Structure for preventing silver surface of SOT packaging lead frame from being abraded

Abstract

The utility model discloses a structure for preventing a silver surface of an SOT packaging lead frame from being abraded, and relates to the technical field of lead frames. The device comprises a frame plate, the end faces of the frame plates are provided with a plurality of silver plating layers arranged in a square array, the front end face of each frame plate is provided with a plurality of first protruding strips arranged in a left-right linear mode, and second protruding strips are arranged at the positions, corresponding to the first protruding strips, of the rear end face of each frame plate. According to the utility model, the raised line I and the raised line II are assembled on the frame plate, so that a gap is formed between the silver plating layer and the frame plate, mutual friction between the silver plating layer and the frame plate is avoided, and the silver plating layer can be prevented from being abraded.

Description

Technical Field

[0001] This utility model belongs to the field of lead frame technology, and in particular relates to a structure for preventing silver surface scratches on an SOT packaged lead frame. Background Technology

[0002] SOT (Surface Mount Technology) package is a rectangular or square plastic package with pins extending from one or two sides. Depending on the application and functional requirements, SOT packages come in different sizes and pin counts, and corresponding lead frames are used in SOT packages.

[0003] During the stacking process after the leadframe is cut in post-processing, friction easily occurs between the leadframe wafers. Furthermore, the silver plating on the leadframe is relatively soft, and friction with the copper surface on the back of the previous leadframe wafer can cause scratches on the silver surface. Since the silver-plated surface is the functional surface, this can lead to the loss of function of the leadframe, rendering it unusable. To address this issue, we provide a structure for SOT-packaged leadframes to prevent silver surface scratches, thus solving the aforementioned problems. Utility Model Content

[0004] The purpose of this utility model is to provide a structure for preventing the silver surface of an SOT packaged lead frame from being scratched. By assembling the first and second protrusions onto the frame plate, a gap is created between the silver plating layer and the frame plate, thereby avoiding mutual friction between the silver plating layer and the frame plate and preventing the silver plating layer from being scratched.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0006] This utility model is a structure for preventing silver surface scratches on SOT packaged lead frame, including a frame plate; the end face of the frame plate has multiple silver-plated layers arranged in a square array, the front face of each frame plate has multiple protrusions arranged linearly from left to right, and the rear face of the frame plate has protrusions at the positions corresponding to the protrusions.

[0007] The present invention is further configured such that both the first and second protrusions are U-shaped, both protrusions are sleeved on the frame plate, and their two end faces abut against each other, with each protrusion located between two adjacent silver plating layers.

[0008] The present invention is further configured such that assembly balls are fixed on the inner sidewalls of both end faces of protrusion one and protrusion two, and assembly holes are opened at the positions corresponding to the assembly balls on the end faces of the frame plate, with the assembly balls respectively located inside the corresponding assembly holes.

[0009] The present invention is further configured such that a pad is fixed on the opposing surfaces of the inner sides of the first and second protrusions, and the pad abuts against the end face of the adjacent frame plate.

[0010] The present invention is further configured such that two positioning holes are provided on the vertical surface of the first protrusion opposite to the frame plate, and positioning balls are fixed on the second protrusion opposite to the vertical surface of the frame plate at the positions corresponding to the positioning holes.

[0011] This utility model has the following beneficial effects:

[0012] This invention involves fitting protruding strip one and protruding strip two onto the frame plate, thereby assembling protruding strip one, protruding strip two, and the frame plate together. As a result, the end faces of protruding strip one and protruding strip two will extend beyond the silver plating layer. Therefore, when the two frame plates are stacked, there is a gap between the silver plating layer and the frame plate, which avoids mutual friction between the silver plating layer and the frame plate and prevents the silver plating layer from being scratched.

[0013] Of course, any product implementing this utility model does not necessarily need to achieve all of the above advantages at the same time. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0016] Figure 2 This is a structural assembly diagram of the frame plate in this utility model.

[0017] Figure 3 This is a combined diagram of the frame plate, protrusion one, and protrusion two in this utility model.

[0018] Figure 4 This is a combined diagram of protruding strip one and protruding strip two in this utility model.

[0019] The attached diagram lists the components represented by each number as follows:

[0020] 1-Frame plate, 101-Silver plating layer, 102-Assembly hole, 2-Protrusion strip one, 201-Positioning port, 3-Protrusion strip two, 301-Positioning ball, 4-Padded plate, 5-Assembly ball. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0022] Example 1

[0023] Please see Figures 1 to 4 This utility model is a structure for preventing the silver surface of an SOT packaged lead frame from being scratched. By assembling the first 2 and the second 3 on the frame plate 1, a gap is created between the silver plating layer 101 and the frame plate 1, thereby avoiding mutual friction between the silver plating layer 101 and the frame plate 1 and preventing the silver plating layer 101 from being scratched.

[0024] Specifically, the frame plate 1 has multiple silver-plated layers 101 arranged in a square array on its end face. Each front face of the frame plate 1 has multiple raised strips 2 arranged in a left-right linear pattern. The rear face of the frame plate 1 has raised strips 3 at the positions corresponding to the raised strips 2.

[0025] The operation process of this embodiment is as follows: by setting and using the above structure, protrusion 2 and protrusion 3 are respectively fitted onto the frame plate 1, so that protrusion 2, protrusion 3 and frame plate 1 are assembled together. Then, the end faces of protrusion 2 and protrusion 3 will exceed the silver plating layer 101. Therefore, after the two frame plates 1 are stacked, there is a gap between the silver plating layer 101 and the frame plate 1, so as to avoid mutual friction between the silver plating layer 101 and the frame plate 1, and thus avoid the silver plating layer 101 from being worn.

[0026] Example 2

[0027] Please see Figure 2 and Figure 4 Based on Example 1, by installing the assembly ball 5 in the assembly hole 102, the first protrusion 2 and the second protrusion 3 can be stably assembled on the frame plate 1.

[0028] Specifically, both the first protrusion 2 and the second protrusion 3 are U-shaped. Both the first protrusion 2 and the second protrusion 3 are fitted onto the frame plate 1, and their two end faces abut against each other. Each first protrusion 2 is located between two adjacent silver plating layers 101. The inner sidewalls of the two end faces of the first protrusion 2 and the second protrusion 3 are fixed with assembly balls 5. The end face of the frame plate 1 is provided with assembly holes 102 at the positions corresponding to the assembly balls 5, and the assembly balls 5 are located inside the corresponding assembly holes 102.

[0029] The operation process of this embodiment is as follows: When installing the first protrusion 2 and the second protrusion 3, the first protrusion 2 and the second protrusion 3 are fitted onto the frame plate 1, so that the assembly ball 5 on the end face of the first protrusion 2 and the second protrusion 3 is in the assembly hole 102. Thus, the assembly hole 102 limits the assembly ball 5, which can prevent the first protrusion 2 and the second protrusion 3 from detaching from the frame plate 1.

[0030] Example 3

[0031] Please see Figure 1 and Figure 4 Based on Example 1, the positioning ball 301 is positioned in the positioning port 201, which ensures the stability of the stacking of pad 4 and pad 4.

[0032] Specifically, pads 4 are fixed on the inner opposite surfaces of protrusion 2 and protrusion 3, and the pads 4 abut against the end face of the adjacent frame plate 1. Protrusion 2 has two positioning holes 201 arranged symmetrically on its vertical surface opposite to the frame plate 1. Protrusion 3 has positioning balls 301 fixed at the positions corresponding to the positioning holes 201 on its vertical surface opposite to the frame plate 1.

[0033] The operation process of this embodiment is as follows: When the first protrusion 2 and the second protrusion 3 are assembled on the frame plate 1, the pads 4 on the inner side of the first protrusion 2 and the second protrusion 3 will avoid contact with the frame plate 1, thereby reducing the friction between the first protrusion 2, the second protrusion 3 and the frame plate 1. At the same time, after multiple pads 4 are stacked, the positioning ball 301 on the end face of the second protrusion 3 will be in the positioning port 201 on the end face of the first protrusion 2, thereby ensuring the stability of the pads 4 stacked together.

[0034] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0035] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A structure for preventing silver surface scratches on an SOT packaged lead frame, comprising a frame plate (1); characterized in that: The end face of the frame plate (1) has a plurality of silver-plated layers (101) arranged in a square array. The front face of each frame plate (1) is provided with a plurality of protrusions (2) arranged in a left-right linear manner. The rear face of the frame plate (1) is provided with protrusions (3) at the positions corresponding to the protrusions (2).

2. The structure for preventing silver surface scratches on an SOT packaged lead frame according to claim 1, characterized in that, Both the first protrusion (2) and the second protrusion (3) are U-shaped. Both the first protrusion (2) and the second protrusion (3) are fitted onto the frame plate (1), and their two end faces abut against each other. Each first protrusion (2) is located between two adjacent silver plating layers (101).

3. The structure for preventing silver surface scratches on an SOT packaged lead frame according to claim 2, characterized in that, The inner sidewalls of both ends of the first protrusion (2) and the second protrusion (3) are fixed with assembly balls (5). The end face of the frame plate (1) is provided with assembly holes (102) at the positions corresponding to the assembly balls (5). The assembly balls (5) are respectively located inside the corresponding assembly holes (102).

4. The structure for preventing silver surface scratches on an SOT packaged lead frame according to claim 1, characterized in that, The inner sides of the protrusions 1 (2) and 2 (3) are fixed with pads (4), and the pads (4) abut against the end face of the adjacent frame plate (1).

5. The structure for preventing silver surface scratches on an SOT packaged lead frame according to claim 1, characterized in that, The first protrusion (2) has two symmetrically arranged positioning holes (201) on its vertical surface opposite to the frame plate (1), and the second protrusion (3) has a positioning ball (301) fixed at the position corresponding to the positioning hole (201) on its vertical surface opposite to the frame plate (1).

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