# US 7,607,747 B2 · Printing device, printing device control program, printing device control method, printing data producing device, printing data producing program, printing data producing method, correction information producing method, and correction information producing device

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 7,607,747 B2
- Document ID: US7607747B2
- Status: Granted
- Kind: B2
- Application number: 11/359,905
- Filed: 2006-02-22
- Published: 2006-08-24
- Granted: 2009-10-27
- Earliest claimed: 2005-02-24
- Assignees: Seiko Epson Corporation
- Inventors: Toshio Tanaka; Hitoshi Yamakado
- Web page: https://patentgrep.com/patent/US7607747B2

## CPC

- B41J 2/2128: {by means of energy modulation (control methods or devices therefor, e.g. driver circuits or control circuits B41J2/04501)}
- B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS

## Abstract

A printing device includes a printing head having arranged printing elements capable of forming dots on a medium used for printing. The printing device prints an image by forming dots on the medium by the printing head. The printing device includes a printing control unit that controls the printing processing so that a line graph representing the density change characteristic of a printing result by the printing head draws a line with a gradient.

## Claims

### Claim 1

A printing device including a printing head having a plurality of printing elements arranged generally in a line to form an image on a medium, the printing device comprising:
an image data obtaining unit that obtains image data including pixel data corresponding to a plurality of pixels forming the image;
a correction information storage unit that stores correction information, the correction information being based on a density change of dots formed by the printing head for pixel data having the same value in the line of the printing elements, the correction information also being used for correcting density variations in the direction along the line, between dots printed by the printing elements;
a printing data producing unit that produces printing data corresponding to the image data; and
a printing unit that prints the image on the medium by the printing head based on the printing data,
the printing data producing unit producing printing data based on the image data and the correction information so that the density of dots, printed by the printing elements, varies continuously across adjacent printing elements along the entire line of printing elements substantially according to at least one of a linear, quadratic, and elliptical function.

### Claim 2 (depends on 1)

The printing device according to claim 1, further comprising a plurality of the printing heads, wherein printing elements corresponding to pixel data having the same value are among the plurality of the printing heads, and the printing data producing unit produces such printing data so that the density of dots, printed by the printing elements of said plurality of printing heads varies substantially according to at least one of a linear, quadratic, and elliptical function.

### Claim 3

A printing data producing device that produces printing data for use in a printing device including a printing head having a plurality of printing elements arranged in a line to form an image on a medium, the device comprising:
an image data obtaining unit that obtains image data including pixel data corresponding to a plurality of pixels forming the image;
a correction information storage unit that stores correction information, the correction information being based on a density change of dots formed by the printing head for pixel data having the same value in the line of the printing elements, the correction information also being used for correcting density variations in the direction along the line, between dots printed by the printing elements; and
a printing data producing unit that produces printing data corresponding to the image data,
the printing data producing unit producing printing data based on the image data and the correction information so that the density of dots, printed by the printing elements, varies continuously across adjacent printing elements along the entire line of printing elements substantially according to at least one of a linear, quadratic, and elliptical function.