JP2012209408A - Manufacturing method of electronic component and wiring board - Google Patents

Abstract

An electronic component manufacturing method and a wiring board are provided which can form a solder layer thinly.
A step of providing a plurality of solder portions 20 on lands 12 and 16 provided on a substrate 1 and disposing the element 50 so that the plurality of solder portions 20 and electrodes 51 and 52 of the element 50 are in contact with each other. And a step of heating and melting the plurality of solder portions 20 to form a solder layer, and connecting the electrodes 51 and 52 and the lands 12 and 16 through the solder layer. When the electrodes 51 and 52 of the element 50 are connected to the lands 12 and 16, the plurality of solder portions 20 are melted, and a part of the molten solder is provided between the plurality of solder portions (that is, a solder portion is provided). The solder layer spreads out into a single solder layer. Thereby, the solder left between the electrodes 51 and 52 of the element 50 and the lands 12 and 16 can be reduced.
[Selection] Figure 3

Description

  The present invention relates to an electronic component manufacturing method and a wiring board.

20A to 20C are plan views showing a method of manufacturing an electronic component according to a conventional example.
As shown in FIG. 20A, first, a wiring board 110 is prepared. The wiring substrate 110 includes a base substrate 101, a first wiring 111 provided on the surface 101 a of the base substrate 101, and a second wiring 115. A first land 112 is provided at the tip of the first wiring 111, and a second land 116 is provided at the tip of the second wiring 115. The first land 112 and the second land 116 are adjacent to each other in a separated state, for example, in the X-axis direction in plan view.

  Next, as shown in FIG. 20B, cream solder is applied to the first land 112 and the second land 116 of the wiring board 110 to form solder portions 120. Then, as shown in FIG. 20C, an element 150 having a first electrode 151 and a second electrode 152 is prepared, the first electrode 151 is overlaid on the first land 112, and the second land A second electrode 152 is overlaid on 116 and passed through a reflow furnace in this state. As a result, the solder portion 120 is melted to become a solder layer 120 ′, the first electrode 151 is connected to the first land 112 via the solder layer 120 ′, and the second electrode 152 is connected to the second land 120 ′. 116. Note that such a mounting form is also disclosed in FIG. 1 of Patent Document 1, for example.

JP 2005-136375 A

By the way, the electronic component shown in FIG. 20C is mounted on various electronic devices such as a mobile phone and electronic paper. These electronic devices are desired to be thin from the viewpoint of portability and the like, and as part of this, it is desired to reduce the height of electronic components mounted on the electronic devices. In response, the wiring board 110 and the element 150 are becoming smaller and thinner.
However, the solder layer 120 ′ between the wiring substrate 110 and the element 150 has a problem that it is difficult to form the solder layer 120 ′ thin. For example, the solder layer 120 ′ is formed by applying cream solder and reflowing it, but the cream solder tends to be applied thicker. For this reason, it has been difficult to further reduce the height of electronic components.
Accordingly, some aspects of the present invention have been made in view of such circumstances, and an object thereof is to provide a method for manufacturing an electronic component and a wiring board capable of forming a solder layer thinly. One of them.

  In order to achieve the above object, a method of manufacturing an electronic component according to an aspect of the present invention includes a step of providing a plurality of solder portions on a land provided on a substrate, and the plurality of solder portions and an electrode of an element are in contact with each other And a step of heating and melting the plurality of solder portions to form a solder layer and connecting the electrode and the land via the solder layer. And Here, examples of the “element” include elements such as a capacitor and a resistance element.

  With such a method, when connecting the electrode and the land of the element, the plurality of solder portions are melted, and a part of the melted solder (that is, molten solder) is an area between the plurality of solder portions ( That is, it wets and spreads over a region where no solder portion is provided, and forms a single solder layer. Thereby, the solder left between the electrode of an element and a land can be decreased, and a solder layer can be formed thinly. By forming the solder layer thin, the distance between the electrode of the element and the land can be shortened, so that the height of the electronic component can be reduced. The “substrate” in the present invention corresponds to, for example, the base substrate 1 described later.

  In the electronic component manufacturing method, an opening is provided in a region of the land that overlaps the electrode. In the step of connecting the electrode and the land, the plurality of solder portions are melted. It is good also as making a part enter the said opening part. With such a method, it is possible to further reduce the solder left between the electrode of the element and the land.

  Further, in the above electronic component manufacturing method, the land is provided with a plurality of openings as the openings, and the shape of each of the plurality of openings is a first shape, When the shape of each of the plurality of solder portions in plan view is the second shape, the first shape and the second shape are similar, and the second shape is more than the first shape. In the step of providing the plurality of solder portions, each of the plurality of openings may be covered with each of the plurality of solder portions. With such a method, the solder can easily enter the opening. Also, since the shape of the solder portion (second shape) is larger than the shape of the opening portion (first shape), it is easy to leave the solder necessary for connection between the electrode of the element and the land. it can.

  In the electronic component manufacturing method described above, in the step of providing the plurality of solder portions, each of the plurality of solder portions is formed in the same shape and the same size in a plan view, and is arranged at equal intervals. May be a feature. With such a method, the molten solder escape path (that is, a wet spreading path) is uniformly ensured on the land, so that it is easy to make the thickness of the solder layer uniform.

  The method of manufacturing an electronic component according to another aspect of the present invention includes a step of providing a solder part on a land provided on a substrate, a step of arranging the element so that the solder part and an electrode of the element are in contact with each other, Heating and melting the solder part to form a solder layer, and connecting the electrode and the land via the solder layer, the land having an opening, and the electrode In the step of connecting to the land, a melted part of the solder portion is allowed to enter the opening. With such a method, when the element electrode and the land are connected, the amount of solder left between the element electrode and the land can be reduced, and the solder layer can be formed thin. Thereby, since the distance between the electrode of an element and a land can be shortened, the height reduction of an electronic component is realizable.

  A wiring board according to still another aspect of the present invention is a wiring board to which an element having an electrode is attached, and is provided in a substrate, a land provided on the board, and a planned area overlapping with the electrode of the land. And a plurality of solder portions. With such a configuration, when the electrode is connected to the land, a part of the molten solder wets and spreads in a region between the plurality of solder portions (that is, a region where the solder portion is not provided). One solder layer. Thereby, the solder left between an electrode and a land can be decreased and a solder layer can be formed thinly. Since the distance between the electrode of the element and the land can be shortened, it is possible to reduce the height of the electronic component.

  Further, in the above wiring board, an opening is provided in a region that overlaps the electrode of the land, and at least a part of the opening and the plurality of solder portions overlap in plan view. May be a feature. If it is such a structure, when connecting an electrode and a land, the melted part of a several solder part will enter in an opening part. For this reason, it is possible to further reduce the amount of solder left between the electrode of the element and the land, and to form a thinner solder layer.

  A wiring board according to still another aspect of the present invention is a wiring board to which an element having an electrode is attached, the board including a land provided on the board, and a planned area overlapping the electrode of the land. Is provided with an opening. If it is such a structure, when connecting an electrode and a land, the melted part of a several solder part will enter in an opening part. For this reason, the solder left between the electrode of an element and a land can be decreased, and a solder layer can be formed thinly. Thereby, since the distance between the electrode of an element and a land can be shortened, the height reduction of an electronic component is realizable.

The figure which shows the manufacturing method of the electronic component which concerns on 1st Embodiment (the 1). The figure which shows the manufacturing method of the electronic component which concerns on 1st Embodiment (the 2). The figure which shows the manufacturing method of the electronic component which concerns on 1st Embodiment (the 3). The figure which shows typically the formation process of solder layer 20 '. The figure which shows the other example of the planar shape of the solder part 20 (the 1). The figure which shows the other example of the planar shape of the solder part 20 (the 2). The figure which shows the other example of the planar shape of the solder part 20 (the 3). The figure which shows the other example of the planar shape of the solder part 20 (the 4). The figure which shows the manufacturing method of the electronic component which concerns on 2nd Embodiment (the 1). The figure which shows the manufacturing method of the electronic component which concerns on 2nd Embodiment (the 2). The figure which shows the manufacturing method of the electronic component which concerns on 2nd Embodiment (the 3). The figure which shows typically the formation process of solder layer 70 '. The figure which shows the other example of the planar shape of the opening part 63 (the 1). The figure which shows the other example of the planar shape of the opening part 63 (the 2). The figure which shows the other example of the planar shape of the opening part 63 (the 3). The figure which shows the other example of the planar shape of the opening part 63 (the 4). The figure which shows the structural example of the wiring board 80 which concerns on 3rd Embodiment. The figure which shows the other example of the wiring board 80 (the 1). The figure which shows the other example of the wiring board 80 (the 2). The figure which shows the manufacturing method of the electronic component which concerns on a prior art example.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that, in each drawing described below, parts having the same configuration are denoted by the same reference numerals, and redundant description thereof is omitted.
(1) First Embodiment FIGS. 1A to 3B are views showing a method of manufacturing an electronic component according to a first embodiment of the present invention. FIG. 1A is a plan view, and FIG. (B) of a figure is sectional drawing which cut | disconnected (a) by the X1-X'1 line | wire-X3-X'3 line | wire.
As shown in FIGS. 1A and 1B, first, a wiring board 10 is prepared. The wiring substrate 10 includes a base substrate 1, a first wiring 11 provided on the surface 1 a of the base substrate 1, and a second wiring 15. A first land 12 is provided at the tip of the first wiring 11, and a second land 16 is provided at the tip of the second wiring 15.

  The base substrate 1 is made of, for example, a flexible insulating film, and is made of, for example, polyimide. Further, the first wiring 11 including the first land 12 and the second wiring 15 including the second land 16 are each made of metal (for example, copper foil), and the surface thereof is plated. Good. For example, when the metal constituting the first wiring 11 and the second wiring 15 is copper (Cu), the surface thereof may be plated with gold (Au) or tin (Sn).

  As shown in FIG. 1A, the first land 12 and the second land 16 have the same shape (for example, a rectangle) and the same size in plan view. The first land 12 and the second land 16 are adjacent to each other, for example, in a state separated in the lateral direction in plan view. In each description of the present specification, the horizontal direction (X-axis direction) is, for example, a side where a first electrode 51 (for example, see FIGS. 3A and 3B) of the element 50 described later is provided. The vertical direction (Y-axis direction) is a direction perpendicular to the side where the first electrode 51 of the element 50 is provided.

  Next, as shown in FIGS. 2 (a) and 2 (b), within the first land 12 and on the planned area overlapping the first electrode 51 described later, and within the second land 16 and described later. A plurality of solder portions 20 are formed by applying cream solder on the regions to be overlapped with the second electrodes 52 (see, for example, FIGS. 3A and 3B). The cream solder is applied by screen printing, for example. Here, the shape (namely, planar shape) of each of the plurality of solder portions 20 in plan view is the same and the same size (namely, congruent), and is, for example, a rectangle extending long in the Y-axis direction. . A plurality of rectangular solder portions 20 are provided on the first land 12 and the second land 16, respectively, and are arranged at equal intervals in the X-axis direction orthogonal to the Y-axis direction.

  Next, as shown in FIGS. 3A and 3B, the element 50 is mounted on the wiring board 10. Here, the element 50 is, for example, a capacitor, and includes a first electrode 51, a second electrode 52, and a dielectric 53 sandwiched between the first electrode 51 and the second electrode 52. In the mounting process of the element 50, the plurality of solder portions 20 provided on the first land 12 and the first electrode 51 overlap, and the plurality of solder portions 20 provided on the second land 16 The element 50 is arranged on the surface 1a of the base substrate 1 so that the two electrodes 52 overlap. In this state, the wiring board 10 and the element 50 are passed through a reflow furnace. As a result, the plurality of solder portions 20 are melted, and one solder layer 20 ′ is formed on each of the first land 12 and the second land 16.

  4A and 4B are cross-sectional views schematically showing the formation process of the solder layer 20 '. As shown in FIG. 4A, in the above melting process, the plurality of solder portions 20 are melted, and as indicated by arrows, the plurality of solder portions 20 are provided (that is, the solder portions 20 are provided). Not wet area). Then, the adjacent solder portions 20 come into contact with each other and eventually solidify to form one solder layer 20 ′ on the first land 12 as shown in FIG. 4B. Although not shown, the formation process of the solder layer 20 'on the second land 16 is the same. As a result, the first electrode 51 and the first land 12 are connected via the solder layer 20 ′, and the second electrode 52 and the second land 16 are connected to complete the electronic component. To do.

  As described above, according to the first embodiment of the present invention, when the element 50 is mounted, the plurality of solder portions 20 are melted, and a part of the melted solder (that is, molten solder) is a solder portion. One solder layer 20 ′ is formed by wetting and spreading in an area where 20 is not provided. Accordingly, it is possible to reduce the solder left between the first electrode 51 and the first land 12 and reduce the solder left between the second electrode 52 and the first land 16. The thickness of the solder layer 20 ′ can be reduced between them. The solder layer 20 ′ can be formed thin, and the distance between the first electrode 51 and the first land 12 and the distance between the second electrode 52 and the second land 16 are reduced. Therefore, it is possible to realize a reduction in the height of the electronic component (that is, a reduction in the total thickness of the component mounting).

Further, according to the first embodiment of the present invention, the planar shape of each of the plurality of solder portions 20 is, for example, a rectangle extending long in the Y-axis direction, and these are arranged at equal intervals in the X-axis direction. Thereby, since the escape route (namely, the wetting and spreading route) of the molten solder is uniformly ensured on the first and second lands 12 and 16, the thickness of the solder layer 20 ′ can be easily made uniform.
In the first embodiment, the case where each planar shape of the plurality of solder portions 20 is rectangular has been described. However, in the present invention, these planar shapes are not limited to rectangles.

  For example, as shown in FIGS. 5A and 5B, the planar shape of each of the plurality of solder portions 20 may be a square. As shown in FIG. 5A, when the planar shape of the solder part 20 is a square, the plurality of squares are separated from each other, and are arranged so as to form rows at equal intervals in the X-axis direction and the Y-axis direction, respectively. May be. Alternatively, as shown in FIG. 5B, the plurality of squares are, for example, a plurality of columns arranged in the X-axis direction are arranged at equal intervals in the Y-axis direction, and odd-numbered columns in the Y-axis direction. And even-numbered columns may be arranged so as to be shifted by a half pitch in the X-axis direction.

  Or as shown to Fig.6 (a) and (b), each planar shape of the some solder part 20 may be circular (for example, perfect circle). As shown in FIG. 6A, the plurality of regular circles may be separated from each other, and may be arranged at equal intervals in the X-axis direction and the Y-axis direction. Alternatively, as shown in FIG. 6B, the plurality of regular circles are, for example, a plurality of rows arranged in the X-axis direction are arranged at equal intervals in the Y-axis direction, and are odd-numbered in the Y-axis direction. The rows and the even-numbered rows may be arranged so as to be shifted by a half pitch in the X-axis direction.

  Alternatively, as shown in FIGS. 7A and 7B, the planar shape of each of the plurality of solder portions 20 may be a triangle (for example, a regular triangle). As shown in FIG. 7A, the plurality of equilateral triangles are separated from each other. For example, a plurality of columns arranged in the X-axis direction are arranged at equal intervals in the Y-axis direction, and odd-numbered in the Y-axis direction. The even-numbered columns and the even-numbered columns may be arranged so as to be shifted by a half pitch in the X-axis direction. Alternatively, as shown in FIG. 7A, these regular triangles are arranged at equal intervals in the X-axis direction and the Y-axis direction, and the opposing sides 20a of adjacent regular triangles are parallel to each other. It may be arranged so that.

Alternatively, as shown in FIG. 8, the planar shape of each of the plurality of solder portions 20 may be a pentagon or more polygon (for example, a regular hexagon). As shown in FIG. 8, these regular hexagons are separated from each other, and may be arranged in a row at equal intervals in the X-axis direction and the Y-axis direction (that is, to form a honeycomb structure). It may be arranged in.)
Thus, even if the shape and arrangement of each of the plurality of solder portions 20 are any of the forms shown in FIGS. 5A to 8 and the like, the escape route of molten solder (that is, the wet spreading route) is present. Uniformly secured. For this reason, the same effect as the case of a rectangle can be produced.

(2) Second Embodiment In the first embodiment described above, the case where a plurality of solder portions are provided on each of the first land and the second land has been described. However, in the present invention, instead of providing a plurality of solder portions on the land, a plurality of openings may be provided on the land itself.
FIG. 9A to FIG. 11B are views showing a method of manufacturing an electronic component according to the second embodiment of the present invention, in which FIG. 9A is a plan view and FIG. It is sectional drawing which cut | disconnected (a) by the X9-X'9 line | wire-X11-X'11 line | wire. As shown in FIG. 9A, first, a wiring board 60 is prepared. The wiring substrate 60 includes a base substrate 1, a first wiring 61 provided on the surface 1 a of the base substrate 1, and a second wiring 65. A first land 62 is provided at the tip of the first wiring 61, and a second land 66 is provided at the tip of the second wiring 65.

  The first wiring 61 including the first land 62 and the second wiring 65 including the second land 66 are the first wiring 11 and the second wiring 15 described in the first embodiment (for example, Similarly to FIG. 1 (a) and (b)), each is made of metal such as copper foil, and the surface thereof may be plated. For example, when the metal constituting the first wiring 61 and the second wiring 65 is copper (Cu), the surface thereof may be plated with gold (Au) or tin (Sn). Further, the first land 62 and the second land 66 have the same shape (for example, a rectangle) and the same size in plan view. For example, the first land 62 and the second land 66 are adjacent to each other in a state of being separated in the Y-axis direction.

  Furthermore, as shown in FIGS. 9A and 9B, a plurality of openings having the bottom surface of the surface 1a of the base substrate 1 are formed in the planned area overlapping with the first electrode 51 in the first land 62. A portion 63 is provided. A plurality of openings 67 whose bottom surface is the surface 1 a of the base substrate 1 are also provided in a region of the second land 66 that overlaps the second electrode 52. The planar shapes of the plurality of openings 63 and 67 are the same and have the same size, for example, a rectangular shape that extends long in the Y-axis direction. The plurality of openings 63 and 67 are provided at equal intervals in the X-axis direction.

Next, as shown in FIGS. 10A and 10B, solder portions 70 are formed on the first land 62 and the second land 66, respectively. Here, each of the solder portions 70 is, for example, cream solder, and its formation is performed by screen printing. The planar shape of the solder part 70 is, for example, a rectangle that covers the openings 63 and 67 described above.
Next, as shown in FIGS. 11A and 11B, the element 50 is mounted on the wiring board 60. In the mounting process of the element 50, the solder portion 70 provided on the first land 62 and the first electrode 51 overlap, and the solder portion 70 provided on the second land 66 and the second electrode 52. Are arranged on the surface 1a of the base substrate 1 so that they overlap with each other. In this state, the wiring board 60 and the element 50 are passed through a reflow furnace. As a result, the solder portions 70 are melted on the first lands 62 and the second lands 66 to form solder layers 70 ′.

  12A and 12B are cross-sectional views schematically showing the formation process of the solder layer 70 '. As shown in FIG. 12A, in the melting process, the solder portion 70 on the first land 62 is melted, and a part thereof is provided on the first land 62 as indicated by an arrow. It enters into the plurality of openings 63. Then, the melted solder is solidified in a state where the plurality of openings 63 are buried, and becomes a solder layer 70 ′ as shown in FIG. Although not shown, the formation process of the solder layer 70 ′ on the second land 66 is the same. As a result, the first electrode 51 and the first land 62 are connected via the solder layer 70 ′, and the second electrode 52 and the second land 66 are connected to complete the electronic component. To do.

  As described above, according to the second embodiment of the present invention, when the element 50 is mounted, it is provided in the plurality of openings 63 provided in the first land 62 or in the second land 66. Part of the molten solder enters the plurality of openings 67. Accordingly, it is possible to reduce the solder left between the first electrode 51 and the first land 62 and reduce the solder left between the second electrode 52 and the first land 66. And the thickness of the solder layer 70 ′ can be reduced between them. The solder layer 70 ′ can be formed thin, and the distance between the first electrode 51 and the first land 62 and the distance between the second electrode 52 and the second land 66 are reduced. Therefore, it is possible to realize a reduction in the height of the electronic component (that is, a reduction in the total thickness of the component mounting).

  In the first embodiment, the case where each planar shape of the plurality of openings 63 and 67 is a rectangle extending in the Y-axis direction has been described. However, in the present invention, the orientation of the rectangle is not limited to the Y-axis direction. For example, as shown in FIG. 13, the planar shape of each of the plurality of openings 63 may be a rectangle that extends long in the X-axis direction. The plurality of openings 63 may be provided at equal intervals in the Y-axis direction, and one end thereof may face the outer peripheral side of the first land 62. The same applies to the plurality of openings 67 of the second land 66. Even with such a configuration, similarly to the first embodiment, the solder layer 70 ′ can be formed thin, and a reduction in the height of the electronic component can be realized.

In the present invention, the planar shape of each of the plurality of openings 63 and 67 is not limited to a rectangle. For example, as shown in FIGS. 14A and 14B, the planar shape of each of the plurality of openings 63 may be a square. Further, as shown in FIGS. 15A and 15B, the planar shape of each of the plurality of openings 63 may be a perfect circle. Further, as shown in FIGS. 16A and 16B, the planar shape of each of the plurality of openings 63 may be an equilateral triangle. Further, although not shown, each planar shape of the plurality of openings 63 may be a regular hexagon. The same applies to the plurality of openings 67 of the second land 66.
As described above, the shape of each of the plurality of openings 63 and 67 and the arrangement thereof may be any form shown in FIGS. 14 (a) to 16 (b), etc. (Wet spreading path) is ensured uniformly. For this reason, the same effect as the case of a rectangle can be produced.

(3) Third Embodiment In the present invention, the first embodiment and the second embodiment may be combined. That is, a plurality of openings may be provided in a planned region overlapping with the land electrode, and a plurality of solder portions may be provided so as to overlap each of the plurality of openings in plan view.
FIGS. 17-19 is a top view which shows the structural example of the wiring board 80 which concerns on 3rd Embodiment of this invention. For example, as shown in FIG. 17, a plurality of solder portions 20 are provided on the plurality of openings 63 so as to be orthogonal to each of the plurality of openings 63 provided in the first land 62 in plan view. May be. Similarly, a plurality of solder portions 20 may be provided on the plurality of openings 67 so as to be orthogonal to each of the plurality of openings 67 provided in the second land 66 in plan view. In this example, the planar shape of each of the plurality of openings 63 and 66 is a rectangle that extends long in the X-axis direction, and the planar shape of each of the plurality of solder portions 20 is a rectangle that extends long in the Y-axis direction.

  With such a configuration, when the element 50 is mounted on the wiring board 80, the plurality of solder portions 20 are melted, and a part of the molten solder spreads in a region where the solder portions 20 are not provided. A part of the molten solder enters into the openings 63 and 67, respectively. Therefore, compared to the first and second embodiments, it is possible to reduce the amount of solder left between the first electrode 51 and the first land 12, and the second electrode 52 and the first land. The amount of solder left between the land 16 and the land 16 can be reduced. As a result, the solder layer can be formed thinner.

  In the third embodiment, when the planar shape of each of the plurality of openings 63 and 67 is the first shape and the planar shape of each of the plurality of solder portions 20 is the second shape, The shape and the second shape are similar, and the second shape is preferably larger than the first shape. Further, in the step of providing the plurality of solder portions 20, it is preferable that each of the plurality of openings 63 and 67 is completely covered with each of the plurality of solder portions 20.

  For example, as shown in FIG. 18, in the wiring substrate 80 before the element is mounted, the planar shape (first shape) of each of the plurality of openings 63 and 67 is a rectangle, and the plurality of solder portions 20 Each planar shape (second shape) is also a rectangle. The first shape and the second shape are similar, and the second shape is larger than the first shape. Moreover, each of the plurality of openings 63 and 67 is completely covered by each of the plurality of solder portions 20.

  Alternatively, as shown in FIG. 19, in the wiring board 80 before the element is mounted, the planar shape (first shape) of each of the plurality of openings 63 and 67 is a perfect circle, and the plurality of solder portions 20. Each planar shape (second shape) is also a perfect circle. The first shape is similar to the second shape, and the second shape is larger than the first shape. Moreover, each of the plurality of openings 63 and 67 is completely covered by each of the plurality of solder portions 20.

  In the element mounting process, by using such a wiring substrate 80, the molten solder can easily enter the plurality of openings 63 and 67. In addition, since the planar shape of each of the plurality of solder portions 20 is larger than the planar shape of each of the plurality of openings 63 and 67, the connection between the first electrode 51 and the first land 62, In addition, it is possible to easily leave the solder necessary for the connection between the second electrode 52 and the second land 66, respectively.

  In the third embodiment, the first shape and the second shape are each a rectangle or a regular circle. However, in the present invention, the first shape and the second shape are the same. It is not limited. For example, as in the first and second embodiments, the first shape and the second shape may be regular triangles or pentagons. Even in such a case, the same effects as in the examples shown in FIGS. 17 to 19 can be obtained.

(4) Other Embodiments In the present invention, the base substrate 1 is not limited to a flexible substrate, and may be a rigid substrate. Further, the material of the base substrate 1 is not limited to polyimide, and each insulation such as phenol, epoxy, glass epoxy, Teflon (registered trademark), alumina, PET (polyethylene terephthalate), PEN (polyethylene naphthalate), etc. Materials can be used.

In the present invention, the materials of the first wirings 11 and 61 and the second wirings 15 and 65 are not limited to copper (Cu), and conductive materials such as aluminum and graphite are used. it can.
In the present invention, the element 50 is not limited to a capacitor. The element 50 may be, for example, a resistance element, in which case a resistor is disposed between the first electrode 51 and the second electrode 52.

DESCRIPTION OF SYMBOLS 1 Base substrate, 1a surface 10, 60, 80 Wiring board, 11, 61 1st wiring, 12, 62 1st land, 15, 65 2nd wiring, 16, 66 2nd land, 20, 70 Solder part (before melting), 20 ', 70' Solder layer (after melting), 50 elements (for example, capacitor or resistance element), 51 1st electrode, 52 2nd electrode, 53 dielectric

Claims (8)

Providing a plurality of solder portions on a land provided on the substrate;
Arranging the element so that the plurality of solder portions and the electrode of the element are in contact with each other;
The method of manufacturing an electronic component comprising: a step of heating and melting the plurality of solder portions to form a solder layer, and connecting the electrode and the land via the solder layer. An opening is provided in a region of the land that overlaps the electrode;
2. The method of manufacturing an electronic component according to claim 1, wherein in the step of connecting the electrode and the land, molten portions of the plurality of solder portions are caused to enter the opening. The land is provided with a plurality of openings as the openings,
When the shape of each of the plurality of openings in plan view is the first shape, and the shape of each of the plurality of solder portions in plan view is the second shape, the first shape and the second shape The shape is similar and the second shape is larger than the first shape,
The method of manufacturing an electronic component according to claim 2, wherein, in the step of providing the plurality of solder portions, each of the plurality of openings is covered with each of the plurality of solder portions. In the step of providing the plurality of solder portions,
4. The electronic component according to claim 1, wherein each of the plurality of solder portions has the same shape and the same size in a plan view, and is arranged at equal intervals. 5. Manufacturing method. Providing a solder portion on a land provided on the substrate;
Arranging the element so that the solder portion and the electrode of the element are in contact with each other;
Heating and melting the solder portion to form a solder layer, and connecting the electrode and the land via the solder layer,
The land is provided with an opening,
In the step of connecting the electrode and the land, a molten part of the solder part is caused to enter the opening part. A wiring board to which elements having electrodes are attached,
A substrate,
Lands provided on the substrate;
A wiring board comprising: a plurality of solder portions provided in a predetermined region overlapping the electrode of the land. An opening is provided in a region of the land that overlaps the electrode;
The wiring board according to claim 6, wherein at least a part of the opening portion and the plurality of solder portions overlap in a plan view. A wiring board to which elements having electrodes are attached,
A substrate,
A land provided on the substrate,
A wiring board, wherein an opening is provided in a region of the land that overlaps the electrode.

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