WO2020009243A1 - 半導体ダイのピックアップシステム - Google Patents
半導体ダイのピックアップシステム Download PDFInfo
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- WO2020009243A1 WO2020009243A1 PCT/JP2019/026910 JP2019026910W WO2020009243A1 WO 2020009243 A1 WO2020009243 A1 WO 2020009243A1 JP 2019026910 W JP2019026910 W JP 2019026910W WO 2020009243 A1 WO2020009243 A1 WO 2020009243A1
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- Prior art keywords
- semiconductor die
- pickup
- pressure
- flow rate
- peeling
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67144—Apparatus for mounting on conductive members, e.g. leadframes or conductors on insulating substrates
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/50—Assembly of semiconductor devices using processes or apparatus not provided for in a single one of the subgroups H01L21/06 - H01L21/326, e.g. sealing of a cap to a base of a container
- H01L21/52—Mounting semiconductor bodies in containers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67242—Apparatus for monitoring, sorting or marking
- H01L21/67253—Process monitoring, e.g. flow or thickness monitoring
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/677—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for conveying, e.g. between different workstations
- H01L21/67703—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for conveying, e.g. between different workstations between different workstations
- H01L21/67721—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for conveying, e.g. between different workstations between different workstations the substrates to be conveyed not being semiconductor wafers or large planar substrates, e.g. chips, lead frames
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/683—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L21/6835—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support
- H01L21/6836—Wafer tapes, e.g. grinding or dicing support tapes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/683—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L21/6838—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping with gripping and holding devices using a vacuum; Bernoulli devices
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2221/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof covered by H01L21/00
- H01L2221/67—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere
- H01L2221/683—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L2221/68304—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support
- H01L2221/68327—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support used during dicing or grinding
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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- H01L2221/67—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere
- H01L2221/683—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L2221/68304—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support
- H01L2221/68381—Details of chemical or physical process used for separating the auxiliary support from a device or wafer
Definitions
- the present invention relates to a semiconductor die pickup system used for a bonding apparatus (bonding system).
- Semiconductor dies are manufactured by cutting a 6 inch or 8 inch wafer into a predetermined size. At the time of cutting, a dicing sheet is attached to the back surface so that the cut semiconductor dies do not fall apart, and the wafer is cut from the front side by a dicing saw or the like. At this time, the dicing sheet affixed to the back surface is slightly cut, but is not cut, and holds each semiconductor die. Each of the cut semiconductor dies is picked up one by one from the dicing sheet and sent to the next step such as die bonding.
- a dicing sheet As a method of picking up a semiconductor die from a dicing sheet, a dicing sheet is sucked on the surface of a disk-shaped suction piece, and the semiconductor die is sucked by a collet.
- a method has been proposed in which a semiconductor die is picked up from a dicing sheet by raising a collet and raising a collet (see, for example, FIGS. 9 to 23 of Patent Document 1).
- peeling the semiconductor die from the dicing sheet it is effective to first peel the peripheral portion of the semiconductor die and then peel the central portion of the semiconductor die.
- the push-up block is divided into three parts: one that pushes up the peripheral portion of the semiconductor die, one that pushes up the center of the semiconductor die, and one that pushes up the middle of the die.
- the three blocks are raised to a predetermined height.
- the middle and middle blocks are raised higher than the surrounding blocks, and finally the center block is raised higher than the middle block.
- the collet and the peripheral, intermediate, and center push-up blocks are set at a predetermined height higher than the surface of the ejector cap. After raising the collet, leave the collet at the same height, lower the surrounding push-up block, the middle push-up block, and then the push-up block to a position below the ejector cap surface, and peel the dicing sheet from the semiconductor die A method has been proposed (for example, see Patent Document 2).
- Patent Document 3 also discloses that the bending (bending) of a semiconductor die is detected (determined) by a change in the flow rate of suction air from a collet.
- semiconductor dies have become extremely thin, for example, some are about 20 ⁇ m.
- the thickness of the dicing sheet is about 100 ⁇ m, the thickness of the dicing sheet is four to five times the thickness of the semiconductor die. If such a thin semiconductor die is to be separated from the dicing sheet, the deformation of the semiconductor die following the deformation of the dicing sheet is more likely to occur.
- Patent Literature 1 since the bending operation of the semiconductor die is detected and the peeling operation is changed, damage to the semiconductor die when the semiconductor die is picked up from the dicing sheet may be suppressed.
- the peeling operation is changed (changed in real time) while detecting the curvature of the semiconductor die performing the pickup, the control of the pickup becomes very complicated. Because a series of processes of detecting the curvature of the semiconductor die, determining whether to change the peeling operation from the detection result, changing the peeling operation from the determination result, or moving the operation forward without changing, are repeated many times. In addition, there is a concern that the time required for the peeling operation is prolonged. Therefore, in practice, the peeling operation is not changed in real time, and the peeling operation assuming the semiconductor die that is most difficult to peel is often applied uniformly to all the semiconductor dies.
- a long-time peeling operation is also applied to a semiconductor die that can be easily peeled, to which a simplified short-time peeling operation can be applied.
- a suitable peeling operation is applied to each of the semiconductor dies, and that the balance between the suppression of the damage to the semiconductor dies and the speeding up of the pickup of the semiconductor dies is made appropriate for each of the semiconductor dies.
- the releasability of the semiconductor die from the dicing sheet may change depending on the position of the semiconductor die on the wafer.
- the releasability (easiness of peeling or difficulty of peeling) may gradually change from the semiconductor die near the center of the wafer to the semiconductor die near the outer periphery.
- the releasability of a semiconductor die in a specific region of a wafer may be significantly different from the releasability of a semiconductor die in another region.
- Such a tendency of the releasability according to the position of the semiconductor die of the wafer is often common to a plurality of wafers that are continuously picked up.
- the speed of the pick-up can be increased by applying a short-time separation operation to the semiconductor dies located at positions where they are easily separated.
- a peeling operation suitable for each of the semiconductor dies in accordance with the peelability of each of the positions of the semiconductor dies, it is possible to appropriately balance the suppression of damage to the semiconductor dies and the increase in the speed of pickup of the semiconductor dies.
- a mechanism for grasping the releasability of each semiconductor die according to the position of each semiconductor die on the wafer is required. Also, after grasping the peelability of each semiconductor die according to the position of each semiconductor die of the wafer, or when grasping in advance, to apply a peeling operation suitable for each of the semiconductor dies of the wafer. A mechanism is needed.
- the object of the present invention is to make it possible to pick up each semiconductor die by applying a peeling operation (pickup operation) suitable for each semiconductor die.
- an object of the present invention is to grasp the peelability of each semiconductor die according to the position of each semiconductor die on a wafer.
- the semiconductor die pickup system of the present invention is a pickup system that separates and picks up a semiconductor die obtained by dicing a wafer from a dicing sheet, and performs a pick-up operation based on a pickup condition for picking up a semiconductor die from the dicing sheet.
- picking up control is performed to pick up a semiconductor die from a dicing sheet according to the correspondence information associated with each semiconductor die.
- the generating means includes: a level table in which each semiconductor die in one wafer is associated with a level value that is an identifier of a plurality of pickup conditions;
- a condition table may be generated in which one is associated with one of the pickup conditions, and the correspondence information may be determined by a level table and a condition table.
- the plurality of level values may be values indicating the length of time required for pickup.
- a display unit for displaying a screen and a display control unit are provided, and the display control unit displays a map image simulating each semiconductor die of one wafer on the display unit. Then, in the map image, at least one of a color, a pattern, a character, a numeral, and a symbol corresponding to the level value may be added to the semiconductor die image corresponding to the semiconductor die associated with the level value.
- an input unit for inputting information is provided, and the generation unit selects one or a plurality of semiconductor die images on the map image from the input unit, and selects a plurality of level values.
- a level table may be generated or updated by associating the selected level value with the semiconductor die corresponding to the selected semiconductor die image.
- a collet for adsorbing the semiconductor die, a suction mechanism connected to the collet and suctioning air from the surface of the collet, a flow sensor for detecting a suction air flow rate of the suction mechanism, and a semiconductor die
- a storage unit that stores expected flow rate information indicating a time change of the suction air flow rate detected by the flow rate sensor when the semiconductor die is picked up
- a generation unit When each semiconductor die in one wafer is picked up, actual flow rate information indicating a time change of the suction air flow rate detected by the flow rate sensor is obtained, and actual flow rate information and expected flow rate information of each of the plurality of semiconductor dies are acquired. Calculate a correlation value and associate a level value with each of the plurality of semiconductor dies based on each of the plurality of correlation values. Generating a level table, or updates may be.
- the display control means displays the correlation value of each semiconductor die corresponding to each semiconductor die image in or near each semiconductor die image in the map image of the display unit.
- the correlation value of the semiconductor die corresponding to the specific semiconductor die image may be displayed at a predetermined position on the screen on the display unit.
- a level value in which the time required for pickup is shorter is associated with each semiconductor die from the outer peripheral side to the inner peripheral side of one wafer. , May be.
- a stage including a suction surface for sucking the back surface of the dicing sheet, and an opening pressure of an opening provided on the suction surface of the stage are set to a first pressure close to vacuum and a second pressure close to atmospheric pressure.
- An opening pressure switching mechanism for switching between the first pressure and the second pressure when the semiconductor die is picked up may include the number of times of switching the opening pressure between the first pressure and the second pressure.
- the type of the pickup condition may include a holding time for holding the opening pressure at the first pressure.
- the semiconductor die pickup system includes a plurality of moving elements disposed in the opening, the tip surface moving between a first position higher than the suction surface and a second position lower than the first position, A step surface forming mechanism for forming a step surface with respect to the suction surface, wherein the control means sequentially picks up the plurality of moving elements at predetermined time intervals when picking up the semiconductor die, or a combination of predetermined moving elements.
- control for moving from the first position to the second position may be performed, and the type of the pickup condition may include the predetermined time.
- the type of pickup condition may include the number of the moving elements that are simultaneously moved from the first position to the second position.
- a collet for adsorbing the semiconductor die is provided, and the type of pickup condition includes a waiting time from when the collet lands on the semiconductor die to when the collet starts to lift the semiconductor die. Good.
- the semiconductor die pickup system of the present invention is a semiconductor die pickup system for picking up a semiconductor die attached to a surface of a dicing sheet, and a collet for adsorbing the semiconductor die, connected to the collet, and from a surface of the collet.
- a suction mechanism for sucking air a flow sensor for detecting the suction air flow rate of the suction mechanism, a control unit for controlling a peeling operation for peeling the semiconductor die from the dicing sheet during pick-up, and a display for displaying a screen
- the control unit when picking up each semiconductor die in one wafer, obtains the actual flow rate change that is the time change of the suction air flow rate detected by the flow rate sensor, and each of the plurality of semiconductor dies Easy separation of multiple semiconductor dies from each dicing sheet based on actual flow rate change
- the peeling degree which is the degree of peeling difficulty, is obtained, and a map image that simulates each semiconductor die of one wafer is displayed on the display unit. And at least one of a color, a pattern, a character, a numeral, and a symbol according to the degree of peeling of the semiconductor die.
- the present invention has an effect that each semiconductor die can be picked up by applying a peeling operation (pickup operation) suitable for each semiconductor die.
- the present invention has an effect that the detachability of each semiconductor die according to the position of each semiconductor die on one wafer can be grasped.
- FIG. 1 is a perspective view showing a stage of a semiconductor die pickup system according to an embodiment of the present invention. It is explanatory drawing which shows the wafer stuck on the dicing sheet. It is explanatory drawing which shows the semiconductor die stuck on the dicing sheet. It is explanatory drawing which shows the structure of a wafer holder. It is explanatory drawing which shows the structure of a wafer holder.
- FIG. 4 is an explanatory diagram showing an operation at a predetermined level value of the semiconductor die pickup system in the embodiment of the present invention.
- FIG. 4 is an explanatory diagram showing an operation at a predetermined level value of the semiconductor die pickup system in the embodiment of the present invention.
- FIG. 4 is an explanatory diagram showing an operation at a predetermined level value of the semiconductor die pickup system in the embodiment of the present invention.
- FIG. 4 is an explanatory diagram showing an operation at a predetermined level value of the semiconductor die pickup system in the embodiment of the present invention.
- FIG. 4 is an explanatory diagram showing an operation at a predetermined level value of the semiconductor die pickup system in the embodiment of the present invention.
- FIG. 4 is an explanatory diagram showing an operation at a predetermined level value of the semiconductor die pickup system in the embodiment of the present invention.
- FIG. 4 is an explanatory diagram showing an operation at a predetermined level value of the semiconductor die pickup system in the embodiment of the present invention.
- FIG. 4 is an explanatory diagram showing an operation at a predetermined level value of the semiconductor die pickup system in the embodiment of the present invention.
- FIG. 4 is an explanatory diagram showing an operation at a predetermined level value of the semiconductor die pickup system in the embodiment of the present invention.
- FIG. 4 is an explanatory diagram showing an operation at a predetermined level value of the semiconductor die pickup system in the embodiment of the present invention.
- FIG. 4 is an explanatory diagram showing an operation at a predetermined level value of the semiconductor die pickup system in the embodiment of the present invention.
- FIG. 4 is an explanatory diagram showing an operation at a predetermined level value of the semiconductor die pickup system in the embodiment of the present invention.
- FIG. 7 is a diagram showing a time change with respect to the air leak amount of FIG.
- FIG. 4 is a diagram illustrating an example of a parameter table according to the embodiment of the present invention.
- FIG. 5 is a diagram showing a time change of the scalar. It is explanatory drawing about the identification number of each semiconductor die of one wafer in embodiment of this invention.
- FIG. 4 is a diagram illustrating an example of a level table according to the embodiment of the present invention.
- FIG. 9 is an explanatory diagram showing an example of a level value associated with each semiconductor die of one wafer. It is a figure showing the setting display screen in an embodiment of the present invention.
- FIG. 4 is a diagram illustrating an example of a threshold table according to the embodiment of the present invention. It is a figure showing the setting display screen in an embodiment of the present invention. It is a figure showing the setting display screen in an embodiment of the present invention. It is a figure showing the setting display screen in an embodiment of the present invention. It is a figure showing the setting display screen in an embodiment of the present invention. It is a figure showing the setting display screen in an embodiment of the present invention.
- FIG. 9 is an explanatory diagram showing another example of the level value associated with each semiconductor die of one wafer.
- FIG. 9 is an explanatory diagram showing still another example of a level value associated with each semiconductor die of one wafer.
- FIG. 9 is an explanatory diagram showing still another example of a level value associated with each semiconductor die of one wafer. It is a functional block diagram of a control part in an embodiment of the present invention.
- a semiconductor die pickup system 500 includes a wafer holder 10 that holds a dicing sheet 12 on which a semiconductor die 15 is adhered to a front surface 12a and moves in a horizontal direction.
- a display section 450 that is a display for displaying a screen.
- the step surface forming mechanism 300 and the step surface forming mechanism driving section 400 are housed in the base portion 24 of the stage 20.
- the step surface forming mechanism 300 is located above the stage 20, and the step surface forming mechanism driving unit 400 is located below the stage 20.
- the step surface forming mechanism 300 includes a plurality of moving elements 30 that move in the vertical direction. The distal end surfaces of the plurality of moving elements 30 move downward as shown by the arrow a in FIG. 1 by the step surface forming mechanism driving unit 400. Details of the moving element 30 will be described later.
- the opening pressure switching mechanism 80 that switches the pressure of the opening 23 of the stage 20 includes a three-way valve 81 and a drive unit 82 that drives the three-way valve 81 to open and close.
- the three-way valve 81 has three ports. The first port is connected to the base portion 24 communicating with the opening 23 of the stage 20 by a pipe 83, the second port is connected to a vacuum device 140 by a pipe 84, and the third port The port is connected to a pipe 85 that is open to the atmosphere.
- Driving unit 82 the first port and the second port and blocks the third port communicates, the pressure in the opening 23 or the first pressure P 1 near vacuum, made to communicate with the first port and the third port blocking the second port, switching the pressure of the opening 23 by or to a second pressure P 2 close to atmospheric pressure, the pressure of the opening 23 between the first pressure P 1 and the second pressure P 2.
- the suction pressure switching mechanism 90 for switching the suction pressure of the suction surface 22 of the stage 20 includes a three-way valve 91 having three ports, and a driving unit 92 for opening and closing the three-way valve 91.
- the first port is connected to a suction hole 27 communicating with the groove 26 of the stage 20 via a pipe 93
- the second port is connected to a vacuum device 140 via a pipe 94
- the third port is connected to a pipe 95 open to the atmosphere. I have.
- the first port and the second port and blocks the third port communicates, groove 26, or the pressure of the suction surface 22 or the third pressure P 3 closer to the vacuum, the first port and the third port blocking the second port to communicate with each other, by or with the fourth pressure P 4 close grooves 26, or the pressure of the suction surface 22 to the atmospheric pressure, the grooves 26, or the pressure of the suction surface 22 third pressure switching between P 3 and the fourth pressure P 4.
- the suction mechanism 100 that sucks air from the surface 18a of the collet 18 includes a three-way valve 101 having three ports and a driving unit 102 that opens and closes the three-way valve 101, like the opening pressure switching mechanism 80.
- the port is connected to a suction hole 19 communicating with the surface 18a of the collet 18 by a pipe 103, the second port is connected to a vacuum device 140 by a pipe 104, and the third port is connected to a pipe 105 open to the atmosphere.
- the drive unit 102 communicates the first port with the second port to shut off the third port, sucks air from the surface 18a of the collet 18 to make the pressure on the surface 18a of the collet 18 close to a vacuum,
- the port is communicated with the third port to block the second port, and the pressure on the surface 18a of the collet 18 is set to a pressure close to the atmospheric pressure.
- a flow sensor 106 for detecting the flow rate of air (suction air flow rate) sucked into the vacuum device 140 from the surface 18a of the collet 18 is attached to the pipe 103 connecting the suction hole 19 of the collet 18 and the three-way valve 101. ing.
- the wafer holder horizontal driving unit 110, the stage vertical driving unit 120, and the collet driving unit 130 drive the wafer holder 10, the stage 20, and the collet 18 in the horizontal direction or the vertical direction, for example, by a motor and gears provided inside. Is what you do.
- the control unit 150 includes a CPU 151 that performs various arithmetic processes and control processes, a storage unit 152, and a device / sensor interface 153.
- the CPU 151, the storage unit 152, and the device / sensor interface 153 are connected by a data bus 154.
- Computer includes a control program 155 for pick-up control of the semiconductor die 15, a setting display program 156 for associating the peeling operation at the time of pick-up with each semiconductor die 15 of one wafer, and one control program 156.
- a level table 159 (see FIG. 23) in which each semiconductor die 15 of the wafer is associated with a peeling operation level value, and a parameter table 160 (see FIG.
- FIG. 36 is a functional block diagram of the control unit 150.
- the control unit 150 functions as the pickup control unit 600 (control unit) by executing the control program 155.
- the control unit 150 functions as a generation unit 602 and a display control unit 604, which will be described later, by executing the setting display program 156.
- the opening pressure switching mechanism 80, the suction pressure switching mechanism 90, the driving units 82, 92, 102 of the three-way valves 81, 91, 101 of the suction mechanism 100, and the step surface forming mechanism driving unit 400 The wafer holder horizontal drive unit 110, stage vertical drive unit 120, collet drive unit 130, and vacuum device 140 are connected to the device / sensor interface 153, respectively, and are driven by instructions from the control unit 150. Further, the flow sensor 106 is connected to the device / sensor interface 153, and the detection signal is taken into the control unit 150 and processed.
- the input unit 410 and the display unit 450 are also connected to the device / sensor interface 153, the input information from the input unit 410 is taken into the control unit 150, and the output image information from the control unit 150 is sent to the display unit 450. .
- the stage 20 has a cylindrical shape, and a flat suction surface 22 is formed on the upper surface.
- a square opening 23 is provided at the center of the suction surface 22, and a moving element 30 is attached to the opening 23.
- a gap d is provided between the inner surface 23a of the opening 23 and the outer peripheral surface 33 of the moving element 30.
- a groove 26 is provided around the opening 23 so as to surround the opening 23.
- Each groove 26 is provided with a suction hole 27, and each suction hole 27 is connected to a suction pressure switching mechanism 90.
- the moving element 30 includes a columnar moving element 45 arranged in the center, two intermediate annular moving elements 40 and 41 arranged around the columnar moving element 45, and And a peripheral annular moving element 31 disposed at the periphery and disposed at the outermost periphery.
- the number of intermediate annular moving elements is two, but the number of intermediate annular moving elements may be one, or three or more. In the drawings after FIG. 6, the number of the intermediate annular moving elements 40 is one for the sake of simplicity. As shown in FIG.
- the columnar moving element 45, the intermediate annular mobile elements 40, each of the distal end surface 47,38b near annular mobile elements 31, 38a is first projected by the height H 0 from the suction surface 22 of the stage 20 It is located at one position and forms the same surface (a step surface with respect to the suction surface 22).
- the peripheral annular moving element 31, the intermediate annular moving element 40, and the columnar moving element 45 are sequentially moved from the first position to the second position lower than the first position at predetermined time intervals. Alternatively, it is simultaneously moved from the first position to the second position by a combination of predetermined moving elements.
- ⁇ Dicing sheet setting process> a process of setting the dicing sheet 12 to which the semiconductor die 15 is attached on the wafer holder 10 will be described.
- an adhesive dicing sheet 12 is attached to the back surface of the wafer 11, and the dicing sheet 12 is attached to a metal ring 13.
- the wafer 11 is handled while being attached to the metal ring 13 via the dicing sheet 12 in this manner.
- the wafer 11 is cut from the front side by a dicing saw or the like in a cutting step to be each semiconductor die 15. Cut gaps 14 formed during dicing are formed between the semiconductor dies 15. The depth of the cut gap 14 extends from the semiconductor die 15 to a part of the dicing sheet 12, but the dicing sheet 12 is not cut, and each semiconductor die 15 is held by the dicing sheet 12.
- the wafer holder 10 includes an annular expand ring 16 having a flange portion, and a ring retainer 17 for fixing the ring 13 on the flange of the expand ring 16.
- the ring presser 17 is driven by a ring press drive unit (not shown) in a direction to advance and retreat toward the flange of the expand ring 16.
- the inside diameter of the expanding ring 16 is larger than the diameter of the wafer on which the semiconductor die 15 is disposed, the expanding ring 16 has a predetermined thickness, and the flange is outside the expanding ring 16 and is separated from the dicing sheet 12.
- the outer periphery of the expanding ring 16 on the dicing sheet 12 side has a curved surface configuration so that the dicing sheet 12 can be stretched smoothly when the dicing sheet 12 is attached to the expanding ring 16. As shown in FIG. 5B, the dicing sheet 12 to which the semiconductor die 15 is attached is in a substantially planar state before being set on the expanding ring 16.
- the dicing sheet 12 when the dicing sheet 12 is set on the expanding ring 16, the dicing sheet 12 is extended along the curved surface above the expanding ring by a step difference between the upper surface of the expanding ring 16 and the flange surface. Is applied to the dicing sheet 12 fixed to the dicing sheet 12 from the center to the periphery. Further, since the dicing sheet 12 is extended by the pulling force, the gap 14 between the semiconductor dies 15 stuck on the dicing sheet 12 is widened.
- each semiconductor die 15 from the dicing sheet 12 may change depending on the position of each semiconductor die 15 on one wafer.
- the ease of peeling (easiness of peeling) may gradually increase from the semiconductor die 15 near the outer periphery to the semiconductor die 15 near the center of the wafer. This is because when the dicing sheet 12 is set on the expanding ring 16 of the wafer holder 10, the vicinity of the center of the dicing sheet 12 is more strongly pulled than the vicinity of the outer periphery. It is expected to increase.
- Such a tendency of the releasability of the wafer according to the position of the semiconductor die 15 is often common to a plurality of wafers that are continuously picked up.
- the speed of the pickup is increased by applying a simplified short-time separation operation (pickup operation) to the semiconductor die 15 at a position where separation is easy.
- pickup operation a simplified short-time separation operation
- pickup operation a long-time peeling operation
- damage to the semiconductor die 15 and mistaken pickup can be suppressed.
- the semiconductor die pickup system 500 of the present embodiment can change the peeling operation at the time of pickup for each semiconductor die 15 in one wafer.
- an identification number also referred to as a die identification number or individual information
- a parameter table 160 condition table associating each level value with parameter values (also referred to as pickup conditions) of a plurality of types of peeling parameters as shown in FIG.
- the level table 159 and the parameter table 160 correspond to the peeling operation (parallel value of the peeling parameter) applied to each semiconductor die 15 on one wafer.
- the level values are defined from level 1 where the time required for the peeling operation (pickup time) is shortest to level 8 where the time is longest.
- each semiconductor die 15 Prior to the pick-up operation, an operator or the like allows each semiconductor die 15 via a setting display screen 460 (see FIG. 25) to be described later in consideration of the peelability of each semiconductor die 15 in accordance with the position of each semiconductor die 15 on the wafer.
- a level table 159 is generated.
- the level table 159 is referred to, and a peeling operation (pickup operation) is performed for each semiconductor die 15 in one wafer according to the associated level value.
- the operation of the pickup will be described by taking as an example the pickup of the semiconductor die 15 to which the level 4 peeling operation of the parameter table 160 is applied.
- the various peeling parameters in the parameter table 160 and the setting display screen 460 will be described later in detail.
- the control unit 150 functions as a pickup control unit by executing the control program 155 shown in FIG. 1 and controls the pickup operation of the semiconductor die 15.
- the controller 150 controls a peeling operation for peeling the semiconductor die 15 from the dicing sheet 12 as a part of the pickup operation.
- the control unit 150 causes the wafer holder horizontal driving unit 110 to move the wafer holder 10 in the horizontal direction to a position above the standby position of the stage 20.
- the controller 150 temporarily stops the horizontal movement of the wafer holder 10.
- the control unit 150 uses the stage vertical drive unit 120 to bring the tip surfaces 47, 38b, 38a of the moving elements 45, 40, 31 into close contact with the back surface 12b of the dicing sheet 12, and open the suction surface 22.
- the stage 20 is raised until a region slightly away from 23 comes into close contact with the back surface 12b of the dicing sheet 12.
- control unit 150 raises the stage 20. To stop. Then, the control unit 150 again controls the wafer holder horizontal driving unit 110 to immediately above the front end surface (step surface) of the moving element 30 where the semiconductor die 15 to be picked up slightly protrudes from the suction surface 22 of the stage 20. Adjust the horizontal position to come to.
- the size of the semiconductor die 15 is smaller than the opening 23 of the stage 20 and larger than the width or the depth of the moving element 30.
- the end is between the inner surface 23 a of the opening 23 of the stage 20 and the outer peripheral surface 33 of the moving element 30, that is, right above the gap d between the inner surface 23 a of the opening 23 and the outer peripheral surface 33 of the moving element 30.
- the pressure of the groove 26 or the suction surface 22 of the stage 20 is atmospheric pressure
- the pressure of the opening 23 is also atmospheric pressure.
- each tip surface 47,38b in an initial state each mobile element 45,40,31, 38a, so that a first position protruding by a height H 0 from the suction surface 22 of the stage 20, the distal end surface 47, 38b, the height of the back surface 12b of the dicing sheet 12 in contact with the 38a has a first position protruding by a height H 0 from the suction surface 22.
- the back surface 12b of the dicing sheet 12 slightly floats from the suction surface 22 at the periphery of the opening 23, and is in close contact with the suction surface 22 in a region away from the opening 23.
- the control unit 150 lowers the collet 18 on the semiconductor die 15 by the collet driving unit 130 shown in FIG. 1 to land the surface 18 a of the collet 18 on the semiconductor die 15.
- FIG. 18 shows the height of the collet 18, the position of the columnar moving element 45, the position of the intermediate annular moving element 40, the position of the peripheral annular moving element 31, and the opening 23 during the level 4 peeling operation (pickup operation).
- FIG. 6 is a diagram showing a change over time of the opening pressure of FIG.
- the control unit 150 switches the three-way valve 101 to a direction in which the suction hole 19 of the collet 18 and the vacuum device 140 communicate with each other by the driving unit 102 of the suction mechanism 100.
- the suction hole 19 becomes a negative pressure, and air flows into the suction hole 19 from the surface 18a of the collet 18, so that the suction air flow rate detected by the flow rate sensor 106 as shown in FIG. (Air leak amount) increases from time t1 to time t2.
- the semiconductor die 15 is fixed by suction to the surface 18a, and air cannot flow from the surface 18a.
- the amount of air leak detected by the flow sensor 106 starts to decrease.
- the height of the front surface 18a of the collet 18 when the collet 18 lands on the semiconductor die 15 is the height of the tip surfaces 47, 38b, 38a of the moving elements 45, 40, 31 (adsorption).
- the height Hc is obtained by adding the thickness of the dicing sheet 12 and the thickness of the semiconductor die 15 to the height H 0 from the surface 22).
- the control unit 150 switching the suction pressure of the suction surface 22 of the stage 20 (not shown) from the fourth pressure P 4 close to the atmospheric pressure to a third pressure P 3 near vacuum Output command.
- the drive unit 92 of the suction pressure switching mechanism 90 switches the three-way valve 91 to a direction that allows the suction hole 27 and the vacuum device 140 to communicate with each other. Then, as shown by the arrow 201 in FIG. 7, the air groove 26 is sucked out into the vacuum device 140 through the suction holes 27, the suction pressure becomes the third pressure P 3 near vacuum.
- each tip surface 47,38b of each mobile element 45,40,31, 38a is a first dicing sheet 12 since a position protruding by a height H 0 from the suction surface 22 of the stage 20, obliquely downward pulling force F 1 is applied.
- the tensile force F 1 and the pulling force F 2 to pull the dicing sheet 12 in the lateral direction can be decomposed into a tensile force F 3 for pulling the dicing sheet 12 in the downward direction.
- the shear stress ⁇ is generated between the surface 12a of the semiconductor die 15 and the dicing sheet 12. Due to the shear stress ⁇ , a gap occurs between the outer peripheral portion or the peripheral portion of the semiconductor die 15 and the surface 12a of the dicing sheet 12. This displacement triggers the separation between the dicing sheet 12 and the outer peripheral portion or the peripheral portion of the semiconductor die 15.
- Control unit 150 As shown in FIG. 18 (e), and outputs an instruction for switching the opening pressure at time t3 the second from the pressure P 2 is close to the atmospheric pressure in the first pressure P 1 near vacuum.
- the drive unit 82 of the opening pressure switching mechanism 80 switches the three-way valve 81 in a direction that allows the opening 23 to communicate with the vacuum device 140.
- the air of the opening 23 is sucked into the vacuum apparatus 140, as shown in FIG. 18 (e), at time t4 the first pressure P 1 opening pressure close to vacuum Become.
- the dicing sheet 12 immediately above the gap d between the inner surface 23a of the opening 23 and the outer peripheral surface 33 of the moving element 30 is pulled downward. Further, the peripheral portion of the semiconductor die 15 located immediately above the gap d is pulled by the dicing sheet 12 and is bent and deformed downward as indicated by an arrow 204. Thereby, the peripheral portion of the semiconductor die 15 is separated from the surface 18a of the collet 18.
- time HT4 is a level 4 “first pressure holding time” defined in the parameter table 160 of FIG. HT4 is 130 ms in the example of FIG.
- the peripheral portion of the semiconductor die 15 causes the vacuum of the suction hole 19 of the collet 18 and the elasticity of the semiconductor die 15 to move the collet 18. It returns to the surface 18a.
- the amount of air leakage starts to decrease at time t4 in FIG. 18F, and continues to decrease.
- the control unit 150 As shown in FIG. 18 (e), outputs a command for switching to the time t5 the opening pressure from the first pressure P 1 closer to the vacuum in the second pressure P 2 close to atmospheric pressure.
- the driving unit 82 of the opening pressure switching mechanism 80 switches the three-way valve 81 so that the piping 85 that opens to the atmosphere and the opening 23 communicate with each other.
- Time t1 to t6 in FIG. 18 is the initial peeling.
- the peeling property between the semiconductor die 15 and the dicing sheet 12 is poor (the peeling degree is low)
- the periphery of the semiconductor die 15 is pulled by the dicing sheet 12 as shown by an arrow 204 in FIG. It takes a lot of time for the peripheral portion of the semiconductor die 15 to return to the surface 18a of the collet 18 as indicated by the arrow 207.
- the time during which the opening pressure is maintained at the first pressure P 1 time from time t4 to time t5 in FIG. 18E) is long, or the opening pressure is reduced to the first pressure P close to vacuum. 1 by applying a large number of times peeling operation for switching between the second pressure P 2 close to atmospheric pressure (level values), encourage separation of the peripheral portion and the dicing sheet 12 of the semiconductor die 15.
- the peeling property between the semiconductor die 15 and the dicing sheet 12 is good (the peeling degree is high)
- the periphery of the semiconductor die 15 is pulled by the dicing sheet 12 as indicated by an arrow 204 in FIG. 9, the time required for the peripheral portion of the semiconductor die 15 to return to the surface 18a of the collet 18 is short.
- the speed of the pickup is increased by applying a peeling operation (level value) in which the number of times of switching is reduced. In the example of the level 4 of FIG.
- the peripheral portion of the semiconductor die 15 is pulled by the dicing sheet 12 until the peripheral portion of the semiconductor die 15 returns to the surface 18 a of the collet 18 in accordance with the degree of easy detachment of the semiconductor die 15.
- the actual flow rate change also changes. Therefore, as will be described in detail later, it is possible to determine the degree of ease of peeling of the semiconductor die 15 from the dicing sheet 12 based on the actual flow rate change.
- Control unit 150 When the opening pressure at time t6 becomes the second pressure P 2 close to atmospheric pressure, as shown in FIG. 18 (d), near the annular mobile elements 31 the height of the distal end surface 38a first position (height from the suction surface 22 is the initial position of the H 0) and outputs a command to only lower second position the height H 1 from.
- the step surface forming mechanism driving unit 400 shown in FIG. 1 is driven to lower the peripheral annular moving element 31 as shown by the arrow 214 in FIG.
- Tip surface 38a of the peripheral annular mobile element 31 has a height from a first position (initial position) from the height H 1 by the lower, lower slightly than the suction surface 22 second position (attracting surface 22 (H 1 - H 0 ).
- control unit 150 holds the state from time t6 to time t7 as shown in FIG.
- the pressure of the opening 23 is in the second pressure P 2 close to atmospheric pressure, as shown in FIG. 11, the back surface 12b and a peripheral annular moving element of the dicing sheet 12 is located immediately above the gap d There is a gap between the tip 31 and the tip end surface 38a.
- Control unit 150 As shown in FIG. 18 (e), and outputs an instruction for switching the opening pressure at time t7 second from the pressure P 2 is close to the atmospheric pressure in the first pressure P 1 near vacuum.
- the drive unit 82 of the opening pressure switching mechanism 80 switches the three-way valve 81 so that the opening 23 and the vacuum device 140 communicate with each other.
- the opening pressure is the first pressure P 1 near vacuum.
- the semiconductor die 15 in a region facing the distal end surface 38a is returned toward the surface 18a of the collet 18 as shown by an arrow 224 shown in FIG. 13 come.
- the air leakage amount starts to decrease around time t8 in FIG. 18F, and when the semiconductor die 15 is vacuum-adsorbed to the surface 18a of the collet 18 as shown in FIG. , Return to almost zero.
- the region of the semiconductor die 15 facing the front end surface 38a is separated from the surface 12a of the dicing sheet 12. It should be noted that the region of the semiconductor die 15 facing the tip end surface 38a as shown by the arrow 217 in FIG. 12 is pulled from the dicing sheet 12 until it returns to the surface 18a of the collet 18 as shown by the arrow 224 in FIG.
- the time changes according to the releasability of the semiconductor die 15 and the dicing sheet 12.
- the control unit 150 becomes a time t9, the output a command to increase the opening pressure to the second pressure P 2 closer to the first pressure P 1 near vacuum to atmospheric pressure I do.
- the drive unit 82 of the opening pressure switching mechanism 80 switches the three-way valve 81 so that the opening 23 communicates with the pipe 85 that is open to the atmosphere.
- the air flows into opening 23, the pressure of the opening 23 at time t10 is increased to the second pressure P 2 close to atmospheric pressure. This causes the dicing sheet 12 immediately above the gap d to be displaced upward away from the distal end surface 38a of the peripheral annular moving element 31, as shown by the arrow 223 in FIG.
- the control unit 150 a distal end face 38b of the intermediate annular mobile element 40 to the first position (height position of H 0 from the suction surface 22) by a height H 1 from the lower second position a moving command, the distal end surface 38a of the peripheral annular mobile elements 31 in the second position, lower by H 2 -H 0 from the first position (initial position) height H 2 as low as third position from the (suction surface 22 Command to move to the position).
- the step surface forming mechanism driving unit 400 shown in FIG. 1 is driven to lower the intermediate annular moving element 40 as shown by the arrow 227 in FIG. 14 and to move the peripheral annular moving element 31 as shown by the arrow 226. Lower it.
- the first position by a lower second position the height H 1 from (higher position by the height H 0 from the suction surface) (lower from the suction surface 22 by H 1 -H 0 position) Go to the tip face 38a of the peripheral annular mobile element 31 is moved to the first position (initial position) only from a height H 2 lower third position (lower by H 2 -H 0 from the suction surface 22 position).
- the end surfaces 38a, 38b, and 47 are step surfaces having a step difference with each other, and at the same time, are step surfaces with respect to the suction surface 22.
- control unit 150 holds the state from time t10 to time t11 as shown in FIG. Then, the control unit 150 outputs an instruction to switch the opening pressure at a time t11 in FIG. 18 (e) second from the pressure P 2 is close to the atmospheric pressure in the first pressure P 1 near vacuum.
- the drive unit 82 of the opening pressure switching mechanism 80 switches the three-way valve 81 so that the opening 23 communicates with the vacuum device 140.
- the opening pressure is the first pressure P 1 near vacuum at time t12.
- the dicing sheet 12 has the distal end surface 38a of the peripheral annular moving element 31 descending to the third position and the intermediate annular moving element 40 descending to the second position. It is pulled toward the distal end surface 38b and displaced downward.
- the region of the semiconductor die 15 facing the tip surfaces 38a and 38b also bends downward and away from the surface 18a of the collet 18 as shown by an arrow 231 in FIG.
- an arrow 232 in FIG. 15 air flows into the suction hole 19 from between the surface 18 a of the collet 18 and the semiconductor die 15. The amount of air leaking into the suction hole 19 is detected by the flow sensor 106. As shown in FIG.
- the amount of air leak increases from time t11 when the opening pressure decreases to time t12. Then, in the vicinity of time t12 that the opening pressure reaches the first pressure P 1, the semiconductor die 15 in a region facing the distal end surface 38a, and 38b are towards the surface 18a of the collet 18 as shown by an arrow 244 shown in FIG. 16 Come back. As a result, the air leak amount starts to decrease around time t12 in FIG. 18F, and when the semiconductor die 15 is vacuum-adsorbed to the surface 18a of the collet 18 as shown in FIG. It becomes. The time required to return to the surface 18a of the collet 18 changes according to the releasability between the semiconductor die 15 and the dicing sheet 12.
- the control unit 150 outputs a command for switching to the time t13 the opening pressure from the first pressure P 1 closer to the vacuum in the second pressure P 2 close to atmospheric pressure.
- the drive unit 82 of the opening pressure switching mechanism 80 switches the three-way valve 81 so that the opening 23 communicates with the pipe 85 that is open to the atmosphere.
- the opening pressure is the second pressure P 2 closer to the atmosphere. In this state, although the semiconductor die 15 in the region corresponding to the tip end surface 47 of the columnar moving element 45 adheres to the dicing sheet 12 as shown in FIG. It is in a peeled state.
- the control unit 150 FIG. 18 at time t14, the columnar moving element 45 of the distal end surface 47 of the first position (attracting surface height from 22 the position of H 0) the height from H 1 by a lower second a command to move to a position, H 2 -H 0 the leading end surface 38b of the intermediate annular mobile element 40 from a first position (initial position) only from a height H 2 lower third position (suction surface 22 in the second position Command to move to a lower position).
- the step surface forming mechanism driving unit 400 shown in FIG. 1 is driven to lower the columnar moving element 45 as shown by the arrow 260 in FIG. 17 and to lower the intermediate annular moving element 40 as shown by the arrow 246. Let it.
- the distal end surface 47 of the columnar moving element 45 has a first position to move to a lower second position by the height H 1 from (position higher height H 0 from the suction surface), the distal end surface 38b of the intermediate annular mobile element 40, moves in the first position (initial position) only from a height H 2 lower third position.
- the semiconductor die 15 is in a state of being separated from the dicing sheet 12.
- the control unit 150 outputs a command to raise the collet 18 at time t15 in FIG.
- the collet driving section 130 shown in FIG. 1 drives the motor to raise the collet 18 as shown in FIG.
- the semiconductor die 15 is picked up while being attracted to the collet 18.
- the control unit 150 returns the tip surfaces 38a, 38b, 47 of the moving elements 31, 40, 45 to the first position at time t16, and the suction pressure switching mechanism 90 causes the stage 20 to be suctioned. switching the suction pressure of the surface 22 from the third pressure P 3 closer to the vacuum in the fourth pressure P 4 close to atmospheric pressure. This ends the pickup.
- the time t6 to t16 in FIG. 18 described above is the main peeling.
- this peeling sequentially from the outside of the mobile element 30 towards the inside of the moving element 30, the distal end surface is moved from the first position to the second position, the opening pressure first pressure P 1 and the second pressure P 2 By switching between the two, the region inside the peripheral portion of the semiconductor die 15 is peeled off from the surface 12 a of the dicing sheet 12.
- the opening pressure has been switched between the first pressure P 1 and the second pressure P 2, while holding the opening pressure to the first pressure close to a vacuum, the moving element 30 may be sequentially moved.
- the above-described peeling operation of FIG. 18 was performed by applying the parameter values of the respective peeling parameters defined at level 4 of the parameter table 160 of FIG. Specifically, the following peel parameter values were applied.
- “Was FSN4 1.
- the “collet waiting time”, which is the time from when the collet 18 lands on the semiconductor die 15 to when the semiconductor die 15 starts to be lifted, is set to WT4 710 ms.
- the parameter table 160 of FIG. 19 will be described in more detail.
- the parameter value of each peeling parameter in the parameter table 160 has the following tendency according to the change in the level value. As shown in FIG. 19, the number of “switching times of the opening pressure at the time of initial peeling” increases from level 1 to level 8. However, this does not mean that the number of times of switching always increases every time the level value changes, and the number of times of switching may be the same for a plurality of adjacent level values. This also applies to other peeling parameters, and does not mean that the parameter value changes each time the level value changes, and the parameter value may be the same at a plurality of adjacent level values.
- the “number of times of switching of the opening pressure during the main peeling” is increased from level 1 to level 8. Further, the “first pressure holding time” is made longer from level 1 to level 8. “Descent time interval between moving elements” has a longer time interval from level 1 to level 8.
- the “collet standby time” increases the time from level 1 to level 8.
- the “pickup time” changes each time the level value changes, and increases from level 1 to level 8.
- the “pickup time” is similar to the “collet standby time”, but in addition to the collet standby time, the time required for the collet 18 to descend from a predetermined position and land on the semiconductor die 15, It includes the time from the start of lifting to the rising to a predetermined position.
- the parameter table 160 in FIG. 19 can also be called a “condition table”, and the peeling parameter can be called a “pickup parameter”.
- the specific parameter values shown in FIG. 19 are merely examples, and it is obvious that other parameter values may be used.
- Level 8 is a level value to be associated with the semiconductor die 15 that is very difficult to peel.
- FIG. 20 shows the height of the collet 18, the position of the columnar moving element 45, the position of the intermediate annular moving element 40, the position of the peripheral annular moving element 31, the opening pressure of the opening 23, FIG.
- the “number of times of switching of the opening pressure at the time of initial peeling” is increased to four times (FSN8). Accordingly, even when the periphery of the semiconductor die 15 is difficult to peel from the dicing sheet 12, the periphery of the semiconductor die 15 can be sufficiently peeled from the dicing sheet 12. By switching the opening pressure many times, the dicing sheet 12 attached to the periphery of the semiconductor die 15 is shaken off, and it takes a long time, but the peeling can be surely performed. Further, in FIG. 20, the “holding time of the first pressure” (HT8) at the time of the initial peeling is set to 150 ms (see FIG. 19, and similarly, see FIG. .
- the “number of times of switching of the opening pressure at the time of the final peeling” is increased to four times (SSN8).
- SSN8 the “number of times of switching of the opening pressure at the time of the final peeling”
- the “first pressure holding time” (HT8) at the time of the main peeling is set to 150 ms to be longer. Accordingly, it is possible to promote that the region inside the periphery of the semiconductor die 15 is naturally peeled off from the dicing sheet 12.
- the “first pressure holding time” (HT8) is common between the initial peeling and the main peeling, but different “first pressure holding time” (HT8) are used for the initial peeling and the main peeling.
- the “first pressure holding time” may be defined in the parameter table 160.
- the plurality of "first Each of the "pressure holding times” may be defined in the parameter table 160, and their parameter values may be different from each other. For example, a plurality of “first pressure holding times” are arranged in the order of application in the peeling operation and defined in the parameter table 160.
- the “descent time interval between moving elements” is set to 450 ms to be longer. If the time from lowering the distal end surface 38a of the peripheral annular moving element 31 from the first position to the second position to lowering the distal end surface 38b of the intermediate annular moving element 40 from the first position to the second position is lengthened. In this way, it is possible to encourage the region of the semiconductor die 15 facing the distal end surface 38a of the peripheral annular moving element 31 to be spontaneously peeled off from the dicing sheet 12.
- the time from lowering the distal end surface 38b of the intermediate annular moving element 40 from the first position to the second position to lowering the distal end surface 47 of the columnar moving element 45 from the first position to the second position is longer. Then, the region of the semiconductor die 15 facing the distal end surface 38b of the intermediate annular moving element 40 can be encouraged to be naturally separated from the dicing sheet 12.
- the descent time interval between the peripheral annular moving element 31 and the intermediate annular moving element 40 may be different from the descent time interval between the intermediate annular moving element 40 and the columnar moving element 45.
- Each descent time interval is defined in the parameter table 160. As shown in FIG. 2, there are cases where the number of intermediate annular moving elements 40 and 41 is two or more.
- the intermediate annular moving element 40 on the outer peripheral side and the intermediate annular moving element 40 on the inner peripheral side are used. It descends toward the moving element 41 in order.
- the number of the intermediate annular moving elements 40 and 41 is two or more as described above, even if the descent time interval between the intermediate annular moving element 40 and another intermediate annular moving element 41 is specified in the parameter table 160, Good.
- the time from when the pickup operation is started (time t1 in FIG. 20) to when the peripheral annular moving element 31 (moving element 30 to be lowered first) is lowered from the first position to the second position is a parameter. It may be specified in the table 160.
- the “collet standby time” (WT8) is set to 1590 ms to be longer.
- the “pickup time” (PT8) is 1700 ms, which is longer.
- Level 1 is a level value to be associated with the semiconductor die 15 which is very easily peeled.
- FIG. 21 shows the height of the collet 18, the position of the columnar moving element 45, the position of the intermediate annular moving element 40, the position of the peripheral annular moving element 31, the opening pressure of the opening 23, FIG.
- the “first pressure holding time” (HT1) at the time of initial peeling is set to 100 ms, which is shortened.
- the semiconductor die 15 is easily separated from the dicing sheet 12
- the periphery of the semiconductor die 15 is sufficiently separated from the dicing sheet 12 even if the “first pressure holding time” is shortened.
- the time required for the peeling operation can be shortened.
- the “number of times of switching of the opening pressure during the final peeling” is reduced to one (SSN1).
- SSN1 the “number of times of switching of the opening pressure at the time of the final peeling”
- the area inside the periphery of the semiconductor die 15 is sufficiently peeled from the dicing sheet 12.
- the tip surfaces 38a, 38b, and 47 of the three moving elements 30 are simultaneously lowered from the first position to the second position or lower. Therefore, the “number of moving elements to be simultaneously lowered” has increased to three (DN1).
- the semiconductor die 15 is easily peeled off from the dicing sheet 12, even if the plurality of moving elements 30 are lowered at the same time, a region inside the periphery of the semiconductor die 15 is immediately peeled off from the dicing sheet 12.
- the “number of moving elements to be simultaneously lowered” is two.
- two separation parameters of “the number of moving elements to be lowered at the same time” and “descent time interval between moving elements” are defined.
- a descent time interval with the moving element 41 can be defined. In this case, in order to simultaneously lower the plurality of moving elements 30, one or more of these lowering time intervals are set to zero.
- the “collet standby time” (WT1) is set to 460 ms, which is shortened.
- the “pickup time” (PT1) is 570 ms, which is short.
- the parameter value of each peeling parameter is made different according to the level value, that is, the peeling operation (pickup operation) is made different.
- the semiconductor die 15 located at a position where it is difficult to peel off in one wafer is subjected to a peeling operation in association with a level value close to level 8, thereby suppressing damage to the semiconductor die 15 at the time of picking up and picking up mistakes. be able to.
- the pick-up can be performed in a short time by performing the peeling operation by associating the semiconductor die 15 at the position where the peeling is easy in one wafer with a level value close to the level 1.
- the plurality of level values can be said to be values indicating the length of time required for pickup.
- the parameter value of each peeling parameter can be referred to as “pickup condition”, and the parameter values of levels 1 to 8 of the same kind of peeling parameter (for example, “number of times of opening pressure switching at initial peeling”) are “pickup conditions”. Condition ". Further, the types of the peeling parameters shown in FIG. 19 can be defined as “types of pickup conditions”.
- FIG. 22 is an explanatory diagram of an identification number (die identification number, individual information) of each semiconductor die 15 of one wafer
- FIG. 23 is a diagram illustrating an example of a level table 159.
- an identification number composed of a position (X coordinate) in the X direction and a position (Y coordinate) in the Y direction of each semiconductor die 15 of one wafer 11 is associated with each semiconductor die 15. ing.
- the semiconductor die 15 located at the upper left of the wafer 11 has the position in the X direction “1” and the position in the Y direction “9”.
- the semiconductor die 15 to the right of the semiconductor die 15 is associated with the identification number “1-10”. I have.
- the level table 159 associates the identification numbers (die identification numbers, individual information) of the respective semiconductor dies with the level values. That is, the level table 159 associates each semiconductor die in one wafer with a level value which is an identifier of a parameter value (a plurality of pickup conditions) of a peeling parameter.
- a peeling operation according to the level value is associated with each semiconductor die 15 of one wafer.
- one pickup condition (parameter value) among a plurality of pickup conditions (parameter values of levels 1 to 8) in various peeling parameters, individual information (identification information) of the semiconductor die, and the like. Is defined.
- FIG. 24 is a diagram in which each semiconductor die 15 of one wafer is shaded or shaded according to the level value associated with each semiconductor die 15 according to the level table 159 of FIG.
- the ease of peeling may gradually increase from the semiconductor die 15 near the outer periphery to the semiconductor die 15 near the center of one wafer.
- the associated level value is reduced from the semiconductor die 15 near the outer periphery to the semiconductor die 15 near the center of the wafer (the peeling operation is simplified by simplifying the peeling operation). To take less time).
- FIG. 24 is a diagram in which each semiconductor die 15 of one wafer is shaded or shaded according to the level value associated with each semiconductor die 15 according to the level table 159 of FIG.
- a level 7 is associated with the outermost semiconductor die 15e (a hatched diagonally left hatched semiconductor die), and a semiconductor die 15d on the inner peripheral side of the semiconductor die 15e (a hatched diagonally right upper hatch).
- a level 6 is associated with the hatched semiconductor die, and a level 5 is assigned to the semiconductor die 15c on the inner peripheral side of the semiconductor die 15d (a dark gray semiconductor die).
- Level 4 is associated with the peripheral semiconductor die 15b (light gray semiconductor die), and level 3 is associated with the semiconductor die 15a near the center (white semiconductor die).
- FIGS. 25 to 27 and 30 to 35 described below the same shading or hatching as in FIG. 24 attached to each semiconductor die 15 or each semiconductor image (described later) is the same level value as each level value in FIG.
- FIGS. 25 to 27 show examples of the setting display screen 460.
- the control unit 150 displays the setting display screen 460 on the display unit 450 (display) by executing the setting display program 156 stored in the storage unit 152, and receives reading, generation, and updating of the level table 159.
- the control unit 150 displays the setting display screen 460 on the display unit 450 by functioning as a display control unit. Further, as described later, by executing the setting display program 156, an instruction for automatically acquiring the releasability of each semiconductor die 15 according to the position of each semiconductor die 15 on the wafer is received. As shown in FIG.
- the setting display screen 460 is a map image 480 simulating each semiconductor die of one wafer, and includes a map image 480 including a large number of semiconductor die images 482 and various operation buttons 468. Operation button group 464 and a level value button group 462 including buttons 466 of “level 1” to “level 8”.
- the operator or the like displays the map image 480 on the setting display screen 460.
- the correspondence defined in the level table 159 can be displayed. Specifically, the operator or the like moves the pointer 478 on the setting display screen 460 to the position of the “read” button 468 with the mouse (input unit 410) as shown in FIG. ). Thereby, the correspondence defined in the level table 159 is read, and the correspondence is displayed on the map image 480.
- each of the semiconductor die images 482 corresponding to each semiconductor die 15 is colored with a color corresponding to the level value associated with each semiconductor die 15.
- each semiconductor die image 482 is given a color corresponding to the level value.
- each semiconductor die image 482 of the map image 480 has at least a color, pattern, character, numeral, and symbol corresponding to the level value. One may be attached.
- the operator or the like can edit the level table 159 read out on the map image 480 of the setting display screen 460. This will be described after a method of newly generating the level table 159 is described.
- a mouse is used for moving the pointer 478 and selecting buttons, but a joystick or the like may be used.
- FIG. 26 is a diagram showing an example of the setting display screen 460 when a new level table 159 is generated.
- the setting display screen 460 becomes a new creation screen of the level table 159.
- a provisional level table 159 is created in which default level values are associated with all the semiconductor dies 15 on one wafer, and each semiconductor die image 482 of the map image 480 corresponds to the default level value. Colored.
- the default level value is level 3, and each semiconductor die image 482 is given a color (white) corresponding to level 3. From this state, the operator or the like associates a desired level value with each semiconductor die image 482, thereby associating a level value with the semiconductor die 15 corresponding to each semiconductor die image 482.
- the pointer 478 is moved to a button 466 of a desired level value (level 5 in FIG. 26), and the level value is selected by clicking the button 466. Then, as shown in FIG. 27, the pointer 478 is moved to the semiconductor die image 482b to which the selected level value is to be associated, and the semiconductor die image 482b is clicked. As a result, the selected level value is associated with the semiconductor die corresponding to the clicked semiconductor die image 482b. Further, a color corresponding to the selected level value is added to the semiconductor die image 482b.
- FIG. 27 shows a state in which, by clicking three semiconductor die images 482b, the semiconductor die images 482b are colored in accordance with the selected level 5.
- the operator or the like repeatedly creates or edits the level table 159 by repeating the selection of the level value and the selection of the semiconductor die image (semiconductor die) corresponding to the selected level value.
- the control unit 150 functions as a generation unit and receives the selection of the level value and the selection of the semiconductor die image (semiconductor die).
- the pointer 478 is moved to the “overwrite save” button 468 and the button 468 is clicked (selected) to create (create) the level table 159. finish.
- the control unit 150 functions as a generation unit and generates the level table 159.
- a file name is assigned to the level table 159 and stored in the storage unit 152 in order to identify each level table 159.
- a form in which the level table 159 is read from the storage unit 152 can be considered.
- a “Save as” button 468 is clicked with the pointer 478, a file name is assigned from the keyboard or the like of the input unit 410, and the level table 159 is stored in the storage unit 152.
- the control unit 150 functions as a generation unit and generates the level table 159.
- the "read” button 468 described above is clicked on with the pointer 478, a desired level table 159 is set and displayed by designating the file name of the level table 159 to be read from the plurality of level tables 159. It will be read on the screen 460.
- the operator or the like reads out the level table 159 on the setting display screen 460, that is, in a state in which each semiconductor die image 482 of the map image 480 is colored according to the level value, and performs a pickup execution button (not shown). Is pressed, the pickup of the semiconductor die 15 is started.
- the button for executing the pick-up can be a mode in which a button displayed on the screen is clicked with the mouse of the input unit 410, or a mode in which an operator or the like presses a physically existing button with the hand or finger.
- the control unit 150 executes the control program 155 stored in the storage unit 152 to pick up the semiconductor die 15. At this time, a peeling operation is performed on each semiconductor die 15 of each wafer according to the level table 159 read on the map image 480 of the setting display screen 460.
- the releasability of the semiconductor die 15 from the dicing sheet 12 can be detected from the time change (actual flow rate change) of the suction air flow rate of the collet 18 detected by the flow rate sensor 106.
- FIG. 28 is a diagram showing a time change between the opening pressure at the time of the initial peeling and the air leak amount (suction air flow rate) of the collet 18 detected by the flow rate sensor 106, and the meaning of each timing of t1, t2, t3, and t4. Has the same meaning as those timings shown in FIG.
- the solid line 157 in the graph of the amount of air leak in FIG. 28 is an expected flow rate change 157 which is a time change of the amount of air leak when the semiconductor die 15 is separated from the dicing sheet 12 in a good state (when the degree of easy separation is high).
- the expected flow rate change 157 is stored in the storage unit 152 in advance.
- the expected flow rate change 157 stored in the storage unit 152 is a set of a large number of suction air flow rates acquired in a predetermined sampling cycle, and is a suction rate corresponding to a large number of discrete times t.
- the air flow rate can be.
- the dashed line 158a and the two-dot chain line 158b in the graph of the air leak amount in FIG. 28 are examples of the actual flow rate change 158 which is a time change of the air leak amount detected when the semiconductor die 15 is actually picked up from the dicing sheet 12. It is.
- the actual flow rate change 158 is stored in the storage unit 152 each time the semiconductor die 15 is picked up.
- the actual flow rate change 158 stored in the storage unit 152 may be in a form that can be compared with the expected flow rate change 157.
- the actual flow rate change 158 And a set of suction air flow rates associated with a number of discrete times t.
- the actual flow rate change can be referred to as “actual flow rate information”, and the expected flow rate change can be referred to as “expected flow rate information”.
- the time t3 when the opening pressure begins to change toward the first pressure P 1 near vacuum the periphery of the semiconductor die 15 is the surface 18a of the collet 18 (See FIG. 8), but immediately the periphery of the semiconductor die 15 returns to the surface 18a of the collet 18 (see FIG. 9). Therefore, as in the expected flow rate change 157 in FIG. 28, the air leak amount starts to increase at time t3, but immediately starts decreasing (turns to decrease at time tr_exp). In the expected flow rate change 157, the increasing air leak amount is also small.
- the peeling property from the dicing sheet 12 of the semiconductor die 15 is bad (is low peeling easiness)
- opening the pressure at time t3 begins to change toward the first pressure P 1 near vacuum
- semiconductor The periphery of the die 15 is separated from the surface 18a of the collet 18 and after a certain period of time, the periphery of the semiconductor die 15 returns to the surface 18a of the collet 18. Therefore, as in the actual flow rate change 158a in FIG. 28, the air leak amount starts increasing at time t3, continues to increase, and then starts decreasing at time tr_rel later than time tr_exp. In the actual flow rate change 158a, the amount of air leak that increases is large.
- the actual flow rate change 158 is compared with the expected flow rate change 157, and it is determined that the more the actual flow rate change 158 is similar to the expected flow rate change 157, the better the peelability (the higher the ease of peeling). Alternatively, it is determined that the stronger the correlation between the actual flow rate change 158 and the expected flow rate change 157 is, the better the peelability is (the higher the ease of peeling is). In the present embodiment, the actual flow rate change 158 and the expected flow rate change 157 are compared, and their correlation values are obtained.
- the correlation value is a value of 0 to 1.0, and is set to 1.0 when the actual flow rate change 158 and the expected flow rate change 157 are completely coincident. to decide.
- the value range of the correlation value is 0 to 1.0, but it goes without saying that other values may be used.
- the period in which the actual flow rate change 158 is compared with the expected flow rate change 157 is, for example, a part of the initial separation period from time t1 (time at which air starts to be sucked from the surface 18a of the collet 18) to time tc_end in FIG. and (first time the opening pressure predetermined time has elapsed from the time t4 that has reached the first pressure P 1).
- a period to be compared may be a period of which is part time t3 (time opening pressure starts to change toward the first pressure P 1) ⁇ tc_end period initial peel. Further, the period to be compared can be another period.
- a value other than the correlation between the actual flow rate change 158 and the expected flow rate change 157 may be obtained as the releasability of the semiconductor die 15 from the dicing sheet 12. For example, it may be determined that the smaller the difference between the value of the expected flow rate change 157 at the time tc_end in FIG. 28 and the value of the actual flow rate change 158 at the same time, the better the peelability (the higher the ease of peeling). Also, for example, the smaller the difference between the time tr_exp at which the air leak flow rate at the expected flow rate change 157 changes from increasing to decreasing and the time tr_rel at which the air leak flow rate at the actual flow rate change 158 changes from increasing to decreasing.
- the peeling degree is high. Further, for example, the difference between the maximum value of the air leak flow rate of the expected flow rate change 157 detected after time t3 in FIG. 28 and the maximum value of the air leak flow rate of the actual flow rate change 158 detected after the same time is small. It may be determined that the higher the degree of ease of peeling, the higher the degree.
- the releasability of the semiconductor die 15 from the dicing sheet 12 without using the expected flow rate change 157. For example, it may be determined that the smaller the value of the actual flow rate change 158 at the time tc_end in FIG. 28, the better the peelability (the higher the ease of peeling).
- the above-described correlation value obtained based on the actual flow rate change 158 or an index value indicating the releasability of the semiconductor die 15 from the dicing sheet 12 instead of the correlation value may be referred to as an “evaluation value”.
- control unit 150 functions as a generation unit, acquires the actual flow rate change 158 every time the semiconductor die 15 is picked up, obtains a correlation value between the actual flow rate change 158 and the expected flow rate change 157, and obtains the actual flow rate change 158. 158 and the correlation value are stored in the storage unit 152.
- the control unit 150 (the generation unit) compares the correlation value with the threshold values TH1 and TH2 of each level value in the threshold value table 161 shown in FIG.
- FIG. 29 is an example of the threshold table 161.
- the threshold table 161 is a table stored in advance in the storage unit 152, and determines which level value should be applied to the semiconductor die 15 based on the correlation value. It is a table for doing. In the threshold table 161, the range of each level value is set by the lower threshold value TH 1 and the upper threshold value TH 2, and the lower the level value, the larger the threshold values TH 1 and TH 2.
- the range of level 4 is 0.81 (lower threshold TH1) to 0.85 (upper threshold TH2)
- the range of level 1 is 0.96 (lower threshold TH1) or more
- the range of level 8 Is equal to or less than 0.65 (upper threshold value TH2).
- the control unit 150 generation unit searches for which level value range the obtained correlation value belongs to, and acquires the level value to which the correlation value belongs. For example, if the obtained correlation value is 0.78, a level 5 (range: 0.76 to 0.80) is obtained. In this way, the control unit 150 acquires the level value to which the correlation value belongs from the threshold value table 161 each time each semiconductor die 15 of one wafer is picked up.
- control unit 150 associates the level value with the semiconductor die 15 (die identification number) for which the correlation value has been obtained. That is, the control unit 150 (generation unit) creates the level table 159. Then, based on the level table 159 that is gradually created, the control unit 150 gives each semiconductor die image 482 of the map image 480 a color according to the level value, as shown in FIG.
- the magnitude of the correlation value (degree of ease of peeling) of each semiconductor die 15 is represented in the map image 480 stepwise by the level value.
- an operator or the like can easily grasp which position of the semiconductor die has what degree of peeling ease.
- the level table 159 is created simply by clicking the "automatic acquisition" button 468, the level table 159 can be applied as it is when picking up each semiconductor die of a plurality of wafers thereafter. .
- An operator or the like can also automatically edit a level table 159 in which a level value is associated with each semiconductor die 15 as shown in FIG.
- each semiconductor die image 482 of the map image 480 is colored in accordance with the level value, but each semiconductor die image 482 changes more finely according to the magnitude of the correlation value (easiness of peeling). At least one of the following colors, patterns, characters, numbers, and symbols may be added.
- the semiconductor die pickup system 500 of the present embodiment has a mechanism that allows an operator or the like to grasp in detail the removability of each semiconductor die 15 of one wafer.
- a balloon 486 appears, and a semiconductor corresponding to the semiconductor die image 482c in which the pointer 478 is located in the balloon 486.
- the waveform of the actual flow rate change of the die 15 and the correlation value are displayed.
- the actual flow rate change is displayed by a solid line
- the expected flow rate change is also displayed by a broken line.
- each semiconductor die 15 As described above, since the actual flow rate change and the correlation value of each semiconductor die 15 are displayed on the setting display screen 460, the operator and the like can know the detachability of each semiconductor die 15 in detail.
- a correlation value of each semiconductor die 15 corresponding to each semiconductor die image 482 may be added to each semiconductor die image 482.
- the correlation value of the semiconductor die 15 corresponding to one or more specific semiconductor die images 482 may be displayed at a predetermined position on the setting display screen 460.
- each of the semiconductor dies 15 on one wafer and one of a plurality of pickup conditions (parameter values of levels 1 to 8) in various peeling parameters are selected. ) are stored in the storage unit 152 (level table 159 and parameter table 160). Then, when picking up each semiconductor die 15 of one wafer, the semiconductor die 15 is separated from the dicing sheet 12 according to the separation operation associated with each semiconductor die 15 by referring to the corresponding information and picked up. I do. Therefore, pickup can be performed by applying a peeling operation suitable for each semiconductor die 15 in one wafer. Further, according to the semiconductor die pickup system 500 described above, it is possible to grasp the releasability of each semiconductor die 15 according to the position of each semiconductor die 15 on one wafer.
- the setting display screen 460 is a screen for creating and updating the level table 159.
- each parameter value of the parameter table 160 (condition table) may be set on the setting display screen 460.
- a window 490 for setting parameter values is displayed on the setting display screen 460 so that parameter values can be set. Specifically, first, a button 466 of a level value for which a parameter value is to be set is selected (clicked) with the pointer 478, and then a “detailed setting” button 470 is clicked with the pointer 478. As a result, a window 490 for setting the parameter value of the peel parameter having the selected level value appears as shown in FIG.
- control unit 150 functions as a generation unit to receive the parameter value and update or generate the parameter table 160 by clicking the “Save” button 472. As described above, if each parameter value of the parameter table 160 can be changed and set on the setting display screen 460, the parameter value of the peeling parameter of each level value can be adjusted very easily.
- DAF Die Attachment Film
- the DAF functions as an adhesive between the semiconductor die 15 and the substrate when the semiconductor die 15 is die-bonded to the substrate after being picked up together with the semiconductor die 15 while being attached to the back surface of the semiconductor die 15. .
- the dicing sheet 12 is irradiated with ultraviolet rays in order to improve the releasability between the DAF attached to the back surface of the semiconductor die 15 and the dicing sheet 12. There is. Irradiation of ultraviolet light reduces the adhesive strength of the dicing sheet 12. Irradiation of the ultraviolet light may cause unevenness, and the releasability of each semiconductor die 15 may change depending on the position of each semiconductor die 15 on one wafer.
- each semiconductor die 15 Due to such factors, there are various patterns in the releasability of each semiconductor die 15 according to the position of each semiconductor die 15 on the wafer, and an operator or the like grasps the pattern and determines the appropriate pattern for each semiconductor die 15 of one wafer.
- Different level values For example, as shown in FIG. 33, the wafer is divided into two or more (four in FIG. 33) in the circumferential direction, and different level values correspond to the semiconductor dies 15a, 15b, 15c, and 15d belonging to each of the plurality of divided portions. It can be considered.
- the wafer is divided into two or more (six in FIG.
- the semiconductor dies 15a, 15b, 15c, 15d, 15e, 15f belonging to each of the plurality of divided portions can be associated with different level values.
- the correlation value between the actual flow rate change and the expected flow rate change was obtained as an index for grasping the detachability of the semiconductor die 15.
- the correlation value ranges from 0 to 1.0, and indicates that the larger the value, the easier the semiconductor die 15 is to peel off from the dicing sheet 12, which is the degree of ease of peeling.
- a value obtained by subtracting the correlation value from 1.0 takes a value of 0 to 1.0, and indicates that the larger the value, the more difficult it is for the semiconductor die 15 to separate from the dicing sheet 12. The degree of difficulty in peeling.
- the degree of difficulty in peeling can be used instead of the correlation value (easiness of peeling).
- the threshold value table 161 in FIG. 29 (the lower the threshold value, the larger the threshold value TH1, the lower the threshold value) is based on the correlation value (the peeling ease) and the value range of the correlation value (0 to 1.0).
- TH2 the threshold value table in which TH2 is set
- each semiconductor die 15 is associated with a level value.
- the threshold table 161 (the lower the threshold value, the smaller the threshold values TH1 and TH2 are set) based on the difficulty of peeling (1.0-correlation value) and the range of the value of the difficulty of peeling (0 to 1.0).
- a table may be used to associate a level value with each semiconductor die 15.
- the ease of peeling or the difficulty of peeling can also be referred to as the degree of peeling.
- the period in which the expected flow rate change 157 and the actual flow rate change 158 for obtaining the correlation value are compared is the predetermined period in the initial peeling.
- the period in which the expected flow rate change 157 and the actual flow rate change 158 are compared is the entire period of the initial peeling, the entire period of the main peeling, or a predetermined period in the main peeling, or a combination of the initial peeling and the main peeling.
- the expected flow rate change 157 is stored in the storage unit 152 in advance only during a period that is compared with the actual flow rate change 158.
- the parameter values are set such that the higher the level value, the greater the "number of times of suction pressure switching".
- a high level value is associated with the semiconductor die 15 having poor releasability so that the “number of times of switching of the suction pressure” is increased, thereby promoting the separation of the semiconductor die 15 from the dicing sheet 12.
- one control unit 150 functions as the pickup control unit 600, the generation unit 602, and the display control unit 604.
- the semiconductor die pickup system 500 includes two or more control units 150, for example, one control unit 150 functions as the pickup control unit 600, and another control unit 150 includes the generation unit 602 and the display control unit 604. It may function as.
- the semiconductor die pickup system 500 can also be called a semiconductor die pickup device.
- the semiconductor die pickup system 500 can be a part of a bonding apparatus (bonder, bonding system) or a die bonding apparatus (die bonder, die bonding system), and can also be referred to by their names.
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Abstract
Description
以下、図面を参照しながら本発明の実施形態の半導体ダイのピックアップシステムについて説明する。図1に示す様に、本実施形態の半導体ダイのピックアップシステム500は、半導体ダイ15が表面12aに貼り付けられたダイシングシート12を保持し、水平方向に移動するウェーハホルダ10と、ウェーハホルダ10の下面に配置され、ダイシングシート12の裏面12bを吸着する吸着面22を含むステージ20と、ステージ20の吸着面22に設けられた開口23の中に配置される複数の移動要素30と、吸着面22に対する段差面を形成する段差面形成機構300と、段差面形成機構300を駆動する段差面形成機構駆動部400と、半導体ダイ15をピックアップするコレット18と、ステージ20の開口23の圧力を切換える開口圧力切換機構80と、ステージ20の吸着面22の吸着圧力を切換える吸着圧力切換機構90と、コレット18の表面18aから空気を吸引する吸引機構100と、真空装置140と、ウェーハホルダ10を水平方向に駆動するウェーハホルダ水平方向駆動部110と、ステージ20を上下方向に駆動するステージ上下方向駆動部120と、コレット18を上下左右方向に駆動するコレット駆動部130と、半導体ダイのピックアップシステム500の制御を行う制御部150と、情報を入力するキーボードやマウス等である入力部410と、画面を表示するディスプレイである表示部450と、を備えている。
ここで、半導体ダイ15が貼り付けられたダイシングシート12をウェーハホルダ10にセットする工程について説明する。図3に示すように、ウェーハ11は裏面に粘着性のダイシングシート12が貼り付けられており、ダイシングシート12は金属製のリング13に取り付けられている。ウェーハ11はこのようにダイシングシート12を介して金属製のリング13に取り付けられた状態でハンドリングされる。そして、図4に示すように、ウェーハ11は切断工程で表面側からダイシングソーなどによって切断されて各半導体ダイ15となる。各半導体ダイ15の間にはダイシングの際に出来た切り込み隙間14が出来る。切り込み隙間14の深さは半導体ダイ15からダイシングシート12の一部にまで達しているが、ダイシングシート12は切断されておらず、各半導体ダイ15はダイシングシート12によって保持されている。
次に、半導体ダイ15のピックアップ動作について説明する。1枚のウェーハにおける各半導体ダイ15の位置に応じて、各半導体ダイ15のダイシングシート12からの剥離性が変化することがある。例えば、ウェーハにおける外周付近の半導体ダイ15から中心付近の半導体ダイ15に向かって、剥離容易度(剥離し易さ)が徐々に高くなっていることがある。これは、ダイシングシート12がウェーハホルダ10のエキスパンドリング16にセットされると、ダイシングシート12の中心付近が外周付近に比べて大きく引っ張られるため、ウェーハの中心付近の半導体ダイ15の剥離容易度がより高まると考えられる。このようなウェーハの半導体ダイ15の位置に応じた剥離性の傾向は、連続してピックアップを行う複数のウェーハで共通している場合が多い。複数のウェーハの半導体ダイ15を連続してピックアップする際に、剥離し易い位置にある半導体ダイ15には、簡易化された短時間の剥離動作(ピックアップ動作)を適用することでピックアップを高速化でき、一方で、剥離し難い位置にある半導体ダイ15には、長時間の剥離動作(ピックアップ動作)を適用することで半導体ダイ15の損傷やピックアップミスを抑制できる。そこで、本実施形態の半導体ダイのピックアップシステム500は、1枚のウェーハにおける半導体ダイ15ごとに、ピックアップの際の剥離動作を変更できるようになっている。
ここで、図19のパラメータテーブル160についてさらに詳しく説明する。パラメータテーブル160の各剥離パラメータのパラメータ値は、レベル値の変化に応じて次のような傾向を有している。図19に示す様に、「初期剥離時の開口圧力の切換回数」は、レベル1からレベル8に向かって数を多くしている。ただし、これはレベル値が変わるごとに必ず切換回数が多くなっていることを意味しておらず、隣接する複数のレベル値で切換回数が同じである場合がある。これは、他の剥離パラメータも同様であり、レベル値が変わるごとにパラメータ値が変化することを意味しておらず、隣接する複数のレベル値でパラメータ値が同じである場合がある。「本剥離時の開口圧力の切換回数」は、レベル1からレベル8に向かって数を多くしている。また、「第1圧力の保持時間」は、レベル1からレベル8に向かって時間を長くしている。「移動要素間の降下時間間隔」は、レベル1からレベル8に向かって時間間隔を長くしている。また、「コレット待機時間」は、レベル1からレベル8に向かって時間を長くしている。「ピックアップ時間」は、レベル値が変わるごとに変化し、レベル1からレベル8に向かって長くなる。なお、「ピックアップ時間」は、「コレット待機時間」と似ているが、コレット待機時間に加えて、コレット18を所定位置から降下させて半導体ダイ15に着地するまでの時間と、半導体ダイ15の持ち上げを開始してから所定位置まで上昇するまでの時間とを含む。なお、図19のパラメータテーブル160は、「条件テーブル」と言うこともでき、剥離パラメータは、「ピックアップパラメータ」と言うこともできる。図19に示されている具体的な各パラメータ値は、あくまで一例であり、他の値であってもよいことは当然である。
次に、レベルテーブル159について詳細に説明する。図22は、1枚のウェーハの各半導体ダイ15の識別番号(ダイ識別番号、個別情報)の説明図であり、図23は、レベルテーブル159の一例を示す図である。図22に示すように、1枚のウェーハ11の各半導体ダイ15のX方向の位置(X座標)とY方向の位置(Y座標)とからなる識別番号が、各半導体ダイ15に対応づけられている。例えば、ウェーハ11の最も左上にある半導体ダイ15は、X方向の位置が「1」でありY方向の位置が「9」であるため、識別番号「1-9」が対応づけられており、同様に、その半導体ダイ15の右隣の半導体ダイ15は、X方向の位置が「1」でありY方向の位置が「10」であるため、識別番号「1-10」が対応づけられている。
次に、オペレータ等がレベルテーブル159の生成や編集(更新)を行うための設定表示画面460について説明する。図25~27は、設定表示画面460の一例を示す図である。制御部150は、記憶部152に格納されている設定表示プログラム156を実行することで、表示部450(ディスプレイ)に設定表示画面460を表示し、レベルテーブル159の読み出し、生成、更新を受け付ける。制御部150は、表示制御手段として機能することで、表示部450に設定表示画面460を表示する。また、後述するように、設定表示プログラム156を実行することで、ウェーハの各半導体ダイ15の位置に応じた各半導体ダイ15の剥離性の自動取得の指示を受け付ける。図25に示すように、設定表示画面460は、1枚のウェーハの各半導体ダイを模したマップ画像480であり多数の半導体ダイ画像482からなるマップ画像480と、各種の操作用のボタン468からなる操作ボタン群464と、「レベル1」~「レベル8」の各ボタン466からなるレベル値ボタン群462とを有している。
次に、1枚のウェーハの各半導体ダイ15の剥離性の取得について説明する。オペレータ等は、ウェーハの各半導体ダイ15の位置に応じた各半導体ダイ15の剥離性(剥離し易さ、或いは、剥離し難さ)を把握することにより、各半導体ダイ15に対してより的確なレベル値を対応づけることができる。そこで、本実施形態の半導体ダイのピックアップシステム500は、ウェーハの各半導体ダイの位置に応じた各半導体ダイの剥離性を、自動で取得することが可能となっている。以下に、各半導体ダイ15の剥離性の自動取得について詳細に説明する。
まず、半導体ダイのピックアップシステム500が行う、半導体ダイ15のダイシングシート12からの剥離性の検出方法について説明する。半導体ダイ15のダイシングシート12からの剥離性は、流量センサ106が検出するコレット18の吸引空気流量の時間変化(実流量変化)から検出することができる。
)~時刻tc_end(最初に開口圧力が第1圧力P1に達した時刻t4から所定時間経過した時刻)とする。または、比較する期間は、初期剥離の期間の一部である時刻t3(開口圧力が第1圧力P1に向かって変化し始めた時刻)~tc_endの期間であってもよい。また、比較する期間は、その他の期間であることもできる。
次に、上記のようにして検出される半導体ダイ15のダイシングシート12からの剥離性を、設定表示画面460に表示する方法について説明する。オペレータ等は、1枚のウェーハの各半導体ダイ15の位置における各半導体ダイ15の剥離性を把握したい場合に、図30のように、ポインタ478により「自動取得」のボタン468をクリックする。それにより、制御部150は、記憶部152の制御プログラム155を実行して、1枚のウェーハの各半導体ダイ15を所定のレベル値の剥離動作(ピックアップ動作)でピックアップする。この際、制御部150は、生成手段として機能し、半導体ダイ15をピックアップするごとに、実流量変化158を取得し、実流量変化158と期待流量変化157との相関値を求め、実流量変化158と相関値とを記憶部152に格納する。
以上説明した半導体ダイのピックアップシステム500は、1枚のウェーハにおける各半導体ダイ15と、各種の剥離パラメータにおける複数のピックアップ条件(レベル1~8のパラメータ値)のうちの一つのピックアップ条件(パラメータ値)とを対応づけた対応情報(レベルテーブル159およびパラメータテーブル160)を記憶部152に記憶しておく。そして、1枚のウェーハの各半導体ダイ15をピックアップする際に、その対応情報を参照して、半導体ダイ15ごとに対応づけられた剥離動作にしたがって半導体ダイ15をダイシングシート12から剥離してピックアップを行う。そのため、1枚のウェーハにおける各半導体ダイ15に適した剥離動作を適用して、ピックアップを行うことができる。また、以上説明した半導体ダイのピックアップシステム500によれば、1枚のウェーハの各半導体ダイ15の位置に応じた各半導体ダイ15の剥離性を把握することができる。
以上説明した実施形態では、設定表示画面460は、レベルテーブル159の作成や更新などを行うための画面であった。しかし、設定表示画面460において、パラメータテーブル160(条件テーブル)の各パラメータ値の設定を行えてもよい。例えば、図32に示すように、パラメータ値の設定用のウィンドウ490を設定表示画面460に表示させて、パラメータ値の設定を行えるようにする。具体的には、まず、パラメータ値を設定したいレベル値のボタン466をポインタ478で選択(クリック)し、その後、「詳細設定」のボタン470をポインタ478でクリックする。それにより、図32のように選択したレベル値の剥離パラメータのパラメータ値設定用のウィンドウ490が現れる。そして、ウィンドウ490内の変更、または、新たに設定したいパラメータ値のテキストボックス492をポインタ478でクリックし、入力部410のキーボードからパラメータ値を入力する。そして、全てのパラメータ値の入力が終了したら、ウィンドウ490内の「保存」のボタン472をポインタ478でクリックする。これにより、選択したレベル値の剥離パラメータのパラメータ値が、変更または新たに設定される。このパラメータ値の受け付けと、「保存」のボタン472がクリックされることによるパラメータテーブル160の更新、或いは、生成は、制御部150が生成手段として機能して行う。このように、設定表示画面460においてパラメータテーブル160の各パラメータ値を変更、設定できれば、各レベル値の剥離パラメータのパラメータ値を非常に簡単に調整することができる。
以上、本発明の実施形態について説明したが、本発明はこうした実施形態に何等限定されるものではなく、本発明の要旨を逸脱しない範囲内において、種々なる形態で実施し得ることは勿論である。
Claims (14)
- ウェーハをダイシングした半導体ダイをダイシングシートから剥離してピックアップするピックアップシステムであって、
前記ダイシングシートから半導体ダイをピックアップするためのピックアップ条件に基づいて、ピックアップ動作を制御する制御手段と、
複数の前記ピックアップ条件のうちのいずれか一つの前記ピックアップ条件と、半導体ダイの個別情報とを対応づけた対応情報を生成する生成手段と、を備え、
前記制御手段は、
半導体ダイをピックアップする際に、半導体ダイごとに対応づけられた前記対応情報にしたがって半導体ダイを前記ダイシングシートからピックアップする制御を行う、
ことを特徴とする半導体ダイのピックアップシステム。 - 請求項1に記載の半導体ダイのピックアップシステムであって、
前記生成手段は、
1枚のウェーハにおける各半導体ダイと、複数の前記ピックアップ条件の識別子であるレベル値とを対応づけたレベルテーブルと、
複数の前記レベル値のいずれか一つと、前記ピックアップ条件のいずれか一つとを対応づけた条件テーブルと、を生成し、
前記対応情報は、前記レベルテーブルおよび前記条件テーブルにより定められる、
ことを特徴とする半導体ダイのピックアップシステム。 - 請求項2に記載の半導体ダイのピックアップシステムであって、
複数の前記レベル値は、ピックアップに要する時間の長短を示す値である、
ことを特徴とする半導体ダイのピックアップシステム。 - 請求項2または3に記載の半導体ダイのピックアップシステムであって、
画面を表示する表示部と、
表示制御手段と、を備え、
前記表示制御手段は、
前記表示部に、1枚のウェーハの各半導体ダイを模したマップ画像を表示し、
前記マップ画像において、前記レベル値が対応づけられた半導体ダイに対応する半導体ダイ画像に、レベル値に応じた色、模様、文字、数字および記号の少なくとも1つを付す、
ことを特徴とする半導体ダイのピックアップシステム。 - 請求項4に記載の半導体ダイのピックアップシステムであって、
情報を入力する入力部、を備え、
前記生成手段は、
前記入力部から、前記マップ画像上の1つ又は複数の半導体ダイ画像の選択と、複数の前記レベル値の中から1つのレベル値の選択とを受け付け、
選択された半導体ダイ画像に対応する半導体ダイに、選択されたレベル値を対応づけて、前記レベルテーブルを生成、または、更新する、
ことを特徴とする半導体ダイのピックアップシステム。 - 請求項4に記載の半導体ダイのピックアップシステムであって、
半導体ダイを吸着するコレットと、
前記コレットに接続され、前記コレットの表面から空気を吸引する吸引機構と、
前記吸引機構の吸引空気流量を検出する流量センサと、
半導体ダイの前記ダイシングシートからの剥離が良好な場合における、当該半導体ダイのピックアップの際の前記流量センサが検出する前記吸引空気流量の時間変化を示す期待流量情報を記憶した記憶部と、
を備え、
前記生成手段は、
1枚のウェーハにおける各半導体ダイをピックアップする際に、前記流量センサが検出する前記吸引空気流量の時間変化を示す実流量情報を取得し、
複数の半導体ダイのそれぞれの前記実流量情報と前記期待流量情報との相関値を求め、
複数の前記相関値のそれぞれに基づいて、複数の半導体ダイのそれぞれに前記レベル値を対応づけて、前記レベルテーブルを生成、または、更新する、
ことを特徴とする半導体ダイのピックアップシステム。 - 請求項6に記載の半導体ダイのピックアップシステムであって、
前記表示制御手段は、
前記表示部の前記マップ画像において、各半導体ダイ画像または各半導体ダイ画像の近傍に、各半導体ダイ画像に対応した各半導体ダイの前記相関値を表示し、または、
前記表示部において、特定の半導体ダイ画像に対応する半導体ダイの前記相関値を、画面上の所定位置に表示する、
ことを特徴とする半導体ダイのピックアップシステム。 - 請求項3に記載の半導体ダイのピックアップシステムであって、
前記レベルテーブルにおいて、1枚のウェーハの外周側から内周側に向かうにしたがって、各半導体ダイに、よりピックアップに要する時間が短いレベル値が対応づけられている、
ことを特徴とする半導体ダイのピックアップシステム。 - 請求項2または3に記載の半導体ダイのピックアップシステムであって、
前記ダイシングシートの裏面を吸着する吸着面を含むステージと、
前記ステージの前記吸着面に設けられた開口の開口圧力を真空に近い第1圧力と大気圧に近い第2圧力との間で切換える開口圧力切換機構と、
を備え、
前記制御手段は、半導体ダイをピックアップする際に、前記開口圧力を前記第1圧力と前記第2圧力との間で切換える制御を行い、
前記ピックアップ条件の種類には、前記開口圧力を前記第1圧力と前記第2圧力との間で切換える切換回数を含む、
ことを特徴とする半導体ダイのピックアップシステム。 - 請求項9に記載の半導体ダイのピックアップシステムであって、
前記ピックアップ条件の種類には、前記開口圧力を前記第1圧力に保持する保持時間を含む、
ことを特徴とする半導体ダイのピックアップシステム。 - 請求項9に記載の半導体ダイのピックアップシステムであって、
前記開口の中に配置され、先端面が前記吸着面より高い第1位置と前記第1位置より低い第2位置との間で移動する複数の移動要素を含み、前記吸着面に対する段差面を形成する段差面形成機構、を備え、
前記制御手段は、半導体ダイをピックアップする際に、複数の前記移動要素のそれぞれを所定時間の間隔で順に、又は、所定の前記移動要素の組合せで同時に前記第1位置から前記第2位置に移動させる制御を行い、
前記ピックアップ条件の種類には、前記所定時間を含む、
ことを特徴とする半導体ダイのピックアップシステム。 - 請求項11に記載の半導体ダイのピックアップシステムであって、
前記ピックアップ条件の種類には、同時に前記第1位置から前記第2位置に移動させる前記移動要素の数を含む、
ことを特徴とする半導体ダイのピックアップシステム。 - 請求項2または3に記載の半導体ダイのピックアップシステムであって、
半導体ダイを吸着するコレット、を備え、
前記ピックアップ条件の種類には、前記コレットが半導体ダイに着地してからその持ち上げを開始するまでの待機時間を含む、
ことを特徴とする半導体ダイのピックアップシステム。 - ダイシングシートの表面に貼り付けられた半導体ダイをピックアップする半導体ダイのピックアップシステムであって、
半導体ダイを吸着するコレットと、
前記コレットに接続され、前記コレットの表面から空気を吸引する吸引機構と、
前記吸引機構の吸引空気流量を検出する流量センサと、
ピックアップの際に、半導体ダイを前記ダイシングシートから剥離するための剥離動作を制御する制御部と、
画面を表示する表示部と、
を備え、
前記制御部は、
1枚のウェーハにおける各半導体ダイをピックアップする際に、前記流量センサが検出する前記吸引空気流量の時間変化である実流量変化を取得し、
複数の半導体ダイのそれぞれの前記実流量変化に基づいて、複数の半導体ダイのそれぞれの前記ダイシングシートからの剥離容易度または剥離困難度である剥離度を求め、
前記表示部に、1枚のウェーハの各半導体ダイを模したマップ画像を表示し、
前記マップ画像において、剥離度を求めた半導体ダイに対応する半導体ダイ画像に、当該半導体ダイの剥離度に応じた色、模様、文字、数字および記号の少なくとも1つを付す、
ことを特徴とする半導体ダイのピックアップシステム。
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CN201980044462.4A CN112368817B (zh) | 2018-07-06 | 2019-07-05 | 半导体裸片的拾取系统 |
JP2020529076A JP6883369B2 (ja) | 2018-07-06 | 2019-07-05 | 半導体ダイのピックアップシステム |
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CN112599467A (zh) * | 2020-12-15 | 2021-04-02 | 长江存储科技有限责任公司 | 裸片拾取方法及装置 |
JP7421412B2 (ja) | 2020-05-01 | 2024-01-24 | 株式会社Fuji | 吸着装置の状態判定装置 |
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WO2021241065A1 (ja) * | 2020-05-26 | 2021-12-02 | キヤノン株式会社 | 吸着機構、物品の製造装置、半導体製造装置 |
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TWI745710B (zh) | 2021-11-11 |
CN112368817B (zh) | 2024-03-12 |
KR102424153B1 (ko) | 2022-07-25 |
SG11202012864QA (en) | 2021-01-28 |
CN112368817A (zh) | 2021-02-12 |
TW202006836A (zh) | 2020-02-01 |
JP6883369B2 (ja) | 2021-06-09 |
JPWO2020009243A1 (ja) | 2021-02-15 |
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