US3667678A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nozzle structure for jet printers
Assignee: International Business Machines Corp
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Filing: 1970-03-13
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Granted: 1972-06-06
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Expires: 1990-03-13
Abstract
Abstract An ink jet nozzle structure comprising a thin tube, connected to a pressurized ink reservoir, is encircled by an A. C. driven coil which induces longitudinal reciprocating motion to cause formation of ink droplets. A permanent magnet is in the proximity of the drive coil provides a biasing action. The tube length is chosen so as to permit it to vibrate resonantly at the frequency of the induced longitudinal reciprocating motion. Resonant vibration permits the tube to be supported at two points along its length greatly increasing its mechanical stability. An air damper located near the tip of the nozzle broadens the resonant response and provides differential signals proportional to the longitudinal movement of the tube to maintain movements at a fixed or preset level.
Inventors
- 👤 John W Haskell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:22
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/015; B41J2/02; B41J2/025
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
164 words
A nozzle vibrator providing a jet stream of individual ink droplets for an ink jet printer comprising: a length of metal tubing having a nozzle at one end thereof; a reservoir of pressurized ink connected to the opposite end of said tubing whereby the latter is supported for longitudinal vibration; a stationary drive coil encircling said tubing for producing an alternating magnetic field and inducing magnetostrictive effects therein to cause longitudinal vibration in said tubing in response to the application of a driving frequency to said drive coil, the resonant frequency of said tubing being a function of the dimensional relationships of said tubing and of the driving frequency, a support means for further supporting said tubing at a node point in the proximity of the nozzle end of said tubing, non-resonant damping means interconnected to said tubing to broaden the resonant response thereof, and means comprising a permanent magnet producing a fixed magnetic field to induce a constant magnetostrictive bias of said tubing.
Claim 2
Dependent Claim
164 words
A nozzle vibrator providing a jet stream of individual ink droplets for an ink jet printer comprising: a length of metal tubing having a nozzle at one end thereof; a reservoir of pressurized ink connected to the opposite end of said tubing whereby the latter is supported for longitudinal vibration; a stationary drive coil encircling said tubing for producing an alternating magnetic field and inducing magnetostrictive effects therein to cause longitudinal vibration in said tubing in response to the application of a driving frequency to said drive coil, the resonant frequency of said tubing being a function of the dimensional relationships of said tubing and of the driving frequency, a support means for further supporting said tubing at a node point in the proximity of the nozzle end of said tubing, non-resonant damping means interconnected to said tubing to broaden the resonant response thereof, and means comprising a permanent magnet producing a fixed magnetic field to induce a constant magnetostrictive bias of said tubing.
Claim 3
Dependent Claim
32 words
A nozzle vibrator as in claim 1 in which said damping means is further modified by the provision of electrical means providing differential signals proportional to the movement amplitude of said tubing.
Claim 4
Dependent Claim
37 words
A nozzle vibrator as in claim 2 further including a feedback control means electrically interconnected to said drive coil and responsive to said differential signals to monitor and maintain control over the resonant frequency of said tubing.
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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) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |