US4112433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Meniscus dampening drop generator
Assignee: Xerox Corp
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Filing: 1977-05-26
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Granted: 1978-09-05
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Expires: 1997-05-26
Abstract
Abstract A first pressure increase is effected in liquid in a pressure chamber to express liquid droplets therefrom. A time-delayed second pressure increase is effected in liquid in the same pressure chamber to effect a pressure front timed to arrive within an effective meniscus dampening vicinity of a droplet orifice at substantially the same instant that the droplet leaves the orifice to dampen substantially the full period of meniscus vibration.
Inventors
- 👤 Richard H. Vernon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:40
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/135; B41J2/14; B41J2/14201; B41J2/14298; B41J2/015; B41J2/04; B41J2/045; B41J2/055; B41J2002/14338
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
219 words
An ink jet assembly comprising: a droplet outlet orifice; a droplet producing pressure chamber means operatively communicated with said orifice to express a liquid droplet therethrough; means responsive to electrical pulses to effect a pressure increase in said chamber means; first means for effecting a first electrical pulse at said responsive means to effect a first pressure increase in the liquid in said chamber means; second means for effecting a second electrical pulse, which is separate from said first pulse, at said responsive means for effecting a second pressure increase in the liquid in said chamber means at a predetermined instant after said first pressure increase; the magnitude and duration of said first electrical pulse effecting said first pressure increase of such nature to express a liquid droplet from said droplet outlet orifice; the expression of a droplet from said droplet outlet orifice resulting in an inherent vibration amplitude of the meniscus formed in said outlet orifice after the droplet leaves therefrom; the predetermined instant, the magnitude and duration of said second electrical pulse effecting said second pressure increase of such nature to provide a pressure front at an effective meniscus dampening zone at substantially the instant the droplet leaves said orifice to substantially dampen the inherent vibration amplitude of the meniscus and decrease the period of meniscus stabilization.
Claim 2
Dependent Claim
219 words
An ink jet assembly comprising: a droplet outlet orifice; a droplet producing pressure chamber means operatively communicated with said orifice to express a liquid droplet therethrough; means responsive to electrical pulses to effect a pressure increase in said chamber means; first means for effecting a first electrical pulse at said responsive means to effect a first pressure increase in the liquid in said chamber means; second means for effecting a second electrical pulse, which is separate from said first pulse, at said responsive means for effecting a second pressure increase in the liquid in said chamber means at a predetermined instant after said first pressure increase; the magnitude and duration of said first electrical pulse effecting said first pressure increase of such nature to express a liquid droplet from said droplet outlet orifice; the expression of a droplet from said droplet outlet orifice resulting in an inherent vibration amplitude of the meniscus formed in said outlet orifice after the droplet leaves therefrom; the predetermined instant, the magnitude and duration of said second electrical pulse effecting said second pressure increase of such nature to provide a pressure front at an effective meniscus dampening zone at substantially the instant the droplet leaves said orifice to substantially dampen the inherent vibration amplitude of the meniscus and decrease the period of meniscus stabilization.
Claim 3
Dependent Claim
22 words
The structure as recited in claim 1 wherein said second electrical pulse is applied after substantial decay of said first electrical pulse.
Claim 4
Dependent Claim
26 words
The structure as recited in claim 1 wherein the magnitude and duration of said second electrical pulse is less than that of said first electrical pulse.
Claim 5
Dependent Claim
71 words
The structure as recited in claim 1 wherein said chamber means is one chamber, an outlet passage means communicates said pressure chamber to said droplet outlet orifice, a fluid supply chamber means, said droplet orifice being communicated with said fluid supply chamber means, said outlet passage means opening into said fluid supply chamber means, said fluid supply chamber means being located between said droplet outlet orifice and said outlet passage means.
Claim 6
Dependent Claim
78 words
The structure as recited in claim 1 wherein said pressure chamber means comprises two pressure chambers, each having an outlet passage means communicating said pressure chambers to said droplet outlet orifice, said outlet passage means intersecting each other adjacent said droplet outlet orifice, said outlet passage means and said outlet orifice being arranged relative to each other that a droplet is expressed from said orifice only when the liquid in said two chambers has a simultaneous pressure increase.
Claim 7
Dependent Claim
53 words
The structure as recited in claim 5 further comprising a fluid supply chamber means, said droplet outlet orifice being communicated with said fluid supply chamber means, said outlet passage means opening into said fluid supply chamber means, said fluid supply chamber means being located between said outlet orifice and said outlet passage means.
Claim 8
Dependent Claim
23 words
The structure as recited in claim 5 wherein said second pressure increase occurs simultaneously in the liquid in each of said pressure chambers.
Claim 9
Dependent Claim
24 words
The structure as recited in claim 5 wherein said second pressure increase occurs in the liquid in at least one of said pressure chambers.
Claim 10
Dependent Claim
14 words
The structure as recited in claim 1 wherein said chamber means is one chamber.
Claim 11
Dependent Claim
66 words
The structure as recited in claim 1 wherein said pressure chamber means comprises two pressure chambers, each having an outlet passage means communicating said pressure chambers to said droplet outlet orifice; said pressure chambers, outlet passage means and orifice being so arranged and constructed that a droplet is expressed from said orifice only when the liquid in said two chambers is pressurized at the same time.
Claim 12
Dependent Claim
24 words
The structure as recited in claim 10 wherein said second pressure increase occurs in the liquid in at least one of said pressure chambers.
Claim 13
Independent Claim
114 words
A method for dampening a meniscus vibration amplitude in a liquid drop generator comprising: effecting a first pressure to express a liquid droplet through an outlet orifice by actuating a tranducer means, said expression of the droplet by the first pressure resulting in an inherent meniscus vibration amplitude after the droplet leaves the orifice, substantially dampening said inherent meniscus vibration amplitude and thereby decreasing the period of meniscus stabilization by actuating the same transducer means a predetermined instant after the first named actuation thereof and generating a pressure front of such magnitude and duration within an effective meniscus dampening vicinity of the outlet orifice at substantially the same instant the droplet leaves the orifice.
Claim 14
Independent Claim
114 words
A method for dampening a meniscus vibration amplitude in a liquid drop generator comprising: effecting a first pressure to express a liquid droplet through an outlet orifice by actuating a tranducer means, said expression of the droplet by the first pressure resulting in an inherent meniscus vibration amplitude after the droplet leaves the orifice, substantially dampening said inherent meniscus vibration amplitude and thereby decreasing the period of meniscus stabilization by actuating the same transducer means a predetermined instant after the first named actuation thereof and generating a pressure front of such magnitude and duration within an effective meniscus dampening vicinity of the outlet orifice at substantially the same instant the droplet leaves the orifice.
Claim 15
Independent Claim
118 words
A method for dampening a meniscus vibration amplitude in a liquid drop generator comprising: effecting a first pressure to express a liquid droplet through an outlet orifice by actuating two transducer means, said expression of the droplet by the first pressure resulting in an inherent meniscus vibration amplitude after the droplet leaves the orifice, substantially dampening said inherent meniscus vibration amplitude and thereby decreasing the period of meniscus stabilization by actuating at least one of said two transducer means a predetermined instant after the first named actuation thereof and generating a pressure front of such magnitude and duration within an effective meniscus dampening vicinity of the outlet orifice at substantially the same instant the droplet leaves the orifice.
Claim 16
Independent Claim
118 words
A method for dampening a meniscus vibration amplitude in a liquid drop generator comprising: effecting a first pressure to express a liquid droplet through an outlet orifice by actuating two transducer means, said expression of the droplet by the first pressure resulting in an inherent meniscus vibration amplitude after the droplet leaves the orifice, substantially dampening said inherent meniscus vibration amplitude and thereby decreasing the period of meniscus stabilization by actuating at least one of said two transducer means a predetermined instant after the first named actuation thereof and generating a pressure front of such magnitude and duration within an effective meniscus dampening vicinity of the outlet orifice at substantially the same instant the droplet leaves the orifice.
References Cited (Backward Citations)
US3946398A
Cited
US3683212A
Cited
US3747120A
Cited
US3848118A
Cited
US3832579A
Cited
US4024544A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-09-04 | 1982-03-06 | 1982-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-04 | 1986-03-06 | 1986-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-04 | 1990-03-06 | 1990-09-05 | $7700.00 | Window Closed / Lapsed |