A liquid ejecting head includes: a plurality of head chips having nozzles; a holder holding the plurality of head chips; and a planar heater disposed on the holder and heating the holder, in which the heater includes an outer peripheral region along an outer edge of the holder and a middle region positioned inside the outer peripheral region in a plan view, and a heat generation amount per unit time of the outer peripheral region is larger than a heat generation amount per unit time of the middle region.

A liquid ejecting head includes a first drive circuit including a switching element that selects, from a plurality of drive elements, a drive element to which a drive signal for ejection of liquid through a nozzle is sent, a case defining a first accommodating portion that is a space accommodating the first drive circuit, and a first gas supply passage that is in communication with the first accommodating portion and through which gas is supplied to the first accommodating portion.

A liquid discharge head is provided in which heat of a heat sink is less apt to transfer to a head body. The liquid discharge head includes a head body 2a having a discharge hole for discharging a liquid therethrough, a driver IC 93 configured to control driving of the head body 2a, a casing 91 which is disposed on the head body 2a and has openings 91a and 91b on a side surface of the casing, and a heat sink 90 which is disposed on the openings 91a and 91b of the casing 91 and configured to dissipate heat generated in the driver IC 93, and a thermal insulation part 91e disposed between the heat sink 90 and the head body 2a. This makes it possible to reduce the likelihood that the heat of the heat sink 91e transfers to the head body 2a.

A piezoelectric element in which a first electrode, a piezoelectric layer, and a second electrode are stacked on a substrate is provided. The piezoelectric element is a piezoelectric element in which the first electrode, the piezoelectric layer, and the second electrode are stacked in order on the substrate and includes an orientation control layer that is provided between the piezoelectric layer and the first electrode and that controls orientation of the piezoelectric layer and a titanium layer that is provided between the first electrode and the orientation control layer and that contains at least Ti.

A liquid discharge device including a discharge head, a head drive circuit that outputs a first drive signal, and a second drive signal, and a coupling member includes a first wiring that propagates the first drive signal, a second wiring that propagates the second drive signal, a third wiring that propagates a reference voltage signal, and a base material provided with the first wiring, the second wiring, and the third wiring, in which the first wiring and the second wiring are provided on a first surface of the base material, the third wiring is provided on a second surface different from the first surface of the base material, and at least one of the first wiring and the second wiring is located so as to overlap with at least a part of the third wiring in a first direction along a direction from the first surface to the second surface.

The control section sets, as a first flow rate, a flow rate of the liquid, which is circulated by the circulating mechanism, per unit time, during an ejection operation of ejecting the liquid from the liquid ejecting head. The control section sets, as a second flow rate greater than the first flow rate, a flow rate of the liquid, which is circulated by the circulating mechanism, per unit time, during a recovery operation of recovering a state of the liquid ejecting head.

A liquid ejecting head includes: a plurality of individual flow channels provided with nozzles; a common supply flow channel through which a liquid is supplied to the plurality of individual flow channels; a common discharge flow channel through which the liquid is discharged from the plurality of individual flow channels; and a bypass flow channel that bypasses the plurality of individual flow channels and causes the common supply flow channel and the common discharge flow channel to communicate with each other. A combined flow channel resistance of the bypass flow channel and the plurality of individual flow channels is greater than a flow channel resistance of the common supply flow channel and is greater than a flow channel resistance of the common discharge flow channel.

A piezoelectric device includes a substrate, a diaphragm; and a piezoelectric actuator, in which the substrate, the diaphragm, and the piezoelectric actuator are laminated in this order in a first direction, the diaphragm includes a first layer containing silicon as a constituent element, a third layer disposed between the first layer and the piezoelectric actuator and containing zirconium as a constituent element, and a second layer disposed between the first layer and the third layer and containing at least one impurity element selected from the group consisting of a metal, a metalloid, and a semiconductor other than silicon and zirconium, as a constituent element, and the impurity element diffuses into the third layer.

The diaphragm includes a first layer containing silicon as a constituent element, a third layer disposed between the first layer and the piezoelectric actuator and containing zirconium as a constituent element, and a second layer disposed between the first layer and the third layer and containing at least one selected from the group consisting of a metal other than iron, silicon, and zirconium, a metalloid, and a semiconductor, as a constituent element, in the second layer and the third layer, a position with a highest concentration of impurities other than the constituent elements of the second layer and the third layer is in the second layer, a position with a highest concentration of zirconium is in the third layer, and a position with a highest concentration of silicon is in the first layer.

There is provided a liquid discharge apparatus including: a conveyer; head chips; a circulation channel; and a controller. Each head chip includes a manifold; a nozzle group, and actuators. Each head chip is configured to execute discharge drive and non-discharge vibration drive. The head chips include: an end head chip; a facing head chip facing the recording medium; and a non-facing head chip not facing the recording medium. The controller is configured to make at least one of a circulation flowing amount of a liquid in the circulation channel in the facing head chip and a frequency of the non-discharge vibration drive by an actuator included in the actuators in the facing head chip larger than those of the non-facing head chip.