Title:
METHOD OF COMPENSATION FOR THE EFFECTS OF THERMALLY-INDUCED DROPLET SIZE VARIATIONS IN INK-JET PRINTERS
Document Type and Number:
WIPO Patent Application WO2000030855
Kind Code:
A3
Abstract:
An apparatus and method is provided for compensating for the effects of thermally induced droplet size variations in ink-jet printers. The apparatus includes a temperature determination unit (28) for determining the temperature of the print head, and a halftone adjustment unit (18) configured to receive the print head (32) temperature from the temperature determination unit (28) and to receive image data in the form of nominal halftone values. The adjustment unit (18) can increase or decrease the number of dots to be printed, and thereby compensate for droplet size variations, either by adjusting the nominal halftone values based upon the temperature or by adjusting a threshold array based upon the temperature. The temperature determination unit (28) can predict the print head (32) temperature by counting the number of dots to be printed by counting the binary halftone values fed to the swath memory.
Inventors:
CORNELL ROBERT WILSON
HEYDINGER SCOTT MICHAEL
POWERS JAMES HAROLD
HEYDINGER SCOTT MICHAEL
POWERS JAMES HAROLD
Application Number:
PCT/US1999/027004
Publication Date:
November 23, 2000
Filing Date:
November 12, 1999
Export Citation:
Assignee:
LEXMARK INT INC (US)
International Classes:
B41J2/01; B41J2/05; B41J2/205; B41J2/21; H04N1/407; H04N1/40; (IPC1-7): B41J29/38
Foreign References:
| US5646655A | 1997-07-08 | |||
| US6027196A | 2000-02-22 | |||
| US4910528A | 1990-03-20 | |||
| US5903289A | 1999-05-11 |
Other References:
See also references of EP 1133396A4
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