Patent ID: 9616660
Date: 2017-04-11
CPC Classifications: B41J,H05K

Claim:
1. A liquid ejection device comprising a switching circuit, the switching circuit including: a multilayer wiring board including a first wiring layer and a second wiring layer; a first transistor and a second transistor mounted on the first wiring layer side of the multilayer wiring board; and a capacitor mounted on the second wiring layer side of the multilayer wiring board, wherein the multilayer wiring board includes a drain electrode of the first transistor is electrically connected with the first wire, a source electrode of the first transistor is electrically connected with the second wire, a drain electrode of the second transistor is electrically connected with the second wire, a source electrode of the second transistor is electrically connected with the third wire, a first electrode of the capacitor is electrically connected with the fourth wire, a second electrode of the capacitor is electrically connected with the fifth wire, and when the multilayer wiring board is viewed in a plan view no via conductor electrically connects the second wire and the sixth wire in an area overlapping a straight-line path connecting the source electrode of the first transistor with the drain electrode of the second transistor in the second wire, wherein the multilayer wiring board further includes an eighth wire formed in the first wiring layer, a gate electrode of the second transistor is electrically connected with the eighth wire, and when the multilayer wiring board is viewed in the plan view, the fifth wire and the eighth wire are formed at positions where at least a portion of the fifth wire and at least a portion of the eighth wire overlap each other.