| US 7,575,294 B2 | ||
| Printhead substrate, printhead using the substrate, head cartridge including the printhead, method of driving the printhead, and printing apparatus using the printhead | ||
| Yoshiyuki Imanaka, Kanagawa (Japan); Teruo Ozaki, Kanagawa (Japan); Takuya Hatsui, Tokyo (Japan); Takaaki Yamaguchi, Kanagawa (Japan); Ichiro Saito, Kanagawa (Japan); Muga Mochizuki, Kanagawa (Japan); and Toshiyasu Sakai, Kanagawa (Japan) | ||
| Assigned to Canon Kabushiki Kaisha, Tokyo (Japan) | ||
| Filed on Mar. 23, 2007, as Appl. No. 11/690,561. | ||
| Application 11/690561 is a division of application No. 10/980300, filed on Nov. 04, 2004, granted, now 7,216,960, filed on May 15, 2007. | ||
| Claims priority of application No. 2003-377258 (JP), filed on Nov. 06, 2003; and application No. 2003-377262 (JP), filed on Nov. 06, 2003. | ||
| Prior Publication US 2007/0188559 A1, Aug. 16, 2007 | ||
| Int. Cl. B41J 29/38 (2006.01); H01L 27/105 (2006.01) | ||
| U.S. Cl. 347—12 [347/59; 257/204] | 14 Claims |
| 1. A printhead substrate having a plurality of printing elements, and driving elements, which are arranged in correspondence
with the plurality of printing elements, switch and control driving of corresponding printing elements, and are formed from
MOS transistors, comprising:
a common wiring line which commonly supplies power, and to which a plurality of simultaneously drivable printing elements
out of the plurality of printing elements are connected;
a first pad which supplies power to said common wiring line;
a logic circuit which controls the plurality of driving elements;
a GND wiring line which corresponds to said common wiring line and is shared over a plurality of blocks; and
a second pad which connects to said GND wiring line,
wherein each of the driving elements is an element for supplying a constant current to the corresponding printing element,
and
the plurality of printing elements are connected to said common wiring line such that resistance values from each of the plurality
of printing elements to said common wiring line are substantially equal to each other.
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