# US 4,395,720 A · Configurational reduction of pulse ejector crosstalk

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- Number: US 4,395,720 A
- Document ID: US4395720A
- Status: Granted
- Kind: A
- Application number: 06/306,794
- Filed: 1981-09-29
- Granted: 1983-07-26
- Earliest claimed: 1981-09-29
- Assignees: Xerox Corporation
- Inventors: Joel W. Grover; Kenneth H. Fischbeck
- Web page: https://patentgrep.com/patent/US4395720A

## CPC

- B41J 2/07: characterised by jet control (B41J2/205 takes precedence)
- B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS

## Abstract

A method of minimizing crosstalk between transducer driven pulse liquid droplet ejectors in ejector arrays. An array mounted on a scanning carriage and having nozzles inclined to the direction of relative motion between the carriage and the print-receiving member is designed such that adjacent nozzles are not fired simultaneously. Similarly, an oscillating bar pulse ejector array is designed such that adjacent nozzles are not fired simultaneously.

## Claims

### Claim 1

A method of minimizing crosstalk between transducer driven pulsed liquid droplet ejectors in an ejector array comprising:
(a) providing a predetermined regularly spaced set of potential pixel locations on a predetermined line of printing;
(b) providing an array of regularly spaced pulsed liquid droplet ejectors in a row, said ejectors being spaced in said array such that no two adjacent ejectors are aligned with said pixel locations at the same time; and
(c) addressing said pulsed liquid droplet ejectors only when said ejectors are aligned with a pixel location.

### Claim 2

A method of minimizing crosstalk between transducer driven pulsed liquid droplet ejectors in an ejector array comprising:
(a) providing a predetermined regularly spaced set of potential pixel locations in at least two parallel rows, said rows being aligned along a predetermined line of printing and spaced apart a predetermined distance;
(b) providing an array of regularly spaced pulsed liquid droplet ejectors aligned in a row, said array being inclined at an angle .theta. with respect to the predetermined line of printing and said ejectors being spaced apart from each other a distance m, wherein m satisfies the equations:
m sin .theta.=K pixels
and
m cos .theta.=1/n pixels
and wherein K, 1 and n are integers; 1 and n having no common factors, and 1 and n not being equal to one; and
(c) scanning said array along said predetermined line of printing while addressing said pulsed liquid droplet ejectors only when said ejectors are aligned with a potential pixel location.

### Claim 3

A method of minimizing crosstalk between transducer driven pulsed liquid droplet ejectors in an array comprising:
(a) providing a predetermined regularly spaced set of potential pixel locations on a predetermined line of printing;
(b) providing an array of regularly spaced pulsed liquid droplet ejectors aligned in a row over the said pixel locations, said array having ejectors spaced 1/n pixels apart, 1 and n being integers having no common factors, and n not being equal to 1; and
(c) scanning said array long said row of pixels while addressing said pulsed liquid ejectors only when said ejectors are aligned with a potential pixel location.