WO2019155965A1 - ワイヤボンディング装置 - Google Patents
ワイヤボンディング装置 Download PDFInfo
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- WO2019155965A1 WO2019155965A1 PCT/JP2019/003214 JP2019003214W WO2019155965A1 WO 2019155965 A1 WO2019155965 A1 WO 2019155965A1 JP 2019003214 W JP2019003214 W JP 2019003214W WO 2019155965 A1 WO2019155965 A1 WO 2019155965A1
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- WIPO (PCT)
- Prior art keywords
- load
- pressing
- leaf spring
- calibration
- wire bonding
- Prior art date
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
- H01L24/74—Apparatus for manufacturing arrangements for connecting or disconnecting semiconductor or solid-state bodies
- H01L24/78—Apparatus for connecting with wire connectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/74—Apparatus for manufacturing arrangements for connecting or disconnecting semiconductor or solid-state bodies and for methods related thereto
- H01L2224/78—Apparatus for connecting with wire connectors
- H01L2224/7825—Means for applying energy, e.g. heating means
- H01L2224/78251—Means for applying energy, e.g. heating means in the lower part of the bonding apparatus, e.g. in the apparatus chuck
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/74—Apparatus for manufacturing arrangements for connecting or disconnecting semiconductor or solid-state bodies and for methods related thereto
- H01L2224/78—Apparatus for connecting with wire connectors
- H01L2224/7825—Means for applying energy, e.g. heating means
- H01L2224/783—Means for applying energy, e.g. heating means by means of pressure
- H01L2224/78343—Means for applying energy, e.g. heating means by means of pressure by ultrasonic vibrations
- H01L2224/78353—Ultrasonic horns
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/74—Apparatus for manufacturing arrangements for connecting or disconnecting semiconductor or solid-state bodies and for methods related thereto
- H01L2224/78—Apparatus for connecting with wire connectors
- H01L2224/789—Means for monitoring the connection process
- H01L2224/7892—Load or pressure adjusting means, e.g. sensors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
- H01L2224/85—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a wire connector
- H01L2224/859—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a wire connector involving monitoring, e.g. feedback loop
Definitions
- the present disclosure relates to a wire bonding apparatus.
- Patent Document 1 discloses a wire bonding apparatus.
- the wire bonding apparatus includes a bonding tool, a drive source, and a control unit.
- the bonding tool bonds the wires while pressing the wires against the electrodes in a predetermined bonding area.
- the drive source drives the bonding tool along the vertical direction.
- the control unit controls the pressing load of the bonding tool.
- the pressing load of the bonding tool provided in the wire bonding apparatus may change with time due to, for example, continuous operation for a certain period. For this reason, in order for the bonding tool with which a wire bonding apparatus is provided to aim at maintenance of a suitable press load, calibration of a press load is performed regularly.
- the calibration work of the pressing load of the bonding tool is performed by an operator.
- This calibration work is performed using, for example, a load cell that is installed in the bonding area with the wire bonding apparatus stopped.
- at least the time required for attaching and detaching the load cell and the time required for the operator to calibrate the pressing load are required as the period for stopping the wire bonding apparatus.
- performing the calibration operation can reduce the productivity of the wire bonding apparatus.
- the present disclosure describes a bonding apparatus that can achieve both improvement in productivity and calibration of the pressing load of the bonding tool.
- a wire bonding apparatus is a wire bonding apparatus including a bonding tool that bonds a wire while pressing the wire against an electrode in a predetermined bonding area, and a driving source that drives the bonding tool in the vertical direction; A control unit that is connected to the driving source and controls the pressing load of the bonding tool, an elastic unit that is arranged outside the bonding area and generates distortion due to the pressing load, an acquisition unit that acquires distortion of the elastic unit, and an acquisition unit And a calibration unit that performs a calibration process of the control unit so that a load error between a preset target value of the pressing load and an actual measurement value of the pressing load falls within a predetermined range based on the obtained result.
- the wire bonding apparatus causes the elastic portion to be distorted by pressing the elastic portion with a bonding tool.
- the wire bonding apparatus performs the calibration process of the control unit by the calibration unit. This calibration process is performed so that the load error between the preset target value of the pressing load and the actually measured value of the pressing load is within a predetermined range based on the acquisition result of the distortion of the elastic portion acquired by the acquiring unit. Controls the pressing force of the tool.
- the elastic portion is disposed outside the bonding area. As a result, compared to, for example, a case where a load cell is attached in the bonding area, the stop time of the wire bonding apparatus for performing the calibration process can be shortened. Therefore, the operation time of the wire bonding apparatus can be increased. As a result, the wire bonding apparatus can achieve both improvement in productivity and calibration of the pressing load of the bonding tool.
- the calibration processing is performed so that the first load of the elastic portion in a non-pressing state in which the bonding tool is not pressing the elastic portion, and the pressing load is set to the target value by the control portion.
- a measurement process for calculating an actual measurement value of the pressing load based on the second strain of the elastic part in a pressing state in which the bonding tool presses the elastic part with the pressing load when the bonding tool is controlled The load error is calculated from the measured value obtained and the target value of the pressing load, and the comparison process for comparing the load error with a preset load threshold, and when the load error is equal to or greater than the load threshold, the load error is reduced.
- the calibration unit repeats the actual measurement process, the comparison process, and the correction process until the load error becomes less than the load threshold value. It may be.
- the measured value of the pressing load is calculated according to the second strain in the pressed state with the first strain in the non-pressed state as a reference. Therefore, for example, the reference is less likely to vary than when the actual measurement value of the pressing load is calculated according to the displacement of the elastic portion. As a result, the actual measurement value of the pressing load can be calculated with high accuracy. Therefore, the calibration process can be performed with high accuracy.
- the elastic portion is a leaf spring supported in a cantilever shape
- the acquisition portion includes a first strain gauge provided on the upper surface of the leaf spring, and a leaf spring. And a second strain gauge provided on the lower surface.
- the configuration of the elastic portion can be made small and simple. Therefore, space saving of the wire bonding apparatus can be achieved.
- the 1st strain gauge and the 2nd strain gauge are provided in both surfaces of the leaf
- the elastic portion is supported in a cantilever shape, and has a rigidity lower than that of the one end and the other end in an intermediate portion sandwiched between the one end and the other end in the longitudinal direction.
- the acquisition section is provided on the upper and lower surfaces of the third strain gauge provided on the upper surface and the lower surface of one end portion of the beam material, and on the upper and lower surfaces of the other end portion of the beam material.
- a fourth strain gauge is provided in the intermediate part.
- the distortion of the beam material can be acquired with high sensitivity.
- a third strain gauge and a fourth strain gauge are provided on both surfaces of the beam material.
- the bonding apparatus according to the present disclosure can achieve both improvement in productivity and calibration of the pressing load of the bonding tool.
- FIG. 1 is a plan view of a wire bonding apparatus according to an embodiment of the present disclosure.
- FIG. 2 is a schematic configuration diagram showing a configuration example of the wire bonding apparatus of FIG.
- FIG. 3A is a perspective view of the leaf spring assembly of FIG.
- FIG. 3B is a plan view of the leaf spring assembly of FIG.
- FIG. 3C is a side view of the leaf spring assembly of FIG.
- FIG. 4A is a side view illustrating a non-pressed state of the leaf spring assembly of FIG.
- FIG. 4B is a side view illustrating the pressed state of the leaf spring assembly of FIG.
- FIG. 5 is a flowchart of an operation example of the wire bonding apparatus shown in FIG.
- FIG. 6 is a flowchart illustrating the calibration process. (A) of FIG.
- FIG. 7 is a side view of the modification of an elastic part.
- FIG. 7B is a side view illustrating a non-pressed state of the elastic portion of FIG.
- FIG. 7C is a side view illustrating the pressing state of the elastic portion in FIG.
- FIG. 8 is a side view showing another modification of the leaf spring assembly.
- FIG. 1 is a plan view of the wire bonding apparatus of the present disclosure.
- the wire bonding apparatus 100 includes a capillary 15 (bonding tool).
- the capillary 15 joins the wire to the electrode by pressing the wire against the electrode in a predetermined bonding area BA.
- the electrode includes an electrode of an electronic component 19 such as a semiconductor chip, an electrode of a substrate 18 to which the electronic component 19 is attached, and the like.
- the extending direction of the guide rail 16 is defined as the X direction.
- the horizontal direction orthogonal to the X direction is defined as the Y direction.
- a vertical direction perpendicular to the X direction and the Y direction is defined as a Z direction.
- the wire bonding apparatus 100 includes a frame 10, an XY table 11, a bonding head 12, a bonding arm 13, an ultrasonic horn 14, a capillary 15, a pair of guide rails 16, a heat block 17, and a leaf spring set.
- a solid 20 and a microcomputer 60 are provided.
- the XY table 11 is provided on the frame 10.
- the bonding head 12 is provided on the XY table 11.
- the bonding arm 13 is provided on the bonding head 12.
- the ultrasonic horn 14 is attached to the tip of the bonding arm 13.
- the capillary 15 is attached to the tip of the ultrasonic horn 14.
- the pair of guide rails 16 guide the substrate 18 along a predetermined horizontal direction.
- the heat block 17 heats the bonding area BA.
- the leaf spring assembly 20 is used for calibrating the pressing load of the capillary 15.
- the microcomputer 60 controls the entire operation of the wire bonding apparatus 100.
- the pressing load of the capillary 15 is a load that acts on the wire when the capillary 15 presses the wire against the electrode.
- the pressing load of the capillary 15 is a so-called bond load.
- the motor (drive source) 40 is provided inside the bonding head 12.
- the motor (drive source) 40 drives the bonding arm 13 in the Z direction.
- the motor 40 has a stator 41 and a mover 42.
- the stator 41 is fixed to the bonding head 12.
- the mover 42 rotates around a rotation shaft 45 extending along the X direction.
- Driving power is supplied from a power source 49 to the stator 41 of the motor 40.
- the current value supplied to the stator 41 is detected by the current sensor 51.
- the current value is adjusted by the motor driver 48.
- the mover 42 is integrated with the rear portion of the bonding arm 13. When the mover 42 rotates, the tip of the bonding arm 13 swings along the Z direction.
- An angle sensor 52 that detects a rotation angle ⁇ of the mover 42 is attached to the rotation shaft 45 of the mover 42.
- the Z direction position (height) of the rotation center 43 of the rotation shaft 45 of the mover 42 is substantially the same as the Z direction position of the bonding surface.
- the rotation center 43 is an intersection of the one-dot chain line 46 and the one-dot chain line 47 in FIG.
- the bonding surface is a surface indicated by an alternate long and short dash line 47 in FIG.
- the bonding surface is, for example, a virtual plane along the upper surface of the electrode of the electronic component 19 when the substrate 18 is positioned on the heat block 17.
- the flange 14b of the ultrasonic horn 14 is fixed to the tip of the bonding arm 13 with a bolt 14c.
- a recess 13 a is provided on the lower surface of the tip portion of the bonding arm 13.
- the recess 13 a accommodates the ultrasonic transducer 14 a of the ultrasonic horn 14.
- a capillary 15 is attached to the tip of the ultrasonic horn 14. Therefore, when the mover 42 rotates, the capillary 15 swings in the vertical direction in a substantially vertical direction with respect to the electrode surface of the electronic component 19 and the upper surface of the leaf spring 31. That is, the motor 40 drives the capillary 15 as a bonding tool along the vertical direction.
- the heat block 17 is attached between the pair of guide rails 16 on the frame 10.
- the heat block 17 has one or a plurality of heaters 17a.
- the heater 17a heats the bonding area BA (see FIG. 1) so that the temperature is suitable for bonding the wire while being pressed against the electrode by the capillary 15.
- a temperature sensor 53 is attached in the vicinity of the bonding head 12. The temperature sensor 53 detects a representative temperature of the wire bonding apparatus 100.
- the bonding area BA is a virtual area defined along, for example, the XY plane.
- the bonding area BA is an area on the heat block 17. In the region on the heat block 17, a temperature condition suitable for wire bonding is obtained by the heat provided from the heater 17 a of the heat block 17.
- the bonding area BA is, for example, a substantially rectangular area and is line symmetric with respect to an imaginary line along the extending direction of the bonding arm 13 in the X direction.
- the bonding area BA includes at least a part of the electronic components 19 arranged along the X direction when the substrate 18 is positioned on the heat block 17 in the X direction, for example.
- the bonding area BA includes all of the electronic components 19 arranged along the Y direction when the substrate 18 is located on the heat block 17 in the Y direction, for example.
- the microcomputer 60 includes a CPU [Central Processing Unit] that performs arithmetic and signal processing, a ROM [Read Only Memory], and a RAM [RAM Random Access Memory].
- the microcomputer 60 receives at least detection signals from the current sensor 51, the angle sensor 52, and the temperature sensor 53. Imaging information may be input to the microcomputer 60 from an imaging device (not shown) or the like.
- the ROM stores a program for operating the wire bonding apparatus 100 and data necessary for executing the program.
- the microcomputer 60 has a control unit 61.
- the controller 61 controls the motor 40 and the XY table 11 to perform the joining process.
- the bonding process includes, for example, a process for performing a bonding operation.
- the control unit 61 acquires position information of the substrate 18, the electronic component 19, and the electrode based on the input imaging information.
- the controller 61 operates the motor 40 and the XY table 11 by executing a bonding program stored in the memory. This operation is based on the detection signals of the sensors 51, 52, and 53, the acquired position information, the information on the type of the electronic component 19 and the pitch of the electrodes stored in advance in the memory, and the like.
- the controller 61 determines a command value of the current supplied to the stator 41 of the motor 40 as the joining process. Further, the control unit 61 outputs a current command value to the motor driver 48 as the joining process. The controller 61 controls the motor driver 48 so that the current value applied to the stator 41 becomes the current command value. As a result, the current value applied to the stator 41 is adjusted.
- the controller 61 controls the pressing load on the capillary 15. As a result, the wire is pressed against the electrode with a pressing load corresponding to the applied current. This pressing load may be, for example, a target value of the pressing load described later.
- the controller 61 vibrates the ultrasonic transducer 14a with the capillary 15 pressing the wire against the electrode with the pressing load. As a result, the wire pressed by the capillary 15 is joined to the electrode.
- the control unit 61 is connected to the XY table 11 (see FIGS. 1 and 2).
- the controller 61 outputs command values for the positions of the capillaries 15 in the X and Y directions to the XY table 11.
- the positions of the capillary 15 in the X direction and the Y direction are inside the capillary movable area CA (see FIG. 1).
- the controller 61 adjusts the position of the capillary 15 in the XY direction.
- the XY table 11 is driven so that the position of the capillary 15 in the XY direction becomes the commanded position.
- the capillary movable area CA is a virtual area defined along the bonding area BA, for example.
- the capillary movable area CA is wider than the bonding area BA.
- the capillary movable area CA extends widely to at least the bonding head 12 side of the heat block 17 with respect to the bonding area BA.
- the capillary movable area CA may include a bonding area BA.
- the microcomputer 60 includes a calibration unit 62 that performs the calibration process of the control unit 61. Details of the calibration process will be described later.
- the leaf spring assembly 20 is mounted on the frame 10 between the guide rail 16 on the bonding arm 13 side and the heat block 17.
- the leaf spring assembly 20 may include a cover for shielding heat from the heat block 17.
- the leaf spring assembly 20 includes a base 21, a support base 22, a flange 26, and a leaf spring (elastic portion) 31.
- the shape of the base 21 is a square flat plate.
- the support base 22 protrudes in the Z direction at the upper end portion of the base 21.
- the flange 26 protrudes in the Y direction at the lower end portion of the base 21.
- the leaf spring (elastic portion) 31 is fixed to the upper end surface of the support base 22 with a bolt 25 via a pressing plate 25a.
- a bolt hole 27 is provided in the flange 26. The bolt holes 27 are for fixing the leaf spring assembly 20 to the frame 10 with bolts.
- the leaf spring 31 is a metal thin plate, for example.
- a base end portion 31 a of the leaf spring 31 is fixed to the upper end surface of the support base 22.
- the leaf spring 31 is supported in a cantilever shape.
- the leaf spring 31 extends along the XY plane so that the tip 31b protrudes from the upper end surface of the support base 22 toward the bonding arm 13 side.
- the leaf spring 31 is distorted by the pressing load of the capillary 15.
- the leaf spring 31 is disposed outside the bonding area BA.
- the leaf spring 31 is disposed between the outer edge of the bonding area BA and the outer edge of the capillary movable area CA.
- the leaf spring 31 is arranged inside the outer edge of the capillary movable area CA.
- the leaf spring 31 is arranged so as to extend along the outer edge of the bonding area BA extending to the bonding head 12 side of the heat block 17.
- the leaf spring 31 is disposed at a position where the capillary 15 can be easily reached by driving the XY table 11.
- the position (height) in the Z direction of the upper surface 31c of the leaf spring 31 is, for example, substantially the same as the Z direction position of the bonding surface described above.
- the bonding surface is indicated by a dashed line 47 in FIG.
- the upper surface 31 c of the leaf spring 31 has a pressing point P for causing a certain distortion of the leaf spring 31 with respect to a certain pressing load of the capillary 15, for example.
- a strain gauge portion 54 (first strain gauge) is provided on the upper surface 31 c of the leaf spring 31.
- a strain gauge portion 55 is provided on the lower surface 31 d of the leaf spring 31.
- the strain gauge unit 54 and the strain gauge unit 55 acquire the strain of the leaf spring 31 generated by the pressing load of the capillary 15. Detection signals from the strain gauge portions 54 and 55 are input to the microcomputer 60.
- the position where the strain gauge portion 54 is provided does not overlap with the upper end surface of the support base 22 on the base end portion 31 a side of the upper surface 31 c of the leaf spring 31.
- the strain gauge portion 54 acquires strain generated along the upper surface 31 c on the base end portion 31 a side of the leaf spring 31.
- the strain gauge portion 54 includes, for example, two strain gauges 54 a and a strain gauge 54 b arranged in parallel in the width direction of the leaf spring 31.
- the position where the strain gauge portion 55 is provided does not overlap with the upper end surface of the support base 22 on the base end portion 31a side of the lower surface 31d of the leaf spring 31.
- the strain gauge portion (second strain gauge) 55 acquires strain generated along the lower surface 31 d on the base end portion 31 a side of the leaf spring 31.
- the strain gauge portion 55 includes, for example, two strain gauges 55 a and a strain gauge 55 b arranged in parallel in the width direction of the leaf spring 31.
- the strain gauge 54a and the strain gauge 55a are attached to positions corresponding to each other across the leaf spring 31 on the upper surface 31c and the lower surface 31d, respectively.
- the strain gauge 54b and the strain gauge 55b are attached to positions corresponding to each other across the leaf spring 31 on the upper surface 31c and the lower surface 31d, respectively.
- As the strain gauges 54a, 54b, 55a, and 55b for example, piezoelectric type strain sensors can be used.
- the calibration unit 62 performs the calibration process of the control unit 61. This calibration process is based on the acquisition results of the strain gauge portions 54 and 55. According to this calibration process, the load error between the target value of the pressing load and the measured value of the pressing load is within a predetermined range.
- the calibration process of the calibration unit 62 will be described in detail.
- the calibration unit 62 performs actual measurement processing, comparison processing, and correction processing described below as an example of calibration processing.
- the calibration unit 62 repeats the calibration process until the load error becomes less than a preset load threshold.
- the load error is an error in the actual measurement value of the pressing load with respect to the target value of the pressing load.
- the target value of the pressing load is an appropriate pressing load for bonding while pressing the wire against the electrode with the capillary 15.
- the target value of the pressing load is a preset pressing load of the capillary 15.
- the target value of the pressing load may be a predetermined value of pressing load.
- the target value of the pressing load may be a pressing load within a predetermined range including a certain allowable width from the predetermined value.
- the target value of the pressing load may be stored in advance in the calibration unit 62.
- the calibration unit 62 executes a calibration process program stored in the memory before the actual measurement process.
- the motor 40 and the XY table 11 operate.
- the capillary 15 moves outside the bonding area BA.
- the control unit 61 controls the motor 40 in the actual measurement process.
- the capillary 15 presses the pressing point P of the leaf spring 31.
- the calibration unit 62 calculates the actual value of the pressing load as the actual measurement process. This actual measurement processing is based on detection signals from the strain gauge unit 54 and the strain gauge unit 55. Specifically, the calibration unit 62 calculates a measured value of the pressing load by a known method.
- the well-known method is a method using a bridge circuit including a strain gauge portion 54 and a strain gauge portion 55, for example.
- the calculation of the actual measurement value is based on the acquired results of the strain gauge portion 54 and the strain gauge portion 55 and the physical property values such as the mass and elastic modulus of the leaf spring 31 stored in advance.
- the calibration unit 62 has a function as a detection circuit (amplifier) that detects distortion of the leaf spring 31.
- the function of the calibration unit 62 is based on detection signals from the strain gauges 54a, 54b, 55a, and 55b.
- the actual measurement value of the pressing load is the pressing load of the capillary 15.
- the pressing load of the capillary 15 is calculated based on the strain of the leaf spring 31 acquired by the strain gauge portions 54 and 55.
- the 4A is a side view illustrating the non-pressed state of the leaf spring assembly of FIG.
- the calibration unit 62 acquires the first distortion of the leaf spring 31 that is in a non-pressed state.
- the non-pressed state is a state where the capillary 15 is not pressing the leaf spring 31, for example.
- the non-pressed state is a state where the capillary 15 and the leaf spring 31 are separated from each other.
- the first strain is, for example, a strain generated in the leaf spring 31 when the weight of the leaf spring 31 acts as a point load on the pressing point P.
- the calibration unit 62 calculates the first actually measured load based on the first strain.
- the first actually measured load is a standard for calculating the actually measured value of the pressing load.
- FIG. 4B is a side view illustrating the pressed state of the leaf spring assembly of FIG.
- the calibration unit 62 acquires the second distortion of the leaf spring 31 that is in a pressed state.
- the pressed state is, for example, a state where the capillary 15 presses the pressing point P of the leaf spring 31 with a pressing load.
- the pressing load provided to the capillary 15 is controlled by the control unit 61 so as to be a target value.
- the pressing load of the capillary 15 is controlled by the control unit 61 so that the pressing load becomes a target value.
- the second strain is a strain generated in the leaf spring 31.
- the calibration unit 62 calculates the second actually measured load based on the second strain.
- the second actually measured load includes the pressing load of the capillary 15 and the weight of the leaf spring 31.
- the calibration unit 62 subtracts the first actual load from the second actual load. As a result, the third actually measured load is calculated.
- the third actually measured load is a substantial value of the pressing load of the capillary 15 excluding the weight of the leaf spring 31.
- the first actually measured load When the first actually measured load corresponding to the weight of the leaf spring 31 is sufficiently small with respect to the second actually measured load and can be ignored, the first actually measured load may be set to zero in the calculation of the second actually measured load. In this case, the calculation of the first actual load described above may be omitted, and the second actual load may be used as the third actual load.
- the calibration unit 62 calculates a load error using the third actually measured load and the target value of the pressing load as a comparison process. Further, the calibration unit 62 compares the calculated load error (for example, absolute value) with a preset load threshold value.
- the load threshold defines an allowable range of load error for determining completion of the calibration process of the control unit 61.
- the load threshold value may be stored in the calibration unit 62 in advance.
- the calibration unit 62 changes the command value (control data) of the current of the motor 40 in the control unit 61 so that the load error is reduced when the load error is equal to or greater than the load threshold. Specifically, the calibration unit 62 determines that the motor in the control unit 61 reduces the third actually measured load when the load error is equal to or greater than the load threshold and the third actually measured load is larger than the target value of the pressing load. Reduce the command value of 40 currents. In this case, the calibration unit 62 may reduce the command value of the current of the motor 40 step by step for each predetermined value. According to the operation of the calibration unit 62, the calibration process can be repeated a plurality of times until the load error becomes less than the load threshold.
- the calibration unit 62 instructs the current of the motor 40 in the control unit 61 so that the third actually measured load becomes large. Increase the value.
- the calibration unit 62 may increase the command value of the current of the motor 40 step by step for each predetermined value. According to the operation of the calibration unit 62, the calibration process can be repeated a plurality of times until the load error becomes less than the load threshold.
- FIG. 5 is a flowchart of an operation example of the wire bonding apparatus shown in FIG.
- FIG. 6 is a flowchart illustrating the calibration process.
- the microcomputer 60 starts the wire bonding apparatus 100 (step S10).
- step S ⁇ b> 10 the wire bonding apparatus 100 operates the heater 17 a of the heat block 17. Thereafter, the wire bonding apparatus 100 stands by until the temperature of the heat block 17 rises to a predetermined temperature. That is, the wire bonding apparatus 100 warms up (step S11).
- the microcomputer 60 performs the above-described bonding process (bonding) (step S12).
- the control unit 61 controls the pressing load of the capillary 15 so that the pressing load for pressing the wire against the electrode becomes a target value.
- the controller 61 vibrates the ultrasonic transducer 14a in a state where the capillary 15 presses the wire against the electrode. As a result, the wire pressed by the capillary 15 is joined to the electrode.
- the wire bonding apparatus 100 operates continuously so that the bonding process is repeatedly performed.
- the calibration unit 62 of the microcomputer 60 determines whether or not a calibration execution condition that is a condition for performing the calibration process of the control unit 61 is satisfied (step S13).
- the calibration execution condition in step S13 may be, for example, whether or not the wire bonding apparatus 100 has continuously performed a bonding process for a predetermined period such as 1000 hours.
- step S13 when the calibration unit 62 determines that the calibration execution condition is not satisfied, the process proceeds to step S15. Then, the microcomputer 60 determines whether or not to stop the operation of the wire bonding apparatus 100 (step S15). In step S15, when the calibration unit 62 determines not to stop the operation of the wire bonding apparatus 100, the process returns to step S12. Then, the microcomputer 60 continues the joining process.
- step S15 when the calibration unit 62 determines to stop the operation of the wire bonding apparatus 100, the microcomputer 60 stops the wire bonding apparatus 100. That is, the microcomputer 60 stops the operation of the program.
- step S14 when the calibration unit 62 determines in step S13 that the calibration execution condition is satisfied, the calibration unit 62 performs a calibration process (step S14).
- FIG. 6 shows a specific example of the calibration process in step S14.
- the calibration unit 62 maintains the operating state of the heater 17 a and operates the XY table 11. As a result of this operation, the capillary 15 moves outside the bonding area BA (step S20). In step S ⁇ b> 20, the capillary 15 moves above the pressing point P of the leaf spring 31. In the non-pressed state, the leaf spring 31 has a first distortion.
- the calibration part 62 acquires the 1st distortion of the leaf
- the calibration unit 62 applies a current corresponding to the target value of the pressing load at the current time to the motor 40.
- the leaf spring 31 is pressed with the pressing load by the capillary 15 (step S22).
- the leaf spring 31 generates the second distortion.
- the calibration part 62 acquires the 2nd distortion of the leaf
- the calibration unit 62 reduces the current applied to the motor 40. As a result, the pressing of the leaf spring 31 by the capillary 15 is released (step S24).
- the calibration unit 62 calculates the actual measurement value of the pressing load based on the first strain and the second strain (step S25).
- step S25 the first actually measured load and the second actually measured load are calculated.
- step S25 a third actually measured load is calculated from the first actually measured load and the second actually measured load. Steps S21 to S25 described above correspond to the actual measurement process.
- the calibration unit 62 calculates a load error based on the third actually measured load and the target value of the pressing load. Further, the calibration unit 62 compares the calculated absolute value of the load error with a preset load threshold value. According to this comparison, it is determined whether or not the absolute value of the load error is less than the load threshold (step S26). This step S26 corresponds to a comparison process.
- step S26 when it is determined that the absolute value of the load error is equal to or greater than the load threshold (step S26: NO), the measured value of the pressing load is deviated from the target value of the pressing load. Therefore, it is necessary to calibrate the pressing load. Therefore, the calibration unit 62 changes the command value of the current of the motor 40 in the control unit 61 so that the load error becomes small (step S27). This step S27 corresponds to a correction process. After step S27, the process returns to step S21. Then, actual measurement processing is performed.
- step S26 If it is determined in step S26 that the absolute value of the load error is less than the load threshold (step S26: YES), it is not necessary to calibrate the pressing load. Therefore, the calibration unit 62 operates the XY table 11. As a result, the capillary 15 moves to the inside of the bonding area BA (step S28). Thereafter, the process returns to step S15 in FIG.
- the microcomputer 60 determines whether or not to stop the operation of the wire bonding apparatus 100. As a result, the bonding operation is resumed or the operation of the wire bonding apparatus 100 is stopped.
- the wire bonding apparatus 100 presses the leaf spring 31 using the capillary 15. As a result, the leaf spring 31 is distorted.
- the calibration unit 62 performs the calibration process of the control unit 61. This process is based on the acquisition result of the strain of the leaf spring 31 acquired by the strain gauge unit 54 and the strain gauge unit 55.
- the leaf spring 31 is disposed outside the bonding area BA. . Therefore, for example, compared with the case where a load cell is attached in the bonding area BA, the stop time of the wire bonding apparatus 100 for performing the calibration process can be shortened. As a result, the operation time of the wire bonding apparatus 100 increases. Therefore, it is possible to achieve both improvement in productivity and calibration of the pressing load of the capillary 15.
- the calibration processing of the wire bonding apparatus 100 is performed so that the first distortion of the leaf spring 31 and the pressing load of the capillary 15 in the non-pressed state where the capillary 15 is not pressing the leaf spring 31 are set to the target values by the control unit 61.
- the measured value of the pressing load (first value) To the third measured load)
- the calibration unit 62 repeats the actual measurement process, the comparison process, and the correction process until the load error becomes less than the load threshold.
- an actual measurement value of the pressing load is calculated according to the second strain in the pressed state with the first strain in the non-pressed state as a reference. According to this calculation, the standard is unlikely to vary. Therefore, for example, compared with the case where the actual measurement value of the pressing load is calculated according to the displacement of the leaf spring 31, the actual measurement value of the pressing load can be calculated with high accuracy. As a result, the calibration process can be performed with high accuracy.
- the reference adopted by the wire bonding apparatus 100 is the first actually measured load based on the first strain in the non-pressed state.
- a method of calculating an actual measurement value of the pressing load based on the displacement of the leaf spring 31 due to the pressing of the capillary 15 may be considered.
- the non-pressed state can be easily realized by separating the capillary 15 and the leaf spring 31, for example. Therefore, it is possible to suppress variations in the first actually measured load serving as a reference.
- the actual measurement value of the pressing load can be calculated with high accuracy. Therefore, the calibration process can be performed with high accuracy.
- the elastic part of the wire bonding apparatus 100 is a leaf spring 31 supported in a cantilever shape.
- the strain gauge portion 54 includes strain gauges 54 a and 54 b provided on the upper surface 31 c of the leaf spring 31.
- the strain gauge portion 55 includes strain gauges 55 a and 55 b provided on the lower surface 31 d of the leaf spring 31.
- the strain gauges 54 a, 54 b, 55 a, 55 b are provided on both surfaces of the leaf spring 31. Therefore, the expansion / contraction distortion of the leaf spring 31 accompanying the temperature change is offset. As a result, it is not necessary to wait for the temperature of the bonding area BA of the wire bonding apparatus 100 to decrease in order to perform the calibration process. As a result, the wire bonding apparatus 100 can be continuously operated, and productivity can be further improved.
- the wire bonding apparatus 100 ensures the same calibration accuracy as the conventional calibration work performed by the operator using the load cell attached in the bonding area with the wire bonding apparatus stopped, and the pressing load. It can be said that the calibration is fully automatic. In addition, the wire bonding apparatus 100 has improved reliability and longer life. Furthermore, it is possible to omit an operator who performs calibration work. That is, the wire bonding apparatus 100 realizes so-called human-less calibration work. Since continuous operation of the wire bonding apparatus 100 can be realized, maintenance time for calibration work of the wire bonding apparatus 100 is substantially unnecessary.
- the calibration unit 62 repeats the actual measurement process, the comparison process, and the correction process as the calibration process until the load error becomes less than the load threshold.
- the calibration unit 62 may complete the actual measurement process, the comparison process, and the correction process at a time.
- the calibration unit 62 calculates a first actually measured load based on the first strain, calculates a second actually measured load based on the second strain, and performs a third actually measured load based on the first actually measured load and the second actually measured load.
- the load was calculated.
- the method of calculating the actual measurement value of the pressing load is not limited to this. For example, a distortion difference is calculated based on the first distortion and the second distortion. Thereafter, the third actually measured load may be calculated based on the calculated strain difference.
- the leaf spring 31 was supported in a cantilever shape. However, the leaf spring 31 may have other support forms.
- the current value applied to the stator 41 of the motor 40 is exemplified as the drive source control data in the controller 61.
- the control data of the drive source may be power supplied to the motor 40 or the like.
- the drive source control data may be any data that can change the pressing load of the capillary 15 so as to reduce the load error.
- strain gauge portion 54 and the strain gauge portion 55 four strain gauges 54a, 54b, 55a, and 55b are illustrated. However, the number of strain gauges is not limited to four.
- the elastic part is not limited to the leaf spring 31.
- the elastic portion one that causes distortion, such as a Robertval mechanism, may be employed.
- an elastic part assembly 20A having a beam member 32 shown in FIG. 7 may be adopted.
- FIG. 7 is a side view of a modified example of the elastic portion.
- FIG. 7B is a side view illustrating a non-pressed state of the elastic portion of FIG.
- FIG. 7C is a side view illustrating the pressing state of the elastic portion in FIG.
- the elastic part assembly 20 ⁇ / b> A is different from the plate spring assembly 20 in that a beam member 32 is used instead of the plate spring 31.
- the shape of the beam member 32 is a long plate or prism that extends in the same direction as the longitudinal direction of the leaf spring 31.
- the beam member 32 is a cantilever beam, and one end portion 32a is supported.
- the beam member 32 is provided with a low rigidity portion 32f.
- the low-rigidity part 32f has lower rigidity than the one end part 32a and the other end part 32b in the intermediate part 32e sandwiched between the one end part 32a and the other end part 32b in the longitudinal direction.
- the low-rigidity portion 32f may be a space formed inside the beam member 32, for example.
- the elastic part assembly 20 ⁇ / b> A includes a strain gauge part (third strain gauge) 56 and a strain gauge part (fourth strain gauge) 57.
- the strain gauge unit 56 and the strain gauge unit 57 are acquisition units that acquire the strain of the beam member 32.
- the strain gauge portion 56 is provided on the upper surface 32 c and the lower surface 32 d of the one end portion 32 a of the beam member 32.
- the strain gauge portion 57 is provided on the upper surface 32 c and the lower surface 32 d of the other end portion 32 b of the beam member 32.
- the strain gauge part 56 may include a strain gauge 56a and a strain gauge 56b.
- the strain gauge 56 a is provided on the upper surface 32 c of the beam member 32.
- the strain gauge 56 b is provided on the lower surface 32 d of the beam member 32.
- the strain gauge portion 57 may include a strain gauge 57a and a strain gauge 57b.
- the strain gauge 57 a is provided on the upper surface 32 c of the beam member 32.
- the strain gauge 57 b is provided on the lower surface 32 d of the beam member 32.
- the beam member 32 has a low-rigidity portion 32f provided in the intermediate portion 32e. According to the low-rigidity part 32f, the distortion of the beam 32 increases at the boundary part between the one end part 32a and the intermediate part 32e and at the boundary part between the other end part 32b and the intermediate part 32e. As a result, the distortion of the beam member 32 can be acquired with high sensitivity.
- the strain gauge part 56 and the strain gauge part 57 are provided on both surfaces of the beam member 32. As a result, the expansion and contraction distortion of the beam 32 due to the temperature change is offset. Therefore, it is not necessary to wait until the temperature of the bonding area BA of the wire bonding apparatus 100 decreases in order to perform the calibration work. As a result, even in this case, the wire bonding apparatus 100 can be operated continuously, and the productivity can be further improved.
- an elastic part assembly 20B shown in FIG. 8 may be adopted.
- FIG. 8 is a side view showing another modification of the elastic portion.
- the elastic part assembly 20 ⁇ / b> B has strain gauges 58 and 59.
- the strain gauges 58 and 59 are attached to the columnar body 33 constituting a part of the block body.
- the elastic part and the acquisition part may acquire the strain of the columnar body 33 pressed against the capillary 15 from above with the strain gauges 58 and 59.
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Abstract
Description
図1は、本開示のワイヤボンディング装置の平面図である。図1に示されるように、ワイヤボンディング装置100は、キャピラリ15(ボンディングツール)を備える。キャピラリ15は、所定のボンディングエリアBAにおいてワイヤを電極に押圧することにより、ワイヤを電極に接合する。電極は、半導体チップ等の電子部品19の電極、電子部品19が取り付けられた基板18の電極等を含む。なお、以下の説明において、便宜上、ガイドレール16の延在方向をX方向とする。X方向に直交する水平方向をY方向とする。X方向及びY方向に直交する上下方向をZ方向とする。
図1に示されるように、板バネ組立体20は、フレーム10上において、ボンディングアーム13側のガイドレール16とヒートブロック17との間に取り付けられている。板バネ組立体20は、ヒートブロック17からの熱を遮るためのカバーを備えてもよい。
較正部62は、制御部61の較正処理を実施する。この較正処理は、歪みゲージ部54,55の取得結果に基づく。この較正処理によれば、押圧荷重の目標値と押圧荷重の実測値との荷重誤差が所定範囲内となる。較正部62の較正処理について詳述する。較正部62は、較正処理の一例として、以下に説明する実測処理、比較処理、及び補正処理を実施する。較正部62は、較正処理を、荷重誤差が予め設定された荷重閾値未満となるまで繰り返す。
以上、本開示に係るワイヤボンディング装置100について説明したが、本開示に係るワイヤボンディング装置100は、上記実施形態に限られるものではない。
Claims (4)
- 所定のボンディングエリアにおいてワイヤを電極に押圧しつつ接合するボンディングツールを備えるワイヤボンディング装置であって、
前記ボンディングツールを上下方向に沿って駆動する駆動源と、
前記駆動源に接続され、前記ボンディングツールの押圧荷重を制御する制御部と、
前記ボンディングエリアの外側に配置され、前記押圧荷重で歪みを生じる弾性部と、
前記弾性部の歪みを取得する取得部と、
前記取得部の取得結果に基づいて、予め設定された前記押圧荷重の目標値と前記押圧荷重の実測値との荷重誤差が所定範囲内となるように、前記制御部の較正処理を実施する較正部と、を備える、ワイヤボンディング装置。 - 前記較正処理は、
前記ボンディングツールが前記弾性部を押圧していない非押圧状態での前記弾性部の第1歪みと、前記制御部によって前記押圧荷重が前記目標値となるように制御されている場合において前記ボンディングツールが前記弾性部を当該押圧荷重で押圧している押圧状態での前記弾性部の第2歪みと、に基づいて、前記押圧荷重の前記実測値を算出する実測処理と、
算出した前記実測値と前記押圧荷重の目標値とから荷重誤差を算出すると共に、前記荷重誤差と予め設定された荷重閾値とを比較する比較処理と、
前記荷重誤差が前記荷重閾値以上である場合、前記荷重誤差が小さくなるように前記制御部における前記駆動源の制御データを変更する補正処理と、を含み、
前記較正部は、
前記荷重誤差が前記荷重閾値未満となるまで、前記実測処理、前記比較処理、及び前記補正処理を繰り返す、請求項1記載のワイヤボンディング装置。 - 前記弾性部は、片持ち梁状に支持された板バネであり、
前記取得部は、前記板バネの上面に設けられた第1歪みゲージと、前記板バネの下面に設けられた第2歪みゲージと、を含む、請求項1又は2記載のワイヤボンディング装置。 - 前記弾性部は、片持ち梁状に支持され、長手方向の一端部及び他端部に挟まれた中間部において前記一端部及び前記他端部よりも低い剛性を有する低剛性部が設けられた梁材であり、
前記取得部は、前記梁材の前記一端部の上面及び下面に設けられた第3歪みゲージと、前記梁材の前記他端部の上面及び下面に設けられた第4歪みゲージとを含む、請求項1又は2記載のワイヤボンディング装置。
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CN201980005587.6A CN111316410A (zh) | 2018-02-06 | 2019-01-30 | 打线接合装置 |
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- 2019-01-30 WO PCT/JP2019/003214 patent/WO2019155965A1/ja active Application Filing
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