US3914772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ink jet type printing device
Assignee: Casio Computer Co Ltd
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Filing: 1973-10-25
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Granted: 1975-10-21
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Expires: 1993-10-25
Abstract
Abstract An ink jet type printing device is adapted to jet ink droplets from a nozzle to print a character, pattern etc. on a recording medium. The device includes a high tension generator connected to the nozzle to supply electric charges to an ink to be jetted and a heat sensitive element arranged in the neighborhood of the nozzle to detect the temperature change of ink which causes the resistance of the heat sensitive element to be varied to permit an output voltage of the high tension generator to be variably controlled, thereby making the size of the ink droplets uniform for accurate printing.
Inventors
- 👤 Toshio Kashio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:35
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/015; B41J2/02; B41J2/03; B41J2/07; B41J2/072
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
168 words
An ink jet type printing device for ejecting ink droplets of substantially uniform size, comprising: a high voltage generator (20); a nozzle (11); means for supplying ink to said nozzle at substantially constant pressure; means coupled to said high voltage generator and responsive to the high voltage supplied from said high voltage generator for creating an electrostatic force in thE vicinity of said nozzle for causing ink particles to be ejected from said nozzle under the influence of said electrostatic force at substantially constant ink pressure so as to record characters, patterns, etc. on a recording medium; a heat sensitive element (25) disposed adjacent to said nozzle (11) to detect the temperature of the ink supplied to said nozzle and for generating a detection output; and control means (40) variably controlling the output voltage from the high voltage generator (20) as a function of the detection output of said heat sensitive element (25), which detection output represents the ambient temperature of the ink supplied to said nozzle (11).
Claim 2
Dependent Claim
168 words
An ink jet type printing device for ejecting ink droplets of substantially uniform size, comprising: a high voltage generator (20); a nozzle (11); means for supplying ink to said nozzle at substantially constant pressure; means coupled to said high voltage generator and responsive to the high voltage supplied from said high voltage generator for creating an electrostatic force in thE vicinity of said nozzle for causing ink particles to be ejected from said nozzle under the influence of said electrostatic force at substantially constant ink pressure so as to record characters, patterns, etc. on a recording medium; a heat sensitive element (25) disposed adjacent to said nozzle (11) to detect the temperature of the ink supplied to said nozzle and for generating a detection output; and control means (40) variably controlling the output voltage from the high voltage generator (20) as a function of the detection output of said heat sensitive element (25), which detection output represents the ambient temperature of the ink supplied to said nozzle (11).
Claim 3
Dependent Claim
53 words
An ink jet type printing device according to claim 1 wherein said heat sensitive element comprises a variable resistance element, the resistance of which varies with the temperature thereof, said control means variably controlling the output voltage from the high voltage generator as a function of the resistance of said heat sensitive element.
Claim 4
Dependent Claim
31 words
An ink jet type printing device according to claim 2 wherein the resistance of said heat sensitive element decreases with a rise in temperature and increases with a drop in temperature.
Claim 5
Dependent Claim
37 words
An ink jet type printing device according to claim 1 wherein said control means comprises a constant voltage circuit, the constant voltage output of which is a function of the detection output of said heat sensitive element.
Claim 6
Dependent Claim
74 words
An ink jet type printing device according to claim 4 wherein said high voltage generator comprises a DC-DC converter, the input of which is connected to the output of said control means whereby when the constant voltage output of said control means decreases, the high voltage output of said high voltage generator decreases, and when the constant voltage output of said control means increases, the high voltage output of said high voltage generator increases.
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) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |