Abstract: A ink jet type recording head which circulates ink between a first manifold and a second manifold via a pressure generation chamber is provided, the flow path member has a first and second bypass flow paths which connect the first and second manifolds, respectively in two locations of one end side and the other end side of a nozzle row on the outside of the nozzle row on which the nozzle openings are formed, and a relationship between a flow path resistance R of the first and second bypass flow paths, and a flow path resistance r of a flow path portion including the pressure generation chamber which connects the first and second manifolds is R<r/N (wherein, N is the number of all nozzle openings).

Abstract: A liquid ejecting head includes a head body configured to eject liquid, a flow path member including a liquid flow path for supplying the liquid to the head body, and a circuit substrate held by the flow path member and including a temperature detection unit configured to detect a temperature. The flow path member includes a detection region, which has a thermal resistance lower than a thermal resistance of other regions and which is provided in a part of a partition wall that partitions the liquid flow path. The circuit substrate is fixed to the flow path member in a state in which the temperature detection unit faces the detection region.

Abstract: A liquid ejection head includes a nozzle plate on which nozzle openings for ejecting liquid are provided, a flow path formation substrate on which pressure generation chambers communicating with the nozzle openings are provided, communicating portions in which the liquid to be supplied to the pressure generation chambers is stored, and piezoelectric elements which generate pressure change in the liquid in the pressure generation chambers. In the liquid ejection head, a thermistor is arranged on a surface of the flow path formation substrate at an opposite side to the nozzle openings and one lead wiring of the thermistor is connected to wiring layers which are formed on the surface of the flow path formation substrate in a state where one side ends of the wiring layers face to the communicating portions.

Abstract: Provided is a liquid ejecting apparatus including a first temperature sensor for detecting ink temperature and a second temperature sensor for detecting ambient temperature of a liquid ejecting head, in which a controller for controlling discharge of the ink generates a driving signal including a discharge voltage which is used for, based on a temperature detected by the first temperature sensor, discharging ink droplets through nozzle openings and a fine-oscillation voltage which is used for finely oscillating meniscuses of the ink without discharging the ink droplets and corresponds to the discharge voltage. Furthermore, the controller sets a coefficient in accordance with a temperature difference between the ink temperature and the ambient temperature and controls an energy level of the fine oscillation by applying the fine-oscillation voltage, based on the coefficient.

Abstract: A liquid ejecting head includes a liquid channel having a pressure generating chamber communicated with a nozzle opening that ejects liquid, and a first liquid chamber installed at one end of the pressure generating chamber to communicate a plurality of pressure generating chambers; a pressure generating unit for changing pressure in the pressure generating chamber so that liquid is discharged from the nozzle opening; a heating unit for heating liquid in the liquid channel at an upstream of the pressure generating chamber; a second liquid chamber installed at the other end of the pressure generating chamber; and a circulating channel formed among a pressure generating chamber group having at least one pressure generating chamber to connect the first liquid chamber and the second liquid chamber.

Abstract: A liquid ejecting apparatus includes a liquid ejecting head that ejects liquid in a manifold as liquid droplets from a nozzle opening; a supply path that supplies the liquid to the manifold; a pump unit that is disposed in the supply path and pumps the liquid; and a discharge path that discharges the liquid from the manifold, wherein a flow path resistance of the discharge path from the manifold is smaller than a flow path resistance of the supply path from the pump unit to the manifold.

Abstract: A liquid ejecting head comprising, a plurality of nozzle openings, a first flow passage, a circulation flow passage, a filter chamber, and a bypass flow passage, an inner diameter of the bypass flow passage is larger than a diameter of the hole of the filter, the inner diameter of the bypass flow passage is larger than a diameter of the nozzle opening, and a flow passage resistance of the bypass flow passage is larger than a flow passage resistance of the circulation flow passage from a branch point where the bypass flow passage branches from the supply passage to a junction point where the bypass flow passage merges into the collection passage.

Abstract: A filter unit includes: a space portion, through which a liquid passes, whose outer cross-sectional shape when cut along the direction orthogonal to the axial direction is circular or polygonal; a filter provided at the surface on one end side of the space portion in the axial direction thereof; a protruding member, provided at the surface on the other end side of the space portion in the axial direction thereof, that protrudes toward a center area of the surface on the one end side of the space portion; an inflow channel that allows the liquid to flow into the space portion from a direction tangential to the side circumferential surface of the space portion; and an outflow channel that allows the liquid to pass through the filter and flow out from the space portion.

Abstract: A liquid ejecting head includes a flow path unit that has a nozzle line formed by a plurality of nozzles and includes a flow path communicating with the nozzles, a head case that forms a shared liquid flow path for supplying a liquid to the flow path of the flow path unit and is connected with the flow path unit, and a sheet-like heater that is mounted on a side surface of the head case and has a continuous heat-generatable heating element folded multiple times. A portion of the heating element located in a region close to a position opposing the shared liquid flow path is narrower than a portion of the heating element located at a position other than the region.

Abstract: A filter unit includes: a space portion, through which a liquid passes, whose outer cross-sectional shape when cut along the direction orthogonal to the axial direction is circular or polygonal; a filter provided at the surface on one end side of the space portion in the axial direction thereof; a protruding member, provided at the surface on the other end side of the space portion in the axial direction thereof, that protrudes toward a center area of the surface on the one end side of the space portion; an inflow channel that allows the liquid to flow into the space portion from a direction tangential to the side circumferential surface of the space portion; and an outflow channel that allows the liquid to pass through the filter and flow out from the space portion.

Abstract: A ink jet type recording head which circulates ink between a first manifold and a second manifold via a pressure generation chamber is provided, the flow path member has a first and second bypass flow paths which connect the first and second manifolds, respectively in two locations of one end side and the other end side of a nozzle row on the outside of the nozzle row on which the nozzle openings are formed, and a relationship between a flow path resistance R of the first and second bypass flow paths, and a flow path resistance r of a flow path portion including the pressure generation chamber which connects the first and second manifolds is R<r/N (wherein, N is the number of all nozzle openings).

Abstract: A liquid ejection head including: a flow channel unit including a nozzle plate, and a flow-channel-containing substrate (FCC), the nozzle plate and the FCC being laminated, a head case formed with a common liquid flow channel configured to supply the liquid to the reservoir and joined to the FCC on the side opposite from the nozzle plate; a heater configured to heat the nozzle plate; a head cover heated by the heater and formed with a bottom surface portion opposing the nozzle plate on the side opposite from the head case, wherein a distal end of the head cover comes into abutment with a portion between an area of the nozzle plate corresponding to the reservoir and an area formed with the nozzle row, and a void is formed between the area of the nozzle plate corresponding to the reservoir and the head cover.

Abstract: A liquid ejecting head unit includes a flow path unit including a flow path communicating with a plurality of nozzles, a head case in which a common liquid flow path for supplying liquid to the flow path of the flow path unit is formed and to which the flow path unit is bonded, a flow path member which is bonded to the head case at the side opposite to the side to which the flow path unit is bonded and includes an upstream-side flow path for supplying liquid to the common liquid flow path, a heater which is mounted on a side face of the head case and is capable of generating heat, and a metal plate a portion of which is bonded to the heater and other portions of which are opposed to a portion of the flow path member.

Abstract: A filter unit includes: a space portion, through which a liquid passes, whose outer cross-sectional shape when cut along the direction orthogonal to the axial direction is circular or polygonal; a filter provided at the surface on one end side of the space portion in the axial direction thereof; a protruding member, provided at the surface on the other end side of the space portion in the axial direction thereof, that protrudes toward a center area of the surface on the one end side of the space portion; an inflow channel that allows the liquid to flow into the space portion from a direction tangential to the side circumferential surface of the space portion; and an outflow channel that allows the liquid to pass through the filter and flow out from the space portion.

Abstract: In the heating flow path unit, the entrance-side sealing member has an inflow restriction portion which restricts flow of liquid on a portion corresponding to an individual entrance-side opening of a liquid flow path in which flow rate is relatively high among the liquid flow paths.

Abstract: A liquid ejecting head includes a liquid channel having a pressure generating chamber communicated with a nozzle opening that ejects liquid, and a first liquid chamber installed at one end of the pressure generating chamber to communicate a plurality of pressure generating chambers; a pressure generating unit for changing pressure in the pressure generating chamber so that liquid is discharged from the nozzle opening; a heating unit for heating liquid in the liquid channel at an upstream of the pressure generating chamber; a second liquid chamber installed at the other end of the pressure generating chamber; and a circulating channel formed among a pressure generating chamber group having at least one pressure generating chamber to connect the first liquid chamber and the second liquid chamber.

Abstract: A liquid ejection head includes a nozzle plate on which nozzle openings for ejecting liquid are provided, a flow path formation substrate on which pressure generation chambers communicating with the nozzle openings are provided, communicating portions in which the liquid to be supplied to the pressure generation chambers is stored, and piezoelectric elements which generate pressure change in the liquid in the pressure generation chambers. In the liquid ejection head, a thermistor is arranged on a surface of the flow path formation substrate at an opposite side to the nozzle openings and one lead wiring of the thermistor is connected to wiring layers which are formed on the surface of the flow path formation substrate in a state where one side ends of the wiring layers face to the communicating portions.

Abstract: A liquid ejecting head unit includes: a liquid ejecting head that ejects a liquid through nozzles by driving a pressure generation element to cause the pressure within a pressure chamber to fluctuate; a flow channel member in which is formed a flow channel that supplies the liquid to a head flow channel of the liquid ejecting head; a substrate, mounted to a side surface of the flow channel member, on which is mounted an electrical component for supplying power to the pressure generation element; and a temperature measurement device provided on the surface of the substrate that faces the flow channel member. Here, the flow channel member includes an opening that passes therethrough toward the flow channel; and the temperature of the liquid within the flow channel is measured by the temperature measurement device that is provided facing the opening.

Abstract: A liquid ejecting head includes a flow path unit that has a nozzle line formed by a plurality of nozzles and includes a flow path communicating with the nozzles, a head case that forms a shared liquid flow path for supplying a liquid to the flow path of the flow path unit and is connected with the flow path unit, and a sheet-like heater that is mounted on a side surface of the head case and has a continuous heat-generatable heating element folded multiple times. A portion of the heating element located in a region close to a position opposing the shared liquid flow path is narrower than a portion of the heating element located at a position other than the region.

Abstract: A liquid ejecting head unit includes a flow path unit including a flow path communicating with a plurality of nozzles, a head case in which a common liquid flow path for supplying liquid to the flow path of the flow path unit is formed and to which the flow path unit is bonded, a flow path member which is bonded to the head case at the side opposite to the side to which the flow path unit is bonded and includes an upstream-side flow path for supplying liquid to the common liquid flow path, a heater which is mounted on a side face of the head case and is capable of generating heat, and a metal plate a portion of which is bonded to the heater and other portions of which are opposed to a portion of the flow path member.