US3810194A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid jet printer having a droplet detecting device
Assignee: Hitachi Ltd
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Filing: 1973-06-25
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Granted: 1974-05-07
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Expires: 1993-06-25
Abstract
Abstract An ink jet printer includes a device for generating a pulse in response to a droplet formation or movement, in order to synchronize the operation of a deflection means or a pattern generating means of the ink jet printer with the pulse from the droplet detecting means. The ink droplet detecting means has an electro-conductive plate, which can be used as an accelerating electrode, and a resistor through which the electro-conductive plate is connected to a voltage supply for applying a voltage between the ink to be issued out and the electro-conductive plate.
Inventors
- 👤 T Doi
- 👤 T Takahashi
- 👤 K Tokunaga
- 👤 T Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:29
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/07; B41J2/115
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
169 words
In a liquid jet printer including a nozzle filled with a liquid for printing characters; an accelerating electrode disposed adjacent said nozzle for producing droplets from the liquid in the nozzle and accelerating said droplets along a path; memory means for storing information relating to the pattern of each of the characters to be printed; deflecting means for deflecting the droplets passing along said path in accordance with the information derived from said memory means; and a recording medium disposed opposite said nozzle for receiving the droplets deflected by said deflecting means; the improvement comprising droplet detecting means for generating signal pulses representing a condition of generation and movement of the droplet, said detecting means being arranged so that the generation and the movement of the droplet are detected before the droplet arrives at said deflecting means and means for applying the signal pulses of said detecting means to trigger said memory means to read out the information of the desired characters to be printed on said recording medium.
Claim 2
Dependent Claim
169 words
In a liquid jet printer including a nozzle filled with a liquid for printing characters; an accelerating electrode disposed adjacent said nozzle for producing droplets from the liquid in the nozzle and accelerating said droplets along a path; memory means for storing information relating to the pattern of each of the characters to be printed; deflecting means for deflecting the droplets passing along said path in accordance with the information derived from said memory means; and a recording medium disposed opposite said nozzle for receiving the droplets deflected by said deflecting means; the improvement comprising droplet detecting means for generating signal pulses representing a condition of generation and movement of the droplet, said detecting means being arranged so that the generation and the movement of the droplet are detected before the droplet arrives at said deflecting means and means for applying the signal pulses of said detecting means to trigger said memory means to read out the information of the desired characters to be printed on said recording medium.
Claim 3
Dependent Claim
22 words
A liquid jet printer according to claim 1 wherein said droplet detecting means is provided between said nozzle and said deflecting means.
Claim 4
Dependent Claim
55 words
A liquid jet printer according to claim 2 wherein said droplet detecting means has an electrode provided along said path of the droplets which also forms said accelerating electrode, and a resistor connected with said electrode and to a D.C. supply for applying an accelerating voltage between said electrode and said liquid in the nozzle.
Claim 5
Dependent Claim
29 words
A liquid jet printer according to claim 3, further including shield means for shielding the electrode of the droplet detecting means from the electric field of said deflecting means.
Claim 6
Dependent Claim
30 words
A liquid jet printer according to claim 4 wherein the electrode of the liquid droplet detector has an opening through which droplets from the nozzle pass toward said printing medium.
Claim 7
Dependent Claim
15 words
A liquid jet printer according to claim 3 wherein said resistor is a noninductive resistor.
Claim 8
Dependent Claim
28 words
A liquid jet printer according to claim 3, further including counter means for controlling said memory means in accordance with the signal pulses from the droplet detecting means.
Claim 9
Dependent Claim
45 words
A liquid jet printer in accordance with claim 5 wherein said accelerating electrode has an opening therein through which said droplets pass on said path to said recording medium, said opening in said electrode having a radially increasing diameter in the direction of said nozzle.
Claim 10
Dependent Claim
32 words
A liquid jet printer according to claim 3, further including delay circuit means for delaying said pulses from said droplet detecting means wherein said memory means is triggered by the delayed pulses.
Claim 11
Dependent Claim
70 words
A liquid jet printer according to claim 3 wherein said memory means includes a character matrix providing outputs relating to the pattern of each of the characters to be printed, input means connected to said character matrix for selecting a particular character, and timing means responsive to the signal pulses from said detector for triggering said character matrix to sequentially read out signals defining respective portions of the selected character.
Claim 12
Dependent Claim
33 words
A liquid jet printer accorDing to claim 10 wherein said timing means includes a counter receiving said signal pulses from said detector and a decoder connected between said counter and said character matrix.
Claim 13
Dependent Claim
37 words
A liquid jet printer according to claim 11, further including inhibit means connected to the output of said counter for inhibiting the output of said character matrix during a selected portion of the count of said counter.
References Cited (Backward Citations)
US3060429A
Cited
US3380584A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-06 | 1977-11-05 | 1978-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-06 | 1981-11-05 | 1982-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-06 | 1985-11-05 | 1986-05-07 | $7700.00 | Window Closed / Lapsed |