# US 9,519,848 B2 · Calibration target

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- Number: US 9,519,848 B2
- Document ID: US9519848B2
- Status: Granted
- Kind: B2
- Application number: 14/787,409
- Filed: 2013-07-23
- Published: 2016-03-24
- Granted: 2016-12-13
- Earliest claimed: 2013-07-23
- Assignees: Hewlett-Packard Development Company, L.P.
- Applicants: Hewlett-Packard Development Company, L.P.
- Inventors: Peter Morovic; Jan Morovic; Montserrat Solano Pallarol; Marti Rius Rossell; Juan Manuel Garcia Reyero Vinas
- Web page: https://patentgrep.com/patent/US9519848B2

## CPC

- G06K 15/027: {Test patterns and calibration (arrangements for controlling or analysing printing mechanisms of typewriters or selective printing units B41J29/393 takes precedence; colour correction using test pattern analysis in general H04N1/6033)}
- B41J 2/2146: {for line print heads}
- B41J 29/38: Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
- B41J 29/393: Devices for controlling or analysing the entire machine {; Controlling or analysing mechanical parameters involving printing of test patterns}
- G06F 3/12: Digital output to print unit {, e.g. line printer, chain printer}
- H04N 1/6008: {with primary colour signals, e.g. RGB or CMY(K)}
- H04N 1/6038: {for controlling interaction among colorants}
- H04N 1/605: {for controlling ink amount, strike-through, bleeding soakage or the like}
- G06K 2215/0094: Colour printing
- G06K 2215/101: involving the use of ink jets
- G06K: GRAPHICAL DATA READING (image or video recognition or understanding G06V); PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

A calibration target is disclosed. The calibration target is created such that a color patch is sensitive to drop weight changes.

## Claims

### Claim 1

A printer, comprising:
a print bar with a mount for at least one die;
a processor to control the printer, the processor coupled to the mount for the at least one die;
a memory coupled to the processor, the memory having a calibration module loaded therein,
the calibration module, when executed by the processor, causing the printer to print a calibration target using the at least one die when the die is mounted on the print bar; and
the calibration target having at least one patch of a known color, the known color created from a proportional coverage of primaries that is most sensitive to drop weight changes based on the largest measured color difference between two patches of the same known color printed using a pair of pens to print a large set of samples for each known color.

### Claim 2 (depends on 1)

The printer of claim 1, wherein the proportional coverage of primaries is an NPac selected from a plurality of NPacs that result in the same known color.

### Claim 3 (depends on 1)

The printer of claim 1, wherein the proportional coverage of primaries is a color vector selected from a plurality of color vectors that result in the same known color.

### Claim 4 (depends on 1)

The printer of claim 1, where the proportional coverage of primaries will have a color change of at least one dE for a given change in drop weight.

### Claim 5 (depends on 4)

The printer of claim 4, where the given change in drop weight is between 1% and 20%.

### Claim 6 (depends on 1)

The printer of claim 1, wherein the printer uses only three colors of ink.

### Claim 7 (depends on 1)

The printer of claim 1, further comprising:
a mount for a plurality of dies on the print bar; and
where each of the plurality of dies, when mounted on the print bar, prints the calibration target.

### Claim 8 (depends on 1)

The printer of claim 1, wherein the at least one die has a first end and a second end opposite the first end, and where the calibration target is printed at both the first end and the second end of the at least one die.

### Claim 9

A non-transitory computer readable medium comprising a calibration module, that when executed by a processor, prints a calibration target, comprising:
a plurality of known colors where each of the plurality of known colors is created from a proportional coverage of primaries that is most sensitive to drop weight changes based on the largest measured color difference between two patches of the same known color printed using a pair of pens to print a large set of samples for each known color.

### Claim 10 (depends on 9)

The non-transitory computer readable medium of claim 9, where each of the proportional coverage of primaries will have a color change of at least one dE for a given change in drop weight.

### Claim 11 (depends on 9)

The non-transitory computer readable medium of claim 9, where given change in drop weight is between 1% and 20%.

### Claim 12 (depends on 9)

The non-transitory computer readable medium of claim 9, where each of the proportional coverage of primaries is an NPac.

### Claim 13 (depends on 9)

The non-transitory computer readable medium of claim 9, where the calibration target is printed by each die in a printer.

### Claim 14 (depends on 9)

The non-transitory computer readable medium of claim 9, where the calibration target is printed by each end of each die in a printer.

### Claim 15

A method for printing a calibration target, comprising:
printing a plurality of known colors with each die in a printer where each of the plurality of known colors is created from a proportional coverage of primaries that is most sensitive to drop weight changes based on the largest measured color difference between two patches of the same known color printed using a pair of pens to print a large set of samples for each known color.