact with said heat-generating section as compared with other portions of the electrodes.
Inventors
- 👤 Makoto Shibata
- 👤 Hiroto Matsuda
- 👤 Masami Ikeda
- 👤 Hiroto Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:30
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/135; B41J2/14; B41J2/14016; B41J2/14088; B41J2/14112; B41J2/14129; B41J2002/14379; B41J2202/00; B41J2202/01; B41J2202/03
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
161 words
A liquid jet recording head, comprising an electro-thermal transducer having a heat-generating resistance layer on a surface of a substrate and a pair of electrodes connected electrically to said heat-generating resistance layer and disposed with a gap so as to confront each other to form a heat-generating section between said electrodes; a liquid discharging section corresponding to said electro-thermal transducer having an orifice for forming liquid droplets and a liquid pathway connected to said orifice and having a heat acting portion in which heat energy for forming liquid droplets acts on liquid in said liquid pathway; and a liquid chamber for storing said liquid to be supplied to said liquid pathway, wherein the upper surface of the electrodes is of steplike shape so that said electrodes, at least in the vicinity of the portion in contact with said heat-generating section, are thinner in the direction substantially normal to said surface of said substrate as compared with other portions of said electrodes.
Claim 2
Dependent Claim
161 words
A liquid jet recording head, comprising an electro-thermal transducer having a heat-generating resistance layer on a surface of a substrate and a pair of electrodes connected electrically to said heat-generating resistance layer and disposed with a gap so as to confront each other to form a heat-generating section between said electrodes; a liquid discharging section corresponding to said electro-thermal transducer having an orifice for forming liquid droplets and a liquid pathway connected to said orifice and having a heat acting portion in which heat energy for forming liquid droplets acts on liquid in said liquid pathway; and a liquid chamber for storing said liquid to be supplied to said liquid pathway, wherein the upper surface of the electrodes is of steplike shape so that said electrodes, at least in the vicinity of the portion in contact with said heat-generating section, are thinner in the direction substantially normal to said surface of said substrate as compared with other portions of said electrodes.
Claim 3
Dependent Claim
18 words
A liquid jet recording head according to claim 1, wherein a protective layer is provided on the electrodes.
Claim 4
Dependent Claim
18 words
A liquid jet recording head according to claim 2, wherein said protective layer includes a plurality of layers.
Claim 5
Dependent Claim
18 words
A liquid jet recording head according to claim 3, wherein the outermost protective layer is a metal layer.
Claim 6
Dependent Claim
16 words
A liquid jet recording head according to claim 2, wherein said protective layer includes a resin.
Claim 7
Dependent Claim
22 words
A liquid jet recording head according to claim 2, wherein said protective layer is formed by plasma polymerization of an organic monomer.
Claim 8
Dependent Claim
17 words
A liquid jet recording head according to claim 2, wherein the protective layer is constituted of polyimidoisoindoloquinazolinedione.
Claim 9
Dependent Claim
20 words
A liquid jet recording heat according to claim 2, wherein the protective layer is constituted of a photosensitive polyimide resin.
Claim 10
Dependent Claim
24 words
A liquid jet recording head according to claim 1, wherein a protective layer is provided on said heat-generating resistance layer of said heat-generating section.
Claim 11
Dependent Claim
18 words
A liquid jet recording head according to claim 9, wherein said protective layer includes a plurality of layers.
Claim 12
Dependent Claim
18 words
A liquid jet recording head according to claim 10, wherein the outermost protective layer is a metal layer.
References Cited (Backward Citations)
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US4345262A
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US4335389A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-02-15 | 1991-08-17 | 1992-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-15 | 1995-08-17 | 1996-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-15 | 1999-08-17 | 2000-02-16 | $7700.00 | Window Closed / Lapsed |