Patent US4445197A successfully refreshed from Google Patents.
Patent US4438441A successfully refreshed from Google Patents.
US4438441A
Expired / Lapsed
US
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Mosaic recorder with improved transducer
Assignee: Siemens AG
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Filing: 1982-03-25
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Granted: 1984-03-20
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Expires: 2002-03-25
Abstract
Abstract A mosaic recorder for selectively ejecting recording liquid droplets from a plurality of nozzles in a recording head onto a moving recording medium for punctiform representation of characters and images has a plurality of piezoelectric transducers respectively associated with each nozzle which are individually actuated for ejecting a droplet from the associated nozzle. The individual transducers are in the form of teeth of a comb-like bilaminar piezoplate consisting of piezoceramic material and a carrier material. The piezo material is removed from portions of the free ends of the transducer teeth which overlie the nozzles for reducing the hydraulic coupling between the teeth in order to substantially minimize cross-talk between an activated transducer tooth and the adjacent transducer teeth.
Inventors
- 👤 Jan Bolmgren
- 👤 Kenth Nilsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:12
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/135; B41J2/14; B41J2/14201; B41J2/14282; B41J2/145; B41J2/155; B41J2002/14387
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
139 words
In a mosaic recorder having a recording head with a plurality of nozzles disposed in rows for ejecting droplets of recording liquid for printing alphanumeric characters and images in punctiform representation, each nozzle having a piezoelectric transducer associated therewith having a movable free end for forcing said recording liquid through said nozzles upon selected activation of said transducers, the improvement comprising a bilaminar comb-like piezoplate having a plurality of teeth forming said transducers, said plate having a carrier layer adjacent to said recording head and a piezoceramic layer, said piezoceramic layer for each of said transducer teeth terminating a distance from said free end of said transducer such that a fraction of said transducers respectively overlying said nozzles consists solely of exposed carrier layer, said fraction of said transducers being lighter and thinner than a remainder of said piezoplate.
Claim 2
Dependent Claim
139 words
In a mosaic recorder having a recording head with a plurality of nozzles disposed in rows for ejecting droplets of recording liquid for printing alphanumeric characters and images in punctiform representation, each nozzle having a piezoelectric transducer associated therewith having a movable free end for forcing said recording liquid through said nozzles upon selected activation of said transducers, the improvement comprising a bilaminar comb-like piezoplate having a plurality of teeth forming said transducers, said plate having a carrier layer adjacent to said recording head and a piezoceramic layer, said piezoceramic layer for each of said transducer teeth terminating a distance from said free end of said transducer such that a fraction of said transducers respectively overlying said nozzles consists solely of exposed carrier layer, said fraction of said transducers being lighter and thinner than a remainder of said piezoplate.
Claim 3
Dependent Claim
16 words
The improvement of claim 1 wherein said fraction is in the range of 1/5 to 1/2.
Claim 4
Dependent Claim
10 words
The improvement of claim 2 wherein said fraction is 1/3.
Claim 5
Dependent Claim
36 words
The improvement of claim 1 wherein said exposed carrier layer and a portion of said piezoceramic layer for each transducer is ground such that said transducer tapers to a thinnest point at said free end thereof.
Claim 6
Dependent Claim
26 words
The improvement of claim 1 wherein said exposed carrier layer is ground such that said transducer tapers to a thinnest point at said free end thereof.
References Cited (Backward Citations)
US2900536A
Cited
US4072959A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-20 | 1987-09-19 | 1988-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-20 | 1991-09-19 | 1992-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-20 | 1995-09-19 | 1996-03-20 | $7700.00 | Window Closed / Lapsed |