US4228440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ink jet printing apparatus
Assignee: Ricoh Co Ltd
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Filing: 1978-12-18
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Granted: 1980-10-14
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Expires: 1998-12-18
Abstract
Abstract Ink is fed to an ink jet printing head (12) from which it is ejected into a sheet of printing paper (19). A plurality of capacitive ultrasonic vibrators (29), (31) are provided inside the printing head (12) to atomize ink therein prior to ejection. The ultrasonic vibrators (29), (31) are connected in parallel with each other and also to an inductor (48) to constitute a resonant circuit. An electrical drive signal is applied to the resonant circuit, the frequency of the drive signal being equal to the resonant frequency of the resonant circuit.
Inventors
- 👤 Masanori Horike
- 👤 Koichiro Jinnai
- 👤 Kyuhachiro Iwasaki
- 👤 Yutaka Kodama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:29
CPC Classifications
G; G01; G01D; G01D15/00; G01D15/16; G01D15/18; B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/015; B41J2/02; B41J2/025
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
82 words
An ink jet printing apparatus including an ink ejection head and a plurality of capacitive ultrasonic vibrators disposed in the ink ejection head for atomizing ink flowing therethrough, characterized by comprising: circuit means connecting the ultrasonic vibrators in parallel; an inductor connected to the ultrasonic vibrators to form a resonant circuit therewith; and signal generator means for applying an alternating electrical signal to the resonant circuit, a frequency of the electrical signal being equal to a resonant frequency of the resonant circuit.
Claim 2
Dependent Claim
82 words
An ink jet printing apparatus including an ink ejection head and a plurality of capacitive ultrasonic vibrators disposed in the ink ejection head for atomizing ink flowing therethrough, characterized by comprising: circuit means connecting the ultrasonic vibrators in parallel; an inductor connected to the ultrasonic vibrators to form a resonant circuit therewith; and signal generator means for applying an alternating electrical signal to the resonant circuit, a frequency of the electrical signal being equal to a resonant frequency of the resonant circuit.
Claim 3
Dependent Claim
25 words
An apparatus as in claim 1, in which the inductor is connected in parallel with the ultrasonic vibrators to constitute a parallel resonant circuit therewith.
Claim 4
Dependent Claim
21 words
An apparatus as in claim 2, in which the signal generator means is connected in series with the parallel resonant circuit.
Claim 5
Dependent Claim
24 words
An apparatus as in claim 1, in which the inductor is connected in series with the ultrasonic vibrators to constitute a series resonant circuit.
Claim 6
Dependent Claim
18 words
An apparatus as in claim 4, in which the signal generator means is connected across the ultrasonic vibrators.
Claim 7
Dependent Claim
18 words
An apparatus as in claim 1, further comprising a variable capacitor connected in parallel with the ultrasonic vibrators.
Claim 8
Dependent Claim
14 words
An apparatus as in claim 6, in which the variable capacitor is a varactor.
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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) | 1983-10-14 | 1984-04-14 | 1984-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-14 | 1988-04-14 | 1988-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-14 | 1992-04-14 | 1992-10-14 | $7700.00 | Window Closed / Lapsed |