CN118263168A - Chip mounting device and stripping clamp - Google Patents

Abstract

The present disclosure provides a chip mounting apparatus capable of reducing cracks or chips of a bare chip at the time of picking up. The chip mounting apparatus includes a peeling unit that peels off a bare chip attached to a dicing tape formed of a heat-peelable adhesive sheet. The peeling means is provided with: a block which is abutted against a portion of the dicing tape to which the bare chip to be peeled is attached; a dome plate which is abutted against a part of the dicing tape, to which the bare chip to be peeled is not attached; and a heating device for heating the block to a temperature at which the dicing tape is peeled from the bare chip to be peeled.

Description

Chip mounting device and stripping clamp

The invention is a divisional application of the invention application of 2021, 3/19, 202110296227.5 and entitled "die attach apparatus, peeling jig, and method for manufacturing semiconductor device".

Technical Field

The present disclosure relates to a die attach apparatus that can be applied to a die attach apparatus that picks up a bare die attached to a heat-type release sheet, for example.

Background

In a chip mounter that mounts a semiconductor chip (hereinafter referred to as a bare chip) on a surface of a wiring board, a lead frame, or the like (hereinafter collectively referred to as a board), for example, a mounting operation (operation) is repeatedly performed in which the bare chip is carried onto the board by using a suction nozzle such as a collet to apply a pressing force thereto, and a bonding material is heated to mount the bare chip.

In a die mounting process performed by a die mounting apparatus such as a die mounter, there is a peeling process of peeling off bare chips separated from a semiconductor wafer (hereinafter referred to as a wafer) to which a dicing tape as an adhesive tape is attached. In the peeling step, the bare chips are pushed from the back surface of the dicing tape by pushing pins or blocks, peeled one by one from the dicing tape held in the bare chip supply portion, and transported onto the substrate by using an adsorption nozzle such as a collet.

In recent years, for the purpose of promoting high-density mounting of semiconductor devices, a package-on-package in which a plurality of bare chips are three-dimensionally mounted on a wiring substrate has been put to practical use, but in assembling such a package-on-package, bare chips processed to a thickness of about tens of μm are used.

Prior art literature

Patent literature

Patent document 1: JP 2012-4393A

Disclosure of Invention

However, if the bare chip is thinned, the rigidity of the bare chip becomes extremely low compared to the adhesive force of the dicing tape. Therefore, in the assembly process of the package using the very thin bare chip, when the bare chip divided by dicing is peeled from the adhesive tape and picked up, cracks or chipping are likely to occur in the bare chip.

The present disclosure provides a chip mounting device capable of reducing cracks or chipping of a bare chip at the time of picking up.

A representative summary of the present disclosure is briefly described as follows.

That is, the die attach apparatus includes a peeling unit that peels off the bare die attached to the dicing tape formed by the heat-peelable adhesive sheet. The peeling means is provided with: a block which is abutted against a portion of the dicing tape to which the bare chip to be peeled is attached; a dome plate which is abutted against a part of the dicing tape, to which the bare chip to be peeled is not attached; a heating device for heating the block to a temperature at which the dicing tape is peeled from the bare chip to be peeled; and a temperature sensor for measuring the temperature of the heating device; and a cooling unit for cooling the dome plate.

According to the present disclosure, cracks or chips of the bare chip can be reduced.

Drawings

Fig. 1 is a schematic plan view showing a chip mounter in the embodiment.

Fig. 2 is a diagram of the operations of the pick-up head and the mounting head when viewed from the arrow a direction in fig. 1.

Fig. 3 is a schematic cross-sectional view showing a main part of the bare chip supply part of fig. 1.

Fig. 4 is a top view illustrating the peeling jig of fig. 3.

FIG. 5 is a cross-sectional view A-A of the peel clamp of FIG. 4.

Fig. 6 is a time chart showing the peeling timing.

Fig. 7 is a flowchart illustrating a method of manufacturing a semiconductor device using the die bonder of fig. 1.

Fig. 8 is a cross-sectional view of the peeling jig in the first modification.

Fig. 9 is a cross-sectional view of a peeling jig in the second modification.

Fig. 10 is a cross-sectional view of a peeling jig in a third modification.

Fig. 11 is a diagram illustrating a peeling jig in fourth to seventh modifications.

Wherein reference numerals are as follows:

10: chip mounter

12: Wafer holding table

13: Stripping unit

101: Stripping clamp

102: Block and method for manufacturing the same

103: Heater (Heat treatment device)

108: Dome top

109: Circular top plate

16: Cutting belt

21: Pick-up head

D: bare chip

Detailed Description

Hereinafter, embodiments will be described with reference to the drawings. However, in the following description, the same reference numerals are given to the same components, and overlapping description may be omitted. In the drawings, for the sake of clarity of explanation, the width, thickness, shape, etc. of each portion are schematically shown in comparison with the actual embodiment, but the explanation of the present invention is not limited to this.

Fig. 1 is a schematic plan view showing a chip mounter in the embodiment. Fig. 2 is a diagram illustrating operations of the pick-up head and the mounting head when viewed from the arrow a direction in fig. 1.

The chip mounter 10 generally includes a die supply unit 1, a pickup unit 2, an intermediate stage unit 3, a mounting unit 4, a carrying unit 5, a substrate supply unit 6, a substrate carrying-out unit 7, and a control unit 8 for monitoring and controlling operations of the respective units, and the die supply unit 1 supplies a die D mounted on a substrate S. The Y-axis direction is the front-rear direction of the chip mounter 10, and the X-axis direction is the left-right direction. The bare chip supply portion 1 is disposed on the front side of the chip mounter 10, and the mounting portion 4 is disposed on the inner side (the far side). Here, one or a plurality of product regions (hereinafter referred to as package regions P) that eventually become one package are printed on the substrate S.

First, the bare chip supply unit 1 supplies a bare chip D mounted on a package region P of a substrate S. The bare chip supply unit 1 includes a wafer holding stage 12 that holds a wafer 11, and a peeling unit 13 shown by a broken line that peels the bare chip D from the wafer 11. The bare chip supply portion 1 moves in the XY direction by a driving mechanism, not shown, and moves the bare chip D to be picked up to the position of the peeling unit 13.

The pickup section 2 includes a pickup head 21 for picking up the bare chip D, a Y driving section 23 for moving the pickup head 21 in the Y direction, and driving sections, not shown, for lifting, rotating, and moving the collet 22 in the X direction. The pickup head 21 has a collet 22 (see also fig. 2) for holding the peeled bare chip D by suction at the tip, and picks up the bare chip D from the bare chip supply unit 1 and places it on the intermediate stage 31. The pickup head 21 has driving parts, not shown, for lifting and lowering the collet 22, rotating it, and moving it in the X direction.

The intermediate stage section 3 includes an intermediate stage 31 on which the bare chip D is temporarily mounted, and a stage recognition camera 32 for recognizing the bare chip D on the intermediate stage 31.

The mounting unit 4 picks up the bare chip D from the intermediate stage 31 and mounts it on the package region P of the substrate S carried, or mounts it so as to be stacked on the bare chip mounted on the package region P of the substrate S. The mounting section 4 includes a mounting head 41 having a collet 42 (see also fig. 2) for holding the bare chip D on the front end in a suction manner similar to the pickup head 21, a Y driving section 43 for moving the mounting head 41 in the Y axis direction, and a board recognition camera 44 for photographing a position recognition mark (not shown) of the package region P of the board S to recognize the mounting position. With this configuration, the mounting head 41 corrects the pickup position and posture based on the pickup data of the stage recognition camera 32, picks up the bare chip D from the intermediate stage 31, and mounts the bare chip D on the substrate based on the pickup data of the substrate recognition camera 44.

The carrying section 5 includes a substrate carrying claw 51 for carrying the substrate S while gripping the substrate S, and a carrying path 52 for moving the substrate S. The substrate S is moved by driving a nut, not shown, of the substrate conveyance claw 51 provided in the conveyance path 52 by a ball screw, not shown, provided along the conveyance path 52. With this configuration, the substrate S is moved from the substrate supply unit 6 to the mounting position along the conveyance path 52, and after mounting, is moved to the substrate carrying-out unit 7, and the substrate S is delivered to the substrate carrying-out unit 7.

The control device 8 includes a memory for storing a program (software) for monitoring and controlling operations of the respective parts of the chip mounter 10, and a Central Processing Unit (CPU) for executing the program stored in the memory.

Next, the structure of the bare chip supply portion 1 will be described with reference to fig. 3. Fig. 3 is a schematic cross-sectional view showing a main part of the bare chip supply part of fig. 1.

The bare chip supply section 1 has a wafer holding stage 12 that moves in the horizontal direction (XY axis direction) and a peeling unit 13 that moves in the up-down direction. The wafer holding stage 12 has an extension ring 15 for holding the wafer ring 14, and a support ring 17 for positioning a dicing tape 16, which is held by the wafer ring 14 and to which a plurality of bare chips D are bonded, in the horizontal direction. The peeling means 13 is disposed inside the support ring 17.

When pushing the die D, the die supply unit 1 lowers the extension ring 15 holding the wafer ring 14. As a result, the dicing tape 16 held by the wafer ring 14 is stretched, the pitch of the die D is increased, and the die D is peeled from the dicing tape 16 by the peeling means 13, thereby improving the pick-up property of the die D. In addition, an adhesive for bonding the die to the substrate is changed from a liquid state to a film state, and a film-like adhesive material called a Die Attach Film (DAF) 18 is attached between the wafer 11 and the dicing tape 16. In the wafer 11 having the die-attach film 18, dicing is performed on the wafer 11 and the die-attach film 18. Therefore, in the peeling step, the wafer 11 and the die attach film 18 are peeled from the dicing tape 16. In addition, the peeling step will be described later regardless of the presence of the die attach film 18.

As the dicing tape 16, a high-temperature releasable adhesive sheet whose adhesive force is lost at a set temperature or higher, or a low-temperature releasable adhesive sheet whose adhesive force is lost at a set temperature or lower is used. The high-temperature releasable adhesive sheet and the low-temperature releasable adhesive sheet are referred to herein as a temperature-sensitive adhesive sheet. As the dicing tape 16, for example, a heat-peelable sheet (high-temperature peelable pressure-sensitive adhesive sheet) which has an adhesive force at normal temperature and peels off when heated is used. As the heat-peelable sheets, for example, heat-peelable pressure-sensitive adhesive sheets (trade names "REVALPHA" (registered trademark), "REVACLEAN", manufactured by the above-mentioned japanese electric company, ltd.) having a heat-expandable layer containing a foaming agent such as heat-expandable microspheres are used. For example, the 90 ℃ type of "revlpha" is peeled from a substrate or the like by heating at 100 to 120 ℃ for 1 minute on a hot plate (hot plate). That is, when heating is performed by a hot plate, the hot plate temperature needs to be set slightly higher than the peeling temperature in order to set the surface temperature of the high-temperature peelable adhesive sheet (the temperature of the interface with the die-attach film 18) to the peeling temperature. In the case of using a high-temperature releasable adhesive sheet, the release is preferably performed at a temperature lower than the curing temperature (usually 150 ℃) of the die-attach film 18. In addition, the die-attach film 18 is cured at a predetermined temperature for a long time (about one hour), and when the heating time of the high-temperature releasable adhesive sheet is short, the release temperature of the high-temperature releasable adhesive sheet may be about the same as the curing temperature of the die-attach film 18. The dicing tape 16 preferably uses a substrate having a thickness thinner than usual (about 100 μm). The thickness of the dicing tape 16 is, for example, 50 to 80 μm. This can increase the following property to the block during adsorption.

Next, the structure of the peeling jig will be described with reference to fig. 4 and 5. Fig. 4 is a top view of the peel clamp of fig. 3. FIG. 5 is a cross-sectional view A-A of the peel clamp of FIG. 4.

The peeling unit 13 generally includes a peeling jig 101 and a driving mechanism (not shown) for lifting and lowering the peeling jig 101. As shown in fig. 4, the peeling jig 101 includes a block 102 for heating the dicing tape 16, a heater 103 for heating the block 102, a temperature sensor 104 for measuring the temperature of the heater 103, a cooling unit 105, a first suction unit 106, a second suction unit 107, a driving unit (not shown) for lifting and lowering the block 102, a cylindrical dome 108 for holding these mechanisms, and a dome plate 109 for capping the dome 108. The peeling jig 101 has a height of about 83mm and a diameter of about 32mm, for example.

The block 102 is fitted into the center portion of the upper portion of the peeling jig 101. The block 102 has a rectangular shape in plan view, and is substantially the same size as the planar shape of the bare chip D. The block 102 is made of a material having a high thermal conductivity such as aluminum nitride. The block 102 has a plurality of suction ports 102a penetrating in the vertical direction, and the suction ports 102a communicate with the hollow 106a of the first suction portion 106 provided below. The hollow 106a communicates with the pipe 106b, and is connected to a vacuum pump, which is a pressure reducing device not shown. When the upper surface of the peeling jig 101 is brought into contact with the back surface of the dicing tape 16 by raising the inside of each suction port 102a, the vacuum pump is used to decompress the back surface of the dicing tape 16 at the portion of the bare chip to be picked up, and the back surface of the dicing tape is brought into close contact with the upper surface of the block 102. The suction port 102a and the first suction portion 106 (the hollow 106a and the pipe 106 b) constitute a first vacuum path.

A heater 103 as a heat treatment device is provided in contact with the lower surface of the block 102. The heater 103 is provided with a temperature sensor 104, so that the temperature of the heater 103 and the block 102 can be controlled, and the block 102 can be heated to an arbitrary temperature.

The dome plate 109 has an opening that allows the block 102 to move up and down, and a plurality of grooves 109b that connect the plurality of suction ports 109a and the plurality of suction ports 109a are provided in the peripheral portion thereof. The suction port 109a communicates with the hollow 107a of the second suction portion 107 provided below. The hollow 107a is formed in a ring shape around the block 102. The hollow 107a communicates with the pipe 107b and is connected to the vacuum pump. When the upper surface of the peeling jig 101 is raised in each of the suction port 109a and the groove 109b to be brought into contact with the back surface of the dicing tape 16, the vacuum pump is used to reduce the pressure, and the back surface of the dicing tape 16 in a portion other than the bare chip to be picked up is brought into close contact with the upper surface of the dome plate 109. The suction port 109a and the second suction portion 107 (the hollow 107a and the pipe 107 b) constitute a second vacuum path. The second vacuum path is configured independently of the first vacuum path. That is, the second vacuum path can perform vacuum suction at a different timing from the first vacuum path, or vacuum suction at the same timing.

The cooling portion 105 is provided below the hollow 107a via a wall portion, and is configured by the hollow 105a provided annularly around the block 102, and a pipe 105b communicating with the hollow 105 a. The duct 105b is connected to a cooling gas supply device not shown. The cooling gas supplied to the cavity 105a is discharged to the outside of the cooling portion 105 through a gas discharge hole (not shown) provided in a wall portion forming the cavity 105 a. Thereby, heating of the peripheral bare chip accompanied by a temperature rise of the dome plate 109 due to heat from the block 102 can be prevented. The outer diameters of the pipes 105b, 106b, 107b are, for example, about 2.5 mm.

Since the heating of the peripheral bare chip due to the temperature rise of the dome plate 109 caused by the heat from the block 102 is prevented, a gap G is provided between the block 102 and the dome plate 109, and air insulation is performed. The width of the gap G is, for example, about 0.5 mm.

The height of the upper surface of the block 102 is configured to be lower than the height of the upper surface peripheral portion (dome plate 109) of the peeling jig 101 in the initial state (when the block 102 is not operated).

Next, a method of peeling the bare chip D from the dicing tape 16 using such a peeling jig 101 having the block 102 as described above will be described with reference to fig. 6. Fig. 6 is a time chart showing the peeling timing.

(Step 1)

First, the control unit 8 lowers the extension ring 15 of the wafer holding table 12 to press the wafer ring 14 adhered to the peripheral portion of the dicing tape 16 downward. In this manner, the dicing tape 16 is stretched in the horizontal direction by receiving a strong tension from the center portion toward the peripheral portion, and the pitch of the die D is widened.

(Step 2)

Next, as shown in fig. 3, the control unit 8 moves the wafer holding table 12 so that the center portion (block 102) of the peeling jig 101 is located directly below one bare chip D to be peeled (the bare chip D located at the center portion in the same figure), and moves the collet 22 to above the bare chip D. A suction port (not shown) for depressurizing the inside is provided on the bottom surface of the collet 22 supported by the pickup head 21, and only one bare chip D to be peeled can be selectively sucked and held.

(Step 3: STP 3)

Next, the control unit 8 lowers the upper surface of the block 102 to a state (initial state) slightly lower than the upper surface of the dome plate 109, and lifts the peeling jig 101 so that the upper surface thereof contacts the back surface of the dicing tape 16, and depressurizes the inside of the suction port 109a and the groove 109b of the dome plate 109. Thus, the dicing tape 16 under the other die D adjacent to the die D to be peeled is brought into close contact with the dome plate 109. At the same time, the control unit 8 gradually lowers the pickup head 21, and stops lowering until the collet 22 reaches a predetermined height from the bare chip D. The control unit 8 heats the surface temperature of the block 102 to the preheating temperature by the heater 103. The preheating temperature (Tp) is a temperature at which the dicing tape 16 is not peeled from the bare chip D, and is a temperature higher than the normal temperature at which heating is not performed, for example, 60 ℃. Thereafter, the heater 103 starts heating so that the surface temperature of the block 102 becomes the heating target temperature (Th). The heating target temperature (Th) is, for example, 120 ℃. The temperature sensor 104 is used to perform feedback control so as not to exceed the heating upper limit Temperature (TH). The upper heating limit Temperature (TH) is, for example, 130 ℃. The heating upper limit Temperature (TH), the heating target Temperature (TH), and the preheating temperature (Tp) are changed by the characteristics of the dicing tape.

(Step 4: STP 4)

When the surface temperature of the block 102 after the heating time (th) has risen to the heating target temperature, the control unit 8 raises the block 102 to the same height position as the upper surface of the dome plate 109, and decompresses the inside of the suction port 102a of the block 102. Thereby, the dicing tape 16 under the bare chip D to be peeled is brought into close contact with the upper surface of the block 102, and the dicing tape 16 is heated. After a predetermined time has elapsed after the block 102 has risen to a predetermined height, the control unit 8 gradually lowers the pickup head 21, and stops lowering when the collet 22 reaches the height of the bare chip D. The control unit 8 heats the block 102 at a predetermined temperature for a predetermined time by the heater 103.

(Step 5: STP 5)

Thereafter, the control section 8 stops the heating of the block 102 by the heater 103, and gradually lifts the pickup head 21 by sucking the bare chip D through the suction port of the collet 22. When the collet 22 is raised from the upper surface of the dome plate 109 to a predetermined height, the control unit 8 switches the raising speed to a high speed and raises the raising speed.

(Step 6: STP 6)

When the collet 22 of the pickup head 21 reaches a predetermined height (a descent control height) from the upper surface of the dome plate 109, the control unit 8 lowers the block 102, and stops the suction by the suction port 102a of the block 102 and the suction by the suction port 109a of the dome plate 109.

Next, a method for manufacturing a semiconductor device using a chip mounter according to an embodiment will be described with reference to fig. 7. Fig. 7 is a flowchart showing a method of manufacturing a semiconductor device using the chip mount of fig. 1.

(Wafer/substrate carry-in step: step S11)

The wafer ring 14 holding the dicing tape 16 to which the bare chips D separated from the wafer 11 are attached is stored in a wafer cassette (not shown), and carried into the die mounter 10. The control section 8 supplies the wafer ring 14 from the wafer cassette filled with the wafer ring 14 to the bare chip supply section 1. The substrate S is prepared and carried into the chip mounter 10. The control unit 8 mounts the substrate S on the substrate conveyance claw 51 by the substrate supply unit 6.

(Pickup step: step S12)

The control section 8 peels the bare chip D in the above manner, and picks up the peeled bare chip D from the wafer 11. Thereby, the die D peeled from the dicing tape 16 together with the die-attach film 18 is sucked, held, and conveyed to the next step by the collet 22 (step S13). Then, when the collet 22 for carrying the die D to the next step is returned to the die supply unit 1, the next die D is peeled from the dicing tape 16 in the above-described order, and thereafter, the die D is peeled from the dicing tape 16 one by one in the same order.

(Mounting step: step S13)

The control section 8 mounts the picked-up bare chip on the substrate S or stacks it on the bare chip already mounted. The control unit 8 mounts the bare chip D picked up from the wafer 11 on the intermediate stage 31, picks up the bare chip D again from the intermediate stage 31 by the mounting head 41, and mounts the bare chip D on the transported substrate S.

(Substrate carrying-out step: step S14)

The control section 8 takes out the substrate S on which the bare chip D is mounted from the substrate conveyance claws 51 by the substrate carrying-out section 7. The substrate S is carried out from the die mounter 10.

As described above, the bare chip D is mounted on the substrate S through the bare chip adhesive film 18, and is carried out from the die mounter. Thereafter, the electrode of the substrate S is electrically connected to the Au wire in the wire mounting step. Next, the substrate S on which the bare chip D is mounted is carried into the die mounter, the 2 nd bare chip D is stacked on the bare chip D mounted on the substrate S via the bare chip die-bonding film 18, and after being carried out from the die mounter, the substrate S is electrically connected to the electrode of the substrate S via an Au wire in the wire mounting step. The 2 nd die D is peeled off from the dicing tape 16 by the above method, and then transported and stacked on the die D in the die attaching step. After repeating the above steps a predetermined number of times, the substrate S is conveyed to a molding step, and the plurality of bare chips D and Au wires are sealed with a molding resin (not shown), thereby completing the package on package.

According to the embodiment, one or more of the following effects are provided.

(1) By heating with the block having the outline matching the die size, the heat transferred to the die (peripheral die) located in the periphery of the picked-up die (peeling target die) and the dicing tape under the peripheral die can be reduced. This can suppress the situation in which the peripheral bare chip is easily peeled off, and can reduce the possibility of breakage.

(2) By cooling the dome plate, the heat transferred to the peripheral bare chip and the dicing tape under the peripheral bare chip can be further reduced.

(3) Since heating is performed from the side opposite to the bare chip with the dicing tape therebetween, it is possible to prevent excessive heat from being transferred to the surface of the bare chip.

(4) By independently driving the dome plate and the block, the outer periphery of the bare chip to be peeled can be held without heating the bare chip to be peeled, and therefore, the bare chip to be peeled can be accurately aligned.

(5) Since the block is not pushed higher than the bare chip board, pickup can be performed with low stress. Thus, cracks or chipping of the bare chip can be reduced.

As described above, in assembling a stack package in which a plurality of bare chips are three-dimensionally mounted on a substrate, it is required to reduce the thickness of the bare chips to 20 μm or less in order to prevent an increase in the package thickness. On the other hand, the dicing tape has a thickness of about 100 μm, and therefore the dicing tape also has a thickness 4 to 5 times the thickness of the bare chip. If the bare chip is thinned, the rigidity of the bare chip becomes extremely low compared with the adhesive force of the dicing tape. Therefore, for example, in order to pick up a thin die of 20 μm or less, it is necessary to reduce the stress applied to the die (reduce the stress). If such a thin die is to be peeled from the dicing tape, the deformation of the die following the deformation of the dicing tape becomes more likely to occur significantly, but the die mounter of the present embodiment can reduce the damage of the die at the time of picking up the die from the dicing tape.

< Modification >

Representative modifications of several embodiments are exemplified below. In the following description of the modification, the same reference numerals as those of the above embodiment are used for the portions having the same configurations and functions as those described in the above embodiment. The description of the above embodiment is appropriately given to the extent that the description is not technically contradictory. In addition, some of the above embodiments and all or some of the plurality of modifications may be combined and applied as appropriate within a range where technical contradiction does not occur.

(First modification)

A peeling jig in the first modification will be described with reference to fig. 8. Fig. 8 is a cross-sectional view of the peeling jig in the first modification.

The peeling jig 201 in the first modification includes, instead of the heater 103 and the cooling unit 105 of the embodiment, a peltier element 210 as a semiconductor cooling/heating element that is provided in a ring shape between the block 102 and the dome plate 109 and generates a temperature difference by a flow of current. The peltier element 210 is a heat treatment device and is also a cooling unit. The upper surface of the peltier element 210 as a cooling surface is brought into contact with the dome plate 109, and the lower surface as a heat radiation surface is brought into contact with the block 102. Here, it is preferable that the lower surface of the peltier element 210 is fixed to the flat surface of the block 102 located below the hollow 107a of the second suction portion 107, and the block 102 is lifted up, so that the upper surface of the peltier element 210 is brought into contact with the lower surface of the wall portion constituting the hollow 107a of the second suction portion 107. This can heat the block 102 before the block 102 contacts the dicing tape 106.

According to the above configuration, the peltier element 210 cools the dome plate 109 and can heat the block 102. In addition, since the heat dissipation of the peltier element 210 can be used for heating the pushing block without requiring a cooling gas supply device or the like, compactness and high energy efficiency can be achieved.

In addition, when the temperature of the block 102 needs to be set to a higher temperature and the heating temperature is insufficient due to heat dissipation by the peltier element 210, the block 102 may be heated to the processing temperature by the heater 103 provided in the embodiment. In addition, in the case of using the low-temperature peelable dicing tape, the cooling of the block 102 and the heating of the dome plate 109 can be similarly realized by controlling the polarities of the supply currents of the wirings 210a and 210b of the peltier element 210 to be opposite.

(Second modification)

A peeling jig in the second modification will be described with reference to fig. 9. Fig. 9 is a cross-sectional view of a peeling jig in the second modification.

The peeling jig 301 according to the second modification example includes an infrared lamp 320 as a heat treatment device in the block 302, instead of the heater 103 according to the embodiment. The peeling jig 301 does not include the cooling unit 105 and the first suction unit 106 according to the embodiment. The block 302 has an opening 302a having a shape corresponding to the die D, and the infrared lamp 320 directly heats the dicing tape 16 without passing through the block 302. Thus, the portion under the picked-up bare chip D in the dicing tape 16 can be selectively heated, and the bare chip D can be peeled from the dicing tape 16 as in the embodiment.

The inner surface of the block 302 having the infrared lamp 320 built therein may be coated with the reflective material 302b by gold plating or aluminum vapor deposition having a high reflectivity with respect to infrared rays. This makes it possible to more effectively introduce infrared rays into the portion under the peeled bare chip in the dicing tape 16.

A plate 302c made of a material having high transmittance to infrared rays, such as quartz glass, may be provided in the opening 302a of the block 302. This makes it easier to pick up the bare chip D with the collet 22 while maintaining the flatness of the bare chip D.

(Third modification)

A peeling jig in a third modification will be described with reference to fig. 10. Fig. 10 is a cross-sectional view of a peeling jig in a third modification.

The third modification example has a laser irradiation unit 430 capable of arbitrarily changing the irradiated area or size, instead of the infrared lamp of the second modification example. The laser irradiation unit 430 as a heat treatment device has a condenser lens unit 430a, and heats the dicing tape 16 directly without via the block 402, as in the case of the infrared lamp 320 in the second modification. Here, the laser irradiation unit 430 is provided inside the block 402, and a laser source, not shown, is provided outside and is introduced into the laser irradiation unit 430 by an optical fiber 430b or the like. Thus, the laser light can be selectively irradiated to the portion below the picked-up bare chip D in the dicing tape 16, and the bare chip D can be peeled from the dicing tape 16 as in the embodiment.

Since the laser source and the laser irradiation unit 430 can arbitrarily change the size or irradiation time of the laser beam, the process conditions of the size or the process temperature of the bare chip as a semiconductor product can be changed freely according to the program, and the replacement of the peeling jig can be suppressed to the minimum. Further, since the energy can be selectively concentrated on only the irradiation region by the laser, the temperature rise of the dome plate 109 or the like outside the irradiation region can be suppressed to the minimum.

In addition, as in the second modification, a plate 402c made of a material such as quartz glass having a high transmittance to the laser light used may be provided in the opening 402a of the block 402. This makes it easier to pick up the bare chip D with the collet 22 while maintaining the flatness of the bare chip D.

(Fourth modification example to seventh modification example)

In the embodiment, the suction port 102a provided in the block 102 is arranged in the center in a plan view. In the fourth to seventh modifications, suction ports are provided in at least four corners of the quadrangle formed on the upper surface of the block 102a except for the center portion, that is, in regions outside the virtual circle or the virtual ellipse inscribed in the four sides of the quadrangle.

The peeling jigs in the fourth to seventh modifications will be described with reference to fig. 11. Fig. 11 is a diagram illustrating a peeling jig in fourth to seventh modifications. Fig. 11 (a) is a top view of a block of the peeling jig in the fourth modification. Fig. 11 (b) is a top view of a block of the peeling jig in the fifth modification. Fig. 11 (c) is a top view of a block of the peeling jig in the sixth modification. Fig. 11 (d) is a top view of a block of the peeling jig in the seventh modification.

In the fourth to seventh modifications, the block 102 in the embodiment changes the number, arrangement, or diameter of the plurality of suction openings 102a penetrating in the vertical direction, and more uniformly sucks the dicing tape 16 on the lower surface of the bare chip D, and more uniformly heats it.

As shown in fig. 11 (a), in the fourth modification, four suction ports 102a are provided in the center of the block 102, and one suction port 102a is provided at each of four corners. As in the embodiment, the suction port 102a is provided only in the center, and the suction effect can be achieved in the outer peripheral portion. The diameter of the suction port 102a is, for example, 0.8mm.

As shown in fig. 11 (b), in the fifth modification, the suction port 102a is disposed on the entire surface of the block 102. The entire bare chip D can be uniformly heated by uniformly adsorbing the bare chip D. Here, the Pitch (PT) of the suction ports 102a is, for example, 2mm. The diameter of the outermost suction port 102a is, for example, 0.6 to 0.8mm, and the diameter of the inner suction port 102a is, for example, 0.8mm. The distance (wall thickness W) between the outermost suction port 102a and the end of the block 102 is, for example, about 0.5 mm.

As shown in fig. 11 (c), in the sixth modification, a plurality of lead openings 102a and a plurality of grooves 102c connecting the plurality of lead openings 102a are provided in the block 102. By providing the grooves 102c, the gap between the suction ports 102a can be filled.

As shown in fig. 11 (d), in the seventh modification, the block 102 is constituted by a central portion 102d formed of a porous metal and a frame portion 102e surrounding the outer periphery of the central portion 102 d. Suction is performed from the air hole 102f formed in the central portion 102 d. The frame 102e prevents leakage from the side of the central portion 102 d. The bonding area with the bare chip can be ensured, and the whole surface adsorption can be performed.

The invention provided by the inventors of the present disclosure has been specifically described above based on the embodiments and the modifications, but the present disclosure is not limited to the embodiments and the modifications described above, and various modifications are naturally possible.

For example, in the embodiment, the height at which the collet picks up the bare chip is set to the bare chip surface height, but the bare chip surface height after foaming of the dicing tape may be set to wait, or the collet may be raised in accordance with the rise in the bare chip height due to foaming. A sensor may be provided in the pickup head to control the pressing load in real time so as to be constant by using the sensor.

In the embodiment, the block is heated by the preheating temperature (Tp) in advance, but the block may be directly heated to the heating target temperature (Th) without preheating.

In the embodiment, the temperature of the block is measured by a temperature sensor provided in the heater of the block, but the present invention is not limited thereto, and a dicing tape formed of a heated bare chip or a heat-peelable adhesive sheet may be directly measured by providing an infrared radiation temperature sensor or the like.

In the embodiment, the cooling gas is supplied to the hollow of the cooling portion, but the cooling liquid may be supplied. In this case, the cooling liquid is recovered through a pipe or the like.

In the embodiment, the example in which the high-temperature releasable adhesive tape is used as the dicing tape has been described, but the low-temperature releasable adhesive tape may be used. In this case, the heat treatment of the heater 103 and the cooling unit 105 is exchanged, the cooling unit is provided below the block 102, and the heating unit is provided below the dome plate.

In the embodiment, the example in which the collet is brought into contact with the bare chip during the heating of the block has been described, but the collet may not be brought into contact with the bare chip during the heating of the block. This prevents heat from escaping to the collet due to heat transfer from the bare chip.

In the third modification, the example was described in which the plate 402c made of a material having a high transmittance to the laser light is provided in the opening 402a of the block 402, but the opening 402a of the block 402 may be covered with a plate made of a material that generates heat by absorbing the laser light, and the dicing tape may be indirectly heated by heating the plate by irradiation with the laser light. In this case, it is preferable that a suction port similar to the suction port 102a of the embodiment is provided in the plate, and a suction portion similar to the first suction portion 106 of the embodiment is provided below the suction port.

In the embodiment, the die D on the dicing tape 16 is vacuum (reduced pressure) sucked and fixed by the suction port provided in the block 102, but the invention is not limited thereto, and for example, an electrostatic suction chuck structure block having a heater function may be used to suck the dicing tape 16 on the lower surface of the die D. Thus, the block does not need to be provided with a suction port or a groove for vacuum suction, and can be heated more uniformly.

In the embodiment, the example of using the die-bonding film has been described, but a preformed portion to which an adhesive is applied may be provided on a substrate instead of using the die-bonding film.

In the embodiment, the die mounter that picks up the die from the pick-up head for the die supply unit and mounts the die on the intermediate stage and mounts the die mounted on the intermediate stage on the substrate with the mounting head has been described, but the invention is not limited thereto, and the die mounter is applicable to a semiconductor manufacturing apparatus that picks up the die from the die supply unit.

For example, the present invention can be applied to a die mounter that mounts a die of a die supply unit on a substrate by a mounting head without using an intermediate stage and a pickup head. In this case, when the misalignment between the collet and the bare chip occurs, the misalignment of the bare chip can be recognized by a camera (under vision camera) or the like for attachment and decoration.

The present invention is applicable to a flip chip mounter that picks up a die from a die supply unit without an intermediate stage, rotates a die pick-up head upward, transfers the die to a mounting head, and mounts the die on a substrate with the mounting head.

The present invention is applicable to a chip sorting machine that mounts a die picked up from a pick-up head for a die supply unit on a tray or the like without an intermediate stage and a mounting head.

Claims (19)

1. A chip mounting device is characterized by comprising:

a wafer holding stage for holding a dicing tape formed of a temperature-sensitive adhesive sheet;

a peeling unit that peels off the bare chip attached to the dicing tape; and

Pick up the head of the bare chip peeled from the dicing tape,

The peeling means is provided with:

a block that is in contact with a portion of the dicing tape to which the bare chip to be peeled is attached;

A dome plate located at an outer periphery separated from the block and abutting a portion of the dicing tape to which the bare chip to be peeled is not attached; and

And a heat treatment device that is in contact with the lower surface of the block and that sets the block to a temperature at which the dicing tape is peeled from the bare chip to be peeled.

2. The chip mounter according to claim 1, wherein,

The heat treatment device is a heater for heating the block.

3. The chip mounter according to claim 1, wherein,

The cooling unit is provided with a semiconductor cooling/heating element provided below the dome plate, and cools the dome plate by cooling the semiconductor cooling/heating element.

4. The chip mounter according to claim 3, wherein,

The block is heated by heat dissipation of the semiconductor heat and cold element.

5. The chip mounter according to claim 1, wherein,

The heat treatment device is an infrared lamp provided in the block, and the infrared lamp irradiates heat to the dicing tape through an opening provided in the block.

6. The chip mounter according to claim 5, wherein,

The opening of the block is covered by a surface plate formed of an infrared transmitting material.

7. The chip mounter according to claim 1, wherein,

The heat treatment device is a laser irradiation unit provided in the block, and irradiates the dicing tape with laser light through an opening provided in the block.

8. The chip mounter according to claim 7, wherein,

The opening of the block is covered by a surface plate formed of a material that transmits the laser light.

9. The chip mounter according to claim 7, wherein,

The opening of the block is covered with a surface plate formed of a material that generates heat by absorbing the laser light, and the heat treatment device irradiates the laser light to heat the surface plate, indirectly heating the dicing tape.

10. The chip mounter according to any one of claims 1 to 4, wherein,

The peeling unit further includes:

A first vacuum path for depressurizing the suction port of the block; and

And a second vacuum path for independently depressurizing the suction port of the dome plate with respect to the first vacuum path.

11. The chip mounter according to any one of claims 1 to 9, wherein,

Also comprises a control part, wherein the control part is provided with a control part,

The control unit heats the block to a first predetermined temperature by the heat treatment device, and adsorbs the dicing tape by the suction port of the dome plate in a state where the upper surface of the block is lower than the upper surface of the dome plate.

12. The chip mounter according to claim 11, wherein,

The control unit heats the block to a second predetermined temperature by the heat treatment device, and causes the upper surface of the block to contact the dicing tape, thereby adsorbing the block through the suction port of the block.

13. The chip mounter according to claim 12, wherein,

The control unit sets the second predetermined temperature to a temperature higher than the first predetermined temperature.

14. The chip mounter according to claim 12, wherein,

The control unit sets the second predetermined temperature to the same temperature as the first predetermined temperature.

15. The chip mounter according to claim 13, wherein,

The control section picks up the bare chip of the peeling object from the heated dicing tape using the head.

16. The chip mounter according to claim 1, wherein,

The block has a shape in a plan view that matches the shape of the bare chip in a plan view.

17. The chip mounter according to claim 10, wherein,

In a plan view, a plurality of suction ports for the block are provided on the inner side of a virtual circle or a virtual ellipse inscribed on the four sides of the block, and a plurality of suction ports for the block are provided on the outer side of a virtual circle or a virtual ellipse inscribed on the four sides of the block.

18. A peeling jig for peeling a bare chip attached to a dicing tape formed of a temperature-sensitive adhesive sheet, the peeling jig being characterized in that,

The cylindrical dome is provided with:

a block that is in contact with a portion of the dicing tape to which the bare chip to be peeled is attached;

a dome plate located on an outer periphery separated from the block and abutting a portion of the dicing tape to which the bare chip to be peeled is not attached; and

And a heat treatment device that is in contact with the lower surface of the block and sets the block to a temperature at which the dicing tape is peeled from the bare chip to be peeled.

19. The stripping fixture as recited in claim 18, wherein,

The device further comprises:

a first vacuum path for depressurizing the suction port of the block; and

And a second vacuum path that is independent of the first vacuum path and that depressurizes the suction port of the dome plate.