Abstract: A liquid ejecting head, a liquid ejecting apparatus, a liquid ejecting head cleaning method, and a liquid ejecting head manufacturing method, in which the liquid ejecting head includes a nozzle that ejects a liquid, a liquid supply path that supplies the liquid to the nozzle, a filter that filters the liquid flowing in the liquid supply path, and a liquid discharge path open in the liquid supply path between the filter and the nozzle. The liquid discharge path includes an on-off valve that opens and closes the opening. The on-off valve permits passage of the liquid from a liquid supply path side to a liquid discharge path side while blocking passage of the liquid from the liquid discharge path side to the liquid supply path side.

Abstract: There is provided a liquid ejecting unit that ejects liquid from a plurality of nozzles, in which the planar shape of the ejecting face on which the nozzles are formed is a shape in which a first portion that passes through the center line parallel to the long side of the rectangle of the minimum area including the ejecting face and a second portion that does not pass through the center line are arranged in the direction of the long side.

Abstract: A liquid ejecting head unit includes an ejecting surface in which nozzles for ejecting a liquid are formed, and a first and a second circuit substrates for ejecting the liquid from the nozzles, in which a planar shape of the ejecting surface includes a first, a second and a third portions. A center line parallel to a long side of a rectangle of a minimum area surrounding the ejecting surface passes the first portion but not the second and third portions. The second and third portions are arranged adjacently to the first portion interposed therebetween. The first circuit substrate is positioned in the first and second portions. The second circuit substrate is positioned in at least one of the first and third portions.

Abstract: A liquid ejecting head includes a pressure generating unit in order to eject liquid from a nozzle that is provided on a nozzle surface, a case in order to accommodate the pressure generating unit, and a guide portion that is provided on a side surface of the case, in which in a case of being viewed from a first direction orthogonal to the nozzle surface, the guide portion has projecting portions facing one end side in a second direction along the nozzle surface, and recessed portions facing the other end side in the second direction.

Abstract: A liquid ejecting head unit includes an ejecting surface in which nozzles for ejecting a liquid are formed, and a first and a second circuit substrates for ejecting the liquid from the nozzles, in which a planar shape of the ejecting surface includes a first, a second and a third portions. A center line parallel to a long side of a rectangle of a minimum area surrounding the ejecting surface passes the first portion but not the second and third portions. The second and third portions are arranged adjacently to the first portion interposed therebetween. The first circuit substrate is positioned in the first and second portions. The second circuit substrate is positioned in at least one of the first and third portions.

Abstract: A liquid discharging head includes an external cover portion which is connected to a liquid discharging apparatus and which discharges a liquid from a nozzle, in which the external cover portion includes a first gas hole for communicating a first gas flow path which is provided inside the external cover portion with an atmosphere, a second gas hole for carrying a gas between a second gas flow path which is provided inside the external cover portion and the liquid discharging apparatus, and a first liquid hole for carrying the liquid between a liquid flow path which is provided inside the external cover portion and the liquid discharging apparatus, and in which the first gas hole and the second gas hole are disposed separately in the external cover portion.

Abstract: A liquid ejecting head includes a pair of connectors that can be connected to each other, a flexible circuit on which one of the connectors is mounted, a circuit board on which another one of the connectors is mounted, a driver element that generates a driving force for ejecting liquid from a nozzle in response to an electric signal that is supplied from the flexible circuit to the circuit board via the pair of connectors, and a locking mechanism that locks connection between the connector of the circuit board and the connector of the flexible circuit.

Abstract: A liquid discharging head includes an external cover portion which is connected to a liquid discharging apparatus and which discharges a liquid from a nozzle, in which the external cover portion includes a first gas hole for communicating a first gas flow path which is provided inside the external cover portion with an atmosphere, a second gas hole for carrying a gas between a second gas flow path which is provided inside the external cover portion and the liquid discharging apparatus, and a first liquid hole for carrying the liquid between a liquid flow path which is provided inside the external cover portion and the liquid discharging apparatus, and in which the first gas hole and the second gas hole are disposed separately in the external cover portion.

Abstract: A liquid ejecting apparatus includes a liquid ejecting unit that ejects a liquid supplied to an internal flow path; a pump that feeds the liquid to the liquid ejecting unit; a discharge route that communicates with the internal flow path; and a closing valve disposed in the discharge route. The closing valve has an object that is biased to close the discharge route, and the object open the discharge route, due to an external force, during feeding of the liquid by the pump.

Abstract: A liquid ejecting apparatus includes a flow channel through which liquid is supplied to a liquid ejecting head, a gas permeable film that constitutes a wall surface of the flow channel, an air chamber that is separated from the flow channel through intermediation of the gas permeable film, and a pressure regulating section for changing an air pressure inside the air chamber with respect to a reference pressure. The gas permeable film is configured to change a volume of the flow channel through a change in the air pressure inside the air chamber with the pressure regulating section, and allow permeation of an air bubble when the pressure regulating section decreases the air pressure inside the air chamber.

Abstract: A liquid ejecting head includes a pressure generating unit in order to eject liquid from a nozzle that is provided on a nozzle surface, a case in order to accommodate the pressure generating unit, and a guide portion that is provided on a side surface of the case, in which in a case of being viewed from a first direction orthogonal to the nozzle surface, the guide portion has projecting portions facing one end side in a second direction along the nozzle surface, and recessed portions facing the other end side in the second direction.

Abstract: A liquid ejecting head includes a pair of connectors that can be connected to each other, a flexible circuit on which one of the connectors is mounted, a circuit board on which another one of the connectors is mounted, a driver element that generates a driving force for ejecting liquid from a nozzle in response to an electric signal that is supplied from the flexible circuit to the circuit board via the pair of connectors, and a locking mechanism that locks connection between the connector of the circuit board and the connector of the flexible circuit.

Abstract: A wall-shaped enclosure that forms a space which can accommodate a head chip is formed in a projecting manner at a lower end of a lower case member. Since a cylindrical thick part is formed at the lower end of the lower case member, the lower case member is unlikely to be bent, particularly around the wall-shaped enclosure and a part where the wall-shaped enclosure is disposed. The head chip that is disposed in the space of the lower case member which is unlikely to be bent is unlikely to be subjected to an external force, and the cover member absorbs torsion generated between the head chip and the lower case member so that the head chip is even more unlikely to be subjected to the external force.

Abstract: A liquid ejecting head unit includes a first flow path member with a first flow path and a second flow path member with a second flow path which is stacked on the first flow path member. A seal member connects the first and second flow paths and has a first seal part and a second seal part. The first flow path member applies a force to the first seal part in a stacking direction of the first and second flow path members. The second flow path member applies a force to the second seal part in a direction from the center of the second flow path to the outside and normal to the stacking direction. A retaining part controls expansion of the seal member in the normal direction with a control part. A drive element ejects liquid supplied through the first and the second flow paths through nozzles.

Abstract: A liquid ejecting head unit includes: a fixing plate provided with a plurality of openings; a plurality of heads, each of which is provided for each of the openings; and a channel holder that is provided with a plurality of channels and that accommodates the plurality of heads in cooperation with the fixing plate. Each of heads has a nozzle plate provided with a nozzle row having a plurality of nozzles. The head is fixed to a first surface of the fixing plate. An ejection surface is defined by a second surface of the fixing plate and the nozzle plate. The fixing plate has a plurality of sets, each of which has the plurality of openings. Only a part of the openings constituting each of the sets are disposed to be overlapped in a second direction, and the openings are disposed not to be overlapped in a first direction.

Abstract: A liquid ejecting head unit includes an ejecting surface in which nozzles for ejecting a liquid are formed, and a first and a second circuit substrates for ejecting the liquid from the nozzles, in which a planar shape of the ejecting surface includes a first, a second and a third portions. A center line parallel to a long side of a rectangle of a minimum area surrounding the ejecting surface passes the first portion but not the second and third portions. The second and third portions are arranged adjacently to the first portion interposed therebetween. The first circuit substrate is positioned in the first and second portions. The second circuit substrate is positioned in at least one of the first and third portions.

Abstract: There is provided a liquid ejecting unit that ejects liquid from a plurality of nozzles, in which the planar shape of the ejecting face on which the nozzles are formed is a shape in which a first portion that passes through the center line parallel to the long side of the rectangle of the minimum area including the ejecting face and a second portion that does not pass through the center line are arranged in the direction of the long side.

Abstract: A liquid ejecting apparatus includes a liquid ejecting unit that ejects a liquid supplied to an internal flow path; a pump that feeds the liquid to the liquid ejecting unit; a discharge route that communicates with the internal flow path; and a closing valve disposed in the discharge route. The closing valve has an object that is biased to close the discharge route, and the object open the discharge route, due to an external force, during feeding of the liquid by the pump.

Abstract: A liquid ejecting apparatus includes a flow channel through which liquid is supplied to a liquid ejecting head, a gas permeable film that constitutes a wall surface of the flow channel, an air chamber that is separated from the flow channel through intermediation of the gas permeable film, and a pressure regulating section for changing an air pressure inside the air chamber with respect to a reference pressure. The gas permeable film is configured to change a volume of the flow channel through a change in the air pressure inside the air chamber with the pressure regulating section, and allow permeation of an air bubble when the pressure regulating section decreases the air pressure inside the air chamber.

Abstract: A liquid ejecting apparatus includes a plurality of head units, in each of which a plurality of recording heads are disposed so as to be aligned in a main scanning direction in a holding member as a frame body, and a plurality of nozzle openings for discharging ink being disposed in a sub scanning direction in each recording head. The head units are aligned such that center lines thereof in the main scanning direction differ from each other in the main scanning direction. M (M is a natural number) liquid ejecting heads are attachable to each holding member in the main scanning direction. N (M>N (N is a natural number)) liquid ejecting heads, which discharge liquid, among the M liquid ejecting heads are arranged so as to be close to a center side of an entire width of the head units in the main scanning direction.