US4386358A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ink jet printing using electrostatic deflection
Assignee: Xerox Corp
•
Filing: 1981-09-22
•
Granted: 1983-05-31
•
Expires: 2001-09-22
Abstract
Abstract Electrostatic deflection is used in an oscillating bar drop-on-demand ink jet printer to compensate for about one half of the droplet displacement caused by bar velocity. The disclosed system provides a method for printing that is not sensitive to variations in ink droplet ejection velocity.
Inventors
- 👤 Kenneth H. Fischbeck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:23
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/07; B41J2/13
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
41 words
A method of correcting droplet placement errors caused by droplet ejection velocity variation in an oscillating bar ink jet printer, which comprises: electrostatically deflecting droplets in a direction to compensate for approximately one-half of the bar velocity induced droplet placement error.
Claim 2
Independent Claim
41 words
A method of correcting droplet placement errors caused by droplet ejection velocity variation in an oscillating bar ink jet printer, which comprises: electrostatically deflecting droplets in a direction to compensate for approximately one-half of the bar velocity induced droplet placement error.
Claim 3
Dependent Claim
101 words
The method of claim 1 and further including the steps of: providing a row of ink jet nozzles placed on said bar parallel to an axis of said bar; providing a first and a second electrode, one on either side of each of said ink jet nozzles, and positioned between said nozzles in a line parallel to said axis of said oscillating bar; providing direction sensor means for sensing the direction of movement of said oscillating bar; and providing control means responsive to said direction sensor means to apply electrical potential to the trailing electrode of said first and second electrodes.
Claim 4
Dependent Claim
44 words
The method of claim 2 and further including the steps of: providing velocity sensor means for sensing the velocity of said oscillating bar; and providing control means responsive to said velocity sensor means to control the amount of potential applied to said trailing electrode.
References Cited (Backward Citations)
US3136594A
Cited
US3938163A
Cited
US3871004A
Cited
US4138688A
Cited
US4349828A
Cited
US4314282A
Cited
US4322063A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-30 | 1986-11-29 | 1987-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-30 | 1990-11-29 | 1991-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-30 | 1994-11-29 | 1995-05-31 | $7700.00 | Window Closed / Lapsed |