Abstract: A liquid discharge head includes multiple nozzles arrayed in two-dimensional matrix, the multiple nozzles configured to discharge a liquid, multiple pressure chambers respectively communicating with the multiple nozzles, multiple common-supply branch channels, each communicating with the multiple pressure chambers, multiple common-collection branch channels, each communicating with the multiple pressure chambers, the multiple common-collection branch channels respectively communicating with the multiple common-supply branch channels through the multiple pressure chambers, a common-supply main channel communicating with each of the multiple common-supply branch channels, a common-collection main channel communicating with each of the multiple common-collection branch channels, and two or more bypass channels communicating with the multiple common-supply branch channels and the multiple common-collection branch channels.

Abstract: A liquid discharge head includes a plurality of nozzle arrays arranged in a first direction. The plurality of nozzle arrays each includes nozzles from which a liquid is discharged, the nozzles arranged in a second direction intersecting the first direction, and one of two nozzle arrays of the plurality of nozzle arrays adjacent to each other in the first direction include at least two nozzles arranged at different nozzle intervals from corresponding nozzles of another of the two nozzle arrays in the first direction.

Abstract: A liquid discharge head includes a plurality of nozzles arrayed in a two-dimensional matrix, the plurality of nozzles configured to discharge a liquid, a plurality of pressure chambers respectively communicating with the plurality of nozzles, a plurality of common-supply branch channels communicating with two or more of the plurality of pressure chambers, a plurality of common-collection branch channels communicating with two or more of the plurality of pressure chambers, a common-supply main channel communicating with the plurality of common-supply branch channels, a common-collection main channel communicating with the plurality of common-collection branch channels, and a bypass channel configured to connect one of the plurality of common-supply branch channels and one of the plurality of common-supply branch channels. The plurality of common-supply branch channels and the plurality of common-supply branch channels are alternately arrayed in an array direction.

Abstract: A liquid discharge head includes multiple nozzles arrayed in two-dimensional matrix, the multiple nozzles configured to discharge a liquid, multiple pressure chambers respectively communicating with the multiple nozzles, multiple common-supply branch channels, each communicating with the multiple pressure chambers, multiple common-collection branch channels, each communicating with the multiple pressure chambers, the multiple common-collection branch channels respectively communicating with the multiple common-supply branch channels through the multiple pressure chambers, a common-supply main channel communicating with each of the multiple common-supply branch channels, a common-collection main channel communicating with each of the multiple common-collection branch channels, and two or more bypass channels communicating with the multiple common-supply branch channels and the multiple common-collection branch channels.

Abstract: A head array includes heads arranged in a longitudinal direction at different positions shifted in a direction orthogonal to the longitudinal direction. Each head includes: pressure chambers communicating with nozzles; common supply channel tributaries communicating with the chambers; a common supply channel mainstream communicating with the common supply channel tributaries; common collection channel tributaries communicating with the chambers; a common collection channel mainstream communicating with the common collection channel tributaries; a supply port at one end of the common supply channel mainstream; and a collection port at one end of the common collection channel mainstream. The supply and collection ports are on a same side of each head in the longitudinal direction. A direction of flow of the liquid in each common supply channel tributary is opposite between the heads. A direction of flow of the liquid in each common collection channel tributary is opposite between the heads.

Abstract: A liquid discharge head includes a plurality of nozzles arrayed in a two-dimensional matrix, the plurality of nozzles configured to discharge a liquid, a plurality of pressure chambers respectively communicating with the plurality of nozzles, a plurality of common-supply branch channels communicating with two or more of the plurality of pressure chambers, a plurality of common-collection branch channels communicating with two or more of the plurality of pressure chambers, a common-supply main channel communicating with the plurality of common-supply branch channels, a common-collection main channel communicating with the plurality of common-collection branch channels, and a bypass channel configured to connect one of the plurality of common-supply branch channels and one of the plurality of common-supply branch channels. The plurality of common-supply branch channels and the plurality of common-supply branch channels are alternately arrayed in an array direction.

Abstract: A liquid discharge head includes a plurality of pressure chambers, a plurality of individual supply channels, a plurality of common supply channel branches, a common supply channel mainstream, a plurality of individual collection channels, a plurality of common collection channel branches, a common collection channel mainstream, a supply-side filter, and a bypass channel. The common supply channel mainstream is communicated with the common supply channel branches. The common collection channel mainstream is communicated with the common collection channel branches. The supply-side filter is in the common supply channel mainstream. The bypass channel bypasses the supply-side filter and communicates the common supply channel mainstream with the common collection channel mainstream. The bypass channel is connected to the common supply channel mainstream at a downstream of the supply-side filter in a direction of flow of the liquid along a longitudinal direction of the common supply channel mainstream.

Abstract: A head array includes heads arranged in a longitudinal direction at different positions shifted in a direction orthogonal to the longitudinal direction. Each head includes: pressure chambers communicating with nozzles; common supply channel tributaries communicating with the chambers; a common supply channel mainstream communicating with the common supply channel tributaries; common collection channel tributaries communicating with the chambers; a common collection channel mainstream communicating with the common collection channel tributaries; a supply port at one end of the common supply channel mainstream; and a collection port at one end of the common collection channel mainstream. The supply and collection ports are on a same side of each head in the longitudinal direction. A direction of flow of the liquid in each common supply channel tributary is opposite between the heads. A direction of flow of the liquid in each common collection channel tributary is opposite between the heads.

Abstract: A liquid discharge head includes a plurality of pressure chambers, a plurality of individual supply channels, a plurality of common supply channel branches, a common supply channel mainstream, a plurality of individual collection channels, a plurality of common collection channel branches, a common collection channel mainstream, a supply-side filter, and a bypass channel. The common supply channel mainstream is communicated with the common supply channel branches. The common collection channel mainstream is communicated with the common collection channel branches. The supply-side filter is in the common supply channel mainstream. The bypass channel bypasses the supply-side filter and communicates the common supply channel mainstream with the common collection channel mainstream. The bypass channel is connected to the common supply channel mainstream at a downstream of the supply-side filter in a direction of flow of the liquid along a longitudinal direction of the common supply channel mainstream.

Abstract: A liquid discharge head includes a plurality of nozzle arrays arranged in a first direction. The plurality of nozzle arrays each includes nozzles from which a liquid is discharged, the nozzles arranged in a second direction intersecting the first direction, and one of two nozzle arrays of the plurality of nozzle arrays adjacent to each other in the first direction include at least two nozzles arranged at different nozzle intervals from corresponding nozzles of another of the two nozzle arrays in the first direction.

Abstract: An applying liquid is applied to a first electrode by ejecting from a nozzle the applying liquid including a raw material for forming an elecromechanical transducer film, and a film of the applying liquid applied onto the first electrode is dried. The dried film is thermally decomposed and crystallized. At this time, a voltage is applied to an accompanying droplet collecting electrode for collecting a small accompanying droplet accompanying a chief droplet. The accompanying droplet is electrostatically attracted and collected by the accompanying droplet collecting electrode before reaching the first electrode. At this time, the voltage is applied to the accompanying droplet collecting electrode by the voltage applying part after a predetermined period of time has elapsed from when a droplet of the applying liquid has been ejected from the nozzle.