Printer and print head unit for same

• US 6,478,399 B1
• Filed: 05/01/2000
• Issued: 11/12/2002
• Est. Priority Date: 08/31/1998
• Status: Expired due to Term

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Kanaya, Munehide, Mitsuzawa, Toyohiko
• Primary Examiner(s): HALLACHER, CRAIG ALAN
• Application Number:
  US09/562,471
• Time in Patent Office: 925 Days
• Field of Search: 347/19, 347/15, 347/37, 400/74
• US Class Current: 347/19
• CPC Class Codes: B41J 2/17546 electronically
• CPC Class Codes: B41J 2/17566 Ink level or ink residue control
• CPC Class Codes: B41J 2202/17 Readable information on the head

Abstract

A print head unit is provided with preset head identification information that is based on variations in print head unit characteristics arising in the course of manufacturing the print head unit. The printer executes printing processing in accordance with printing processing parameters that are determined on the basis of the head identification information.

Claims

1. A printing apparatus that prints using a print head unit comprising a print head having a plurality of nozzles for ejecting ink droplets, wherein

the print head unit is provided with readable head identification information that is predetermined based on variations in print head unit characteristics caused by fabrication error of the print head unit, and

the printing apparatus comprises:

a control section that executes printing process in accordance with printing process parameters determined according to the head identification information;

a print mode memory for storing a plurality of dot printing modes each selectively applicable to the print head unit, the plurality of dot printing modes having substantially the same printing speeds at substantially the same printing resolution, the dot printing mode defining a scanning method used during printing effected by forming dots; and

wherein the head identification information further includes printing mode information for specifying a preferable dot printing mode from among the plurality of dot printing modes, the preferable dot printing mode being selected according to the print head unit characteristics.

2. A printing apparatus according to claim 1, wherein the head identification information is stored in a non-volatile memory provided on the print head unit.

3. A printing apparatus according to claim 2, wherein the print head unit comprises the non-volatile memory having a memory area storing print head unit service history information.

4. A printing apparatus according to claim 1, wherein the head identification information is displayed on a surface of the print head unit.

5. A printing apparatus according to claim 1, further comprising a plurality of the print head units;

and

wherein the head identification information is readably provided on each print head unit.

6. A printing apparatus according to claim 1, comprising:

means for writing print head unit service history information into the non-volatile memory.

7. A print head unit for use in a printing apparatus having a print mode memory for storing a plurality of dot printing modes each selectively applicable to the print head unit, the plurality of dot printing modes having substantially the same printing speeds at substantially the same printing resolution, the dot printing mode defining a scanning method used during printing effected by forming dots, wherein

the print head unit is provided with readable head identification information that is predetermined based on variations in print head unit characteristics caused by fabrication error of the print head unit, the head identification information including printing mode information for specifying a preferable dot printing mode from among the plurality of dot printing modes, the preferable dot printing mode being selected according to the print head unit characteristics.

8. A print head according to claim 7, comprising a non-volatile memory having a memory area storing print head unit service history information.

9. A print head unit according to claim 7, wherein the head identification information is displayed on a surface of the print head unit.

10. A printing apparatus that prints dots on a print medium, comprising:

a print head that includes a plurality of dot formation elements for forming dots on the print medium;

a main scanning drive section that at least relatively moves the print head and the print medium for main scanning;

a head drive section that drives at least a portion of the plurality of dot formation elements to form dots during main scanning;

a sub-scanning drive section that at least relatively moves the print head and the print medium for sub-scanning; and

a control section for controlling printing,

wherein the control section includes;

a printing mode storage section for storing a plurality of dot printing modes each defining the main and sub-scanning operations for printing dots and each being selectively applicable to the print head, and

a mode selection information setting section for specifying a preferable printing mode from among the plurality of dot printing modes, the preferable printing mode being determined based on variations in print head characteristics caused by fabrication error of the print head,

wherein the control section executes printing according to the dot printing mode specified by the mode selection information; and

wherein the printing modes with respect to at least one print resolution are divided into a plurality of printing mode groups having mutually different printing speeds, and the plurality of printing mode groups pertaining to said at least one print resolution are arranged so that the number of dot printing modes included in a group increases as its printing speed decreases.

11. A printing apparatus according to claim 10, wherein the mode selection information setting section has mode selection data that specifies a dot printing mode for each printing mode group having a different combination of print resolution and printing speed.

12. A method of operating a print head unit, comprising:

storing a plurality of dot printing modes each selectively applicable to the print head unit, the plurality of dot printing modes having substantially the same printing speeds at substantially the same printing resolution, the dot printing mode defining a scanning method used during printing effected by forming dots;

providing readable head information on the print head unit that is predetermined based on variations in print head unit characteristics caused by fabrication error of the print head unit, the information including printing mode information for specifying a preferable dot printing mode from among the plurality of dot printing modes, the preferable dot printing mode being selected according to the print head unit characteristics;

reading the information; and

executing printing in accordance with the head identification information.

13. A method according to claim 12, comprising:

providing the information for each of a plurality of print heads;

executing printing for each of the print heads according to the respective information.

14. A printing apparatus that prints using a print head unit, wherein

the print head unit is provided with readable head identification information that is predetermined based on variations in print head unit characteristics arising during manufacture of the print head unit,

the printing apparatus comprises a print mode memory for storing a plurality of dot printing modes each selectively applicable to the print head unit, the dot printing mode defining a scanning method used during printing effected by forming dots, and a control section that executes printing process in accordance with printing process parameters determined according to the head identification information and said dot printing modes.

15. A print head unit for use in a printing apparatus having a print mode memory for storing a plurality of dot printing modes each selectively applicable to the print head unit, the plurality of dot printing modes having substantially the same printing speeds at substantially the same printing resolution, the dot printing mode defining a scanning method used during printing effected by forming dots, wherein

the print head unit is provided with readable head identification information that is predetermined based on variations in print head unit characteristics arising during manufacture of the print head unit and printing mode information for specifying a preferred printing mode, the head identification information including printing mode information for specifying a preferable dot printing mode from among the plurality of dot printing modes, the preferable dot printing mode being selected according to the print head unit characteristics.