Package for electronic component
By designing a specifically shaped joint in the package for electronic components and using a joint structure formed by laser welding, the problem of heat concentration during welding is solved, heat transfer suppression and peeling control are achieved, and the heat resistance and stability of the package are enhanced.
Patent Information
- Application Number
- CN202422569568.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Priority Date
- 2023-11-24
- Filing Date
- 2024-10-23
- Publication Date
- 2025-09-09
- Estimated Expiration
- 2034-10-23
AI Technical Summary
When conventional electronic component packages are welded with metal foil, heat tends to concentrate at the corners of the quadrilateral, causing heat transfer to negatively impact the electronic components.
A package for electronic components is designed in which the inner periphery of the connecting portion of the joint is located on the opposite side of the center of the metal foil relative to the virtual straight line, and the width of the connecting portion is smaller than that of the other parts. The joint is formed by laser welding, and the laser trajectory is controlled to deviate from the corners of the metal foil to form a joint structure of a specific shape.
It effectively inhibits the transfer of heat from the joint to the electronic components in the enclosed space, reduces the impact of thermal stress on the electronic components, and limits the peeling extension when the metal foil is peeled off, maintaining the bonding strength.
Smart Images
Figure CN223321259U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to packaging for electronic components. Background Art
[0002] The package for electronic components disclosed in Patent Document 1 includes a first metal foil and a second metal foil. The shape of the first metal foil is a quadrilateral when viewed from above. The shape and size of the second metal foil are substantially the same as those of the first metal foil. The first metal foil and the second metal foil are overlapped so that their outer edges are aligned with each other. In addition, the package for electronic components includes a joint formed by welding the outer edge of the first metal foil and the outer edge of the second metal foil. The joint is a square ring extending along the edge of each metal foil. A closed space is separated by the first metal foil and the second metal foil. Electronic components are stored in the closed space.
[0003] Patent Document 1: Japanese Patent No. 5377763
[0004] In the electronic component package described in Patent Document 1, the outer edges of the first and second metal foils are sometimes welded together while the electronic component is positioned between them. In this case, heat from welding the two metal foils can be transferred to the electronic component, negatively impacting it. In particular, heat from welding tends to concentrate at the corners of the rectangular metal foils. Therefore, there is a need for an electronic component package structure that minimizes heat transfer to the electronic component during welding. Utility Model Content
[0005] In order to solve the above-mentioned problems, the present invention is a package for electronic components, which comprises: a first metal foil; a second metal foil overlapping with the above-mentioned first metal foil; and a joint portion, which is a portion formed by joining the outer edge portion of the above-mentioned first metal foil and the outer edge portion of the above-mentioned second metal foil. When the edge of the edge of the above-mentioned joint portion located on the center side of the main surface of the above-mentioned first metal foil is taken as the inner peripheral edge, the above-mentioned joint portion comprises: a first portion, the above-mentioned inner peripheral edge is a straight line; a second portion, the above-mentioned inner peripheral edge is a straight line and extends in a direction different from the above-mentioned first portion; and a connecting portion connecting the end portion of the above-mentioned first portion and the end portion of the above-mentioned second portion. When a first virtual straight line including the above-mentioned inner peripheral edge of the above-mentioned first portion and a second virtual straight line including the above-mentioned inner peripheral edge of the above-mentioned second portion are assumed, the above-mentioned inner peripheral edge of the above-mentioned connecting portion is located on the opposite side of the center of the above-mentioned main surface relative to the above-mentioned first virtual straight line or on the opposite side of the center of the above-mentioned main surface relative to the above-mentioned second virtual straight line.
[0006] Alternatively, when the edge of the edge of the joint portion that is located on the opposite side of the center of the main surface relative to the inner periphery is taken as the outer periphery, and the point on the inner periphery of the connecting portion that is closest to the outer periphery is taken as a specific point, the specific point is located on the outer periphery side of the first part relative to the first virtual straight line, and is located on the outer periphery side of the second part relative to the second virtual straight line.
[0007] It can also be that when the edge of the edge of the above-mentioned joint portion that is located on the opposite side of the center of the above-mentioned main surface relative to the above-mentioned inner periphery is taken as the outer periphery, and the shortest distance from any point on the above-mentioned outer periphery to the above-mentioned inner periphery of the above-mentioned joint portion is taken as the width dimension of the above-mentioned joint portion, the smallest width dimension in the above-mentioned connecting portion is smaller than the smallest width dimension in the above-mentioned first portion and the smallest width dimension in the above-mentioned second portion.
[0008] The smallest width dimension of the connecting portion may be not less than 1 / 2 and not more than 4 / 5 of the smallest width dimension of the first portion.
[0009] In addition, the utility model is a method for manufacturing a package for an electronic component, which comprises: a preparation step, in which a first metal foil and a second metal foil overlapping with the first metal foil are prepared; and a joining step, in which an outer edge portion of the first metal foil and an outer edge portion of the second metal foil are joined by a laser to form a joining portion, an edge of the edge of the joining portion located on the center side of the main surface of the first metal foil is used as an inner peripheral edge, a portion of the joining portion in which the inner peripheral edge is linear is used as a first portion, and the inner peripheral edge is linear and is not aligned with the first portion. The part extending in the same direction is regarded as the second part, and the part connecting the end of the above-mentioned first part and the end of the above-mentioned second part is regarded as the connecting part. When it is assumed that there are a first virtual straight line including the above-mentioned inner periphery of the above-mentioned first part and a second virtual straight line including the above-mentioned inner periphery of the above-mentioned second part, in the above-mentioned joining process, the above-mentioned outer edge part of the above-mentioned first metal foil and the above-mentioned outer edge part of the above-mentioned second metal foil are joined so that the above-mentioned inner periphery of the above-mentioned connecting part is located on the opposite side of the center of the above-mentioned main surface relative to the above-mentioned first virtual straight line or on the opposite side of the center of the above-mentioned main surface relative to the above-mentioned second virtual straight line.
[0010] Heat generated when the metal foils are bonded together is less likely to be transferred to the electronic components. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 This is a perspective view of a package for electronic components.
[0012] Figure 2 This is an enlarged view of a portion of a package for electronic components.
[0013] Figure 3 This is a flow chart of a method for manufacturing a package for an electronic component.
[0014] Figure 4 This is a diagram illustrating a method for manufacturing a package for an electronic component.
[0015] Description of Reference Numerals
[0016] 10…Electronic component package; 11…First metal foil; MF…Main surface; 13…Joint portion; 14…Inner periphery; 15…Outer periphery; P1…First portion; P2…Second portion; P3…Connecting portion; W…Width dimension; Wmin…Width dimension; L1…First virtual straight line; L2…Second virtual straight line; SP…Specific point. DETAILED DESCRIPTION
[0017] <One embodiment of a package for an electronic component and a method for manufacturing the same>
[0018] The following describes one embodiment of a package for an electronic component and a method for manufacturing the same. The accompanying drawings are schematic diagrams for ease of understanding, and some components may be exaggerated or omitted. Therefore, the dimensional ratios of the components may differ from the actual dimensions.
[0019] (About the overall structure)
[0020] like Figure 1 As shown, the electronic component package 10 includes a first metal foil 11 and a second metal foil 12 .
[0021] The first metal foil 11 is a substantially square foil. The material of the first metal foil 11 is stainless steel. The first metal foil 11 has a main surface MF. The main surface MF is one of the largest surfaces of the first metal foil 11.
[0022] The first metal foil 11 has a first bonding portion 11A and a first non-bonding portion 11B. The first bonding portion 11A is a portion of the first metal foil 11 that is bonded to the second metal foil 12. The first bonding portion 11A extends over the entire outer edge of the first metal foil 11. That is, the first bonding portion 11A is a roughly quadrilateral ring. Hereinafter, the edge of the first bonding portion 11A located on the center side of the main surface MF of the first metal foil 11 is referred to as the inner peripheral edge 14. The edge of the first bonding portion 11A located on the opposite side of the center of the main surface MF relative to the inner peripheral edge 14 when viewed in a direction perpendicular to the main surface MF is referred to as the outer peripheral edge 15. The shape of the inner peripheral edge 14 is generally roughly quadrilateral. The outer peripheral edge 15 is aligned with the outer edge of the first metal foil 11. Therefore, the shape of the outer peripheral edge 15 is quadrilateral.
[0023] The first non-joined portion 11B is a portion of the first metal foil 11 that is not joined to the second metal foil 12. In other words, the first non-joined portion 11B is the portion of the first metal foil 11 surrounded by the inner periphery 14 of the first joining portion 11A. Therefore, the first non-joined portion 11B has a substantially square planar shape. Furthermore, the first non-joined portion 11B is separable from the second metal foil 12. The center of the first non-joined portion 11B is aligned with the center of the main surface MF of the first metal foil 11.
[0024] like Figure 1 As shown, the second metal foil 12 is a foil that is roughly quadrilateral. The material of the second metal foil 12 is stainless steel. The second metal foil 12 has a second bonding portion 12A and a second non-bonding portion 12B. The second bonding portion 12A is the portion of the second metal foil 12 that is bonded to the first metal foil 11. The second bonding portion 12A extends over roughly the entire outer edge of the second metal foil 12. That is, the second bonding portion 12A is roughly quadrilateral and annular. The shape of the second bonding portion 12A is consistent with that of the first bonding portion 11A. Therefore, the shape of the inner periphery 14 of the second bonding portion 12A is roughly quadrilateral. In addition, the shape of the outer periphery 15 of the second bonding portion 12A is quadrilateral.
[0025] Furthermore, the second non-joined portion 12B is a portion of the second metal foil 12 that is not joined to the first metal foil 11. In other words, the second non-joined portion 12B is a portion of the second metal foil 12 surrounded by the inner periphery 14 of the second joining portion 12A. Furthermore, the second non-joined portion 12B is separable from the first metal foil 11. The shape of the second non-joined portion 12B is the same as that of the first non-joined portion 11B.
[0026] According to the above structure, the electronic component package 10 has a closed space partitioned by the first metal foil 11 and the second metal foil 12. Figure 1 Although not shown in the figure, the electronic component package 10 stores a predetermined electronic component EC in the closed space.
[0027] Furthermore, the first metal foil 11 and the second metal foil 12 are welded together in the joining step S11 described below. Therefore, the first joining portion 11A is the portion formed by the melting of the first metal foil 11. The second joining portion 12A is the portion formed by the melting of the second metal foil 12. Furthermore, the first joining portion 11A and the second joining portion 12A are joined together as a single unit. Therefore, sometimes a clear boundary between the first joining portion 11A and the second joining portion 12A is not observable.
[0028] Hereinafter, the integrated body of the first joining portion 11A and the second joining portion 12A will be referred to as the joining portion 13. Furthermore, the inner periphery 14 of the first joining portion 11A and the second joining portion 12A will be described as the inner periphery 14 of the joining portion 13. Similarly, the outer periphery 15 of the first joining portion 11A and the second joining portion 12A will be described as the outer periphery 15 of the joining portion 13. Therefore, the joining portion 13 is formed by joining the outer periphery of the first metal foil 11 and the outer periphery of the second metal foil 12. The material of the joining portion 13 is the same as that of the first metal foil 11 and the second metal foil 12.
[0029] (Regarding the shape of the joint)
[0030] As described above, the first joining portion 11A and the second joining portion 12A are joined to each other to form the joining portion 13 . Therefore, the shapes of the first joining portion 11A and the second joining portion 12A will be described below as the shape of the joining portion 13 .
[0031] like Figure 1 As shown, the joint 13 includes a pair of first portions P1, a pair of second portions P2, and four connecting portions P3. The first portion P1 is a portion extending along any side of the first metal foil 11 when viewed from above. In the first portion P1, the inner periphery 14 and the outer periphery 15 extend substantially parallel to each other. Therefore, the first portion P1 is an elongated rectangle when viewed from above. Here, as shown in FIG. Figure 2 As shown, the shortest distance from any point on the outer periphery 15 to the inner periphery 14 is defined as the width W of the joint 13. As described above, the inner periphery 14 and the outer periphery 15 of the first portion P1 are parallel, so the width W of the first portion P1 is substantially the same throughout the entire portion P1.
[0032] like Figure 1 As shown, the pair of first portions P1 extend along two sides of the first metal foil 11 that extend substantially parallel to each other when viewed from above. Therefore, the pair of first portions P1 extend substantially parallel to each other. However, each first portion P1 does not reach the four corners of the first metal foil 11.
[0033] The second portion P2 extends along the side of the first metal foil 11 where the first portion P1 is not provided, when viewed from above. In the second portion P2, the inner periphery 14 and outer periphery 15 extend approximately parallel to each other. Therefore, the second portion P2 is an elongated rectangular shape when viewed from above. As described above, the inner periphery 14 and outer periphery 15 of the second portion P2 are parallel, so the width W of the second portion P2 is approximately constant throughout the entire portion P2. Furthermore, the width W of the second portion P2 is approximately equal to the width W of the first portion P1.
[0034] The pair of second portions P2 extend substantially parallel to each other when viewed from above, along two sides of the first metal foil 11 where the first portion P1 is not provided. Therefore, the pair of second portions P2 extend substantially parallel to each other. However, each second portion P2 does not reach the four corners of the first metal foil 11.
[0035] The inner periphery 14 and outer periphery 15 of the first portion P1 extend in different directions from the inner periphery 14 and outer periphery 15 of the second portion P2, reflecting the above-mentioned arrangement of the first and second portions P1, P2. Specifically, the first and second portions P1, P2 extend in substantially orthogonal directions.
[0036] like Figure 2 As shown, connecting portion P3 connects the ends of first portion P1 and second portion P2. In other words, connecting portion P3 is the portion of joint 13 excluding the pair of first portions P1 and the pair of second portions P2. Connecting portion P3 is generally L-shaped, including the corners of joint 13, when viewed from above.
[0037] The four connecting portions P3 are located at the four corners of the overlapping metal foils. Reflecting the shape of the corners of the metal foils, the outer periphery 15 of the connecting portion P3 is formed by two straight lines connected at right angles. Meanwhile, the inner periphery 14 of the connecting portion P3 is formed by two arc-shaped curves connected together. The inner periphery 14 of the connecting portion P3 is described in detail below.
[0038] (Regarding the inner periphery of the joint)
[0039] like Figure 2 As shown, the portion of the inner circumference 14 of the connecting portion P3 connected to the first portion P1 is an arcuate shape convex toward the second portion P2. In addition, the portion of the inner circumference 14 of the connecting portion P3 connected to the second portion P2 is an arcuate shape convex toward the first portion P1.
[0040] Here, a first virtual straight line L1 and a second virtual straight line L2 are assumed as virtual straight lines that include specific edges of the inner periphery 14 of the joint 13. The first virtual straight line L1 is a straight line that includes the inner periphery 14 of the first portion P1. The second virtual straight line L2 is a straight line that includes the inner periphery 14 of the second portion P2. The first virtual straight line L1 and the second virtual straight line L2 are orthogonal to each other. In addition, Figure 2 In , each virtual straight line is shown by a dotted line segment. Figure 2 For convenience, the virtual straight lines and the inner periphery 14 are shown not to coincide with each other.
[0041] The inner peripheral edge 14 of the connecting portion P3 is located on the opposite side of the center of the main surface MF relative to the first virtual straight line L1, or on the opposite side of the center of the main surface MF relative to the second virtual straight line L2. That is, the inner peripheral edge 14 of the connecting portion P3 is located on the side of the outer peripheral edge 15 of the first portion P1 relative to the first virtual straight line L1, or on the side of the outer peripheral edge 15 of the second portion P2 relative to the second virtual straight line L2. In other words, the inner peripheral edge 14 of the connecting portion P3 does not exist in the area closer to the center of each metal foil relative to the first virtual straight line L1 or closer to the center of each metal foil relative to the second virtual straight line L2. Furthermore, the point on the inner peripheral edge 14 of the connecting portion P3 that is closest to the outer peripheral edge 15 of the bonding portion 13 is designated as the specific point SP. In this case, the specific point SP is located on the side of the outer peripheral edge 15 of the first portion P1 relative to the first virtual straight line L1 and on the side of the outer peripheral edge 15 of the second portion P2 relative to the second virtual straight line L2.
[0042] Reflecting the shape of the inner periphery 14 of the connection portion P3, the minimum width dimension Wmin of the connection portion P3 is smaller than the minimum width dimension W of the first portion P1 and the minimum width dimension W of the second portion P2. In other words, the width dimension W of the joint 13 is minimized within the connection portion P3. In this embodiment, the width dimension W of the connection portion P3 reaches its minimum width dimension Wmin at the specific point SP described above. Furthermore, the minimum width dimension Wmin of the connection portion P3 is at least 1 / 2 and no more than 4 / 5 of the minimum width dimension W of the first portion P1 and the minimum width dimension W of the second portion P2.
[0043] (Regarding the manufacturing method)
[0044] Next, a method for manufacturing the electronic component package 10 will be described. Figure 3 As shown, the method for manufacturing the electronic component package 10 includes a preparation step S10 and a bonding step S11 .
[0045] In the preparation step S10, Figure 4 As shown, first metal foil 11, second metal foil 12, and electronic components EC are prepared. Examples of electronic components EC include chip components for computing devices, batteries, inductors, capacitors, thermistors, and the like. In this state, first metal foil 11 does not have first joining portion 11A. Second metal foil 12 does not have second joining portion 12A. Next, electronic components EC are placed on the main surface of second metal foil 12. The first and second metal foils 11 and 12 are then overlapped so that they face each other.
[0046] After the preparation step S10, the joining step S11 is performed. The outer edge of the first metal foil 11 and the outer edge of the second metal foil 12 are joined. Specifically, the outer edge of the first metal foil 11 is output with a laser to melt and weld the metal foils. At this time, the laser is controlled so that the trajectory of the laser deviates toward the outside of each metal foil as it approaches the corner of each metal foil. As a result, the first metal foil 11 and the second metal foil 12 are melted into a quadrilateral along the trajectory of the laser. At the same time, the fused surface of the first metal foil 11 and the fused surface of the second metal foil 12 are welded. The melted portion of the first metal foil 11 and the melted portion of the second metal foil 12 become a solid joint 13 due to the decrease in temperature. That is, the joint 13 that joins the outer edge of the first metal foil 11 and the outer edge of the second metal foil 12 is formed integrally. That is, the joint 13 that joins the outer edge of the first metal foil 11 and the outer edge of the second metal foil 12 is formed integrally.
[0047] Furthermore, by controlling the laser trajectory as described above, the inner periphery 14 of the connecting portion P3 becomes a shape formed by connecting two arc-shaped curves. Furthermore, the outer periphery 15 of the joint 13 becomes a quadrilateral. Specifically, the inner periphery 14 of the connecting portion P3 is located on the outer periphery 15 side of the first portion P1 relative to the first virtual straight line L1, or on the outer periphery 15 side of the second portion P2 relative to the second virtual straight line L2. The electronic component package 10 is manufactured using the above method.
[0048] (Effects of this embodiment)
[0049] (1) In the above embodiment, the inner peripheral edge 14 of the connecting portion P3 is located on the side of the outer peripheral edge 15 of the first portion P1 relative to the first virtual straight line L1, or on the side of the outer peripheral edge 15 of the second portion P2 relative to the second virtual straight line L2. In other words, the inner peripheral edge 14 of the connecting portion P3 is located farther from the center of each metal foil than the respective virtual straight lines. Thus, even when the outer edges of the metal foils are welded while the electronic component EC is positioned between the first metal foil 11 and the second metal foil 12, heat transfer from the connecting portion P3 of the joint 13 to the electronic component EC within the enclosed space can be suppressed.
[0050] (2) In the above embodiment, the specific point SP is located on the outer edge 15 side of the first portion P1 relative to the first virtual straight line L1, or on the outer edge 15 side of the second portion P2 relative to the second virtual straight line L2. That is, the specific point SP is located near the corner of each metal foil. When stress, which causes the first and second metal foils 11 and 12 to separate due to air expansion within the enclosed space, acts on the inner edge 14 of the joint 13, this stress tends to concentrate at the specific point SP. Therefore, if the metal foils separate from each other, the likelihood of separation starting from this specific point SP is high. Therefore, the connecting portion P3 of the joint 13 functions as a pressure relief valve for overpressure within the enclosed space of the electronic component package 10. On the other hand, if the metal foils separate from each other at the first or second portion P2 of the joint 13, the separation tends to spread throughout the entire joint 13, following the linear shape of the first and second portions P1 and P2. In this regard, by intentionally facilitating separation at the connection portion P3 as described above, even if separation between the metal foils occurs, the separation can be prevented from spreading widely.
[0051] (3) In the above embodiment, the minimum width dimension Wmin of the connection portion P3 is smaller than the minimum width dimension W of the first portion P1 and the minimum width dimension W of the second portion P2. This can significantly suppress the transfer of heat from the connection portion P3 of the joint 13 to the electronic component EC in the enclosed space.
[0052] (4) In the above embodiment, the minimum width dimension Wmin of the connecting portion P3 is not less than 1 / 2 and not more than 4 / 5 of the minimum width dimension W of the first portion P1. By setting the minimum width dimension Wmin of the connecting portion P3 to not less than 1 / 2 of the minimum width dimension W of the first portion P1, the strength of the joint can be ensured. If the minimum width dimension Wmin of the connecting portion P3 is not more than 4 / 5 of the minimum width dimension W of the first portion P1, heat transfer to the electronic component EC in the enclosed space can be easily suppressed. Therefore, the minimum width dimension Wmin of the connecting portion P3 is preferably within the above numerical range.
[0053] <Change Example>
[0054] The above embodiment can be modified and implemented as follows: The above embodiment and the following modified examples can be implemented in combination with each other within the scope of no technical contradiction.
[0055] The shape and material of the first metal foil 11 are not limited to the examples in the above embodiment. For example, the four corners of the first metal foil 11 may be curved. The material of the first metal foil 11 may also be iron, aluminum, copper, etc. The same applies to the second metal foil 12. Furthermore, the material of the first metal foil 11 and the material of the second metal foil 12 may be different.
[0056] The electronic component package 10 may include a third metal foil in addition to the first metal foil 11 and the second metal foil 12. In this case, the joining portion 13 may join the outer edges of the three metal foils.
[0057] When viewed in a direction perpendicular to the main surface MF, the shape of the outer periphery 15 of the joint 13 does not need to be a quadrilateral. Furthermore, the shape of the inner periphery 14 of the joint 13 does not need to be substantially quadrilateral. For example, the inner periphery 14 of the connecting portion P3 may be curved or polygonal. Regardless of the combination of the shapes of the inner periphery 14 and the outer periphery 15, it is sufficient that the inner periphery 14 of the connecting portion P3 is located on the side of the outer periphery 15 of the first portion P1 relative to the first virtual straight line L1 or on the side of the outer periphery 15 of the second portion P2 relative to the second virtual straight line L2.
[0058] The first portion P1 does not need to be substantially rectangular. That is, the inner periphery 14 of the first portion P1 does not need to be entirely straight, but may be partially curved. This also applies to the second portion P2.
[0059] The first portion P1 and the second portion P2 do not need to extend in mutually orthogonal directions. As long as the first portion P1 and the second portion P2 extend in different directions, the inner periphery 14 of the connecting portion P3 connecting them can have the same structure as in the above embodiment.
[0060] The inner periphery 14 of the connecting portion P3 may be located on either the outer periphery 15 side of the first portion P1 relative to the first virtual straight line L1 or the outer periphery 15 side of the second portion P2 relative to the second virtual straight line L2.
[0061] The specific point SP does not need to be located on the outer periphery 15 side of the first portion P1 relative to the first virtual straight line L1 and on the outer periphery 15 side of the second portion P2 relative to the second virtual straight line L2. For example, the specific point SP may be located on the outer periphery 15 side of the first portion P1 relative to the first virtual straight line L1 and on the second virtual straight line L2.
[0062] The width W of the joint 13 does not have to be minimum at the connection portion P3. For example, the width W may be substantially constant throughout the entire first portion P1, second portion P2, and connection portion P3. Alternatively, the width W may be locally minimum at the first portion P1. However, even in such cases, the minimum width Wmin at the connection portion P3 is preferably smaller than the width W at the boundary between the connection portion P3 and the first portion P1.
[0063] The minimum width dimension Wmin of the connecting portion P3 may be less than 1 / 2 of the minimum width dimension W of the first portion P1, or may be greater than 4 / 5. Even in such a case, as long as the inner periphery 14 of the connecting portion P3 is located on the side of the outer periphery 15 of the first portion P1 relative to the first virtual straight line L1 or on the side of the outer periphery 15 of the second portion P2 relative to the second virtual straight line L2, the thermal influence on the electronic components EC within the enclosed space can be suppressed.
[0064] In the electronic component package 10, at least with respect to one connecting portion P3 and the first portion P1 and the second portion P2 connected to the connecting portion P3, it is sufficient that the inner peripheral edge 14 of the connecting portion P3 is located on the side of the outer peripheral edge 15 of the first portion P1 relative to the first virtual straight line L1 or on the side of the outer peripheral edge 15 of the second portion P2 relative to the second virtual straight line L2.
[0065] In the preparation step S10 , it is not necessary to prepare two metal foils. For example, a single metal foil may be folded, overlapped, and joined. In this case, the three outer edges excluding the folded-back sides may be joined.
[0066] In the bonding step S11, the method for forming the bonded portion 13 is not limited to the example of the above embodiment. For example, the total amount of energy output to the corners of the quadrilateral outer periphery 15 of the bonded portion 13 to be formed may be reduced by accelerating the moving speed of the laser beam.
[0067] Furthermore, for example, the total amount of energy outputted from the laser may be reduced when the laser's aiming point is at a corner of the outer edge of the metal foil, compared to when the laser's aiming point is at a straight portion of the outer edge. Specifically, the total amount of energy outputted from the laser may be reduced to half when the laser's aiming point is at a corner of the quadrilateral outer periphery 15 of the bonded portion 13 to be formed by the laser, compared to when the laser's aiming point is at a straight portion of the outer periphery 15.
[0068] Alternatively, for example, the metal foils may be joined using a laser with an elliptical irradiation range. The laser welds the intersection of two ellipses at the corners of the metal foils, so that the inner periphery 14 of the connecting portion P3 becomes a shape formed by connecting two arc-shaped curves.
[0069] Notes
[0070] The technical ideas that can be grasped from the above-mentioned embodiment and modified examples are described.
[0071] [1] A package for an electronic component, comprising: a first metal foil; a second metal foil overlapping the first metal foil; a joint portion formed by joining the outer edge portion of the first metal foil and the outer edge portion of the second metal foil, wherein, when the edge of the edge of the joint portion located on the center side of the main surface of the first metal foil is taken as the inner peripheral edge, the joint portion comprises: a first portion, the inner peripheral edge of which is linear; a second portion, the inner peripheral edge of which is linear and extends in a direction different from that of the first portion; and a connecting portion connecting the end portion of the first portion and the end portion of the second portion, wherein, when a first virtual straight line including the inner peripheral edge of the first portion and a second virtual straight line including the inner peripheral edge of the second portion are assumed, the inner peripheral edge of the connecting portion is located on the opposite side of the center of the main surface relative to the first virtual straight line or on the opposite side of the center of the main surface relative to the second virtual straight line.
[0072] [2] A package for an electronic component according to [1], wherein, when the edge of the edge of the joint portion that is located on the opposite side of the center of the main surface relative to the inner periphery is taken as the outer periphery, and the point on the inner periphery of the connecting portion that is closest to the outer periphery is taken as the specific point, the specific point is located on the outer periphery side of the first portion relative to the first virtual straight line, and is located on the outer periphery side of the second portion relative to the second virtual straight line.
[0073] [3] A package for an electronic component according to [1] or [2], wherein, when the edge of the edge of the joint portion located on the opposite side of the center of the main surface relative to the inner periphery is taken as the outer periphery, and the shortest distance from any point on the outer periphery to the inner periphery of the joint portion is taken as the width dimension of the joint portion, the smallest width dimension in the connecting portion is smaller than the smallest width dimension in the first portion and the smallest width dimension in the second portion.
[0074] [4] The electronic component package according to [3], wherein the smallest width dimension in the connecting portion is not less than 1 / 2 and not more than 4 / 5 of the smallest width dimension in the first portion.
[0075] [5] A method for manufacturing a package for an electronic component, comprising: a preparation step, in which a first metal foil and a second metal foil overlapping the first metal foil are prepared; and a joining step, in which an outer edge portion of the first metal foil and an outer edge portion of the second metal foil are joined by a laser to form a joining portion, an edge of the joining portion located on the center side of the main surface of the first metal foil being used as an inner peripheral edge, a portion of the joining portion where the inner peripheral edge is linear being used as a first portion, and a portion where the inner peripheral edge is linear and faces a direction different from that of the first portion. The part extending toward the bottom is taken as the second part, and the part connecting the end of the above-mentioned first part and the end of the above-mentioned second part is taken as the connecting part. When it is assumed that there is a first virtual straight line including the above-mentioned inner periphery of the above-mentioned first part and a second virtual straight line including the above-mentioned inner periphery of the above-mentioned second part, in the above-mentioned joining process, the above-mentioned outer edge portion of the above-mentioned first metal foil and the above-mentioned outer edge portion of the above-mentioned second metal foil are joined so that the above-mentioned inner periphery of the above-mentioned connecting part is located on the opposite side of the center of the above-mentioned main surface relative to the above-mentioned first virtual straight line or on the opposite side of the center of the above-mentioned main surface relative to the above-mentioned second virtual straight line.
Claims
1. A package for electronic components, characterized in that: have: a first metal foil; a second metal foil overlapping the first metal foil; and The joining portion is a portion where the outer edge of the first metal foil and the outer edge of the second metal foil are joined. When the edge of the edge of the bonding portion located on the center side of the main surface of the first metal foil is defined as the inner peripheral edge, The joint portion comprises: In the first part, the inner periphery is a straight line; a second portion, wherein the inner periphery is linear and extends in a direction different from that of the first portion; and a connecting portion connecting an end portion of the first portion and an end portion of the second portion, When a first virtual straight line including the inner peripheral edge of the first portion and a second virtual straight line including the inner peripheral edge of the second portion are assumed, The inner peripheral edge of the connecting portion is located on the opposite side of the center of the main surface with respect to the first virtual straight line or on the opposite side of the center of the main surface with respect to the second virtual straight line.
2. The electronic component package according to claim 1, wherein When the edge of the joining portion that is located on the opposite side of the center of the main surface with respect to the inner peripheral edge is defined as the outer peripheral edge, and the point on the inner peripheral edge of the connecting portion that is closest to the outer peripheral edge is defined as the specific point, The specific point is located on the outer periphery side of the first portion with respect to the first virtual straight line, and is located on the outer periphery side of the second portion with respect to the second virtual straight line.
3. The electronic component package according to claim 1, wherein When the edge of the junction portion located on the opposite side of the center of the main surface relative to the inner peripheral edge is taken as the outer peripheral edge, and the shortest distance from any point on the outer peripheral edge to the inner peripheral edge of the junction portion is taken as the width dimension of the junction portion, The smallest width dimension in the joining portion is smaller than the smallest width dimension in the first portion and the smallest width dimension in the second portion.
4. The electronic component package according to claim 3, wherein The smallest width dimension of the connecting portion is not less than 1 / 2 and not more than 4 / 5 of the smallest width dimension of the first portion.