Bonding wire pressing plate

Abstract

The utility model provides a bonding wire pressing plate, and particularly relates to the technical field of semiconductor processing, according to the bonding wire pressing plate provided by the utility model, a bonding wire window is provided with four slope surfaces which comprise inclined surfaces and vertical surfaces connected with the inclined surfaces, so that when a chopper of a bonding wire machine carries out reverse wire drawing radian in the bonding wire window, the bonding wire window is provided with the inclined surfaces and the vertical surfaces connected with the inclined surfaces; the situation that the chopper damages the pressing plate body can be avoided, the size of the bonding wire window can be properly changed, and the situation that the chopper damages the chip is further avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of semiconductor processing, in particular to a wire bonding pressing plate. Background Art

[0002] Wire bonding machines are mainly used for internal lead welding in the semiconductor device packaging process. When wire bonding, the die to be wire bonded is placed on the lead frame and sent to the heating block of the wire bonding machine through a conveyor belt. The pressing plate presses the lead frame and the heating block together, so that the lead frame is in a stable state during the wire bonding process, thereby ensuring that the solder joints are uniformly and stably stressed.

[0003] An existing wire bonding pressing plate, such as the one disclosed in Patent Application No. CN102581532A, includes a pressing plate body. The bottom of the pressing plate body is a material pressing surface. Installation parts for connecting with the machine table are respectively arranged on both sides of the pressing plate body. A wire bonding window is opened on the pressing plate body. A plurality of slitting ribs are arranged in parallel on the wire bonding window. The slitting ribs divide the wire bonding window into several welding areas. The slitting ribs extend along the surface of the material pressing surface to both sides and form convex ribs protruding from the material pressing surface. An accommodating area is jointly surrounded by two adjacent convex ribs and the material pressing surface. In the utility model, the wire bonding window is divided into several welding areas by slitting ribs. During ultrasonic welding, in a relatively small area, the acoustic resistance is large, the ultrasonic energy accumulates and the temperature rises quickly and is not easily released, improving the quality of ultrasonic welding; due to the setting of the convex ribs, the welding components are in the accommodating area jointly surrounded by two adjacent convex ribs and the material pressing surface, and the components are not easily damaged, and wire bonding is convenient, avoiding the phenomenon of poor wire bonding. Since the cross-section of the wire bonding window of this patent is trapezoidal, when operating products with a long wire arc and a large chip close to the edge of the frame pin, the pressing parts on both sides of the wire bonding window will press on the frame connecting rib, which is close to the edge of the pressing plate body. The trajectory of the reverse pulling wire arc when the bonding tool makes a wire bond will touch the edge of the pressing plate body, causing damage to the bonding tool. Summary of the Utility Model

[0004] In order to solve the problem that the bonding tool is prone to touch the pressing plate body during wire bonding, the utility model is realized through the following technical solutions:

[0005] The utility model provides a wire bonding pressing plate which includes a pressing plate body. The pressing plate body includes a wire bonding window arranged on the pressing plate body. Each of the four sides of the wire bonding window includes a slope surface. The slope surface includes an inclined surface that slopes downward from the outside of the pressing plate body to the inside and a vertical surface that is perpendicular to the pressing plate body and is connected to the inclined surface. A pressing surface is arranged at the bottom of the pressing plate body and corresponds to the wire bonding window.

[0006] Further, the pressing plate body further includes installation parts arranged on both sides of the pressing plate body. The installation parts extend outward from the pressing plate body.

[0007] Further, a plurality of protruding portions are provided at the bottom of the pressing plate body near both sides of the wire bonding window, and the protruding portions face the bottom side.

[0008] Further, the pressing plate body further includes reinforcing portions on both sides of the bottom. The reinforcing portions extend downward from the pressing plate body and are at a certain distance from one side of the bottom of the wire bonding window.

[0009] Advantages of the present utility model:

[0010] (1) By setting the four slopes of the wire bonding window of the wire bonding pressing plate proposed by the present utility model into inclined surfaces and connected vertical surfaces, when the bonding tool of the wire bonder performs a reverse wire pulling arc in the wire bonding window, it can avoid the situation that the bonding tool damages the pressing plate body, and the size of the wire bonding window can be appropriately changed to further avoid the situation that the bonding tool damages the chip.

[0011] (2) By arranging the reinforcing portions and the protruding portions at the bottom of the wire bonding pressing plate proposed by the present utility model, the reinforcing portions are at a certain distance from the pressing surface at the bottom of the wire bonding window, and the protruding portions perform point pressing on the lead frame. Compared with the traditional wire bonding pressing plate that uses the edge of the pressing plate for wire pressing, it can avoid the situation that the wire bonding wire of some products is crushed by the pressing surface of the pressing plate body. Description of the drawings

[0012] Figure 1 is the overall view of the wire bonding pressing plate of the present utility model;

[0013] Figure 2 is the cross-sectional view of the wire bonding pressing plate of the present utility model in the A direction;

[0014] Figure 3 is the cross-sectional view of the wire bonding pressing plate of the present utility model in the B direction;

[0015] In the figure: pressing plate 1, wire bonding window 11, slope 111, protruding portion 12, mounting portion 13, reinforcing portion 14;

[0016] The realization, functional characteristics and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0017] In order to more clearly and completely illustrate the technical solution of the present utility model, the present utility model will be further described below with reference to the accompanying drawings.

[0018] Please refer to Figures 1 - 3The utility model proposes a welding wire pressing plate 1 including a pressing plate 1 body, the pressing plate 1 body including a welding wire window 11 arranged on the pressing plate 1 body, the four sides of the welding wire window 11 each include a slope 111, the slope 111 includes an inclined surface inclined inwardly and downwardly from the outer side of the pressing plate 1 body and a vertical surface connected with the inclined surface and perpendicular to the pressing plate 1 body.

[0019] In a specific embodiment, the wire bonding window 11 is square and is arranged in the middle of the pressing plate 1 body. The wire bonding window 11 has four slopes 111, and the cross-section of the slope 111 includes an inclined surface and a vertical surface, so that when the splitting knife of the wire bonding machine performs a reverse wire pulling arc in the wire bonding window 11, it can avoid the splitting knife from causing damage to the pressing plate 1 body. The size of the wire bonding window 11 can also be appropriately changed to further avoid the splitting knife from causing damage to the chip.

[0020] Furthermore, the main body of the pressing plate 1 further includes mounting portions 13 disposed on both sides of the main body of the pressing plate 1 , and the mounting portions 13 extend outward from the main body of the pressing plate 1 .

[0021] In a specific embodiment, the mounting portion 13 is used to mount and fix the body of the pressing plate 1 to prevent the body of the pressing plate 1 from moving during wire welding.

[0022] Furthermore, a plurality of protrusions 12 are provided at the bottom of the pressing plate body 1 close to both sides of the welding wire window 11 , and the protrusions 12 face one side of the bottom.

[0023] In a specific embodiment, the protrusion 12 is arranged on the bottom 1 of the pressure plate and is located on the left and right sides of the welding wire window 11. When pressing, the protrusion 12 contacts and presses the lead frame. Compared with the traditional welding wire pressure plate that uses the edge of the pressing surface of the pressure plate to press the wire, the welding wire is not easily crushed by the pressure plate.

[0024] Furthermore, the main body of the pressing plate 1 further includes reinforcing parts 14 on both sides of the bottom. The reinforcing parts 14 extend downward from the main body of the pressing plate 1 and have a certain distance from one side of the bottom of the welding wire window 11 .

[0025] In a specific embodiment, the reinforcing portion 14 makes the entire pressing plate 1 body present an arch bridge shape, with the bottoms on both sides higher than the bottom in the middle, similar to the shape of a horizontal "[". When the splitting knife does not step into place, it can also prevent part of the product from being crushed by the pressing surface 12 of the pressing plate 1 body and the welding wire from collapsing.

[0026] Of course, the present utility model may have many other implementations. Based on the present implementation, other implementations obtained by ordinary technicians in this field without any creative work are all within the scope of protection of the present utility model.

Claims

1. A wire bonding plate, characterized in that: It includes a pressing plate body, which includes a welding line window arranged on the pressing plate body. The four sides of the welding line window each include a slope surface. The slope surface includes a slope surface that slopes inward and downward from the outside of the pressing plate body and a vertical surface that is connected to the slope surface and is perpendicular to the pressing plate body.

2. The wire bonding plate according to claim 1, characterized in that: The pressing plate body also includes mounting portions arranged on both sides of the pressing plate body, and the mounting portions extend outward from the pressing plate body.

3. The wire bonding plate according to claim 1, characterized in that: The bottom of the pressing plate body close to both sides of the welding wire window is provided with a plurality of protrusions, and the protrusions face one side of the bottom.

4. The wire bonding plate according to claim 3, characterized in that: The pressing plate body also includes reinforcing parts on both sides of the bottom, and the reinforcing parts extend downward from the pressing plate body and have a certain distance from one side of the bottom of the welding wire window.

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