Printhead substrate, printhead, head cartridge, and printing...

Details Printhead substrate, printhead, head cartridge, and printing... Printhead substrate, printhead, head cartridge, and printing...

2004-05-27

2009-10-06

Luu, Matthew (Department: 2861)

Incremental printing of symbolic information

Ink jet

Ejector mechanism

C347S010000, C347S044000

Reexamination Certificate

active

07597424

ABSTRACT:
An object of this invention is to implement higher-quality printing at a higher speed by changing an electric current value to a printing element and adjusting energy applied to the printing element in an inkjet printhead. To achieve this object, a current regulating circuit is arranged on the head substrate of an inkjet printhead of a constant electric current driving type which supplies a constant electric current to a heater. The electric current value is changed in accordance with a signal (digital signal etc.) supplied from the outside of the printhead. Energy corresponding to the electric current value is applied to the printing element from a constant electric current source corresponding to each group.

REFERENCES:
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patent: 5517229 (1996-05-01), Gunther
patent: 5886713 (1999-03-01), Okada et al.
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patent: 2003-058264 (2003-02-01), None
patent: 200358264 (2006-02-01), None
Patent Abstracts of Japan, vol. 2000, No. 24, May 11, 2001 (corresponds to JP 2001-191531).

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