JP2012187720A - Liquid ejecting head and image forming apparatus - Google Patents

Liquid ejecting head and image forming apparatus Download PDF

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Publication number
JP2012187720A
JP2012187720A JP2011050656A JP2011050656A JP2012187720A JP 2012187720 A JP2012187720 A JP 2012187720A JP 2011050656 A JP2011050656 A JP 2011050656A JP 2011050656 A JP2011050656 A JP 2011050656A JP 2012187720 A JP2012187720 A JP 2012187720A
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Prior art keywords
piezoelectric
head
liquid
head base
electric circuit
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JP2011050656A
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Japanese (ja)
Inventor
Atsushi Yanaka
厚志 矢仲
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Ricoh Co Ltd
株式会社リコー
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Priority to JP2011050656A priority Critical patent/JP2012187720A/en
Publication of JP2012187720A publication Critical patent/JP2012187720A/en
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Abstract

When a wiring pattern or a driver IC is formed on a head base member made of a resin member, deformation due to heat generation during driving and strength during processing of a piezoelectric member cannot be obtained.
A head base member 13 includes a first member 101 made of an insulating material such as a resin material to which a piezoelectric member 12 is bonded and fixed, and a second member made of a metal material such as SUS having higher rigidity than the first member 101. The first member 101 is formed with a wiring pattern 103 as an electric circuit, and the wiring pattern 103 formed on the side surface of the first member 101 and the driving column 12A of the piezoelectric member 12 are formed. The electrodes 23 and 24 are connected by an FPC 104 which is a flexible wiring board.
[Selection] Figure 3

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. An apparatus (for example, an ink jet recording apparatus) is known. This liquid discharge recording type image forming apparatus means that ink droplets are transported from a recording head (not limited to paper, including OHP, and can be attached to ink droplets and other liquids). Yes, it is also ejected onto a recording medium or a recording medium, recording paper, recording paper, etc.) to form an image (recording, printing, printing, and printing are also used synonymously). And a serial type image forming apparatus that forms an image by ejecting liquid droplets while the recording head moves in the main scanning direction, and a line type head that forms images by ejecting liquid droplets without moving the recording head There are line type image forming apparatuses using
  In the present application, the “image forming apparatus” of the liquid discharge recording method is an apparatus that forms an image by discharging liquid onto a medium such as paper, thread, fiber, fabric, leather, metal, plastic, glass, wood, ceramics, or the like. In addition, “image 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 It also means that a droplet is landed on a medium). “Ink” is not limited to ink, but is used as a general term for all liquids capable of image formation, such as recording liquid, fixing processing liquid, and liquid. DNA samples, resists, pattern materials, resins and the like are also included. The term “paper” is not limited to paper, but includes the above-described OHP sheet, cloth, and the like, and means that ink droplets adhere to the recording medium, recording medium, recording paper, recording It is used as a general term for what includes what is called paper. 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.
  As a liquid discharge head, for example, a piezoelectric member is bonded and fixed to a base member (head base member) made of a metal member, and a plurality of piezoelectric element columns (piezoelectric columns) are formed by subjecting the piezoelectric member to groove processing such as dicing. A piezoelectric head connected with an FPC as a flexible wiring board on which a driver IC (driving circuit) that applies a driving signal to a piezoelectric column is mounted is known (Patent Document 1).
  In such a piezoelectric head, when a large number of nozzles, that is, a large number of piezoelectric elements (piezoelectric columns) are driven at the same time, vibration propagates to the head base member and the head base member resonates, and the droplet ejection characteristics vary. There is a problem that the image quality deteriorates.
  Therefore, conventionally, as a head base member for fixing a piezoelectric member (piezoelectric element), there is known one in which a plate piece is punched out and laminated and a side surface portion is joined as a welded portion (Patent Document 2). .
  In addition, a flexible wiring board such as FPC as a driving signal transmission means for driving the piezoelectric element has a problem of high cost.
  Therefore, conventionally, a driver IC itself in which a head base member is entirely formed of a resin member, a wiring pattern is mounted on the surface of the head base member, and a driving circuit for supplying a driving signal to a piezoelectric element without using an FPC is formed. What was mounted in the head base member is known (patent document 3).
JP 2008-188788 A JP 2004-106405 A JP 2009-286081 A
  However, in the head base member obtained by punching and joining a plurality of plate pieces disclosed in Patent Document 2 described above, vibration characteristics change due to variations in plate thickness and joining state of the plate pieces. Therefore, there are problems that the droplet discharge characteristics are not stable and it is difficult to stabilize the characteristics of mass production.
  Further, in the head base member made of a resin material disclosed in Patent Document 3, as described above, one or a plurality of piezoelectric members are fixed to the head base member, and a large number of piezoelectric element columns ( When the step of forming the piezoelectric pillar is employed, the fixing of the piezoelectric member during dicing becomes unstable due to insufficient rigidity, and the head base member may be deformed with time due to heat generated when the piezoelectric element is driven. There are challenges. Further, by mounting the driver IC directly in the head base member, there is a risk of deformation due to heat during mounting and deformation due to heat generation during driving.
  The present invention has been made in view of the above-mentioned problems. By maintaining the rigidity of the piezoelectric member bonding side to ensure the strength during processing of the piezoelectric member and suppressing deformation due to heat, stable droplet discharge characteristics can be obtained. It aims at reducing cost by reducing the usage-amount of a flexible wiring board.
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 head base member to which the piezoelectric member is fixed,
The head base member is
A first member made of an insulating material on which an electric circuit is formed;
A second member having higher rigidity than the first member is laminated;
The piezoelectric member is fixed to the second member,
The electric circuit formed on the first member of the head base member and the piezoelectric member are connected via a flexible wiring board.
  Here, the flexible wiring board may have a configuration in which only a driver IC that drives the piezoelectric member is mounted.
  The electric circuit may be a wiring pattern formed by a mold interconnect device (MID).
  The wiring pattern of the electric circuit may be formed on a side surface of the head base member that is perpendicular to a surface that fixes the piezoelectric member and a surface opposite to the surface that fixes the piezoelectric member.
  Further, a noise prevention component may be mounted on the electric circuit of the head base member.
  Further, both end portions of the flexible wiring board may be connected to the electric circuit and the piezoelectric member on the same side surface side of the head base member.
  The image forming apparatus according to the present invention includes the liquid ejection head according to the present invention.
  According to the liquid ejection head according to the present invention, the head base member is formed by laminating a first member made of an insulating material on which an electric circuit is formed and a second member having higher rigidity than the first member, The piezoelectric member is fixed to the second member, and the electric circuit formed on the first member of the head base member and the piezoelectric member are connected via a flexible wiring board. To ensure the strength when processing piezoelectric members and to suppress deformation caused by heat, so that stable droplet ejection characteristics can be obtained, and the cost can be reduced by reducing the amount of flexible wiring board used Can do.
  According to the image forming apparatus according to the present invention, since the liquid ejection head according to the present invention is provided, a high-quality image can be formed.
FIG. 6 is a cross-sectional explanatory diagram along a direction (liquid chamber longitudinal direction) orthogonal to the nozzle arrangement direction of the liquid discharge head to which the present invention is applied. It is sectional explanatory drawing in alignment with the nozzle arrangement direction (liquid chamber short direction) of the head. It is side surface explanatory drawing of the head base member part with which it uses for description of 1st Embodiment of this invention. It is side surface explanatory drawing of the head base part of the liquid discharge head which concerns on 2nd Embodiment of this invention. It is front explanatory drawing which shows the connection part of the 1st member and FPC of the liquid discharge head which concern on 3rd Embodiment of this invention in a permeation | transmission state. FIG. 10 is an explanatory front view of a head base portion of a liquid ejection head according to a fourth embodiment of the present invention. 1 is an explanatory side view illustrating an overall configuration of a mechanism unit 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 to which the present invention is applied will be described with reference to FIGS. 1 is a cross-sectional explanatory view along a direction (longitudinal direction of the liquid chamber) orthogonal to the nozzle arrangement direction of the head, and FIG. 2 is a cross-sectional explanatory view along the nozzle arrangement direction (liquid chamber short direction) of the head. .
  The liquid discharge head includes a flow path substrate (liquid chamber substrate) 1 formed of a SUS substrate, a vibration plate member 2 bonded to the lower surface of the flow path substrate 1, and a nozzle plate 3 bonded to the upper surface of the flow path substrate 1. And a plurality of nozzles 4 for ejecting droplets (liquid droplets) by these, respectively, as a plurality of liquid chambers (pressurized liquid chamber, pressure chamber, Also referred to as a pressure chamber, a flow path, etc.) 6, a fluid resistance portion 7 that also serves as a supply path for supplying ink to the liquid chamber 6, and a communication portion 8 that communicates with the liquid chamber 6 via the fluid resistance portion 7. Ink is supplied from a common liquid chamber 10 formed in a frame member 17 to be described later to the communication portion 8 through a supply port 9 formed in the diaphragm member 2.
  The flow path substrate 1 is configured by bonding a flow path plate 1A and a communication plate 1B. The flow path substrate 1 is formed by etching the SUS substrate using an acidic etchant or machining such as punching (pressing), so that the communication path 5, the liquid chamber 6, the fluid resistance portion 7, the communication portion 8, etc. Each opening is formed. As the flow path substrate 1, a silicon substrate or the like can be used.
  The diaphragm member 2 has each vibration region (diaphragm portion) 2a that forms a wall surface corresponding to each liquid chamber 6, and an island-shaped convex portion on the outer side of the vibration region 2a (on the side opposite to the liquid chamber 6). 2b is provided. A piezoelectric actuator 100 including an electromechanical transducer as a driving means (actuator means, pressure generating means) for deforming the vibration region 2a is disposed on the island-shaped convex portion 2b side of the diaphragm member 2.
  The piezoelectric actuator 100 has a plurality of (here, two) laminated piezoelectric members 12 bonded to each other by a glue on a head base member 13 to be described in detail, and the piezoelectric member 12 has grooves formed by half-cut dicing. A plurality of piezoelectric columns 12A and 12B are formed in a comb-like shape at a predetermined interval for one piezoelectric member 12 by processing 31. The piezoelectric columns 12A and 12B of the piezoelectric member 12 are the same, but the piezoelectric column that is driven by applying a drive waveform is the piezoelectric column 12A, and the piezoelectric column that is used as a simple column without applying the drive waveform is a non-piezoelectric column. It is distinguished as 12B. Then, the upper end surface (joint surface) of the piezoelectric column 12 </ b> A is joined to the island-shaped convex portion 2 b of the diaphragm member 2, and the non-piezoelectric column 12 </ b> B is joined to a portion corresponding to the liquid chamber interval wall 30.
  Here, the piezoelectric member 12 is obtained by alternately stacking the piezoelectric material layers 21 and the internal electrodes 22A and 22B. The internal electrodes 22A and 22B are respectively substantially perpendicular to the end face, that is, the diaphragm member 2 of the piezoelectric member 12. By pulling out to the side surface, connecting to the end face electrodes (external electrodes) 23, 24 formed on the side face, and applying a voltage between the end face electrodes (external electrodes) 23, 24, displacement in the stacking direction occurs. For example, the external electrode 23 is used as an individual external electrode (individual electrode), and the external electrode 24 is used as a common external electrode (common electrode).
  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 by injection molding with an epoxy resin or polyphenylene sulfite is joined to the outer peripheral side of the piezoelectric actuator 100 composed of the piezoelectric member 12, the base member 13, the FPC 104, and the like. The frame member 17 is formed with the common liquid chamber 10 described above, and further, a supply port 19 for supplying ink from the outside to the common liquid chamber 10 is formed. It is connected to an ink supply source such as a cartridge.
  In the liquid ejection head configured as described above, for example, when driven by a punching method, a drive pulse voltage of 20 to 50 V is selectively applied to the drive column 12A according to an image recorded from a control unit (not shown). As a result, the driving column 12A to which the pulse voltage is applied is displaced to deform the vibration region 2a of the vibration plate member 2 in the direction of the nozzle plate 3, and the liquid in the liquid chamber 6 is changed by the volume (volume) change of the liquid chamber 6. By applying pressure, droplets are discharged from the nozzles 4 of the nozzle plate 3. As the liquid droplets are discharged, the pressure in the liquid chamber 6 decreases, and a slight negative pressure is generated in the liquid chamber 6 due to the inertia of the liquid flow at this time. Under this state, when the voltage application to the drive column 12A is turned off, the diaphragm member 2 returns to the original position and the liquid chamber 6 becomes the original shape, so that further negative pressure is generated. . At this time, ink is filled from the common liquid chamber 10 into the liquid chamber 6, and droplets are ejected from the nozzles 4 in response to the next drive pulse application.
  In addition to the above-described punching, the liquid discharge head is not limited to the pulling method (a method in which the vibrating plate member 2 is released from the pulled state and pressurized with a restoring force), and the pulling-pushing method (the vibrating plate member 2 is fixed). It can also be driven by a method such as a method of holding at an intermediate position, pulling from this position, and then extruding.
Next, a first embodiment of the present invention applied to this liquid discharge head will be described with reference to FIG. FIG. 3 is an explanatory side view of a head base member portion used for explaining the embodiment.
The head base member 13 is formed by laminating a first member 101 made of an insulating material such as a resin material and a second member 102 made of a metal material such as SUS having a rigidity higher than that of the first member 101. The piezoelectric member 12 is bonded and fixed to the member 102. By forming only the portion for fixing the piezoelectric member 12 from a metal material such as SUS, sufficient vibration damping can be obtained, and the amount of expensive metal material such as SUS can be reduced to reduce the cost. .
  On the first member 101, a wiring pattern 103 as an electric circuit is formed. Here, the wiring pattern 103 is formed on the side surface of the head base member 13 that is perpendicular to the surface that fixes the piezoelectric member 12 and the surface opposite to the surface that fixes the piezoelectric member 12.
  The wiring pattern 103 formed on the side surface of the first member 101 and the electrodes 23 and 24 of the drive column 12A of the piezoelectric member 12 are connected by an FPC 104 that is a flexible wiring board. Thus, even when a metal material is used as the high-rigidity second member 102 by connecting with the FPC 104, the FPC 104 has the effect of a jumper wire and the wiring circuit comes into contact with the second member 102. No short circuit or signal degradation will occur.
  The surface of the first member 101 opposite to the surface to be joined to the second member 102 is a driver IC 105 in which a drive circuit for supplying a drive signal to the drive column 12A of the piezoelectric member 12 is formed, and components for preventing power noise. A chip capacitor 107 is mounted. Further, the FFC 108 connects the wiring pattern 103 formed on the surface of the first member 101 opposite to the surface to be joined to the second member 102 and the control unit including the drive signal generation unit of the apparatus main body.
  In the liquid discharge head configured as described above, the second member 102 that joins and fixes the piezoelectric member 12 of the head base member 13 is formed of a rigid member. Therefore, when the piezoelectric member 12 is driven, Since the piezoelectric member 12 is securely fixed, stable droplet ejection characteristics can be obtained. Further, deformation due to heat generated when the piezoelectric member 12 is driven is suppressed, and stable droplet ejection characteristics can be obtained in this respect as well. Further, when the piezoelectric member 12 is bonded and fixed to the head base member 13 and the piezoelectric member 12 is divided into a plurality of driving columns 12A and non-driving columns 12B by dicing or the like, the piezoelectric member 12 is securely fixed to the head base member 12. The processing can be performed in the state, and the processing accuracy and the yield can be improved.
  On the other hand, since the wiring pattern 103 is formed on the first member 101 of the head base member 13, the amount of use of a flexible wiring board such as an FPC can be reduced, and the cost can be reduced.
  Further, by forming the wiring pattern 103 on the side surface of the head base member 13 that is perpendicular to the surface of the first member 101 that is bonded to the second member 102 and the surface that is opposite to the surface that is bonded to the second member 102, The wiring can be easily taken out and the head can be downsized.
  Furthermore, by joining the FPC 104, the wiring pattern 103, and the piezoelectric member 12 on the same side surface (surface perpendicular to the piezoelectric member bonding surface) of the head base member 13, the FPC area can be reduced and the cost can be further reduced. .
  Thus, the head base member is formed by laminating the first member made of an insulating material in which the electric circuit is formed and the second member having the piezoelectric member fixed and having higher rigidity than the first member, The electrical circuit formed on the first member of the head base member and the piezoelectric member are connected via a flexible wiring board, so that the rigidity on the piezoelectric member bonding side is maintained and deformation due to heat is suppressed. With this, stable droplet ejection characteristics can be obtained, and the cost can be reduced by reducing the amount of flexible wiring board used.
Next, a liquid discharge head according to a second embodiment of the present invention will be described with reference to FIG. FIG. 4 is an explanatory side view of the head base portion of the head.
In the present embodiment, a driver IC 105 in which a drive circuit for supplying a drive signal to the drive column 12A of the piezoelectric member 12 is formed on the FPC 104. The first member 102 has a recess 106 corresponding to the mounting portion of the driver IC 105.
  The signal from the driver IC 105 has a problem that the longer the transmission path, the more noise and the signal waveform become distorted. For this reason, the driver IC 105 is preferably provided near the piezoelectric member 12. Therefore, in the present embodiment, the driver IC 105 is mounted on the FPC 104 to reduce the distance to the piezoelectric member 12. In order to minimize the size of the FPC, other components (such as the chip capacitor and the bypass capacitor necessary for the power supply line of the driver IC) are not mounted on the FPC 104 but mounted on the electric circuit (wiring pattern 103 side). Like to do.
  As a result, it is possible to obtain a liquid discharge head capable of suppressing the deterioration of the drive signal and forming a high-quality image.
  Further, the driver IC 105 generates a considerable amount of heat during driving, but by mounting on the FPC 104, it is not necessary to use a heat-resistant material as the material of the first member 101, and it can be formed from an inexpensive resin material. At this time, in order to more reliably avoid the influence of the heat generation from the driver IC 105 on the first member 101, the region facing the driver IC 105 is formed by the second member 102 as shown in FIG. preferable.
  Further, in the head base in the form of FIG. 4, a material having a large heat capacity such as metal is used as the second member 102, and the driver IC 105 is brought into contact with the second member 102 to dissipate heat generated from the driver IC 105. You can also.
Next, a liquid ejection head according to a third embodiment of the present invention will be described with reference to FIG. FIG. 5 is a front explanatory view showing a connection portion between the first member 101 and the FPC 104 of the head in a transparent state.
In this embodiment, the anisotropic conductive film 120 connects the wiring pattern 103 formed on the first member 101 of the head base member 13 and the wiring pattern 110 of the FPC 104.
  In other words, if the wiring pattern 103 and the wiring pattern 110 of the FPC 104 are connected by thermocompression bonding or the like, the first member 101 on which the wiring pattern 103 is formed is made of a resin material, which may cause thermal deformation. Therefore, the first member 101 can be prevented from being deformed by using the anisotropic conductive film 120 and connecting by pressure bonding. In addition, this connection form is preferably applied to a connection portion between the FFC 108 and the first member 101.
Next, a liquid ejection head according to a fourth embodiment of the invention will be described with reference to FIG. FIG. 6 is an explanatory view showing the wiring of the FPC used in the head.
In the present embodiment, the wiring pattern 103 is formed by a molded interconnect device (MID).
  In general, the wiring formed on the resin by MID cannot be a high-density wiring that is formed on the FPC. However, by mounting the driver IC 105 on the FPC 104 as in the FPC 104 shown in FIG. 6, the MID pattern connection electrodes 121 can be arranged at a low density, and connection to the MID becomes possible. Specifically, the output signal patterns 123 connected to the individual electrodes 23 of the piezoelectric member 12 must be arranged at a high density as many as the number of piezoelectric columns 12A to be driven, but by mounting the driver IC 105 on the FPC 104, The number of the input signal wiring patterns 122 to the driver IC 105 can be greatly reduced, and the arrangement density can be lowered. For this reason, connection to MID becomes possible.
Next, an example of the image forming apparatus according to the present invention including the liquid discharge head according to the present invention will be described with reference to FIGS. FIG. 7 is an explanatory side view for explaining the entire configuration of the mechanism portion of the apparatus, and FIG. 8 is an explanatory plan view of a main portion of the mechanism portion.
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 this 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 245, and is conveyed to the conveyor belt 251 and the counter. It is sandwiched between the rollers 246 and conveyed, and further, the leading end is guided by the conveying guide 247 and pressed against the conveying belt 251 by the leading end pressure roller 249, and the conveying direction is changed by approximately 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.
  Thus, since the image forming apparatus includes the liquid discharge head according to the present invention as a recording head, stable droplet discharge characteristics can be obtained, and a high-quality image can be stably formed.
  In the above embodiment, a serial type image forming apparatus is described as an example of the image forming apparatus of the present invention. However, the present invention can be similarly applied to a line type image forming apparatus. Further, the present invention can be applied to an image forming apparatus using a liquid other than the narrowly defined ink, a fixing processing liquid, or the like.
DESCRIPTION OF SYMBOLS 1 Flow path plate 2 Vibration plate member 3 Nozzle plate 4 Nozzle 6 Individual liquid chamber 10 Common liquid chamber 12 Piezoelectric member 12A, 12B Piezoelectric column 12Ba Piezoelectric column 13 Base member 15 FPC (wiring board)
23 individual electrode 24 common electrode 101 first member 102 second member 103 wiring pattern 104 FPC (flexible wiring board)
105 Driver IC
106 Concave portion 107 Chip capacitor 108 FFC
233 ... Carriage 234 ... Recording head

Claims (7)

  1. A piezoelectric member that generates pressure to eject droplets;
    A head base member to which the piezoelectric member is fixed,
    The head base member is
    A first member made of an insulating material on which an electric circuit is formed;
    A second member having higher rigidity than the first member is laminated;
    The piezoelectric member is fixed to the second member,
    The liquid ejection head, wherein the electric circuit formed on the first member of the head base member and the piezoelectric member are connected via a flexible wiring board.
  2.   The liquid ejection head according to claim 1, wherein only the driver IC that drives the piezoelectric member is mounted on the flexible wiring board.
  3.   The liquid discharge head according to claim 1, wherein the electric circuit is a wiring pattern formed by a mold interconnect device (MID).
  4.   The wiring pattern of the electric circuit is formed on a side surface perpendicular to a surface for fixing the piezoelectric member of the head base member and a surface opposite to the surface for fixing the piezoelectric member. The liquid discharge head described.
  5.   The liquid discharge head according to claim 1, wherein a noise prevention component is mounted on an electric circuit of the head base member.
  6.   6. The liquid discharge head according to claim 1, wherein both ends of the flexible wiring board are connected to the electric circuit and the piezoelectric member on the same side surface side of the head base member.
  7.   An image forming apparatus comprising the liquid discharge head according to claim 1.
JP2011050656A 2011-03-08 2011-03-08 Liquid ejecting head and image forming apparatus Pending JP2012187720A (en)

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Citations (10)

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