A method for manufacturing a bonded substrate, the method includes: bonding a first mother substrate including a first substrate and a second mother substrate including a second substrate to form a bonded mother substrate; cutting off a part of the first mother substrate along a dividing line of the bonded mother substrate to form a cutoff portion; dividing the bonded mother substrate along the dividing line; separating a bonded substrate from the bonded mother substrate, the bonded substrate including the first substrate and the second substrate bonded to the first substrate; forming a contact terminal on an end portion of the first mother substrate, the contact terminal contactable with an external terminal; forming a communication path between the first mother substrate and the second mother substrate along the dividing line.

A print head drive circuit drives a print head including an ejecting portion ejecting a liquid in response to a drive signal propagating through a drive signal line and a storage portion storing ejecting portion-related information changing in accordance with use of the ejecting portion, in which processing of reading the ejecting portion-related information changing in accordance with the use from the storage portion is performed before the drive signal for ejecting the liquid from the ejecting portion is supplied to the print head.

A liquid discharge head to discharge a liquid includes a piezoelectric body, a first electrode layer disposed at least partly on the piezoelectric body in a stacking direction, and a first wiring disposed on the first electrode layer in the stacking direction, the first wiring being more likely to cause ion migration than the first electrode layer, in which the piezoelectric body, the first electrode layer, and the first wiring are stacked in the stacking direction. When a predetermined area on the piezoelectric body is a first area, and a predetermined area adjacent to the first area on the piezoelectric body is a second area, both the first wiring and the first electrode layer are disposed in the first area, and the first wiring is not disposed while the first electrode layer is disposed in the second area.

A liquid ejecting head includes a first sidewall, a second sidewall, and head chips. The head chips are arranged side by side between the first sidewall and the second sidewall. Each of the head chips has nozzles configured to discharge a liquid. The first sidewall is formed by a portion of a holder from which the liquid is to be supplied to the head chips, whereas the second sidewall is formed by a portion of a fixed plate to which the head chips are fixed. The fixed plate has an aperture through which the nozzles are exposed.

The piezoelectric material has, when viewed in the stacking direction, a first region including a border between an end of the active portion and the non-active portion in an extending direction of the individual electrode, the piezoelectric material has a second region different from the first region, and the piezoelectric material in the first region is thicker than the piezoelectric material in the second region.

A liquid ejecting head includes: a pressure chamber substrate; and a communication plate, in which the pressure chamber substrate includes a first pressure chamber that extends in a first direction and applies pressure to a liquid, and a first supply channel, and the communication plate includes a first communication channel that extends in a second direction intersecting with the first direction and communicates with the first supply channel, and a second supply channel that communicates with the first supply channel and the first pressure chamber.

An inkjet head driving method includes applying a voltage signal having a combined drive waveform that includes unit drive waveforms to a pressure generator and causing a nozzle to jet ink droplets such that the droplets land on a medium as one droplet. Each unit drive waveform includes a first pulse waveform for jetting a droplet and a second pulse waveform for pulling back the jetted droplet. The first and second pulse waveforms each include an expansion part for expanding a pressure chamber and a following contraction part for contracting the chamber. The combined drive waveform includes a first unit drive waveform and a following second unit drive waveform. A voltage amplitude of the contraction part of the second pulse waveform in the second unit waveform is greater than that of the contraction part of the second pulse waveform in the first unit drive waveform.

A piezoelectric actuator includes a piezoelectric layer and a conductor layer that is provided directly or indirectly on the piezoelectric layer. In plan view, the conductor layer includes a plurality of individual electrodes that are arranged with intervals therebetween and a plurality of wiring lines that extend from the plurality of individual electrodes. Each wiring line includes a wide portion and a first narrow portion. The wide portion includes a part positioned at a center of the wiring line in a length direction. The first narrow portion is disposed between the wide portion and one of the plurality of individual electrodes to which the wiring line is connected. The first narrow portion has a width less than a width of the wide portion.

A liquid ejecting head includes a first pressure compartment extending in a first direction; a second pressure compartment extending in the first direction; a first communication passage continuous from the first pressure compartment and extending in the first direction; a second communication passage continuous to the second pressure compartment and extending in the first direction; a third communication passage continuous from the first communication passage and extending in a second direction intersecting with the first direction; a fourth communication passage continuous to the second communication passage and extending in the second direction; a fifth communication passage continuous from the third communication passage and continuous to the fourth communication passage and extending in the first direction; and a nozzle provided on the fifth communication passage.

A liquid ejecting head includes wiring members including a first-wiring member having a first-output terminal portion extending in a first-direction and a first-input terminal portion extending in the first-direction, and a second-wiring member having a second-output terminal portion extending in the first-direction and a second-input terminal portion extending in the first-direction; and a first-wiring substrate coupled to the first and second input terminal portions, in which a center of the first-output terminal portion is located in the first-direction with respect to a center of the second-output terminal portion in plan view, a center of the first-input terminal portion is disposed in a second-direction opposite to the first-direction with respect to the center of the first-output terminal portion in the plan view, and a center of the second-input terminal portion is disposed in the first-direction with respect to the center of the second-output terminal portion in the plan view.