EP0303350A1
Expired / Lapsed
EP
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Offset nozzle droplet formation
Assignee: HP Inc
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Filing: 1988-07-06
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Granted: —
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Expires: 2008-07-06
Abstract
Abstract A device, particularly useful for thermal ink-jet printheads, for improving the repeatability of droplet volume is disclosed. Offsetting a nozzle (6) from its corresponding ink heating element (2) perpendicularly to the flow of ink across the element has been found to significantly reduce the ejected droplet volume deviation.
Inventors
- 👤 Winthrop D. Childers
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 18:51
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/135; B41J2/14; B41J2/14016; B41J2/14032; B41J2/1404; B41J2002/14185; B41J2002/14387; B41J2202/00; B41J2202/01; B41J2202/11
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
60 words
A device for ejecting fluid in droplet form, having a substrate, heating means on said substrate for thermally exciting said fluid, and ejecting means superposing said substrate for ejecting said fluid in droplet form, comprising: said ejecting means having an aperture being offset from said heating means perpendicularly to the direction of flow of said fluid across said heating means.
Claim 2
Independent Claim
60 words
A device for ejecting fluid in droplet form, having a substrate, heating means on said substrate for thermally exciting said fluid, and ejecting means superposing said substrate for ejecting said fluid in droplet form, comprising: said ejecting means having an aperture being offset from said heating means perpendicularly to the direction of flow of said fluid across said heating means.
Claim 3
Dependent Claim
66 words
An improved ink jet printhead, having a substrate, orifice means superposing said substrate for ejecting ink, channelling means on said substrate for channelling ink to said orifice means, and at least one heating means on said substrate in said channelling means, characterized by: nozzle means, in said orifice means, for ejecting ink droplets, having a center point which is offset from said heating means center point.
Claim 4
Dependent Claim
66 words
An improved ink jet printhead, having a substrate, orifice means superposing said substrate for ejecting ink, channelling means on said substrate for channelling ink to said orifice means, and at least one heating means on said substrate in said channelling means, characterized by: nozzle means, in said orifice means, for ejecting ink droplets, having a center point which is offset from said heating means center point.
Claim 5
Dependent Claim
17 words
The device as set forth in claim 2, characterized by one nozzle means for each heating means.
Claim 6
Dependent Claim
26 words
The device as set forth in claim 2, wherein said offset is in the direction substantially perpendicular to the flow of ink in said channelling means.
Claim 7
Dependent Claim
27 words
The device as set forth in claim 4, wherein said offset is perpendicular to the longitudinal axis of said channel means with respect to said heating means.
Claim 8
Dependent Claim
90 words
An ink jet printhead, comprising: a substrate, channeling means for channeling ink across at least one predetermined area of said substrate, at least one heating means, on said predetermined area of said substrate, for thermally exciting ink in said channel, orifice means, superposing said channeling means, for ejecting droplets of said ink from said printhead, and at least one nozzle in said orifice means having a geometric centerpoint which is offset from the geometric centerpoint of said heating means perpendiculary to the flow of said channelled ink across said area.
Claim 9
Dependent Claim
90 words
An ink jet printhead, comprising: a substrate, channeling means for channeling ink across at least one predetermined area of said substrate, at least one heating means, on said predetermined area of said substrate, for thermally exciting ink in said channel, orifice means, superposing said channeling means, for ejecting droplets of said ink from said printhead, and at least one nozzle in said orifice means having a geometric centerpoint which is offset from the geometric centerpoint of said heating means perpendiculary to the flow of said channelled ink across said area.
Claim 10
Dependent Claim
17 words
The device as set forth in claim 6, wherein said heating means comprises: a thin film resistor.
Claim 11
Dependent Claim
17 words
The device as set forth in claim 6, further comprising: one nozzle means for each heating means.
References Cited (Backward Citations)
DE3347175A1
Cited
DE3402680A1
Cited
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