# US 2013/0278657 A1 · Calibrating a Program that Detects a Condition of an Inkjet Nozzle

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- Number: US 2013/0278657 A1
- Document ID: US20130278657A1
- Status: Published application
- Kind: A1
- Application number: 13/450,651
- Filed: 2012-04-19
- Published: 2013-10-24
- Earliest claimed: 2012-04-19
- Assignees: Hewlett-Packard Development Company, L.P.
- Inventors: Eric T. Martin; Andrew L. Van Brooklin; David Maxfield
- Web page: https://patentgrep.com/patent/US20130278657A1

## CPC

- B41J 2/0451: {for detecting failure, e.g. clogging, malfunctioning actuator}
- B41J 2/0458: {controlling heads based on heating elements forming bubbles}
- B41J 2/14153: {Structures including a sensor}
- B41J 2002/14354: {Sensor in each pressure chamber}
- B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS

## Abstract

A method for calibrating a program that detects a condition of an inkjet nozzle includes receiving measurement information from a sensor positioned to detect a drive bubble in an ink chamber of an inkjet nozzle; and modifying a program that determines a condition of said inkjet nozzle.

## Claims

### Claim 1

A method for calibrating a program that detects a condition of an inkjet nozzle, comprising:
receiving measurement information from a sensor positioned to detect a drive bubble in an ink chamber of an inkjet nozzle; and
modifying a program that determines a condition of said inkjet nozzle.

### Claim 2 (depends on 1)

The method of claim 1, wherein modifying a program that determines a condition of said inkjet nozzle includes determining a drive bubble formation time.

### Claim 3 (depends on 1)

The method of claim 1, wherein modifying a program that determines a condition of said inkjet nozzle includes determining a drive bubble collapse time.

### Claim 4 (depends on 1)

The method of claim 1, wherein modifying a program that determines a condition of said inkjet nozzle includes determining an impedance threshold value for detecting said drive bubble with said sensor.

### Claim 5 (depends on 1)

The method of claim 1, wherein modifying a program that determines a condition of said inkjet nozzle includes determining a blocked nozzle condition collapse time based on said measurement information.

### Claim 6 (depends on 1)

The method of claim 1, wherein modifying a program that determines a condition of said inkjet nozzle includes determining a stray bubble collapse time based on said measurement information.

### Claim 7 (depends on 1)

The method of claim 1, wherein modifying a program that determines a condition of said inkjet nozzle includes determining a weak bubble collapse time based on said measurement information.

### Claim 8 (depends on 1)

The method of claim 1, wherein modifying a program that determines a condition of said inkjet nozzle includes determining to customize parameters of said program for other nozzles incorporated into a common print head with said inkjet nozzle.

### Claim 9 (depends on 1)

The method of claim 1, where said measurement information comprises an impedance measurement.

### Claim 10

A printer comprising:
a detection system in said printer comprising a sensor positioned to detect a presence of a drive bubble in an ink chamber associated with a nozzle;
a processor in communication with said detection system;
said processor programmed to:
receive measurement information from said detection system; and
modify a program that runs said detection system based on said measurement information.

### Claim 11 (depends on 10)

The printer of claim 10, wherein said processor programmed to modify a program that runs said detection system based on said measurement information includes determining a drive bubble formation time and a drive bubble collapse time under healthy nozzle operating conditions.

### Claim 12 (depends on 10)

The printer of claim 10, wherein said processor programmed to modify a program that runs said detection system based on said measurement information includes determining a drive bubble formation time and a drive bubble collapse time under at least one unhealthy nozzle operating condition.

### Claim 13 (depends on 12)

The printer of claim 12, wherein said at least one unhealthy nozzle operating condition includes a blocked nozzle outlet, a blocked nozzle inlet, a weak drive bubble formation, a presence of a weak stray bubble, or combinations thereof.

### Claim 14

A computer program product, comprising:
a tangible computer readable storage medium, said computer readable storage medium comprising computer readable program code embodied therewith, said computer readable program code comprising:
computer readable program code to receive measurements from a drive bubble detection system; and
computer readable program code to modify a program that runs said bubble detection system.

### Claim 15 (depends on 14)

The computer program product of claim 14, wherein said computer readable program code to modify a program that runs said bubble detection system includes inputting into said program an adjusted bubble formation time or an adjusted bubble collapse time.