A first supporting member includes a first engaging portion and a second engaging portion that respectively engage with a first engaged portion and a second engaged portion that are provided in a second supporting member. The first engaging portion and the second engaging portion are configured to apply force in directions opposite to the directions in which the first engaged portion and the second engaged portion move when an opening opens.

A liquid discharge head includes a nozzle to discharge a liquid, a pressure generation chamber facing the nozzle, a common liquid chamber to supply the liquid to the pressure generation chamber, a fluid restrictor communicating with the pressure generation chamber, and a guide channel communicating with the fluid restrictor and the common liquid chamber. The guide channel includes a first adjacent portion communicating with the fluid restrictor. The pressure generation chamber has a first resonance period, and the guide channel has a second resonance period different from the first resonance period.

A liquid discharge head includes a flow passage forming member, an element substrate including a liquid discharge element and a surface on which a conductive member made from a metallic material is disposed, and an intermediate layer made from a resin material and configured to join the flow passage forming member and the surface of the element substrate to each other. The intermediate layer is disposed in a state, separated from the conductive member, where the conductive member is exposed from the intermediate layer. The conductive member is covered with the flow passage forming member.

A liquid ejection device includes: an ejecting unit configured to eject a liquid from a nozzle in a first direction; and a light source unit configured to emit light in a first optical path and a second optical path which are arranged such that the first optical path and the second optical path intersect on an extension line in the first direction from the nozzle. With the liquid ejection device having such a configuration, it becomes easy to eject the liquid at a position having a preferable interval with respect to an object.

A liquid discharge head includes a channel member and a recording element substrate. The channel member includes a discharge port configured to discharge liquid and at least one channel configured to supply the liquid to the discharge port. The recording element substrate includes a supply path and an energy generating element. The supply path connects to the at least one channel with a connection and is configured to supply the liquid to the at least one channel. The energy generating element is configured to discharge the liquid from the discharge port. The channel member further includes, at positions of the channel member facing the connection, a plurality of spaces, the spaces being formed by covering part of recesses of the channel member with a covering portion, the spaces each including an opening communicating with the at least one channel.

A member transfer method includes sticking a member supported at a support to an object, thinning the support after the sticking of the member to the object, and removing the support from the member after the thinning of the support.

A liquid discharge apparatus includes a recording head configured to discharge a liquid to form a pattern on a recording medium and a reading device configured to read the pattern. The apparatus further includes circuitry configured to form at least two first markers while moving the recording head relative to the recording medium in a head movement direction; form a second marker at one of positions of the at least two first markers, to form a pattern including a reference marker formed with one of the at least two first markers and a measurement marker in which the second marker is overlaid on another of the at least two first markers; and measure a distance between the reference marker and the measurement marker in the head movement direction based on information obtained by the reading device.

A liquid ejection device includes: an ejecting unit configured to eject a liquid from a nozzle in a first direction; and a light source unit configured to emit light in a first optical path and a second optical path which are arranged such that the first optical path and the second optical path intersect on an extension line in the first direction from the nozzle. With the liquid ejection device having such a configuration, it becomes easy to eject the liquid at a position having a preferable interval with respect to an object.

An actuator device includes: an actuator including a first element contact; and a wire member including (a) a first contact connected to the first element contact and (b) a first wire configured to conduct with the first contact. A first wide portion is formed at a distal end portion of the first wire at an edge portion of the wire member. The first wide portion is disposed beyond the first element contact in a wire direction of the first wire. The first contact is disposed at a basal end portion of the first wire. The basal end portion is located further from the edge portion of the wire member than the first wide portion. The first contact is connected to the first element contact.

A liquid discharge head includes a flow passage forming member, an element substrate including a liquid discharge element and a surface on which a conductive member made from a metallic material is disposed, and an intermediate layer made from a resin material and configured to join the flow passage forming member and the surface of the element substrate to each other. The intermediate layer is disposed in a state, separated from the conductive member, where the conductive member is exposed from the intermediate layer. The conductive member is covered with the flow passage forming member.