Electronic component package

Abstract

To solve the problem that force is easily concentrated to a specific portion in an inner peripheral edge of a joint part.SOLUTION: An electronic component package 10 comprises a first metal foil 11, a second metal foil, and a joint part 13. The first metal foil 11 and the second metal foil overlap each other. The joint part 13 is a portion in which an outer edge part of the first metal foil 11 and an outer edge part of the second metal foil are joined. A first angle C1 is larger than a third angle C3. Moreover, a second angle C2 is larger than the third angle C3.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to packages for electronic components. [Background technology]

[0002] The electronic component package disclosed in Patent Document 1 includes a first metal foil and a second metal foil. The shape and size of the first metal foil are substantially the same as the shape and size of the second metal foil. The first metal foil and the second metal foil are overlapped so that their outer edges coincide with each other. The electronic component package also includes a joint portion that connects the outer edge of the first metal foil with the outer edge of the second metal foil. The joint portion extends linearly along the edges of the metal foils. A sealed space is defined by the first metal foil, the second metal foil, and the joint portion. An electronic component is stored in the sealed space. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5377763 Summary of the Invention [Problem to be solved by the invention]

[0004] In an electronic component package such as that disclosed in Patent Document 1, for example, stress may be generated on the inner periphery of the joint due to the expansion of air in the sealed space partitioned by the first metal foil and the second metal foil. If force is concentrated at a specific point on the inner periphery of the joint, the first metal foil and the second metal foil may peel off, compromising the hermeticity of the sealed space. [Means for solving the problem]

[0005] To solve the above problems, the present invention includes a first metal foil, a second metal foil overlapping the first metal foil, and a joint where the outer edge of the first metal foil and the outer edge of the second metal foil are joined. When an edge located on the center side of the main surface of the first metal foil among the edges of the joint is defined as an inner peripheral edge, the joint includes a first portion where the inner peripheral edge is linear, a second portion where the inner peripheral edge is linear and extends in a direction different from that of the first portion, and a connecting portion connecting the end of the first portion and the end of the second portion. When a first virtual straight line including the inner peripheral edge of the first portion, a second virtual straight line including the inner peripheral edge of the second portion, and a third virtual straight line which is a tangent to the inner peripheral edge of the connecting portion are imagined, the angle on the center side of the main surface among the angles formed by the third virtual straight line and the first virtual straight line is larger than the angle on the center side of the main surface among the angles formed by the first virtual straight line and the second virtual straight line, and the angle on the center side of the main surface among the angles formed by the third virtual straight line and the second virtual straight line is larger than the angle on the center side of the main surface among the angles formed by the first virtual straight line and the second virtual straight line. It is a package for electronic components.

[0006] The present invention also has a plurality of unit packages each including a first metal foil, a second metal foil overlapping the first metal foil, and a joint portion where an outer edge portion of the first metal foil and an outer edge portion of the second metal foil are joined. When an edge located on the center side of the main surface of the first metal foil among the edges of the joint portion of each unit package is defined as an inner peripheral edge, the joint portion includes a first portion where the inner peripheral edge is linear, a second portion where the inner peripheral edge is linear and extends in a direction different from that of the first portion, and a connecting portion connecting an end of the first portion and an end of the second portion. When a first virtual straight line including the inner peripheral edge of the first portion, a second virtual straight line including the inner peripheral edge of the second portion, and a third virtual straight line which is a tangent line to the inner peripheral edge of the connecting portion are assumed, an angle on the center side of the main surface among angles formed by the third virtual straight line and the first virtual straight line is larger than an angle on the center side of the main surface among angles formed by the first virtual straight line and the second virtual straight line, and an angle on the center side of the main surface among angles formed by the third virtual straight line and the second virtual straight line is larger than an angle on the center side of the main surface among angles formed by the first virtual straight line and the second virtual straight line. An edge located on the opposite side of the center of the main surface with respect to the inner peripheral edge among the edges of the joint portion of each unit package is defined as an outer peripheral edge. When the shortest distance from an arbitrary point on the outer peripheral edge to the inner peripheral edge of the joint portion is defined as the width dimension of the joint portion, the maximum width dimension in the connecting portion is larger than the maximum width dimension in the first portion. The connecting portions of the plurality of unit packages are joined to each other, and it is an electronic component package.

Advantages of the Invention

[0007] It is easy to disperse stress generated in the inner peripheral edge of the joint portion.

Brief Description of the Drawings

[0008] [Figure 1] FIG. 1 is a perspective view of an electronic component package according to the first embodiment. [Diagram 2] FIG. 2 is a partially enlarged view of the electronic component package according to the first embodiment. [Diagram 3]FIG. 3 is a flowchart of a method for manufacturing an electronic component package according to the first embodiment. [Figure 4] FIG. 4 is an explanatory diagram of a method for manufacturing an electronic component package according to the first embodiment. [Diagram 5] FIG. 5 is a perspective view of an electronic component package according to the second embodiment. [Figure 6] FIG. 6 is a perspective view of an electronic component package according to a modification example.

MODE FOR CARRYING OUT THE INVENTION

[0009] Hereinafter, a first embodiment and a second embodiment of an electronic component package will be described. Note that the drawings are schematic diagrams for easy understanding, and components may be enlarged and omitted. Therefore, the dimensional ratios of the components may be different from the actual ones.

[0010] <First Embodiment of Electronic Component Package> (Overall Configuration of the First Embodiment) As shown in FIG. 1, the electronic component package 10 includes a first metal foil 11 and a second metal foil 12.

[0011] The first metal foil 11 is a substantially 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 that has the largest area.

[0012] 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 in the shape of a substantially rectangular ring. In the following, the edge of the first bonding portion 11A that is 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 that is located on the opposite side of the center of the main surface MF with respect 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 octagonal. 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-bonded portion 11B is a portion of the first metal foil 11 that is not bonded to the second metal foil 12. In other words, the first non-bonded portion 11B is a portion of the first metal foil 11 that is surrounded by the inner peripheral edge 14 of the first bonding portion 11A. Therefore, the first non-bonded portion 11B has an octagonal planar shape. The first non-bonded portion 11B can be separated from the second metal foil 12. The center of the first non-bonded portion 11B coincides with the center of the main surface MF of the first metal foil 11.

[0014] As shown in FIG. 1, the second metal foil 12 is a foil having a substantially rectangular shape. 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-joining portion 12B. The second joint portion 12A is a 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 portion of the second metal foil 12. That is, the second joint portion 12A is an annular shape having a substantially rectangular 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 an octagonal shape. In addition, the shape of the outer peripheral edge 15 of the second joint portion 12A is a square shape.

[0015] The second non-bonded portion 12B is a portion of the second metal foil 12 that is not bonded to the first metal foil 11. In other words, the second non-bonded portion 12B is a portion of the second metal foil 12 that is surrounded by the inner peripheral edge 14 of the second bonding portion 12A. The second non-bonded portion 12B is separable from the first metal foil 11. The shape of the second non-bonded portion 12B is similar to that of the first non-bonded portion 11B.

[0016] With the above-described configuration, the electronic component package 10 has an enclosed space defined by the first metal foil 11 and the second metal foil 12. Although not shown in the drawings, the electronic component package 10 stores a predetermined electronic component EC in the enclosed space.

[0017] The first metal foil 11 and the second metal foil 12 are welded in a joining step S11 described later. Therefore, the first joint portion 11A is a portion where the first metal foil 11 is melted. The second joint portion 12A is a portion where the second metal foil 12 is melted. The first joint portion 11A and the second joint portion 12A are joined together to form an integrated body. Therefore, a clear boundary may not be observed between the first joint portion 11A and the second joint portion 12A.

[0018] In the following, the integral body of the first bonding portion 11A and the second bonding portion 12A is referred to as the bonding portion 13. The inner peripheral edge 14 of the first bonding portion 11A and the second bonding portion 12A will be 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 will be described as the outer peripheral edge 15 of the bonding portion 13. Therefore, the bonding portion 13 is the portion where the outer peripheral portion of the first metal foil 11 and the outer peripheral portion of the second metal foil 12 are bonded. The material of the bonding portion 13 is the same as the material of the first metal foil 11 and the material of the second metal foil 12.

[0019] (Regarding the shape of the joint) As described above, the first bonding portion 11A and the second bonding portion 12A are bonded to each other to form the bonding portion 13. Therefore, hereinafter, the shapes of the first bonding portion 11A and the second bonding portion 12A will be 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 in plan view. 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 has a long and narrow rectangular shape in plan view. Here, the shortest distance from any point on the outer peripheral edge 15 to the inner peripheral edge 14 is defined as the width dimension W of the joint 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] The pair of first portions P1 are located along two sides of the first metal foil 11 that extend substantially parallel to each other in a plan view. Therefore, the pair of first portions P1 extend substantially parallel to each other. However, each of the first portions P1 does not reach any of the four corners of the first metal foil 11.

[0022] The second portion P2 is a portion that extends along the side of the first metal foil 11 on which the first portion P1 is not provided when viewed in a plan view. That is, the second portion P2 is a portion that extends in a direction different from that of the first portion P1. 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 has a long and narrow rectangular shape when viewed in a plan view. 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. Moreover, 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 in a plan view, and are along two sides on which the first portion P1 is not provided. Therefore, the pair of second portions P2 extend substantially parallel to each other. However, each of the second portions P2 does not reach any of the four corners of the first metal foil 11.

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

[0025] 2, the connecting portion P3 is a portion connecting an end of the first portion P1 and an end of the second portion P2. In other words, the connecting portion P3 is a portion of the joint 13 excluding the pair of first portions P1 and the pair of second portions P2. The connecting portion P3 has a pentagonal shape including corners of the joint 13 in a plan view.

[0026] The four connecting portions P3 are located at the four corners of each of the overlapping metal foils. An inner peripheral edge 14 of the connecting portion P3 is straight. On the other hand, an outer peripheral edge 15 of the connecting portion P3 is shaped like two straight lines connected at a right angle, reflecting the shape of the corners of each metal foil.

[0027] Furthermore, the width dimension W of the connecting portion P3 is larger than the width dimension W of the first portion P1 and the width dimension W of the second portion P2. The width dimension W of the joint 13 is maximum within the range of the connecting portion P3. More specifically, the shortest distance from the approximately right-angled vertex of the joint 13 to a point on the inner peripheral edge 14 in a plan view is the maximum width dimension Wmax of the joint 13.

[0028] (About the inner edge of the joint) As shown in Fig. 2, a first virtual straight line L1, a second virtual straight line L2, and a third virtual straight line L3 are assumed as virtual straight lines including specific sides of the inner peripheral edge 14 of the joint 13. Note that in Fig. 2, each virtual straight line is shown as a chain line segment. Also, for convenience, Fig. 2 illustrates each virtual straight line and the inner peripheral edge 14 so that they do not overlap.

[0029] The first virtual straight line L1 is a straight line including the inner peripheral edge 14 of the first portion P1. The second virtual straight line L2 is a straight line including the inner peripheral edge 14 of the second portion P2. The third virtual straight line L3 is a tangent to the inner peripheral edge 14 of the connecting portion P3. Since the inner peripheral edge 14 of the connecting portion P3 is a straight line, in this embodiment, the third virtual straight line L3 is a straight line including the inner peripheral edge 14 of the connecting portion P3. The first portion P1, the second portion P2, and the connecting portion P3, which are drawn by each virtual straight line, are connected to each other. Therefore, the first virtual straight line L1, the second virtual straight line L2, and the third virtual straight line L3 intersect with each other.

[0030] Here, the angle on the central side of the main surface MF among the angles formed by the first virtual line L1 and the third virtual line L3 is defined as the first angle C1. The angle on the central side of the main surface MF among the angles formed by the second virtual line L2 and the third virtual line L3 is defined as the second angle C2. The angle on the central side of the main surface MF among the angles formed by the first virtual line L1 and the third virtual line L3 is defined as the third angle C3. At this time, the first angle C1 is larger than the third angle C3. Also, the second angle C2 is larger than the third angle C3. Preferably, the first angle C1 and the second angle C2 are 1.4 times or more larger than the third angle C3. Note that the "large angle" here means that the angle is significantly large, excluding manufacturing errors and the like. For example, if the first angle C1 is 5 degrees or more larger than the third angle C3, it can be said that the angle is significantly large. In this embodiment, the first angle C1 and the second angle C2 are about 135 degrees. The third angle C3 is approximately 90 degrees.

[0031] (Regarding the manufacturing method of the first embodiment) Next, a description will be given of a method for manufacturing the electronic component package 10. As shown in Fig. 3, the method for manufacturing the electronic component package 10 includes a preparation step S10 and a bonding step S11.

[0032] In the preparation step S10, as shown in FIG. 4, a first metal foil 11, a second metal foil 12, and an 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, or the like. In this state, the first metal foil 11 does not have a first bonding portion 11A. The second metal foil 12 does not have a second bonding portion 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 the first metal foil 11 and the second metal foil 12 face each other.

[0033] After the preparation step S10, the joining step S11 is performed. In the joining step S11, the first metal foil 11 and the second metal foil 12 are joined. Specifically, a laser is output to the main surface MF of the first metal foil 11 to melt and weld each metal foil. At this time, the laser is controlled so that the trajectory of the laser is an octagonal shape along the shape of the inner peripheral edge 14 of the joint 13 described above. As a result, the first metal foil 11 and the second metal foil 12 are melted into a quadrangular shape along the trajectory of the laser. At the same time, the melted surface of the first metal foil 11 and the melted 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 a 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 integrally formed. In addition, the shape of the inner peripheral edge 14 of the joint 13 becomes an octagonal shape by controlling the trajectory of the laser described above. In addition, the shape of the outer periphery 15 of the joint 13 is rectangular. By the above method, the electronic component package 10 is manufactured.

[0034] (Effects of the first embodiment) (1-1) In the above embodiment, the inner peripheral edge 14 of the first portion P1 and the inner peripheral edge 14 of the second portion P2 are connected via the inner peripheral edge 14 of the connecting portion P3. The first angle C1 and the second angle C2 are greater than the third angle C3. That is, the shape of the inner peripheral edge 14 of the joint portion 13 is gently curved compared to the case where the inner peripheral edge 14 of the first portion P1 and the inner peripheral edge 14 of the second portion P2 are directly connected. As a result, even if stress is generated in the inner peripheral edge 14 of the joint portion 13 due to the expansion of air in the sealed space of the electronic component package 10, for example, the stress acts in a dispersed manner on multiple bent portions. That is, the force is unlikely to concentrate on a specific portion of the inner peripheral edge 14 of the joint portion 13. Therefore, it is possible to suppress the first metal foil 11 and the second metal foil 12 from peeling off and the loss of the hermeticity of the sealed space.

[0035] (1-2) In the above embodiment, the first angle C1 and the second angle C2 are equal to or greater than 1.4 times the third angle C3. This makes it possible to disperse the stress acting on the inner periphery 14 of the joint 13 more significantly.

[0036] (1-3) Although the first angle C1 and the second angle C2 are larger than the third angle C3 as described above, when the electronic component package 100 is viewed as a whole, stress is still likely to concentrate on the inner peripheral edge 14 of the connecting portion P3. In this regard, in the above embodiment, the width dimension W of the connecting portion P3 is larger than the width dimensions W of the first portion P1 and the second portion P2. This increases the bonding strength of the first metal foil 11 and the second metal foil 12 at the connecting portion P3. By increasing the bonding strength of the connecting portion P3 in this manner, it is possible to significantly prevent the airtightness of the sealed space from being impaired.

[0037] <Second embodiment of electronic component package> 5, the electronic component package 100 of the second embodiment includes a plurality of unit packages. Specifically, the electronic component package 100 includes, as unit packages, a first unit package 110, a second unit package 120, and a third unit package 130. The configuration of each unit package is similar to the configuration of the electronic component package 10 of the first embodiment.

[0038] (Overall configuration of the second embodiment) The multiple unit packages are stacked in a direction perpendicular to the main surface MF. When viewed in a direction perpendicular to the main surface MF, the outer peripheral edges 15 of the multiple unit packages are aligned. The connection portions P3 of the multiple unit packages are joined to each other. Specifically, the first unit package 110, the second unit package 120, and the third unit package 130 are stacked in this order. The surfaces of the connection portions P3 of the first unit package 110 facing the second metal foil 12 and the surfaces of the connection portions P3 of the second unit package 120 facing the first metal foil 11 are joined to each other. The surfaces of the connection portions P3 of the second unit package 120 facing the second metal foil 12 and the surfaces of the connection portions P3 of the third unit package 130 facing the first metal foil 11 are joined to each other.

[0039] (Regarding the manufacturing method of the second embodiment) In the method for manufacturing electronic component package 100 in the second embodiment, first, each unit package is manufactured in the same manner as in the method for manufacturing electronic component package 10 in the first embodiment.

[0040] Next, the unit packages are stacked in a direction perpendicular to the main surface MF so that outer peripheries 15 of the joints 13 of the unit packages are aligned. Then, the connecting portions P3 of the unit packages are joined together. At this time, only the range of the connecting portion P3 that includes the portion where the outer periphery 15 is bent and does not reach the inner periphery 14 of the connecting portion P3 is joined by a laser. This makes it possible to manufacture an electronic component package 100 in which unit packages are stacked in a direction perpendicular to the main surface MF.

[0041] (Effects of the second embodiment) According to the second embodiment, in addition to the effects (1-1) to (1-3) of the first embodiment, the following effect is achieved.

[0042] (2-1) In the above embodiment, the connecting portions P3 of the unit packages are joined to each other. The width dimension W of each connecting portion P3 is larger than the width dimension W of the first portion P1 and the second portion P2, so that the area in which the connecting portions P3 can be joined to each other is large. This increases the joining strength between the unit packages.

[0043] (2-2) In the above embodiment, the multiple unit packages are stacked in a direction perpendicular to the main surface MF. Even in this embodiment, the bonded areas of the bonded portions 13 are large, so that the unit packages are less likely to shift or separate from each other.

[0044] (2-3) In the above embodiment, only the range of connecting portion P3 of the multiple unit packages that includes the portion where outer periphery 15 is bent and does not reach inner periphery 14 of connecting portion P3 is joined. In other words, the joining points that join the unit packages are away from the center of main surface MF. This makes it difficult for heat from welding to be transferred to electronic components EC stored in the sealed space during the manufacture of electronic component package 100.

[0045] <Example of change> The above embodiment can be modified as follows: The above embodiment and the following modifications can be combined with each other to the extent that no technical contradiction occurs.

[0046] 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 be iron, aluminum, copper, etc. The same applies to the second metal foil 12. In addition, the material of the first metal foil 11 and the material of the second metal foil 12 do not have to be the same.

[0047] 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 bonding portion 13 only needs to bond the outer edges of the three metal foils together.

[0048] 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. Furthermore, the shape of the inner peripheral edge 14 of the joint 13 does not have to be octagonal. For example, the inner peripheral edge 14 of the connecting portion P3 may be curved or polygonally bent. The more gently the bend of the inner peripheral edge 14 of the joint 13 is, the more the stress is dispersed in the bent portion. In other words, peeling of the first metal foil 11 and the second metal foil 12, which would cause a loss of the airtightness of the sealed space, can be more significantly prevented.

[0049] Regardless of the combination of the shape of the inner circumferential edge 14 and the shape of the outer circumferential edge 15, it is sufficient that the inner circumferential edge 14 has one straight portion and a portion connecting the straight portion and the portion connecting the straight portion and the portion connecting the straight portion and the portion connecting the straight portion. Furthermore, for these inner circumferential edges 14, it is sufficient that the first angle C1 and the second angle C2 are greater than the third angle C3, as in the above-described embodiment.

[0050] The first portion P1 does not have to be substantially rectangular. That is, the inner peripheral edge 14 of the first portion P1 does not have to be linear over the entire area, and may be partially curved. The same applies to the second portion P2. Even in such a case, when a first imaginary straight line L1 including a part of the inner peripheral edge 14 of the first portion P1 and a second imaginary straight line L2 including a part of the inner peripheral edge 14 of the second portion P2 are imaginary, it is sufficient that the first angle C1 and the second angle C2 are greater than the third angle C3.

[0051] Furthermore, even if the inner peripheral edge 14 of the connecting portion P3 is curved to be convex toward the center of the main surface MF, it is sufficient that the first angle C1, the second angle C2, and the third angle C3 have the above-mentioned relationship when a tangent including an arbitrary point on the inner peripheral edge 14 of the connecting portion P3 is defined as the third virtual straight line L3. In this case, if the above-mentioned angular relationship is satisfied for all points on the inner peripheral edge 14 of the connecting portion P3, the effect of (1) can be obtained.

[0052] The first portion P1 and the second portion P2 do not have to extend in directions perpendicular to each other. That is, the third angle C3 does not have to be approximately 90 degrees. The third angle C3 may be an acute angle or an obtuse angle.

[0053] The width dimension W of the joint 13 does not have to be maximum at the connecting portion P3. For example, the width dimension W may be substantially constant throughout the first portion P1, the second portion P2, and the connecting portion P3. The width dimension W may be maximum at a portion of the first portion P1. However, even in such a case, it is preferable that the maximum width dimension Wmax at the connecting portion P3 is larger than the width dimension W of the boundary portion between the connecting portion P3 and the first portion P1.

[0054] It is sufficient that the first angle C1 and the second angle C2 are greater than the third angle C3 for at least one connecting portion P3 and the first portion P1 and the second portion P2 connected to the connecting portion P3.

[0055] In the preparation step S10, it is not necessary to prepare two sheets of metal foil. For example, one sheet of metal foil may be folded and overlapped and joined. In this case, it is sufficient to join the three outer edges excluding the folded side.

[0056] In the bonding step S11, the method of forming the bonded portion 13 is not limited to the above embodiment. For example, the trajectory of the laser may be changed as appropriate according to the shape of the inner periphery 14 of the bonded portion 13 to be formed.

[0057] Also, for example, the laser movement speed may be slowed down toward the corners of the rectangular outer edge 15 of the joint 13 to be formed, thereby controlling the total amount of energy output to the corners to be increased.

[0058] Also, for example, the amount of energy output from the laser to the metal foil may be controlled to form a predetermined shape for the inner peripheral edge 14 of the joint 13. Specifically, when the laser is aimed at a corner of the rectangular outer peripheral edge 15 of the joint 13 to be formed in the joining step S11, the total amount of energy output from the laser may be more than twice as large as when the laser is aimed at a straight portion of the outer peripheral edge 15.

[0059] In electronic component package 100 of the second embodiment, the number of unit packages stacked in the direction perpendicular to main surface MF may be two, or may be four or more. In the electronic component package 100 of the second embodiment, the unit packages do not need to be the same size. It is sufficient that at least one connecting portion P3 of a unit package is joined to a connecting portion P3 of another unit package.

[0060] 6, in the electronic component package 100 of the second embodiment, a plurality of unit packages may be adjacent to each other in a direction along the main surface MF. In this case, the first unit package 110, the second unit package 120, the third unit package 130, and the fourth unit package 140 are arranged adjacent to each other in a direction along the main surface MF of each unit package. Specifically, these four unit packages are arranged in a matrix of two rows and two columns. A corner of the connecting portion P3 of the first unit package 110, a corner of the connecting portion P3 of the second unit package 120, a corner of the connecting portion P3 of the third unit package 130, and a corner of the connecting portion P3 of the fourth unit package 140 are joined to each other.

[0061] Even in such a case, since the width dimension W of the connecting portion P3 of each unit package is larger than the width dimensions W of the first portion P1 and the second portion P2, the joining area between the connecting portions P3 can be increased, thereby increasing the joining strength between the unit packages.

[0062] When multiple unit packages are adjacent to each other in the direction along the main surface MF, the number of unit packages may be at least two. Furthermore, the multiple unit packages do not have to be arranged in a matrix, and may be arranged, for example, in a row.

[0063] In the second embodiment, the method of joining the unit packages together is not limited to the example of the above embodiment. The entire connecting portions P3 of the unit packages may be joined together, or the first portions P1 may be joined together, or the second portions P2 may be joined together. Furthermore, joining is not limited to using a laser, and may be using ultrasonic joining or resistance welding. Furthermore, the unit packages may be joined together using an adhesive or the like (not shown).

[0064] <Additional Notes> The technical ideas that can be understood from the above-described embodiment and modified examples will be described. [1] A metal foil comprising a first metal foil, a second metal foil overlapping the first metal foil, and a joint portion in which an outer edge portion of the first metal foil and an outer edge portion of the second metal foil are joined, wherein when an edge of the joint portion that is located toward the center of a main surface of the first metal foil is defined as an inner peripheral edge, the joint portion comprises a first portion in which the inner peripheral edge is linear, a second portion in which the inner peripheral edge is linear and extends in a different direction from the first portion, and a connecting portion connecting an end of the first portion and an end of the second portion, wherein a first imaginary straight line including the inner peripheral edge of the first portion, an electronic component package in which, when a second imaginary line including the inner peripheral edges of the two portions and a third imaginary line that is a tangent to the inner peripheral edge of the connecting portion are imagined, an angle between the third imaginary line and the first imaginary line on the side of the center of the main surface is larger than an angle between the first imaginary line and the second imaginary line on the side of the center of the main surface, and an angle between the third imaginary line and the second imaginary line on the side of the center of the main surface is larger than an angle between the first imaginary line and the second imaginary line on the side of the center of the main surface.

[0065] [2] The package for electronic components according to [1], wherein the angle between the third virtual line and the first virtual line on the central side of the main surface is 1.4 times or more the angle between the first virtual line and the second virtual line on the central side of the main surface.

[0066] [3] The electronic component package according to [1] or [2], wherein the edge of the joint portion 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 portion is defined as the width dimension of the joint portion. The maximum width dimension of the connecting portion is larger than the maximum width dimension of the first portion.

[0067] [4] A plurality of unit packages each including a first metal foil, a second metal foil overlapping the first metal foil, and a joint portion in which an outer edge portion of the first metal foil and an outer edge portion of the second metal foil are joined, wherein when an edge of the joint portion of each of the unit packages that is located toward the center of a main surface of the first metal foil is defined as an inner peripheral edge, the joint portion includes a first portion in which the inner peripheral edge is linear, a second portion in which the inner peripheral edge is linear and extends in a direction different from that of the first portion, and a connecting portion connecting an end of the first portion and an end of the second portion, wherein when a first imaginary line including the inner peripheral edge of the first portion, a second imaginary line including the inner peripheral edge of the second portion, and a third imaginary line that is a tangent to the inner peripheral edge of the connecting portion are defined, an angle formed by the third imaginary line and the first imaginary line is 1 / 2. an electronic component package in which the connecting portions of a plurality of unit packages are joined to each other, the connecting portions being bonded to each other such that an angle of the connecting portions of the unit packages is greater than an angle of the connecting portions of the unit packages ...

[0068] [5] The electronic component package according to [4], wherein a plurality of the unit packages are stacked in a direction perpendicular to the main surface. [6] The electronic component package according to [4] or [5], wherein the unit packages are adjacent to each other in a direction along the main surface. [Explanation of symbols]

[0069] 10...Package for electronic components 11...First metal foil 12...Second metal foil MF: Main surface 13…Joint part P1…first part P2…Second part P3…Connection part W…Width dimension 14…Inner edge 15...Outer edge L1: First imaginary line L2: Second imaginary line L3: The third imaginary line 100...Package for electronic components 110…First unit package 120…2nd unit package 130…Third unit package 140…4th Unit Package

Claims

1. A first metal foil; a second metal foil overlapping the first metal foil; a joint portion at which an outer edge portion of the first metal foil and an outer edge portion of the second metal foil are joined; Equipped with When the edge of the joint portion located on the center side of the main surface of the first metal foil is defined as the inner peripheral edge, The joint is A first portion having a straight inner periphery; a second portion, the inner periphery of which is linear and extends in a direction different from that of the first portion; a connecting portion connecting an end of the first portion and an end of the second portion; Equipped with When a first virtual straight line including the inner peripheral edge of the first portion, a second virtual straight line including the inner peripheral edge of the second portion, and a third virtual straight line which is a tangent to the inner peripheral edge of the connecting portion are imagined, an angle on a central side of the main surface among an angle formed by the third virtual line and the first virtual line is larger than an angle on a central side of the main surface among an angle formed by the first virtual line and the second virtual line; Furthermore, an angle on a central side of the main surface among the angles formed by the third virtual line and the second virtual line is larger than an angle on a central side of the main surface among the angles formed by the first virtual line and the second virtual line. Package for electronic components.

2. Of the angles formed by the third virtual line and the first virtual line, an angle on a central side of the main surface is 1.4 times or more of an angle formed by the first virtual line and the second virtual line on the central side of the main surface.

2. The electronic component package of claim 1.

3. When an edge of the joint 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 an outer peripheral edge, and the shortest distance from any point on the outer peripheral edge to the inner peripheral edge of the joint portion is defined as a width dimension of the joint portion, The maximum width dimension of the connecting portion is greater than the maximum width dimension of the first portion.

2. The electronic component package of claim 1.

4. A first metal foil, a second metal foil overlapping the first metal foil, and a joint portion at which an outer edge portion of the first metal foil and an outer edge portion of the second metal foil are joined together; A plurality of unit packages each comprising When the edge of the joint portion of each of the unit packages that is located on the center side of the main surface of the first metal foil is defined as an inner peripheral edge, The joint is A first portion having a straight inner periphery; a second portion, the inner periphery of which is linear and extends in a direction different from that of the first portion; a connecting portion connecting an end of the first portion and an end of the second portion; Equipped with When a first virtual straight line including the inner peripheral edge of the first portion, a second virtual straight line including the inner peripheral edge of the second portion, and a third virtual straight line which is a tangent to the inner peripheral edge of the connecting portion are imagined, an angle on a central side of the main surface among an angle formed by the third virtual line and the first virtual line is larger than an angle on a central side of the main surface among an angle formed by the first virtual line and the second virtual line; and an angle between the third virtual line and the second virtual line on a central side of the main surface is larger than an angle between the first virtual line and the second virtual line on a central side of the main surface, When the edge of the joint portion of each of the unit packages 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 shortest distance from any point on the outer peripheral edge to the inner peripheral edge of the joint portion is defined as the width dimension of the joint portion, The maximum width dimension of the connecting portion is greater than the maximum width dimension of the first portion. The connecting portions of the plurality of unit packages are joined to each other. Package for electronic components.

5. The plurality of unit packages are stacked in a direction perpendicular to the main surface.

5. The electronic component package according to claim 4.

6. The plurality of unit packages are adjacent to each other in a direction along the main surface.

5. The electronic component package according to claim 4.

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