US 12,138,914 B2
Liquid discharge device and head drive circuit
Yoichiro Kondo, Chino (JP)
Assigned to SEIKO EPSON CORPORATION, (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Aug. 30, 2022, as Appl. No. 17/898,569.
Claims priority of application No. 2021-140975 (JP), filed on Aug. 31, 2021.
Prior Publication US 2023/0060778 A1, Mar. 2, 2023
Int. Cl. B41J 29/38 (2006.01); B41J 2/045 (2006.01)
CPC B41J 2/04541 (2013.01) [B41J 2/04581 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A liquid discharge device comprising:
a discharge head that includes a first discharge portion group having a first piezoelectric element and a first discharge portion discharging a liquid in response to a drive of the first piezoelectric element, and a second discharge portion group having a second piezoelectric element and a second discharge portion discharging a liquid in response to a drive of the second piezoelectric element;
a substrate configured with a plurality of layers, every two adjacent layers of the plurality of layers are stacked with an insulating layer therebetween, the plurality of layers including first and second layers;
a first drive circuit, a second drive circuit, a third drive circuit, and a fourth drive circuit arranged side by side along one direction of the substrate; and
a connector provided on the substrate and that electrically couples the substrate and the discharge head, wherein
the first drive circuit outputs a first drive signal for driving the first piezoelectric element so that the first discharge portion discharges a liquid having a first discharge amount,
the second drive circuit outputs a second drive signal for driving the first piezoelectric element so that the first discharge portion does not discharge a liquid,
the third drive circuit outputs a third drive signal for driving the second piezoelectric element so that the second discharge portion discharges a liquid having a second discharge amount,
the fourth drive circuit outputs a fourth drive signal for driving the second piezoelectric element so that the second discharge portion does not discharge a liquid,
the connector propagates the first drive signal, the second drive signal, the third drive signal, and the fourth drive signal to the discharge head,
the substrate includes:
a first wiring that electrically couples between the first drive circuit and the connector, propagates the first drive signal, and is formed in the first layer;
a second wiring that electrically couples between the second drive circuit and the connector, propagates the second drive signal, and is formed in the second layer;
a third wiring that electrically couples between the third drive circuit and the connector, propagates the third drive signal, and is formed in the first layer; and
a fourth wiring that electrically couples between the fourth drive circuit and the connector, propagates the fourth drive signal, and is formed in the second layer,
the first wiring is shorter than the second wiring, the third wiring, and the fourth wiring, and
the fourth wiring is longer than the first wiring, the second wiring, and the third wiring.