Pasting device and pasting method

Abstract

To provide a pasting device capable of effectively utilizing a roll sheet to be used when pasting a plurality of pasting portions included in a sheet to a plurality of objects to be pasted.SOLUTION: A pasting device includes: a table for supporting an object to be pasted; a processing unit for pasting a pasting portion to the object to be pasted supported by the table and separating it from the sheet; and a controller for controlling the processing unit. The processing unit includes: a supply roller on which a roll sheet obtained by winding a sheet around a cylindrical core is attached; and a motor for applying, to the roll sheet, force of pulling out the sheet from the roll sheet attached to the supply roller. The controller includes: a memory for storing a threshold value of a physical quantity using the torque of the motor as a parameter; and a processor for determining whether the roll sheet has reached its usage limit by comparing an actual value of the physical quantity when operating the motor with a threshold value.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to an attachment device and an attachment method for attaching a plurality of attachment portions included in a sheet to a plurality of objects, respectively. [Background technology]

[0002] Device chips such as ICs (Integrated Circuits) are essential components in various electronic devices such as mobile phones, personal computers, etc. Such chips are manufactured, for example, by thinning a wafer on which multiple devices are formed on the front surface and then dividing it into regions each containing an individual device.

[0003] For example, a wafer is thinned by grinding the back side in a grinding machine, and is divided by removing the boundaries between multiple devices in a cutting machine or laser processing machine. However, during this thinning, the front side of the wafer is pressed strongly, which may damage the multiple devices. Also, during this division, the manufactured chips may become separated, making them difficult to handle.

[0004] In consideration of these points, it is common to apply a sheet to the surface of the wafer in an application device before these processes (see, for example, Patent Document 1). Specifically, this application device is provided with a supply roller on which a rolled sheet is attached, the rolled sheet being obtained by winding a sheet (elongated sheet) whose width is longer than the wafer and whose length is an order of magnitude longer than the width, around a cylindrical core.

[0005] In this bonding device, the elongated sheet is pulled out from the roll sheet attached to the supply roller, and a part of the sheet (specifically, an attachment portion having a shape corresponding to the wafer) is attached to the surface of the wafer (subject) and separated from the elongated sheet. Furthermore, in this bonding device, the same operation is repeated until the roll sheet reaches its usage limit, whereby the multiple attachment portions included in the sheet are respectively attached to the multiple objects. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2016-8104 A Summary of the Invention [Problem to be solved by the invention]

[0007] The above-mentioned application device is provided with a sensor for detecting when the remaining amount of the rolled sheet is low. Specifically, this sensor is capable of detecting the metal constituting the supply roller. Then, when the outer diameter of the rolled sheet becomes smaller as the sheet is repeatedly applied to the substrate, the sensor becomes able to detect the supply roller through the rolled sheet.

[0008] In addition, in this bonding device, when the supply roller is detected by the sensor, it is determined that the roll sheet has reached its usage limit. However, when it is determined that the roll sheet has reached its usage limit in this way, there is a risk that the roll sheet with a usable portion remaining will be discarded.

[0009] In view of this, an object of the present invention is to provide an attachment device and attachment method that can effectively utilize a roll sheet used when attaching multiple attachment portions contained in the sheet to multiple objects. [Means for solving the problem]

[0010] According to one aspect of the present invention, there is provided an adhesion device for adhering a plurality of adhesive portions included in a sheet to a plurality of substrates, the adhesion device comprising: a table for supporting any of the plurality of substrates; a processing unit for adhering any of the plurality of adhesive portions to any of the plurality of substrates supported by the table and separating them from the sheet; and a controller for controlling the processing unit, the processing unit having a supply roller on which a roll sheet obtained by winding the sheet around a cylindrical core is attached, and a motor for applying a force to the roll sheet so as to pull the sheet from the roll sheet attached to the supply roller, the controller having a memory for storing a threshold value of a physical quantity having the torque of the motor as a parameter, and a processor for determining whether the roll sheet has reached its usage limit by comparing the actual value of the physical quantity when the motor is operated with the threshold value.

[0011] In the bonding device of the present invention, it is preferable that the end of the sheet is fixed to the core, and the processor determines that the rolled sheet has reached its usage limit when the actual value of the physical quantity is greater than the threshold value. Alternatively, in the bonding device of the present invention, it is preferable that the end of the sheet is not fixed to the core, and the processor determines that the rolled sheet has reached its usage limit when the actual value of the physical quantity is smaller than the threshold value. Furthermore, in the bonding device of the present invention, it is preferable that the processing unit further includes a sensor for detecting that the outer diameter of the rolled sheet attached to the supply roller has become smaller than a predetermined value, and the processor starts to determine whether the rolled sheet has reached its usage limit after detecting that the outer diameter of the rolled sheet has become smaller than the predetermined value by the sensor.

[0012] According to another aspect of the present invention, there is provided a method for attaching a plurality of adhesive portions included in a sheet to a plurality of objects to be attached, the method comprising: a mounting step of mounting a roll sheet obtained by winding the sheet around a cylindrical core onto a supply roller; and a bonding step of bonding the plurality of adhesive portions to the plurality of objects to be attached, respectively, after the mounting step, until it is determined that the roll sheet mounted on the supply roller has reached its usage limit. The bonding step includes a carrying step of carrying one of the plurality of objects to a table for supporting one of the plurality of objects to be attached, and a carrying step of applying a force to the roll sheet mounted on the supply roller so as to pull the sheet out of the roll sheet mounted on the supply roller. The method includes repeating an operation step of operating a motor for applying adhesive to a sheet, a processing step of adhering any of the multiple adhesive portions contained in the sheet pulled out from the roll sheet attached to the supply roller to any of the multiple substrates supported by the table and separating the adhesive portion from the sheet, and a transport step of transporting any of the multiple substrates to which any of the multiple adhesive portions are attached from the table, and the determination as to whether the roll sheet has reached its limit of use is made by comparing the actual value of a physical quantity, the torque of the motor being a parameter in the operation step, with a threshold value.

[0013] In the bonding method of the present invention, it is preferable that the end of the sheet is fixed to the core, and that the rolled sheet is determined to have reached its usage limit when the actual value of the physical quantity is greater than the threshold value. Alternatively, in the bonding method of the present invention, it is preferable that the end of the sheet is not fixed to the core, and that the rolled sheet is determined to have reached its usage limit when the actual value of the physical quantity is smaller than the threshold value. Furthermore, in the bonding method of the present invention, it is preferable that the determination of whether the rolled sheet has reached its usage limit is started after the outer diameter of the rolled sheet attached to the supply roller becomes smaller than a predetermined value. Effect of the Invention

[0014] In the present invention, whether or not the roll sheet has reached its usage limit is determined by comparing the actual value of a physical quantity, the parameter of which is the torque of the motor for applying a force to the roll sheet such as to pull the sheet from the roll sheet attached to the supply roller, with a threshold value.

[0015] The torque suddenly changes when the edge of the sheet is pulled from the core, i.e., if the edge of the sheet is fixed to the core, the torque suddenly increases at this time, whereas if the edge of the sheet is not fixed to the core, the torque suddenly decreases at this time.

[0016] Therefore, in the present invention, it is possible to determine that the roll sheet has reached its usage limit when the entire sheet is pulled out from the roll sheet, and as a result, it is possible to effectively utilize the roll sheet that is used when attaching the multiple attachment portions included in the sheet to multiple attachment targets. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 is a perspective view that shows a schematic example of an application device for applying a plurality of application portions included in a sheet to a plurality of objects. [Diagram 2] FIG. 2 is a perspective view showing a schematic example of an object to which an adhering portion included in a sheet is adhered in the adhering device. [Diagram 3] FIG. 3 is a perspective view that illustrates an example of a roll sheet that is mounted on a supply roller included in the bonding device. [Figure 4] FIG. 4 is a flow chart that illustrates an example of a sticking method in which a sticking device sticks a plurality of sticking portions included in a sheet to a plurality of objects. [Diagram 5] FIG. 5 is a perspective view showing the bonding device after the mounting step shown in FIG. [Figure 6] FIG. 6 is a flow chart that illustrates an example of the adhering step shown in FIG. [Figure 7] FIG. 7 is a perspective view that illustrates the loading step illustrated in FIG. [Figure 8] FIG. 8 is a perspective view that illustrates the operation steps shown in FIG. [Figure 9] FIG. 9 is a perspective view showing the process steps shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] An embodiment of the present invention will be described with reference to the accompanying drawings. Fig. 1 is a perspective view showing a typical example of a sticking device for sticking a plurality of sticking parts included in a sheet to a plurality of objects to be stuck. In Fig. 1, some of the components of the sticking device are shown in functional blocks.

[0019] The bonding device 2 shown in Fig. 1 has a table base 4. A cylindrical recess 4a is formed in the center of the upper surface of this table base 4, and a disk-shaped holding table 6 is provided in this recess 4a so that a gap is formed between the side surface of the recess 4a and the side surface of the recess 4a.

[0020] The holding table 6 has a disk-shaped frame 6a made of, for example, ceramics. The frame 6a has a disk-shaped bottom wall and a cylindrical side wall standing upright from the outer periphery of the bottom wall. That is, a recess defined by the bottom wall and the side wall is formed on the upper surface side of the frame 6a.

[0021] A disk-shaped porous plate 6b made of porous ceramics or the like is fixed in the recess. Furthermore, a flow path is formed in the frame 6a, and this flow path communicates with a pressure adjustment mechanism 8 having, for example, a suction source (not shown) and an air supply source (not shown).

[0022] The suction source includes, for example, an ejector, etc. The air supply source includes, for example, a tank for storing air, a filter for removing foreign matter mixed in the air supplied from the tank, and a regulator for adjusting the pressure of the air supplied from the tank.

[0023] When the suction source communicating with the flow path formed in the frame 6a is operated, the pressure in this flow path becomes negative, and a suction force acts on the space near the upper surface of the porous plate 6b. When the operation of the suction source is stopped and the air supply source is operated while the pressure in this flow path is negative, the pressure in this flow path returns to normal pressure, and the suction force no longer acts on the space near the upper surface of the porous plate 6b.

[0024] Therefore, when the suction source is operated with the object placed on the holding table 6, it is possible to hold the object using the upper surface of the holding table 6 as the holding surface. Furthermore, when the suction source is stopped and the air supply source is operated with the object held in this way, it is possible to easily carry the object off the holding table 6.

[0025] Fig. 2 is a perspective view showing a schematic example of an object to be adhered held on the holding surface of the holding table 6. The object to be adhered 11 shown in Fig. 2 is, for example, a wafer made of a semiconductor material such as silicon (Si), and including a circular front surface 11a and a back surface 11b having a diameter approximately equal to that of the holding surface of the holding table 6.

[0026] The adherend 11 is divided into a plurality of regions by a plurality of division lines 13 set in a lattice pattern, and devices 15 such as ICs are formed on the surface side of each region. Note that the surface 11a side of the adherend 11 has an uneven shape due to the presence of the plurality of devices 15.

[0027] 1, a processing unit 10 is provided above the table base 4 and the holding table 6. The processing unit 10 is located in front of and above the holding table 6 and has a supply roller 12 extending in the left-right direction. A roll sheet having a sheet including an adhesion portion to be adhered to the object 11 can be attached to the supply roller 12.

[0028] Fig. 3 is a perspective view showing a schematic example of a roll sheet mounted on the supply roller 12. The roll sheet 21 shown in Fig. 3 includes a cylindrical core 23 and a sheet 25 wound around the core 23. The end of the sheet 25 is fixed to the core 23. The sheet 25 includes a plurality of attachment portions 25a having a shape corresponding to the attachment object 11 (in short, a circular shape).

[0029] The width of each of the core 23 and the sheet 25 is longer than the diameter of the recess 4a formed in the table base 4 and shorter than the width (length in the left-right direction) of the upper surface of the table base 4. The sheet 25 has, for example, a flexible film-like base material 25b and an adhesive layer 25c provided on one surface of the base material 25b (the surface located on the inner side of the roll sheet 21).

[0030] Specifically, the base material 25b is made of polyolefin (PO), polyethylene terephthalate (PET), polyvinyl chloride (PVC), polystyrene (PS), etc. The adhesive layer 25c is made of ultraviolet-curing silicone rubber, an acrylic material, an epoxy material, etc. Furthermore, the other surface of the base material 25b is subjected to a surface treatment to prevent the adhesive layer from adhering.

[0031] When the rolled sheet 21 is attached to the supply roller 12, the rolled sheet 21 is placed so that the core 23 covers the supply roller 12 shown in Fig. 1. A sensor 14 is provided near the supply roller 12 to detect when the outer diameter of the rolled sheet 21 becomes smaller than a predetermined value due to a decrease in the remaining amount of the sheet 25 in the rolled sheet 21. Examples of the sensor 14 include a distance sensor and a photosensor.

[0032] When a distance sensor is used as the sensor 14, for example, the sensor 14 provided directly above the supply roller 12 measures the distance to the rolled sheet 21 attached to the supply roller 12. That is, in this case, by referring to the measured distance, it is possible to know that the outer diameter of the rolled sheet 21 has become smaller than a predetermined value.

[0033] Furthermore, when a photosensor is used as sensor 14, for example, a laser beam is emitted from a light source positioned directly below a light receiving section toward sensor 14, which is provided at a position slightly shifted forward or backward from directly above supply roller 12. If the remaining amount of sheet 25 on rolled sheet 21 is large, the laser beam is blocked by rolled sheet 21 without reaching the light receiving section, whereas if the remaining amount is small, the laser beam reaches the light receiving section. Therefore, in this case, if the laser beam is received by sensor 14, it can be known that the outer diameter of rolled sheet 21 has become smaller than a predetermined value.

[0034] A pair of guide rollers 16a, 16b, each extending in the left-right direction, are provided below the supply roller 12 in a front-rear manner and close to each other. The width of each of the guide rollers 16a, 16b is wider than the width of the sheet 25. Of the pair of guide rollers 16a, 16b, the front guide roller 16a is surface-treated to prevent the adhesive layer from adhering thereto. The pair of guide rollers 16a, 16b can hold the sheet 25 pulled out from the roll sheet 21 attached to the supply roller 12.

[0035] A fixed roller 18 is provided below the guide roller 16a. The width of the fixed roller 18 is wider than the width of the sheet 25. The fixed roller 18 is subjected to a surface treatment to prevent an adhesive layer from adhering thereto.

[0036] A pair of pull-out rollers 20a, 20b, each extending in the left-right direction, are provided behind and above the holding table 6, close to each other. The width of each of the pull-out rollers 20a, 20b is wider than the width of the sheet 25. Of the pair of pull-out rollers 20a, 20b, the lower pull-out roller 20b is surface-treated to prevent the adhesive layer from adhering thereto. The pair of guide rollers 16a, 16b can hold the sheet 25 pulled out from the roll sheet 21 attached to the supply roller 12.

[0037] Furthermore, the pair of pull-out rollers 20a, 20b are connected to a motor 22 for applying a force to the rolled sheet 21 to pull out the sheet 25 from the rolled sheet 21 attached to the supply roller 12. Specifically, when the motor 22 is operated with the pair of pull-out rollers 20a, 20b holding the sheet 25, the pair of pull-out rollers 20a, 20b rotate, and the rolled sheet 21 can be rotated together with the supply roller 12 so as to further pull out the sheet 25.

[0038] A collection roller 24 extending in the left-right direction is provided above the pair of pull-out rollers 20a, 20b. The width of the collection roller 24 is wider than the width of the sheet 25. The collection roller 24 is connected to a motor 26 for rotating the collection roller 24 to collect the sheet 25 sent out from the pair of pull-out rollers 20a, 20b. Specifically, when the motor 26 is operated with the leading end of the sheet 25 fixed to the collection roller 24, the portion of the sheet 25 sent out from the pair of pull-out rollers 20a, 20b is wound around the collection roller 24 so as to be collected.

[0039] A pressure roller 28 is provided between the fixed roller 18 and the pair of pull-out rollers 20a, 20b. The width of the pressure roller 28 is wider than the width of the sheet 25. The pressure roller 28 is connected to an actuator 30 that moves the pressure roller 28 so as to circulate between a standby position, a sticking start position, and a sticking end position, which will be described later.

[0040] Specifically, the standby position is, for example, a position of the pressure roller 28 capable of clamping, together with the fixed roller 18, a portion of the sheet 25 that has been pulled out from the roll sheet 21 attached to the supply roller 12 and that has passed between the pair of guide rollers 16a, 16b. The sticking start position is, for example, a position of the pressure roller 28 capable of pressing the sheet 25 against the front end of the object 11 held on the holding surface of the holding table 6. The sticking end position is, for example, a position of the pressure roller 28 capable of pressing the sheet 25 against the rear end of the object 11 held on the holding surface of the holding table 6.

[0041] A sheet cutting mechanism 32 is provided directly above the table base 4 and the holding table 6. This sheet cutting mechanism 32 has a rotating plate 34 whose center is located directly above the center of the holding table 6. A protrusion 34a is provided at the center of the lower surface of this rotating plate 34, and a base end of an arm 36 having a length longer than the radius of the holding surface of the holding table 6 and shorter than the radius of the recess 4a formed in the table base 4 is fixed to the lower end of this protrusion 34a.

[0042] A cutter 38 is provided below the tip of the arm 36 and positioned directly above the gap between the side surface of the holding table 6 and the side surface of the recess 4a. Furthermore, the rotating plate 34 is connected to a moving mechanism 40. This moving mechanism 40 includes, for example, a motor and an air cylinder that can operate independently of each other.

[0043] When the motor is operated, the rotating plate 34 is rotated about a straight line that passes through the center and runs vertically as the axis of rotation, i.e., the cutter 38 can be rotated about this axis of rotation. When the air cylinder is operated with the object 11 held on the holding surface of the holding table 6, the lower end of the cutter 38 can be positioned in the gap between the side surface of the holding table 6 and the side surface of the recess 4a without the arm 36 coming into contact with the object 11.

[0044] Furthermore, the bonding device 2 is provided with an output device 42 for notifying the operator of various information. This output device 42 is, for example, a display, and is capable of displaying a message indicating that the roll sheet 21 has reached its usage limit. The output device 42 may include a printer, a speaker, or the like in addition to or instead of a display.

[0045] The components of the adhering device 2 described above are controlled by a controller 44. The controller 44 includes a processor and a memory. The processor is, for example, configured with a CPU (Central Processing Unit) or the like. The memory is, for example, configured with a volatile memory such as a DRAM (Dynamic Random Access Memory) or an SRAM (Static Random Access Memory), and a non-volatile memory such as an SSD (Solid State Drive) (NAND type flash memory) or an HDD (Hard Disk Drive) (magnetic storage device).

[0046] The memory stores various information (data, programs, etc.) used by the processor. For example, the memory stores a threshold value of a physical quantity using the torque of the motor 22 as a parameter to be used in determining whether the rolled sheet 21 has reached its usage limit. An example of this physical quantity is the current value of the motor 22. Alternatively, this physical quantity may be the voltage value or the number of rotations of the motor 22. In addition, if this determination is made after the outer diameter of the rolled sheet 21 becomes smaller than a predetermined value, the predetermined value may be stored in the memory.

[0047] The processor also controls the components of the adhering device 2 to read from the memory and execute various programs for adhering the multiple adhering portions 25a included in the sheet 25 to the multiple substrates 11, respectively, until the rolled sheet 21 reaches its usage limit. In this case, the processor determines whether the rolled sheet 21 has reached its usage limit by comparing a physical quantity, the parameter of which is the torque of the motor 22 when the motor 22 is operated, with a threshold value.

[0048] Fig. 4 is a flow chart showing a typical example of a sticking method in which a plurality of sticking portions 25a included in a sheet 25 are stuck to a plurality of objects 11 in the sticking device 2. In this method, first, a rolled sheet 21 having a core 23 and a sheet 25 whose end is fixed to the core 23 is attached to a supply roller 12 (attaching step S1). Fig. 5 is a schematic perspective view of the sticking device 2 after the attachment step S1 has been carried out.

[0049] In this mounting step S1, first, the core 23 is placed over the supply roller 12 so that the adhesive layer 25c of the sheet 25 being pulled downward faces forward. Then, the leading end of the sheet 25 pulled out from the roll sheet 21 passes between the pair of guide rollers 16a, 16b, between the fixed roller 18 and the pressure roller 28, and between the pair of pull-out rollers 20a, 20b, and is then fixed to the recovery roller 24.

[0050] This completes the attachment step S1. After the attachment step S1, the multiple attachment parts 25a are attached to the multiple attachment targets 11, respectively, until it is determined that the roll sheet 21 has reached its usage limit (attachment step S2).

[0051] Fig. 6 is a flow chart showing an example of the adhering step S2. In the adhering step S2, first, one of the plurality of objects 11 is carried into the holding table 6 (carrying-in step S21). Fig. 7 is a perspective view showing the carrying-in step S21.

[0052] In this carry-in step S21, first, any one of the plurality of objects to be bonded 11 is placed on the holding table 6 so that the center of the back surface 11b of the object to be bonded is brought into contact with the center of the holding surface of the holding table 6. Next, the suction source included in the pressure adjustment mechanism 8 is operated so that the object to be bonded 11 is held on the holding surface of the holding table 6. This completes the carry-in step S21.

[0053] After the carry-in step S21, the motor 22 is operated to apply a force to the rolled sheet 21 so as to pull out the sheet 25 from the rolled sheet 21 (operation step S22). Fig. 8 is a perspective view showing a schematic view of the operation step S22.

[0054] In this operation step S22, the motor 22 is operated to rotate the pair of pull-out rollers 20a, 20b, etc., until the flexure of the sheet 25 that occurred in the installation step S1 is eliminated. Specifically, in this operation step S22, the motor 22 is operated until a physical quantity having the torque of the motor 22 as a parameter is maintained at a substantially constant value during the operation of the motor 22.

[0055] The threshold value stored in the memory of the controller 44 is set to be, for example, 1.2 to 3 times (typically 1.5 times) larger than the fixed value. Also, the motor 26 is operated so that the portion of the sheet 25 sent out from the pair of pull-out rollers 20a, 20b is wound around the collection roller 24 and collected. This completes the operation step S22.

[0056] If the outer diameter of the rolled sheet 21 detected by the sensor 14 in the operation step S22 is greater than a predetermined value (first determination step S23: NO), one of the multiple adhesion portions 25a included in the sheet 25 is adhered to the object 11 carried into the holding table 6 and separated from the sheet 25 (processing step S24). Fig. 9 is a perspective view that shows a schematic view of the processing step S24.

[0057] In this processing step S24, first, the pressing roller 28 is moved so that it is positioned in the above-mentioned standby position, adhesion start position, and adhesion end position in that order. As a result, the sheet 25 is pressed against the surface 11a side of the attachment target 11, and the attachment portion 25a included in this sheet 25 is attached to the surface 11a side of the attachment target 11.

[0058] Next, the sheet cutting mechanism 32 is lowered until the cutter 38 penetrates the sheet 25, that is, until the cutter 38 is positioned in the gap between the side surface of the holding table 6 and the side surface of the recess 4a. Next, the rotating plate 34 is rotated at least once to rotate the cutter 38. In this case, the adhesive portion 25a included in the sheet 25 is cut out to form an opening, and the adhesive portion 25a is separated from the sheet 25. This completes the processing step S24.

[0059] After the processing step S24, the object 11 to which the adhering part 25a is attached is carried out from the holding table 6 (carrying out step S25). In this carrying out step S25, first, the operation of the suction source of the pressure adjustment mechanism 8 is stopped so that the object 11 is simply placed on the holding table 6, and the air supply source is operated. Then, the object 11 to which the adhering part 25a is attached is carried out from the holding table 6. This completes the carrying out step S25.

[0060] After the unloading step S25, the above-mentioned loading step S21 and operation step S22 are performed again. In the operation step S22, for example, the motor 22 is operated until the portion of the sheet 25 surrounding the opening formed in the processing step S24 is sent out from the pair of pull-out rollers 20a, 20b.

[0061] Furthermore, if the outer diameter of the rolled sheet 21 sensed by the sensor 14 in the operation step S22 is greater than a predetermined value (first determination step S23: NO), the above-mentioned processing step S24, carrying-out step S25, carrying-in step S21, and operation step S22 are repeated.

[0062] On the other hand, if the outer diameter is smaller than a predetermined value (first judgment step S23: YES), the processor compares a physical quantity having the torque of the motor 22 as a parameter (here, the current value of the motor 22) with a threshold value stored in the memory of the controller 44 to determine whether the roll sheet 21 has reached its usage limit.

[0063] Specifically, if the actual current value of the motor 22 in the operation step S22 is smaller than the threshold value (second determination step S26: NO), the processor determines that the rolled sheet 21 has not reached its usage limit. In this case, the above-mentioned processing step S24, unloading step S25, loading step S21, and operation step S22 are repeated.

[0064] On the other hand, if the actual current value of the motor 22 is greater than the threshold value (second determination step S26: YES), the processor of the controller 44 determines that the rolled sheet 21 has reached its usage limit. Then, to notify an operator that the rolled sheet 21 has reached its usage limit, the processor controls the output device 42 to display a message to that effect, for example.

[0065] In the bonding device 2, it is determined whether the roll sheet 21 has reached its usage limit by comparing the actual value of a physical quantity, the parameter of which is the torque of the motor 22 for applying a force to the roll sheet 21 such as to pull the sheet 25 from the roll sheet 21 attached to the supply roller 12, with a threshold value.

[0066] Here, this torque changes suddenly at the timing when the vicinity of the trailing edge of the sheet 25 is pulled out from the core. That is, in the roll sheet 21 in which the trailing edge of the sheet 25 is fixed to the core 23, the torque increases suddenly at this timing.

[0067] Therefore, in the application device 2, it can be determined that the rolled sheet 21 has reached its usage limit at the timing when the entire sheet 25 is pulled out from the rolled sheet 21. As a result, in the application device 2, it is possible to effectively utilize the rolled sheet 21 that is used when applying the multiple application portions 25a included in the sheet 25 to the multiple objects 11, respectively.

[0068] The above-mentioned contents are merely examples of the present invention, and the present invention is not limited to the above-mentioned contents. For example, instead of the holding table 6, the sticking device 2 may be provided with a table that does not include a mechanism for applying a suction force to the sticking target 11, that is, a table that simply supports the sticking target 11.

[0069] Furthermore, the roll sheet 21 may have, instead of the sheet 25, a sheet including a plurality of attachment parts each formed in advance into a shape corresponding to the substrate 11. In this case, the sheet has, for example, a release paper whose width is longer than the substrate 11 and whose length is an order of magnitude longer than the width, and a plurality of attachment parts each including an adhesive layer and a base material located on the release paper side. Furthermore, in this case, the attachment device 2 may be provided with, instead of the processing unit 10, a processing unit capable of peeling each of the plurality of attachment parts from the release paper and attaching them to the substrate 11.

[0070] Alternatively, the roll sheet 21 may have a sheet including only the base material 25b without the adhesive layer 25c, instead of the sheet 25. In this case, the adhesion device 2 may be provided with a processing unit, instead of the processing unit 10, that presses the sheet against the adhesion target 11 while heating it, i.e., adheres the sheet by thermocompression bonding, and is capable of cutting out the portion of the sheet that is adhered to the adhesion target 11 (adhered portion) from the sheet.

[0071] In addition, in the roll sheet 21, the end of the sheet 25 does not have to be fixed to the core 23. In this case, the torque of the motor 22 used to determine whether the roll sheet 21 has reached its usage limit is suddenly reduced when the vicinity of the end of the sheet 25 is pulled out from the core. Therefore, in this case, the threshold value stored in the memory of the controller 44 is set to be smaller than the torque when the sheet 25 is pulled out from the roll sheet 21.

[0072] Also, the adhering device 2 may not be provided with the sensor 14. In this case, the adhering device 2 may estimate the outer diameter of the rolled sheet 21 by, for example, referring to the number of rotations of the pull-out rollers 20a, 20b. Alternatively, in this case, a determination as to whether the rolled sheet 21 has reached its usage limit may be performed throughout the entire period when the multiple adhering portions 25a included in the sheet 25 are adhered to the multiple objects 11. That is, in the adhering step S2, the first determination step S23 may be omitted, and the second determination step S26 may be necessarily performed in conjunction with the operation step S22.

[0073] In addition, in the pasting step S2, the timing of performing the operation step S22 and the first determination step S23 and / or the second determination step S26 performed in conjunction therewith is not limited. For example, the operation step S22, etc. may be performed after the processing step S24 and before the carry-out step S25. Alternatively, the operation step S22, etc. may be performed after the carry-out step S25 and before the carry-in step S21.

[0074] Furthermore, the actuation step S22 may be performed by any method that can impart a force to the rolled sheet 21 such that the sheet 25 can be pulled out from the rolled sheet 21. For example, the actuation step S22 may be performed by moving a gripping portion in the horizontal and / or vertical direction while both ends in the width direction of the sheet 25 are gripped by the gripping portion.

[0075] Furthermore, processing step S24 may be performed by any method as long as the multiple adhesion portions 25a included in the sheet 25 can be adhered to the multiple substrates 11, respectively. For example, processing step S24 may be performed by moving the holding table 6 in the horizontal and / or vertical directions so as to press the substrates 11 held on the holding surface of the holding table 6 against the adhesion portions 25a.

[0076] Alternatively, processing step S24 may be performed by contacting the adhesive portion 25a with the object to be attached 11 held on the holding surface of the holding table 6, and creating an air pressure difference between the space on the front side 11a of the sheet 25 and the space on the back side 11b thereof, so that the adhesive portion 25a is pressed against the object to be attached 11.

[0077] In addition, the structures and methods according to the above-described embodiments can be modified as appropriate without departing from the scope of the present invention. [Explanation of symbols]

[0078] 2: Pasting device 4: Table base (4a: recess) 6: Holding table (6a: frame, 6b: porous plate) 8: Pressure adjustment mechanism 10: Processing unit 11: Object to be adhered (11a: front side, 11b: back side) 12: Supply roller 13: Planned division line 14: Sensor 15: Device 16a, 16b: Guide rollers 18: Fixed roller 20a, 20b: pull-out rollers 21: Roll sheet 22: Motor 23: Core 24: Collection roller 25: Sheet (25a: Adhesive part, 25b: Base material, 25c: Adhesive layer) 26: Motor 28: Pressure roller 30: Actuator 32: Sheet cutting mechanism 34: Rotating plate (34a: protruding portion) 36: Arm 38: Cutter 40: Movement mechanism 42: Output device 44: Controller

Claims

1. A sticking device for sticking a plurality of sticking portions included in a sheet to a plurality of objects, comprising: a table for supporting any one of the plurality of objects to be adhered; a processing unit for attaching any one of the plurality of attachment portions to any one of the plurality of attachment targets supported by the table and separating the attachment portion from the sheet; A controller for controlling the processing unit, The processing unit comprises: a supply roller on which a roll sheet obtained by winding the sheet around a cylindrical core is mounted; a motor for applying a force to the rolled sheet so as to pull the sheet from the rolled sheet attached to the supply roller; The controller a memory for storing a threshold value of a physical quantity having a torque of the motor as a parameter; a processor for determining whether the roll sheet has reached a usage limit by comparing an actual value of the physical quantity when the motor is operated with the threshold value.

2. The ends of the sheet are secured to the core; 2. The bonding device according to claim 1, wherein the processor determines that the roll sheet has reached its usage limit when the actual value of the physical quantity is greater than the threshold value.

3. The ends of the sheet are not secured to the core; 2. The bonding device according to claim 1, wherein the processor determines that the roll sheet has reached its usage limit when the actual value of the physical quantity is smaller than the threshold value.

4. the processing unit further includes a sensor for detecting when the outer diameter of the roll sheet attached to the supply roller becomes smaller than a predetermined value; 4. The bonding device according to claim 1, wherein the processor begins to determine whether the roll sheet has reached its limit of use after the sensor detects that the outer diameter of the roll sheet has become smaller than the predetermined value.

5. A method for attaching a plurality of attachment portions included in a sheet to a plurality of objects, the method comprising the steps of: a mounting step of mounting a roll sheet obtained by winding the sheet around a cylindrical core onto a supply roller; and a sticking step of sticking the sticking portions to the plurality of objects until it is determined that the roll sheet attached to the supply roller has reached its usage limit, after the mounting step. The bonding step includes: a carrying step of carrying one of the plurality of objects to be adhered onto a table for supporting the one of the plurality of objects to be adhered; an operating step of operating a motor for applying a force to the rolled sheet so as to pull the sheet from the rolled sheet attached to the supply roller; a processing step of attaching any one of the plurality of attachment portions included in the sheet pulled out from the roll sheet attached to the supply roller to any one of the plurality of attachment targets supported by the table and separating the attachment portion from the sheet; a carrying-out step of carrying out from the table any one of the plurality of objects to which any one of the plurality of adhering portions is attached; This is done by repeating the In this bonding method, the judgment as to whether the roll sheet has reached its usage limit is made by comparing an actual value of a physical quantity, the parameter of which is the torque of the motor in the operating step, with a threshold value.

6. The ends of the sheet are secured to the core; 6. The method according to claim 5, wherein the roll sheet is judged to have reached its limit of use when the actual value of the physical quantity is greater than the threshold value.

7. The ends of the sheet are not secured to the core; 6. The method according to claim 5, wherein the roll sheet is judged to have reached its limit of use when the actual value of the physical quantity is smaller than the threshold value.

8. 8. The bonding method according to claim 5, wherein the determination as to whether the rolled sheet has reached its limit of use is started after the outer diameter of the rolled sheet attached to the supply roller becomes smaller than a predetermined value.

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