The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 24, 2006
Filed:
Nov. 14, 2002
Yoshiyuki Imanaka, Kanagawa, JP;
Ichiro Saito, Kanagawa, JP;
Yoshinori Misumi, Tokyo, JP;
Hidehiko Kanda, Kanagawa, JP;
Muga Mochizuki, Kanagawa, JP;
Takaaki Yamaguchi, Kanagawa, JP;
Yoshiyuki Imanaka, Kanagawa, JP;
Ichiro Saito, Kanagawa, JP;
Yoshinori Misumi, Tokyo, JP;
Hidehiko Kanda, Kanagawa, JP;
Muga Mochizuki, Kanagawa, JP;
Takaaki Yamaguchi, Kanagawa, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
The invention intends to maintain a constant ink discharge amount among the recording heads, even in case a total pulse width of pulse voltages applied to heat generating resistors. For this purpose, a rank table is prepared in such a manner, even in a situation where a total pulse width of the pulses applied to the heat generating resistor is 3 μs or less whereby the ink discharge amount decreases with a decrease in the total pulse width, that a maximum reached temperature on the surface of the heat generating resistors at the application of a preheat pulse becomes higher with a decrease in the resistance of a rank resistor, and a pulse width Pon the rank table is made longer thereby compensating a decrease in the ink discharge amount with a decrease in the total pulse width and maintaining a constant ink discharge amount.