Protective fine wire bonding chopper

Abstract

The utility model provides a protective fine wire bonding chopper, which comprises a chopper handle and a chopper head, the chopper head is fixed below the chopper handle, the side surface of the chopper head is provided with a wire inlet groove, the top wall and the bottom wall of the wire inlet groove are respectively provided with a groove, and the inner side wall of each groove is provided with a plurality of protection components for protecting metal wires; the protection type fine wire bonding chopper solves the problems that when a metal wire is heated and welded, a protection film falls off or is damaged, the metal wire is in direct contact with the end portion of the chopper head, the metal wire is not damaged, and the service life of the metal wire is prolonged. And during welding, large friction force can be generated, so that the metal wire is broken, and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of semiconductor packaging, in particular to a protective fine-wire bonding wedge. Background Art

[0002] Wire bonding is a technology that connects the circuit on the chip to the external pins, ensuring the electrical connection between the internal circuit of the chip and the external circuit board; when in use, wire bonding uses thin metal wires, heat, pressure, and ultrasonic energy to tightly weld the metal wires to the substrate pads, achieving electrical interconnection between the chip and the substrate and information exchange between chips. Under ideal control conditions, electron sharing or atomic diffusion will occur between the wires and the substrate, thereby achieving atomic-level bonding between the two metals;

[0003] Among them, the wedge is an important tool in the wire bonding process. Its structure and performance determine the flexibility, reliability and economy of bonding. However, during the bonding process, the existing wedge will extend along the wire hole to ensure the smoothness of bonding because the wire hole is at a certain angle to the horizontal plane.

[0004] The existing protective fine wire bonding splitter integrates a handle and a blade head, a heater is provided on the handle, a wire entry slot, a wire lead hole and a wire exit slot are provided on the blade head, and a bonding plate is provided on the blade head. The metal fine wire passes through the wire entry slot and the wire lead hole and reaches the bonding plate. When in use, the metal wire is melted through the bonding plate and then welded to the surface of the chip; however, when the existing splitter is in use, the edge of the blade head is protected by applying a protective film to reduce the friction and possible breakage of the metal wire when entering and exiting the splitter. In this way, the metal wire will be heated when welding. When the heated metal wire contacts the protective film, the adhesion of the protective film to the blade head will be reduced, so that the problem of the protective film falling off or being damaged is often found. When the protective film is damaged, the metal wire directly contacts the end of the blade head, and there will be greater friction during welding, resulting in the breakage of the metal wire.

[0005] Therefore, it is necessary to provide a new protective fine wire bonding cutter to solve the above technical problems. Utility Model Content

[0006] In order to solve the above technical problems, the utility model provides a protective fine wire bonding wedge.

[0007] The protective fine wire bonding wedge provided by the utility model comprises: a handle and a cutter head, wherein the cutter head is fixed below the handle, a wire entry groove is provided on the side of the cutter head, a groove is provided on the top wall and the bottom wall of the wire entry groove, and a plurality of protective components for protecting the metal wire are provided on the inner side wall of the groove;

[0008] Several of the protection components include a roller and a rotating shaft, one end of the rotating shaft rotates on the inner side wall of the groove, and the roller rotates in the groove through the rotating shaft.

[0009] Preferably, a plurality of protection components are relatively distributed in the groove.

[0010] Preferably, the front end face of the tool head includes a bonding surface and a non-bonding surface, and a bonding plate is fixed to the bonding surface.

[0011] Preferably, a wire lead hole is provided inside the cutter head, and a wire outlet groove is transversely provided inside the cutter head, wherein the wire outlet groove is adjacent to the wire lead hole and communicated with the wire lead hole.

[0012] Preferably, the surface of the metal wire is in contact with the surface of the roller and the bonding plate respectively.

[0013] Preferably, the surface of the tool handle is also provided with a micro heater for heating the bonding plate.

[0014] Preferably, the material of the knife handle and the knife head is one of cemented carbide, titanium alloy and ceramic.

[0015] Compared with the related art, the protective fine wire bonding wedge provided by the utility model has the following beneficial effects:

[0016] Grooves are provided on the top and bottom walls of the wire entry slot, and protective components are provided in the grooves to protect the surface of the metal wire. When the metal wire enters and exits the chopper, it first contacts the roller, at which time the roller rotates, and the friction is small, thereby avoiding direct contact between the metal wire and the end of the cutter head. This solves the problem that when the metal wire is heated and welded, the protective film falls off or is damaged, causing the metal wire to directly contact the end of the cutter head, resulting in greater friction during welding, causing the metal wire to break. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the overall structure of the protective fine-wire bonding wedge provided by the utility model;

[0018] Figure 2 A schematic diagram of the overall cross-sectional structure of the protective fine-wire bonding wedge provided by the utility model;

[0019] Figure 3 It is a schematic diagram of a partial cross-sectional structure of a cutter head;

[0020] Figure 4 It is a schematic diagram of the structure of the protection component;

[0021] Figure 5 Schematic diagram of the groove structure.

[0022] Numbers in the figure: 1, tool handle; 2, tool head; 21, wire entry slot; 211, groove; 22, lead hole; 23, wire exit slot; 24, bonding plate; 25, bonding surface; 26, non-bonding surface; 3, roller; 31, rotating shaft; 4, metal wire; 5, micro heater. DETAILED DESCRIPTION

[0023] The utility model is further described below in conjunction with the accompanying drawings and implementation modes.

[0024] Please refer to Figures 1 to 5 ,in, Figure 1 A schematic diagram of the overall structure of the protective fine-wire bonding wedge provided by the utility model; Figure 2 A schematic diagram of the overall cross-sectional structure of the protective fine-wire bonding wedge provided by the utility model; Figure 3 It is a schematic diagram of a partial cross-sectional structure of a cutter head; Figure 4 It is a schematic diagram of the structure of the protection component; Figure 5 Schematic diagram of the groove structure.

[0025] In the specific implementation process, Figures 1 to 5 As shown, it comprises a knife handle 1 and a knife head 2, the knife head 2 is fixed below the knife handle 1, a wire entry groove 21 is provided on the side of the knife head 2, a groove 211 is provided on the top wall and the bottom wall of the wire entry groove 21, and a plurality of protection components for protecting the metal wire 4 are provided on the inner side wall of the groove 211;

[0026] Specifically, the protection component mainly protects the metal wire 4 when it enters and exits the cleaver, so as to prevent the metal wire 4 from directly contacting the end of the cutter head 2, thereby preventing the metal wire from breaking.

[0027] Several protection components all include a roller 3 and a rotating shaft 31, one end of the rotating shaft 31 rotates on the inner side wall of the groove 211, and the roller 3 rotates in the groove 211 through the rotating shaft 31;

[0028] Specifically, when the metal wire 4 enters the wire entry groove 21, the metal wire 4 will first contact the surface of the roller 3, driving the roller 3 to rotate in the groove, thereby reducing the friction between the metal wire 4 and the end of the cutter head 2 when the metal wire 4 enters.

[0029] refer to Figures 1 to 3 As shown, several protection components are relatively distributed in the groove 211;

[0030] The front end surface of the cutter head 2 includes a bonding surface 25 and a non-bonding surface 26, and a bonding plate 24 is fixed to the bonding surface 25;

[0031] Specifically, the bonding plate 24 mainly heats and fuses the metal wire 4 to perform welding;

[0032] A lead-in hole 22 is provided inside the cutter head 2, and a lead-out groove 23 is laterally provided inside the cutter head 2. The lead-out groove 23 is adjacent to the lead-in hole 22 and communicates with the lead-in hole 22;

[0033] Specifically, the wire outlet groove 23 surrounds the metal wire 4, and the wire outlet groove 23 is adjacent to the wire lead hole 22 and is connected to the wire lead hole 22. At this time, the metal wire 4 enters the cutter head 2 through the wire entry groove 21, and then enters the bonding area through the wire lead hole 22 and the wire outlet groove 23. The metal wire 4 is surrounded in the wire outlet groove 23, thereby avoiding the problem of the metal wire 4 shaking during the bonding process and the situation where the surface of the metal wire 4 is scratched or cut.

[0034] refer to Figure 1 , Figure 4 , Figure 5 As shown, the surface of the metal wire 4 is respectively in contact with the surface of the roller 3 and the bonding plate 24;

[0035] The surface of the handle 1 is also provided with a micro heater 5 for heating the bonding plate 24;

[0036] Specifically, the micro heater 5 is electrically connected to the bonding plate 24;

[0037] The material of the knife handle 1 and the knife head 2 is one of hard alloy, titanium alloy and ceramic;

[0038] Specifically, when in use, since the wire entry groove 21 and the wire lead hole 22 are set obliquely, when the metal wire 4 is inserted, the surface of the metal wire 4 fits with the surface of the roller 3 .

[0039] The working principle provided by the utility model is as follows: when in use, the metal wire 4 can be inserted along the wire entry groove 21. At this time, the metal wire 4 contacts the roller 3 on the surface of the wire entry groove 21. Under the action of the rotating shaft 31, the roller 3 is driven to rotate, thereby reducing the friction between the metal wire 4 and the cutter head 2.

[0040] The circuits and controls involved in the present invention are all prior art and will not be described in detail here.

[0041] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A protective fine wire bonding wedge, characterized in that: The invention comprises a knife handle (1) and a knife head (2), wherein the knife head (2) is fixed below the knife handle (1), a wire entry groove (21) is provided on the side of the knife head (2), a groove (211) is provided on the top wall and the bottom wall of the wire entry groove (21), and a plurality of protective components for protecting the metal wire (4) are provided on the inner side wall of the groove (211); Several of the protection components include a roller (3) and a rotating shaft (31), one end of the rotating shaft (31) rotates on the inner side wall of the groove (211), and the roller (3) rotates in the groove (211) through the rotating shaft (31).

2. The protective fine wire bonding cutter according to claim 1, characterized in that: A plurality of protection components are relatively distributed in the groove (211).

3. The protective fine wire bonding cutter according to claim 2, characterized in that: The front end surface of the cutter head (2) comprises a bonding surface (25) and a non-bonding surface (26), and a bonding plate (24) is fixed to the bonding surface (25).

4. The protective fine wire bonding cutter according to claim 3, characterized in that: A wire lead hole (22) is provided inside the cutter head (2), and a wire outlet groove (23) is transversely provided inside the cutter head (2), wherein the wire outlet groove (23) is adjacent to the wire lead hole (22) and communicated with the wire lead hole (22).

5. The protective fine wire bonding cutter according to claim 4, characterized in that: The surface of the metal wire (4) is respectively in contact with the surface of the roller (3) and the bonding plate (24).

6. The protective fine wire bonding cutter according to claim 5, characterized in that: The surface of the knife handle (1) is also provided with a micro heater (5) for heating the bonding plate (24).

7. The protective fine wire bonding tool according to claim 6, characterized in that: The material of the knife handle (1) and the knife head (2) is one of hard alloy, titanium alloy and ceramic.

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