US 11,981,131 B2
Print element substrate and temperature detection apparatus
Hideo Kanno, Kanagawa (JP); and Nobuyuki Hirayama, Kanagawa (JP)
Assigned to CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on May 31, 2022, as Appl. No. 17/828,774.
Claims priority of application No. 2021-093618 (JP), filed on Jun. 3, 2021.
Prior Publication US 2022/0388302 A1, Dec. 8, 2022
Int. Cl. B41J 2/045 (2006.01)
CPC B41J 2/04563 (2013.01) [B41J 2/0455 (2013.01); B41J 2/0458 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A print element substrate comprising:
a plurality of print elements configured to generate thermal energy for ejecting liquid; and
a temperature detection element circuit including a plurality of temperature detection elements provided corresponding to each of the plurality of print elements, configured to read temperature information by selectively energizing one of the plurality of temperature detection elements,
wherein the temperature detection element circuit includes:
a signal processing portion configured to output a selection signal having a second voltage amplitude larger than a first voltage amplitude, based on an input signal having the first voltage amplitude;
a selection switch provided for each of the plurality of temperature detection elements, configured to select the temperature detection element; and
a first read switch provided for each of the plurality of temperature detection elements, configured to read a voltage of a terminal of one of the temperature detection element selected by the selection switch, and
wherein the selection switch and the first read switch are driven by using the selection signal.