TW201413861A - Wafer holding device - Google Patents

Abstract

A wafer holding device is used for aligning and joining a first wafer and a second wafer and comprises a base, a platform, a fixture, a plurality of lifting bases, a plurality of fastening mechanisms and a transmission module. The fixture comprises a tray and a plurality of clamping members. The tray is provided for placing the first and second wafers. The clamping member could vertically passes through the tray and presses the surface of the second wafer and is mutually incorporated with the tray so as to fasten the first and second wafers. The lifting base can be vertically and movably disposed to the base and respectively leans against the clamping members to drive the clamping member for vertically moving. The fastening mechanisms are used for fastening the fixture. The transmission module comprises a power unit and a linkage mechanism connected to the lifting base. The linkage mechanism is controlled by the power unit to levelly move or rotate and drives the lifting base to smoothly ascend and descend in a vertical direction so that damage of the first and second wafers caused by the clamping member can be reduced.

Description

Wafer holding device

The present invention relates to a holding device, and more particularly to a wafer holding device for use in a wafer pre-bonding process.

Wafer bonding technology is a common wafer level packaging technology and has been widely used in the fabrication of microelectronic components, optoelectronic components, microelectromechanical components or communication components.

Before performing the wafer bonding technique described above, a wafer holding device is usually used for alignment between wafers. Referring to Figure 1, a conventional wafer holding device 91 for use in a wafer pre-bonding process is shown. The wafer holding device 91 includes a base 92, a stage 93, a fixture 95 for positioning the two wafers 94, two fixing mechanisms 96 for fixing the fixture 95, and two lifting seats 97. The jig 95 includes a retainer 951 and two retaining members 952 that are vertically movable to hold the stationary wafer 94. The lifting bases 97 are respectively located under the clamping members 952 and abut against the clamping members 952, and the clamping members 952 are vertically moved to press the clamping members 952 against or away from the surface of the wafer 94 to fix or release the lifting members 952. Wafer 94. However, the lifting seat 97 of the wafer holding device 91 uses a cylinder as a power source for lifting and lowering, and it is difficult to control the speed of vertical movement during lifting. Therefore, when the lifting seat 97 drives the clamping member 952 to move downward to sandwich the fixed wafer 94, the instantaneous positive force of the clamping member 952 acting on the surface of the wafer 94 is relatively large due to the faster vertical movement speed. (nearly 10 Newtons), it is easy to damage the wafer 94 and cause the wafer 94 to be cornered. This damage is more serious when the thickness of the wafer is thinner.

Accordingly, it is an object of the present invention to provide a wafer holding device that reduces wafer damage and wafer nicks.

The wafer holding device is configured to pre-engage a first wafer and a second wafer, and includes a base, a stage disposed on the base, and a removably disposed on the wafer a fixture of the stage, a plurality of lifting seats vertically movably disposed on the base, and a transmission module disposed on the base.

The jig includes a retaining plate and a plurality of clamping members. The tray is for stacking the first wafer and the second wafer from bottom to top. The clamping members are vertically movable to the holder and are pressed against the surface of the second wafer, and cooperate with the holder to fix the first wafer and the second wafer.

The lifting seats are respectively located under the clamping members and abut against the clamping members to drive the clamping members to move vertically.

The transmission module includes a power unit and a linkage mechanism respectively coupled to the power unit and the lifting base. The linkage mechanism is controlled to horizontally move or rotate relative to the base by the power unit, and drives the lifting seats to gently move up and down in the vertical direction.

Preferably, the lifting bases each include a protruding rod extending toward the linking mechanism; the linkage mechanism includes a moving seat movably disposed on the base, and a moving base coupled to the moving base to control the moving direction of the moving base The screw and a plurality of guiding plates disposed on the moving seat and corresponding to the position of the lifting seat respectively. The guiding plates are each formed with a corresponding protruding rod sliding therein The guiding grooves are inclined in the same direction and the height difference is formed at both ends. The screw controls the horizontal movement of the moving seat, so that the protruding rods of the lifting seats slide in the corresponding guiding grooves to drive the lifting blocks to vertically move up and control the vertical movement of the clamping members.

Further, the power unit is a motor or a rotating handle, and the motor or the rotating handle is coupled to the screw and controls the rotation of the screw.

On the other hand, the lifting bases may each include a vertically extending rack; and the linking mechanism includes a guiding rod and a plurality of sleeves disposed on the guiding rod and respectively meshing with the racks of the lifting blocks. a gear; the guide rod drives the gears to rotate, and the lifting blocks are vertically linked by the racks to control the vertical movement of the clamping members.

Preferably, the power unit is a motor or a rotating handle, and the motor or the rotating handle is coupled to the guide rod and controls the rotation of the guide rod.

More preferably, the wafer holding device further comprises a plurality of fixing mechanisms disposed on the base and respectively releasably contacting the jig, and the fixture is fixed to the fixture.

The effect of the invention is that the linkage mechanism of the transmission module moves or rotates in the horizontal direction, and drives the lifting seats to gently rise and lower in the vertical direction, thereby reducing the moment when the clamping members are in contact with the second wafer. Force to reduce the incidence of wafer damage and wafer notch.

The foregoing and other technical contents, features, and advantages of the present invention are described in the following detailed description of the preferred embodiments of the reference drawings. Will be clearly presented.

2 and 3 show a first preferred embodiment of the wafer holding device of the present invention. The wafer holding device is configured to pre-engage a first wafer 11 and a second wafer 12, and includes a base 2, a mounting table 3 disposed on the base 2, and a removably disposed The fixture 4 of the stage 3, two fixing mechanisms 5 disposed on opposite sides of the jig 4 for fixing the jig 4, and two vertically movably disposed on the base 2 and on opposite sides of the stage 3 The lifting base 6 and a transmission module 7 are disposed on the base 2 for driving the lifting and lowering of the lifting base 6 vertically.

The jig 4 includes a retainer 41 and two oppositely disposed gripping members 42. The retainer 41 is provided with the first wafer 11 and the second wafer 12 stacked from bottom to top for pre-engagement. The clamping members 42 are vertically movably shuttled to the retainer 41 and are respectively disposed corresponding to the position of the lifting base 6.

The fixing mechanism 5 is disposed on the base 2 and respectively abuts against the jig 4, and cooperates with the stage 3 to fix the jig 4. When the jig 4 is to be removed, the fixing mechanism 5 is controlled to be in a state of not contradicting the jig 4, and the fixing force to the jig 4 is released.

The lifting blocks 6 are respectively located under the clamping members 42 and respectively abut against the clamping members 42 to drive the clamping members 42 to move vertically, and respectively comprise a protruding rod extending toward the transmission module 7. 61.

The transmission module 7 includes a power unit 71 and a linkage mechanism 72 coupled to the power unit 71 and the lifting bases 6, respectively. The linkage mechanism 72 includes a moving seat 721 movably disposed on the base 2, a screw 722 connected to the moving base 721 to control the moving direction of the moving base 721, and two sets. The guide plates 723 are placed on the movable seat 721 and respectively correspond to the position of the lift base 6. The guiding plates 723 each form a guiding groove 724 for the corresponding protruding rod 61 to slide therein, and the guiding grooves 724 extend obliquely in the same direction and form a height difference at both ends.

Accordingly, the power unit 71 drives the screw 722 to rotate to control the movement of the movable seat 721 in the horizontal direction (the horizontal direction in FIG. 3), so that the protruding rods 61 of the lifting seats 6 slide in the corresponding guiding grooves 724. Since the guiding groove 724 has a height difference, by using the principle of the cam mechanism, when the moving seat 721 is moved to the right by the position shown in FIG. 3, the protruding rod 61 can be slid from the lower portion to the upper portion along the guiding groove 724. Thereby, the lifting seat 6 and the clamping member 42 are moved upward to move the clamping member 42 away from the surface of the retaining plate 41, thereby generating sufficient space for placing or removing the first wafer 11 and the second wafer 12. When the first wafer 11 and the second wafer 12 are placed on the retainer 41, when the movable seat 721 is moved back, the protruding rod 61 slides from a high position to a low position along the guiding groove 724, and can be lifted and lowered. The seat 6 and the clamping member 42 are slowly lowered to control the clamping members 42 to gently press against the surface of the second wafer 12 to hold the first wafer 11 and the second wafer 12, thereby avoiding the momentary positive Excessive force causes the wafer to break. The power unit 71 may be a rotating handle as shown in FIG. 3 or a motor as shown in FIG. 4, both of which have the function of providing power to rotate the screw 722, and can control the rotation speed of the screw 722.

According to the above arrangement, the embodiment can be designed such that the stroke of the lifting seat 6 in the vertical direction is 10 mm, and the screw 722 uses a ball screw with a pitch of 2 mm. This embodiment can hold the clamping member. 42 The instantaneous positive force acting on the surface of the second wafer 12 is reduced to 0.02 Newtons, and Can effectively reduce the occurrence of cracks or corners in the wafer as shown in Table 1. It should be noted, however, that the specifications of the lift base 6 and the screw 722 are for illustrative purposes only, and the scope of implementation of the present invention is not limited thereto.

Referring to FIG. 5, a second preferred embodiment of the wafer holding device 1 of the present invention is substantially the same as the first preferred embodiment, but the lifting base 6 of the second preferred embodiment is linked with Mechanism 72 is different from the first preferred embodiment.

Specifically, in the second preferred embodiment, the lifting blocks 6 each include a vertically extending rack 62. In addition, the linkage mechanism 72 includes a guide rod 725 and two gears 726 that are sleeved on the guide rods 725 and mesh with the racks 62 of the lift bases 6, respectively. Accordingly, the power unit 71 drives the guide rod 725 and the gears 726 to rotate, and the lifting bases 6 are vertically interlocked by the rack 62 to control the clamping members 42 to gently press against the second crystal. The surface of the circle 12 reduces the damage caused by clamping the wafer.

In summary, the lifting and lowering of the lifting base 6 and the clamping member 42 in the vertical direction through the transmission module 7 can reduce the instantaneous positive force when the clamping member 42 contacts the second wafer 12, thereby reducing wafer damage. Therefore, the wafer holding device 1 of the present invention can achieve the object of the present invention.

However, the above is only the preferred embodiment of the present invention. The scope of the present invention is not limited by the scope of the invention, and the equivalent equivalents and modifications of the scope of the invention and the scope of the invention are still within the scope of the invention.

1‧‧‧ wafer holding device

11‧‧‧First wafer

12‧‧‧second wafer

2‧‧‧Base

3‧‧‧ stage

4‧‧‧ fixture

41‧‧‧承盘

42‧‧‧Clamping parts

5‧‧‧Fixed institutions

6‧‧‧ Lifting seat

61‧‧‧Bumps

62‧‧‧ rack

7‧‧‧Drive Module

71‧‧‧Power unit

72‧‧‧ linkage agency

721‧‧‧Mobile seat

722‧‧‧ screw

723‧‧‧Guideboard

724‧‧‧ guiding slot

725‧‧‧guides

726‧‧‧ Gears

1 is a side view showing a conventional wafer holding device; FIG. 2 is a side view showing an embodiment of the wafer holding device of the present invention; and FIG. 3 is a perspective view showing the wafer holding device of the present invention. A first preferred embodiment of the lifting base and the transmission module; FIG. 4 is another embodiment of the first preferred embodiment; and FIG. 5 is a perspective view showing the lifting base and the transmission of the wafer holding device of the present invention A second preferred embodiment of the module.

1‧‧‧ wafer holding device

11‧‧‧First wafer

12‧‧‧second wafer

2‧‧‧Base

3‧‧‧ stage

4‧‧‧ fixture

41‧‧‧承盘

42‧‧‧Clamping parts

5‧‧‧Fixed institutions

6‧‧‧ Lifting seat

61‧‧‧Bumps

7‧‧‧Drive Module

71‧‧‧Power unit

72‧‧‧ linkage agency

721‧‧‧Mobile seat

722‧‧‧ screw

723‧‧‧Guideboard

724‧‧‧ guiding slot

Claims (6)

A wafer holding device for pre-engaging a first wafer and a second wafer, comprising: a pedestal; a loading platform disposed on the pedestal; and a fixture detachably disposed And a plurality of clamping members for stacking the first wafer and the second wafer from bottom to top, the clamping members are vertically movable The retaining plate can be pressed against the surface of the second wafer and cooperate with the retaining plate to fix the first wafer and the second wafer; a plurality of lifting blocks can be vertically disposed on the base The bases are respectively located under the clamping members and abut against the clamping members to drive the clamping members to move vertically; a transmission module is disposed on the base and includes a power unit and a separate portion An interlocking mechanism coupled to the power unit and the lifting bases, wherein the linking mechanism is horizontally moved or rotated relative to the base by the power unit, and drives the lifting blocks to gently move up and down in the vertical direction. The wafer holding device of claim 1, wherein the lifting bases each include a protruding rod extending toward the linking mechanism; the linkage mechanism includes a moving seat movably disposed on the base, a screw connected to the moving seat to control the moving direction of the moving seat and a plurality of guiding plates disposed on the moving seat and respectively corresponding to the position of the lifting seat, the guiding plates respectively forming a corresponding protruding rod a sliding guiding groove, the guiding grooves are inclined in the same direction and the height difference is formed at both ends; the screw controls the movement The horizontal movement of the seats causes the lifting rods of the lifting seats to slide in the corresponding guiding grooves to drive the lifting blocks to vertically move up and control the vertical movement of the clamping members. The wafer holding device of claim 2, wherein the power unit is a motor or a rotating handle, and the motor or the rotating handle is coupled to the screw and controls the screw to rotate. The wafer holding device of claim 1, wherein the lifting bases each include a vertically extending rack; the linking mechanism includes a guiding rod and a plurality of sleeves disposed on the guiding rod and respectively A gear that engages the racks of the lifting seat; the guiding rod drives the gears to rotate, and the lifting blocks are vertically linked by the racks to control the vertical movement of the clamping members. The wafer holding device of claim 4, wherein the power unit is a motor or a rotating handle, and the motor or the rotating handle is coupled to the guide rod and controls the rotation of the guide rod. The wafer holding device of claim 1, further comprising a plurality of fixing mechanisms disposed on the base and releasably contacting the jig respectively to cooperate with the stage Fix the fixture.