JP5927961B2 - Droplet discharge device - Google Patents

Description

  The present invention relates to a droplet discharge device such as an ink jet recording apparatus that employs a differential signal transmission method as a transmission method of a drive signal for printing.

  For example, in an ink jet recording apparatus (droplet discharge apparatus), there is a demand to increase the number of nozzles in order to realize high-precision and high-quality printing. When the number of nozzles is increased in this way, the number of drive signals for printing increases. Therefore, as a drive signal transmission method, for example, a transmission method using a differential signal such as LDVS (low voltage differential signal transmission method) is used. It is known to adopt (for example, refer to Patent Document 1).

  By the way, in the case of a transmission method using a differential signal, a termination resistor that suppresses reflection of the differential signal is provided. However, in the recording apparatus described in Patent Document 1, a termination resistor that suppresses reflection of the differential signal. The device is incorporated in the head unit and integrated as a unit.

Japanese Patent Laying-Open No. 2011-046160 (see FIG. 1)

  If such a termination resistor is integrated as a unit, if the differential signal characteristics vary, if you try to change the resistance value of the termination resistor to suppress it, replace the entire unit. There is a need to. Replacing the entire unit causes a significant cost increase. Therefore, even if the variation in the differential signal characteristics occurs, it is difficult to change the actual resistance value of the termination resistor, and as a result, the variation in the differential signal characteristics cannot be sufficiently suppressed.

  According to the present invention, in a droplet discharge device that employs a differential signal transmission method, the differential signal is transmitted from the control board to the signal supply unit, and the transmission unit includes a wiring connected to the signal supply unit. An object of the present invention is to suppress variations in differential signal characteristics by providing the termination resistor in the wiring.

According to a first aspect of the present invention, there is provided a droplet discharge head having pressure applying means for selectively applying a pressure for discharging droplets from a plurality of nozzles, and a differential signal for driving the droplet discharge head. A droplet ejection device having a control board for outputting the liquid droplet ejection apparatus, connected to the pressure application means and the control board, and driving the pressure application means by receiving the differential signal output from the control board A signal supply means for supplying a driving signal to the pressure applying means, a transmission section for transmitting the differential signal from the control board to the signal supply means, and a wiring connected to the signal supply means; A transport unit configured to transport a medium to be ejected in a feed direction; and a carriage mounted with the droplet ejection head and reciprocating in a movement direction orthogonal to the feed direction, and the transmission unit is connected to the wiring. The above A termination resistor that suppresses reflection of the differential signal output from the control board to the signal supply means; and a wiring board that is connected to the pressure applying means and is mounted with the termination resistor and having the wiring; A carriage board mounted on a carriage and having a connector for connecting the wiring board, and the carriage board has a medium detection for detecting the discharged medium at a position upstream of the connector in the feed direction. A sensor is disposed, and an electrolytic capacitor is disposed on the carriage substrate in the moving direction along with the center of the connector in the feed direction, and the wiring board is orthogonal to the feed direction and the move direction. When viewed from the orthogonal direction, the connector is aligned with the electrolytic capacitor and is located downstream of the electrolytic capacitor in the feed direction. Characterized in that it is drawn from. Here, the differential signals include those transmitted by a transmission method such as LVDS (Low Voltage Differential Signaling), RSDS (Reduced Swing Differential Signaling), mini-LVDS (mini-Low Voltage Differential Signaling).

  According to this configuration, the differential signal is transmitted from the control board to the signal supply means, and is connected to the wiring in a transmission section having a wiring connected to the signal supply means, and the signal supply means from the control board. Unlike the case where it is integrated as a unit, a termination resistor can be selected and used for each wiring. It is easy to change the resistance value of the termination resistor by replacement or the like, and it is possible to easily suppress variation in the differential signal characteristics by changing the resistance value.

Further , although the electrolytic capacitor is arranged side by side with the center of the feeding direction of the connector, the wiring board is aligned with the electrolytic capacitor when viewed from the orthogonal direction orthogonal to the feeding direction and the moving direction, Since it is pulled out from the connector so as to be positioned downstream of the electrolytic capacitor in the feeding direction, interference with the electrolytic capacitor is avoided when the wiring board is pulled out.

According to a second aspect of the present invention, there is provided a droplet discharge head having pressure applying means for selectively applying a pressure for discharging droplets from a plurality of nozzles, and a differential signal for driving the droplet discharge head. A droplet ejection device having a control board for outputting the liquid droplet ejection apparatus, connected to the pressure application means and the control board, and driving the pressure application means by receiving the differential signal output from the control board A signal supply means for supplying a driving signal to the pressure applying means, a transmission section for transmitting the differential signal from the control board to the signal supply means, and a wiring connected to the signal supply means; A transport unit configured to transport a medium to be ejected in a feed direction; and a carriage mounted with the droplet ejection head and reciprocating in a movement direction orthogonal to the feed direction, and the transmission unit is connected to the wiring. The above A termination resistor that suppresses reflection of the differential signal output from the control board to the signal supply means; and a wiring board that is connected to the pressure applying means and is mounted with the termination resistor and having the wiring; A carriage board mounted on a carriage and having a connector for connecting the wiring board, wherein the wiring board connects the two output terminal parts from the input terminal part connected to the connector, and the termination resistor in the middle A plurality of wirings to which the device is connected, the two output terminal portions are arranged side by side in the feeding direction, and the wiring board has a center of the input terminal portion in the feeding direction in the feeding direction. The distance between one of the two output terminal portions is shifted and arranged so as to be shorter than the distance between the other of the two output terminal portions; Wiring that is arranged so as to conform to the shape of the wiring substrate, the wiring length is arranged to be equal, it may be configured.
In this way, the two output terminal portions are connected from the input terminal portion, and the wiring length of the wiring to which the termination resistor is connected in the middle thereof is made equal, so that the differential signal characteristics (for example, It is possible to suppress variations in transmission time. In addition, the wiring board has a shape in which the center of the input terminal portion in the feed direction is shifted from the center of the line connecting the two output terminal portions in the feed direction. Thus, the degree of freedom of layout is increased, and it is possible to avoid interference with other components arranged around the wiring board.

According to a third aspect of the present invention, there is provided a droplet discharge head having pressure applying means for selectively applying a pressure for discharging droplets from a plurality of nozzles, and a differential signal for driving the droplet discharge head. A droplet ejection device having a control board for outputting the liquid droplet ejection apparatus, connected to the pressure application means and the control board, and driving the pressure application means by receiving the differential signal output from the control board A signal supply means for supplying a driving signal to the pressure applying means, a transmission section for transmitting the differential signal from the control board to the signal supply means, and a wiring connected to the signal supply means; The transmission unit is connected to the wiring and is connected to the termination resistor for suppressing reflection of the differential signal output from the control board to the signal supply unit, and connected to the pressure application unit, and the termination Resistor is real A wiring board having the wiring, the wiring board having a first wiring board having two input terminal parts and two output terminal parts electrically connected to the control board, and the two output terminals. A second wiring board having two connection terminal portions respectively connected to the portion, wherein the droplet discharge head is connected to the pressure applying means and in a first direction orthogonal to a nozzle surface on which the nozzle is provided And a second wiring board provided so that the two connection terminal portions are arranged in a second direction parallel to the nozzle surface, and the termination resistor includes the 2 The two output terminal portions are arranged so as to form two rows side by side in a third direction orthogonal to the first direction and the second direction .
In this way, the amount of transmission can be increased by using two signal supply means, and the terminating resistors form two rows side by side in the feed direction corresponding to the two output terminal portions. Therefore, no special space is required for arranging the termination resistor.

According to a fourth aspect of the present invention, the wiring board includes the first wiring board having the input terminal portion and the two output terminal portions, the two signal supply units, and the two output terminal portions. Connected to the pressure applying means, bent in a ring shape so as to be aligned with the liquid droplet ejection head in a direction orthogonal to the feeding direction and the moving direction, and the two signal supply means are provided in parallel to the feeding direction. A second wiring board that is positioned so as to sandwich the two signal supply means together with the droplet discharge head in the orthogonal direction, and is in contact with the two signal supply means. A heat sink for cooling the supply means is further provided, and the termination resistors are arranged so as to form two rows side by side in the feed direction corresponding to the two output terminal portions. It can be configured.

  6. The liquid droplet ejection head of the first wiring board according to claim 5, wherein a plurality of the termination resistors are mounted on the first wiring board, and the first wiring board is disposed between the plurality of termination resistors. An opening for positioning with respect to the surface is formed.

  In this case, an opening for positioning the first wiring board with respect to the droplet discharge head so as not to affect the plurality of termination resistors mounted on the first wiring board. Can be arranged.

  Further, according to a sixth aspect of the present invention, there is provided a pressing member that is disposed so as to sandwich the second wiring board together with the pressure applying unit in the orthogonal direction, and presses the second wiring board against the pressure applying unit. Furthermore, it can be set as the structure by which the positioning pin inserted in the said opening is provided further in the said pressing member.

  If it does in this way, the positioning pin inserted in the opening of a said 1st wiring board can be provided using the holding member which presses down a 2nd wiring board to the said pressure provision means.

According to a seventh aspect of the present invention, the pressing member has a surface opposite to the droplet discharge head in the orthogonal direction, and the second wiring board is formed on the surface of the pressing member. The first wiring board is connected to the second wiring board so that the termination resistor faces the surface of the pressing member; and the positioning pin is And a positioning part that supports the first wiring board and the second wiring board, and the positioning pin protrudes from the surface so that the positioning part is separated from the surface of the pressing member. A space may be formed between the first and second wiring boards and the surface of the pressing member.

  If it does in this way, at the time of manufacture, when connecting the 1st and 2nd wiring board, the space required in order to insert the heater receiving stage of a well-known welding equipment is the 1st and 2nd Between the connection part of a wiring board and the said surface of the said pressing member, it is ensured reasonably regarding a positioning part.

  As described above, the present invention transmits the differential signal from the control board to the signal supply means, and is connected to the transmission section having a wiring connected to the signal supply means. Since a termination resistor that suppresses reflection of the differential signal output to the supply means is provided, the termination resistor can be selected and used for each wiring, unlike the case of being integrated as a unit. However, it is easy to change the resistance value of the termination resistor by replacement or the like, and this change is advantageous in suppressing variation in the differential signal characteristics.

1 is a schematic configuration diagram of an ink jet recording apparatus which is an embodiment of a droplet discharge apparatus according to the present invention. FIG. 3 is a perspective view showing a state where a recording head, a wiring board, a heat sink, and the like are provided on the carriage. FIG. FIG. 3 is a perspective view showing a state where a recording head, a buffer tank, and a carriage control plate are assembled, with a carriage omitted. FIG. 3 is a perspective view of a state in which a wiring board and a reinforcing frame are provided on the recording head. FIG. 3 is a perspective view of a state in which a recording board is provided with a wiring board, a pressing member, and a reinforcing frame. It is a top view of the 1st flexible wiring board. It is a perspective view of a carriage control plate.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic configuration diagram of an ink jet recording apparatus which is an embodiment of a droplet discharge apparatus according to the present invention.

  As shown in FIG. 1, an ink jet recording apparatus 1 includes a carriage 3 that reciprocates in a moving direction A (scanning direction) along a guide rod 2, and a recording head 4 (droplet discharge head) attached to the lower surface of the carriage 3. ). In this recording apparatus 1, ink is ejected from the nozzles of the recording head 4 that reciprocates in the movement direction A together with the carriage 2 toward the recording paper P conveyed in the feeding direction B orthogonal to the movement direction A. Images, characters and the like are recorded on the recording paper P. Further, the recording paper P on which images, characters, and the like are recorded is discharged in the feeding direction B by the transport roller 5 (transport means).

  As shown in detail in FIGS. 2 and 3, the carriage 3 has a substantially box-shaped portion whose upper surface side is opened, and the bottom surface portion 3 </ b> A lower side corresponding to the opening formed in the bottom surface portion 3 </ b> A of the portion. The recording head 4 is attached to the recording head 4 via the reinforcing frame 10, and a pressing member 6, a heat sink 7, and a buffer tank 8 (see FIG. 4) for temporarily storing ink are provided on the upper side of the recording head 4 in order from the lower side. It has been. A carriage substrate 9 is disposed above the buffer tank 8.

  As shown in FIGS. 2 and 3, the recording head 4 includes a flow path unit 11 and a piezoelectric actuator 12 (pressure applying means) in order from the lower side. The channel unit 11 forms an ink channel through which ink introduced from the ink introduction port flows, and has a plurality of nozzles that eject ink (droplets) on the lower surface. The reinforcing frame 10 has a rectangular shape that is slightly larger than the flow path unit 11, has an opening 10a corresponding to the ink introduction port, and the piezoelectric actuator 12 is accommodated in the opening 10b at the center. ing.

  The piezoelectric actuator 12 selectively applies pressure for discharging droplets from the plurality of nozzles. Connected to the upper surface of the actuator 12 is the other end of the wiring board 13 whose one end is connected to the carriage substrate 9. The wiring board 13 has two driving ICs 14 (signal supply means), and each driving IC 14 is output from the carriage board 9 (specifically, the connector 21 on the carriage board 9) through the wiring of the wiring board 13. A differential signal for driving the recording head 4 is input, and a driving signal for driving the piezoelectric actuator 12 is supplied to the recording head 4 (piezoelectric actuator 12).

  A pressing member 6 that presses the wiring board 13 against the piezoelectric actuator 12 is provided above the portion of the wiring board 13 that is connected to the piezoelectric actuator 12.

  The pressing member 6 has a size corresponding to the piezoelectric actuator 12 in a plan view, and sandwiches the wiring board 3 together with the piezoelectric actuator 12 in the orthogonal direction (that is, the vertical direction) orthogonal to the moving direction A and the feeding direction B. Is to be placed. The pressing member 6 presses the wiring board 3 against the piezoelectric actuator 12 so that the connection part of the wiring board 13 to the piezoelectric actuator 12 is not easily peeled off from the piezoelectric actuator 12.

  As shown in FIGS. 5 and 6, the pressing member 6 has a rectangular plate-like base portion 6 </ b> A, and the lower surface of the base portion 6 </ b> A is on the connection portion of the first and second flexible wiring boards 15 and 16. Placed. A pair of convex portions 6B is provided on the upper portion of the base portion 6A. When the pressing member 6 is placed on the upper side of the connection portion, the pair of convex portions 6B are the first flexible wiring board of the base portion 6A. It is located so that it may extend in parallel in both sides of 15 width directions. A portion sandwiched between the pair of convex portions 6B becomes a concave portion 6C that is recessed downward with respect to the upper surface of the convex portion 6B, and two positioning pins 6a are provided in the concave portion 6C so as to protrude upward. Thus, the dead space of the recess 6C is effectively used for the positioning pin 6a. In addition, the pressing member 6 has four vertical walls 6D standing from the outer edge of the base portion 6A. A wedge piece 6Da is integrally provided on the inner side surface of the vertical wall 6D. The wedge piece 6Da has a triangular cross section, and has a tapered surface on the upper side and a horizontal bottom surface on the lower side.

  The wiring board 13 includes a first flexible wiring board 15 (see FIG. 7) and a second flexible wiring board 16 connected thereto.

  The first flexible wiring board 15 has a strip shape and has a plurality of first wirings 15C respectively connecting the two output terminal parts 15B and 15B from the input terminal part 15A connected to the carriage board 9, and the plurality of first wirings 15C. A plurality of termination resistors 17 are respectively connected in the middle of the wiring 15C. The two output terminal portions 15B and 15B are arranged side by side in the feed direction B. The plurality of terminating resistors 17 are arranged so as to form two rows side by side in the feed direction B corresponding to the two output terminal portions 15B and 15B.

  The base material of the first flexible wiring board 15 is arranged such that the center of the input terminal portion 15A in the feed direction B is shifted in the feed direction B with respect to the center of the line connecting the two output terminal portions 15B and 15B. It has a shape (so-called meandering shape). And each 1st wiring 15C is arrange | positioned so that the said meandering shape of the 1st flexible wiring board 15 may be made, and wiring length is made equal, and the dispersion | variation in a differential signal characteristic (for example, transmission time) is carried out. It comes to suppress.

  Openings 15Da and 15Db for positioning the first flexible wiring board 15 with respect to the recording head 4 are formed in the first flexible wiring board 15 between the rows of termination resistors 17. Reference numeral 18 denotes a thermistor.

  On the other hand, the second flexible wiring board 16 is mounted with two drive ICs 14 and 14 (signal applying means) which are strip-shaped chips, one end is connected to the piezoelectric actuator 12, and the other end is two connection terminals. It has the 2nd wiring (not shown) connected to part 16A and 16A. The driving ICs 14 and 14 are connected to the connection terminals 16A and 16A in the middle of the second wiring 16B. The two connection terminal portions 16A and 16A are connected to each other by overlapping the two output terminal portions 15B and 15B of the first flexible wiring board 15 from the upper side.

  The second flexible wiring board 16 is formed in a substantially rectangular shape, a central portion in the longitudinal direction is connected to the upper surface of the piezoelectric actuator 12, and both longitudinal portions are orthogonal to the moving direction A and the feeding direction B. In the orthogonal direction, the recording head 4 is bent in a ring shape so as to extend in opposite directions. That is, both side portions drawn out from the connection portion with the piezoelectric actuator 12 are bent along the outer surface of the pressing member 6 so that the respective end portions face each other on the upper side of the pressing member 6. Two drive ICs 14 and 14 are arranged in parallel with the feed direction B (that is, in the width direction of the second flexible wiring board 16) in the vicinity of the end portions on both side portions.

  The connection terminals 16A and 16A of the second flexible wiring board 16 and the output terminal parts 15B and 15B of the first flexible wiring board 15 are connected to the upper side of the pressing member 6 and the positioning pins 6a and 6a are the first. It is made in a state where it is inserted into the openings 15Da and 15Db of the flexible wiring board 15 and positioned. That is, the second flexible wiring board 16 is positioned in advance with respect to the recording head 4 because the central portion is connected to the piezoelectric actuator 12, pressed by the pressing member 6, and pulled out along the outer surface of the pressing member 6. It will be. As a result, the positioning pins 6a and 6a of the pressing member 6 are inserted into the openings 15Da and 15Db of the first flexible wiring board 15, and the first against the recording head 4 via the pressing member 6 (positioning pins 6a and 6a). By positioning the flexible wiring board 15, both the flexible wiring boards 15 and 16 are positioned with respect to the recording head 4. The reason why the second flexible wiring board 16 can be positioned in advance using the holding member 6 in this way is that the LVDS (low voltage differential signal transmission method) is adopted and the number of nozzles is increased. This is because the second flexible wiring board 16 is enlarged so that fine precision is not required for the welding pitch.

  Further, the positioning pin 6a has a structure in which a tip pin portion for positioning is provided at the tip center portion, and a pedestal portion having a diameter larger than that of the tip pin portion is provided on the lower side. A total of three support portions 6b (approximately the same height as the pedestal portion) are provided on both sides of the two positioning pins 6a and between them. That is, the two positioning pins 6a and the support portion 6b are arranged on a straight line. Thereby, the center part of the part joined to the second flexible wiring board 16 of the first flexible wiring board 15 is supported at a predetermined height from the lower side by the pedestal part and the support part 6b, and is lowered below. It does not bend greatly. Therefore, it is reliably avoided that the terminal resistor 17 contacts the upper surface of the pressing member 6 positioned below the terminal resistor 17.

  A heat sink 7 is provided above the second flexible wiring board 16 so as to sandwich the two drive ICs 14 and 14 together with the recording head 4 in the orthogonal direction. The heat sink 7 has a function of contacting the two drive ICs 14 and 14, dissipating heat generated from the drive ICs 14 and 14, and cooling the two drive ICs 14 and 14. The heat sink 7 is formed by bending a sheet metal made of a metal having high thermal conductivity (for example, aluminum) into a hairpin shape, and an upper plate portion 7B and a lower plate portion 7C are formed from a U-shaped bent portion 7A having a large curvature. It extends in parallel with a slight clearance. In the upper plate portion 7B, a recess 7Ba is formed corresponding to the hanging wall 6D. The heat sink 7 has a rectangular shape in plan view. The heat sink 7 is accommodated in the carriage 3 from the upper side, and is assembled on the wiring board 13 (first flexible wiring board 15) and the pressing member 6 in the carriage 3. At this time, the lower plate portion 7C of the heat sink 7 The lower surface is in contact with the tapered surface of the wedge piece 6Da of the vertical wall 6D. When the heat sink 7 is pressed downward, the hanging wall 6D is elastically deformed outward, and when the lower plate portion 7C moves over the wedge piece 6Da, the hanging wall 6D returns to a vertically extending posture, and the heat sink 7 is engaged. Stop. At this time, the wedge piece 6Da is located in the recess 7Ba.

  Furthermore, the relationship between the pressing member 6 and the wiring board 13 (flexible wiring boards 15 and 16) will be described. The pressing member 6 is bent at both sides of the second flexible wiring board 16 so as to face the upper surface which is the surface opposite to the recording head 4 in the orthogonal direction. On the other hand, the first flexible wiring board 15 is connected to the second flexible wiring board 16 so that the termination resistor 17 faces the upper surface of the pressing member 6 (the bottom surface of the recess 6C). And the positioning pin 6a of the pressing member 6 has a positioning part which positions the 1st flexible wiring board 15 and supports this. That is, the positioning is performed by the tip pin portion of the positioning pin 6a and is supported by the pedestal portion of the positioning pin. A positioning pin 6a protrudes from the upper surface so that the positioning portion is separated from the upper surface of the pressing member 6, and the connection portion of the first and second flexible wiring boards 15 and 16 and the upper surface of the pressing member 6 Two spaces S are formed on both sides of a line connecting the two positioning pins 6a.

  This space S can be used for inserting a heater receiving stage T of a well-known welding facility when the first and second flexible wiring boards 15 and 16 are connected. That is, it is possible to connect the first flexible wiring board 15 to the second flexible wiring board 16 with a well-known welding facility as follows. First, the heater receiving stage T is inserted into each space S before connection. At this time, for example, as shown in FIG. 7, even if the termination resistor 17 arranged in a row in parallel with the output terminal portion 15 is inserted into the heater receiving stage T, the heater receiving stage T is not connected to the termination resistor 17. Do not touch. Then, a conductive material such as solder is installed above the connection terminal portion 16A. When the first flexible wiring board 15 is stacked on the second flexible wiring board 16 from above, the distal end pin portion of the positioning pin 6a of the pressing member 6 is inserted into the positioning openings 15Da and 15Db of the first flexible wiring board 15. Insert. When the tip pin part is inserted into the openings 15Da and 15Db of the first flexible wiring board 15, the output terminal part 15B of the first flexible wiring board 15 becomes the connection terminal part of the second flexible wiring board 16. Positioned relative to 16A. In this positioning state, the first flexible wiring board 15 straddles both side portions of the second flexible wiring board 16, and the output terminal portion 15B is superimposed on the connection terminal portion 16A. Next, a heater (not shown) is pressed from the upper side against the connection portion of both the flexible wiring boards 15 and 16 supported by the heater receiving stage T, and the conductive material is melted by the heat of the heater and then solidified. Thereby, both terminal parts 15B and 16A are connected.

  As shown in FIGS. 4 and 8, the carriage substrate 9 is mounted on the carriage 3 together with the recording head 4 and has a connector 21 that receives a differential signal for driving the recording head 4 and outputs the differential signal toward the recording head 4. . The differential signal is output from a main body substrate 41 (control substrate, see FIG. 4) disposed in the inkjet recording apparatus 1 and input to the connector 21 through the wiring substrate 31. Then, the differential signal output from the carriage substrate 9 is input to the drive IC 14 mounted on the wiring board 13 via the termination resistor 17, and the drive IC 14 outputs a drive signal for driving the piezoelectric actuator 12. The piezoelectric actuator 12 is supplied. A sponge material 22 is disposed around the connector 21.

  In this way, the transmission unit including the carriage substrate 9 and the wiring substrate 3 (first and second flexible wiring substrates 15 and 16) having the wiring (first and second wirings) is used to transmit the differential signal to the main body. The signal is transmitted from the substrate 41 to the driving IC 14 via the connector 21 of the carriage substrate 9 and the wiring of the wiring substrate 13 connected to the connector 21. A termination resistor 17 that suppresses reflection of the differential signal output from the carriage substrate 9 to the drive IC 14 is connected to the wiring of the wiring substrate 13. The wiring board 31, the carriage board 9, and the wiring board 13 are examples of the transmission unit of the present invention.

  Further, the carriage substrate 9 is provided with a media sensor 23 (medium detection sensor) for detecting the recording paper P at a portion upstream of the connector 21 in the feed direction B, and further supplies power to the two drive ICs 14. In order to avoid the occurrence of the unbalance, the electrolytic capacitor 24 is arranged in the moving direction A along with the center of the connector 21 in the feed direction B. As a result, the distance between the media sensor 23 and the electrolytic capacitor 24 is narrowed. Therefore, the wiring board 13 is pulled out from the connector 21 so that it is aligned with the electrolytic capacitor 24 and located downstream of the electrolytic capacitor 24 in the feed direction B when viewed from the orthogonal direction orthogonal to the feed direction B and the movement direction A. ing. As a result, the wiring board 13 is pulled out without being obstructed by the media sensor 23 and the electrolytic capacitor 24 arranged at the upstream side of the connector 21 in the feed direction B. With the carriage 3 attached to the carriage 3, the media sensor 23 is disposed outside the carriage 3, but the media sensor 23 is accommodated in an accommodation portion 3 a formed integrally with the carriage 3. . Reference numeral 26 denotes an encoder sensor.

  An exhaust valve means 25 for discharging the air in the ink flow path in the buffer tank 8 to the outside is provided on the side where the media sensor 23 and the electrolytic capacitor 24 are provided and on the opposite side in the moving direction A. Therefore, the first flexible wiring board 15 is pulled out from the side where the exhaust valve means 25 is not provided. The upper portion of the exhaust valve means 25 is connected to a connection portion 8A of the buffer tank 8 located on the side opposite to the side on which the wiring board 13 extends. Further, since the first flexible wiring board 15 has a meandering shape as described above, it is ensured that the wiring lengths are equal, and the carriage board 9 has a gap between the carriage 3 and the buffer tank 8. It is pulled out to the upper side, bent in the direction of arrow C shown in FIG. At this time, since the electrolytic capacitor 24 (see the broken line in FIG. 7) is drawn out at the bent portion of the first flexible wiring board 15, interference with the electrolytic capacitor 24 is avoided.

  With the configuration described above, a differential signal for driving the recording head 4 is transmitted from the carriage substrate 9 to the drive IC 14, and the wiring 15 C and the wiring 15 C connected to the drive IC 14 are connected to the wiring 15 C and the transmission unit. Since the termination resistor 17 that suppresses reflection of the differential signal output from the carriage substrate 9 to the drive IC 14 is provided, unlike the case where the termination resistors 17 are integrated as a unit, the termination resistor is provided for each wiring. 17 can be selected and used. Further, it is easy to change the resistance value of the termination resistor 17 by replacement or the like, and it is advantageous to suppress the variation in the differential signal characteristics by changing the resistance value. In particular, when the wiring length of the first wiring 15C is different, the resistance value can be finely adjusted by selecting a termination resistor according to the wiring length and changing the resistance value for each wiring.

  In addition, the wiring board 13 is pulled out from the connector 21 so as to be aligned with the electrolytic capacitor 24 and located downstream of the electrolytic capacitor 24 in the feeding direction B when viewed from the orthogonal direction orthogonal to the feeding direction B and the moving direction A. Therefore, interference with the electrolytic capacitor 24 can be avoided when the wiring board 13 is pulled out from the connector 21.

  Further, the transmission amount can be increased by using the two driving ICs 14, and the terminating resistor 27 corresponds to the two output terminal portions 15 </ b> B and 15 </ b> B of the first flexible wiring board 15 in the feeding direction B. Since it arrange | positions so that 2 rows may be located in a line, the special space for arrange | positioning the several termination resistor 27 in a line form is not required.

  Further, the first flexible wiring board 15 has a shape in which the center of the input terminal portion 15A in the feed direction B is shifted from the center of the line connecting the two output terminal portions 15B and 15B in the feed direction B. The first wiring 15C is arranged along the shape of the first flexible wiring board 15 and the wiring lengths are made equal, so that the differential signal characteristics may vary. Can be suppressed. In addition, the first flexible wiring board 15 has a shape in which the center of the input terminal portion 15A in the feed direction B is shifted from the center of the line connecting the two output terminal portions 15B in the feed direction B. Therefore, the degree of freedom in layout is increased, and interference with other components (for example, the electrolytic capacitor 24) arranged around the first flexible wiring board 15 can be avoided.

  Since the openings 15Da and 15Db for positioning the first flexible wiring board 15 with respect to the recording head 4 are formed between the plurality of termination resistors 17, they are mounted on the first flexible wiring board 15. Open holes 15Da and 15Db for positioning the first flexible wiring board 15 can be arranged so as not to affect the plurality of termination resistors 17.

  Furthermore, since the positioning members 6a and 6b to be inserted into the apertures 15Da and 15Db are provided by using the pressing member 6 that presses the second flexible wiring board 16 against the piezoelectric actuator 12, a special pin for positioning is provided. There is no need to provide a member.

  Further, when positioning the first flexible wiring board 15, the positioning pins 6 a (pedestal portions 6 ab) are used between the connecting portions of the first and second flexible wiring boards 15 and 16 and the upper surface of the pressing member 6. Since the space S is formed, it is necessary to insert the heater receiving stage T of a well-known welding facility when connecting the first and second flexible wiring boards 15 and 16 during manufacturing. A space S can be easily secured between the connection portions of the first and second flexible wiring boards 15 and 16 and the upper surface of the pressing member 6 in relation to the positioning portion (connection portion).

  In addition to the above-described embodiment, the present invention can be implemented with appropriate modifications, for example, as follows.

  (i) The termination resistor 17 can be mounted not on the first flexible wiring board 15 but on the second flexible wiring board 16.

  (ii) The carriage substrate 9 does not necessarily have to be disposed almost directly above the recording head 4, and the positional relationship between the first flexible wiring substrate 15 and the carriage substrate 9 is not limited.

  (i) The connector 21 to which the wiring board 13 is connected may be disposed on the lower surface side of the carriage substrate 9, and the electrolytic capacitor 24 may be disposed on the upper surface side of the carriage substrate 9.

  (iii) The droplet discharge device is not limited to an ink jet recording device that discharges ink, but a device that manufactures a color filter of a liquid crystal display device by discharging a liquid other than ink, such as a colored liquid, or a conductive liquid. The present invention can also be applied to a droplet discharge device used for an apparatus for forming electrical wiring.

  (iv) The form of the pressure applying means is not limited to the piezoelectric actuator.

P Recording paper 1 Inkjet recording device (droplet discharge device)
2 Guide rod 3 Carriage 4 Recording head (droplet ejection head)
5 Conveying roller (conveying means)
6 Holding member 6a Positioning pin 7 Heat sink 8 Buffer tank 8A Connection portion 9 Carriage board (control board)
DESCRIPTION OF SYMBOLS 10 Reinforcement frame 10a Opening hole 10b Opening 11 Channel unit 12 Piezoelectric actuator 13 Wiring board 14 Drive IC (signal supply means)
15 1st flexible wiring board 15A Input terminal part 15B Output terminal part 15C 1st wiring 15Da, 15Db Opening 16 2nd flexible wiring board 16A Connection terminal part 17 Termination resistor 21 Connector 23 Media sensor (medium detection sensor)
24 Electrolytic Capacitor 41 Main Board (Control Board)
S Space T Heater receiving stage

Claims (7)

A droplet discharge head having pressure applying means for selectively applying a pressure for discharging droplets from a plurality of nozzles; and a control substrate for outputting a differential signal for driving the droplet discharge head. A droplet discharge device comprising:
A signal supply means connected to the pressure applying means and the control board, and supplied with the differential signal output from the control board and supplying a drive signal for driving the pressure applying means to the pressure applying means. When,
A transmission section that transmits the differential signal from the control board to the signal supply means, and has a wiring connected to the signal supply means;
Transport means for transporting the medium to be ejected in the feed direction;
A carriage mounted with the droplet discharge head and reciprocating in a moving direction perpendicular to the feeding direction,
The transmission unit is
A termination resistor connected to the wiring and suppressing reflection of the differential signal output from the control board to the signal supply means;
Connected to the pressure applying means, the termination resistor is mounted, and a wiring board having the wiring,
A carriage board mounted on the carriage and having a connector for connecting the wiring board,
The carriage substrate is provided with a medium detection sensor for detecting the discharged medium at a portion upstream of the connector in the feed direction,
Furthermore, an electrolytic capacitor is arranged on the carriage substrate in the moving direction along with the center of the connector in the feed direction,
The wiring board is pulled out from the connector so as to be positioned downstream of the electrolytic capacitor and aligned with the electrolytic capacitor when viewed from the orthogonal direction orthogonal to the feeding direction and the moving direction. A droplet discharge apparatus characterized by the above. A droplet discharge head having pressure applying means for selectively applying a pressure for discharging droplets from a plurality of nozzles; and a control substrate for outputting a differential signal for driving the droplet discharge head. A droplet discharge device comprising:
A signal supply means connected to the pressure applying means and the control board, and supplied with the differential signal output from the control board and supplying a drive signal for driving the pressure applying means to the pressure applying means. When,
A transmission section that transmits the differential signal from the control board to the signal supply means, and has a wiring connected to the signal supply means;
Transport means for transporting the medium to be ejected in the feed direction;
A carriage mounted with the droplet discharge head and reciprocating in a moving direction perpendicular to the feeding direction,
The transmission unit is
A termination resistor connected to the wiring and suppressing reflection of the differential signal output from the control board to the signal supply means;
Connected to the pressure applying means, the termination resistor is mounted, and a wiring board having the wiring,
A carriage board mounted on the carriage and having a connector for connecting the wiring board,
The wiring board is
Connecting the two output terminal portions from the input terminal portion connected to the connector, respectively, and having a plurality of wires connected to the termination resistor in the middle thereof,
The two output terminal portions are arranged side by side in the feed direction,
The wiring board, the center of the input terminal portion in the feeding direction, the distance between one of said feeding direction to definitive the two output terminal portion, the distance between the other of the two output terminal portion It has a shape that is shifted so that it is shorter than
The liquid droplet ejection apparatus according to claim 1, wherein the wirings are arranged so as to have the same wiring length by being arranged along the shape of the wiring board . A droplet discharge head having pressure applying means for selectively applying a pressure for discharging droplets from a plurality of nozzles; and a control substrate for outputting a differential signal for driving the droplet discharge head. A droplet discharge device comprising:
A signal supply means connected to the pressure applying means and the control board, and supplied with the differential signal output from the control board and supplying a drive signal for driving the pressure applying means to the pressure applying means. When,
A transmission section that transmits the differential signal from the control board to the signal supply means, and has a wiring connected to the signal supply means,
The transmission unit is
A termination resistor connected to the wiring and suppressing reflection of the differential signal output from the control board to the signal supply means;
Connected to the pressure applying means, the termination resistor is mounted, and a wiring board having the wiring, and
The wiring board is
A first wiring board having an input terminal part and two output terminal parts electrically connected to the control board ;
A second wiring board having two connection terminal portions respectively connected to the two output terminal portions, wherein the second wiring substrate is connected to the pressure applying means and in a first direction orthogonal to a nozzle surface on which the nozzle is provided . A second wiring board that is bent in a ring shape so as to be aligned with the droplet discharge head, and the two connection terminal portions are provided so as to be aligned in a second direction parallel to the nozzle surface ,
The termination resistor, droplets and characterized in that it is arranged to form two rows aligned in a third direction corresponding to said two output terminals section perpendicular to the first direction and the second direction Discharge device. The wiring board is
A first wiring board having the input terminal portion and two output terminal portions;
Two signal supply means are mounted, connected to the two output terminal portions and the pressure applying means, and bent in a ring shape so as to be aligned with the droplet discharge head in a direction orthogonal to the feeding direction and the moving direction. A second wiring board provided with the two signal supply means parallel to the feeding direction,
A heat sink for cooling the two signal supply means is further provided, positioned so as to sandwich the two signal supply means together with the droplet discharge head in the orthogonal direction, and in contact with the two signal supply means Is,
The droplet discharge device according to claim 2, wherein the termination resistors are arranged so as to form two rows side by side in the feeding direction corresponding to the two output terminal portions. A plurality of termination resistors are mounted on the first wiring board, and an opening for positioning the first wiring board with respect to the droplet discharge head is provided between the plurality of termination resistors. The droplet discharge device according to claim 3 or 4 , wherein the droplet discharge device is formed. A pressing member that is disposed so as to sandwich the second wiring board together with the pressure applying means in the orthogonal direction, and further includes a pressing member that presses the second wiring board against the pressure applying means;
The droplet discharge device according to claim 4 or 5 , wherein the pressing member is provided with a positioning pin inserted into the opening.
The pressing member has a surface opposite to the droplet discharge head in the orthogonal direction,
The second wiring board is bent so as to face the surface of the pressing member,
The first wiring board is connected to the second wiring board so that the termination resistor faces the surface of the pressing member;
The positioning pin has a positioning portion that supports the first wiring board and the second wiring board, and the positioning pin is located on the surface so that the positioning portion is separated from the surface of the pressing member. The liquid droplet ejection apparatus according to claim 6, wherein the liquid droplet ejection apparatus protrudes from the first wiring board and forms a space between the first and second wiring boards and the surface of the pressing member.

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