Abstract: A drive controller includes circuitry. The circuitry generates multiple types of drive pulses to be applied to a driver of a liquid discharge head including a valve to open and close a discharge port, and applies the multiple types of drive pulses to the driver to cause the driver to move the valve to open and close the discharge port. Each of the multiple types of drive pulses causes the valve to move away from the discharge port at a valve-opening speed to open the discharge port, keep opening the discharge port for an open time, and move toward the discharge port at a valve-closing speed to close the discharge port. Further, the circuitry generates the multiple types of drive pulses, the open time and the valve-closing speed of which are different, and changes the valve-closing speed according to the open time.

Abstract: A liquid discharge head includes a liquid port, a frame including a liquid channel in which a liquid supplied from the liquid port flows, and an intermediate member between the liquid port and the frame. The liquid port includes a first connection portion connectable to the frame, the frame includes a second connection portion connectable to the first connection portion of the liquid port, and the intermediate member includes a third connection portion connectable to the second connection portion of the frame and a fourth connection portion connectable to the first connection portion of the liquid port.

Abstract: A liquid discharge head includes a head body configured to discharge a liquid, a head cover on the head body, a head cover covering at least a part of the head body, the head cover disposed outside the head body; a liquid supply port on an upper surface of the head cover, the liquid supply port configured to supply the liquid to the head body, an electrical connection on a side surface of the head cover. The head cover includes a protruding part protruding from the upper surface of the head cover, the protruding part is on a side end of the upper surface of the head cover adjacent to the side surface of the head cover on which the electrical connection is disposed, and the protruding part is higher than another part of the upper surface of the head cover with respect to a lower end surface of the head body.

Abstract: A head module includes: a plurality of heads, a base on which the plurality of heads is arrayed in a head array direction, a plurality of individual heatsinks respectively attached to the plurality of heads, and a common heatsink standing on the base, the common heatsink including a connector thermally connected to each of the plurality of individual heatsinks. The connector of the common heatsink is along the head array direction and is adjacent to each of the plurality of individual heatsinks in a direction perpendicular to the head array direction.

Abstract: A liquid discharge head includes a head body configured to discharge a liquid, a head cover on the head body, a head cover covering at least a part of the head body, the head cover disposed outside the head body; a liquid supply port on an upper surface of the head cover, the liquid supply port configured to supply the liquid to the head body, an electrical connection on a side surface of the head cover. The head cover includes a protruding part protruding from the upper surface of the head cover, the protruding part is on a side end of the upper surface of the head cover adjacent to the side surface of the head cover on which the electrical connection is disposed, and the protruding part is higher than another part of the upper surface of the head cover with respect to a lower end surface of the head body.

Abstract: A liquid discharge head includes a liquid port, a frame including a liquid channel in which a liquid supplied from the liquid port flows, and an intermediate member between the liquid port and the frame. The liquid port includes a first connection portion connectable to the frame, the frame includes a second connection portion connectable to the first connection portion of the liquid port, and the intermediate member includes a third connection portion connectable to the second connection portion of the frame and a fourth connection portion connectable to the first connection portion of the liquid port.

Abstract: A bonding structure includes a first part including a first bonding surface and a second part including a second bonding surface to be bonded to the first bonding surface of the first part with a first adhesive and a second adhesive different from the first adhesive. At least one of the first bonding surface and the second bonding surface includes a first region on which the first adhesive is applied, a second region on which the second adhesive is applied, and a third region disposed between the first region and the second region, the third region having a water repellency higher than a water repellency of each of the first region and the second region.

Abstract: A head module includes: a plurality of heads, a base on which the plurality of heads is arrayed in a head array direction, a plurality of individual heatsinks respectively attached to the plurality of heads, and a common heatsink standing on the base, the common heatsink including a connector thermally connected to each of the plurality of individual heatsinks. The connector of the common heatsink is along the head array direction and is adjacent to each of the plurality of individual heatsinks in a direction perpendicular to the head array direction.

Abstract: A head module includes a base including a plurality of openings, and a plurality of heads inserted into the plurality of openings, respectively, to be mounted on the base. The plurality of heads includes a nozzle plate including a nozzle, an individual channel member disposed on the nozzle plate and including an individual chamber communicating with the nozzle, and a frame fixed to the individual channel member. Coefficients of linear expansion of the nozzle plate and the individual channel member are substantially identical to a coefficient of linear expansion of the base, and one of the nozzle plate and the individual channel member is bonded to the base.

Abstract: A bonding structure includes a first part including a first bonding surface and a second part including a second bonding surface to be bonded to the first bonding surface of the first part with a first adhesive and a second adhesive different from the first adhesive. At least one of the first bonding surface and the second bonding surface includes a first region on which the first adhesive is applied, a second region on which the second adhesive is applied, and a third region disposed between the first region and the second region, the third region having a water repellency higher than a water repellency of each of the first region and the second region.

Abstract: A head module includes a base including a plurality of openings, and a plurality of heads inserted into the plurality of openings, respectively, to be mounted on the base. The plurality of heads includes a nozzle plate including a nozzle, an individual channel member disposed on the nozzle plate and including an individual chamber communicating with the nozzle, and a frame fixed to the individual channel member. Coefficients of linear expansion of the nozzle plate and the individual channel member are substantially identical to a coefficient of linear expansion of the base, and one of the nozzle plate and the individual channel member is bonded to the base.

Abstract: A liquid droplet ejection head includes plural nozzles; plural individual liquid chambers; a common liquid chamber supplying liquid to the plural individual liquid chambers; a filter sheet member including plural pores formed therein to filter the liquid; and a frame body including an opening part and being in connection with the filter sheet member with adhesive. Further, a size of a region where the plural pores are formed is greater than the opening part of the frame body; an adhesive accumulation area is formed on an inner peripheral end of the opening part; and a size of the adhesive accumulation area in a protruding direction of the adhesive is greater than a size of an area between adjacent pores in the filter sheet member.

Abstract: A liquid discharge head includes a pressure generation part generating pressure to discharge a liquid droplet; and a flexible wiring member connected with the pressure generation part. The flexible wiring member includes a first flexible cable and a second flexible cable which are joined. One end part of the first flexible cable is connected with the pressure generation part, and the other end part of the first flexible cable is joined with one end part of the second flexible cable. The second flexible cable is folded to have a plane part perpendicular to a joint area between the first flexible cable and the second flexible cable and extending in a direction away from the first flexible cable, and the plane part is deformed in response to force applied from a part on which the other end part of the second flexible cable is mounted.

Abstract: Disclosed is a liquid ejecting head, including two nozzle sequences, each nozzle sequence including nozzles for ejecting a liquid drop, separate liquid chambers communicating with the nozzles, and two common liquid chambers for supplying a liquid to the separate liquid chambers and correspond to the two nozzle sequences, each common liquid chamber including a supply port for supplying a liquid thereto, an aperture, a cross-section thereof in a second direction orthogonal to a first direction of arrangement of the plural nozzles decreasing toward an end portion thereof in the first direction, wherein the supply port and aperture of one of the two common liquid chambers are provided at one end portion and the other end portion in the first direction, respectively, and the supply port and aperture of another one are provided at the other end portion and the one end portion in the first direction, respectively.

Abstract: A liquid discharge head includes a pressure generation part generating pressure to discharge a liquid droplet; and a flexible wiring member connected with the pressure generation part. The flexible wiring member includes a first flexible cable and a second flexible cable which are joined. One end part of the first flexible cable is connected with the pressure generation part, and the other end part of the first flexible cable is joined with one end part of the second flexible cable. The second flexible cable is folded to have a plane part perpendicular to a joint area between the first flexible cable and the second flexible cable and extending in a direction away from the first flexible cable, and the plane part is deformed in response to force applied from a part on which the other end part of the second flexible cable is mounted.

Abstract: Disclosed is a liquid ejecting head, including two nozzle sequences, each nozzle sequence including nozzles for ejecting a liquid drop, separate liquid chambers communicating with the nozzles, and two common liquid chambers for supplying a liquid to the separate liquid chambers and correspond to the two nozzle sequences, each common liquid chamber including a supply port for supplying a liquid thereto, an aperture, a cross-section thereof in a second direction orthogonal to a first direction of arrangement of the plural nozzles decreasing toward an end portion thereof in the first direction, wherein the supply port and aperture of one of the two common liquid chambers are provided at one end portion and the other end portion in the first direction, respectively, and the supply port and aperture of another one are provided at the other end portion and the one end portion in the first direction, respectively.

Abstract: A liquid droplet ejection head includes plural nozzles; plural individual liquid chambers; a common liquid chamber supplying liquid to the plural individual liquid chambers; a filter sheet member including plural pores formed therein to filter the liquid; and a frame body including an opening part and being in connection with the filter sheet member with adhesive. Further, a size of a region where the plural pores are formed is greater than the opening part of the frame body; an adhesive accumulation area is formed on an inner peripheral end of the opening part; and a size of the adhesive accumulation area in a protruding direction of the adhesive is greater than a size of an area between adjacent pores in the filter sheet member.