US4045801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ink ejection head for printer
Assignee: Ricoh Co Ltd
•
Filing: 1976-05-26
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Granted: 1977-08-30
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Expires: 1996-05-26
Abstract
Abstract Ink is fed into an ink supply chamber communicating through axially aligned orifices with a pressure chamber and an ejection chamber. An ejection orifice or nozzle opens from the ejection chamber toward a copy sheet for printing. An electrical signal fed to an electrostrictive member defining part of the wall of the pressure chamber causes the volume of the pressure chamber to be reduced thereby ejecting ink out of the ejection orifice. The ejection chamber may also be provided with an electrostrictive member to which the electrical signal is also applied.
Inventors
- 👤 Kyuhachiro Iwasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:07
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/135; B41J2/14; B41J2/14201; B41J2/14298; B41J2002/14387
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
79 words
An ink ejection head defining: an ink ejection chamber; an ink ejection orifice communicating with the ink ejection chamber; an ink supply chamber; an ink supply orifice communicating the ink supply chamber with the ink ejection chamber; an ink inlet communicating with the ink supply chamber; a pressure chamber; and a pressure orifice communicating the pressure chamber with the ink supply chamber; the ink ejection head comprising means for reducing a volume of the pressure chamber for ink ejection.
Claim 2
Dependent Claim
79 words
An ink ejection head defining: an ink ejection chamber; an ink ejection orifice communicating with the ink ejection chamber; an ink supply chamber; an ink supply orifice communicating the ink supply chamber with the ink ejection chamber; an ink inlet communicating with the ink supply chamber; a pressure chamber; and a pressure orifice communicating the pressure chamber with the ink supply chamber; the ink ejection head comprising means for reducing a volume of the pressure chamber for ink ejection.
Claim 3
Dependent Claim
20 words
An ink ejection head as in claim 1 in which the ink supply orifice and the pressure orifice are aligned.
Claim 4
Dependent Claim
26 words
An ink ejection head as in claim 2 in which the ink ejection orifice is axially aligned with the ink supply orifice and the pressure orifice.
Claim 5
Dependent Claim
26 words
An ink ejection head as in claim 2 in which the ink ejection orifice is oriented perpendicular to the ink supply orifice and the pressure orifice.
Claim 6
Dependent Claim
23 words
An ink ejection head as in claim 4 further comprising means for reducing a volume of the ink ejection chamber for ink ejection.
Claim 7
Dependent Claim
16 words
An ink ejection head as in claim 1 in which said means comprises an electrostrictive member.
Claim 8
Dependent Claim
36 words
An ink ejection head as in claim 5 in which said means for reducing the volume of the pressure chamber and said means for reducing the volume of the ink ejection chamber comprise electrostrictive members respectively.
Claim 9
Dependent Claim
25 words
An ink ejection head as in claim 1 in which the ink supply orifice and the pressure orifice are larger than the ink ejection orifice.
References Cited (Backward Citations)
US3747120A
Cited
US3930260A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-29 | 1981-02-28 | 1981-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-29 | 1985-02-28 | 1985-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-29 | 1989-02-28 | 1989-08-30 | $7700.00 | Window Closed / Lapsed |