JP5368977B2 - Electronic component mounting apparatus and mounting method - Google Patents

Description

  The present invention relates to an electronic component mounting apparatus and a mounting method for crimping an electronic component to a substrate via a thermosetting anisotropic conductive member.

  For example, a TCP (Tape Carrier Package), which is an electronic component, is pressure-bonded to a liquid crystal cell as a substrate via an anisotropic conductive member made of a thermosetting resin as an adhesive material. The liquid crystal cell is configured by adhering two glass plates at a predetermined interval via a sealing agent, enclosing liquid crystal between these glass plates, and attaching a polarizing plate to the outer surface of each glass plate. The In the liquid crystal cell having the above structure, the tape-like anisotropic conductive member is attached to the upper surface of the edge, and the TCP is temporarily pressure-bonded on the anisotropic conductive member, and then the liquid crystal cell is finally pressure-bonded. Yes.

  A mounting apparatus is used when TCP is temporarily pressure-bonded or permanently pressure-bonded to the substrate. As is well known, the mounting apparatus has an apparatus main body, a backup member is provided on the apparatus main body, and a crimping tool driven in the vertical direction is provided above the backup member.

  If TCP is stuck on the upper surface of one side of the substrate, the lower surface of one side of the substrate is placed on the upper end surface of the backup member. Next, the crimping tool is lowered to pressurize the TCP. As a result, the TCP is temporarily or permanently bonded to the substrate.

By the way, when TCP is finally pressure-bonded to the substrate, the TCP is pressed by the pressure-bonding tool heated to a high temperature. When the TCP is pressed by the crimping tool , the anisotropic conductive member is heated and melted, and a part of the anisotropic conductive member may protrude from the TCP and adhere to the crimping tool .

When the anisotropic conductive member to the crimping tool is cured adheres, because the pressing surface of the bonding tool is uneven, or cause a pressure failure becomes impossible uniformly pressurized to TCP by pressure bonding tool, compression bonding tool The anisotropic conductive member adhering to the surface may transfer to the TCP and cause contamination.

Thus, in the case where the crimping TCP, a sheet having a heat resistance formed by silicone resin or a fluororesin between the TCP and the crimping tool is interposed, when pressurizing the TCP in bonding tool, heated by pressure bonding tool It has been practiced to prevent the molten anisotropic conductive member from adhering to the crimping tool .

  As a means for interposing the sheet between the TCP and the crimping head at the time of crimping, a cassette is detachably attached to the main body of the mounting apparatus, and the TCP is pressurized by the crimping head through the sheet provided on the cassette. It is performed to heat and mount on a substrate. Such a technique is disclosed in Patent Document 1.

  The cassette of the prior art shown in Patent Document 1 is provided with a feeding body in which a sheet is wound around one end between a pair of side plates that are connected to each other in parallel and spaced apart from each other. Is provided with a winding body for winding the sheet fed from the feeding body.

The winding body is rotationally driven by a drive motor, and the feeding body is rotatably provided between the pair of side plates. Then, by operating the drive motor to rotationally drive the winding body, the winding body is rotated according to the rotation to give tension to the sheet wound around the feeding body, The sheet was pulled out while rotating the feeding body.
JP 2005-340436 A

  As disclosed in Patent Document 1, according to the configuration in which only the winding body is rotationally driven by the drive motor and the sheet is pulled out from the feeding body, the driving motor is operated to wind the sheet from the feeding body for a predetermined length. When the take-up body is rotated, the feeding body may be rotated at a larger angle than the length of the sheet taken up by the take-up body due to the tension from the sheet taken up by the take-up body. That is, the length of the sheet fed from the feeding body may be longer than the length wound by the winding body.

In such a case, since intends want in sheet loosened between the winding body and the feeding member, when crimping the TCP through the sheet to the substrate by pressure bonding tool, it can not be uniformly and surely pressure the TCP to the substrate In some cases, it causes a mounting failure.

  In order to prevent the sheet from being pulled out too much from the feeding body when the sheet is wound by the winding body, a brake mechanism is provided in the feeding body, and a predetermined rotational resistance is given to the feeding body by the brake mechanism, The rotation resistance prevents the sheet from being pulled out too much from the feeding body.

  If rotational resistance is applied to the feeding body from which the sheet is drawn, it is possible to prevent the sheet from being pulled out and loosened. However, when a rotational resistance is given to the feeding body, the stretchable synthetic resin sheet is stretched due to the rotational resistance of the feeding body, so that the slackness is caused by the stretching, and the slackness causes a mounting failure. is there.

  It is an object of the present invention to provide an electronic component mounting apparatus and a mounting method in which variations and elongations of the length of a sheet drawn from a feeding body do not occur.

In order to solve the above problems, the present invention is an electronic component mounting apparatus that pressurizes an electronic component provided on a substrate through a sheet and press-bonds the electronic component to the substrate,
The device body;
A backup member that is provided in the apparatus main body and supports a lower surface of a portion to which the electronic component of the substrate is pressure-bonded;
A crimping tool that pressurizes and press-bonds the electronic component to an upper surface of a portion of the substrate supported by the backup member, which is provided above the backup member so as to be vertically driven;
It has a feeding body that is mounted and rotated by a feeding motor to feed out the sheet, and a winding body that is driven to rotate by a winding motor and winds up the sheet fed from the feeding body. A portion of the sheet positioned between the feeding body and the winding body is interposed between the electronic component and the crimping tool when the electronic component is crimped to the substrate by the crimping tool. Cassette,
Control means for operating the feeding motor to feed the sheet from the feeding body by a predetermined amount and then operating the take-up motor to wind up the sheet fed from the feeding body to the winding body. When
Detecting means for detecting a feeding length of the sheet fed from the feeding body;
Comprising
It is an object of the present invention to provide an electronic component mounting apparatus in which the control means drives the feeding motor based on a detection signal from the detection means to feed the sheet from the feeding body for a predetermined length .

Further, according to the present invention, when an electronic component provided on a substrate is pressed with a crimping tool and is crimped to the substrate, the reel is fed from a cassette feeding body between the electronic component and the crimping tool. An electronic component mounting method that interposes a sheet wound around
Crimping the electronic component to the substrate via the sheet with the crimping tool;
After crimping the electronic component to the substrate, driving the feeding body and feeding the sheet from the feeding body for a predetermined length; and
And a step of driving the winding body after the sheet is unwound from the unwinding body and winding the sheet unwound from the unwinding body. It is in.

FIG. 1 is a schematic configuration diagram showing a mounting apparatus according to a first embodiment of the present invention. FIG. 2 is a plan view showing the cassette partially broken. FIG. 3 is a plan view showing a structure for detachably supporting the feeding shaft and the winding shaft on the cassette. FIG. 4 is a block diagram for controlling the rotational drive of the feeding shaft and the winding shaft. FIG. 5 is an explanatory view of a means for detecting the rotation of the feeding shaft, showing the second embodiment of the present invention.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 to 4 show a first embodiment of the present invention, and FIG. 1 is a schematic configuration diagram of a mounting apparatus. This mounting apparatus includes an apparatus main body 1. The apparatus main body 1 is provided with an XY table 2 that is driven in the X direction and the Y direction, which are horizontal directions. A substrate 3 such as a liquid crystal cell is supplied and mounted on the XY table 2 with one side edge projecting sideways from the upper surface of the XY table 2 and is held by means such as vacuum suction. ing. A TCP 5 as an electronic component is temporarily pressure-bonded to one side portion of the substrate 3 via an anisotropic conductive member 4.

  The apparatus main body 1 is provided with a backup member 6 that receives the lower surface of one side edge portion of the substrate 3 held by the XY table 2 by the upper end surface. The TCP 5 is temporarily pressure-bonded to one side portion of the substrate 3 whose lower surface is supported on the upper end surface of the backup member 6, and the TCP 5 is pressure-heated and pressure-bonded by a pressure-bonding tool 7.

  The crimping tool 7 is provided on the lower surface of the pressure head 8. The pressure head 8 is provided so as to be slidable in the Z direction, that is, in the vertical direction by the linear guide 9, and is driven in the Z direction by the Z drive source 10.

  The crimping tool 7 is provided with a heater 7a that pressurizes and heats the anisotropic conductive member 4 together with the TCP 5 when the TCP 5 is finally crimped. As a result, the anisotropic conductive member 4 is melt-cured and the TCP 5 is fixed to the substrate 3, that is, main-bonded.

  A pair of rail members 11 (only one is shown) are provided horizontally along the front-rear direction of the apparatus main body 1 at positions slightly above the backup member 6 at both ends in the width direction of the apparatus main body 1. ing. A cassette 12 can be attached to and detached from the apparatus main body 1 along the rail member 11.

  When the cassette 12 is mounted on the apparatus main body 1, a stopper (not shown) provided on the cassette 12 contacts a contact portion (not shown) provided on the apparatus main body 1 at a predetermined position. Thereby, the cassette 12 is positioned.

  As shown in FIGS. 1 and 2, the cassette 12 has a pair of rectangular side plates 14 connected by a plurality of connecting shafts 13 at a predetermined interval. The connecting shaft 13 connects at least the four corners of the side plate 14.

  As shown in FIG. 2, two pairs of support shafts 17 that are paired with each other are rotatably provided at one end and the other end in the longitudinal direction of the pair of side plates 14. A cylindrical receiver 19 is provided at one end of each of the support shafts 17 that protrudes toward the inner surface of the pair of side plates 14 that face each other. As shown in FIG. 3, each receiver 19 is formed with an engaging groove 18 penetrating in the radial direction. A driven gear 21 is fitted to an end portion of the one support shaft 17 of each set that protrudes to the outer surface side of the side plate 14.

  As a feeding body in which a sheet 19 made of a synthetic resin having heat resistance such as silicon resin or fluorine resin is wound on a holder 19 provided on a pair of support shafts 17 positioned at one end of the side plate 14. The feed shaft 23 is detachably supported.

  The receiver 19 provided on the pair of support shafts 17 located at the other end of the side plate 14 is in a drum shape for winding the sheet 22 wound around the feeding shaft 23 via a plurality of relay rollers 24. A take-up shaft 26 projecting from both end faces of the take-up body 25 is detachably supported.

  When the feeding shaft 23 and the take-up shaft 26 are supported by the support 19, they rotate integrally with the support shaft 17 provided with the support 19. That is, as shown in FIG. 3, a receiving hole 27 is formed at one end of the feeding shaft 23 and the take-up shaft 26 so as to open to the end surfaces of the respective shafts. A relay shaft 28 is urged in the protruding direction by a spring 29 and accommodated in each accommodation hole 27.

  A pin 31 protrudes from the relay shaft 28, and the pin 31 engages with a long hole 32 formed in communication with the feeding hole 23 of the feeding shaft 23 and the winding shaft 26. Accordingly, the relay shaft 28 is elastically movable with respect to the axial direction of the feeding shaft 23 and the take-up shaft 26 and cannot be pulled out.

  The delivery shaft 23 and the take-up shaft 26 are engaged at one end with a receiver 19 provided at one of the support shafts 17, and a relay shaft 28 provided at the other end is attached to a spring 29. It is supported by the pair of support shafts 17 by being engaged with a receiving tool 19 provided on the other support shaft 17 while being displaced in the direction of immersing in the accommodation hole 27 against the force. That is, the feeding shaft 23 and the take-up shaft 26 can be attached to and detached from the cassette 12.

  As shown in FIG. 2, a pin 33 that engages with the engagement groove 18 of the receiving tool 19 is provided at the other end of the feeding shaft 23 and the winding shaft 26. The pins 31 and 33 are respectively engaged with the engaging grooves 18 of the receiving device 19, so that the feeding shaft 23 and the winding shaft 26 rotate integrally with the support shaft 17.

  When the cassette 12 having the above configuration is mounted on the apparatus main body 1, the driven gear 21 provided on one support shaft 17 of each set is driven by a drive gear 35 (shown in FIG. 2) positioned below the driven gear 21 in the radial direction. It is designed to mesh with.

  A drive gear 35 provided on the support shaft 17 that supports the feed shaft 23 is fitted to a rotation shaft 36 a of a feed motor 36. A drive gear 35 provided on the support shaft 17 that supports the winding shaft 26 is fitted to a rotating shaft 37 a of a winding motor 37. As the feeding motor 36 and the take-up motor 37, a motor capable of switching the rotation torque, for example, a stepping motor, a servo motor or a torque motor is used.

  The feeding motor 36 and the take-up motor 37 are controlled by a control device 39 shown in FIG. That is, the control device 39 includes a first drive unit 41 and a first torque setting unit 42 that are sequentially connected to the feeding motor 36 and a second drive unit 43 and a second drive unit 43 that are sequentially connected to the take-up motor 37. 2 torque setting units 44.

  As shown in FIG. 2, a rotating body 46 elastically biased toward the radial center of the feeding shaft 23 is in contact with the outer peripheral surface of the sheet 22 wound around the feeding shaft 23. When the feed shaft 23 is rotationally driven by the feed motor 36, the rotating body 46 rotates in conjunction with the rotation.

  Since the rotating body 46 is elastically biased and is in contact with the outer peripheral surface of the sheet 22, even if the outer diameter of the sheet 22 wound around the feeding shaft 23 is reduced, the rotation of the sheet 22 is reduced. It comes to contact with an outer peripheral surface reliably.

  The rotation speed of the rotating body 46, that is, the peripheral speed of the outer peripheral surface of the sheet 22 wound around the feeding shaft 23 is detected by the encoder 47. A detection signal of the encoder 47 is output to a drive control unit 48 provided in the control device 39.

  The drive control unit 48 controls the driving of the motors 36 and 37 via the first and second drive units 41 and 43 based on the detection signal of the encoder 47. In other words, the drive control unit 48 outputs a feed signal to the first drive unit 41 and outputs the take-up signal to the second drive unit 43 with a predetermined time delay through the delay circuit unit 49. .

When a feeding signal is output to the first drive unit 41, the feeding motor 36 is operated accordingly, and the sheet 22 wound around the feeding shaft 23 is fed out. The length of the sheet 22 fed out from the feed shaft 23 is set in advance by the drive control unit 48, and the detection signal of the encoder 47 is fed back to the drive control unit 48, whereby the drive control unit 48. It is controlled so as to become the set value set in.
The length of the sheet 22 fed out from the feed shaft 23 is usually about 5 to 10 mm.

  Since the winding signal output from the drive control unit 48 to the second driving unit 43 is output by the delay circuit unit 49 with a predetermined time delay from the feeding signal, the winding shaft 26 is fed from the feeding shaft 23 to the sheet. Winding is started after 22 is unwound. As a result, when the sheet 22 is taken up by the take-up shaft 26, a tension more than necessary is not applied to the sheet 22.

  Since the winding of the sheet 22 by the winding shaft 26 is performed with a delay from the feeding of the sheet 22 from the feeding shaft 23, the winding shaft after the sheet 22 is fed from the feeding shaft 23 by a predetermined length. 26, the sheet 22 is wound up.

  The rotational torque transmitted from the feeding motor 36 to the feeding shaft 23 is set by the first torque setting unit 42, and the rotational torque transmitted from the winding motor 37 to the winding shaft 26 is the second torque. It is set by the torque setting unit 44.

  The rotational torque when the take-up shaft 26 takes up the sheet 22 is set to be smaller than the torque by the feed motor 36 that holds the feed shaft 23 by the feed motor 36 that has stopped driving.

  Accordingly, even if tension is applied to the sheet 22 by the winding shaft 26 winding the sheet 22, the winding shaft 26 slips against the rotation of the winding motor 37 when the tension reaches a predetermined value. Thus, the winding is completed without applying an unnecessary tension to the sheet 22.

  On the other hand, when the take-up shaft 26 winds up the sheet 22 by an amount corresponding to the length fed from the feed shaft 23, a slight tension is applied to the sheet 22 by the take-up. When tension in the feeding direction is applied to the sheet 22, the feeding shaft 23 is moved in the feeding direction by mechanical rattling between the feeding shaft 23 and the support 19 that supports both ends of the feeding shaft 23 due to the tension. And the sheet 22 is fed out from the feeding shaft 23, which may cause slack in the sheet 22.

  When the sheet 22 is fed after the winding by the winding shaft 26 is completed, the feeding length is detected by the encoder 47 through the rotating body 46. A detection signal from the encoder 47 is output to the first drive unit 41 via the drive control unit 48.

  Upon receipt of the detection signal, the first drive unit 41 operates the feeding motor 36 and rotates the feeding shaft 23 according to the length of the sheet 22 fed after the winding by the winding shaft 26 to move the sheet 22. Rewind. This prevents the sheet 22 from sagging.

  In addition, since the sheet 22 that has been fed out after winding is rewound onto the feeding shaft 23, the unused sheet 22 is not excessively fed out to the winding shaft 26, so that the sheet 22 is more than necessary. It is possible to prevent occurrence of waste due to feeding.

  According to the mounting apparatus having the above configuration, the feeding shaft 23 for feeding the sheet 22 is rotationally driven by the feeding motor 36, and the winding shaft 26 for winding the sheet 22 is rotationally driven by the winding motor 37.

  A rotating body 46 is brought into contact with the outer peripheral surface of the sheet 22 wound around the feeding shaft 23, the rotation of the rotating body 46 is detected by the encoder 47, and the detection signal is output to the drive control unit 48 of the control device 39. I tried to do it.

  The drive control unit 48 drives the feeding motor 36 based on the detection signal from the encoder 47, and controls the rotational drive of the feeding motor 36 so that the sheet 22 is fed from the feeding shaft 23 by a preset length. Then, after the sheet 22 is fed from the feeding shaft 23, the winding motor 37 is operated to wind the sheet 22 around the winding shaft 26.

  Therefore, not only can the sheet 22 be unrolled from the unwinding shaft 23 by a preset length, but the sheet 22 is unwound by the take-up shaft 26 after being unwound. The sheet 22 can be wound on the winding shaft 26.

  When the sheet 22 is taken up by the take-up shaft 26 after the sheet 22 is fed from the feed shaft 23, the torque for holding the feed shaft 23 that has stopped rotating by the feed motor 36 is taken up by the take-up motor 37. 26 is set to be larger than the rotational torque when the sheet 22 is wound around.

  Therefore, after the sheet 22 fed from the feeding shaft 23 is taken up by the take-up shaft 26, the take-up shaft 26 is further rotationally driven to take up the sheet 22, and the tension applied to the sheet 22 is increased to increase the predetermined value. When the value is reached, the winding shaft 26 slips with respect to the rotation of the winding motor 37.

  Therefore, no further tension is applied to the sheet 22, so that the sheet 22 is not stretched and does not become slack. That is, the sheet 22 fed from the feed shaft 23 is reliably wound by the take-up shaft 26 only for the amount fed from the feed shaft 23 without being slackened due to elongation.

  When the winding shaft 26 winds up the sheet 22, a slight tension is applied to the sheet 22 at the time of winding, and the tension may cause the sheet 22 to be unwound from the unwinding shaft 23 and cause slack. . The cause of the sheet 22 being fed out from the feeding shaft 23 may be a mechanical rattling between the feeding shaft 23 and the support 19.

  However, when the sheet 22 is taken up by the take-up shaft 26 by the take-up shaft 26, this is detected by the encoder 47 through the rotating body 46, and based on the detection signal, the sheet 22 The portion fed from the feed shaft 23 is rewound onto the feed shaft 23.

Therefore, when the sheet 22 is rewound by the feeding shaft 23 , even when the sheet 22 is slackened when the sheet 22 is wound by the take-up shaft 26, the slack can be reliably removed. In addition, since the loose sheet 22 is rewound onto the feeding shaft 23 , there is no waste of extra feeding of the sheet 22.

  FIG. 5 shows a second embodiment of the present invention. In this embodiment, a rotating body 46 is pressed against the outer peripheral surface of the sheet 22 wound around the feeding shaft 23, and the rotating body 46 is rotationally driven by the feeding motor 36. As the feeding motor 36, a motor capable of controlling the feed amount alone such as a stepping motor or a servo motor is used.

  The rotating body 46 and the feeding motor 36 are integrally held so as to be elastically pressed against the outer peripheral surface of the sheet 22 around which the rotating body 46 is wound. Accordingly, when the feeding motor 36 is operated to rotate the rotating body 46, the feeding shaft 23 is rotated by the rotating body 46 via the sheet 22, so that the sheet 22 can be fed from the feeding shaft 23. .

  Since the rotation angle of the rotating body 46 can be detected by the feeding motor 36, if the detection signal is output to the drive control unit 48 via the first driving unit 41, the feeding is performed as in the first embodiment. The drive of the motor 36 and the winding motor 37 can be controlled. That is, if the sheet 22 is fed from the feed shaft 23, only the amount fed by the take-up shaft 26 can be taken up.

  According to the present invention, the feeding body is rotationally driven by the feeding motor, the winding body is rotationally driven by the winding motor, the drive of the feeding motor and the winding motor is controlled, and a predetermined amount of sheets are fed from the feeding body. After letting out, it was made to wind up the part which was let out by the said winding body.

  For this reason, since it is possible to prevent the sheet from being slackened or stretched, it is possible to eliminate mounting defects of electronic components due to sheet slacking or stretching.

Claims (6)

An electronic component mounting apparatus that pressurizes an electronic component provided on a substrate through a sheet and press-bonds the electronic component to the substrate,
The device body;
A backup member that is provided in the apparatus main body and supports a lower surface of a portion to which the electronic component of the substrate is pressure-bonded;
A crimping tool that pressurizes and press-bonds the electronic component to an upper surface of a portion of the substrate supported by the backup member, which is provided above the backup member so as to be vertically driven;
It has a feeding body that is mounted and rotated by a feeding motor to feed out the sheet, and a winding body that is driven to rotate by a winding motor and winds up the sheet fed from the feeding body. A portion of the sheet positioned between the feeding body and the winding body is interposed between the electronic component and the crimping tool when the electronic component is crimped to the substrate by the crimping tool. Cassette,
Control means for operating the feeding motor to feed the sheet from the feeding body by a predetermined amount and then operating the take-up motor to wind up the sheet fed from the feeding body to the winding body. When
Detecting means for detecting a feeding length of the sheet fed from the feeding body;
Comprising
The electronic component mounting apparatus , wherein the control means drives the feeding motor based on a detection signal from the detecting means to feed the sheet from the feeding body for a predetermined length . After the detecting means actuates the take-up motor to cause the take-up body to take up the amount of the sheet fed from the feed body, it detects that the sheet is further fed from the feed body. when electrons claim 1, wherein the said control means based on a detection for causing rewinding the amount paid out by operating the feed motor from the feed of the sheet in the feeding member Component mounting equipment. The feeding motor and the take-up motor have a structure capable of switching control of rotational torque,
The control means sets a rotational torque at which the take-up motor drives the take-up body to take up the sheet to be smaller than a rotational torque force at which the feed motor holds the feed body in a stopped state. The electronic component mounting apparatus according to claim 1 . When the electronic component provided on the substrate is pressed with the crimping tool and crimped to the substrate, a sheet that is fed from the cassette feeding body and wound around the winding body is placed between the electronic component and the crimping tool. A method for mounting an intervening electronic component,
Crimping the electronic component to the substrate via the sheet with the crimping tool;
After crimping the electronic component to the substrate, driving the feeding body and feeding the sheet from the feeding body for a predetermined length; and
A method for mounting an electronic component, comprising: a step of driving the winding body after the sheet is unwound from the unwinding body and winding the sheet unwound from the unwinding body. 5. The electronic component according to claim 4 , further comprising a step of detecting a length of the sheet fed from the feeding body, and controlling the length of the sheet fed from the feeding body based on the detection. How to implement It has the process which sets the rotational torque when the said winding body winds up the sheet | seat fed out from the said delivery body smaller than the rotational torque when the said delivery body is hold | maintained in a stop state, It is characterized by the above-mentioned. The electronic component mounting method according to claim 5 .

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