Crimping device

Abstract

To provide a crimping device that suppresses the generation of defective products due to overshoot during crimping. [Solution] The crimping device 40 of the embodiment has a crimping section 50 that heats and crimps a first workpiece 1 and a second workpiece 2 via an anisotropic conductive film (ACF3). The crimping section 50 has a first operating rod 531a arranged in series in the crimping direction with a pressurizing member 51, and includes a first pressurizing source 531 which is an air cylinder that drives the first operating rod, a second pressurizing source 532 which drives a second operating rod 532a arranged in series in the crimping direction with the first pressurizing source, and includes an air cylinder that has a larger surface area for determining the pressure than the first pressurizing source, and includes a drive mechanism 54 that drives the pressurizing member, the first pressurizing source and the second pressurizing source in the crimping direction so that the pressurizing member pressurizes the second workpiece with a first pressure set on the first pressurizing source, and then pressurizes the second workpiece with a second pressure set on the second pressurizing source.

Description

Technical Field

[0001] The present invention relates to a crimping device.

Background Art

[0002] Display devices such as liquid crystal displays and organic EL displays are manufactured through steps of forming circuits and signal lines on a glass plate, forming a display panel as a substrate that constitutes a display area by bonding a pair of glass plates, and attaching a driver IC for driving or the like outside the display area in the display panel.

[0003] As a method for mounting a driver IC, a method using a flexible film-shaped electronic component on which a driver IC such as a COF (chip on film) is mounted has been conventionally used. This is a method of crimping and connecting the terminals of an electronic component to electrodes formed to be exposed in a horizontal direction parallel to the display surface from around the display area of the panel (see Patent Document 1).

[0004] Hereinafter, such a substrate and a crimping target such as an electronic component are referred to as a work. Also, a conductive portion that should be electrically connected to each other, such as an electrode or a terminal of a work, is referred to as a lead.

[0005] For connecting works to each other, an anisotropic conductive film (ACF: Anisotropic Conductive Film) that ensures conductivity between the leads of each work is used by heat crimping. The anisotropic conductive film is a sheet-like member in which a large number of small conductive particles are contained in a resin serving as a base material. As the resin of the base material, a thermosetting resin is used.

[0006] When an anisotropic conductive film is placed between the leads of a pair of workpieces and heated and pressurized, the conductive particles in the leads, which protrude above the surface of the workpieces, are crushed, causing the leads to make an electrical connection. The other parts remain uncrushed and maintain their thickness, so no conductivity occurs, ensuring insulation. The thermosetting resin base hardens upon heating, resulting in a mechanical connection between the workpieces. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2003-224165 [Overview of the project] [Problems that the invention aims to solve]

[0008] As described above, in order to ensure conductivity between leads by heat-pressing a pair of workpieces via an anisotropic conductive film, it is necessary to crush the conductive particles to the required extent. For this reason, the pressing device used to heat-press the workpieces needs to apply the load necessary to ensure conductivity by the conductive particles.

[0009] Such crimping devices apply a load to the workpiece using, for example, an air cylinder. As mentioned above, a certain level of pressure is required from the air cylinder in order to ensure conductivity with conductive particles. However, the thermosetting resin melts the moment the heat-pressing component comes into contact with the workpiece. If a large load is applied at this point (overshoot), the workpiece will slip and shift, leading to the production of defective products.

[0010] This invention was proposed to solve the above-mentioned problems, and aims to provide a crimping device that can suppress the occurrence of defective products due to overshoot during crimping. [Means for solving the problem]

[0011] To achieve the above objective, the crimping device of the present invention has a crimping section for heating and crimping a pair of workpieces via an anisotropic conductive member made of a thermosetting resin as a base material, the crimping section has a pressurizing member for pressurizing the workpieces, a first pressurizing source which is an air cylinder that drives the first operating rod having a first operating rod arranged in series with the pressurizing member in the crimping direction, a second pressurizing source which is an air cylinder that drives a second operating rod arranged in series with the first pressurizing source in the crimping direction and has a larger surface area for determining the pressure than the first pressurizing source, and a drive mechanism that drives the pressurizing member, the first pressurizing source and the second pressurizing source in the crimping direction so that the pressurizing member pressurizes the workpieces with a first pressure set on the first pressurizing source, and then pressurizes the workpieces with a second pressure set on the second pressurizing source. [Effects of the Invention]

[0012] The crimping device of the present invention can suppress the generation of defective products due to overshoot during crimping. [Brief explanation of the drawing]

[0013] [Figure 1] This is a perspective view showing a workpiece to be crimped according to the embodiment. [Figure 2] This is a plan view showing the leads of the workpiece to be crimped according to the embodiment. [Figure 3] This is a cross-sectional view showing the crimped portion of the workpiece and ACF to be crimped according to the embodiment. [Figure 4] This graph shows the overshoot of the load applied to the workpiece. [Figure 5] This is a partial cross-sectional side view showing the basic configuration of the crimping device according to the embodiment. [Figure 6] Figure 5 is a front view showing multiple sets of the first pressure source, second pressure source, and pressure member in the crimping section arranged in a row. [Figure 7] This is a schematic side view showing the heat-sealed portion in the embodiment. [Figure 8]It is a perspective view showing the appearance of a diaphragm type cylinder and a flat type cylinder. [Figure 9] It is a block diagram showing a control device in an embodiment. [Figure 10] It is a side view showing the heat crimping procedure of a crimping device in an embodiment. [Figure 11] It is a flowchart showing the heat crimping procedure of an embodiment. [Embodiments for Carrying Out the Invention]

[0014] Embodiments of the present invention (hereinafter referred to as "the present embodiment") will be specifically described with reference to the drawings. Note that the drawings include parts where sizes, movement amounts, etc. are exaggerated for easy understanding.

[0015] [Crimping Target] Referring to FIGS. 1 and 2, the first work 1, the second work 2, and the ACF 3 that are crimping targets according to the present embodiment will be described. The first work 1 is a display panel having a display area such as a liquid crystal display or an organic EL display. Depending on its size, as shown in FIG. 1(A), there are cases where a plurality of second works 2 are crimped, and as shown in FIG. 1(B), there are cases where a single second work 2 is crimped. In this embodiment, an example where a plurality of second works 2 are crimped will be described.

[0016] As shown in FIG. 2, leads 11, which are conductive parts, are provided on the sides of the first work 1. Each lead 11 is connected to a circuit in the display area via a signal line. A plurality of leads 11 are arranged side by side at a predetermined interval (pitch p). The plurality of leads 11, for example, have a pitch p (distance between center lines) of 40 μm or less at most.

[0017] As shown in Fig. 1(A), the second workpiece 2 is an electronic component joined to the first workpiece 1 via the ACF 3. As the electronic component, a COF (chip on film) is used. The COF is, for example, a member in which a driver IC is mounted and printed wiring is formed on a flexible sheet using a flexible resin.

[0018] As shown in Fig. 2, on one side of the second workpiece 2, a lead 21 which is a conductive part is provided. The lead 21 is a part for electrically connecting to the lead 11 of the first workpiece 1. Each lead 21 is connected to the driver IC via a signal line. A plurality of leads 21 are arranged side by side at a predetermined interval. The leads 11 of the first workpiece 1 and the leads 21 of the second workpiece 2 have a determined corresponding relationship to be connected to each other, and it is necessary to crimp them so that the positions of the corresponding leads 11 and 21 match. For this reason, the intervals of the leads 11 and 21 also match. This match only needs to be such that the conductivity between the corresponding leads 11 and 21 can be ensured and the insulation from other adjacent leads 11 and 21 can be ensured.

[0019] The ACF 3 is an anisotropic conductive member, which is a film formed by dispersing conductive particles 32 in a base material 31 (see Fig. 3(A)). As the base material 31, a thermosetting resin that cures by heating is used.

[0020] When the ACF 3 is sandwiched between the second workpiece 2 and the first workpiece 1 and pressurized while being heated, the conductive particles 32 located between the lead 21 and the lead 11 are sandwiched and crushed by the leads 11 and 21, thereby realizing conductivity in the thickness direction and insulation in the plane direction between the lead 21 and the lead 11 (see Fig. 3(B)). Also, the thermosetting resin of the base material 31 cures by heating, and the second workpiece 2 is adhered to the first workpiece 1. That is, by thermocompression bonding, electrical connection between the lead 11 and the lead 21 and mechanical connection between the first workpiece 1 and the second workpiece 2 can be realized.

[0021] [Overshoot] For example, consider the case where a cylinder in which a piston slides inside due to fluid pressure, such as a packing-type air cylinder, is used as the pressurizing source. A predetermined pressure is set in the packing-type air cylinder to apply the load necessary to ensure conductivity by ACF3. When the second workpiece 2 and the first workpiece 1 are heated and pressed together by the pressurizing member biased by such an air cylinder, a large load is generated at the moment the pressurizing member starts to pressurize the second workpiece 2, as shown in the area enclosed by the dotted circle in Figure 4, and thereafter becomes a load due to the predetermined pressure.

[0022] As described above, the large load that temporarily occurs when the pressurizing member pressurizes the workpiece is called overshoot. Overshoot occurs when the pressure of the air cylinder is set to a predetermined pressure necessary to apply the load required to ensure conductivity by ACF3, but momentarily exceeds the load required to ensure conductivity. For example, as shown in Figure 4, there are cases where a load exceeding 20N more than the load required to ensure conductivity is applied. Thus, the start of pressurizing the workpiece by the pressurizing member results in a peak value where the load is at its maximum. When the pressurizing member starts heating and pressing, the thermosetting resin melts, so if an overshoot occurs at this point and a large load is applied, the second workpiece 2 will slip and shift relative to the first workpiece 1, leading to the production of defective products.

[0023] Overshoot is thought to occur for the following reason: When not in operation, the piston inside the air cylinder is tightly sealed against the inside of the air cylinder to ensure airtightness. Consequently, the starting resistance when the piston starts moving is much greater than the dynamic friction resistance after it starts moving. Therefore, at the moment the pressurizing member begins to pressurize the second workpiece 2, the reaction force on the cylinder becomes excessive due to the large starting resistance, and a force greater than the load due to the pressure set on the cylinder is applied to the workpiece.

[0024] After the piston starts moving, it stabilizes when the load decreases due to the set pressure. The starting resistance is the frictional force that prevents the piston from starting, that is, the static friction force when it starts moving, and can therefore be rephrased as the maximum static friction force (resistance).

[0025] By setting the initial pressurization pressure lower than the load required to ensure conductivity, overshoot can be reduced. However, because the time it takes for thermosetting resins to begin melting is very short, controlling the cylinder pressure to switch is not easy.

[0026] In particular, packing-type air cylinders have high rubber sliding resistance, and when operated at low speeds, they vibrate more than expected or cause rattle (stick-slip phenomenon). As a result, they cannot cope with slight fluctuations in the air pressure inside the cylinder, causing overshoot and vibration, which can easily lead to workpiece displacement.

[0027] To reduce such workpiece displacement, a diaphragm-type cylinder can be considered. Because a diaphragm-type cylinder utilizes a membrane that changes its deflection in response to pressure changes, it has virtually no sliding parts. Therefore, it can significantly reduce starting resistance and suppress overshoot and vibration.

[0028] However, in recent years, the increasing precision and miniaturization of circuit boards and electronic components have led to a demand for tighter spacing between electronic components during crimping. To accommodate this tighter spacing, diaphragm-type air cylinders, with their circular cross-section, must have a smaller diameter, resulting in only low pressure. Therefore, to meet miniaturization requirements, it is necessary to use packing-type air cylinders. For example, by making a packing-type air cylinder a flattened shape with a narrower width, it becomes possible to accommodate the tighter spacing. However, this results in overshoot due to the stick-slip phenomenon mentioned above, making stable crimping impossible.

[0029] The inventors of this invention, after diligent research, discovered that by arranging two air cylinders with different pressurizing forces in series, the air cylinder with the smaller pressurizing force acts on the workpiece first, followed by the air cylinder with the larger pressurizing force, thereby reducing overshoot. Furthermore, the inventors also discovered that by combining a diaphragm-type air cylinder and a flat-type air cylinder and sequentially operating them during heating and pressing, it is possible to apply the load necessary to ensure conductivity to the workpiece while suppressing the occurrence of stick-slip phenomena. The details of this embodiment will be described below.

[0030] [composition] The configuration of the crimping device 40 of this embodiment will be described with reference to Figures 5 to 9. In Figure 5, the crimping direction by the crimping device 40 is the Z direction, and the directions that are orthogonal to each other in a plane perpendicular to the Z direction are the X direction and the Y direction. The Y direction is the direction between the front and back in the figure. When the crimping device 40 is installed so that the Z direction is vertical, the XY plane becomes a horizontal plane. In this case, the Z direction is the height direction, and the side facing the installation surface is called down, and the opposite side is called up. The rotation direction parallel to the XY plane is called the θ direction. The crimping device 40 has a crimping section 50, a pressure receiving section 60, a support section 70, and a control device 80.

[0031] (Crimped section) The crimping section 50 is a component that heats and crimps the lead 11 of the first workpiece 1 and the lead 21 of the second workpiece 2 via the ACF3. The crimping section 50 includes a pressurizing member 51, a heating section 52, a first pressurizing source 531, a second pressurizing source 532, and a drive mechanism 54. The second workpiece 2 is supplied to the crimping device 40 in a state where it has been temporarily crimped to the first workpiece 1 via the ACF3 by a temporary crimping device located in the preceding process to the crimping device 40.

[0032] Furthermore, multiple crimping sections 50 are provided at positions opposite to the multiple second workpieces 2 that are temporarily crimped to the first workpiece 1, which is supported by the stage 71 described later, and each is configured to operate independently (see Figure 6).

[0033] The pressurizing member 51 is a member that applies pressure to the second workpiece 2. The pressurizing member 51 has a roughly rectangular parallelepiped shape that is elongated in the Y direction and has a pressurizing surface of a length corresponding to the second workpiece 2. As shown in Figure 6, multiple pressurizing members 51 are arranged in a line in the Y direction, corresponding to each individual second workpiece 2. The configurations for applying pressure to the pressurizing members 51, such as the first pressurizing source 531 and the second pressurizing source 532, are also provided individually for each of the multiple pressurizing members 51. The surface of the pressurizing member 51 facing the second workpiece 2 has a band-shaped pressurizing portion 51a. This pressurizing portion 51a has a flat pressurizing surface that is parallel to and facing the second workpiece 2.

[0034] Although not shown in Figure 5, a cushion sheet B is interposed between the pressurizing member 51 and the second workpiece 2, as shown in Figures 7(A) and (B). The cushion sheet B is a buffer sheet, wound on a supply reel (not shown), fed out by rotation, and recovered by being wound onto a recovery reel. The pressurizing member 51 starting to pressurize the second workpiece 2 includes not only cases where the pressurizing member 51 directly contacts the second workpiece 2, but also cases where other members are interposed, such as when the cushion sheet B is present, resulting in indirect contact.

[0035] The heating unit 52 is a component that heats the pressurizing member 51. The heating unit 52 is built into the pressurizing member 51. The heating unit 52 uses, for example, a heater that generates heat when a voltage is applied. The heater is embedded in the pressurizing member 51 at the back of the pressurizing unit 51a.

[0036] The first pressurizing source 531 and the second pressurizing source 532 are devices that apply a load to the second workpiece 2 via the pressurizing member 51. The first pressurizing source 531 is an air cylinder that drives the first operating rod 531a. The first operating rod 531a moves in the Z direction.

[0037] The first actuation rod 531a is connected to the piston and acts together with the piston. The first actuation rod 531a protrudes upward and is biased upward in the Z direction by compressed air.

[0038] The first pressurizing source 531 in this embodiment uses an air cylinder in which a piston connected to the first operating rod 531a moves inside a cylindrical cylinder (the inside of the rectangular parallelepiped in Figure 8(A)) by the pressure of compressed air. A thin diaphragm is interposed between the piston and the inner wall of the cylinder, and the diaphragm expands and contracts inside the cylinder as the piston moves. In other words, the first pressurizing source 531 is a diaphragm-type cylinder.

[0039] Furthermore, the first pressurizing source 531 is connected to the pressurizing member 51 via a lifting block 53. The lifting block 53 is a rectangular parallelepiped-shaped member and is attached to a slider 547a, which will be described later, to stably raise and lower the pressurizing member 51.

[0040] A pneumatic circuit is connected to the first pressurizing source 531 via piping. This pneumatic circuit includes a positive pressure source 533 and a first regulator 534. The positive pressure source 533 is a source of positive-pressure air, including a compressor. The first regulator 534 sets the pressure in the first pressurizing source 531 to a first pressure.

[0041] The first pressure is the load generated at the start of pressurization on the first workpiece 1 and the second workpiece 2, which is such that no slippage occurs between the first workpiece 1 and the second workpiece 2.

[0042] The first regulator 534 uses an electro-pneumatic regulator that can set the pressure according to an electrical signal. However, a manual regulator may also be used, as it is sufficient to set the first pressure.

[0043] The second pressurizing source 532 is an air cylinder that drives a second operating rod 532a, which is arranged in series with the first pressurizing source 531 in the Z direction. Arranged in series means that the first pressurizing source 531 and the second pressurizing source 532 are aligned in the Z direction so that the first operating rod 531a and the second operating rod 532a are coaxial. In this embodiment, the second operating rod 532a of the second pressurizing source 532 points downward and is aligned with and overlaps the first operating rod 531a of the first pressurizing source 531.

[0044] The second actuation rod 532a is connected to the piston and acts together with the piston. The second actuation rod 532a is biased downward in the Z direction by compressed air.

[0045] Furthermore, the second pressurizing source 532 in this embodiment uses an air cylinder to which a piston connected to a second operating rod 532a moves inside due to the pressure of compressed air. The piston is in contact with the inner wall of the cylinder via a rubber packing, and the rubber packing slides inside the cylinder as the piston moves. In other words, the second pressurizing source 532 is a packing-type air cylinder.

[0046] More specifically, as shown in Figure 8(B), a flattened air cylinder with a shape that is narrow in the width direction (Y direction) and long in the depth direction (X direction) is used as the second pressurizing source 532. This allows for a large cross-sectional area while arranging them at a narrow pitch in the width direction. The second pressurizing source 532 has a larger surface area that determines the pressurizing force than the first pressurizing source 531. In other words, the pressurizing force obtained from the second pressurizing source 532 is greater than that obtained from the first pressurizing source 531. The surface area that determines the pressurizing force is, for example, the area of ​​the piston perpendicular to the first operating rod 531a and the second operating rod 532a, or the cross-sectional area inside the cylinder. For example, in this embodiment, the surface area that determines the pressurizing force of the second pressurizing source 532 is twice that of the first pressurizing source 531, but it is not limited to this value.

[0047] A pneumatic circuit is connected to the second pressurizing source 532 via piping. This pneumatic circuit includes a positive pressure source 533 and a second regulator 535. The positive pressure source 533 is shared with the first pressurizing source 531. The second regulator 535 sets the pressure in the second pressurizing source 532 to a second pressure. The second pressure is the pressure that applies a load to the first workpiece 1 and the second workpiece 2 that ensures conductivity by the ACF3.

[0048] The "load required to ensure conductivity" is the load at which the conductive particles 32 are crushed, resulting in the necessary conductivity between the lead 11 of the first workpiece 1 and the lead 21 of the second workpiece 2. This load is greater than the load used during temporary crimping, and crimping with this load is called final crimping. Furthermore, "crushing" means crushing to a moderate degree that ensures the necessary conductivity. The first pressure is a pressure value smaller than the second pressure.

[0049] The second regulator 535 uses an electro-pneumatic regulator that can set the pressure according to an electrical signal. However, a manual regulator may also be used, as it only needs to be able to set the second pressure.

[0050] Furthermore, the pressure of the first pressurizing source 531 and the pressure of the second pressurizing source 532 may be set to a common pressure using a common regulator. In other words, the pressure of two air cylinders may be set with one regulator, and the set first and second pressures may be the same. For example, the pressure corresponding to the second pressure exemplified above may be set as the common pressure. Even in this case, by using a diaphragm-type cylinder for the first pressurizing source 531, the diaphragm-type cylinder, which has low starting resistance, will react to the second pressure and act first, thus enabling crimping with suppressed overshoot and vibration.

[0051] The drive mechanism 54 is a mechanism that drives the pressurizing member 51, the first pressurizing source 531, and the second pressurizing source 532 in the crimping direction so that the pressurizing member 51 pressurizes the second workpiece 2 with a first pressure set at the first pressurizing source 531, and then pressurizes the second workpiece 2 with a second pressure set at the second pressurizing source 532.

[0052] The drive mechanism 54 compresses the first pressure source 531 and then the second pressure source 532 of the second pressure source 532 after the pressurizing member 51 has come into contact with the second workpiece 2 and pressurizing has begun. In other words, the drive mechanism 54 moves the pressurizing member 51, the first pressure source 531 and the second pressure source 532 in the pressing direction, and after the pressurizing member 51 has come into contact with the second workpiece 2, the first operating rod 531a compresses the cylinder of the first pressure source 531, and then the second operating rod 532a compresses the cylinder of the second pressure source 532. As a result, a first pressure (smaller than the second pressure) from the first pressure source 531 is applied to the second workpiece 2, and then a second pressure (larger than the first pressure) from the second pressure source 532 is applied to the second workpiece 2.

[0053] More specifically, the drive mechanism 54 includes a frame 541, a motor 542, a ball screw 543, a nut member 544, a support 545, guide rails 546 and 547, a biasing member 548, and a regulating part 549.

[0054] The frame 541 is a box-shaped member fixed to a housing (not shown) or the like of the crimping device 40. The motor 542 is a drive source fixed to the top of the frame 541. The ball screw 543 is arranged inside the frame 541 along the Z direction and is supported to rotate around its axis. The nut member 544 is a member that moves up and down along the ball screw 543 as the ball screw 543 rotates. The nut member 544 protrudes from a window hole formed on the side of the frame 541.

[0055] The support 545 is slidably mounted in the crimping direction and supports the first pressure source 531, the second pressure source 532, and the pressure member 51. The support 545 is attached to a nut member 544 protruding from the frame 541. The guide rail 546 is a rail provided on the frame 541 along the Z direction, and the support 545 is attached to a slider 547a that slides along the guide rail 546. As a result, the support 545 is mounted to be movable in the Z direction by a motor 542, which is the drive source. As the support 545 moves, the first pressure source 531, the second pressure source 532, and the pressure member 51 move.

[0056] The guide rail 547 is a rail provided on the support 545 along the Z direction. The lifting block 53 is attached to a slider 547a that slides along the guide rail 547.

[0057] The second pressurizing source 532 is fixed to the support 545. The first pressurizing source 531 is positioned between the second pressurizing source 532 and the lifting block 53. As a result, the second operating rod 532a of the second pressurizing source 532, the first operating rod 531a of the first pressurizing source 531, and the pressurizing member 51 are arranged in series. The pressurizing portion 51a of the pressurizing member 51 lies on the extension of the axes of the second operating rod 532a and the first operating rod 531a.

[0058] The biasing member 548 is provided between the first pressurizing source 531 and the second pressurizing source 532, and biases the opposing first operating rod 531a and the second operating rod 532a in a direction toward contact with each other. The biasing member 548 allows relative movement between the first pressurizing source 531 and the second pressurizing source 532, while preventing them from separating. In this embodiment, the biasing member 548 is a spring connected in the Z direction between the first pressurizing source 531 and the second pressurizing source 532.

[0059] The restricting unit 549 restricts the compression operation of the first pressure source 531 so that, during the heating and pressing of the second workpiece 2 by the pressurizing member 51, the pressure is switched from the first pressure source 531 to the second pressure source 532. In other words, the restricting unit 549 limits the compression of the first pressure source 531 to a certain amount.

[0060] More specifically, the regulating section 549 includes a regulating member 549a and a receiving member 549b. The regulating member 549a is a plate-shaped member provided on the first operating rod 531a. The regulating member 549a moves together with the first operating rod 531a. The receiving member 549b is a plate-shaped member through which the first operating rod 531a passes and which is fixed to the lifting block 53 via a support column or the like. The receiving member 549b is fixed to the lifting block 53 and does not move with the movement of the first operating rod 531a.

[0061] As the support 545 moves due to the drive mechanism 54, the pressurizing member 51, the first pressurizing source 531, and the second pressurizing source 532 move together. After the pressurizing member 51 contacts the second workpiece 2, the first operating rod 531a of the first pressurizing source 531 begins to compress, but since the second pressurizing source 532 is subjected to a second pressure, the second operating rod 532a does not begin to compress. As the compression of the first operating rod 531a progresses and the regulating member 549a contacts the receiving member 549b, the movement of the first operating rod 531a stops, the compression of the first pressurizing source 531 stops, and the compression operation by the second operating rod 532a of the second pressurizing source 532 begins.

[0062] (Pressure receiving part) As shown in Figures 5 and 7, the pressure receiving portion 60 is a member that clamps the second workpiece 2 and the first workpiece 1 between itself and the pressurizing portion 51a of the pressurizing member 51. The pressure receiving portion 60 is a substantially rectangular parallelepiped-shaped member that can move up and down by a lifting mechanism (not shown) and has the same length as the pressurizing member 51. This pressure receiving portion 60 has a backup portion 61 and a heating portion 62. The backup portion 61 is provided on the surface facing the pressurizing portion 51a and extends in the Y direction, that is, in the direction of the edge of the first workpiece 1, and protrudes in a strip shape. The backup portion 61 has a flat receiving surface on the surface facing the pressurizing surface of the pressurizing portion 51a.

[0063] The pressure receiving section 60 is set to rise so that the receiving surface of the backup section 61 is at the same height as the lower surface of the first workpiece 1, which is supported by the stage 71 described later. Alternatively, the pressure receiving section 60 may be fixed in place so that the receiving surface of the backup section 61 is at the same height as the lower surface of the first workpiece 1.

[0064] The heating element 62 is a component built into the pressure receiving element 60 that heats the backup element 61. The heating element 62 uses, for example, a heater that generates heat when a voltage is applied. Multiple heating elements 62 are embedded at equal intervals within the pressure receiving element 60 on the back of the backup element 61.

[0065] (Support part) The support unit 70 is a device that supports the first workpiece 1. The support unit 70 includes a stage 71 and a moving device 72. The stage 71 is a flat platform that supports the first workpiece 1 in the horizontal direction. The stage 71 has a plurality of holes connected to a vacuum source, although these are not shown in the figure. This configures the stage 71 to be able to hold the first workpiece 1 by suction. The moving device 72 is a device that supports the stage 71 so that it can move freely in the X, Y, Z, and θ directions.

[0066] The support unit 70 receives the first workpiece 1, which has been temporarily crimped to the second workpiece 2 via the ACF3, from a preceding process such as a temporary crimping device, and moves the first workpiece 1 so that the second workpiece 2 is in a crimping position where it is crimped to the first workpiece 1 by the pressurizing unit 51a. The support unit 70 also hands over the first workpiece 1, which has completed the crimping work, to a subsequent process such as a substrate storage device.

[0067] (Control device) The control device 80 is a device that controls the crimping device 40. This control device 80 is composed of, for example, a dedicated electronic circuit or a computer that operates with a predetermined program. In other words, the control device 80 controls the operation of the crimping device 40 by activating the heating unit 52 of the crimping unit 50, the drive mechanism 54, the heating unit 62 of the pressure receiving unit 60, the moving device 72 of the support unit 70, etc.

[0068] The control device 80 stores a program that controls the heating temperature of the heating units 52 and 62, the operation and rotational speed of the drive mechanism 54 driven by the motor 542, the pressure settings of the first regulator 534 and the second regulator 535, and the operation of the moving device 72. The control device 80 controls each part by reading and executing the program and data from a processing unit such as a PLC or CPU. By changing the program and data, it is possible to accommodate a wide variety of specifications for the first workpiece 1, the second workpiece 2, and the ACF3 that are to be crimped.

[0069] As shown in Figure 9, the control device 80 includes a detection unit 81, a mechanism control unit 82, a storage unit 83, a setting unit 84, and an input / output control unit 85. The detection unit 81 detects the completion of pressurization of the pressurizing member 51 onto the second workpiece 2 by detecting that the position coordinates of the pressurizing surface of the pressurizing unit 51a, which is moved by the drive mechanism 54, have reached a preset position coordinate. For example, the distance is calculated by subtracting the thickness of the first workpiece 1 and the second workpiece 2 (thickness in the temporary crimping state) from the distance between the position coordinates of the reference position which is the starting end of the movement of the pressurizing surface and the position coordinates of the mounting surface of the first workpiece 1 (receiving surface of the backup unit 61). The position coordinates moved in the Z direction by the calculated distance from the reference position coordinates become the pressurization start position. Furthermore, for pressurization for heat crimping, contact with the second workpiece 2 is insufficient; a predetermined amount of pressing is required, including the thickness of the cushion sheet B. The position coordinates moved by a predetermined amount of pressing from the pressurization start setting position become the pressurization completion setting position.

[0070] Furthermore, the control device 80 controls the temperature of the heating unit 52 to reach the curing temperature necessary for thermal curing the substrate 31 of the ACF3, and also controls the temperature of the heating unit 62 to reach a temperature that assists the heating unit 52.

[0071] The mechanism control unit 82 operates the motor 542, the first regulator 534, the second regulator 535, etc. The memory unit 83 stores the information necessary for the control of this embodiment. The information stored in the memory unit 83 includes position coordinates, first pressure, second pressure, heating and crimping time, etc.

[0072] The setting unit 84 is a processing unit that sets information in the storage unit 83 according to the input. The input / output control unit 85 is an interface that controls signal conversion and input / output between each unit to be controlled.

[0073] Furthermore, an input device 91 and an output device 92 are connected to the control device 80. The input device 91 is an input means such as a switch, touch panel, keyboard, or mouse for the operator to operate the crimping device 40 via the control device 80. The operator can input various types of information set in the storage unit 83 using the input device 91.

[0074] The output device 92 is an output means such as a display, lamp, or meter that makes information for checking the status of the device visible to the operator. For example, the output device 92 can display an input screen for information received from the input device 91.

[0075] [Operation] Next, an example of operation of this embodiment will be described with reference to Figures 10 and 11, in addition to Figures 1 to 9. Figure 10 is a side view showing the heating and crimping procedure of the crimping device 40, and Figure 11 is a flowchart showing the heating and crimping procedure. The pressure of the first pressurizing source 531, which is an air cylinder, is set to a first pressure by the first regulator 534, and the pressure of the second pressurizing source 532 is set to a second pressure by the second regulator 535. The pressurizing member 51 and the backup unit 61 are heated to a set temperature by the heating units 52 and 62, respectively. In the following operation, multiple crimping units 50 are performed independently and simultaneously on multiple second workpieces 2 that have been temporarily crimped to the first workpiece 1, but the operation example of one crimping unit 50 will be described.

[0076] First, the first workpiece 1, to which the second workpiece 2 has been temporarily pressed via the ACF 3, is placed on the stage 71 of the support section 70, and the moving device 72 moves the first workpiece 1 so that the portion to which the first workpiece 1 and the second workpiece 2 are temporarily pressed via the ACF is positioned opposite the pressurizing section 51a. Then, the pressure receiving section 60 rises so that the receiving surface of the backup section 61 is in contact with the lower surface of the first workpiece 1 (see Figure 10(A)).

[0077] In this state, the drive mechanism 54 moves the support 545, causing the pressurizing member 51 to begin moving downward toward the second workpiece 2 (step S101). The speed of this movement is reduced to 10 mm / s once the distance from the second workpiece 2 exceeds 10 mm.

[0078] As the pressurizing member 51 continues to move (NO in step S102), and as shown in Figure 10(B), when the pressurizing surface of the pressurizing part 51a comes into contact with the second workpiece 2 (YES in step S102), the pressurizing member 51 begins to pressurize. However, as the support body 545 continues to move, the first operating rod 531a of the first pressurizing source 531 is pushed and moved by the support body 545 via the second pressurizing source 532. In other words, the inside of the cylinder of the first pressurizing source 531 is compressed by the piston.

[0079] At this time, the first pressurizing source 531 applies a load to the second workpiece 2 with a first pressure via the pressurizing member 51 (step S103). The first pressure is a pressure at which slippage does not occur between the first workpiece 1 and the second workpiece 2 at the start of pressurization. In particular, since the first pressurizing source 531 is a diaphragm-type cylinder, the stick-slip phenomenon is suppressed. Then, as shown in Figure 10(C), the compression operation of the first operating rod 531a is stopped by the regulating part 549 (YES in step S104).

[0080] Furthermore, as the support 545 continues to move, the second pressurizing source 532 is pushed by the support 545 and continues to move. The second operating rod 532a of the second pressurizing source 532 applies a load to the second workpiece 2 with second pressure via the first pressurizing source 531 and pressurizing member 51, so the inside of the cylinder of the second pressurizing source 532 is compressed by the piston (step S105). In other words, the second operating rod 532a moves relative to the first pressurizing source 531. Thus, the movement of the first operating rod 531a and the second operating rod 532a also includes the relative movement with respect to the cylinder of the first pressurizing source 531 and the cylinder of the second pressurizing source 532, respectively. Then, as shown in Figure 10(D), when the detection unit 81 detects that the amount of movement has reached a preset position coordinate (YES in step S106), the support 545 stops, and the second operating rod 532a stops (step S107). The travel distance of the first operating rod 531a and the second operating rod 532a during compression is, for example, about 2 mm, but is not limited to this.

[0081] As a result, as shown in Figure 3(B), the conductive particles 32 are crushed, ensuring conductivity between the lead 21 and the lead 11, and establishing an electrical connection. Subsequently, until the curing of the substrate 31 progresses further and the heating and pressing time has elapsed (NO in step S108), the second workpiece 2 and the first workpiece 1 are joined together, and a mechanical connection is established.

[0082] After the pressurization is complete and a predetermined heating and crimping time has elapsed (YES in step S108), the drive mechanism 54 raises the pressurizing member 51, thereby releasing the second workpiece 2 from the pressurization (step S109). The heating and crimping time is, for example, 5 seconds from the completion of pressurization.

[0083] [Effects and Effects] (1) According to the embodiment described above, the ACF3, which has a thermosetting resin as the base material 31, has a crimping section 50 that heats and presses together the first workpiece 1 and the second workpiece 2, and the crimping section 50 has a pressurizing member 51 that pressurizes the second workpiece 2, a first pressurizing source 531 which is an air cylinder that drives the first pressurizing rod 531a and has a first operating rod 531a arranged in series with the pressurizing member 51 in the crimping direction, and the first pressurizing source 531 is arranged in series with the pressurizing source 531 The system includes a second operating rod 532a, a second pressure source 532 which is an air cylinder with a larger surface area for determining the pressure than the first pressure source 531, and a drive mechanism 54 which drives the pressure member 51, the first pressure source 531, and the second pressure source 532 in the crimping direction so that the pressure member 51 pressurizes the second workpiece 2 with a first pressure set at the first pressure source 531, and then pressurizes the second workpiece 2 with a second pressure set at the second pressure source 532.

[0084] Therefore, at the start of pressurization on the workpiece, a first pressure is applied by the first pressurization source 531. However, since this pressure is smaller than the second pressure from the second pressurization source 532, overshoot is suppressed on the workpiece, preventing damage to the workpiece and the generation of defective products due to workpiece displacement.

[0085] (2) The first pressure is the load generated at the start of pressurization on the second workpiece 2, which does not cause slippage between the first workpiece 1 and the second workpiece 2. The second pressure is the pressure applied to the second workpiece 2 that ensures conductivity by ACF3. Therefore, it is possible to ensure conductivity by ACF3 while suppressing slippage between the first workpiece 1 and the second workpiece 2.

[0086] (3) After the pressurizing member 51 comes into contact with the second workpiece 2 and pressurizing begins, the drive mechanism 54 compresses the first pressurizing source 531, and then compresses the second operating rod 532a. As a result, as the drive mechanism 54 moves in the pressing direction, a first pressure with a small pressurizing force and a second pressure with a large pressurizing force can be applied to the second workpiece 2 in sequence, eliminating the need for complex control.

[0087] (4) The drive mechanism 54 has a support body 545 that is movable in the crimping direction by a motor 542, and the first pressure source 531, the second pressure source 532 and the pressure member 51 are movable together with the support body 545, and has a restricting unit 549 that restricts the movement of the first pressure source 531 so that the pressure is switched from the first pressure source 531 to the second pressure source 532 during the heating and crimping of the second workpiece 2 by the pressure member 51. Thus, the restricting unit 549 can control the switching from the first pressure to the second pressure.

[0088] (5) The first pressurizing source 531 is a diaphragm-type cylinder. Therefore, when the pressurizing member 51 comes into contact with the second workpiece 2, it is possible to apply pressure while suppressing the stick-slip phenomenon. In other words, a stable load can be applied, and the accuracy of the pressing on the second workpiece 2 and the stabilization of the indentation can be improved. Furthermore, even if, for example, a packing-type air cylinder is used as the second pressurizing source 532, the stick-slip phenomenon that occurs can be absorbed by the diaphragm-type cylinder.

[0089] (6) The second pressure source 532 is a flattened cylinder. Therefore, it is possible to apply the large pressure necessary to ensure conductivity without increasing the length in the width direction (Y direction). As a result, even when pressing a large number of second workpieces 2, multiple second pressure sources 532 can be accommodated in the space corresponding to the spacing between them.

[0090] [Differentiation] (1) The first pressurizing source 531 and the second pressurizing source 532 can be air cylinders. However, as described above, by combining a flat type and a diaphragm type, it is possible to accommodate narrow pitches while suppressing overshoot.

[0091] (2) The arrangement of the first pressurizing source 531 and the second pressurizing source 532 is not limited to the above-described configuration. For example, the second pressurizing source 532 may be placed between the first pressurizing source 531 and the pressurizing member 51. In this case as well, the small first pressure from the first pressurizing source 531 acts first, followed by the larger second pressure from the second pressurizing source 532, so the same effect as above can be obtained. In addition, the first operating rod 531a of the first pressurizing source 531 may be positioned to face downwards.

[0092] (3) The first workpiece 1 may be a component having conductive parts other than the display panel. The conductive parts are not limited to the plane of the first workpiece 1, but may also be the sides of the first workpiece 1. For example, the first workpiece 1 may be a rectangular substrate with leads exposed on its sides. In this case, it is not necessary to provide a pressure receiving portion 60 that sandwiches the second workpiece 2 and the first workpiece 1 on the side facing the crimping portion 50.

[0093] The substrate material for the second workpiece 2 is not limited to a flexible resin material. A glass substrate may be used for the second workpiece 2. The first workpiece 1 may use a flexible resin substrate instead of a glass substrate.

[0094] (4) The above-described embodiment was an embodiment in which multiple pressing surfaces of pressing members 51, each corresponding to a second workpiece 2, were arranged in a row. However, the method of crimping is not limited to this, and multiple second workpieces 2 that have been temporarily crimped to one side of the first workpiece 1 may be crimped all at once using a single long pressing member 51. In other words, the pressing member 51 may have a length that allows multiple second workpieces 2 that have been temporarily crimped to the first workpiece 1 to be heat-crimped all at once. The configuration for applying pressure to the pressing members 51, such as the first pressure source 531 and the second pressure source 532, may also be a single configuration corresponding to the long pressing member 51.

[0095] Furthermore, although the above embodiment describes a method of permanently crimping multiple second workpieces 2 onto one side of the first workpiece 1, it can also be applied to a method of permanently crimping a single second workpiece 2 onto one side of the first workpiece 1, as shown in Figure 1(B). In this case, permanent crimping may be performed with multiple first workpieces 1 placed on the stage 71. Moreover, it can also be applied to a method of permanently crimping one or more second workpieces 2 onto multiple sides of the first workpiece 1.

[0096] Furthermore, even if the configuration is such that the first workpiece 1 is the receiving side that supports the second workpiece 2, or even if the configuration is such that pressure is applied from both the first workpiece 1 and the second workpiece 2.

[0097] [Other embodiments] Although embodiments and modifications of the present invention have been described above, these embodiments and modifications are presented as examples only and are not intended to limit the scope of the invention. These novel embodiments described above can be implemented in various other forms, and various omissions, substitutions, combinations, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the invention described in the claims. [Explanation of Symbols]

[0098] 1. First Work 2. Second Work 11, 21 Reed 3 ACF 31 Base material 32 Conductive particles 40 Crimping device 50 Crimping section 51 Pressurizing member 51a Pressurized section 52 Heating section 531 First pressurization source 531a First operating rod 532 Second pressurization source 532a Second operating rod 53 Elevating blocks 533 Positive pressure source 534 First Regulator 535 Second regulator 54 Drive mechanism 541 Frame 542 Motor 543 Ball screw 544 Nut component 545 Support 546, 547 Guide rails 545a, 547a Slider 548 Biasing member 549 Regulatory Department 549a Regulating member 549b Support member 60 Pressure receiving section 61 Backup section 62 Heating section 70 Support part 71 stages 72 Mobile device 80 Control device 81 Detection unit 82 Mechanism Control Unit 83 Memory section 84 Settings Section 85 Input / Output Control Unit 91 Input device 92 Output device

Claims

1. It has a crimping section that heats and presses a pair of workpieces together via an anisotropic conductive member with a thermosetting resin base material. The crimped portion is, A pressurizing member for pressurizing the workpiece, The pressurizing member has a first operating rod arranged in series in the crimping direction, and a first pressurizing source is an air cylinder that drives the first operating rod, A second pressure source is an air cylinder that drives a second operating rod arranged in series with the first pressure source in the crimping direction, and has a larger surface area for determining the applied pressure than the first pressure source. A drive mechanism drives the pressurizing member, the first pressurizing source, and the second pressurizing source in the crimping direction so that the pressurizing member pressurizes the workpiece with a first pressure set in the first pressurizing source, and then pressurizes the workpiece with a second pressure set in the second pressurizing source. A crimping device characterized by having the following features.

2. The first pressure is the pressure at which the load generated when pressurizing the workpiece begins does not cause slippage in the workpiece. The second pressure is the pressure applied to the workpiece that ensures conductivity by the anisotropic conductive member. The crimping device according to claim 1, characterized in that it is a crimping device.

3. The crimping device according to claim 1, characterized in that the drive mechanism compresses the first pressure source and then the second pressure source after the pressurizing member comes into contact with the workpiece and pressurizing begins.

4. The drive mechanism has a support that is movable in the crimping direction by a drive source, The first pressure source, the second pressure source, and the pressurizing member are provided to be movable together with the support, The crimping device according to claim 1, characterized in that it has a restricting part that restricts the compression operation of the first operating rod so as to switch from pressurization by the first pressurization source to pressurization by the second pressurization source during the heating and crimping of the workpiece by the pressurizing member.

5. The crimping device according to claim 1, characterized in that the first pressure source is a diaphragm-type cylinder.

6. The crimping device according to claim 1 or 5, characterized in that the second pressure source is a flat cylinder.

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