JP2004314608A - Recording device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recording device which can effectively release heat generated by driving elements on a flexible wiring board. <P>SOLUTION: A heat sink 27 for radiating the heat generated from IC chips 35-38 which drive a recording head into the air is extended between a back wall 18b of a head holder 18 and a circuit board 26. Therefore, as compared with the conventional one, the heat sink 27 can be increased in the area and can be enhanced in the heat radiation effect. Moreover, a recess for avoiding legs of electronic components soldered to the circuit board 26 is formed at an opposed face to the circuit board 26 of the heat sink 27. The heat sink 27 is separated by a predetermined distance from each of the back wall 18b of the head holder 18 and the circuit board 26, so that the radiation of heat from the heat sink 27 is prevented from being obstructed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a recording apparatus, and more particularly, to a recording apparatus including a recording head that performs recording on a recording medium, a driving element that drives the recording head, and a flexible wiring board that transmits a signal from the driving element to the recording head. About.

  2. Description of the Related Art Conventionally, as a recording apparatus that performs recording on a recording medium such as paper, for example, an inkjet recording apparatus that performs print recording by ejecting ink from a nozzle of an inkjet head onto a recording medium is known. In this type of ink jet recording apparatus, a carriage that can reciprocate along a recording area is provided, and a head holder mounted on the carriage has an ink jet head, a circuit board that supplies a drive signal thereto, and a flexible wiring that connects both of them. A substrate is arranged (for example, see Patent Document 1).

  In recent years, as the number of nozzles has increased and the density has increased, the wiring connecting the driver IC that generates drive signals to the inkjet head has also become thinner and more dense, and the signals on the wiring have been affected by noise. This has increased the number of joints between the circuit board and the flexible wiring board. For this reason, the driver IC is mounted on the flexible wiring board so that the driver IC is brought as close as possible to the ink jet head (for example, see Patent Document 2).

On the other hand, as the number of nozzles increases, the amount of heat generated by the driver IC also increases, and in order to release this heat, the driver IC is brought into contact with a cover plate that covers the flexible wiring board, and the cover plate has a heat sink function. (See Patent Document 2 above).
JP-A-11-10850 JP 2002-240306 A

  In order to further increase the number of nozzles, the amount of heat generated by the driver IC is further increased, and the heat sink must be increased in size. On the other hand, a capacitor for preventing a voltage drop, a connector for connecting to a control unit on the main body side, and the like are required on the circuit board. As the number of nozzles increases, these capacitors and connectors also increase in size. Since the circuit board is an extension of the flexible wiring board, when the heat sink, the capacitor, and the like become large, they interfere with each other. When trying to reduce the size of the head holder, the size of the heat sink is limited, and there has been a problem that heat from the driver IC cannot be effectively released to the outside. If the heat dissipation from the driver IC cannot be sufficiently performed, the operation of the driver IC becomes unstable or the driver IC is damaged.

  The present invention has been made to solve the above problems, and has as its object to provide a recording apparatus provided on a flexible wiring board and capable of effectively releasing heat generated by a driving element of an inkjet head. And

  According to another aspect of the present invention, there is provided a recording apparatus that includes a plurality of recording elements and performs recording on a recording medium, a head holder that holds the recording head, and the head holder. A flexible wiring board provided along the outer surface of the substrate and having a plurality of conductive wires on a flexible band-shaped insulator and a drive element for driving the recording head; and radiating heat generated by the drive element to the outside. Wherein the heat sink is disposed between the flexible wiring board and the head holder.

  In the printing apparatus having this configuration, the flexible wiring board having the driving element for driving the printing head is provided along the outer surface of the head holder, and the heat sink is provided between the flexible wiring board and the head holder. In addition, the surface area of the heat sink can be increased, the heat generated in the driving element can be released to the outside, and a rapid rise in the temperature of the driving element can be suppressed.

  According to a second aspect of the present invention, in addition to the configuration of the recording apparatus according to the first aspect, the heat sink is provided at a predetermined distance from an outer surface of the head holder. I do.

  In the recording apparatus having this configuration, in addition to the effect of the first aspect of the present invention, a gap of a predetermined distance is provided between the heat sink and the head holder. The heat generated in the element can be released.

  In a recording apparatus according to a third aspect of the present invention, in addition to the configuration of the recording apparatus according to the first or second aspect, the head holder includes a first wall that holds the recording head, and a first wall that holds the recording head. A second wall raised from an end of the wall, and is formed substantially in an L-shape when viewed from the side. The flexible wiring board is connected to an outer surface of the second wall of the head holder. A relay board is provided, and the heat sink extends from near a connection between the end of the first wall and the second wall to between the relay board and the head holder. I do.

  In the recording apparatus having this configuration, in addition to the effect of the invention described in claim 1 or 2, the heat sink is provided between the relay substrate and the head holder from near the connection between the end of the first wall and the second wall. Since the heat sink is extended to the gap, the surface area of the heat sink can be increased, and the heat radiation effect to the outside can be enhanced.

  According to a fourth aspect of the present invention, in addition to the configuration of the recording apparatus according to the third aspect, a gap is provided between the heat sink and the relay board.

  In the recording apparatus having this configuration, in addition to the effect of the third aspect of the present invention, since a gap of a predetermined distance is provided between the heat sink and the relay board, heat is efficiently radiated from the side surface on the heat sink relay board side. You can do it.

  According to a fifth aspect of the present invention, in addition to the configuration of the recording apparatus according to any one of the first to fourth aspects, a carriage mounted with the head holder and movable along the recording medium is provided. Wherein the heat sink is arranged so that its plane is parallel to the moving direction of the carriage.

  In the recording apparatus having this configuration, in addition to the operation of the invention according to any one of claims 1 to 4, a carriage movable along the recording medium is provided. Since they are disposed so as to be parallel to each other, when the carriage is driven, air flows near the surface of the heat sink, and the heat radiation effect to the outside of the heat sink can be enhanced.

  In a recording apparatus according to a sixth aspect of the present invention, in addition to the configuration of the recording apparatus according to any one of the first to fifth aspects, a cover provided on the head holder for protecting the flexible wiring board is provided. An elastic member provided between the drive element and the cover, wherein the drive element is pressed toward the heat sink by a pressing force of the elastic member.

  In the recording apparatus having this configuration, in addition to the function of the invention described in any one of the first to fifth aspects, an elasticity is provided between the cover provided on the head holder for protecting the flexible wiring board and the driving element. A member is provided, and the driving element is pressed toward the heat sink by pressing the elastic member, so that the driving element and the heat sink can be brought into close contact with each other.

  Further, in the recording apparatus of the invention according to claim 7, in addition to the configuration of the recording apparatus according to claim 3 or 4, the second wall extends from the first wall in a direction opposite to the direction of gravity. Along the second wall, the heat sink also extends in the direction opposite to the direction of gravity from the vicinity of the connection between the end of the first wall and the second wall.

  In the recording apparatus having this configuration, in addition to the function of the invention described in claim 3 or 4, the second wall extends in the direction opposite to the direction of gravity from the first wall, and the heat sink is also located at the end of the first wall. The surface of the heat sink is parallel to the driving direction of the carriage, and the air flows near the surface of the heat sink during driving, and the heat sink extends from the vicinity of the connection between the portion and the second wall in the direction opposite to the direction of gravity. The heat radiation effect to the outside can be enhanced.

  Further, in the recording apparatus according to an eighth aspect of the present invention, in addition to the configuration of the recording apparatus according to any one of the first to seventh aspects, the vicinity of a portion of the heat sink facing the drive element is connected to the head holder. It is characterized by non-contact.

  In the recording apparatus having this configuration, in addition to the operation of the invention according to any one of claims 1 to 7, since the vicinity of the portion of the heat sink facing the drive element is not in contact with the head holder, the heat of the heat sink is Does not transmit to the holder.

  In a recording apparatus according to a ninth aspect of the present invention, in addition to the configuration of the recording apparatus according to any one of the third to eighth aspects, the head holder is provided at right angles to the left and right sides of the second wall. A pair of raised side walls are provided, and cutouts for flowing a space between the outer surface of the second wall and the heat sink to the outside are provided on the pair of left and right side walls near the heat sink. It is characterized by having.

  In the recording apparatus having this configuration, in addition to the operation of the invention according to any one of claims 3 to 8, air in the space between the outer side surface of the second wall and the heat sink is provided on the pair of left and right side walls. It becomes easier to circulate with the outside through the cut-out portion, and the temperature rise in this space is suppressed.

  As described in detail above, in the recording apparatus according to the first aspect of the present invention, the flexible wiring board having the driving element for driving the recording head is provided along the outer surface of the head holder. Since the heat sink is provided between the heat sink and the heat sink, the surface area and volume of the heat sink can be increased, so that the heat radiation effect can be enhanced and the rapid temperature of the drive element can be suppressed, so that stable driving can be performed. it can.

  In the recording apparatus according to the second aspect, in addition to the effects of the first aspect, a gap of a predetermined distance is provided between the heat sink and the head holder, and the driving element is provided in the gap. Since the heat generated in the step (1) can be released, stable driving can be performed.

  Further, in the recording apparatus according to the third aspect, in addition to the effects of the first or second aspect, the heat sink is relayed from near the connection between the end of the first wall and the second wall. Since the heat sink extends between the substrate and the head holder, the surface area of the heat sink can be increased, and the effect of radiating heat to the outside can be enhanced. Therefore, the recording apparatus can perform stable driving.

  In the recording apparatus according to the fourth aspect of the present invention, in addition to the effect of the third aspect of the present invention, since a gap of a predetermined distance is provided between the heat sink and the relay board, the recording device generates Since the generated heat can be efficiently released from the side surface on the side of the heat sink relay substrate, the recording apparatus can perform stable driving.

  According to a fifth aspect of the present invention, in addition to the effects of any one of the first to fourth aspects, the recording apparatus further includes a carriage movable along the recording medium. Are arranged so as to be parallel to the moving direction of the carriage, so that when the carriage is driven, air flows near the surface of the heat sink and the effect of radiating heat to the outside of the heat sink can be enhanced.

  According to the recording apparatus of the present invention, in addition to the effects of the invention according to any one of the first to fifth aspects, a cover provided on a head holder for protecting the flexible wiring board, and a driving element An elastic member is provided between the drive member and the elastic member.The drive element is pressed toward the heat sink by the pressing of the elastic member, and the drive element and the heat sink are in close contact with each other, so that the heat generated in the drive element is efficiently transmitted to the heat sink. Can be released to the outside.

  In the recording apparatus according to the seventh aspect of the present invention, in addition to the effects of the third or fourth aspect, the second wall extends in the direction opposite to the direction of gravity from the first wall, and the heat sink is also provided. The surface of the heat sink extends in the direction opposite to the direction of gravity from near the connection between the end of the first wall and the second wall, and the surface of the heat sink is parallel to the driving direction of the carriage. Therefore, the effect of radiating heat to the outside of the heat sink having high heat can be enhanced.

  Further, in the recording apparatus according to the eighth aspect of the present invention, in addition to the effects of the invention according to any one of the first to seventh aspects, the vicinity of a portion of the heat sink facing the drive element is not in contact with the head holder, Since the heat of the heat sink, which has become hot, is not transmitted to the head holder, the heat generated by the drive element can be released only into the air.

  Further, in the recording apparatus according to the ninth aspect, in addition to the effect of the third aspect, the air in the space between the outer surface of the second wall and the heat sink can be reduced. It becomes easy to circulate with the outside through the cutouts provided in the pair of left and right side walls, and the temperature rise in this space is suppressed, so that the heat radiation effect of the heat sink can be enhanced.

  Hereinafter, an embodiment of the recording apparatus of the present invention will be described with reference to the drawings. First, an internal configuration of an ink jet printer 1 which is an embodiment of the recording apparatus of the present invention will be described with reference to FIG. FIG. 1 is a perspective view showing the internal structure of the inkjet printer 1.

  As shown in FIG. 1, a carriage 8 that reciprocates in the width direction of a recording sheet P as a recording medium is provided inside the housing 2 of the inkjet printer 1. The carriage 8 is slidably supported by a guide rod 11 and a guide member 12 extending in the longitudinal direction of the housing 2. The carriage 8 is fixed to an endless belt 13 stretched in the longitudinal direction of the housing 2, and when the endless belt 13 is driven by the CR motor 16, the carriage 8 reciprocates along the guide rod 11. You.

  A recording head unit 17 having recording heads 19, 20, 21, and 22 (see FIG. 2) for performing recording such as printing is attached to the carriage 8. The recording heads 19 to 22 are of an ink jet type in which four colors of ink (cyan c, magenta m, yellow y, and black b) are ejected onto recording paper P as a recording medium by ejecting ink droplets to perform a recording operation. The recording paper P is provided with cyan, magenta, yellow, and black ejection nozzle groups 7a to 7h (see FIG. 2) for ejecting the respective color inks.

  In the recording head unit 17, four ink cartridges 14y, 14m, 14c, and 14b for supplying inks of respective colors are detachably mounted on the respective ejection nozzle groups 7a to 7h. Further, in the inkjet printer 1 of the present embodiment, a platen roller 10 for conveying the recording paper P is provided at a position facing the recording heads 19 to 22, and the platen roller 10 is driven by a line feed motor (not shown). The recording paper P is transported in a paper transport direction orthogonal to the moving direction of the carriage 8 by the rotation of the platen roller 10.

  Next, the structure of the recording head unit 17 will be described with reference to FIGS. FIG. 2 is a perspective view of the recording head unit 17 as viewed from the back side of the bottom, and FIG. 3 is a perspective view showing a state where the resin cover 24 is removed from the recording head unit 17. As shown in FIG. 2, the recording head unit 17 includes a resin-made head holder 18, recording heads 19 to 22 each composed of a plate-type piezoelectric actuator, and ejection nozzle groups that are externally fitted to the recording heads 19 to 22. A metal head cover 25 having a rectangular opening corresponding to 7a to 7h, a circuit board 26, a heat sink 27, a resin cover 24, and the like are assembled. As shown in FIG. 3, the recording heads 19 to 22 and the circuit board 26 are connected by flexible wiring boards 31, 32, 33, and 34, respectively. Then, as shown in FIG. 2, a resin cover 24 is fixed so as to cover the flexible wiring boards 31 to 34 in order to protect these flexible wiring boards 31 to 34. The head holder 18 is held by the carriage 8 shown in FIG. 1 and can reciprocate with the carriage 8 along the guide rod 11.

  Next, the structure of the head holder 18 will be described with reference to FIGS. FIG. 4 is an exploded perspective view of the recording head unit 17, and FIG. 5 is a perspective view of the head holder 18. As shown in FIGS. 4 and 5, the head holder 18 is integrally formed of a synthetic resin material, and includes a bottom wall 18a, a back wall 18b, a left side wall 18c, a right side wall 18d, and a front wall 18e. It is formed in a substantially box-shaped shape. The back wall 18b, the left side wall 18c, the right side wall 18d, and the front wall 18e each extend from the bottom wall 18a in a direction opposite to the direction of gravity.

  The above-described ink cartridges 14y, 14m, 14c, and 14b are removably mounted on the opening of the head holder 18. As shown in FIG. 4, a head holder 28 is formed on the outer surface of the bottom wall 18a of the head holder 18 so as to protrude therefrom. The four recording heads 19 to 22 for performing the above are adhesively fixed side by side, and a head cover 25 is fitted on the outside thereof. Further, a heat sink 27 is adhered and fixed to the outer surface of the back wall 18b, and is separated from the heat sink 27 by a predetermined distance (for example, 3 mm) so that the recording heads 19 to 22 and a wiring board (not shown) on the carriage 8 side. The circuit board 26 serving as a relay board is fixed.

  As shown in FIG. 5, the bottom wall 18a of the head holder 18 has ink supply passages 19a, 20a, which can be connected to ink discharge portions (not shown) of the ink cartridges 14y, 14m, 14c, 14b. 21a and 22a are provided. Each of the ink supply passages 19a to 22a penetrates the bottom wall 18a and opens to the head holding portion 28, and is connected to an ink flow path corresponding to each of the ejection nozzle groups 7a to 7h of each of the recording heads 19 to 22. .

  Further, as shown in FIG. 4, cylindrical bosses 18f and 18g are formed near the center of the left and right ends of the outer surface of the back wall 18b of the head holder 18. Using the bosses 18f and 18g, the circuit board 26 is fixed at a distance from the back wall 18b by screws (not shown). In addition, as shown in FIG. 4, a convex portion 18j, a convex portion 18k, and a convex portion 18m are formed on the outer periphery of the back wall 18b of the head holder 18, respectively.

  The carriage 8 is provided with a wiring board (not shown) via a flexible wiring board (not shown) on a main body side control board (not shown) fixed in the housing 2 of the printer. The connection portion (not shown) of the wiring board is connected to the connector 41 (see FIG. 2) of the circuit board 26 provided on the head holder 18, and the wiring board of the carriage 8 is connected to the main body side control board. Power and signals are supplied to the circuit board 26 via the power supply.

  Each of the recording heads 19 to 22 has a known structure similar to the head described in Patent Document 2, and includes a cavity plate having a large number of ink chambers communicating with the ejection nozzles 7a to 7h, and electrodes corresponding to the respective ink chambers. With the structure in which the plate-type piezoelectric actuators having the above are stacked, ink can be ejected as droplets from the ejection nozzles 7a to 7h by selectively applying a drive signal to each electrode. Each of the flexible wiring boards 31 to 34 has a structure in which a plurality of conductive wires are formed on a flexible band-shaped insulator (for example, a polyimide resin), and each of the conductive wires is formed on a piezoelectric actuator. Connected and fixed. On the surface of each of the flexible wiring boards 31 to 34 opposite to the heat sink 27 side, IC chips 35 to 38 are mounted as drive elements. The IC chips 35 to 38 convert the drive waveform signal serially transferred from the control circuit on the main body side into a parallel signal corresponding to each electrode of the piezoelectric actuator and convert it into a predetermined voltage value and connected to each electrode. Output to the conductor.

  Next, the structure of the circuit board 26 will be described with reference to FIGS. The circuit board 26 is made of a rigid substrate such as glass epoxy. On the circuit board 26, a large number of wirings made of a copper thin film, electrolytic capacitors 43 and 44, connectors 41 and 42, and the like are provided. I have.

  Next, the structure of the heat sink 27 will be described with reference to FIGS. FIG. 6 is a plan view of the heat sink 27. As shown in FIGS. 4 and 6, the heat sink 27 is formed of an aluminum plate which is a metal having high heat dissipation efficiency, is substantially rectangular in plan view, has a part bent, and has a “U-shaped” shape in side view. The contact portions 27k of the IC chips 35 to 38 are formed. As shown in FIG. 6, on the surface of the heat sink 27, the feet of the electronic component soldered to the circuit board 26 fixed to the outside of the heat sink 27 or the electronic component provided on the heat sink 27 side of the circuit board 26. Recesses 27a, 27b, 27c, 27d are formed in order to avoid interference. Further, a through hole 27e is formed at the center of the concave portion 27d. The recesses 27a, 27b, 27c may be formed as openings.

  Further, as shown in FIG. 6, a notch 27g, a notch 27h, a notch 27f, a notch 27i, and a notch 27j are formed on each side forming the outer periphery of the heat sink 27, respectively.

  Next, details of the attachment of the circuit board 26, the heat sink 27, and the resin cover 24 to the head holder 18 will be described with reference to FIGS. FIG. 7 is a cross-sectional view taken along the line AA ′ shown in FIG. 2, and FIG. 8 is an enlarged cross-sectional view showing the vicinity of the IC chip 38 taken along the line AA ′ shown in FIG. is there. As shown in FIGS. 2 to 4, 7 and 8, a heat sink 27 is first fixed to the back wall 18 b of the head holder 18. At this time, the bosses 18f and 18g penetrate through the through hole 27e and the notch 27f of the heat sink 27, and the protrusions 18j, 18k and 18m of the head holder 18 fit into the notches 27g, 27h and 27i, respectively. I do. Then, the heat sink 27 is adhesively fixed near the convex portions 18j, 18k, 18m. As shown in FIG. 3, a gap is formed between the outer peripheral portion of the contact portion 27k of the heat sink 27 and each wall of the head holder 18, and heat of the contact portion 27k of the heat sink 27 is It is not transmitted to. A gap of a predetermined distance (for example, about 3 mm) is also formed between the heat sink 27 and the back wall 18b of the head holder 18. Therefore, in addition to the heat radiation from the heat sink 27 to the outside, the heat radiation from the heat sink 27 is also possible in this gap.

  Next, as shown in FIG. 3, the recording heads 19, 20, 21, 22 are bonded and fixed to the head holding portion 28 of the head holder 18, and the circuit board 26 is attached to the bosses 18f, 18g along the outside of the heat sink 27. It is fixed using a screw (not shown). At this time, the flexible wiring boards 31 to 34 abut on the abutting portions 27k of the heat sink 27. Further, a gap of a predetermined distance is formed between the circuit board 26 and the heat sink 27. Next, as shown in FIG. 2, the resin cover 24 is bonded and fixed to the head holder 18 so as to cover the flexible wiring boards 31 to 34 in order to prevent the flexible wiring boards 31 to 34 from being damaged. As shown in FIG. 8, a sponge 50, which is an elastic member that is in contact with the IC chips 35 to 38 and presses the IC chips 35 to 38, is provided on the back surface of the resin cover 24, as shown in FIG. . Therefore, when the resin cover 24 is bonded and fixed to the head holder 18, the sponge 50, which is an elastic member, is compressed and presses the IC chips 35 to 38.

  Accordingly, as shown in FIG. 8, the sponge 50 of the resin cover 24 presses the IC chips 35 to 38, respectively, and the IC chips 35 to 38 are made of a flexible wiring board 31 made of a polyimide resin which is a thin resin having good heat conductivity. Through the contact portion 27k of the heat sink 27. Therefore, the heat generated in the IC chips 35 to 38 by the driving of the recording heads 19 to 22 passes through the flexible wiring boards 31 to 34 from the contact portion 27k of the heat sink 27 to a wider area and a larger volume than the conventional heat sink. And is radiated to the air.

  As shown in FIGS. 7 and 8, the heat sink 27 and the back wall 18b of the head holder 18 are separated by a predetermined distance (for example, 3 mm), and the heat sink 27 and the circuit board 26 are also separated from each other. It is separated by a predetermined distance (for example, 3 mm), so that heat radiation from the heat sink 27 is not hindered. Further, the head holder 18 also moves in the left-right direction as the carriage 8 moves in the left-right direction, so that air flows in the gap between the heat sink 27 and the circuit board 26, and the heat radiation effect from the heat sink 27 is enhanced. be able to.

  As described above, in the ink jet printer 1 of the present embodiment, the heat sink 27 that radiates heat generated from the IC chips 35 to 38 that drive the plate-type piezoelectric actuators provided on the recording heads 19 to 22 into the air. Is extended between the back wall 18b of the head holder 18 and the circuit board 26, so that the heat sink 27 can be made larger in area and volume as compared with the conventional heat sink 27, so that the heat radiation effect can be enhanced. Also, on the surface of the heat sink 27 facing the circuit board 26, recesses 27a, 27b, 27c, and 27d are formed to avoid the feet and the like of the electronic component soldered to the circuit board 26. It is possible to prevent the heat sink 27 from coming into contact with the components provided on the surface of the heat sink 27 of the circuit board 26 on the side of the heat sink 27. Further, since the heat sink 27 is separated from the back wall 18b of the head holder 18 and the circuit board 26 by a predetermined distance, heat radiation from the heat sink 27 is not hindered.

  Next, a modified example of the head holder 18 will be described with reference to FIG. FIG. 9 is an exploded perspective view showing a modified example of the head holder 18. The structure of the modified example of the head holder 18 shown in FIG. 9 is different from that of the head holder shown in FIG. 4 in that notched portions 18n, 18p, 18o, and 18q, which will be described later, are newly provided on the left side wall 18c and the right side wall 18d. Since the configuration is the same as that of No. 18, different points will be described below.

  As shown in FIG. 9, the head holder 18 is provided with a pair of left and right side walls 18c and 18d. The end 18c1 of the left side wall 18c on the heat sink 27 side and the side of the right side wall 18d on the heat sink 27 side. 18d1 are a pair of side walls that rise perpendicularly from the left and right sides of the back wall 18b. Substantially rectangular notches 18n and 18p are formed at the end 18c1 of the left side wall 18c, and substantially rectangular notches 18o and 18q are formed at the end 18d1 of the right side wall 18d. By providing the notches 18n, 18p, 18o, and 18q, the air in the space between the outer surface of the back wall 18b and the heat sink 27 can easily flow to the outside, and a rise in temperature in this space is suppressed. it can. Therefore, it is possible to enhance the heat radiation effect from the heat sink 27 into this space. In the example shown in FIG. 9, two cutouts are provided on each of the left side wall 18c and the right side wall 18d, but one cutout may be provided.

  Note that the present invention is not limited to the above embodiment, and various modifications are possible. For example, the present invention is not limited to a printer using a plate-type piezoelectric actuator for a recording head, but can be applied to various printers provided with a driving element for driving the recording head. Further, the number of driving elements for driving the recording head is not limited to four, and can be applied to an arbitrary number such as two or six.

FIG. 1 is a perspective view showing the internal structure of the inkjet printer 1. FIG. 2 is a perspective view of the recording head unit 17 as viewed from the rear side of the bottom. FIG. 3 is a perspective view showing a state in which the resin cover 24 has been removed from the recording head unit 17. FIG. 4 is an exploded perspective view of the recording head unit 17. FIG. 5 is a perspective view of the head holder 18. FIG. 6 is a plan view of the heat sink 27. FIG. 7 is a cross-sectional view taken along line A-A ′ shown in FIG. FIG. 8 is an enlarged cross-sectional view of the vicinity of the IC chip 38 taken along the line A-A ′ shown in FIG. FIG. 9 is an exploded perspective view showing a modified example of the head holder 18.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Ink-jet printer 2 Case 7a-7h Injection nozzle group 8 Carriage 17 Recording head unit 18 Head holder 18a Bottom wall 18b Back wall 19-22 Recording head 24 Resin cover 26 Circuit board 27 Heat sink 27a-27d Depression 27k Contact part 28 head Holder 31-34 Flexible wiring board 35-38 IC chip 18n-18q Notch

Claims (9)

A recording head having a plurality of recording elements and performing recording on a recording medium,
A head holder for holding the recording head,
A flexible wiring board provided along the outer surface of the head holder and including a plurality of conductive wires on a flexible band-shaped insulator and a driving element for driving the recording head;
A heat sink that emits heat generated by the drive element to the outside,
The recording apparatus, wherein the heat sink is disposed between the flexible wiring board and the head holder.   The recording apparatus according to claim 1, wherein the heat sink is provided at a predetermined distance from an outer surface of the head holder. The head holder includes a first wall that holds the recording head, and a second wall that is raised from an end of the first wall, and is formed substantially in an L shape in side view.
A relay board to which the flexible wiring board is connected is provided on an outer surface of the second wall of the head holder,
The said heat sink is extended from the vicinity of the connection part of the edge part of the said 1st wall and the said 2nd wall to between the said relay board and a head holder, The Claim 1 or 2 characterized by the above-mentioned. The recording device according to the above.   4. The recording apparatus according to claim 3, wherein a gap is provided between the heat sink and the relay board. The head holder is mounted, comprising a carriage movable along the recording medium,
The recording apparatus according to claim 1, wherein the heat sink is disposed so that a plane thereof is parallel to a moving direction of the carriage. A cover provided on the head holder to protect the flexible wiring board,
An elastic member provided between the drive element and the cover,
The recording device according to claim 1, wherein the driving element is pressed toward the heat sink by a pressing force of the elastic member.   The second wall extends from the first wall in a direction opposite to the direction of gravity, and along the second wall, the heat sink is also connected between an end of the first wall and the second wall. The recording device according to claim 3, wherein the recording device extends from the vicinity of the connection portion in a direction opposite to the direction of gravity.   The recording apparatus according to claim 1, wherein a portion of the heat sink near a portion facing the drive element is not in contact with the head holder. The head holder is provided with a pair of side walls rising perpendicularly from right and left of the second wall, respectively.
The notch for flowing the space between the outer surface of the second wall and the heat sink to the outside is provided on each of the pair of left and right side walls near the heat sink. 9. The recording device according to any one of items 3 to 8.

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