US3927410A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ink jet nozzle
Assignee: International Business Machines Corp
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Filing: 1974-04-30
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Granted: 1975-12-16
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Expires: 1994-04-30
Abstract
Abstract An ink jet nozzle comprises a unitary construction of a nozzle plate having a jewel orifice on one face with a passage through the plate at right angles thereto for supplying ink to the nozzle under pressure, a reaction mass and a piezoelectric ceramic connecting the nozzle plate and the reaction mass. The assembly is secured to a support by a silicone rubber isolation damper which permits the nozzle plate, piezoelectric ceramic, and the reaction mass to vibrate as a unit at a selected frequency to effect uniform break off of ink drops from the ink stream issuing from the nozzle.
Inventors
- 👤 Walter T Pimbley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:11
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/015; B41J2/02; B41J2/025; B41J2/135; B41J2/14; B41J2002/14362
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
80 words
In an ink jet printer apparatus, a support member, a substantially flat ink jet nozzle structure disposed for connection to a source of ink, a reaction mass, damping means resiliently connecting said reaction mass to said support member, and transducer means operating in a thickness mode connecting said nozzle structure to said reaction mass for producing resonant periodic bodily vibration of said nozzle and reaction mass independently of said support member to produce periodic drops of ink from said nozzle.
Claim 2
Dependent Claim
80 words
In an ink jet printer apparatus, a support member, a substantially flat ink jet nozzle structure disposed for connection to a source of ink, a reaction mass, damping means resiliently connecting said reaction mass to said support member, and transducer means operating in a thickness mode connecting said nozzle structure to said reaction mass for producing resonant periodic bodily vibration of said nozzle and reaction mass independently of said support member to produce periodic drops of ink from said nozzle.
Claim 3
Dependent Claim
43 words
The invention as defined in claim 1 characterized by said ink jet nozzle structure comprising a plate having a nozzle opening on one surface and an opening through said plate at right angles to said nozzle opening for supplying ink thereto under pressure.
Claim 4
Dependent Claim
29 words
The invention as defined in claim 2 characterized by said transducer means comprising a piezoelectric crystal plate sandwiched between said nozzle plate and one surface of said reaction mass.
Claim 5
Dependent Claim
47 words
The invention as defined in claim 3 characterized by said nozzle plate, piezoelectric crystal, and reaction mass being cemented to each other in a sandwich arrangement by layers of epoxy resin with wire spacers included in said layers to maintain a predetermined uniform thickness of said layers.
Claim 6
Dependent Claim
48 words
The invention as defined in claim 3 characterized by said damping means comprising a body of silicone rubber secured tO said support member and to and partially surrounding said reaction mass on two opposite sides and the intervening surface away from the surface secured to said piezoelectric crystal.
Claim 7
Dependent Claim
140 words
The invention as defined in claim 3 characterized by the relative thicknesses of the nozzle plate, piezoelectric crystal, and reaction mass being related by the formula Cos k1 L1 (Sin k2 L2 Cos k3 L3 + H3 Cos k2 L2 Sin k3 L3) + H1 Sin k1 L1 (Cos k2 L2 Cos k3 L3 -H3 Sin k2 L2 Sin k3 L3) 0 where L1 L2 and L3 are the thicknesses of the nozzle plate, piezoelectric crystal and reaction mass, respectively; H1 and H3 are the acoustic impedance mismatches between the nozzle plate and piezoelectric crystal, and the piezoelectric crystal and reaction mass respectively; and k1 k2 and k3 equal omega /v1 omega /v2 and omega /v3, where v1, v2 and v3 are the velocities of the waves in the media of the nozzle plate, piezoelectric crystal and reaction mass, respectively.
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) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |