Electronic component package and method for manufacturing an electronic component package

Abstract

To solve a problem in which the heat generated when joining a metal foil is easily transferred to an electronic component.SOLUTION: An electronic component package 10 includes a first metal foil 11, a second metal foil overlapping with the first metal foil 11, and a joint 13 where an outer edge of the first metal foil 11 and an outer edge of the second metal foil are joined. The joint 13 includes a first portion P1, a second portion P2, and a connecting portion P3. When a first imaginary straight line including an inner periphery 14 of the first portion P1 is L1 and a second imaginary straight line including an inner periphery 14 of the second portion P2 is L2, the inner periphery 14 of the connecting portion P3 is located on the opposite side of the first imaginary straight line L1 from the center of the main surface MF, or on the opposite side of the second imaginary straight line L2 from the center of the main surface MF.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a package for electronic components and a method for manufacturing the package 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 rectangular in plan view. 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 coincide with each other. Further, the package for electronic components includes a joint portion where the outer edge portion of the first metal foil and the outer edge portion of the second metal foil are welded. The joint portion is a rectangular ring extending along the edges of each metal foil. A sealed space is defined by the first metal foil and the second metal foil. An electronic component is stored in the sealed space.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the package for electronic components as described in Patent Document 1, when an electronic component is disposed between the first metal foil and the second metal foil, the outer edge portions of each metal foil may be welded. At this time, the heat generated when welding both metal foils may be transmitted to the electronic component, which may have an adverse effect on the electronic component. In particular, the corner portions of the rectangular shape of each metal foil are likely to concentrate heat during welding. Therefore, there is a need for a structure of a package for electronic components in which heat during welding is difficult to be transmitted to the electronic component.

Means for Solving the Problems

[0005] To solve the above problems, the present invention provides an electronic component package comprising: a first metal foil; a second metal foil overlapping the first metal foil; and a joint portion which is a portion where the outer edge of the first metal foil and the outer edge of the second metal foil are joined, wherein when the edge of the joint portion located on the side of the center of the main surface of the first metal foil is defined as the inner peripheral edge, the joint portion comprises: a first portion in which the inner peripheral edge is straight; a second portion in which the inner peripheral edge is straight and extends in a direction different from that of the first portion; and a connecting portion which connects the end of the first portion and the end 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 defined, 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.

[0006] Furthermore, the present invention comprises a preparation step of preparing a first metal foil and a second metal foil overlapping the first metal foil, and a joining step of forming a joint by joining the outer edge of the first metal foil and the outer edge of the second metal foil with a laser, wherein the edge of the joint that is located on the side of the main surface of the first metal foil is defined as the inner peripheral edge, the portion of the joint in which the inner peripheral edge is straight is defined as the first portion, and the portion in which the inner peripheral edge is straight and extends in a direction different from the first portion is defined as the second portion, and the The method for manufacturing an electronic component package involves joining the outer edge of the first metal foil and the outer edge of the second metal foil in the joining process, where the portion connecting the end of the first portion and the end of the second portion is defined as the connecting portion, and 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, such that 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. [Effects of the Invention]

[0007] The heat generated when joining the metal foils is less likely to be transferred to the electronic components. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a perspective view of an electronic component package. [Figure 2] Figure 2 is a magnified view of a portion of an electronic component package. [Figure 3] Figure 3 is a flowchart of the manufacturing method for electronic component packages. [Figure 4] Figure 4 is an explanatory diagram of a method for manufacturing electronic component packages. [Modes for carrying out the invention]

[0009] <An embodiment of an electronic component package and its manufacturing method> The following describes one embodiment of an electronic component package and its manufacturing method. Note that the drawings are schematic diagrams for ease of understanding, and some components may be enlarged or omitted. Therefore, the dimensional ratios of the components may differ from those of the actual components.

[0010] (Regarding the overall structure) As shown in Figure 1, the electronic component package 10 comprises a first metal foil 11 and a second metal foil 12.

[0011] The first metal foil 11 is a roughly rectangular 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 surfaces of the first metal foil 11 with the largest surface area.

[0012] The first metal foil 11 has a first joint 11A and a first non-joint 11B. The first joint 11A is the portion of the first metal foil 11 that is joined to the second metal foil 12. The first joint 11A extends over the entire outer edge of the first metal foil 11. That is, the first joint 11A is a roughly rectangular annular shape. In the following, the edge of the first joint 11A that is located on the side of the center of the main surface MF of the first metal foil 11 will be referred to as the inner peripheral edge 14. The edge of the first joint 11A that, when viewed in a direction perpendicular to the main surface MF, is located on the opposite side of the center of the main surface MF from the inner peripheral edge 14 will be referred to as the outer peripheral edge 15. The shape of the inner peripheral edge 14 is roughly rectangular overall. The outer peripheral edge 15 coincides with the outer edge of the first metal foil 11. Therefore, the shape of the outer peripheral edge 15 is rectangular.

[0013] The first non-joint portion 11B is the part of the first metal foil 11 that is not joined to the second metal foil 12. In other words, the first non-joint portion 11B is the part of the first metal foil 11 that is surrounded by the inner peripheral edge 14 of the first joint portion 11A. Therefore, the first non-joint portion 11B has a roughly rectangular planar shape. Furthermore, the first non-joint portion 11B is separable from the second metal foil 12. The center of the first non-joint portion 11B coincides with the center of the main surface MF of the first metal foil 11.

[0014] As shown in Figure 1, the second metal foil 12 is a substantially rectangular foil. The material of the second metal foil 12 is stainless steel. The second metal foil 12 has a second joint portion 12A and a second non-joint portion 12B. The second joint portion 12A is the portion of the second metal foil 12 that is joined to the first metal foil 11. The second joint portion 12A extends over substantially the entire outer edge of the second metal foil 12. That is, the second joint portion 12A is a substantially rectangular annular shape. The shape of the second joint portion 12A is the same as that of the first joint portion 11A. Therefore, the shape of the inner peripheral edge 14 of the second joint portion 12A is substantially rectangular. Also, the shape of the outer peripheral edge 15 of the second joint portion 12A is rectangular.

[0015] Further, the second non-bonding portion 12B is the portion of the second metal foil 12 that is not bonded to the first metal foil 11. In other words, the second non-bonding portion 12B is the portion of the second metal foil 12 surrounded by the inner peripheral edge 14 of the second bonding portion 12A. And the second non-bonding portion 12B can be separated from the first metal foil 11. The shape of the second non-bonding portion 12B is the same as that of the first non-bonding portion 11B.

[0016] With the above configuration, the package 10 for electronic components has a sealed space partitioned by the first metal foil 11 and the second metal foil 12. Although not shown in FIG. 1, the package 10 for electronic components stores a predetermined electronic component EC in the sealed space.

[0017] Note that the first metal foil 11 and the second metal foil 12 are welded in the bonding step S11 described later. Therefore, the first bonding portion 11A is the portion where the first metal foil 11 is melted. The second bonding portion 12A is the portion where the second metal foil 12 is melted. And the first bonding portion 11A and the second bonding portion 12A are an integral body joined to each other. Therefore, there may be cases where a clear boundary cannot be observed between the first bonding portion 11A and the second bonding portion 12A.

[0018] Hereinafter, the integral body of the first bonding portion 11A and the second bonding portion 12A is referred to as the bonding portion 13. Also, the inner peripheral edge 14 of the first bonding portion 11A and the second bonding portion 12A is described as the inner peripheral edge 14 of the bonding portion 13. Similarly, the outer peripheral edge 15 of the first bonding portion 11A and the second bonding portion 12A is described as the outer peripheral edge 15 of the bonding portion 13. Therefore, the bonding portion 13 is the portion where the outer edge portion of the first metal foil 11 and the outer edge portion of the second metal foil 12 are joined. The material of the bonding portion 13 is the same as the materials of the first metal foil 11 and the second metal foil 12.

[0019] (Regarding the shape of the bonding portion) As described above, the first bonding portion 11A and the second bonding portion 12A have become the bonding portion 13 joined to each other. Therefore, hereinafter, the shapes of the first bonding portion 11A and the second bonding portion 12A are described as the shape of the bonding portion 13.

[0020] As shown in FIG. 1, the joint portion 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 in plan. In the first portion P1, the inner peripheral edge 14 and the outer peripheral edge 15 extend substantially parallel to each other. Therefore, the first portion P1 is elongated and rectangular when viewed in plan. Here, as shown in FIG. 2, the shortest distance from an arbitrary point on the outer peripheral edge 15 to the inner peripheral edge 14 is defined as the width dimension W of the joint portion 13. As described above, since the inner peripheral edge 14 and the outer peripheral edge 15 of the first portion P1 are parallel to each other, the width dimension W of the first portion P1 is substantially the same throughout the first portion P1.

[0021] As shown in FIG. 1, the pair of first portions P1 are along two sides of the first metal foil 11 that extend substantially parallel to each other when viewed in plan. Therefore, the pair of first portions P1 extend substantially parallel to each other. However, each first portion P1 does not reach the four corner portions of the first metal foil 11.

[0022] The second portion P2 is a portion extending along a side of the first metal foil 11 where the first portion P1 is not provided when viewed in plan. In the second portion P2, the inner peripheral edge 14 and the outer peripheral edge 15 extend substantially parallel to each other. Therefore, the second portion P2 is elongated and rectangular when viewed in plan. As described above, since the inner peripheral edge 14 and the outer peripheral edge 15 of the second portion P2 are parallel to each other, the width dimension W of the second portion P2 is substantially constant throughout the second portion P2. Also, the width dimension W of the second portion P2 is substantially equal to the width dimension W of the first portion P1.

[0023] The pair of second portions P2 are two sides of the first metal foil 11 that extend substantially parallel to each other when viewed in plan and along which 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 corner portions of the first metal foil 11.

[0024] Reflecting the arrangement of the first part P1 and the second part P2 as described above, the inner periphery 14 and outer periphery 15 of the first part P1 extend in directions different from those of the inner periphery 14 and outer periphery 15 of the second part P2. Specifically, the first part P1 and the second part P2 extend in directions that are approximately perpendicular to each other.

[0025] As shown in Figure 2, the connecting portion P3 is the portion that connects the ends of the first portion P1 and the ends of the second portion P2. In other words, the connecting portion P3 is the portion of the joint 13 excluding the pair of first portions P1 and the pair of second portions P2. In plan view, the connecting portion P3 is approximately L-shaped, including the corner of the joint 13.

[0026] The four connecting sections P3 are located at the four corners of each overlapping metal foil. The outer edge 15 of the connecting section P3 has a shape resembling two straight lines joined at a right angle, reflecting the shape of the corners of each metal foil. On the other hand, the inner edge 14 of the connecting section P3 has a shape resembling two connected arc-shaped curves. This inner edge 14 of the connecting section P3 will be described in detail below.

[0027] (Regarding the inner edge of the joint) As shown in Figure 2, the portion of the inner periphery 14 of the connecting portion P3 that is connected to the first portion P1 is a convex arc shape toward the second portion P2. Similarly, the portion of the inner periphery 14 of the connecting portion P3 that is connected to the second portion P2 is a convex arc shape toward the first portion P1.

[0028] Here, we hypothesize two imaginary lines, L1 and L2, which include specific sides of the inner perimeter 14 of the joint 13. The first imaginary line L1 is a line that includes the inner perimeter 14 of the first part P1. The second imaginary line L2 is a line that includes the inner perimeter 14 of the second part P2. The first imaginary line L1 and the second imaginary line L2 are orthogonal to each other. In Figure 2, each imaginary line is shown as a dashed line segment. Also, for convenience, in Figure 2, the imaginary lines and the inner perimeter 14 are shown so as not to overlap.

[0029] The inner periphery 14 of the connecting portion P3 is located on the opposite side of the center of the main surface MF with respect to the first virtual line L1, or on the opposite side of the center of the main surface MF with respect to the second virtual line L2. That is, the inner periphery 14 of the connecting portion P3 is located on the side of the outer periphery 15 of the first portion P1 with respect to the first virtual line L1, or on the side of the outer periphery 15 of the second portion P2 with respect to the second virtual line L2. In other words, the inner periphery 14 of the connecting portion P3 does not exist in the region on the center side of each metal foil with respect to the first virtual line L1, or on the center side of each metal foil with respect to the second virtual line L2. Furthermore, among the points on the inner periphery 14 of the connecting portion P3, the point closest in distance to the outer periphery 15 of the joint portion 13 is designated as point SP. In this case, point SP is located on the side of the outer periphery 15 of the first portion P1 with respect to the first virtual line L1, and on the side of the outer periphery 15 of the second portion P2 with respect to the second virtual line L2.

[0030] Reflecting the shape of the inner periphery 14 of the connecting portion P3 described above, the minimum width dimension Wmin in the connecting portion P3 is smaller than the minimum width dimension W in the first portion P1 and the minimum width dimension W in the second portion P2. In other words, the width dimension W of the joint 13 is minimized within the range of the connecting portion P3. In this embodiment, at the specific point SP described above, the width dimension W of the connecting portion P3 is the minimum width dimension Wmin. Furthermore, the minimum width dimension Wmin in the connecting portion P3 is at least 1 / 2 and at least 4 / 5 of the minimum width dimension W in the first portion P1 and the minimum width dimension W in the second portion P2.

[0031] (Regarding the manufacturing method) Next, a method for manufacturing the electronic component package 10 will be described. As shown in Figure 3, the method for manufacturing the electronic component package 10 comprises a preparation step S10 and a bonding step S11.

[0032] In preparation step S10, as shown in Figure 4, the first metal foil 11, the second metal foil 12, and the electronic component EC are prepared. The electronic component EC is, for example, a chip component such as a computing device, a battery, an inductor, a capacitor, a thermistor, etc. At this stage, the first metal foil 11 does not have a first joint 11A, and the second metal foil 12 does not have a second joint 12A. Next, the electronic component EC is placed on the main surface of the second metal foil 12. Then, the first metal foil 11 and the second metal foil 12 are overlapped so that they face each other.

[0033] Following 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, a laser is output to the outer edge of the first metal foil 11 to perform cutting and welding of each metal foil. At this time, the laser is controlled so that the laser trajectory deviates outward from 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 cut into a square shape along the laser trajectory. At the same time, the molten surfaces of the first metal foil 11 and the second metal foil 12 are welded together. The molten portions of the first metal foil 11 and the second metal foil 12 become a solid joint 13 as the temperature decreases. That is, a joint 13 that joins the outer edge of the first metal foil 11 and the outer edge of the second metal foil 12 is integrally formed.

[0034] Furthermore, by controlling the laser trajectory as described above, the shape of the inner peripheral edge 14 of the connecting portion P3 becomes a shape resembling two connected arc-shaped curves. In addition, the shape of the outer peripheral edge 15 of the joint portion 13 becomes a square shape. That is, the inner peripheral edge 14 of the connecting portion P3 is positioned on the side of the outer peripheral edge 15 of the first portion P1 with respect to the first virtual line L1 described above, or on the side of the outer peripheral edge 15 of the second portion P2 with respect to the second virtual line L2. The electronic component package 10 is manufactured by the above method.

[0035] (Regarding the effects of this embodiment) (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 with respect to the first virtual line L1, or on the side of the outer peripheral edge 15 of the second portion P2 with respect to the second virtual line L2. In other words, the inner peripheral edge 14 of the connecting portion P3 is located at a point further away from the center of each metal foil than each virtual line. As a result, even if the outer edges of each metal foil are welded with the electronic component EC placed between the first metal foil 11 and the second metal foil 12, the transfer of heat from the connecting portion P3 of the joint 13 to the electronic component EC in the sealed space can be suppressed.

[0036] (2) In the above embodiment, the specific point SP is located on the outer peripheral edge 15 side of the first portion P1 with respect to the first virtual line L1, or on the outer peripheral edge 15 side of the second portion P2 with respect to the second virtual line L2. That is, the specific point SP is located near the corner portion of each metal foil. When the air in the sealed space expands and stress acts on the inner peripheral edge 14 of the joint 13 in a way that causes the first metal foil 11 and the second metal foil 12 to separate, this stress tends to concentrate at the specific point SP. Therefore, if the metal foils were to separate from each other, it is highly likely that the separation would start from the specific point SP. Accordingly, the connecting portion P3 of the joint 13 functions as a pressure relief valve against overpressure in the sealed space of the electronic component package 10. On the other hand, if the metal foils separate from each other at the first portion P1 or the second portion P2 of the joint 13, the separation tends to spread throughout the entire structure in accordance with the linear shapes of the first portion P1 and the second portion P2. In this regard, by deliberately making the connecting portion P3 prone to delamination as described above, even if delamination occurs between the metal foils, it is possible to prevent the delamination from spreading widely.

[0037] (3) In the above embodiment, the minimum width dimension Wmin in the connecting portion P3 is smaller than the minimum width dimension W in the first portion P1 and the minimum width dimension W in the second portion P2. This makes it possible to more significantly suppress the transfer of heat from the connecting portion P3 of the joint 13 to the electronic components EC in the sealed space.

[0038] (4) In the above embodiment, the minimum width dimension Wmin in the connecting portion P3 is 1 / 2 or more and 4 / 5 or less of the minimum width dimension W in the first portion P1. The strength of the joint can be ensured by the minimum width dimension Wmin in the connecting portion P3 being 1 / 2 or more of the minimum width dimension W in the first portion P1. When the minimum width dimension Wmin in the connecting portion P3 is 4 / 5 or less of the minimum width dimension W in the first portion P1, it is easier to suppress the transfer of heat to the electronic components EC in the sealed space. Therefore, it is preferable that the minimum width dimension Wmin in the connecting portion P3 be within the above numerical range.

[0039] <Example of changes> The above embodiment can be implemented with the following modifications. The above embodiment and the following modifications can be combined with each other to the extent that they do not contradict each other technically.

[0040] The shape and material of the first metal foil 11 are not limited to the examples of 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 be iron, aluminum, copper, etc. The same applies to the second metal foil 12. Also, the material of the first metal foil 11 and the material of the second metal foil 12 do not have to be the same.

[0041] The electronic component package 10 may have a third metal foil in addition to the first metal foil 11 and the second metal foil 12. In this case, the joint 13 only needs to join the outer edges of the three metal foils together.

[0042] When viewed in a direction perpendicular to the main surface MF, the shape of the outer peripheral edge 15 of the joint 13 does not have to be rectangular. Also, the shape of the inner peripheral edge 14 of the joint 13 does not have to be approximately rectangular. For example, the inner peripheral edge 14 of the connecting portion P3 may be curved or polygonal. Regardless of the combination of the shapes of the inner peripheral edge 14 and the outer peripheral edge 15, 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 with respect to the first virtual line L1, or on the side of the outer peripheral edge 15 of the second portion P2 with respect to the second virtual line L2.

[0043] The first part P1 does not have to be approximately rectangular. That is, the inner periphery 14 of the first part P1 does not have to be straight throughout its entire length, and may be curved in part. The same applies to the second part P2.

[0044] The first part P1 and the second part P2 do not necessarily have to extend in directions perpendicular to each other. If the first part P1 and the second part P2 extend in different directions, the same configuration as in the above embodiment can be adopted at the inner peripheral edge 14 of the connecting part P3 that connects them.

[0045] The inner peripheral edge 14 of the connecting portion P3 only needs to be located on either 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.

[0046] The specific point SP does not have to be located on the outer edge 15 side of the first part P1 with respect to the first virtual line L1, and on the outer edge 15 side of the second part P2 with respect to the second virtual line L2. For example, the specific point SP may be located on the outer edge 15 side of the first part P1 with respect to the first virtual line L1, and on the second virtual line L2.

[0047] The width dimension W of the joint 13 does not have to be the minimum at the connecting portion P3. For example, the width dimension W may be approximately constant throughout the first portion P1, the second portion P2, and the connecting portion P3. Alternatively, the width dimension W may be minimum at a portion of the first portion P1. However, even in such cases, it is preferable that the minimum width dimension Wmin at the connecting portion P3 is smaller than the width dimension W at the boundary between the connecting portion P3 and the first portion P1.

[0048] The minimum width dimension Wmin in the connecting portion P3 may be less than half of the minimum width dimension W in the first portion P1, or greater than 4 / 5 of it. Even in such cases, if 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 with respect to the first virtual line L1, or on the side of the outer peripheral edge 15 of the second portion P2 with respect to the second virtual line L2, the heat transfer to the electronic components EC in the sealed space can be suppressed.

[0049] In the electronic component package 10, at least one connecting portion P3 and the first portion P1 and second portion P2 connected to the connecting portion P3 are such 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 with respect to the first virtual line L1, or on the side of the outer peripheral edge 15 of the second portion P2 with respect to the second virtual line L2.

[0050] • In preparation step S10, it is not necessary to prepare two metal foils. For example, one metal foil may be folded, overlapped, and joined together. In this case, it is sufficient to join the three outer edges excluding the folded edge.

[0051] • In joining process S11, the method for forming the joint 13 is not limited to the example of the above embodiment. For example, the laser's moving speed may be increased towards the corners of the outer edge 15 of the square shape of the joint 13 to be formed, thereby controlling the total amount of energy output to those corners to be reduced.

[0052] Furthermore, for example, when the laser sight is at a corner of the outer edge of the metal foil, the total amount of energy output from the laser may be reduced compared to when the laser sight is at a straight portion of the same outer edge. Specifically, when the laser sight is at a corner of the outer edge 15 of the square shape of the joint 13 to be formed by the laser, the total amount of energy output from the laser may be reduced to less than twice the amount when it is at a straight portion of the outer edge 15.

[0053] Alternatively, for example, the metal foils may be joined using a laser with an elliptical irradiation range. By welding the area where two ellipses intersect at the corner of the metal foil using the laser, the shape of the inner periphery 14 of the connecting portion P3 becomes a shape resembling two connected arc-shaped curves.

[0054] <Note> The technical concepts that can be understood from the above embodiments and modified examples are described below. [1] An electronic component package comprising: a first metal foil; a second metal foil overlapping the first metal foil; and a joint portion which is a portion where the outer edge of the first metal foil and the outer edge of the second metal foil are joined, wherein when the edge of the joint portion located on the side of the center of the main surface of the first metal foil is defined as the inner peripheral edge, the joint portion comprises: a first portion whose inner peripheral edge is straight; a second portion whose inner peripheral edge is straight and extends in a direction different from that of the first portion; and a connecting portion which connects the end of the first portion and the end 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 defined, 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.

[0055] [2] The electronic component package according to [1], wherein the edge of the joint that is located on the opposite side of the center of the main surface from 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 peripheral edge side of the first portion with respect to the first virtual line, and on the outer peripheral edge side of the second portion with respect to the second virtual line.

[0056] [3] The electronic component package according to [1] or [2], wherein the edge of the joint that is located on the opposite side of the center of the main surface from the inner peripheral edge is defined as the outer peripheral edge, and the shortest distance from any point on the outer peripheral edge to the inner peripheral edge of the joint is defined as the width dimension of the joint, the minimum width dimension of the connecting portion is smaller than the minimum width dimension of the first portion and the minimum width dimension of the second portion.

[0057] [4] The electronic component package according to [3], wherein the minimum width dimension in the connecting portion is 1 / 2 or more and 4 / 5 or less of the minimum width dimension in the first portion. [5] A method for manufacturing an electronic component package, comprising: a preparation step of preparing a first metal foil and a second metal foil overlapping the first metal foil; and a joining step of forming a joint by joining the outer edge of the first metal foil and the outer edge of the second metal foil with a laser, wherein the edge of the joint located on the side of the main surface of the first metal foil is defined as the inner peripheral edge, the portion of the joint where the inner peripheral edge is straight is defined as the first portion, the portion where the inner peripheral edge is straight and extends in a direction different from the first portion is defined as the second portion, the portion connecting the end of the first portion and the end of the second portion is defined as the connecting portion, and 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 defined, in the joining step, the outer edge of the first metal foil and the outer edge of the second metal foil are joined such that the inner peripheral edge of the connecting portion is located on the opposite side of the main surface from the first virtual straight line, or on the opposite side of the main surface from the second virtual straight line. [Explanation of symbols]

[0058] 10…Packages for electronic components 11…First metal foil MF…Main field 13…Joint part 14…Inner periphery 15…Outer edge P1…first part P2…Second part P3…Connection part W...Width dimension Wmin…Width dimension L1…First virtual line L2…Second virtual line SP…Specific point

Claims

1. First metal foil and, The second metal foil overlapping the first metal foil, A joint portion which is the part where the outer edge of the first metal foil and the outer edge of the second metal foil are joined, Equipped with, When the edge of the joint that is located on the side of the main surface of the first metal foil that is closer to the center of the main surface of the first metal foil is defined as the inner peripheral edge, The aforementioned joint is The first portion whose inner periphery is straight, The inner periphery of the second portion is straight and extends in a direction different from that of the first portion, A connecting portion that connects the end of the first portion and the end of the second portion, Equipped with, When a first virtual line including the inner periphery of the first part and a second virtual line including the inner periphery of the second part are assumed, The inner periphery of the connecting portion is located on the opposite side of the center of the main surface with respect to the first virtual line, or on the opposite side of the center of the main surface with respect to the second virtual line. Packages for electronic components.

2. When the edge of the joint that is located on the opposite side of the center of the main surface from 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 specified point is located on the outer edge side of the first portion with respect to the first virtual line, and on the outer edge side of the second portion with respect to the second virtual line. The electronic component package according to claim 1.

3. When the edge of the joint that is located on the opposite side of the center of the main surface from the inner peripheral edge is defined as the outer peripheral edge, and the shortest distance from any point on the outer peripheral edge to the inner peripheral edge of the joint is defined as the width dimension of the joint, The minimum width dimension in the connecting portion is smaller than the minimum width dimension in the first portion and the minimum width dimension in the second portion. The electronic component package according to claim 1.

4. The minimum width dimension in the connecting portion is between 1 / 2 and 4 / 5 of the minimum width dimension in the first portion. The electronic component package according to claim 3.

5. A preparation step of preparing a first metal foil and a second metal foil overlapping the first metal foil, A joining process in which the outer edge of the first metal foil and the outer edge of the second metal foil are joined by a laser to form a joint, Equipped with, The edge of the joint that is located on the side of the main surface of the first metal foil is defined as the inner peripheral edge. Of the aforementioned joints, The portion where the inner periphery is straight is defined as the first portion. The portion of the inner periphery that is straight and extends in a direction different from the first portion is defined as the second portion. The portion connecting the end of the first portion and the end of the second portion is defined as the connecting portion. When a first virtual line including the inner periphery of the first part and a second virtual line including the inner periphery of the second part are assumed, In the joining process, the outer edge of the first metal foil and the outer edge of the second metal foil are joined such that the inner periphery of the connecting portion is located on the opposite side of the center of the main surface with respect to the first virtual line, or on the opposite side of the center of the main surface with respect to the second virtual line. A method for manufacturing electronic component packages.

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