A lead frame

Abstract

The utility model discloses a kind of lead frame, frame body is provided with the longitudinal stamping structure of one-time punch forming, longitudinal stamping structure includes longitudinal unit group, longitudinal alignment structure and transverse alignment structure, wherein, longitudinal unit group includes m units arranged along longitudinal direction, longitudinal alignment structure can facilitate the longitudinal cutting alignment of longitudinal unit group front side and rear side after lead frame injection molding packaging, transverse alignment structure can facilitate the transverse cutting alignment between each unit in longitudinal unit group after lead frame injection molding packaging, whereby the cutting separation of each unit in lead frame can be facilitated, longitudinal unit group, longitudinal alignment structure, transverse alignment structure can be formed on frame body by the same stamping die simultaneously stamping, process is simple and convenient, simultaneously can protect unit, and applicable to the unit design of high density of specification on frame body manufacturing.

Description

Technical Field

[0001] This utility model relates to the field of lead frame technology, and in particular to a lead frame. Background Technology

[0002] Leadframes are structures primarily used to support chips, connect chips to external circuits, and provide heat dissipation and mechanical protection for the chips. Leadframes are typically manufactured using etching processes, but etching is a complex process that requires a large amount of chemicals, resulting in high costs. Therefore, leadframes can also be manufactured using stamping, a simpler method that consumes less material and is less expensive.

[0003] However, existing stamped leadframes typically use die-cutting to separate individual units after injection molding. But die-cutting requires designing support structures on the leadframe, which can affect the unit density, limiting this method to low-density designs. For high-density unit designs, while cutting can separate units, existing stamped leadframes usually involve first stamping individual units according to design requirements, then stamping complex alignment structures. This process is cumbersome. Furthermore, in high-density designs, the close proximity of units and the close proximity of the alignment structures pose a risk of punch damage during the stamping process. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a lead frame that is simple to manufacture and can protect the cell, making it suitable for high-density cell designs.

[0005] According to an embodiment of the present invention, a lead frame includes a frame body, the frame body having at least one set of longitudinal stamping structures, the longitudinal stamping structures being one-time stamping forming structures, wherein the longitudinal stamping structures include: a longitudinal unit group, including m units arranged sequentially at intervals along the longitudinal direction, where m is an integer and m>1; a longitudinal alignment structure, including a first longitudinal alignment group and a second longitudinal alignment group arranged at intervals along the front-rear direction, the first longitudinal alignment group being located on the front side of the longitudinal unit group, the second longitudinal alignment group being located on the rear side of the longitudinal unit group, the first longitudinal alignment group including two first longitudinal alignment holes, the two first longitudinal alignment holes being correspondingly disposed on both sides of the longitudinal unit group along the longitudinal direction, the second longitudinal alignment group including two second longitudinal alignment holes, the two second longitudinal alignment holes being correspondingly disposed on both sides of the longitudinal unit group along the longitudinal direction. The longitudinal unit group has two sides; a transverse alignment structure, including a first transverse alignment group and a second transverse alignment group arranged at intervals along the front-back direction. The first transverse alignment group is located on the front side of the longitudinal unit group and is staggered from the first longitudinal alignment group in the front-back direction and the longitudinal direction. The second transverse alignment group is located on the rear side of the longitudinal unit group and is staggered from the second longitudinal alignment group in the front-back direction and the longitudinal direction. The first transverse alignment group includes m+1 first transverse alignment holes, and the second transverse alignment group includes m+1 second transverse alignment holes. All the first transverse alignment holes and all the second transverse alignment holes correspond one-to-one and are aligned along the front-back direction. In the longitudinal direction, all the units are sequentially located between every two adjacent first transverse alignment holes and sequentially located between every two adjacent second transverse alignment holes.

[0006] The lead frame according to the embodiment of this utility model has at least the following beneficial effects: In the lead frame of this utility model embodiment, the longitudinal stamping structure includes a longitudinal unit group, a longitudinal alignment structure, and a transverse alignment structure. The longitudinal unit group includes m units arranged along the longitudinal direction. The longitudinal alignment structure facilitates the longitudinal cutting alignment of the front and rear sides of the longitudinal unit group after injection molding and encapsulation of the lead frame. The transverse alignment structure facilitates the transverse cutting alignment between the units in the longitudinal unit group after injection molding and encapsulation of the lead frame, that is, the transverse cutting alignment of each unit on both sides in the longitudinal direction. This facilitates the cutting and separation of the units in the lead frame. Furthermore, in... In this embodiment of the utility model, the longitudinal stamping structure adopts a one-time stamping forming structure, which abandons the traditional processing method of stamping the unit first and then stamping the alignment structure. This allows the longitudinal unit group, the longitudinal alignment structure, and the transverse alignment structure to be stamped and formed on the frame body simultaneously using the same stamping die. This not only makes the processing technology of the lead frame simpler and more convenient, but also avoids the situation where the punch is stamped onto the already formed unit during the processing of the alignment structure, thus protecting the unit and making it suitable for manufacturing high-density unit designs on the frame body.

[0007] According to some embodiments of the present invention, the number of longitudinal stamping structures is at least two sets, and all the longitudinal stamping structures are arranged sequentially in the front-back direction. The longitudinal unit groups of each two adjacent sets of longitudinal stamping structures are arranged at intervals in the front-back direction. In each set of longitudinal stamping structures, the distance between the first longitudinal alignment hole and the longitudinal unit group in the front-back direction is less than the distance between two adjacent sets of longitudinal unit groups, and the distance between the second longitudinal alignment hole and the longitudinal unit group in the front-back direction is also less than the distance between two adjacent sets of longitudinal unit groups.

[0008] According to some embodiments of the present invention, the diameter of the second longitudinal alignment hole is greater than or equal to the diameter of the first longitudinal alignment hole; in two adjacent sets of longitudinal stamping structures, the first longitudinal alignment hole of the latter set of the first longitudinal alignment group is located inside the second longitudinal alignment hole of the former set of the second longitudinal alignment group.

[0009] According to some embodiments of the present invention, the diameters of the first longitudinal alignment hole and the second longitudinal alignment hole are both 0.2mm-0.6mm, and the diameter of the first longitudinal alignment hole and the diameter of the second longitudinal alignment hole differ from 0μm to 30μm.

[0010] According to some embodiments of the present invention, each group of longitudinal stamping structures further includes a clearance structure. The clearance structure includes a first clearance group and a second clearance group arranged at intervals along the front-rear direction. The first clearance group is located on the front side of the longitudinal unit group and is arranged at intervals with the first transverse alignment group. The second clearance group is located on the rear side of the longitudinal unit group and is arranged at intervals with the second transverse alignment group. The first clearance group includes m+1 first clearance holes corresponding one-to-one with each of the second transverse alignment holes. The second clearance group includes m+1 second clearance holes corresponding one-to-one with each of the first transverse alignment holes. In two adjacent groups of longitudinal stamping structures, the second transverse alignment holes of the first group of second transverse alignment groups are located within the first clearance holes of the second group of first clearance groups, and the first transverse alignment holes of the second group of first transverse alignment groups are located within the second clearance holes of the first group of second clearance groups.

[0011] According to some embodiments of the present invention, in each group of longitudinal stamping structures, the first transverse alignment group is located in front of the first avoidance group, and the second transverse alignment group is located behind the second avoidance group; in two adjacent groups of longitudinal stamping structures, the first group of second transverse alignment groups is located behind the second group of first transverse alignment groups, and the first group of second avoidance groups is located in front of the second group of first avoidance groups.

[0012] According to some embodiments of the present invention, the spacing between two adjacent sets of longitudinal unit groups is 0.2 mm or 0.3 mm; the spacing between the center of the first transverse alignment hole and the longitudinal unit group is greater than half the spacing between two adjacent sets of longitudinal unit groups.

[0013] According to some embodiments of the present invention, in each group of longitudinal stamping structures, one of each pair of adjacent units is designated as a first unit and the other as a second unit. The first clearance hole located between the first unit and the second unit is partially located at the front top corner of the first unit near the second unit and partially located at the front top corner of the second unit near the first unit. The second clearance hole located between the first unit and the second unit is at least partially located at the rear top corner of the first unit near the second unit and partially located at the rear top corner of the second unit near the first unit.

[0014] According to some embodiments of the present invention, in two adjacent sets of longitudinal stamping structures, the second clearance hole of the second clearance group in the first set overlaps with the first clearance hole of the first clearance group in the second set.

[0015] According to some embodiments of the present invention, each set of longitudinal stamping structures further includes a positioning structure. The positioning structure includes two positioning holes, which are correspondingly disposed at both ends of the longitudinal unit group along the longitudinal direction. In the longitudinal direction, the longitudinal alignment group and the transverse alignment group are both located between the two positioning holes, and the diameters of the first transverse alignment hole, the second transverse alignment hole, the first longitudinal alignment hole, and the second longitudinal alignment hole are all smaller than the diameter of the positioning hole.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 A schematic diagram of a set of longitudinal stamping structures for the lead frame stamping of this utility model embodiment; Figure 2 This is a schematic diagram of the lead frame stamping with two sets of longitudinal stamping structures according to an embodiment of the present utility model; Figure 3 for Figure 2 A partially enlarged schematic diagram of the middle lead frame; Figure 4 for Figure 3 A schematic diagram of the final structure of the middle lead frame; Figure 5 This is a schematic diagram showing multiple sets of longitudinal stamping structures for the lead frame stamping in an embodiment of the present invention.

[0018] Figure label: Frame body 100; Longitudinal stamping structure 200, unit 210, first unit 211, second unit 212, first longitudinal alignment hole 220, second longitudinal alignment hole 230, first transverse alignment hole 240, second transverse alignment hole 250, first clearance hole 260, second clearance hole 270, positioning hole 280. Detailed Implementation

[0019] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0020] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0022] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0023] Reference Figures 1 to 5One embodiment of this utility model provides a lead frame, including a frame body 100. The frame body 100 is provided with at least one set of longitudinal stamping structures 200. The longitudinal stamping structure 200 is a one-time stamping structure. The longitudinal stamping structure 200 includes a longitudinal unit group, a longitudinal alignment structure, and a transverse alignment structure. The longitudinal unit group includes m units 210 arranged sequentially and spaced apart along the longitudinal direction, where m is an integer and m > 1. The longitudinal alignment structure includes a first longitudinal alignment group and a second longitudinal alignment group arranged spaced apart along the front-rear direction. The first longitudinal alignment group is located on the front side of the longitudinal unit group, and the second longitudinal alignment group is located on the rear side of the longitudinal unit group. The first longitudinal alignment group includes two first longitudinal alignment holes 220, which are correspondingly arranged on both sides of the longitudinal unit group along the longitudinal direction. The second longitudinal alignment group includes two second longitudinal alignment holes 230. The longitudinal alignment holes 230 are correspondingly arranged on both sides of the longitudinal unit group along the longitudinal direction; the transverse alignment structure includes a first transverse alignment group and a second transverse alignment group arranged at intervals along the front-back direction. The first transverse alignment group is located on the front side of the longitudinal unit group and is staggered from the first longitudinal alignment group in the front-back direction and the longitudinal direction. The second transverse alignment group is located on the rear side of the longitudinal unit group and is staggered from the second longitudinal alignment group in the front-back direction and the longitudinal direction. The first transverse alignment group includes m+1 first transverse alignment holes 240, and the second transverse alignment group includes m+1 second transverse alignment holes 250. All first transverse alignment holes 240 and all second transverse alignment holes 250 correspond one-to-one and are aligned along the front-back direction. In the longitudinal direction, all units 210 are located between every two adjacent first transverse alignment holes 240 and between every two adjacent second transverse alignment holes 250.

[0024] In the above structure, the longitudinal stamping structure 200 includes a longitudinal unit group, a longitudinal alignment structure, and a transverse alignment structure. The longitudinal unit group includes m units 210 arranged along the longitudinal direction. The longitudinal alignment structure facilitates the longitudinal cutting alignment of the front and rear sides of the longitudinal unit group after the lead frame is injection molded and packaged. The transverse alignment structure facilitates the transverse cutting alignment between the units 210 in the longitudinal unit group after the lead frame is injection molded and packaged, that is, the transverse cutting alignment of each unit 210 on both sides in the longitudinal direction. This facilitates the cutting and separation of the units 210 in the lead frame. Furthermore, in this embodiment of the invention… The longitudinal stamping structure 200 adopts a one-time stamping forming structure, abandoning the traditional processing method of stamping the unit 210 first and then stamping the alignment structure. This allows the longitudinal unit group, longitudinal alignment structure, and transverse alignment structure to be stamped and formed on the frame body 100 simultaneously using the same stamping die. This not only makes the processing technology of the lead frame simpler and more convenient, but also avoids the situation where the punch is stamped onto the already formed unit 210 during the processing of the alignment structure, thus protecting the unit 210. It is also suitable for the design of high-density unit 210 on the frame body 100.

[0025] Specifically, in the longitudinal alignment structure, two first longitudinal alignment holes 220 are located on the front side of the longitudinal unit group and are arranged at intervals along the longitudinal direction, which facilitates the longitudinal cutting and alignment of the front side of the longitudinal unit group after the lead frame is injection molded and packaged. Two second longitudinal alignment holes 230 are located on the rear side of the longitudinal unit group and are arranged at intervals along the longitudinal direction, which facilitates the longitudinal cutting and alignment of the rear side of the longitudinal unit group after the lead frame is injection molded and packaged. In the lateral alignment structure, m+1 first lateral alignment holes 240 and m+1 second lateral alignment holes 250 correspond and align one-to-one in the front-back direction. Thus, each set of first lateral alignment holes 240 and second lateral alignment holes 250 aligned with each other in the front-back direction can be used to align the longitudinal unit group after injection molding and packaging of the lead frame by lateral cutting. In addition, in the longitudinal direction, each unit 210 is located between each two adjacent first lateral alignment holes 240 and between each two adjacent second lateral alignment holes 250. That is, each unit 210 has a set of first lateral alignment holes 240 and second lateral alignment holes 250 aligned in the front-back direction on both sides in the longitudinal direction. This facilitates the lateral cutting and alignment of each unit 210 in the longitudinal unit group after injection molding and packaging of the lead frame.

[0026] Understandably, referring to Figures 1 to 5 The longitudinal unit group includes 9 units 210, i.e., m=9. In this case, in the transverse alignment structure, the first transverse alignment group includes 10 first transverse alignment holes 240, and the second transverse alignment group includes 10 second transverse alignment holes 250. Of course, this only applies to... Figures 1 to 5As an example, in some embodiments, the vertical unit group may include not only 9 units 210, but also 2, 3, 10 or more units 210, as long as m is an integer and m>1. This utility model does not make any specific limitation in this regard.

[0027] Reference Figures 1 to 5 In some embodiments, the number of longitudinal stamping structures 200 is at least two sets, and all longitudinal stamping structures 200 are arranged sequentially in the front-back direction. The longitudinal unit groups of each two adjacent sets of longitudinal stamping structures 200 are arranged at intervals in the front-back direction. In each set of longitudinal stamping structures 200, the distance between the first longitudinal alignment hole 220 and the longitudinal unit group in the front-back direction is smaller than the distance between two adjacent sets of longitudinal unit groups, and the distance between the second longitudinal alignment hole 230 and the longitudinal unit group in the front-back direction is also smaller than the distance between two adjacent sets of longitudinal unit groups.

[0028] In the above structure, since the longitudinal stamping structure 200 is a one-time stamping forming structure, by setting at least two sets of longitudinal stamping structures 200, each set of longitudinal stamping structures 200 can be stamped sequentially on the frame body 100. The process is simple and convenient. Since the longitudinal unit group, longitudinal alignment structure and transverse alignment structure in each set of stamping structure can be stamped and formed on the frame body 100 at the same time, it can also avoid the situation where the punch is stamped on the already formed unit 210 during the processing of the alignment structure, thus protecting the unit 210. It is also suitable for the design of high-density unit 210 on the frame body 100. Furthermore, in two adjacent longitudinal stamping structures 200, the line connecting the centers of the two second longitudinal alignment holes 230 in the first group of second longitudinal alignment groups is located between the two adjacent longitudinal unit groups, and the two first longitudinal alignment holes 220 in the second group of first longitudinal alignment groups are also located between the two adjacent longitudinal unit groups 210. Thus, when the longitudinal alignment structure is longitudinally cut and aligned after the lead frame is injection molded and packaged, the cutter can cut from the connecting rib between the two adjacent longitudinal alignment groups, thereby reducing the risk of the cutter cutting into the unit 210 and causing damage and scrapping of the unit 210.

[0029] Reference Figures 1 to 5In some embodiments, the diameter of the second longitudinal alignment hole 230 is greater than or equal to the diameter of the first longitudinal alignment hole 220; in two adjacent sets of longitudinal stamping structures 200, the first longitudinal alignment hole 220 of the latter set of first longitudinal alignment groups is located within the second longitudinal alignment hole 230 of the former set of second longitudinal alignment groups. This leaves only the second longitudinal alignment hole 230 of the former set of second longitudinal alignment groups between adjacent sets of longitudinal unit groups. If the second longitudinal alignment hole 230 of the former set and the first longitudinal alignment hole 220 of the latter set are spaced apart between adjacent sets of longitudinal unit groups, it will not only occupy the area of ​​the frame body 100, but also create two sets of longitudinal alignment structures between adjacent sets of longitudinal unit groups, thus affecting the longitudinal cutting alignment between adjacent sets of longitudinal unit groups. By adopting the lead frame of this embodiment, only the second longitudinal alignment hole 230 of the former set of second longitudinal alignment groups is left between adjacent sets of longitudinal unit groups, such as... Figure 4 and Figure 5 As shown, this avoids affecting the design density of the unit 210 on the frame body 100 and the longitudinal cutting alignment after injection molding of the lead frame due to the simultaneous presence of the first longitudinal alignment hole 220 and the second longitudinal alignment hole 230 between two adjacent longitudinal unit groups. In addition, when processing the next set of longitudinal stamping structures 200, the first longitudinal alignment hole 220 of the next set will fall into the second longitudinal alignment hole 230 of the previous set. Since the diameter of the second longitudinal alignment hole 230 is greater than or equal to the diameter of the first longitudinal alignment hole 220, the punch of the next set of second longitudinal alignment holes 230 can be avoided, so that the punch of the next set of second longitudinal alignment holes 230 can smoothly enter and exit the second longitudinal alignment hole 230 of the previous set.

[0030] In some embodiments, the diameters of the first longitudinal alignment hole 220 and the second longitudinal alignment hole 230 are both 0.2mm-0.6mm, and the diameter difference between the first longitudinal alignment hole 220 and the second longitudinal alignment hole 230 is 0μm to 30μm. Therefore, when processing a subsequent set of longitudinal stamping structures 200, the first longitudinal alignment hole 220 of the subsequent set will fall within the second longitudinal alignment hole 230 of the preceding set. Since the diameter of the second longitudinal alignment hole 230 is greater than or equal to the diameter of the first longitudinal alignment hole 220, the punch used to process the subsequent set of second longitudinal alignment holes 230 can be avoided, allowing the punch of the processed second longitudinal alignment hole 230 to smoothly enter and exit the preceding set of second longitudinal alignment holes 230.

[0031] Reference Figures 1 to 5In some embodiments, each set of longitudinal stamping structures 200 further includes a clearance structure, which includes a first clearance group and a second clearance group arranged at intervals along the front-rear direction. The first clearance group is located on the front side of the longitudinal unit group and is arranged at intervals with the first transverse alignment group. The second clearance group is located on the rear side of the longitudinal unit group and is arranged at intervals with the second transverse alignment group. The first clearance group includes m+1 first clearance holes 260 corresponding one-to-one with each of the second transverse alignment holes 250. The second clearance group includes m+1 second clearance holes 270 corresponding one-to-one with each of the first transverse alignment holes 240. In two adjacent sets of longitudinal stamping structures 200, the second transverse alignment holes 250 of the first set of second transverse alignment groups are located within the first clearance holes 260 of the second set of first clearance groups, and the first transverse alignment holes 240 of the second set of first transverse alignment groups are located within the second clearance holes 270 of the first set of second clearance groups.

[0032] Therefore, in two adjacent sets of longitudinal stamping structures 200, when the latter set of longitudinal stamping structures 200 is processed, the first transverse alignment component of the latter set can fall into the second clearance hole 270 of the former set. During processing, the first clearance hole 260 of the latter set can punch away the second transverse alignment hole 250 of the former set, thus leaving only the second clearance hole 270 of the former set and the first clearance hole 260 of the latter set between the two sets of longitudinal stamping structures 200. Thus, as... Figure 4 and Figure 5 As shown, after stamping each set of longitudinal stamping structures 200 sequentially from front to back, m+1 first transverse alignment holes 240 can be retained on the front side of the first set of longitudinal unit groups, and m+1 second transverse alignment holes 250 can be retained on the rear side of the last set of longitudinal unit groups. The m+1 first transverse alignment holes 240 on the front side of the first set of longitudinal unit groups correspond one-to-one with the m+1 second transverse alignment holes 250 on the rear side of the last set of longitudinal unit groups and are aligned. This facilitates the transverse cutting and alignment of each unit 210. The second clearance hole 270 of the previous set and the first clearance hole 260 of the next set can be retained between two adjacent sets of longitudinal unit groups, which facilitates the cutting and separation between two adjacent units 210 in the longitudinal direction.

[0033] Reference Figures 1 to 5In some embodiments, in each set of longitudinal stamping structures 200, the first transverse alignment group is located in front of the first clearance group, and the second transverse alignment group is located in front of the second clearance group; in two adjacent sets of longitudinal stamping structures 200, the first set of second transverse alignment groups is located in front of the second set of first transverse alignment groups, and the first set of second clearance groups is located in front of the second set of first clearance groups. This makes it convenient for the second transverse alignment hole 250 of the first set of second transverse alignment groups to fall into the first clearance hole 260 of the second set of first clearance groups when the two adjacent sets of longitudinal stamping structures 200 are stamped in sequence. The first transverse alignment hole 240 of the second set of first transverse alignment groups falls into the second clearance hole 270 of the first set of second clearance groups.

[0034] Reference Figures 1 to 5 In some embodiments, the spacing between two adjacent longitudinal unit groups is 0.2 mm or 0.3 mm, and the spacing between the center of the first transverse alignment hole 240 and the longitudinal unit group is greater than half the spacing between two adjacent longitudinal unit groups. This facilitates the design of the avoidance structure, so that in two adjacent longitudinal stamping structures 200, the second transverse alignment hole 250 of the first second transverse alignment group can be located within the first avoidance hole 260 of the second first avoidance group, and the first transverse alignment hole 240 of the second first transverse alignment group can be located within the second avoidance hole 270 of the first second avoidance group. At the same time, it avoids the situation where the spacing between the first transverse alignment group and the second transverse alignment group between two adjacent longitudinal unit groups is too small and misalignment occurs.

[0035] Reference Figures 1 to 5 In some embodiments, in each group of longitudinal stamping structures 200, one of every two adjacent units 210 is designated as a first unit 211 and the other as a second unit 212. A first clearance hole 260 located between the first unit 211 and the second unit 212 is partially located at the front apex corner of the first unit 211 near the second unit 212 and partially located at the front apex corner of the second unit 212 near the first unit 211. A second clearance hole 270 located between the first unit 211 and the second unit 212 is at least partially located at the rear apex corner of the first unit 211 near the second unit 212 and partially located at the rear apex corner of the second unit 212 near the first unit 211. This design ensures that each apex corner of each unit 210 has a clearance structure, providing space for the design of the first lateral alignment hole 240 and the second lateral alignment hole 250, and preventing damage to the units 210 of the previous group of longitudinal stamping structures 200 during the stamping of the subsequent longitudinal stamping structure 200.

[0036] Reference Figures 1 to 5In two adjacent sets of longitudinal stamping structures 200, the second clearance hole 270 of the first clearance group of the first clearance group of the second clearance group of the first clearance group of the second clearance group of the second clearance group of the second clearance group of the first ... first clearance group of the second clearance group of the second clearance group of the second clearance group of the second clearance group of the second clearance group of the second clearance group of the second clearance group of the second clearance group of the second

[0037] Reference Figures 1 to 5 In some embodiments, each set of longitudinal stamping structures 200 further includes a positioning structure. The positioning structure includes two positioning holes 280, which are correspondingly disposed at both ends of the longitudinal unit group along the longitudinal direction. In the longitudinal direction, both the longitudinal alignment group and the transverse alignment group are located between the two positioning holes 280, and the diameters of the first transverse alignment hole 240, the second transverse alignment hole 250, the first longitudinal alignment hole 220, and the second longitudinal alignment hole 230 are all smaller than the diameter of the positioning holes 280. When the lead frame is ready to be cut and separated after injection molding and encapsulation, the positioning holes 280 can be used to position and fix the lead frame, preventing the lead frame from moving during the cutting and separation process.

[0038] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A lead frame, characterized in that, The system includes a frame body (100), which has at least one set of longitudinal stamping structures (200). The longitudinal stamping structures (200) are formed by a single stamping process. The longitudinal stamping structures (200) include: The longitudinal unit group comprises m units (210) arranged sequentially at intervals along the longitudinal direction, where m is an integer and m>1; The longitudinal alignment structure includes a first longitudinal alignment group and a second longitudinal alignment group arranged at intervals along the front-back direction. The first longitudinal alignment group is located on the front side of the longitudinal unit group, and the second longitudinal alignment group is located on the rear side of the longitudinal unit group. The first longitudinal alignment group includes two first longitudinal alignment holes (220), which are correspondingly arranged on both sides of the longitudinal unit group along the longitudinal direction. The second longitudinal alignment group includes two second longitudinal alignment holes (230), which are correspondingly arranged on both sides of the longitudinal unit group along the longitudinal direction. The transverse alignment structure includes a first transverse alignment group and a second transverse alignment group arranged at intervals along the front-back direction. The first transverse alignment group is located in front of the longitudinal unit group and is staggered from the first longitudinal alignment group in the front-back direction and the longitudinal direction. The second transverse alignment group is located behind the longitudinal unit group and is staggered from the second longitudinal alignment group in the front-back direction and the longitudinal direction. The first transverse alignment group includes m+1 first transverse alignment holes (240), and the second transverse alignment group includes m+1 second transverse alignment holes (250). All the first transverse alignment holes (240) and all the second transverse alignment holes (250) correspond to and are aligned one-to-one in the front-back direction. In the longitudinal direction, all the units (210) are located between every two adjacent first transverse alignment holes (240) and between every two adjacent second transverse alignment holes (250).

2. The lead frame according to claim 1, characterized in that, The number of the longitudinal stamping structures (200) is at least two sets, and all the longitudinal stamping structures (200) are arranged sequentially in the front-back direction. The longitudinal unit groups of each two adjacent sets of the longitudinal stamping structures (200) are arranged at intervals in the front-back direction. In each set of longitudinal stamping structures (200), the distance between the first longitudinal alignment hole (220) and the longitudinal unit group in the front-back direction is smaller than the distance between two adjacent sets of longitudinal unit groups, and the distance between the second longitudinal alignment hole (230) and the longitudinal unit group in the front-back direction is also smaller than the distance between two adjacent sets of longitudinal unit groups.

3. The lead frame according to claim 2, characterized in that, The diameter of the second longitudinal alignment hole (230) is greater than or equal to the diameter of the first longitudinal alignment hole (220); In two adjacent sets of longitudinal stamping structures (200), the first longitudinal alignment hole (220) of the latter set of the first longitudinal alignment group is located within the second longitudinal alignment hole (230) of the former set of the second longitudinal alignment group.

4. The lead frame according to claim 3, characterized in that, The diameters of the first longitudinal alignment hole (220) and the second longitudinal alignment hole (230) are both 0.2mm-0.6mm, and the diameter of the first longitudinal alignment hole (220) and the diameter of the second longitudinal alignment hole (230) differ by 0μm to 30μm.

5. The lead frame according to claim 2, characterized in that, Each set of longitudinal stamping structures (200) further includes a clearance structure, which includes a first clearance group and a second clearance group arranged at intervals along the front-rear direction. The first clearance group is located on the front side of the longitudinal unit group and is arranged at intervals with the first transverse alignment group. The second clearance group is located on the rear side of the longitudinal unit group and is arranged at intervals with the second transverse alignment group. The first clearance group includes m+1 first clearance holes (260) that correspond one-to-one with each of the second transverse alignment holes (250). The second clearance group includes m+1 second clearance holes (270) that correspond one-to-one with each of the first transverse alignment holes (240). In two adjacent sets of longitudinal stamping structures (200), the second transverse alignment hole (250) of the first set of the second transverse alignment group is located in the first clearance hole (260) of the second set of the first clearance group, and the first transverse alignment hole (240) of the second set of the first transverse alignment group is located in the second clearance hole (270) of the first set of the second clearance group.

6. The lead frame according to claim 5, characterized in that, In each set of longitudinal stamping structures (200), the first transverse alignment group is located in front of the first clearance group, and the second transverse alignment group is located behind the second clearance group; In two adjacent sets of longitudinal stamping structures (200), the first set of second transverse alignment groups is located behind the second set of first transverse alignment groups, and the first set of second clearance groups is located in front of the second set of first clearance groups.

7. The lead frame according to claim 6, characterized in that, The spacing between two adjacent longitudinal unit groups is 0.2 mm or 0.3 mm; The distance between the center of the first transverse alignment hole (240) and the longitudinal unit group is greater than half the distance between two adjacent longitudinal unit groups.

8. The lead frame according to claim 5, characterized in that, In each set of the longitudinal stamping structures (200), one of each pair of adjacent units (210) is designated as a first unit (211) and the other as a second unit (212). The first clearance hole (260) located between the first unit (211) and the second unit (212) is partially located at the front top corner of the first unit (211) near the second unit (212) and partially located at the front top corner of the second unit (212) near the first unit (211). The second clearance hole (270) located between the first unit (211) and the second unit (212) is at least partially located at the rear top corner of the first unit (211) near the second unit (212) and partially located at the rear top corner of the second unit (212) near the first unit (211).

9. The lead frame according to claim 8, characterized in that, In two adjacent sets of longitudinal stamping structures (200), the second clearance hole (270) of the first set of the second clearance group partially overlaps with the first clearance hole (260) of the second set of the first clearance group.

10. The lead frame according to claim 1, characterized in that, Each set of longitudinal stamping structures (200) also includes a positioning structure, which includes two positioning holes (280). The two positioning holes (280) are correspondingly disposed at both ends of the longitudinal unit group along the longitudinal direction. In the longitudinal direction, the longitudinal alignment group and the transverse alignment group are both located between the two positioning holes (280), and the diameters of the first transverse alignment hole (240), the second transverse alignment hole (250), the first longitudinal alignment hole (220), and the second longitudinal alignment hole (230) are all smaller than the diameter of the positioning hole (280).

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