US4536097A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piezoelectrically operated print head with channel matrix and method of manufacture
Assignee: Siemens AG
•
Filing: 1984-02-14
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Granted: 1985-08-20
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Expires: 2004-02-14
Abstract
Abstract A mechanically stable, piezoelectric print head for an ink jet printer has ink channels formed by a channel matrix that consists of a row of piezoelectric strips disposed in spaced parallel relation next to one another, covered by a plate on both sides. The channels thus formed directly institute the printing nozzles.
Inventors
- 👤 Kenth Nilsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:55
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/135; B41J2/14; B41J2/14201; B41J2/14209; B41J2/145; B41J2/155; B41J2002/14379; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49401
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
95 words
A piezoelectrically operated print head for a dot matrix comprising; printing nozzles in the form of ink channels each having drive elements, said channels accepting writing fluid from which the writing fluid is ejected drop-by-drop due to piezoelectric deformation of its drive element, said ink channels being formed as a channel matrix that consists of at least one series of strips of piezoelectric material that are disposed parallel to one another at spaced intervals, and including means for electrically contacting said piezoelectric material at both sides, and means for covering said strips at both sides.
Claim 2
Dependent Claim
95 words
A piezoelectrically operated print head for a dot matrix comprising; printing nozzles in the form of ink channels each having drive elements, said channels accepting writing fluid from which the writing fluid is ejected drop-by-drop due to piezoelectric deformation of its drive element, said ink channels being formed as a channel matrix that consists of at least one series of strips of piezoelectric material that are disposed parallel to one another at spaced intervals, and including means for electrically contacting said piezoelectric material at both sides, and means for covering said strips at both sides.
Claim 3
Dependent Claim
51 words
A print head as claimed in claim 1, wherein the thickness of the strips and their mutual spacing are selected so that the channels located between the strips directly form the printing nozzles, whereby writing fluid is ejected directly from said channels in response to electrical excitation of said piezoelectric material.
Claim 4
Dependent Claim
19 words
A print head as claimed in claim 1, wherein only every second channel is employed as a printing nozzle.
Claim 5
Dependent Claim
31 words
A print head as claimed in claim 1, wherein the plate at one side of the piezoelectric strips consists of metal and serves as a shared electrode for all said strips.
Claim 6
Dependent Claim
26 words
A print head as claimed in claim 4, wherein at least this plate is so thin that the deformation of the piezoelectric strips causes no bending.
Claim 7
Dependent Claim
22 words
A print head as claimed in claim 1, wherein the piezoelectric strips are provided with a metal layer at their upper side.
Claim 8
Dependent Claim
23 words
A print head as claimed in claim 1, wherein the height of the ink channels decreases in the region of the discharge opening.
Claim 9
Independent Claim
64 words
A method for manufacturing a print head including the steps of providing a carrier plate having a conductive layer on one surface, applying piezoelectric material to said conductive layer in strips, providing electrical contacts for contacting said piezoelectric strips in pairs, and providing an insulating plate for covering the side of said strips opposite said carrier plate for forming a plurality of closed channels.
Claim 10
Independent Claim
64 words
A method for manufacturing a print head including the steps of providing a carrier plate having a conductive layer on one surface, applying piezoelectric material to said conductive layer in strips, providing electrical contacts for contacting said piezoelectric strips in pairs, and providing an insulating plate for covering the side of said strips opposite said carrier plate for forming a plurality of closed channels.
Claim 11
Dependent Claim
48 words
The method for manufacturing a print head as claimed in claim 8, including the step of providing a bilaminar plate of carrier material and piezoelectric material for said carrier plate and said strips, the strip structure of said piezoelectric material being generated by selective removal of piezoelectric material.
Claim 12
Dependent Claim
17 words
The method as claimed in claim 8, including the step of providing metal as the carrier material.
Claim 13
Dependent Claim
64 words
The method for manufacturing a print head as claimed in claim 8, including the step of forming a laminate of piezoelectric material with a metal coating on both sides, cutting strips extending over approximately two layers alternately from the laminate on alternate sides and electrically contacting the remaining strips of piezoelectric material in pairs, and providing a cover plate in at least one side.
Claim 14
Dependent Claim
30 words
The method for manufacturing a write head as claimed in claim 11, including the step of breaking the piezoelectric material at least once in the longitudinal direction of said strips.
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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) | 1988-08-19 | 1989-02-18 | 1989-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-19 | 1993-02-18 | 1993-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-19 | 1997-02-18 | 1997-08-20 | $7700.00 | Window Closed / Lapsed |