JP2013063555A - Liquid discharge head and image forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such a problem that a space for arranging a means for releasing heat of a head is increased.SOLUTION: A liquid discharge head includes: a piezoelectric member 12; a base member 13 in which the piezoelectric member 12 is fixed; a piezoelectric actuator 100 including an FPC 15 for transmitting a drive signal to a piezoelectric member FPC 12; and a frame member 17. The FPC 15 and the frame member 17 are connected by a film type heat conduction member 31, and the heat generated in a driver IC 16 or the heat accumulated in the base member 13 is dissipated to the frame member 17 through the FPC 15 or the film type heat conduction member 31.

Description

  The present invention relates to a liquid discharge head and an image forming apparatus.

  As an image forming apparatus such as a printer, a facsimile, a copying machine, a plotter, or a complex machine of these, for example, a liquid discharge recording type image forming using a recording head composed of a liquid discharge head (droplet discharge head) that discharges ink droplets. Devices such as ink jet recording devices are known.

  As the liquid ejection head, for example, a diaphragm member that forms part of the wall surfaces of a plurality of pressure generation chambers individually corresponding to a plurality of nozzles arranged in parallel to eject droplets is displaced by a piezoelectric element (piezoelectric member). Some use a piezoelectric actuator that changes the volume of each pressure generating chamber to eject droplets.

  In a liquid discharge head using this piezoelectric actuator, heat is generated by driving a piezoelectric member, or heat generated by a driver IC (drive element) mounted on a flexible wiring member such as an FPC for giving a drive signal to the piezoelectric member. The temperature and viscosity of the liquid in the head channel change, and the droplet ejection characteristics are affected.

  Therefore, conventionally, a driver IC having a heat sink adhered thereto (Patent Document 1), a flexible wiring member bent multiple times (Patent Document 2), and between a plurality of heating element substrates and a supporting substrate that supports them. The thing which arrange | positioned the heat pipe (patent document 3) etc. is known.

JP 2004-291542 A JP 2006-181965 A JP 2009-149057 A

  However, as described above, in a configuration in which a heat sink or a heat pipe is used or the wiring member is bent a plurality of times, restrictions on layout and space increase, and the head density and size can be reduced. There is a problem that cannot be done.

  The present invention has been made in view of the above problems, and an object of the present invention is to save space of a means for radiating heat generated by a head.

In order to solve the above-described problem, a liquid discharge head according to the present invention includes:
A piezoelectric member that generates pressure to eject droplets;
A base member on which the piezoelectric member is fixedly disposed;
A frame member forming a frame of the head;
A flexible wiring member connected to the piezoelectric member,
At least one of the flexible wiring member and the base member and the frame member are connected by a film-like heat conducting member.

  According to the liquid discharge head according to the present invention, it is possible to save the space of the means for radiating the heat generated by the head.

FIG. 3 is an external perspective view illustrating an example of a liquid discharge head according to the first embodiment of the present invention. It is sectional explanatory drawing which follows the direction (liquid chamber longitudinal direction) orthogonal to the nozzle arrangement direction of the head. It is a perspective explanatory view around the piezoelectric actuator of the head. It is sectional explanatory drawing of the actuator part. It is explanatory drawing explaining the relationship between the actuator and a frame member. FIG. 6 is a perspective explanatory view around a piezoelectric actuator in a liquid ejection head according to a second embodiment of the present invention. It is sectional explanatory drawing of the actuator part. It is explanatory drawing explaining the relationship between the actuator and a frame member. FIG. 10 is a cross-sectional explanatory view of a piezoelectric actuator portion in a liquid ejection head according to a third embodiment of the present invention. FIG. 10 is a cross-sectional explanatory view of a piezoelectric actuator portion in a liquid ejection head according to a fourth embodiment of the present invention. FIG. 10 is a perspective explanatory view around a piezoelectric actuator in a liquid ejection head according to a fifth embodiment of the present invention. It is explanatory drawing explaining the relationship between the piezoelectric actuator and a frame member. It is a side explanatory view of a mechanism portion showing an example of an image forming apparatus according to the present invention. It is principal part plane explanatory drawing of the mechanism part.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. An example of a liquid discharge head according to the present invention will be described with reference to FIGS. FIG. 1 is an external perspective view of the head, and FIG. 2 is a cross-sectional explanatory view along a direction (liquid chamber longitudinal direction) orthogonal to the nozzle arrangement direction of the head.

  The liquid discharge head includes a flow path plate (also referred to as a flow path substrate or a liquid chamber substrate) 1, a vibration plate member 2 that forms a vibration plate bonded to the lower surface of the flow path plate 1, and a flow path. And a nozzle plate 3 joined to the upper surface of the plate 1.

  Accordingly, a plurality of individual liquid chambers (pressure liquid chamber, pressure chamber, pressure chamber, flow path) as individual flow paths through which the plurality of nozzles 4 that discharge liquid droplets (liquid drops) communicate with each other through the passage 5. (Hereinafter referred to simply as “liquid chamber”) 6, fluid resistance portion 7 also serving as a supply path for supplying ink to the liquid chamber 6, and liquid communicating with the liquid chamber 6 through the fluid resistance portion 7 An introduction part 8 is formed.

  Then, the liquid is supplied from the common liquid chamber 10 formed in the frame member 17 to be described later to the liquid chamber 6 through the liquid inlet 8 and the fluid resistance portion 7 through the supply port 9 formed in the diaphragm member 2.

  The flow path plate 1 forms grooves and openings such as the liquid chamber 6 and the fluid resistance portion 7 by etching the SUS substrate using an acidic etching solution or machining such as punching (pressing). The flow path plate 1 can also be formed by etching a silicon substrate.

  The diaphragm member 2 forms wall surfaces such as the liquid chamber 6, the fluid resistance portion 7, and the liquid introduction portion 8. Piezoelectric actuator 100 including an electromechanical conversion element as pressure generating means (actuator means, driving means) for deforming vibration area 2a on the outer side of the vibration area 2a of the vibration plate member 2 (on the side opposite to the liquid chamber 6). Is arranged.

  The piezoelectric actuator 100 has one or a plurality of (here, only one) laminated piezoelectric members 12 bonded to an adhesive on a base member 13. The piezoelectric member 12 is formed by forming a required number of columnar piezoelectric members (referred to as “piezoelectric columns”) 12A (see FIG. 3 described later) in a comb-teeth shape at predetermined intervals by groove processing by half-cut dicing. is there.

  Here, the piezoelectric member 12 is formed by alternately laminating the piezoelectric layers 21 and the internal electrodes 22, and each of the internal electrodes 22 has an end surface, that is, a side surface substantially perpendicular to the diaphragm member 2 of the piezoelectric member 12 (in the laminating direction). Are alternately drawn out to the side surface) and connected to end surface electrodes (external electrodes) 23 and 24 formed on the side surface. The end face electrode 23 is an individual external electrode, the end face electrode 24 is a common external electrode, and a voltage is applied between the external electrodes 23 and 24 to cause displacement in the stacking direction.

  The piezoelectric member 12 is connected to an FPC 15 as a flexible wiring member for giving a drive signal. The FPC 15 is mounted with a driver IC (drive circuit) 16 that applies a drive waveform (drive signal) to the piezoelectric member 12. The rear end of the FPC 15 is connected to a control board (control unit) (not shown) of the apparatus main body.

  The nozzle plate 3 is formed from a nickel (Ni) metal plate, and is manufactured by an electroforming method (electroforming). In this nozzle plate 3, nozzles 4 having a diameter of 10 to 35 μm are formed corresponding to the respective liquid chambers 6 and bonded to the flow path plate 1 with an adhesive. A water repellent layer is provided on the droplet discharge side surface (surface in the discharge direction: discharge surface or surface opposite to the liquid chamber 6 side) of the nozzle plate 3.

  Further, a frame member 17 formed of a resin member such as an epoxy resin or a metal member such as SUS is joined to the outer peripheral side of the piezoelectric actuator 100 including the piezoelectric member 12, the base member 13, and the FPC 15 and the like. Yes.

  The frame member 17 is formed with the common liquid chamber 10 described above, and further, a supply port for supplying recording liquid from the outside to the common liquid chamber 10 is formed. The supply port further includes a sub tank and an ink cartridge (not shown). Connected to an ink supply source. The frame member 17 has a hole 18 in which the piezoelectric actuator 100 is disposed.

  In the liquid discharge head configured as described above, for example, the piezoelectric member 12 contracts by lowering the voltage applied to the piezoelectric member 12 from the reference potential, and the vibration region 2 a of the vibration plate member 2 is deformed to deform the liquid chamber 6. When the volume expands, the ink flows into the liquid chamber 6, and then the voltage applied to the piezoelectric member 12 is increased to extend the piezoelectric member 12 in the stacking direction, so that the vibration region 2 a of the diaphragm member 2 is moved to the nozzle 4. By deforming in the direction and shrinking the volume of the liquid chamber 6, the ink in the liquid chamber 6 is pressurized and droplets are ejected from the nozzle 4.

  Then, by returning the voltage applied to the piezoelectric member 12 to the reference potential, the vibration region 2a of the diaphragm member 2 is restored to the initial position, and the liquid chamber 6 expands to generate a negative pressure. Ink is filled into the liquid chamber 6 from the chamber 10. Therefore, after the vibration of the meniscus surface of the nozzle 4 is attenuated and stabilized, the operation proceeds to the next droplet discharge.

  In addition to the above-described pull-punch, the liquid discharge head is not limited to the pulling method (a method in which the diaphragm member is released from the pulled state and pressurized with a restoring force), and the pushing method (the diaphragm member 2 is initially set). It can be driven by a method such as a method of extruding from a position).

  Next, portions related to the heat dissipation configuration in the present embodiment will be described with reference to FIGS. 3 to 5. 3 is a perspective explanatory view around the piezoelectric actuator of the head, FIG. 4 is a cross-sectional explanatory view of the actuator portion, and FIG. 5 is an explanatory view for explaining the relationship between the actuator and the frame member. In FIG. 5, the film-like heat conductive member is shown in a transmissive state (the same applies to the following drawings similar to FIG. 5).

  The FPC 15, which is a flexible wiring member, is provided with a wiring pattern 15 A connected to each piezoelectric column 12 A of the piezoelectric member 12, and the driver IC 16 that supplies a drive signal to each piezoelectric column 12 A of the piezoelectric member 12 as described above. It is installed.

  The outer peripheral surface side (the surface opposite to the wiring pattern 15 </ b> A) of the FPC 15 and the frame member 17 are connected by a film-like heat conductive member 31 arranged so as to wrap the piezoelectric actuator 100.

  The film-like heat conducting member 31 is made of a material having high heat conduction such as copper tape. The thicker the film-like heat conducting member 31, the easier it is to conduct heat.

  The film-like heat conducting member 31 is provided with bent portions 31a at both ends in the nozzle arrangement direction, while the frame member 17 is provided with a fixing rib 17a facing the bent portion 31a of the film-like heat conducting member 31. ing. The film-like heat conducting member 31 is joined and fixed to the frame member 17 by joining the bent portion 21 a of the film-like heat conducting member 31 and the fixing rib 17 a of the frame member 17 with the heat conducting adhesive 22. Thereby, the FPC 15 and the frame member 17 are connected by the film-like heat conducting member 31.

  When the piezoelectric member 12 is driven, the piezoelectric member 12 itself and the driver IC 16 generate heat, so that the temperature rises by continuous driving of the head. Further, a part of the heat of the piezoelectric member 12 is transmitted to the ink in the flow path inside the head and is radiated from the nozzle 4.

  However, a part of the heat of the piezoelectric member 12 and the heat of the driver IC 16 are stored in the base member 13. For this reason, when the nozzle positions to be driven are biased, for example, when only half of the nozzles are driven continuously, the heat distribution differs between the left and right in the nozzle arrangement direction, and the droplet ejection characteristics differ.

  Therefore, by connecting the FPC 15 and the frame member 17 via the film-like heat conducting member 31 as in the present embodiment, the heat generated in the driver IC 16 and the heat accumulated in the base member 13 are FPC 15, film-like. It can escape to the frame member 17 through the heat conducting member 31. Here, from the viewpoint of heat dissipation, the connecting position of the film-like heat conducting member 31 to the FPC 15 is preferably a position facing the base member 13 or a mounting position of the driver IC 16.

  Further, the connection by the film-like heat conducting member 31 is not limited to the configuration through the FPC 15, and the base member 13 and the frame member 17 may be directly connected by using the film-like heat conducting member 31. Further, the connection between the FPC 15 and the frame member 17 and the connection between the base member 13 and the frame member 17 may be used together, and the film-like heat conducting member 31 is arranged in an annular shape (arrangement as shown in FIG. 7). Both the base member 13 and the frame member 17 may be joined.

  If the base member 13 and the frame member 17 are originally directly bonded to each other using a heat conductive adhesive, the thermal conductivity at the end of the base member 13 is improved. However, when the frame member 17 and the base member 13 are directly fixed with an adhesive, the base member 13 falls down or the fixed state is changed, thereby adversely affecting the discharge state. Therefore, the influence on the base member can be almost eliminated by connecting via the film-like heat conducting member 31.

  In this manner, heat generated by the piezoelectric member 12 and the driver IC 16 can be radiated using a heat radiation path other than the flow path portion of the head. At this time, by using the thin film-like heat conducting member 31, the film-like heat conducting member 31 which also serves as a heat radiating member hardly affects the head size, and space can be saved. Then, a rapid rise in the head temperature can be suppressed by heat dissipation, and the droplet ejection characteristics are stabilized.

  Next, a liquid ejection head according to a second embodiment of the present invention will be described with reference to FIGS. 6 is a perspective explanatory view around the piezoelectric actuator in the head, FIG. 7 is a cross-sectional explanatory view of the actuator portion, and FIG. 8 is an explanatory view explaining the relationship between the actuator and the frame member.

  In the present embodiment, a piezoelectric actuator 100 in which two piezoelectric members 12 and 12 are arranged on a base member 13 is used. FPCs 15 and 15 are connected to the piezoelectric members 12 and 12, and a driver IC 16 is mounted on each FPC 15.

  The FPC 15 and the frame member 17 are thermally connected by the film-like heat conductive member 31 arranged so as to wrap the entire piezoelectric actuator 100.

  Thereby, the distribution of heat generated from a plurality of piezoelectric members and driver ICs (driving elements) can be made uniform.

  Next, a liquid ejection head according to a third embodiment of the invention will be described with reference to FIG. FIG. 9 is an explanatory sectional view of a piezoelectric actuator portion in the head.

  In the present embodiment, the FPC 15 and the base member 13 are fixed with the heat conductive adhesive 33 in the second embodiment (or the first embodiment).

  By comprising in this way, the heat of the base member 13 becomes easy to be transmitted by FPC15, and the thermal radiation by the film-form heat conductive member 31 can be performed efficiently. Moreover, it can reinforce by covering the weak adhesive force of the heat conductive adhesive 33 with the film-like heat conductive member 31 so that the force in the peeling direction does not act.

  Next, a liquid discharge head according to a fourth embodiment of the invention will be described with reference to FIG. FIG. 10 is an explanatory sectional view of a piezoelectric actuator portion in the head.

  In the present embodiment, the FPC 15 and the base member 13 are connected by the film-like heat conducting member 31. The film-like heat conductive member 31 used here is a member having an adhesive layer on both surfaces, and is connected to the base member 13 and the FPC 15 by the adhesive layer (adhesive bonding).

  With this configuration, the heat of the base member 13 is easily transmitted by the film-like heat conducting member 31. In addition, since the heat of the driver IC 16 that has passed through the FPC 15 is absorbed by the film-like heat conducting member 31, the heating of the base member 13 can be suppressed, and the frame member 17 can be promptly passed through the film-like heat conducting member 31. Heat dissipation is possible.

  Next, a liquid ejection head according to a fifth embodiment of the invention will be described with reference to FIGS. FIG. 11 is a perspective explanatory view around the piezoelectric actuator in the head, and FIG. 12 is an explanatory view explaining the relationship between the actuator and the frame member. In FIG. 11, the wiring pattern is partially omitted unlike FIG.

  In the present embodiment, a plurality of bent portions 31b are also provided at portions other than both ends of the film-like heat conducting member 31 in the nozzle arrangement direction. The plurality of bent portions 31 b are fixed to the fixing ribs 17 b provided on the frame member 17 with the heat conductive adhesive 22.

  The plurality of bent portions 31b are arranged at a plurality of locations so that the heat distribution is uniform according to the length of the film-like heat conducting member 31 in the nozzle arrangement direction.

  With this configuration, the occurrence of heat distribution can be reduced even when the head is elongated. In other words, for example, when the head is lengthened, if heat is exhausted at the end in the nozzle arrangement direction, it is far from the center in the nozzle arrangement direction, and heat distribution occurs at the end side and the center side. By comprising in this way, the exhaust heat from a center part is attained, and heat distribution can be suppressed.

  Note that a head-integrated liquid cartridge (cartridge-integrated head) can be obtained by integrating the above-described liquid discharge head and a tank that supplies liquid to the liquid discharge head.

  Next, an example of the image forming apparatus according to the present invention will be described with reference to FIGS. FIG. 13 is an explanatory side view of the mechanism portion of the apparatus, and FIG.

  This image forming apparatus is a serial type image forming apparatus, and a carriage 233 is slidably held in the main scanning direction by main and slave guide rods 231 and 232 which are guide members horizontally mounted on the left and right side plates 221A and 221B. The main scanning motor that does not perform moving scanning in the direction indicated by the arrow (carriage main scanning direction) via the timing belt.

  The carriage 233 includes a plurality of recording heads 234 including the liquid ejection head according to the present invention for ejecting ink droplets of each color of yellow (Y), cyan (C), magenta (M), and black (K). Nozzle rows composed of nozzles are arranged in the sub-scanning direction orthogonal to the main scanning direction, and are mounted with the ink droplet ejection direction facing downward.

  The recording head 234 is configured by attaching liquid ejection heads 234a and 234b each having two nozzle rows to one base member, and one nozzle row of one head 234a has a black (K) droplet. The other nozzle row ejects cyan (C) droplets, the other nozzle row of the other head 234b ejects magenta (M) droplets, and the other nozzle row ejects yellow (Y) droplets. . Note that, here, a two-head configuration is used to eject four color droplets, but a liquid ejection head for each color may be provided.

  The carriage 233 is equipped with sub tanks 235a and 235b (referred to as “sub tank 235” when not distinguished) for supplying ink of each color corresponding to the nozzle rows of the recording head 234. The sub tank 235 is supplied with ink of each color from the ink cartridge 210 of each color by the supply unit 224 via the supply tube 236 of each color.

  On the other hand, as a paper feeding unit for feeding the paper 242 stacked on the paper stacking unit (pressure plate) 241 of the paper feed tray 202, a half-moon roller (feeding) that separates and feeds the paper 242 one by one from the paper stacking unit 241. A separation pad 244 made of a material having a large coefficient of friction is provided opposite to the sheet roller 243 and the sheet feeding roller 243, and the separation pad 244 is urged toward the sheet feeding roller 243 side.

  In order to feed the sheet 242 fed from the sheet feeding unit to the lower side of the recording head 234, a guide member 245 for guiding the sheet 242, a counter roller 246, a conveyance guide member 247, and a tip pressure roller. And a conveying belt 251 which is a conveying means for electrostatically attracting the fed paper 242 and conveying it at a position facing the recording head 234.

  The conveyor belt 251 is an endless belt, and is configured to wrap around the conveyor roller 252 and the tension roller 253 so as to circulate in the belt conveyance direction (sub-scanning direction). In addition, a charging roller 256 that is a charging unit for charging the surface of the transport belt 251 is provided. The charging roller 256 is disposed so as to come into contact with the surface layer of the conveyor belt 251 and to rotate following the rotation of the conveyor belt 251. The transport belt 251 rotates in the belt transport direction when the transport roller 252 is rotationally driven through timing by a sub-scanning motor (not shown).

  Further, as a paper discharge unit for discharging the paper 242 recorded by the recording head 234, a separation claw 261 for separating the paper 242 from the transport belt 251, a paper discharge roller 262, and a paper discharge roller 263 are provided. A paper discharge tray 203 is provided below the paper discharge roller 262.

  A double-sided unit 271 is detachably attached to the back surface of the apparatus main body. The duplex unit 271 takes in the paper 242 returned by the reverse rotation of the transport belt 251, reverses it, and feeds it again between the counter roller 246 and the transport belt 251. The upper surface of the duplex unit 271 is a manual feed tray 272.

  Further, a maintenance / recovery mechanism 281 for maintaining and recovering the nozzle state of the recording head 234 is disposed in a non-printing area on one side in the scanning direction of the carriage 233. The maintenance / recovery mechanism 281 includes cap members (hereinafter referred to as “caps”) 282a and 282b (hereinafter referred to as “caps 282” when not distinguished) for capping each nozzle surface of the recording head 234, and nozzle surfaces. A wiper blade 283 that is a blade member for wiping the ink, and an empty discharge receiver 284 that receives liquid droplets when performing empty discharge for discharging liquid droplets that do not contribute to recording in order to discharge thickened ink. Yes.

  In addition, in the non-printing area on the other side of the carriage 233 in the scanning direction, idle ejection that receives droplets when performing idle ejection that ejects droplets that do not contribute to recording in order to discharge ink that has been thickened during recording or the like A receiver 288 is disposed, and the idle discharge receiver 288 is provided with an opening 289 along the nozzle row direction of the recording head 234 and the like.

  In the image forming apparatus configured as described above, the sheets 242 are separated and fed one by one from the sheet feeding tray 202, and the sheet 242 fed substantially vertically upward is guided by the guide member 245, It is sandwiched between the counter roller 246 and conveyed, and further, the leading end is guided by the conveying guide 237 and pressed against the conveying belt 251 by the leading end pressure roller 249, and the conveying direction is changed by about 90 °.

  At this time, a positive output and a negative output are alternately applied to the charging roller 256, that is, an alternating voltage is applied, and a charging voltage pattern in which the conveying belt 251 alternates, that is, in the sub-scanning direction that is the circumferential direction. , Plus and minus are alternately charged in a band shape with a predetermined width. When the sheet 242 is fed onto the conveyance belt 251 charged alternately with plus and minus, the sheet 242 is attracted to the conveyance belt 251, and the sheet 242 is conveyed in the sub scanning direction by the circumferential movement of the conveyance belt 251.

  Therefore, by driving the recording head 234 according to the image signal while moving the carriage 233, ink droplets are ejected onto the stopped paper 242 to record one line, and after the paper 242 is conveyed by a predetermined amount, Record the next line. Upon receiving a recording end signal or a signal that the trailing edge of the paper 242 has reached the recording area, the recording operation is finished and the paper 242 is discharged onto the paper discharge tray 203.

  As described above, since the image forming apparatus includes the liquid discharge head according to the present invention, for example, even when the head is continuously driven, heat is exhausted from the frame member, and a change in droplet discharge characteristics is suppressed. The head heat distribution can be made uniform, the characteristic difference in the head can be suppressed, and a high-quality image can be stably formed.

  In the present application, the “paper” is not limited to paper, but includes OHP, cloth, glass, a substrate, etc., and means a material to which ink droplets or other liquids can be attached. , Recording media, recording paper, recording paper, and the like. In addition, image formation, recording, printing, printing, and printing are all synonymous.

  The “image forming apparatus” means an apparatus that forms an image by discharging liquid onto a medium such as paper, thread, fiber, fabric, leather, metal, plastic, glass, wood, ceramics, etc. “Formation” means not only giving an image having a meaning such as a character or a figure to a medium but also giving an image having no meaning such as a pattern to the medium (simply causing a droplet to land on the medium). ) Also means.

  The “ink” is not limited to an ink unless otherwise specified, but includes any liquid that can form an image, such as a recording liquid, a fixing processing liquid, or a liquid. Used generically, for example, includes DNA samples, resists, pattern materials, resins, and the like.

  In addition, the “image” is not limited to a planar image, and includes an image given to a three-dimensionally formed image and an image formed by three-dimensionally modeling a solid itself.

  Further, the image forming apparatus includes both a serial type image forming apparatus and a line type image forming apparatus, unless otherwise limited.

DESCRIPTION OF SYMBOLS 1 Flow path plate 2 Vibration plate member 3 Nozzle plate 4 Nozzle 6 Liquid chamber 10 Common liquid chamber 12 Piezoelectric member 12A Drive pillar 13 Base member 15 FPC (flexible wiring member)
16 Driver IC
17 Frame member 31 Film-like heat conducting member 233 Carriage 234a, 234b Recording head

Claims (6)

A piezoelectric member that generates pressure to eject droplets;
A base member on which the piezoelectric member is fixedly disposed;
A frame member forming a frame of the head;
A flexible wiring member connected to the piezoelectric member,
At least one of the flexible wiring member and the base member and the frame member are connected by a film-like heat conducting member. The two piezoelectric members are arranged side by side on the base member;
The flexible wiring member is connected to each of the two piezoelectric members,
The liquid ejection head according to claim 1, wherein the film-like heat conducting member is fixed so as to enclose the two flexible wiring members.   The liquid discharge head according to claim 1, wherein the base member and the flexible wiring member are bonded with a heat conductive adhesive.   4. The liquid discharge head according to claim 1, wherein the film-like heat conducting member is a tape-like member having adhesive layers on both sides.   The portion of the film-like heat conductive member to be fixed to the base is provided with a plurality of bent portions, and the bent portions are fixed to the base member with a heat conductive adhesive. The liquid discharge head according to any one of 4.   An image forming apparatus comprising the liquid discharge head according to claim 1.

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