US3823408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High performance ink jet nozzle
Assignee: International Business Machines Corp
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Filing: 1972-11-29
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Granted: 1974-07-09
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Expires: 1992-11-29
Abstract
Abstract An improved ink jet nozzle structure utilizes an ink supply chamber having a source of ink under pressure connected thereto and a nozzle passage provided with a jewel nozzle having an orifice with a low aspect ratio and defined by an abrupt or sharp entrance on the chamber side.
Inventors
- 👤 W Gordon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:19
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/015; B41J2/02; B21; B21D; B21D39/00; B21D39/06; B21D39/066
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
172 words
In an ink drop nozzle apparatus comprising a hollow member to which ink is applied under a pressure of from 10 to 100 pounds per square inch, said member having a passage through which ink flows for the purpose of producing a succession of uniformly spaced substantially uniform ink drops, the improvement in said nozzle apparatus comprising a jewel nozzle positioned in said passage and having an orifice therethrough with a diameter in the range of .001 - .002 inches and a length of .0005 - .001 inches thus providing an aspect ratio of Hole Length/Hole Diameter which is less than 1.0, and having a sharp entrance edge defined by a plane surface surrounding said entrance edge which is perpendicular to the axis of said orifice and an outwardly flared exit surface immediately adjacent said orifice, said orifice, plane surface, and entrance edge being hydraulically smooth so as to provide with said aspect ratio incompletely developed laminar flow of said ink, whereby the formation of satellite ink drops between drops is minimized.
Claim 2
Dependent Claim
172 words
In an ink drop nozzle apparatus comprising a hollow member to which ink is applied under a pressure of from 10 to 100 pounds per square inch, said member having a passage through which ink flows for the purpose of producing a succession of uniformly spaced substantially uniform ink drops, the improvement in said nozzle apparatus comprising a jewel nozzle positioned in said passage and having an orifice therethrough with a diameter in the range of .001 - .002 inches and a length of .0005 - .001 inches thus providing an aspect ratio of Hole Length/Hole Diameter which is less than 1.0, and having a sharp entrance edge defined by a plane surface surrounding said entrance edge which is perpendicular to the axis of said orifice and an outwardly flared exit surface immediately adjacent said orifice, said orifice, plane surface, and entrance edge being hydraulically smooth so as to provide with said aspect ratio incompletely developed laminar flow of said ink, whereby the formation of satellite ink drops between drops is minimized.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-08 | 1978-01-07 | 1978-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-08 | 1982-01-07 | 1982-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-08 | 1986-01-07 | 1986-07-09 | $7700.00 | Window Closed / Lapsed |