US4752787A
Expired / Lapsed
US
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Liquid jet recording head
Assignee: Canon Inc
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Filing: 1987-01-13
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Granted: 1988-06-21
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Expires: 2007-01-13
Abstract
Abstract In a liquid jet recording head having a liquid discharging conduit, the ratio of the average cross-sectional area of the conduit at the liquid introducing region to that at the energy actuating region is greater than 1.
Inventors
- 👤 Haruyuki Matsumoto
- 👤 Hiroshi Sugitani
- 👤 Hiroto Matsuda
- 👤 Masakazu Ozawa
- 👤 Masami Ikeda
- 👤 Akira Miyagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:28
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/135; B41J2/16; B41J2/1621; B41J2/164; B41J2/1645; B41J2/14; B41J2/14016; B41J2/14032; B41J2/1404; B41J2/1601; B41J2/1604; B41J2/1623; B41J2/1626; B41J2/1631; B41J2/1632; B41J2/1637; B41J2/1639; B41J2/1646
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
120 words
A liquid jet recording head having a liquid chamber and a liquid discharging conduit with an inlet in direct communication with said liquid chamber for introducing liquid into said liquid discharging conduit along a first flow path, said liquid discharging conduit comprising an energy actuating region for imparting discharging force to a liquid, a liquid introducing region for introducing liquid from said inlet at the liquid chamber side of said conduit to said energy actuating region along the second flow path generally parallel to the first flow path, and a liquid discharging region between said energy actuating region and a liquid discharging outlet, wherein the average cross-sectional area of the conduit decreases substantially monotonically from said inlet to said outlet.
Claim 2
Dependent Claim
120 words
A liquid jet recording head having a liquid chamber and a liquid discharging conduit with an inlet in direct communication with said liquid chamber for introducing liquid into said liquid discharging conduit along a first flow path, said liquid discharging conduit comprising an energy actuating region for imparting discharging force to a liquid, a liquid introducing region for introducing liquid from said inlet at the liquid chamber side of said conduit to said energy actuating region along the second flow path generally parallel to the first flow path, and a liquid discharging region between said energy actuating region and a liquid discharging outlet, wherein the average cross-sectional area of the conduit decreases substantially monotonically from said inlet to said outlet.
Claim 3
Dependent Claim
49 words
A liquid jet recording head according to claim 1, wherein the average cross-sectional area of the conduit at said energy actuating region, S 1 , and the average cross-sectional area of the conduit at said liquid introducing region, S 2 , satisfy the relation, S 2 /S 1 ≧1.3.
Claim 4
Dependent Claim
20 words
A liquid jet recording head according to claim 1, wherein said energy actuating region has a heating element arranged therein.
Claim 5
Dependent Claim
25 words
A liquid jet recording head according to claim 2, wherein S 2 /S 1 defines a value (x) which satisfies the following numerical formula: 10≧x≧1.3.
Claim 6
Dependent Claim
19 words
A liquid jet recording head according to claim 2, wherein a plurality of the liquid discharging conduits are provided.
Claim 7
Dependent Claim
77 words
A liquid jet recording head according to claim 1, wherein said liquid discharging conduit comprises a wall formed of a hardened film of photosensitive resin provided on a surface of a substrate and a liquid chamber, and wherein the average cross-sectional area of the conduit at said energy actuating region, S 1 , and the average cross-sectional area of the conduit at said liquid introducing region, S 2 , satisfy the relation S 2 /S 1 ≧1.3.
Claim 8
Dependent Claim
77 words
A liquid jet recording head according to claim 1, wherein said liquid discharging conduit comprises a wall formed of a hardened film of dry film photoresist provided on a surface of substrate and a liquid chamber, and wherein the average cross-sectional area of the conduit at said energy actuating region, S 1 , and the average cross-sectional area of the conduit at said liquid introducing region, S 2 , satisfy the relation S 2 /S 1 ≧1.3.
Claim 9
Dependent Claim
33 words
A liquid jet recording head according to claim 1, wherein the average cross-sectional area of said conduit decreases with at least one step-decrease and without substantial increase, from said inlet to said outlet.
Claim 10
Dependent Claim
41 words
A liquid jet recording head according to claim 1, wherein the average cross-sectional area of the conduit decreases continuously from a point intermediate said inlet and said energy actuating region to a point intermediate said energy actuating region and said outlet.
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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) | 1991-06-21 | 1991-12-21 | 1992-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-21 | 1995-12-21 | 1996-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-21 | 1999-12-21 | 2000-06-21 | $7700.00 | Window Closed / Lapsed |