Brother Kogyo Kabushiki-kaisha

Hikaru Nakamoto

Atsushi Ito

Shohei Koide

Manabu Hibi

Hidekazu Nogami

Hiroaki Hiraide

A liquid ejecting device, having a fluid passage structure formed with multiple nozzles arranged in a particular nozzle arrangement direction and multiple passages respectively communicating with the multiple nozzles. The fluid passage structure has a metallic nozzle plate formed with the multiple nozzles which is arranged in a nozzle arrangement direction. Further, the metallic nozzle plate has a liquid ejection surface on which multiple ejection openings respectively corresponding to the multiple nozzles being formed, multiple convex parts protruding from the liquid ejection surface, the multiple convex parts being arranged along the nozzle arrangement direction, beside the multiple ejection openings, respectively. Further, the multiple convex parts are formed by press working applied to the nozzle plate from a side opposite to the liquid ejection surface.

Liquid ejecting device and method of manufacturing liquid ejecting device

A liquid ejection head has recessed portions are formed in an ejection face, such that a distance dis between a center of an ejection opening in one recessed portion and an other-side side face of another recessed portion adjacent thereto on one side, where a distance dis between the center and a one-side face of another recessed portion adjacent to the one recessed portion on the other side, and where a distance xis between the center and a one-side side face of the one recessed portion, and a distance xis between the center and an other-side side face thereof. A central position of a bottom portion of the one recessed portion is positioned relative to the center, such that a relationship between distance dand distance dis the same as a relationship between distance xand distance x

Liquid ejection head and method of manufacturing the same

A liquid ejection head includes: a plate base material; and an actuator; wherein the plate base material has: ejection holes having recessed portions; and an ejection face having ejection openings. The recessed portions include pairs each constituted by two recessed portions located side by side and at least one of which has the ejection openings. A shortest line segment of a certain pair is equal to or shorter than that of another pair, an average value of lengths of the respective recessed portions constituting the certain pair is not larger than that of lengths of the respective recessed portions constituting another pair.

A punch for use in molding a workpiece with lubricating oil interposed between the punch and the workpiece includes a straight portion and a diameter-increasing portion. The straight portion includes an end face and a side face. The straight portion extends in an axial direction. The end surface extends in a radial direction perpendicular to the axial direction. The side surface is connected to the end surface. The diameter-increasing portion is connected to the straight portion. The diameter-increasing portion includes a width in the radial direction, which is identical to that of the straight portion, at a junction between the straight portion and the diameter-increasing portion. The width of the diameter-increasing portion in the radial direction increases with distance from the straight portion. At least one of the end surface and the side surface of the straight portion is formed with a pit.

Punch

A liquid ejection head, wherein recessed portions are formed in an ejection face such that, where, in the one direction, a distance Dis a distance between (i) a one-side portion of an opening end of one recessed portion and (ii) an other-side portion of an opening end of another recessed portion adjacent to the one recessed portion on one side thereof and where a distance Dis a distance between (i) an other-side portion of the opening end of the one recessed portion and (ii) a one-side portion of an opening end of another recessed portion adjacent to the one recessed portion on the other side thereof, a large-and-small relationship of an average value of the distances D, Dof a second recessed portion with respect to that of a first recessed portion is the same as a large-and-small relationship of a cross-sectional area of the first recessed portion with respect to that of the second recessed portion.

A nozzle plate has a nozzle hole for ejecting liquid, which penetrates in a thickness direction of the nozzle plate. An ejection face of the nozzle plate having an ejection opening of the nozzle hole is covered with a water-repellent coat having a through hole communicating with the nozzle hole. The through hole has a straight portion and a diameter expansion portion. The straight portion is contiguous to the nozzle hole and having the same diameter as the ejection opening. The diameter expansion portion is provided to interpose the straight portion with the nozzle hole and gradually expanding so that a part thereof farther from the straight portion has a larger diameter than a part thereof closer to the straight portion.

Method of manufacturing nozzle plate

A nozzle plate cutting off method for cutting off the nozzle plate from a primary processing plate including a frame body, a nozzle plate which has multiple nozzle holes for ejecting droplets and is separately arranged inside the frame body, and a connection portion arranged at a clearance between the frame body and the nozzle plate to connect the frame body to the nozzle plate. In the nozzle plate cutting off method, a punching tool is used to punch out the nozzle plate at a connection region of the connection portion with the nozzle plate, there by cutting off the nozzle plate from the primary processing plate.

Growing community of inventors

Inuyama, Japan

Hikaru Nakamoto