US3833910A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ink drop printer charge compensation
Assignee: International Business Machines Corp
•
Filing: 1973-06-18
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Granted: 1974-09-03
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Expires: 1993-06-18
Abstract
Abstract Every other drop in an ink jet printer is charged for use in printing, and intervening drops are charged negatively with a charge proportional to the charge on the preceding drop.
Inventors
- 👤 W Chen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:22
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/07; B41J2/075
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
78 words
A method of drop charge compensation in an ink drop printer comprising the steps of charging spaced apart drops with positive data signals, leaving at least one other drop between each data signal charged drop, and charging said other drops with a charge proportional to but of the opposite polarity of the charge on a preceding signal charged drop to negative the effect of one positively charged data signal drop on an adjacent positively charged data signal drop.
Claim 2
Independent Claim
78 words
A method of drop charge compensation in an ink drop printer comprising the steps of charging spaced apart drops with positive data signals, leaving at least one other drop between each data signal charged drop, and charging said other drops with a charge proportional to but of the opposite polarity of the charge on a preceding signal charged drop to negative the effect of one positively charged data signal drop on an adjacent positively charged data signal drop.
Claim 3
Independent Claim
99 words
The method of drop charge compensation in an ink drop printer which comprises the steps of producing ink drops at predetermined spaced intervals, charging selected ones of said ink drops which are separated by at least one intervening drop, with data signals for printing, and charging at least one of said intervening drops between each pair of data signal charged drops with a charge proportional to but of the opposite polarity of the preceding one of said data signal charged drop, to negative the effect of said one data signal charged drop on an adjacent data signal charged drop.
Claim 4
Independent Claim
99 words
The method of drop charge compensation in an ink drop printer which comprises the steps of producing ink drops at predetermined spaced intervals, charging selected ones of said ink drops which are separated by at least one intervening drop, with data signals for printing, and charging at least one of said intervening drops between each pair of data signal charged drops with a charge proportional to but of the opposite polarity of the preceding one of said data signal charged drop, to negative the effect of said one data signal charged drop on an adjacent data signal charged drop.
Claim 5
Dependent Claim
136 words
In an ink drop printer having a nozzle for producing a stream of iNk drops, transducer means associated with said nozzle for producing varicosities in said stream to insure uniform drop formation, clock means for applying timed pulses to said transducer means, a charging electrode positioned in spaced relation with said nozzle for charging selected ones of said drops, deflection means providing a field to deflect said charged drops, and means connecting said charging electrode to a source of data signals, the improvement comprising circuit means connected between said charging electrode, and said source of data signals and said clock means to charge selected spaced apart drops from said source for printing and other drops between said selected drops with a charge proportional to but of the opposite polarity of that of a preceding selected drop.
Claim 6
Dependent Claim
136 words
In an ink drop printer having a nozzle for producing a stream of iNk drops, transducer means associated with said nozzle for producing varicosities in said stream to insure uniform drop formation, clock means for applying timed pulses to said transducer means, a charging electrode positioned in spaced relation with said nozzle for charging selected ones of said drops, deflection means providing a field to deflect said charged drops, and means connecting said charging electrode to a source of data signals, the improvement comprising circuit means connected between said charging electrode, and said source of data signals and said clock means to charge selected spaced apart drops from said source for printing and other drops between said selected drops with a charge proportional to but of the opposite polarity of that of a preceding selected drop.
Claim 7
Dependent Claim
33 words
The invention as defined in claim 3 characterized by said circuit means including a digital to analog converter and an operational amplifier connected to effect energization of said charging electrode from said source.
Claim 8
Dependent Claim
25 words
The invention as defined in claim 4 characterized by said circuit means including gate means connecting said converter and said clock means to said amplifier.
Claim 9
Dependent Claim
25 words
The invention as defined in claim 5 characterized by said circuit means including an inverter connecting said clock means to one of said gate means.
Claim 10
Dependent Claim
26 words
The invention as defined in claim 3 characterized by said circuit means including means dividing said clock pulses connecting said clock means to said gate means.
Claim 11
Dependent Claim
18 words
The invention as defined in claim 3 characterized by said dividing means reducing said clock pulses by one-half.
Claim 12
Dependent Claim
18 words
The invention as defined in claim 3 characterized by said dividing means reducing said clock pulses by two-thirds.
References Cited (Backward Citations)
US3562757A
Cited
US3631511A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |