Package for electronic component
By designing multiple sections on the inner periphery of the joint of the package for electronic components and making them form a certain angle with the center side of the main surface, stress is dispersed, solving the problem of damaged sealing due to stress concentration in the closed space, and achieving higher sealing and stability.
Patent Information
- Application Number
- CN202422567538.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Priority Date
- 2023-11-13
- Filing Date
- 2024-10-23
- Publication Date
- 2025-09-09
- Estimated Expiration
- 2034-10-23
AI Technical Summary
When the air in the sealed space enclosed by conventional electronic components expands, stress concentration may occur on the inner periphery of the joint, causing the metal foil to peel off and impairing the sealing performance.
A package for electronic components is designed in which the inner periphery of a joint is composed of multiple sections, including a first section, a second section, and a connecting section. The first and second virtual straight lines are angled with the center of the main surface, with the connecting section having the largest width dimension to disperse stress.
By dispersing stress, the risk of stress concentration in specific areas is reduced, the sealing of the enclosed space is improved, and the metal foil is prevented from peeling off.
Smart Images
Figure CN223321258U_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 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 overlap so that their outer edges are aligned. In addition, the package for electronic components includes a joint formed by connecting the outer edge of the first metal foil and the outer edge of the second metal foil. The joint extends linearly along the edges of each metal foil. A closed space is separated by the first metal foil, the second metal foil, and the joint. Electronic components are stored in the closed space.
[0003] Patent Document 1: Japanese Patent No. 5377763
[0004] In the electronic component package disclosed in Patent Document 1, for example, the expansion of air within the enclosed space defined by the first and second metal foils may generate stress at the inner periphery of the joint. In this case, if the force is concentrated at a specific location within the inner periphery of the joint, there is a risk that the first and second metal foils may peel off, compromising the sealing properties of the enclosed space. Utility Model Content
[0005] In order to solve the above-mentioned problems, the utility model is a package for electronic components, which comprises: a first metal foil; a second metal foil overlapping with the first metal foil; and 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, 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 used as the inner peripheral edge, the joint portion comprises: a first portion, the inner peripheral edge is straight; a second portion, the inner peripheral edge is straight 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. When a first virtual straight line includes the above-mentioned inner periphery of a part, a second virtual straight line includes the above-mentioned inner periphery of the second part, and a third virtual straight line is a tangent to the above-mentioned inner periphery relative to the above-mentioned connecting part, the angle of the angle formed by the third virtual straight line and the first virtual straight line on the center side of the above-mentioned main surface is larger than the angle of the angle formed by the first virtual straight line and the second virtual straight line on the center side of the above-mentioned main surface, and the angle of the angle formed by the third virtual straight line and the second virtual straight line on the center side of the above-mentioned main surface is larger than the angle of the angle formed by the first virtual straight line and the second virtual straight line on the center side of the above-mentioned main surface.
[0006] Alternatively, the angle formed by the third virtual straight line and the first virtual straight line on the center side of the main surface may be 1.4 times or more the angle formed by the first virtual straight line and the second virtual straight line on the center side of the main surface.
[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 maximum width dimension at the above-mentioned connecting portion is larger than the maximum width dimension at the above-mentioned first portion.
[0008] In addition, the utility model is a package for electronic components, which has a plurality of unit packages, the unit packages comprising: a first metal foil; a second metal foil overlapping the first metal foil; and 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, and when the edge of the edge of the above-mentioned joint portion of each of the above-mentioned unit packages located on the center side of the main surface of the above-mentioned first metal foil is used as the inner peripheral edge, the above-mentioned joint portion comprises: a first part, the above-mentioned inner peripheral edge is a straight line; a second part, the above-mentioned inner peripheral edge is a straight line and extends in a direction different from that of the above-mentioned first part; and a connecting part connecting the end portion of the above-mentioned first part and the end portion of the above-mentioned second part, assuming a first virtual straight line including the above-mentioned inner peripheral edge of the above-mentioned first part, a second virtual straight line including the above-mentioned inner peripheral edge of the above-mentioned second part, and a third virtual straight line as a tangent to the above-mentioned inner peripheral edge of the above-mentioned connecting part. When the third virtual straight line and the first virtual straight line are straight lines, the angle of the angle formed by the third virtual straight line and the first virtual straight line on the center side of the above-mentioned main surface is larger than the angle of the angle formed by the first virtual straight line and the second virtual straight line on the center side of the above-mentioned main surface, and the angle of the angle formed by the third virtual straight line and the second virtual straight line on the center side of the above-mentioned main surface is larger than the angle of the angle formed by the first virtual straight line and the second virtual straight line on the center side of the above-mentioned main surface. When the edge of the edge of the above-mentioned joint part of each of the above-mentioned unit packages is located on the opposite side of the center of the above-mentioned main surface compared to the above-mentioned inner periphery 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 part is taken as the width dimension of the above-mentioned joint part, the maximum width dimension at the above-mentioned connecting part is larger than the maximum width dimension at the above-mentioned first part, and the above-mentioned connecting parts of multiple above-mentioned unit packages are connected to each other.
[0009] A plurality of the unit packages may be stacked in a direction perpendicular to the main surface.
[0010] A plurality of the unit packages may be adjacent to each other in a direction along the main surface.
[0011] The stress generated at the inner periphery of the joint is easily dispersed. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a perspective view of the electronic component package according to the first embodiment.
[0013] Figure 2 This is a partially enlarged view of the electronic component package according to the first embodiment.
[0014] Figure 3 This is a flowchart of the method for manufacturing the electronic component package according to the first embodiment.
[0015] Figure 4 It is an explanatory diagram of the manufacturing method of the electronic component package of the first embodiment.
[0016] Figure 5 It is a perspective view of an electronic component package according to a second embodiment.
[0017] Figure 6 It is a perspective view of an electronic component package according to a modified example.
[0018] Description of Reference Numerals
[0019] 10…Package for electronic components; 11…First metal foil; 12…Second metal foil; MF…Main surface; 13…Joint portion; P1…First portion; P2…Second portion; P3…Connecting portion; W…Width dimension; 14…Inner periphery; 15…Outer periphery; L1…First virtual straight line; L2…Second virtual straight line; L3…Third virtual straight line; 100…Package for electronic components; 110…First unit package; 120…Second unit package; 130…Third unit package; 140…Fourth unit package. DETAILED DESCRIPTION
[0020] The following describes the first and second embodiments of the electronic component package. 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 ones.
[0021] <First embodiment of electronic component package>
[0022] (Regarding the Overall Structure of the First Embodiment)
[0023] like Figure 1 As shown, the electronic component package 10 includes a first metal foil 11 and a second metal foil 12 .
[0024] 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.
[0025] The first metal foil 11 has a first bonding portion 11A and a first non-bonding portion 11B. The first bonding portion 11A is the 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 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 edge of the first bonding portion 11A that is 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 an octagon. The outer peripheral edge 15 is consistent with the outer edge of the first metal foil 11. Therefore, the shape of the outer peripheral edge 15 is a quadrilateral.
[0026] 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 an octagonal planar shape. Furthermore, the first non-joined portion 11B can be separated 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.
[0027] like Figure 1 As shown, the second metal foil 12 is a foil having a roughly square shape. 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 a roughly square ring. 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 an octagon. In addition, the shape of the outer periphery 15 of the second bonding portion 12A is a quadrilateral.
[0028] 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 peripheral edge 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.
[0029] According to the above configuration, the electronic component package 10 has a closed space partitioned by the first metal foil 11 and the second metal foil 12. Although not shown in the figure, the electronic component package 10 stores a predetermined electronic component EC in the closed space.
[0030] Furthermore, the first metal foil 11 and the second metal foil 12 are welded in the joining process S11 described later. Therefore, the first joining portion 11A is the portion formed by melting the first metal foil 11. The second joining portion 12A is the portion formed by melting the second metal foil 12. Furthermore, the first joining portion 11A and the second joining portion 12A are an integral body joined together. Therefore, sometimes a clear boundary between the first joining portion 11A and the second joining portion 12A cannot be observed.
[0031] Hereinafter, the integrated structure of the first and second joining portions 11A, 12A will be referred to as the joining portion 13. Furthermore, the inner periphery 14 of the first and second joining portions 11A, 12A will be described as the inner periphery 14 of the joining portion 13. Similarly, the outer periphery 15 of the first and second joining portions 11A, 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 and second metal foils 11, 12.
[0032] (Regarding the shape of the joint)
[0033] 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, the shapes of the first bonding portion 11A and the second bonding portion 12A will be described below as the shape of the bonding portion 13.
[0034] like Figure 1 As shown, the joint 13 includes a pair of first parts P1, a pair of second parts P2, and four connecting parts P3. The first part P1 is a part that extends along any side of the first metal foil 11 when viewed from above. At the first part P1, the inner periphery 14 and the outer periphery 15 extend roughly parallel to each other. Therefore, the first part P1 is an elongated rectangle when viewed from above. Here, the shortest distance from any point on the outer periphery 15 to the inner periphery 14 is taken as the width dimension W of the joint 13. As described above, the inner periphery 14 and the outer periphery 15 of the first part P1 are parallel to each other, so the width dimension W of the first part P1 is roughly the same throughout the first part P1.
[0035] 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.
[0036] The second portion P2 extends along the side of the first metal foil 11 when viewed from above, where the first portion P1 is not located. In other words, the second portion P2 extends in a different direction from the first portion P1. In the second portion P2, the inner periphery 14 and the outer periphery 15 extend approximately parallel to each other. Therefore, the second portion P2 is an elongated rectangle when viewed from above. As described above, the inner periphery 14 and the outer periphery 15 of the second portion P2 are parallel, so the width dimension W of the second portion P2 is approximately constant throughout the entire second portion P2. Furthermore, the width dimension W of the second portion P2 is approximately equal to the width dimension W of the first portion P1.
[0037] The pair of second portions P2 extend substantially parallel to each other when viewed from above along the first metal foil 11 and are not provided on the two sides of the first portion P1. 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.
[0038] The inner and outer peripheries 14 and 15 of the first portion P1 extend in directions different from those of the second portion P2, reflecting the aforementioned arrangement of the first and second portions P1 and P2. Specifically, the first and second portions P1 and P2 extend in substantially orthogonal directions.
[0039] 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 has a pentagonal shape that includes the corners of joint 13 when viewed from above.
[0040] On the one hand, the four connecting portions P3 are located at the four overlapping corners of each metal foil. The inner periphery 14 of the connecting portion P3 is a straight line. On the other hand, the outer periphery 15 of the connecting portion P3 reflects the shape of the corners of each metal foil, with two straight lines connected at a right angle.
[0041] Furthermore, the width W at the connection portion P3 is greater than the width W of the first portion P1 and the width W of the second portion P2. Furthermore, the width W of the joint 13 is at its maximum within the connection portion P3. More specifically, the maximum width Wmax of the joint 13 is the shortest distance from the substantially perpendicular vertex of the joint 13 to a point on the inner peripheral edge 14 when viewed from above.
[0042] (Regarding the inner periphery of the joint)
[0043] like Figure 2As shown in FIG. 1 , 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 periphery 14 of the joint 13. 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.
[0044] 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 third virtual straight line L3 is a tangent line to the inner periphery 14 of the connecting portion P3. Since the inner periphery 14 of the connecting portion P3 is a straight line, in this embodiment, the third virtual straight line L3 is a straight line that includes the inner periphery 14 of the connecting portion P3. The first portion P1, second portion P2, and connecting portion P3, which are drawn as virtual straight lines, 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 each other.
[0045] Here, the angle between the first virtual straight line L1 and the third virtual straight line L3, which is closer to the center of the main surface MF, is referred to as the first angle C1. The angle between the second virtual straight line L2 and the third virtual straight line L3, which is closer to the center of the main surface MF, is referred to as the second angle C2. The angle between the first virtual straight line L1 and the third virtual straight line L3, which is closer to the center of the main surface MF, is referred to as the third angle C3. In this case, the first angle C1 is greater than the third angle C3. Furthermore, the second angle C2 is greater than the third angle C3. Preferably, the first angle C1 and the second angle C2 are at least 1.4 times the third angle C3. Furthermore, the term "large angle" here means that the angle is intentionally large to eliminate manufacturing errors. For example, if the first angle C1 is at least 5 degrees greater than the third angle C3, the angle can be considered intentionally large. In this embodiment, the first angle C1 and the second angle C2 are approximately 135 degrees. The third angle C3 is approximately 90 degrees.
[0046] (Regarding the Manufacturing Method of the First Embodiment)
[0047] 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 .
[0048] In the preparation step S10, Figure 4As 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.
[0049] 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, by outputting a laser to the main surface MF of the first metal foil 11, the melting and welding of each metal foil are performed. At this time, the laser is controlled so that the trajectory of the laser becomes an octagon along the shape of the inner peripheral edge 14 of the above-mentioned joint 13. 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 melting surface of the first metal foil 11 and the melting 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. In addition, by controlling the trajectory of the laser, the shape of the inner peripheral edge 14 of the joint 13 becomes an octagon. Furthermore, the outer peripheral edge 15 of the bonding portion 13 has a quadrilateral shape. By the above method, the electronic component package 10 is manufactured.
[0050] (Effects of the First Embodiment)
[0051] (1-1) In the above embodiment, the inner periphery 14 of the first portion P1 and the inner periphery 14 of the second portion P2 are connected via the inner periphery 14 of the connecting portion P3. Moreover, the first angle C1 and the second angle C2 are larger than the third angle C3. That is, compared with the case where the inner periphery 14 of the first portion P1 and the inner periphery 14 of the second portion P2 are directly connected, the shape of the inner periphery 14 of the joint 13 is gently bent. Thus, even if stress is generated in the inner periphery 14 of the joint 13 due to expansion of air in the closed space of the electronic component package 10, the stress is dispersed and acts on multiple bent portions. That is, force is not easily concentrated on a specific portion of the inner periphery 14 of the joint 13. Therefore, it is possible to prevent the first metal foil 11 and the second metal foil 12 from peeling off and damaging the sealing of the closed space.
[0052] (1-2) In the above embodiment, the first angle C1 and the second angle C2 are 1.4 times or more the third angle C3. This makes it possible to more significantly disperse the stress applied to the inner peripheral edge 14 of the joint 13.
[0053] (1-3) Although the first angle C1 and the second angle C2 are greater than the third angle C3 as described above, stress is still likely to concentrate on the inner peripheral edge 14 of the connection portion P3 when viewing the electronic component package 100 as a whole. To address this issue, in the above-described embodiment, the width W of the connection portion P3 is larger than the widths W of the first portion P1 and the second portion P2. This improves the bond strength between the first metal foil 11 and the second metal foil 12 at the connection portion P3. By increasing the bond strength at the connection portion P3 in this manner, it is possible to significantly prevent the sealing of the enclosed space from being compromised.
[0054] <Second embodiment of electronic component package>
[0055] like Figure 5 As shown, the electronic component package 100 of the second embodiment includes a plurality of unit packages. Specifically, the electronic component package 100 includes a first unit package 110, a second unit package 120, and a third unit package 130. The structure of each unit package is the same as that of the electronic component package 10 of the first embodiment.
[0056] (Regarding the Overall Structure of the Second Embodiment)
[0057] Multiple unit packages are stacked in a direction perpendicular to the main surface MF. Furthermore, when viewed in a direction perpendicular to the main surface MF, the outer peripheries 15 of each unit package are aligned. Furthermore, the connection portions P3 of the multiple unit packages are bonded to one another. Specifically, the first unit package 110, the second unit package 120, and the third unit package 130 are stacked in sequence. Furthermore, the surface of each connection portion P3 of the first unit package 110 on the side of the second metal foil 12 and the surface of each connection portion P3 of the second unit package 120 on the side of the first metal foil 11 are bonded to one another. The surface of each connection portion P3 of the second unit package 120 on the side of the second metal foil 12 and the surface of each connection portion P3 of the third unit package 130 on the side of the first metal foil 11 are bonded to one another.
[0058] (Regarding the Manufacturing Method of the Second Embodiment)
[0059] In the method for manufacturing the electronic component package 100 in the second embodiment, first, each unit package is manufactured by the same method as the method for manufacturing the electronic component package 10 in the first embodiment.
[0060] Next, the unit packages are stacked in a direction perpendicular to the main surface MF so that the outer peripheries 15 of the joints 13 of the unit packages are aligned. The connecting portions P3 of the unit packages are then joined together. At this point, the laser is used to join only the portion of connecting portion P3 that includes the bent outer periphery 15 and does not reach the inner periphery 14 of connecting portion P3. This allows the manufacture of an electronic component package 100 in which the unit packages are stacked in a direction perpendicular to the main surface MF.
[0061] (Effects of the Second Embodiment)
[0062] According to the second embodiment, in addition to the effects (1-1) to (1-3) of the above-mentioned first embodiment, the following effects are also achieved.
[0063] (2-1) In the above embodiment, the connecting portions P3 of the unit packages are joined together. The width W of each connecting portion P3 is larger than the width W of the first portion P1 and the second portion P2. This increases the area over which the connecting portions P3 can be joined. This improves the joint strength between the unit packages.
[0064] (2-2) In the above embodiment, a plurality of unit packages are stacked in a direction perpendicular to the main surface MF. Even in such a configuration, the bonding area of the bonding portions 13 is large, and the unit packages are less likely to shift or separate.
[0065] (2-3) In the above embodiment, the connection portions P3 of the plurality of unit packages are joined only to the portion that includes the bent outer periphery 15 and does not reach the inner periphery 14 of the connection portion P3. In other words, the joining point between the unit packages is located away from the center of the main surface MF. As a result, during the manufacture of the electronic component package 100, heat generated by soldering is less likely to be transferred to the electronic component EC stored in the enclosed space.
[0066] <Change Example>
[0067] 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.
[0068] 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.
[0069] 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.
[0070] Alternatively, when viewed in a direction perpendicular to the main surface MF, the outer periphery 15 of the joint 13 may not be a quadrilateral. Furthermore, the inner periphery 14 of the joint 13 may not be an octagon. For example, the inner periphery 14 of the connecting portion P3 may be bent into a curved or polygonal shape. The smoother the bend of the inner periphery 14 of the joint 13, the more the stress is dispersed in the bent portion. In other words, it is possible to more significantly suppress the first metal foil 11 and the second metal foil 12 from peeling off, thereby compromising the sealing of the enclosed space.
[0071] Regardless of the combination of the shapes of the inner peripheral edge 14 and the outer peripheral edge 15, the inner peripheral edge 14 only needs to have a straight portion and a portion connecting them. Furthermore, as with the above-described embodiment, the inner peripheral edge 14 only needs to have a relationship where the first angle C1 and the second angle C2 are greater than the third angle C3.
[0072] The first portion P1 need not be substantially rectangular. That is, the inner periphery 14 of the first portion P1 need not be entirely straight, but may be partially curved. This also applies to the second portion P2. Even in this case, when assuming a first virtual straight line L1 encompassing a portion of the inner periphery 14 of the first portion P1 and a second virtual straight line L2 encompassing a portion of the inner periphery 14 of the second portion P2, the first angle C1 and the second angle C2 need only be greater than the third angle C3.
[0073] Furthermore, even if, for example, the inner peripheral edge 14 of the connecting portion P3 is bent into a curved shape that bulges toward the center of the main surface MF, the first angle C1, the second angle C2, and the third angle C3 may have the aforementioned relationship, provided that a tangent line at any 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 aforementioned angular relationship is satisfied for all points on the inner peripheral edge 14 of the connecting portion P3, the effect (1) can be achieved.
[0074] The first portion P1 and the second portion P2 may not extend in directions perpendicular to each other. In other words, the third angle C3 may not be approximately 90 degrees. The third angle C3 may be an acute angle or an obtuse angle.
[0075] The width W of the joint 13 may not be greatest at the connection portion P3. For example, the width W may be substantially constant throughout the first portion P1, the second portion P2, and the connection portion P3. Alternatively, the width W may be greatest locally at the first portion P1. However, even in such cases, it is preferred that the maximum width Wmax at the connection portion P3 be greater than the width W at the boundary between the connection portion P3 and the first portion P1.
[0076] Regarding at least 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 first angle C1 and the second angle C2 are larger than the third angle C3 .
[0077] In the preparation step S10 , two metal foils may not be prepared. For example, a single metal foil may be folded and overlapped to form a bond. In this case, only the three outer edges excluding the folded-back sides need to be bonded.
[0078] In the joining step S11 , the method for forming the joint portion 13 is not limited to the example of the above embodiment. For example, the trajectory of the laser beam may be appropriately changed to suit the shape of the inner peripheral edge 14 of the joint portion 13 to be formed.
[0079] Furthermore, for example, the laser beam may be controlled so as to slow down the moving speed of the laser beam at the corners of the quadrilateral outer periphery 15 of the bonded portion 13 to be formed, thereby increasing the total amount of energy output to the corners.
[0080] Alternatively, for example, the amount of energy output from the laser to the metal foil may be controlled to achieve a predetermined shape of the inner peripheral edge 14 of the joint 13. Specifically, in the joining step S11, the total amount of energy output from the laser may be doubled when the laser aiming point is located at a corner of the quadrilateral outer peripheral edge 15 of the joint 13 to be formed, compared to when the laser aiming point is located at a straight portion of the outer peripheral edge 15.
[0081] In the electronic component package 100 according to the second embodiment, the number of unit packages stacked in the direction perpendicular to the main surface MF may be two, or may be four or more.
[0082] In the electronic component package 100 of the second embodiment, the sizes of the unit packages may be different. At least one connecting portion P3 of a unit package may be joined to a connecting portion P3 of another unit package.
[0083] ·like Figure 6As shown, in the electronic component package 100 of the second embodiment, multiple unit packages may be adjacent to each other 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 along the main surface MF of each unit package. Specifically, the four unit packages are arranged in a matrix of two rows and two columns. Furthermore, the corner portions of the connecting portion P3 of the first unit package 110, the corner portions of the connecting portion P3 of the second unit package 120, the corner portions of the connecting portion P3 of the third unit package 130, and the corner portions of the connecting portion P3 of the fourth unit package 140 are joined to each other.
[0084] In this case, the width W of the connecting portion P3 of each unit package is larger than the width W of the first portion P1 and the second portion P2, thereby increasing the bonding area between the connecting portions P3 and improving the bonding strength between the unit packages.
[0085] When a plurality of unit packages are adjacent to each other in the direction along the main surface MF, the number of unit packages may be two or more. In addition, the plurality of unit packages may not be arranged in rows and columns, but may be arranged in a single row, for example.
[0086] In the second embodiment, the method for joining the unit packages is not limited to that described in the above embodiment. The entire connecting portion P3 of each unit package may be joined, or the first portions P1 and the second portions P2 may be joined. Furthermore, joining is not limited to laser bonding; ultrasonic bonding or resistance welding may also be employed. Furthermore, the unit packages may be joined using adhesives (not shown).
[0087] Notes
[0088] Technical ideas that can be grasped from the above-mentioned embodiments and modifications are described.
[0089] [1] A package for an electronic component, comprising:
[0090] a first metal foil;
[0091] a second metal foil overlapping the first metal foil; and
[0092] The joint portion is formed by joining the outer edge portion of the first metal foil and the outer edge portion of the second metal foil.
[0093] 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,
[0094] The above-mentioned joint part has:
[0095] In the first part, the aforementioned inner periphery is a straight line;
[0096] The second portion has a linear inner periphery and extends in a direction different from that of the first portion; and
[0097] a connecting portion connecting the end of the first portion and the end of the second portion,
[0098] Assuming 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 being a tangent to the inner peripheral edge of the connecting portion,
[0099] The angle formed by the third virtual straight line and the first virtual straight line, which is closer to the center of the main surface, is larger than the angle formed by the first virtual straight line and the second virtual straight line, which is closer to the center of the main surface, and
[0100] The angle formed by the third virtual straight line and the second virtual straight line, which is closer to the center of the main surface, is larger than the angle formed by the first virtual straight line and the second virtual straight line, which is closer to the center of the main surface.
[0101] [2] The electronic component package according to [1], wherein:
[0102] The angle formed by the third virtual straight line and the first virtual straight line on the center side of the main surface is 1.4 times or more the angle formed by the first virtual straight line and the second virtual straight line on the center side of the main surface.
[0103] [3] The electronic component package according to [1] or [2], wherein:
[0104] When the edge of 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 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 junction portion is defined as the width dimension of the junction portion,
[0105] The maximum width dimension at the connecting portion is larger than the maximum width dimension at the first portion.
[0106] [4] A package for an electronic component, wherein:
[0107] A plurality of unit packages are provided, each of which comprises: a first metal foil; a second metal foil overlapping the first metal foil; and a joint formed by joining the outer edge of the first metal foil and the outer edge of the second metal foil.
[0108] When the edge of the bonding portion of each unit package located on the center side of the main surface of the first metal foil is defined as the inner peripheral edge,
[0109] The joint has:
[0110] In the first part, the aforementioned inner periphery is a straight line;
[0111] The second portion has a linear inner periphery and extends in a direction different from that of the first portion; and
[0112] a connecting portion connecting the end of the first portion and the end of the second portion,
[0113] Assuming 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 being a tangent to the inner peripheral edge of the connecting portion,
[0114] The angle formed by the third virtual straight line and the first virtual straight line, which is closer to the center of the main surface, is larger than the angle formed by the first virtual straight line and the second virtual straight line, which is closer to the center of the main surface, and
[0115] The angle formed by the third virtual straight line and the second virtual straight line, which is closer to the center of the main surface, is larger than the angle formed by the first virtual straight line and the second virtual straight line, which is closer to the center of the main surface.
[0116] When the edge of the edge of the bonding portion of each unit package located on the opposite side of the center of the main surface relative 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 bonding portion is defined as the width dimension of the bonding portion,
[0117] The maximum width dimension at the connecting portion is larger than the maximum width dimension at the first portion.
[0118] The connection portions of the plurality of unit packages are joined to each other.
[0119] [5] The electronic component package according to [4], wherein:
[0120] The plurality of unit packages are stacked in a direction perpendicular to the main surface.
[0121] [6] The electronic component package according to [4] or [5], wherein:
[0122] The plurality of unit packages are adjacent to each other in a direction along the main surface.
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 joint portion is formed by joining the outer edge portion of the first metal foil and the outer edge portion of the second metal foil, 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, Assuming 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 being a tangent to the inner peripheral edge of the connecting portion, The angle formed by the third virtual straight line and the first virtual straight line, which is closer to the center of the main surface, is larger than the angle formed by the first virtual straight line and the second virtual straight line, which is closer to the center of the main surface. The angle formed by the third virtual straight line and the second virtual straight line on the center side of the main surface is larger than the angle formed by the first virtual straight line and the second virtual straight line on the center side of the main surface.
2. The electronic component package according to claim 1, wherein The angle formed by the third virtual straight line and the first virtual straight line on the center side of the main surface is 1.4 times or more the angle formed by the first virtual straight line and the second virtual straight line on the center side of the main surface.
3. The electronic component package according to claim 1, 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 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 joint portion is taken as the width dimension of the joint portion, The maximum width dimension at the connecting portion is greater than the maximum width dimension at the first portion.
4. A package for electronic components, characterized in that A plurality of unit packages are provided, each unit package comprising: a first metal foil; a second metal foil overlapping the first metal foil; and a joint formed by joining an outer edge portion of the first metal foil and an outer edge portion of the second metal foil. When the edge of the joining portion of each unit package 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, Assuming 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 being a tangent to the inner peripheral edge of the connecting portion, The angle formed by the third virtual straight line and the first virtual straight line, which is closer to the center of the main surface, is larger than the angle formed by the first virtual straight line and the second virtual straight line, which is closer to the center of the main surface. The angle formed by the third virtual straight line and the second virtual straight line on the center side of the main surface is larger than the angle formed by the first virtual straight line and the second virtual straight line on the center side of the main surface. When the edge of the bonding portion of each unit package located on the opposite side of the center of the main surface relative to the inner periphery is defined as the outer periphery, and the shortest distance from any point on the outer periphery to the inner periphery of the bonding portion is defined as the width dimension of the bonding portion, The maximum width dimension at the connecting portion is larger than the maximum width dimension at the first portion, The connecting portions of the plurality of unit packages are joined to each other.
5. The electronic component package according to claim 4, wherein The plurality of unit packages are stacked in a direction perpendicular to the main surface.
6. The electronic component package according to claim 4, wherein The plurality of unit packages are adjacent to each other in a direction along the main surface.