US4379246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric piezoelectric drive element for writing jets in mosaic ink printing devices
Assignee: INKJET SYSTEMS & Co KG GmbH
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Filing: 1980-05-09
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Granted: 1983-04-05
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Expires: 2000-05-09
Abstract
Abstract A piezoelectric drive element which surrounds an ink channel in a writing jet in a mosaic printing device is a winding formed by plies of thin synthetic foil having piezoelectric properties. The plies of the foil contact adjacent plies over large areas of adjacent plies and form a compression chamber in the interior of the winding which surrounds the ink chamber. Application of a voltage of a first polarity to the winding expands the winding and application of a voltage having an opposite polarity then contracts the winding forcing ink out of the chamber for printing. The winding and chamber may be surrounded by a covering of silicon rubber.
Inventors
- 👤 Max Guntersdorfer
- 👤 Peter Kleinschmidt
- 👤 Klaus Dietrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:58
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/135; B41J2/14; B41J2/14201; B41J2/1429; Y; Y10; Y10S; Y10S310/00; Y10S310/80
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
125 words
In a fluid ejecting writing jet having a cylindrical channel containing said fluid which terminates in a discharge aperture, a drive element for separately forcing droplets of said fluid out of said channel comprising a power consuming winding having a plurality of adjacent plies of a first foil comprised of piezoelectric material and a second foil comprised of insulating material which cylindrically surround a portion of said channel, said foils being coiled together such that said plies are in contact with adjacent plies over a substantial portion of their respective surfaces, and a means for connecting said winding to a pulsed voltage source for expanding and contracting the interior diameter of said winding and generating pressure for expelling said droplets of fluid from said channel.
Claim 2
Dependent Claim
125 words
In a fluid ejecting writing jet having a cylindrical channel containing said fluid which terminates in a discharge aperture, a drive element for separately forcing droplets of said fluid out of said channel comprising a power consuming winding having a plurality of adjacent plies of a first foil comprised of piezoelectric material and a second foil comprised of insulating material which cylindrically surround a portion of said channel, said foils being coiled together such that said plies are in contact with adjacent plies over a substantial portion of their respective surfaces, and a means for connecting said winding to a pulsed voltage source for expanding and contracting the interior diameter of said winding and generating pressure for expelling said droplets of fluid from said channel.
Claim 3
Dependent Claim
18 words
The drive element of claim 1 wherein said foil comprised of piezoelectric material is comprised of polyvinylidene difluoride.
Claim 4
Dependent Claim
18 words
The drive element of claim 1 wherein the foils comprising the winding are coated with a viscous adhesive.
Claim 5
Dependent Claim
21 words
The drive element of claim 1 wherein the winding is directly cast into a housing surrounding a portion of the channel.
Claim 6
Dependent Claim
22 words
The drive element of claim 1 wherein said winding is encapsulated over its outer surface and end faces with an elastic material.
Claim 7
Dependent Claim
44 words
The drive element of claim 1 wherein said means for connecting said winding to a pulsed voltage source are electrodes attached to said winding, said electrodes comprised of a material having a low modulus of elasticity, a high ductility and a high electrical conductivity.
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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) | 1986-04-04 | 1986-10-04 | 1987-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-04-04 | 1990-10-04 | 1991-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-04-04 | 1994-10-04 | 1995-04-05 | $7700.00 | Window Closed / Lapsed |