Single chip electroplating power supply lap joint frame

Abstract

The invention discloses a single chip electroplating power supply lap joint frame which comprises a bottom frame and four side edge power connection blocks, a chip position used for placing a chip is arranged in the center area of the bottom frame, and the four side edge power connection blocks can be temporarily fixed to the periphery of the bottom frame and are attached to the four side edges of the chip respectively. The side face, close to the chip, of each side edge power connection block is a power connection face, power connection conductors are arranged on the power connection faces, the number and the positions of the power connection conductors correspond to the number and the positions of the pins on the side face of the close chip, each power connection conductor makes contact with the corresponding pin during temporary fixing, and all the power connection conductors are communicated with one pole of an electroplating power source during electroplating. The method has the advantages that all pins around the chip can be accurately electrified at the same time, so that the chip which can only be discarded originally can be utilized after being tinned again; operation and use are convenient and reliable.

Description

Technical Field

[0001] The invention relates to a single chip electroplating power supply bridge frame, belonging to the technical field of chip processing. Background Art

[0002] The QFN chip is placed on a substrate. During processing, multiple QFN chips are placed on a substrate with a larger area. After the injection and packaging are completed, they are cut to obtain individual chips.

[0003] There is an electroplating process in the chip processing process, the purpose of which is to tin the surface PAD and its heat sink. Currently, the industry often uses a whole row of frame-type QFN chips for electroplating, and the technology is relatively mature. However, QFN chips often have scratches, overflowing glue and other problems on the plating layer, which leads to defective products. After being sorted out, they cannot be recycled, resulting in a lot of waste.

[0004] The picked-out chip is a single chip after cutting. The single chip is a rectangular body, and the four sides of the chip are cut to expose a plurality of conductive pins connected to the PAD and its heat sink. Each pin is connected to a PAD and its heat sink.

[0005] In order to avoid waste, the applicant attempted to de-plating the selected individual chips (de-plating if there was overflow) and then re-tinning them. Since the individual chips are small in size, the exposed pins are small in diameter and numerous in number, it is very difficult to accurately connect all the pins at the same time during electroplating. Summary of the invention

[0006] The technical problem to be solved by the present invention is: how to accurately connect all the pins around the chip at the same time.

[0007] In view of the above problems, the technical solution proposed by the present invention is: A single chip electroplating power supply bridging frame comprises a base frame and four side power connection blocks. A chip position for placing a chip is provided in the central area of ​​the base frame. The four side power connection blocks can be temporarily fixed around the base frame and are respectively close to the four sides of the chip. The side of each side power connection block close to the chip is a power connection surface. The power connection surface is provided with power connection conductors whose number and position correspond to the number and position of pins on the side of the adjacent chip. When temporarily fixed, each power connection conductor contacts the corresponding pin. During electroplating, all power connection conductors are connected to one pole of the electroplating power supply.

[0008] An electric block circuit made of stainless steel is arranged on the side electric block, and all the electric conductors on one side electric block are connected in series to the same electric block circuit.

[0009] A chassis circuit made of stainless steel is arranged on the chassis. When the side power connection block is temporarily fixed on the chassis, each power block circuit can be in contact with the chassis circuit and energized.

[0010] The power connection conductor is a power connection post. A mounting hole is provided on the power connection surface of the side power connection block. A stainless steel spring 1 is provided at the inner end of the mounting hole. The power connection post is located in the mounting hole at the rear end and abuts against the stainless steel spring 1. When the side power connection block is temporarily fixed on the base frame, the power connection post obtains a forward elastic force by compressing the stainless steel spring 1 backward so that the front end is pressed against the corresponding pin. The stainless steel spring 1 is connected to the power block circuit.

[0011] A key slot is provided on the base frame corresponding to each side power connection block, and a one-way stop key whose front end can automatically pop up is provided in the key slot, and a stop key slot cooperating with the one-way stop key is provided on the lower bottom surface of each side power connection block. When the side power connection block is temporarily fixed to the base frame, the one-way stop key can pop up into the stop key slot, and the front side surface of the one-way stop key can abut against the front side wall of the stop key slot, so that the front end of the power connection column can be pressed tightly against the corresponding tube pin and prevent the side power connection block from retreating.

[0012] Axis holes are provided on both sides of the key slot, a stainless steel shaft penetrating on both sides is provided in the middle of the one-way stop key, the one-way stop key is installed in the shaft hole through the stainless steel shaft and can rotate around the stainless steel shaft, a mounting blind hole is provided at the front end of the bottom of the one-way stop key, a stainless steel spring 2 is provided in the mounting blind hole, the stainless steel spring 2 is exposed downward from the mounting blind hole, and the lower end is pressed on the bottom of the key slot.

[0013] The side electrical block is composed of an upper block and a lower block bonded together, and a conductive sheet made of stainless steel that can contact the one-way stop key is provided on the front side wall of the stop key slot, and the electrical block circuit is arranged between the upper block and the lower block and connected to the conductive sheet; the base frame is composed of an upper plate and a lower plate bonded together, and the dividing interface between the upper plate and the lower plate passes through the axis of the rotating shaft hole, and a circuit groove connecting all the key slots is provided on the lower plate, and a conductive sheet made of stainless steel pressed by a stainless steel spring is provided at the bottom of the front end of the key slot. The base frame circuit is arranged in the circuit groove and connects each conductive sheet, and the one-way stop key is made of stainless steel.

[0014] A hanging rack is arranged on the base frame, and a hanging ring is arranged on the top of the hanging rack. The base frame circuit extends upward to the inner side of the hanging ring and can be in contact with an external circuit to be energized when the hanging rack is hung.

[0015] Four dovetail-shaped plug-in slots are arranged on the chip position outer chassis. The side power block has a dovetail-shaped cross section corresponding to the plug-in slots. When temporarily fixed, the side power block is inserted into the plug-in slot.

[0016] The two side walls of the plug-in slot are respectively movable dovetail block 1 and dovetail block 2, and guide hole 1 and guide hole 2 are respectively provided on both sides of the plug-in slot. The inner sections of guide hole 1 and guide hole 2 are provided with telescopic springs made of stainless steel, and the outer sections of guide hole 1 and guide hole 2 are provided with telescopic guide columns. The dovetail block 1 and dovetail block 2 are respectively fixed to the guide columns on their sides and can slide left and right with their respective telescopic guide columns. Beneficial Effects

[0017] 1. It can accurately connect all the pins around the chip at the same time, so that the chips that were originally discarded can be used after re-tinning; 2. Easy to operate and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional schematic diagram of a single chip electroplating power supply bonding frame bonding a single chip as described in the first embodiment; Figure 2 It is a three-dimensional schematic diagram of a single chip described in Example 1; Figure 3 It is a schematic diagram of disassembling the lap joint frame described in Example 1; Figure 4 This is a bottom schematic diagram of the side connection block described in Example 1; Figure 5 It is a three-dimensional schematic diagram of the lower block of the side connection block described in Example 1; Figure 6 for Figure 2 A partial schematic diagram of Figure 7 It is a three-dimensional schematic diagram of the lower plate of the base frame described in Example 1; Figure 8 It is a three-dimensional schematic diagram of a part of the lower layer plate of the base frame and the one-way stop button according to the first embodiment; Fig. 9 A schematic diagram of the electric block circuit and its associated conductors described in Example 1; Fig.10 A schematic diagram of the chassis circuit and its associated conductors described in Example 1; Fig.11 It is a schematic diagram of disassembling the lap joint frame described in the second embodiment; Fig.12 for Fig.11 A partial schematic diagram of Fig.13 It is a three-dimensional schematic diagram of the dovetail block 1 and its associated components, a guide column and a telescopic spring.

[0019] In the figure: 1. chassis; 101. upper plate; 102. lower plate; 103. chip position; 104. key slot; 105. shaft hole; 106. circuit slot; 107. plug-in slot; 2. side power block; 201. upper block; 202. lower block; 203. key slot; 3. chassis circuit; 4. power block circuit; 5. one-way key; 501. stainless steel shaft; 6. power post; 7. stainless steel spring one; 8. conductive sheet one; 9. stainless steel spring two; 10. conductive sheet two; 11. hanger; 1101. hanging ring; 12. dovetail block one; 13. dovetail block two; 14. telescopic spring; 15. guide post; 16. chip; 1601. chip surface area; 17. pin; 18. external circuit. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with embodiments and drawings: Embodiment 1

[0021] like Figure 1 As shown in FIG. 3 , a single chip electroplating power supply bridging frame includes a base frame 1 and four side connection blocks 2. A chip position 103 for placing a chip 16 is provided in the central area of ​​the base frame 1. The four side connection blocks 2 can be temporarily fixed around the base frame 1 and are respectively close to the four sides of the chip 16. The side of each side connection block 2 close to the chip 16 is a connection surface. The connection surface is provided with connection conductors whose number and position correspond to the number and position of the pins 17 on the side of the adjacent chip 16. When temporarily fixed, each connection conductor contacts the corresponding pin 17. During electroplating, all the connection conductors are connected to one pole of the electroplating power supply and contact the corresponding pin 17 through all the connection conductors. In this way, all the pins 17 around the chip are powered, and then the PADs and heat sinks corresponding to the pins concentrated in the chip surface area 1601 are electroplated with tin, so that the chips that were originally discarded can be reused.

[0022] like Figure 3 , 5 As shown in FIGS. 6 and 9 , an electric block circuit 4 made of stainless steel is provided on the side electric block 2 , and all the electric conductors on a side electric block 2 are connected in series to the same electric block circuit 4 .

[0023] like Figure 3 , 7 As shown in , 8 and 10 , a chassis circuit 3 made of stainless steel material is provided on the chassis 1 , and when the side connecting block 2 is temporarily fixed on the chassis 1 , each electric block circuit 4 can contact with the chassis circuit 3 and be energized.

[0024] In this way, as long as the chassis circuit 3 is connected to one pole of the electroplating power supply, all the power conductors are energized.

[0025] Here, all the conductive materials in the technical solution of the present application are preferably made of stainless steel materials that are not easily tinned. If they are still slightly tinned after being used for a period of time, they can be de-plated and then used normally.

[0026] like Figure 3 , 5 As shown in , 6, the power conductor is a power post 6, and a mounting hole is provided on the power connection surface of the side power connection block 2. A stainless steel spring 7 is provided at the inner end of the mounting hole. The power post 6 is located in the mounting hole in the rear section and abuts against the stainless steel spring 7. When the side power connection block 2 is temporarily fixed on the base frame 1, the power post 6 obtains a forward elastic force by compressing the stainless steel spring 7 backward so that the front end is pressed against the corresponding pin 17, and the stainless steel spring 7 is connected to the power block circuit 4.

[0027] like Figure 3 , 4 As shown in Figures 7 and 8, a key slot 104 is provided on the base frame 1 corresponding to each side power connection block 2, and a one-way stop key 5 whose front end can automatically pop up is provided in the key slot 104, and a stop key slot 203 cooperating with the one-way stop key 5 is provided on the lower bottom surface of each side power connection block 2. When the side power connection block 2 is temporarily fixed to the base frame 1, the one-way stop key 5 can pop up into the stop key slot 203, and the front side surface of the one-way stop key 5 is pressed against the front side wall of the stop key slot 203, so that the front end of the power connection column 6 can be pressed tightly against the corresponding pin 17 and prevent the side power connection block 2 from retreating.

[0028] A shaft hole 105 is provided on both sides of the key slot 104, and a stainless steel shaft 501 passing through both sides is provided in the middle of the one-way stop button 5. The one-way stop button 5 is installed in the shaft hole 105 through the stainless steel shaft 501 and can rotate around the stainless steel shaft 501. A mounting blind hole is provided at the front end of the bottom of the one-way stop button 5, and a stainless steel spring 9 is provided in the mounting blind hole. The stainless steel spring 9 is exposed downward from the mounting blind hole, and the lower end is pressed on the bottom of the key slot 104. In this way, when not in use, the front end of the one-way stop button 5 is naturally pushed upward by the stainless steel spring 29. When the side power block 2 is temporarily fixed to the base frame 1, the side power block 2 can be pushed along the base frame toward the front of the chip 16. During the pushing process, the front end of the one-way stop button 5 is pressed downward into the key slot 104 by the bottom of the side power block 2. When the stop key slot 203 is located above the one-way stop button 5, the front end of the one-way stop button 5 is pushed up by the stainless steel spring 29 and enters the stop key slot 203, thereby preventing the side power block 2 from retreating.

[0029] like Figure 3 , 5As shown, the side electrical block 2 is composed of an upper block 201 and a lower block 202 that are glued together, and a conductive sheet 8 made of stainless steel that can contact the one-way stop key 5 is provided on the front side wall of the stop key slot 203, and the electrical block circuit 4 is arranged between the upper block 201 and the lower block 202 and connected to the conductive sheet 8.

[0030] like Figure 3 , 7 As shown in , 8, the chassis 1 is composed of an upper plate 101 and a lower plate 102 that are glued together. The boundary surface between the upper plate 101 and the lower plate 102 passes through the axis of the shaft hole 105. A circuit groove 106 connecting all the key grooves 104 is provided on the lower plate 102. A stainless steel conductive sheet 10 pressed by a stainless steel spring 9 is provided at the bottom of the front end of the key groove 104. The chassis circuit 3 is arranged in the circuit groove 106 and connected to each conductive sheet 10. The one-way stop button 5 is made of stainless steel.

[0031] The interface between the upper plate 101 and the lower plate 102 passes through the axis of the shaft hole 105 , that is, the shaft hole 105 is equally divided into two plate arc grooves from top to bottom, which is beneficial to the installation of the stainless steel shaft 501 .

[0032] The above arrangement is not only conducive to the installation of the stainless steel shaft 501 , but also conducive to the layout of the chassis circuit 3 and the electric block circuit 4 .

[0033] like Figure 1 , 7 As shown in FIG. 10 , a hanger 11 is provided on the base frame 1, and a hanging ring 1101 is provided at the top of the hanger 11. The base frame circuit 3 extends upward to the inside of the hanging ring 1101 and can be in contact with the external circuit 18 to be energized when the hanger 11 is hung.

[0034] like Figure 1 , 9 As shown in 10, in summary, the current path for the pin 17 to be energized in the present application is: external circuit 18-base circuit 3-conductive sheet 2 10-stainless steel spring 2 9-one-way stop button 5-conductive sheet 1 8-electric block circuit 4-stainless steel spring 1 7-electric connection post 6-pin 17.

[0035] like Figure 1 , 3 As shown, four dovetail-shaped insertion slots 107 are provided on the outer chassis 1 of the chip position 103, and the side connection block 2 has a dovetail-shaped section corresponding to the insertion slot 107. When temporarily fixed, the side connection block 2 is inserted into the insertion slot 107. In this way, the side connection block 2 inserted into the dovetail-shaped insertion slot 107 can be limited in the vertical direction and the left and right direction, and the one-way stop 5 implements the front and back direction limitation.

[0036] When the side power connection block 2 needs to be withdrawn, the tail of the one-way stop button 5 exposed outside the side of the chassis 1 can be lifted to press the front end of the one-way stop button 5 downward to release the retraction lock of the one-way stop button. Embodiment 2

[0037] like Fig.11 , 12 As shown in FIG. 13 , the difference from the first embodiment lies in that the two side walls of the plug-in slot 107 are respectively movable dovetail block 12 and dovetail block 2 13, and guide hole 1 and guide hole 2 are respectively provided on both sides of the plug-in slot 107, and telescopic springs 14 made of stainless steel are provided in the inner sections of the guide hole 1 and the guide hole 2, and telescopic guide columns 15 are provided in the outer sections of the guide hole 1 and the guide hole 2, and the dovetail block 12 and the dovetail block 2 13 are respectively fixed to the guide columns 15 on their sides and can slide left and right with their respective telescopic guide columns 15, so that the width of the plug-in slot 107 can be changed to adapt to the side connecting blocks 2 of different widths.

[0038] The above embodiments are only used to more clearly describe the present invention and cannot be regarded as limiting the protection scope of the present invention. Any modifications in equivalent forms should be regarded as falling within the protection scope of the present invention.

Claims

1. A single chip electroplating power supply bridge frame, characterized in that: The invention comprises a base frame (1) and four side connection blocks (2). A chip position (103) for placing a chip (16) is provided in the central area of ​​the base frame (1). The four side connection blocks (2) can be temporarily fixed around the base frame (1) and are respectively close to the four sides of the chip (16) placed in the chip position (103). The side of each side connection block (2) close to the chip (16) is a connection surface. The connection surface is provided with connection conductors whose number and position correspond to the number and position of the pins (17) on the side of the close chip (16). When temporarily fixed, each connection conductor contacts the corresponding pin (17). During electroplating, all the connection conductors are connected to one pole of the electroplating power supply.

2. The single chip electroplating power supply bridge according to claim 1, characterized in that: An electric block circuit (4) made of stainless steel is provided on the side electric block (2), and all the electric conductors on the side electric block (2) are connected in series on the same electric block circuit (4).

3. The single chip electroplating power supply bridge according to claim 2, characterized in that: A chassis circuit (3) made of stainless steel is provided on the chassis (1). When the side connection block (2) is temporarily fixed on the chassis (1), each electric block circuit (4) can be in contact with the chassis circuit (3) and energized.

4. The single chip electroplating power supply bridge according to claim 3, characterized in that: The power connection conductor is a power connection post (6), a mounting hole is provided on the power connection surface of the side power connection block (2), a stainless steel spring (7) is provided at the inner end of the mounting hole, the power connection post (6) is located in the mounting hole at the rear end and abuts against the stainless steel spring (7), when the side power connection block (2) is temporarily fixed on the base frame (1), the power connection post (6) is pressed against the corresponding pin (17) by the forward elastic force obtained by compressing the stainless steel spring (7) backward, and the stainless steel spring (7) is connected to the power block circuit (4).

5. The single chip electroplating power supply bridge according to claim 3 or 4, characterized in that: A key slot (104) is provided on the bottom frame (1) corresponding to each side power connection block (2), and a one-way stop button (5) whose front end can automatically bounce upward is provided in the key slot (104). A backstop keyway (203) cooperating with the one-way backstop keyway (5) is provided on the bottom surface of each side connection block (2); when the side connection block (2) and the base frame (1) are temporarily fixed, the one-way backstop keyway (5) can be ejected upward into the backstop keyway (203), and the front side surface of the one-way backstop keyway (5) abuts against the front side wall of the backstop keyway (203), so that the front end of the connection column (6) can be tightly pressed against the corresponding pin (17) and prevent the side connection block (2) from retreating.

6. The single chip electroplating power supply bridge according to claim 5, characterized in that: A rotation shaft hole (105) is provided on both sides of the key slot (104); a stainless steel rotation shaft (501) passing through both sides is provided in the middle of the one-way stop key (5); the one-way stop key (5) is installed in the rotation shaft hole (105) through the stainless steel rotation shaft (501) and can rotate around the stainless steel rotation shaft (501); a mounting blind hole is provided at the front end of the bottom of the one-way stop key (5); a stainless steel spring (9) is provided in the mounting blind hole; the stainless steel spring (9) protrudes downward from the mounting blind hole for a section, and the lower end of the stainless steel spring (9) is pressed on the bottom of the key slot (104).

7. The single chip electroplating power supply bridge according to claim 6, characterized in that: The side electrical connection block (2) is composed of an upper block (201) and a lower block (202) bonded together, a conductive sheet (8) made of stainless steel capable of contacting the one-way stop key (5) is provided on the front side wall of the stop key slot (203), and the electrical block circuit (4) is provided between the upper block (201) and the lower block (202) and connected to the conductive sheet (8); the bottom frame (1) is composed of an upper plate (101) and a lower plate (102) bonded together, the upper plate ( The interface between the upper plate (101) and the lower plate (102) passes through the axis of the rotating shaft hole (105); a circuit slot (106) connecting all the key slots (104) is provided on the lower plate (102); a conductive sheet (10) made of stainless steel and pressed by a stainless steel spring (9) is provided at the bottom of the front end of the key slot (104); the chassis circuit (3) is arranged in the circuit slot (106) and connected to each conductive sheet (10); and the one-way stop key (5) is made of stainless steel.

8. The single chip electroplating power supply bridge according to claim 6, characterized in that: A hanging rack (11) is provided on the base frame (1), and a hanging ring (1101) is provided at the top of the hanging rack (11). The base frame circuit (3) extends upward to the inside of the hanging ring (1101) and can be in contact with an external circuit (18) to be energized when the hanging rack (11) is hung.

9. The single chip electroplating power supply bridge according to claim 1, characterized in that: Four dovetail-shaped plug-in slots (107) are provided on the outer chassis (1) of the chip position (103); the side power connection block (2) has a dovetail-shaped cross section corresponding to the plug-in slots (107); when temporarily fixed, the side power connection block (2) is inserted into the plug-in slots (107).

10. The single chip electroplating power supply bridge according to claim 1, characterized in that: The two side walls of the plug-in slot (107) are respectively movable dovetail block 1 (12) and dovetail block 2 (13). Guide hole 1 and guide hole 2 are respectively provided on both sides of the plug-in slot (107). Stainless steel telescopic springs (14) are provided at the inner sections of the guide holes 1 and 2. Telescopic guide columns (15) are provided at the outer sections of the guide holes 1 and 2. The dovetail block 1 (12) and dovetail block 2 (13) are respectively fixed to the guide columns (15) on their respective sides and can slide left and right along with their respective telescopic guide columns (15).

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