EP0103943A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method and apparatus for eliminating the effects of acoustic cross-talk in thermal ink jet printer
Assignee: HP Inc
•
Filing: 1983-06-08
•
Granted: —
•
Expires: 2003-06-08
Abstract
Abstract A side-shooting thermal ink jet printer is provided with a control circuit for permitting the ejection of ink droplets from printhead orifices at only certain times after the ejection of ink droplets from other orifices in the printhead so that crosstalk between orifices through the ink supply does not degrade the quality of the subsequently ejected ink droplets. A test circuit is provided for determining the optimum multiplex periods between ejection of ink droplets from adjacent orifices.
Inventors
- 👤 Christopher A. Tacklind
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 17:08
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/015; B41J2/04; B41J2/045; B41J2/04501; B41J2/04525; B41J2/04541; B41J2/04546; B41J2/04573; B41J2/0458; B41J2/135; B41J2/14; B41J2002/14387
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
106 words
A circuit for causing ink droplet ejections from a multiplicity of orifices resident on a thermal ink jet printer by selectively energizing orifice resistors associated with said orifices, said circuit being characterized in that it comprises: pattern generation means for generating a pattern signal, said pattern signal indicating the specific orifice resistors to be energized; and energization means for receiving the pattern signal from said pattern generation means and for energizing the orifice resistors indicated thereby with a predetermined multiplex time period between energizations of physically adjacent orifices wherein said multiplex time period is predetermined to substantially minimize the effects of acoustic crosstalk between adjacent orifices.
Claim 2
Dependent Claim
106 words
A circuit for causing ink droplet ejections from a multiplicity of orifices resident on a thermal ink jet printer by selectively energizing orifice resistors associated with said orifices, said circuit being characterized in that it comprises: pattern generation means for generating a pattern signal, said pattern signal indicating the specific orifice resistors to be energized; and energization means for receiving the pattern signal from said pattern generation means and for energizing the orifice resistors indicated thereby with a predetermined multiplex time period between energizations of physically adjacent orifices wherein said multiplex time period is predetermined to substantially minimize the effects of acoustic crosstalk between adjacent orifices.
Claim 3
Dependent Claim
18 words
A circuit according to claim 1 and characterized in that the pattern generation means comprises an addressable memory.
Claim 4
Independent Claim
84 words
A method of energizing orifice resistors of a thermal ink jet printhead, said method being characterized in that it comprises the steps of: determining a multiplex time period wherein a delay of said multiplex time period between energizations of physically adjacent orifice resistors substantially minimizes the effects of acoustic crosstalk between adjacent orifices associated with said adjacent orifice-resistors; and energizing the orifice resistors with a delay substantially equal to the multiplex time period between the energizations of orifice resistors associated with physically adjacent orifices.
Claim 5
Independent Claim
84 words
A method of energizing orifice resistors of a thermal ink jet printhead, said method being characterized in that it comprises the steps of: determining a multiplex time period wherein a delay of said multiplex time period between energizations of physically adjacent orifice resistors substantially minimizes the effects of acoustic crosstalk between adjacent orifices associated with said adjacent orifice-resistors; and energizing the orifice resistors with a delay substantially equal to the multiplex time period between the energizations of orifice resistors associated with physically adjacent orifices.
Claim 6
Dependent Claim
126 words
A method according to claim 3, characterized in that.the first step of determining a multiplex time period comprises the steps of: energizing a second orifice; measuring a base ejection distance travelled by an ink droplet ejected from a second orifice associated with said second orifice resistor; energizing, at a first time, a first orifice resistor associated with a.first orifice which is physically adjacent to the second orifice; energizing the second orifice resistor at a second time which is subsequent to the first time; measuring a second ejection distance travelled by an ink droplet ejected from the second orifice at the second time; and varying a difference between the first and the second times until the second ejection distance is substantially equal to the base ejection distance.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.