JP2022065505A - Liquid discharge head, discharge unit, and liquid discharging device - Google Patents

Abstract

To improve the reliability of temperature detection.SOLUTION: A liquid discharge head 100 includes: a plurality of nozzles 111; a plurality of pressure chambers 121 communicating respectively with the plurality of nozzles 111; a plurality of common supply flow path branches 152 communicating with two or more pressure chambers 121; a plurality of common recovery flow path branches 153 communicating with the two or more pressure chambers 121; a common supply flow path main stream 156 communicating with the plurality of common supply flow path branches 152; and a common sea current flow path main stream 157 communicating with the plurality of common recovery flow path branches 153. On an actuator substrate 102 including a piezoelectric element 140, temperature detecting means 200A, 200B for detecting temperature are arranged respectively at both sides in a direction along a longitudinal direction of the common supply flow path main stream 156 and the common sea current flow path main stream 157.SELECTED DRAWING: Figure 4

Description

The present invention relates to a liquid discharge head, a discharge unit, and a device for discharging liquid.

As a liquid discharge head for discharging a liquid, there is a liquid discharge head provided with a temperature detecting means.

Conventionally, a nozzle, a pressure chamber communicating with the nozzle, a piezoelectric element for applying pressure to the liquid in the pressure chamber, a manifold communicating with a plurality of pressure chambers, a supply path for supplying the liquid to a plurality of manifolds, and a plurality of manifolds. There is one provided with a connecting flow path that connects the above and distributes the liquid supplied from the supply path to a plurality of manifolds, and a temperature detector that is provided in the connecting flow path and detects the temperature of the liquid. (Patent Document 1).

Japanese Unexamined Patent Publication No. 2019-123115

However, in the case where the common flow path is composed of the main stream and the tributary stream, the flow path arrangement in the plane becomes complicated, and the temperature detector is arranged on one side in the longitudinal direction of the common flow path as in Patent Document 1. There is a problem that the error of the temperature detection result in the plane becomes large only by itself.

The present invention has been made in view of the above problems, and an object of the present invention is to improve the reliability of temperature detection.

In order to solve the above problems, the liquid discharge head according to the present invention is
Multiple nozzles that eject liquid and
A plurality of pressure chambers communicating with each of the plurality of nozzles,
Multiple common channel tributaries leading to two or more of the pressure chambers,
A common flow path main stream that communicates with the plurality of common flow path tributaries is provided.
The temperature detecting means for detecting the temperature are arranged on both sides of the common flow path along the longitudinal direction.

According to the present invention, the reliability of temperature detection can be improved.

It is an external perspective explanatory view of the liquid discharge head which concerns on 1st Embodiment of this invention as seen from the nozzle surface side. Similarly, it is an external perspective explanatory view seen from the side opposite to the nozzle surface. It is also an exploded perspective explanatory view. Similarly, it is an exploded perspective explanatory view of the flow path constituent member. FIG. 4 is an enlarged perspective explanatory view of a main part of FIG. Similarly, it is a cross-sectional perspective explanatory view of a flow path portion. Similarly, it is a schematic plan explanatory view of the actuator board. It is a schematic plan explanatory view of the actuator board in 2nd Embodiment of this invention. It is a schematic plan explanatory view of the actuator board in 3rd Embodiment of this invention. It is a schematic plan explanatory view of the actuator board in 4th Embodiment of this invention. It is a schematic plan explanatory view of the actuator board in 5th Embodiment of this invention. It is a schematic explanatory drawing of an example of the printing apparatus as the apparatus which discharges a liquid which concerns on this invention. It is a plane explanatory view of the ejection unit of the printing apparatus.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The first embodiment of the present invention will be described with reference to FIGS. 1 to 6. FIG. 1 is an explanatory view of an external perspective of the liquid discharge head according to the same embodiment as viewed from the nozzle surface side, FIG. 2 is an explanatory view of an external perspective seen from the side opposite to the nozzle surface, and FIG. 3 is an explanatory view of an exploded perspective view. 4 is an exploded perspective explanatory view of the flow path constituent member, FIG. 5 is an enlarged perspective explanatory view of a main part of FIG. 4, and FIG. 6 is a cross-sectional perspective explanatory view of the flow path portion.

The head 100 is a circulation type liquid discharge head, and is a nozzle plate 110, a flow path plate (individual flow path member) 120, a diaphragm member 130 including a piezoelectric element 140, a common flow path tributary member 150, and a damper. It includes a member 160, a common flow path mainstream member 170, a frame member 180, a wiring member (flexible wiring board) 145, and the like. A head driver (driver IC) 146 is mounted on the wiring member 145. In the present embodiment, the individual flow path member 120 and the diaphragm member 130 constitute an actuator substrate 102 in which the piezoelectric element 140 is arranged.

The nozzle plate 110 has a plurality of nozzles 111 for discharging liquid. The plurality of nozzles 111 are arranged in a two-dimensional matrix.

The individual flow path member 120 includes a plurality of pressure chambers (individual liquid chambers) 121 communicating with each of the plurality of nozzles 111, a plurality of individual supply flow paths 122 communicating with the plurality of pressure chambers 121, and a plurality of pressure chambers 121. It forms a plurality of individual collection flow paths 123 that communicate with each other.

The diaphragm member 130 forms a diaphragm 131 which is a deformable wall surface of the pressure chamber 121, and the piezoelectric element 140 is integrally provided on the diaphragm 131. Further, the diaphragm member 130 is formed with a supply side opening 132 leading to the individual supply flow path 122 and a recovery side opening 133 leading to the individual recovery flow path 123. The piezoelectric element 140 is a pressure generating means (pressure generating element) that deforms the diaphragm 131 to pressurize the liquid in the pressure chamber 121.

The common flow path tributary member 150 alternately alternates between a plurality of common supply flow path tributaries 152 leading to two or more individual supply flow paths 122 and a plurality of common recovery flow path tributaries 153 leading to two or more individual recovery flow paths 123. It is formed adjacent to each other.

The common flow path tributary member 150 has a through hole serving as a supply port 154 through the supply side opening 132 of the individual supply flow path 122 and the common supply flow path tributary 152, and a recovery side opening 133 of the individual recovery flow path 123. A through hole is formed to serve as a recovery port 155 through the flow path tributary 153.

Further, the common flow path tributary member 150 includes one or a part 156a of the common supply flow path main stream 156 leading to the plurality of common supply flow path tributaries 152, and one or a plurality of common flow path tributaries 153 leading to the plurality of common flow path tributaries 153. A part 157a of the common recovery flow path main stream 157 is formed.

The damper member 160 has a supply-side damper facing (opposing) the supply port 154 of the common supply flow path tributary 152, and a collection-side damper facing (opposing) the collection port 155 of the common recovery flow path tributary 153. ing.

Here, the common supply flow path tributary 152 and the common recovery flow path tributary 153 seal the grooves arranged alternately in the common flow path tributary member 150, which are the same members, with the damper member 160 forming a deformable wall surface. It consists of stopping.

The common flow path mainstream member 170 forms a common supply flow path main stream 156 leading to a plurality of common supply flow path tributaries 152 and a common recovery flow path main stream 157 leading to a plurality of common recovery flow path tributaries 153.

The frame member 180 is formed with a part 156b of the common supply flow path main stream 156 and a part 157b of the common recovery flow path main stream 157. A part 156b of the common supply flow path main stream 156 leads to a supply port 181 provided in the frame member 180, and a part 157b of the common recovery flow path main stream 157 leads to a recovery port 182 provided in the frame member 180.

In the head 100, the piezoelectric element 140 bends and deforms by applying a drive pulse to the piezoelectric element 140, and pressurizes the liquid in the pressure chamber 121, so that the liquid is discharged from the nozzle 111 in the form of drops.

Further, when the operation of discharging the liquid from the head 100 is not performed, or the liquid not discharged from the nozzle 111 is circulated through the circulation path to which the recovery port 182 and the supply port 181 are connected.

Next, the configuration related to temperature detection in this embodiment will be described with reference to FIG. 7. FIG. 7 is a schematic plan explanatory view of the actuator board.

In the diaphragm member 130 of the actuator substrate 102, the piezoelectric elements 140 that pressurize the pressure chamber 121 corresponding to the plurality of pressure chambers 121 are arranged.

Individual electrode wiring 147 as a drive voltage wiring for the piezoelectric element 140 and an electrode pattern 148 (148A, 148B) leading to the common electrode wiring are provided on both edge sides in a direction orthogonal to the longitudinal direction (shortward direction) of the actuator board 102. It is arranged on the actuator board 102 along the longitudinal direction.

The electrode patterns 148 (148A and 148B) are arranged outside the common supply flow path main stream 156 and the common recovery flow path main stream 157 in a plan view in the lateral direction of the actuator substrate 102. The electrode pattern 148 means an aggregate of each individual electrode wiring 147 and an extraction terminal (connecting electrode) of the common electrode wiring.

Here, the longitudinal direction of the actuator substrate 102 is the longitudinal direction of the common supply flow path main stream 156 and the common recovery flow path main stream 157.

Temperature detecting means 200 (200A, 200B) such as a thermistor are arranged at both ends in the longitudinal direction of the actuator substrate 102 on both sides in the longitudinal direction of the common flow path mainstream.

The temperature detecting means 200 is arranged at the center of the actuator substrate 102 in the lateral direction (the direction orthogonal to the longitudinal direction of the main stream of the common flow path).

The two lead-out wires 201 and 201 of the two temperature detecting means 200A and 200B are pulled out to both ends of the actuator board 102 in the lateral direction, respectively, and form a part of the electrode patterns 148A and 148B (this is referred to as "" It is drawn out to the electrode pattern 148. "). The electrode patterns 148A and 148B are connected to the wiring member 145.

The liquid discharge head 100 of the present embodiment has a common supply flow path main flow 156, a plurality of common supply flow path tributaries 152, individual pressure chambers 121, and a plurality of common recovery flow paths, as shown by arrows in FIG. The tributary flow 153 and the common recovery flow path main stream 157 are arranged in a complicated order. The in-plane means the in-plane of the nozzle plate 110, the actuator substrate 102, the common flow path tributary member 150, the common flow path mainstream member 170, and the like.

Therefore, the temperature detecting means 200 (200A, 200B) are arranged on both sides in the direction along the longitudinal direction of the common flow path main stream. In other words, between the two temperature detecting means 200A and 200B, the common flow path main flow (common supply flow path main flow 156, common recovery flow path main stream 157), common flow path tributary (common supply flow path tributary 152, common recovery flow path). A tributary 153) and a pressure chamber 121 are arranged.

As a result, the temperature can be detected more accurately in the entire flow path, and the reliability of the temperature detection is improved.

Next, the second embodiment of the present invention will be described with reference to FIG. FIG. 8 is a schematic plan explanatory view of the actuator board in the same embodiment.

In the present embodiment, the two drawer wires 201 and 201 of the temperature detecting means 200A in the first embodiment are pulled out to one electrode pattern 148A side, and the two drawer wires 201 and 201 of the temperature detecting means 200B are the other. It is pulled out to the electrode pattern 148B side.

Thereby, the same action and effect as those of the first embodiment can be obtained.

Next, the third embodiment of the present invention will be described with reference to FIG. FIG. 9 is a schematic plan explanatory view of the actuator board in the same embodiment.

In the present embodiment, one of the temperature detecting means 200A is offset to the common supply flow path main stream 156 side in the lateral direction of the actuator substrate 102, and is viewed in a plan view on the upstream side (supply port) of the common supply flow path main stream 156. It is arranged on the side of (181 side).

The other temperature detecting means 200B is offset to the common recovery flow path main stream 157 side in the lateral direction of the actuator substrate 102, and is viewed in a plan view on the downstream side (recovery port 182 side) of the common recovery flow path main stream 157. It is placed in the direction.

The two lead-out wires 201 and 201 of the temperature detecting means 200A and 200B are led out to the electrode patterns 148A and 148B on both sides, respectively.

Thereby, the same action and effect as those of the first embodiment can be obtained. Further, it is possible to detect the temperature in the vicinity of the nozzle 111 on the most upstream side and the nozzle 111 on the downstream side.

Next, a fourth embodiment of the present invention will be described with reference to FIG. FIG. 10 is a schematic plan explanatory view of the actuator board in the same embodiment.

In the present embodiment, the two drawer wires 201 and 201 of the temperature detecting means 200A in the first embodiment are pulled out to one electrode pattern 148A side, and the two drawer wires 201 and 201 of the temperature detecting means 200B are the other. It is pulled out to the electrode pattern 148B side.

Thereby, the same action and effect as those of the third embodiment can be obtained.

Next, a fifth embodiment of the present invention will be described with reference to FIG. FIG. 11 is a schematic plan explanatory view of the actuator board in the same embodiment.

The liquid discharge head 100 of the present embodiment is a non-circulating head, and does not include the common recovery channel tributary 153 and the common recovery channel main stream 157 of the first embodiment. Also in this embodiment, as shown by the arrow in FIG. 11, the order is the common supply flow path main flow 156, the plurality of common supply flow path tributaries 152, and the individual pressure chambers 121.

Temperature detecting means 200 (200A, 200B) such as a thermistor are arranged at both ends in the longitudinal direction of the actuator substrate 102 on both sides in the longitudinal direction of the common flow path mainstream.

The temperature detecting means 200 is arranged at the center of the actuator substrate 102 in the lateral direction (the direction orthogonal to the longitudinal direction of the main stream of the common flow path).

The two lead-out wires 201 and 201 of the two temperature detecting means 200A and 200B are led out to the electrode pattern 148 side.

In such a non-circulating head, it is possible to obtain the same effect as that of the first embodiment.

Next, an example of a printing device as a device for discharging a liquid according to the present invention will be described with reference to FIGS. 12 and 13. FIG. 12 is a schematic explanatory view of the printing device, and FIG. 13 is a plan view of the ejection unit of the printing device.

The printing device 1 is a device for discharging a liquid, and includes a carry-in unit 10 for carrying in the sheet material P, a pretreatment unit 20, a printing unit 30, a drying unit 40, a reversing mechanism unit 60, and an unloading unit 50. It is equipped with.

The printing apparatus 1 applies (applies) a pretreatment liquid to the sheet material P carried in (supplied) from the carry-in unit 10 as needed by the pretreatment unit 20, which is a pretreatment means, and the printing unit 30 applies the liquid. Is applied to perform the required printing, the liquid adhering to the sheet material P is dried by the drying unit 40, and then the sheet material P is discharged to the carry-out unit 50.

The carry-in unit 10 separates the carry-in tray 11 (lower carry-in tray 11A, upper carry-in tray 11B) for accommodating a plurality of sheet materials P and the sheet material P from the carry-in tray 11 and sends them out. , 12B), and the sheet material P is supplied to the pretreatment unit 20.

The pretreatment section 20 includes, for example, a coating section 21 which is a treatment liquid applying means for aggregating ink and applying a treatment liquid having an effect of preventing show-through to the printed surface of the sheet material P.

The printing unit 30 includes a drum 31 which is a supporting member (rotating member) that supports the sheet material P on the peripheral surface and rotates, and a liquid ejection unit 32 that discharges liquid toward the sheet material P supported on the drum 31. I have.

Further, the printing unit 30 receives and dries the transfer cylinder 34 that receives the sheet material P sent from the pretreatment unit 20 and passes the sheet material P to and from the drum 31, and the sheet material P conveyed by the drum 31. It is provided with a delivery drum 35 to be handed over to the unit 40.

The tip of the sheet material P transported from the pretreatment unit 20 to the printing unit 30 is gripped by a gripping means (sheet gripper) provided on the transfer cylinder 34, and is conveyed along with the rotation of the transfer cylinder 34. The sheet material P conveyed by the delivery cylinder 34 is delivered to the drum 31 at a position facing the drum 31.

A gripping means (seat gripper) is also provided on the surface of the drum 31, and the tip of the sheet material P is gripped by the gripping means (seat gripper). A plurality of suction holes are dispersedly formed on the surface of the drum 31, and a suction airflow is generated inward from the required suction holes of the drum 31 by the suction means.

The tip of the sheet material P transferred from the transfer cylinder 34 to the drum 31 is gripped by the sheet gripper, and is adsorbed and supported on the drum 31 by the suction airflow by the suction means, and is conveyed as the drum 31 rotates. Will be done.

The liquid discharge unit 32 includes a discharge unit 33 (33A to 33D) which is a liquid discharge means. For example, the discharge unit 33A is a cyan (C) liquid, the discharge unit 33B is a magenta (M) liquid, the discharge unit 33C is a yellow (Y) liquid, and the discharge unit 33D is a black (K) liquid. Discharge each. In addition, a discharge unit that discharges a special liquid such as white or gold (silver) can also be used.

As shown in FIG. 13, the discharge unit 33 is a full, in which a plurality of liquid discharge heads (heads) 100 according to the present invention in which a plurality of nozzles 111 are arranged in a two-dimensional matrix are arranged in a staggered manner on a base member 331. It is a line type head.

The discharge operation of each discharge unit 33 of the liquid discharge unit 32 is controlled by a drive signal corresponding to the print information. When the sheet material P supported on the drum 31 passes through the region facing the liquid discharge unit 32, the liquids of each color are discharged from the discharge unit 33, and an image corresponding to the print information is printed.

The sheet material P to which the liquid is applied by the liquid discharge unit 32 is passed from the drum 31 to the delivery cylinder 35, and is passed to the transfer mechanism unit 41 that transfers the sheet material P to the drying unit 40 by the transfer cylinder 35.

The drying unit 40 heats the sheet material P transported by the transport mechanism unit 41 with the heating means 42 to dry the liquid adhering to the sheet material P. As a result, the liquid content such as water in the liquid evaporates, the colorant contained in the liquid is fixed on the sheet material P, and the curl of the sheet material P is suppressed.

The reversing mechanism unit 60 is a mechanism for reversing the sheet material P by a switchback method when double-sided printing is performed on the sheet material P that has passed through the drying unit 40, and the inverted sheet material P is a double-sided transfer path. It is sent back to the upstream side of the delivery cylinder 34 through 61.

The carry-out unit 50 includes a carry-out tray 51 on which a plurality of sheet materials P are loaded. The sheet material P conveyed from the drying unit 40 via the reversing mechanism unit 60 is sequentially stacked and held on the carry-out tray 51.

In the present application, the liquid to be discharged may have a viscosity and surface tension that can be discharged from the head, and is not particularly limited, but the viscosity becomes 30 mPa · s or less at room temperature, under normal pressure, or by heating or cooling. It is preferable that it is a thing. More specifically, solvents such as water and organic solvents, colorants such as dyes and pigments, polymerizable compounds, resins, functionalizing materials such as surfactants, biocompatible materials such as DNA, amino acids and proteins, and calcium. , Solvents, suspensions, emulsions, etc. containing edible materials such as natural pigments, such as inks for inkjets, surface treatment liquids, components of electronic and light emitting elements, and formation of electronic circuit resist patterns. It can be used in applications such as liquids and material liquids for three-dimensional modeling.

Piezoelectric actuators (laminated piezoelectric elements and thin-film piezoelectric elements), thermal actuators that use electric heat conversion elements such as heat-generating resistors, and electrostatic actuators that consist of a vibrating plate and counter electrodes are used as energy sources for discharging liquid. Includes what to do.

The "liquid discharge unit" is a liquid discharge head integrated with functional parts and a mechanism, and includes a collection of parts related to liquid discharge. For example, the "liquid discharge unit" includes a head tank, a carriage, a supply mechanism, a maintenance / recovery mechanism, a main scanning movement mechanism, a liquid circulation device in which at least one of the configurations is combined with a liquid discharge head, and the like.

Here, the term "integration" means, for example, a liquid discharge head and a functional component, a mechanism in which the mechanism is fixed to each other by fastening, bonding, engagement, etc., or one in which one is movably held with respect to the other. include. Further, the liquid discharge head, the functional component, and the mechanism may be configured to be detachable from each other.

For example, as a liquid discharge unit, there is a unit in which a liquid discharge head and a head tank are integrated. In some cases, the liquid discharge head and the head tank are integrated by being connected to each other by a tube or the like. Here, a unit including a filter can be added between the head tank of these liquid discharge units and the liquid discharge head.

Further, as a liquid discharge unit, there is a unit in which a liquid discharge head and a carriage are integrated.

Further, there is a liquid discharge unit in which the liquid discharge head and the scanning movement mechanism are integrated by holding the liquid discharge head movably by a guide member constituting a part of the scanning movement mechanism. In some cases, the liquid discharge head, the carriage, and the main scanning movement mechanism are integrated.

Further, as a liquid discharge unit, there is a carriage to which a liquid discharge head is attached, in which a cap member which is a part of the maintenance / recovery mechanism is fixed, and the liquid discharge head, the carriage, and the maintenance / recovery mechanism are integrated. ..

Further, as a liquid discharge unit, there is a liquid discharge unit in which a tube is connected to a head tank or a liquid discharge head to which a flow path component is attached, and the liquid discharge head and a supply mechanism are integrated. The liquid of the liquid storage source is supplied to the liquid discharge head through this tube.

The main scanning movement mechanism shall include a single guide member. Further, the supply mechanism includes a single tube and a single loading unit.

Although the "liquid discharge unit" is described here in combination with the liquid discharge head, the "liquid discharge unit" includes the above-mentioned head module or head unit including the liquid discharge head and the functions as described above. It also includes integrated parts and mechanisms.

The "device for discharging a liquid" includes a device including a liquid discharge head, a liquid discharge unit, a head module, a head unit, and the like, and driving the liquid discharge head to discharge the liquid. The device for discharging a liquid includes not only a device capable of discharging a liquid to a device to which the liquid can adhere, but also a device for discharging the liquid into the air or into the liquid.

The "device for discharging the liquid" may include means for feeding, transporting, and discharging paper to which the liquid can adhere, as well as a pretreatment device, a posttreatment device, and the like.

For example, as a "device that ejects a liquid", an image forming device that is a device that ejects ink to form an image on paper, and a three-dimensional object (three-dimensional object) are formed in layers in order to form a three-dimensional object. There is a three-dimensional modeling device (three-dimensional modeling device) that discharges the modeling liquid into the powder layer.

Further, the "device for discharging a liquid" is not limited to a device in which a significant image such as characters and figures is visualized by the discharged liquid. For example, those that form patterns that have no meaning in themselves and those that form a three-dimensional image are also included.

The above-mentioned "thing to which a liquid can adhere" means a material to which a liquid can adhere at least temporarily, such as a material to which the liquid adheres and adheres, and a material to which the liquid adheres and permeates. Specific examples include paper, recording paper, recording paper, film, recorded media such as cloth, electronic substrates, electronic components such as piezoelectric elements, powder layers (powder layers), organ models, and media such as inspection cells. Yes, and includes everything to which the liquid adheres, unless otherwise specified.

The material of the above-mentioned "material to which a liquid can adhere" may be paper, thread, fiber, cloth, leather, metal, plastic, glass, wood, ceramics or the like as long as the liquid can adhere even temporarily.

Further, the "device for discharging the liquid" includes, but is not limited to, a device in which the liquid discharge head and the device to which the liquid can adhere move relatively. Specific examples include a serial type device that moves the liquid discharge head, a line type device that does not move the liquid discharge head, and the like.

In addition, as a "device for ejecting a liquid", a treatment liquid coating device for ejecting a treatment liquid to the paper in order to apply the treatment liquid to the surface of the paper for the purpose of modifying the surface of the paper, etc. There is an injection granulator that granulates fine particles of the raw material by injecting a composition liquid in which the raw material is dispersed in the solution through a nozzle.

In addition, in the term of this application, image formation, recording, printing, printing, printing, modeling, etc. are all synonymous.

1 Printing device (device that discharges liquid)
30 Printing unit 33 Discharge unit 100 Liquid discharge head 102 Actuator board 110 Nozzle plate 111 Nozzle 120 Individual flow path member 121 Pressure chamber 122 Individual supply flow path 123 Individual recovery flow path 130 Vibration plate member 140 Piezoelectric element 148 Electrode pattern 150 Common flow path Tributary member 152 Common supply flow path Tributary 153 Common recovery flow path Tributary 156 Common supply flow path Main flow 157 Common recovery flow path Main flow 170 Common flow path main stream member 200 Temperature detection means

Claims (7)

Multiple nozzles that eject liquid and
A plurality of pressure chambers communicating with each of the plurality of nozzles,
Multiple common channel tributaries leading to two or more of the pressure chambers,
A common flow path main stream that communicates with the plurality of common flow path tributaries is provided.
A liquid discharge head characterized in that temperature detecting means for detecting temperature are arranged on both sides in a direction along the longitudinal direction of the common flow path main stream. It has an actuator board in which a plurality of pressure generating elements for pressurizing the plurality of pressure chambers are arranged.
The longitudinal direction of the actuator board is the longitudinal direction of the common flow path mainstream.
The liquid discharge head according to claim 1, wherein the temperature detecting means is arranged at both ends in the longitudinal direction of the actuator board. The liquid discharge head according to claim 1 or 2, wherein the wiring to the temperature detecting means is drawn out to the end portion in the lateral direction of the actuator board. The liquid discharge head according to claim 3, wherein the wiring to the temperature detecting means is drawn out to both ends of the actuator board in the lateral direction. The common flow path tributary includes a common supply flow path tributary leading to the pressure chamber and a common recovery flow path tributary leading to the pressure chamber.
The common flow path main stream includes a common supply flow path main stream leading to the common supply flow path tributary and a common recovery flow path main stream leading to the common recovery tributary.
Claims 1 to 4, wherein the temperature detecting means are arranged on the upstream side of the common supply flow path main stream and on the downstream side of the common recovery flow path tributary, respectively. The liquid discharge head according to any one. A discharge unit according to any one of claims 1 to 5, wherein a plurality of liquid discharge heads are arranged. A device for discharging a liquid, which comprises at least one of the liquid discharge head according to any one of claims 1 to 5 and the discharge unit according to claim 6.

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