Patent ID: 11904605
Assignee: SEIKO EPSON CORPORATION
Field: Textile and paper machines (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A head unit having a first driving element group driven by a first driving signal and discharging a liquid in response to drive of the first driving element group, comprising:
a substrate that propagates the first driving signal;
a first driving circuit disposed on the substrate and outputting the first driving signal;
a heat sink fixed to the substrate; and
a plurality of heat conductive elastic bodies positioned between the substrate and the heat sink, wherein
the first driving circuit includes a first integrated circuit that outputs a first gate signal based on a first reference driving signal that is a reference of the first driving signal, a first amplifier circuit including a first transistor driven by the first gate signal, and a first smoothing circuit that smoothes output from the first amplifier circuit and outputs the first driving signal,
the substrate includes a fixing section to which the heat sink is fixed,
a first heat conductive elastic body among the plurality of heat conductive elastic bodies is positioned between the heat sink and the first integrated circuit, and is in contact with the heat sink and the first integrated circuit,
a second heat conductive elastic body among the plurality of heat conductive elastic bodies is positioned between the heat sink and the first transistor, and is in contact with the heat sink and the first transistor,
a length of the first transistor in a normal direction of the substrate is different from a length of the first integrated circuit in the normal direction,
lengths of the first heat conductive elastic body and the second heat conductive elastic body in the normal direction before the heat sink is fixed to the substrate are longer than lengths of the first heat conductive elastic body and the second heat conductive elastic body in the normal direction after the heat sink is fixed to the substrate, and
the first heat conductive elastic body and the second heat conductive elastic body are in a form of a gel having flame retardancy and electric insulation property.