The width by which the first, second heads overlap each other cross-sectionally along the first direction is greater than the width by which the fifth, sixth heads overlap each other cross-sectionally along the first direction.

A liquid ejecting head includes an ejection surface including head chips, and a first-positioning-portion and a second-positioning-portion disposed in a second-direction orthogonal to a first-direction with respect to the ejection surface and positioning a holding member, the liquid ejecting head has a first-edge and a second-edge separated from each other in the first-direction and extending along a third-direction parallel to the ejection surface and inclined with respect to the first-direction and the second-direction, and one end portion and the other end portion forming both end portions in the second-direction, and the first-positioning-portion does not overlap a virtual parallelogram having a first-virtual side contacting the first-edge and extending along the third-direction, a second-virtual side contacting the second-edge and extending along the third-direction, a third-virtual side contacting the one end portion and extending along the first-direction, and a fourth-virtual side contacting the other end portion and extending along the first-direction.

A head includes an upper surface opposite from an ejection surface; and an electrical coupling portion disposed at a first-end portion of the upper surface in a Y-direction, an outer shape of the upper surface has first and second edges separated from each other in an X-direction, a third-edge disposed at the first-end portion, and a fourth-edge disposed at a second-end portion opposite from the first-end portion in the Y-direction, along a V-direction, and when viewed in a normal direction, the upper surface is not overlapped with an acute-angled portion of a virtual parallelogram having a first-virtual side contacting the first-edge, a second-virtual side contacting the second-edge, a third-virtual side contacting the third-edge, and a fourth-virtual side contacting the fourth-edge, and projects beyond an obtuse-angled portion of the virtual parallelogram in the X-direction.

a≥b≥0, p≥1, q≥1, where a is a number of pairs each consisting of two adjacent first head units, b is a number of pairs each consisting of two adjacent second head units, p is a number of first head units, and q is a number of second head units.

An inkjet printhead includes: a fluid manifold having a base defining a plurality of fluid outlets and printhead chips attached to the base. Each printhead chip receives printing fluid from a set of the fluid outlets. All fluid outlets are flared with a respect to a width dimension of the printhead chips for facilitating removal of air bubbles.

There are provided a substrate on which a first integrated circuit, a first transistor, and a first inductor element are disposed, and which has a first side and a second side facing each other; a heat sink having a fifth side and a sixth side along the first side; the first integrated circuit, the first transistor, and the first inductor element are positioned in order of the first integrated circuit, the first transistor, and the first inductor element from the first side toward the second side, and the heat sink is fixed to the substrate such that a shortest distance between the fifth side and the first side is shorter than a shortest distance between the sixth side and the first side, and a shortest distance between the first integrated circuit and the fifth side is longer than a shortest distance between the first transistor and the sixth side.

There are provided a first fixing section to a third fixing section that fix a heat sink to a substrate on which a first driving circuit and a second driving circuit are disposed; the first drive circuit includes first transistor and first integrated circuit, and the second drive circuit includes second transistor and second integrated circuit, lengths of the first transistor and the second transistor in the normal direction of the substrate are longer than lengths of the first integrated circuit and the second integrated circuit, the first fixing section and the second fixing section overlap a first virtual straight line that connects the first transistor and the second transistor, and the third fixing section overlaps a second virtual straight line that connects the first integrated circuit and the second integrated circuit to each other.

There are provided a substrate on which a first integrated circuit, a first transistor, a second integrated circuit, and a second transistor are disposed; a heat sink fixed to the substrate; a first heat conductive elastic body which is in contact with the heat sink and the first integrated circuit; a second heat conductive elastic body which is in contact with the heat sink and the first transistor; a third heat conductive elastic body which is in contact with the heat sink and the second integrated circuit; and a fourth heat conductive elastic body which is in contact with the heat sink and the second transistor, the heat sink has a first recess portion positioned between the first heat conductive elastic body and the second heat conductive elastic body, and a second recess portion positioned between the third heat conductive elastic body and the fourth heat conductive elastic body.

There are provided a substrate on which a first integrated circuit, a first transistor, a second integrated circuit, and a second transistor are disposed; a heat sink fixed to the substrate; the substrate has a first fixing reference hole and a second fixing reference hole, the heat sink has a first fixing reference pin and a second fixing reference pin which are inserted into the first fixing reference hole and the second fixing reference hole, and the first integrated circuit, the second integrated circuit, the first transistor, and the second transistor are positioned between the first fixing reference hole and the second fixing reference hole.

A printing apparatus includes a head unit having a support portion configured to support a plurality of heads capable of discharging a droplet in a discharge direction, and a carriage on which the head unit is removably mounted from upstream in the discharge direction, wherein the carriage has a bottom formed with an opening from which a nozzle surface of the head for discharging the droplet is exposed, the support portion is provided with at least one protruding portion protruding from a bottom surface of the support portion in the discharge direction, and the bottom is provided with an insertion hole through which the at least one protruding portion is inserted, and a biasing member biasing the support portion in an intersecting direction intersecting with the discharge direction in a state where the at least one protruding portion is inserted through the insertion hole.