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US4689642A
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US
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Ink-jet recording head with an elastic ink tank in a sealed casing held at a partial vacuum and having a breakable seal
Assignee: Canon Inc
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Filing: 1985-03-27
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Granted: 1987-08-25
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Expires: 2005-03-27
Abstract
Abstract An ink-jet recording head comprises an ejection element for forming ink droplets, an elastic ink tank for holding therein ink to be supplied to said ejection element, a casing for containing said ink tank therein, and a communication section detachably mounted to the casing capable of communicating a space between said casing and said ink tank with the outside the casing, wherein the space inside the casing is sealed at a pressure lower than atmospheric pressure until the communication section is detached from the casing.
Inventors
- 👤 Hiroshi Sugitani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:34
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/17; B41J2/175; B41J2/17503; B41J2/1752; B41J2/17523; B41J2/17513; G; G01; G01D; G01D15/00; G01D15/16; G01D15/18
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
91 words
An ink-jet recording head comprising: an ejection element for forming ink droplets, an elastic ink tank for holding therein ink to be supplied to said ejection element, a casing containing said ink tank therein and having said ejection element mounted thereto, and communication means, detachably mounted to said casing, capable of communicating a space between said casing and said ink tank with the atmosphere outside said casing, wherein the space inside said casing is sealed at a pressure lower than atmospheric pressure until said communication means is detached from said casing.
Claim 2
Dependent Claim
91 words
An ink-jet recording head comprising: an ejection element for forming ink droplets, an elastic ink tank for holding therein ink to be supplied to said ejection element, a casing containing said ink tank therein and having said ejection element mounted thereto, and communication means, detachably mounted to said casing, capable of communicating a space between said casing and said ink tank with the atmosphere outside said casing, wherein the space inside said casing is sealed at a pressure lower than atmospheric pressure until said communication means is detached from said casing.
Claim 3
Dependent Claim
15 words
A head according to claim 1, wherein said communication means comprises a sealed communication pipe.
Claim 4
Dependent Claim
19 words
A head according to claim 1, wherein said communication means is a portion having less strength than said casing.
Claim 5
Dependent Claim
12 words
A head according to claim 3, wherein said portion comprises a film.
Claim 6
Dependent Claim
12 words
A head according to claim 3, wherein said portion comprises a groove.
Claim 7
Dependent Claim
16 words
A head according to claim 4, wherein said film is a member separate from said casing.
Claim 8
Dependent Claim
23 words
A head according to claim 1, wherein said casing is made of a material selected from the group consisting of resins and metals.
Claim 9
Independent Claim
123 words
A method of storing an ink-jet recording head having an ejection element for forming ink droplets, an elastic ink tank for containing therein ink to be supplied to said ejection element, a casing containing said ink tank therein and having said ejection element mounted thereto and communication means, detachably mounted to said casing, communicating a space between said casing and said ink tank with the atmosphere outside said casing, the method comprising the steps of: maintaining the interior of said casing sealed at a pressure lower than atmospheric pressure before said recording head is used, and communicating the interior of said casing with the atmosphere outside said casing by detaching said communication means from said sealed casing when said recording head is used.
Claim 10
Independent Claim
123 words
A method of storing an ink-jet recording head having an ejection element for forming ink droplets, an elastic ink tank for containing therein ink to be supplied to said ejection element, a casing containing said ink tank therein and having said ejection element mounted thereto and communication means, detachably mounted to said casing, communicating a space between said casing and said ink tank with the atmosphere outside said casing, the method comprising the steps of: maintaining the interior of said casing sealed at a pressure lower than atmospheric pressure before said recording head is used, and communicating the interior of said casing with the atmosphere outside said casing by detaching said communication means from said sealed casing when said recording head is used.
References Cited (Backward Citations)
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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) | 1990-08-24 | 1991-02-23 | 1991-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-24 | 1995-02-23 | 1995-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-24 | 1999-02-23 | 1999-08-25 | $7700.00 | Window Closed / Lapsed |