JP2008066411A - Electronic component mounting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic component mounting structure which is improved in mounting density and connection reliability. <P>SOLUTION: The electronic component mounting structure for mounting electric components 130 arranges the electronic components 130 having a plurality of terminals 132 extending from the body portion thereof 131 on a substrate 110 and electrically connects the terminals 132 and a land 112 via solder 113. Each of the terminals 132 has a surface mounting portion 132a that runs along the surface of the substrate 110 where the electric components are disposed, and an insertion-mounting portion 132b that projects from the surface mounting portion 132a to the substrate side serving as a region connected to the land 112; a non-through hole 111 in which the width of an upper opening is larger than that of a bottom surface and a connection surface between the bottom surface and the opening has a tapered shape is formed at the substrate 110 so as to correspond to the insertion-mounting portion 132b; and the land 112 which is formed around the wall surface and an opening of the non-through hole 111 is electrically connected to each terminal 132 in a state that the land 112 including the circumferential part of the non-through hole 111 is arranged. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electronic component mounting structure.

  2. Description of the Related Art Conventionally, as a mounting structure of an electronic component on a board, a terminal of the electronic component is disposed through a through hole provided in the board, and a land and a terminal provided around the through hole wall surface and its opening are electrically connected. (Insertion mounting structure) is known. However, in the case of the insertion mounting structure, the terminal protrudes from the through hole on the back surface (hereinafter referred to as the back surface) of the electronic component placement surface of the substrate. Therefore, it is difficult to mount different electronic components including the through-hole forming part on the back surface side, and it is difficult to improve the mounting density of the electronic components as the whole substrate (both surfaces).

On the other hand, Patent Document 1 discloses a mounting structure in which a lead wire (terminal) of an insertion part with a lead wire is inserted into a non-through-through hole provided in a substrate. According to this, it becomes possible to mount a different electronic component including the part corresponding to the non-through-hole hole on the back surface side, and the mounting density of the electronic component can be improved.
Japanese Patent Laid-Open No. 10-41605

  However, in the case of the mounting structure disclosed in Patent Document 1, the contact area between the terminal (land) and the solder is reduced as compared with the mounting structure in which the terminal is disposed through the through hole that penetrates the substrate. Therefore, a stress per unit area generated in the joint due to an external force or a temperature change (difference in linear expansion coefficient) is large, and the connection state between the terminal and the land may be deteriorated. That is, there is a problem in connection reliability.

  In addition to the insertion mounting structure described above, a structure (surface mounting structure) is also known in which the tip of the terminal is placed along the surface of the substrate and the land provided on the surface of the substrate and the terminal are electrically connected. . In the case of the surface mounting structure, since different electronic components can be mounted on the back surface side, the mounting density of the electronic components can be improved.

  However, in the case of the surface mounting structure, since reflow is performed with the terminals arranged on the corresponding lands, the solder is not cooled and solidified (melted state) between the terminals and the corresponding lands. Misalignment is likely to occur. For example, when the substrate (electronic component housing) is deformed (warped or the like) due to a difference in linear expansion coefficient during reflow, there is a risk that the terminal is displaced from the corresponding land or the terminal is dropped from the land. Also, as the number of terminals increases, it is more difficult to ensure the coplanarity of the connection part with the land of the terminal, and it is difficult to ensure the connection between all the terminals and the corresponding land due to the influence of the warp of the board etc. Become. That is, there is a problem in connection reliability.

  In view of the above problems, an object of the present invention is to provide an electronic component mounting structure capable of improving mounting density and connection reliability.

  In order to achieve the above object, according to the first aspect of the present invention, an electronic component having a plurality of terminals extending from a main body is disposed on a board, and the terminals and corresponding lands provided on the board are soldered. The electronic component mounting structure is formed by electrically connecting via a surface mounting portion along the electronic component placement surface of the substrate as a connection portion with the land, and from the surface mounting portion to the substrate side. The board has a non-through hole into which the insertion mounting part is inserted, the insertion mounting part is inserted into the non-through hole, and the terminal is connected to the wall of the non-through hole of the board and the electronic It is electrically connected to the corresponding land provided around the opening of the non-through hole on the component placement surface, and the non-through hole is along the electronic component placement surface of the board with the land provided on the surface thereof. The width W1 of the upper opening in the same direction is greater than the width W2 of the bottom of the hole. Large connecting surface that connects the upper opening portion and the hole bottom, characterized in that it is tapered.

  As described above, according to the present invention, since the insertion mounting portion inserted into the non-through hole serves as an anchor, the terminal is in a state before the terminal and the land are electrically connected (solder is molten). Can be prevented from being displaced between the corresponding land and the corresponding land. Further, as a connection portion with the land, a surface mounting portion and an insertion mounting portion are provided on the terminal, and a land is provided around the non-through hole wall surface and the non-through hole opening of the electronic component placement surface on the substrate. In addition, since reflow is performed with the insertion mounting portion inserted into the non-through hole, the insertion mounting portion can be mounted even if the distance between the surface mounting portion and the corresponding land (substrate surface) around the non-through hole opening varies slightly. As a result, the solder gets wet on the surface mounting part. Therefore, the contact area between the terminal (land) and the solder sufficient to satisfy the desired connection reliability can be ensured. In other words, connection reliability can be improved as compared to the conventional case. In addition, since the contact area with solder is larger than before, it is possible to cope with a large current.

  In addition, since the hole into which the insertion mounting portion is inserted is a non-through hole, it is possible to mount a different electronic component including a portion corresponding to the non-through hole on the back surface of the electronic component placement surface of the substrate. That is, the mounting density of electronic components on the substrate can be improved.

  Furthermore, the width W1 of the upper opening portion in the same direction along the electronic component placement surface of the substrate is larger than the width W2 of the bottom surface of the substrate with the land provided on the surface, and the upper opening portion The connecting surface that connects the bottom of the hole is tapered. With such a configuration, when the solder is placed on the land using the screen printing method, the paste-like solder is easily filled up to the corner of the non-through hole, and air hardly remains in the non-through hole. Further, since the upper opening portion is wider than the bottom surface of the hole, it is easy to insert the insertion mounting portion into the non-through hole filled with solder, and air remaining in the solder in the non-through hole easily escapes to the outside during heating (for example, reflow). . Therefore, the air remaining in the solder after mounting (after joining) is reduced (the occurrence of voids is reduced). That is, durability can be improved. Further, connection reliability can be improved by increasing the connection area.

  As described in claim 2, the non-through hole is preferably set so that the width W1 and the depth D from the upper opening portion to the bottom of the hole satisfy the relationship of W1> D.

  As the depth of the non-through hole increases, the amount of air in the hole increases and the amount of air remaining in the solder after mounting increases. On the other hand, when the non-through hole has a shape that satisfies the above-described relationship, air can easily escape to the outside of the hole. Further, since the upper opening portion is wider than the depth, it becomes easy to fill the hole with paste-like solder. That is, durability and connection reliability can be further improved.

  As described in claim 3, the non-through hole may be set so that the width W1, the width W2, and the depth D satisfy a relationship of W1> W2> D. According to this, since the upper opening portion is wider than the bottom surface of the hole, it is easy to insert the insertion mounting portion into the non-through hole filled with solder, and the air remaining in the solder in the non-through hole during heating (for example, reflow) Easy to escape. Therefore, durability and connection reliability can be further improved.

  According to a fourth aspect of the present invention, the substrate is a multilayer substrate in which wiring patterns including lands on a base material are stacked and arranged in multiple stages, and the insertion mounting portion is electrically connected to the wiring pattern arranged inside the base material. It is good also as the structure connected in general.

  According to this, in the configuration in which the land and the wiring pattern disposed inside the base material are electrically connected, the land and the wiring pattern can be electrically connected by the insertion mounting portion instead of the connection via. . Therefore, since the connection via can be eliminated, a wiring pattern extending from the land to connect with the connection via on the electronic component placement surface of the substrate is also unnecessary, and the mounting efficiency of the electronic component can be improved. In addition, the degree of freedom of the wiring pattern can be improved.

  The number of insertion mounting portions and surface mounting portions included in one branch terminal is not particularly limited. For example, one may be included. Further, as described in claim 5, it is also possible to adopt a configuration in which a plurality of insertion mounting portions are provided in one branch terminal, and the plurality of insertion mounting portions are separated from each other in the plane direction of the substrate. In this case, since the connection area by the insertion mounting part increases, connection reliability can be improved.

  In the terminal structure according to the fifth aspect, for example, as described in the sixth aspect, a plurality of insertion mounting portions may be inserted into the same non-through hole. Further, as described in claim 7, the plurality of insertion mounting portions are respectively inserted into different non-through holes, and the lands provided in the non-through holes are integrated as one land. It is good also as a structure.

  According to the structure of Claim 6, the air which remains in the solder at the time of mounting easily escapes out of the hole through the gap between the insertion mounting portions that are separated from each other. Therefore, connection reliability and durability can be further improved in a configuration in which a plurality of insertion mounting portions of the same branch terminal are inserted into one non-through hole. According to the structure of Claim 7, compared with the structure of Claim 6, the magnitude | size (width | variety of an upper opening part) of the non-through hole in the plane direction of a board | substrate can be made small. Therefore, the manufacturing cost can be reduced.

  Further, in the configuration according to claim 7, when the plurality of insertion mounting portions are connected by the surface mounting portion as described in claim 8, the configuration of the branched terminal can be simplified. it can.

  According to a ninth aspect of the present invention, in the height direction, a predetermined range from the insertion tip of the insertion mounting portion may have a tapered shape whose diameter is reduced in the tip direction. According to this, it becomes easy to insert an insertion mounting part at the time of mounting with respect to the non-through hole whose upper opening part is larger than a hole bottom face and a connection surface is a taper shape.

  According to a tenth aspect of the present invention, the branched terminal may have a stress relaxation portion between the main body portion, the surface mounting portion, and the insertion mounting portion. According to this, it is possible to relieve the stress caused by the temperature change at the time of mounting and to reduce the positional deviation between the terminal and the land. In addition, since the external stress transmitted to the connection portion between the terminal and the land can be reduced after mounting, the connection reliability (life) can be improved.

  According to the eleventh aspect, the main body portion of the electronic component has a shape that is long in one direction with respect to the electronic component arrangement surface, and a plurality of terminals, together with branch terminals, are connected to the land as electronic component arrangement portions. It is good also as a structure including the surface mount type terminal along a surface, and a branched terminal and a surface mount type terminal are alternately arrange | positioned with respect to the main-body part in the longitudinal direction.

  According to this, since every other branch terminal is used, the connection reliability can be improved as compared with the conventional case. In addition, since only some of the plurality of terminals are branched terminals, the number of non-through holes formed in the substrate can be reduced. Therefore, the degree of freedom of the wiring pattern formed on the substrate can be improved.

  In addition, as described in claim 12, the main body of the electronic component has a shape that is long in one direction with respect to the electronic component placement surface, and the plurality of terminals are all branched terminals and are long in relation to the main body. It is good also as a structure arranged in the direction. According to this, since all the terminals are branched terminals, the connection reliability can be further improved.

  In the configuration in which all the terminals are branched terminals, for example, as in claim 13, in the longitudinal direction, the width W1 of the non-through hole corresponding to the lands on both ends is a land in the central region sandwiched between the both ends. It is good also as a structure made larger than the width W1 of the non-through-hole corresponding to. The positional deviation between the terminal and the land caused by the stress accompanying the temperature change at the time of mounting is larger at the end than in the central region. Therefore, according to the above configuration, even if a positional deviation occurs, the mounting insertion portion can be retained in the non-through hole (allowable positional deviation can be increased). That is, connection reliability can be ensured. In addition, since the amount of solder at the end that is easily affected by temperature change (cooling shock) during use can be increased, connection reliability (lifetime) can be improved. The land located at one end is not limited to one.

  In the configuration in which all the terminals are branch terminals, all the lands connected to the branch terminals are connected to the surface mounting portion on the side closer to the main body portion as described in claim 14. It is good also as a structure which is a 1st land by which the side far from a part was made into the connection part with an insertion mounting part. Further, as described in claim 15, the second land in which the side closer to the main body part is a connection part with the insertion mounting part and the side far from the main body part is a connection part with the surface mounting part. A certain configuration may be adopted.

  When the positional relationship between the main body and the land is the same, according to the configuration of claim 14, the opposing distance between the main body and the insertion mounting portion in the plane direction of the substrate is larger than that of the configuration of claim 15. Therefore, it is possible to effectively reduce the positional deviation between the terminal and the land with respect to the stress in the rotation direction with respect to the electronic component (stress that is substantially perpendicular to the longitudinal direction of the electronic component and opposite to both ends). it can. According to the configuration of claim 15, since the opposing distance between the main body portion and the insertion mounting portion is shorter than that of the configuration of claim 14, the terminal against the stress in the longitudinal direction on the electronic component It is possible to effectively reduce the positional deviation between the land and the land.

  Further, as described in claim 16, as the land connected to the branched terminal, the side closer to the main body is a connection site with the surface mounting portion, and the side far from the main body is the insertion mounting portion. A first land that is a connection site, a second land that is a connection site to the insertion mounting portion on a side closer to the main body portion, and a second land that is a connection site to the surface mounting portion on the side far from the main body portion However, it is good also as a structure provided alternately along the longitudinal direction. According to this, the effect equivalent to the invention of Claim 14 and the effect equivalent to the invention of Claim 15 can be combined. Further, since the positions of the non-through holes are alternated between the side closer to the main body and the side far from the main body, the configuration according to claim 14 and 15 (the positions of the non-through holes are the same along the longitudinal direction). Thus, it is possible to increase the size (width) of the non-through hole. According to this, the allowable amount of positional deviation can be increased.

  The electronic component placement surface of the substrate does not perform a GND pattern, a wiring pattern electrically connected to the land, or an electrical connection function around the land connected to the branched terminal A configuration may be employed in which at least one of a dummy wiring pattern and a silk pattern is arranged.

  According to this, since the resist thickness formed around the land (the resist thickness here is the thickness of the protective portion around the land) can be increased, the land (especially the surface mounting portion is arranged) by screen printing. It is possible to increase the thickness of the solder disposed on the portion to be formed). That is, connection reliability (lifetime) can be improved.

  The land arranged in the non-through hole may be formed by plating. If the plating method is used, even if the connecting surface of the non-through hole in the state where the land is not arranged is not tapered, it can be tapered in the state where the land is arranged.

  The invention according to any one of claims 1 to 18 is suitable as a mounting structure for a connector as an electronic component, as described in claim 19.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a side view showing a schematic configuration of the entire electronic component mounting structure. 2A and 2B are diagrams showing a schematic configuration of an electronic component (connector) for realizing the mounting structure according to the first embodiment. FIG. 2A is a side view (viewed from the longitudinal direction), and FIG. It is a figure (side view seen from the transversal direction). FIG. 3 is an enlarged cross-sectional view around the connection site.

  As shown in FIG. 1, the circuit board 100 is obtained by mounting electronic components 120 and 130 on a board 110. In the present embodiment, of the electronic components 120 and 130, the connector 130 has a characteristic mounting structure. The electronic component 120 other than the connector 130 is, for example, a microcomputer, a power transistor, a capacitor, a resistor, or the like.

  In this embodiment, as the substrate 110, a multilayer substrate in which resin is used as a base material and wiring patterns are arranged in multiple layers with respect to the base material is employed. The configuration of the substrate 110 is not limited to the above example, and a known configuration can be adopted.

  Next, the structure of the connector 130 (electronic component 130) is demonstrated using FIG. 2 (a), (b). As shown in FIGS. 2A and 2B, the connector 130 is made of a conductive material in a housing 131 made of an insulating material (for example, synthetic resin), one end is mounted on the substrate 110, and the other end is connected to the outside. A plurality of terminals 132 provided for the connection are provided. In the present embodiment, the housing 131 corresponds to the main body described in the claims.

  The housing 131 has a shape that is long in one direction (for example, the x direction) in the plane direction (for example, the x, y direction) of the substrate 110. In the present embodiment, the plurality of terminals 132 are arranged in two rows along the longitudinal direction of the housing 131 at the portion embedded in the housing 131, and the connection portions with the lands provided on the substrate 110 are arranged in one row. Yes. However, the arrangement of the terminals 132 is not limited to the above example, and may be any configuration as long as it is arranged at least along the longitudinal direction of the housing 131.

  The terminal 132 is a so-called punched terminal formed by punching a metal plate, for example, and is partially embedded and fixed in the housing 131 so as not to interfere with each other. The side of the terminal 132 mounted on the substrate 110 is a land provided on the substrate 110 at the tip of a portion that protrudes substantially parallel to the substrate 110 from one side of the housing 131 and is bent substantially vertically downward (substrate 110 side). It is comprised as a connection part. In the present embodiment, the land mounting portion includes a surface mounting portion 132 a along the surface of the substrate 110 and an insertion mounting portion 132 b protruding from the surface mounting portion 132 a toward the substrate 110.

  More specifically, the surface mounting portion 132a is substantially parallel to the surface of the substrate 110, and the insertion mounting portion 132b is provided substantially perpendicular to the surface of the substrate 110 (surface mounting portion 132a). The length along the substrate surface of the surface mounting portion 132a and the length from the surface mounting portion 132a of the insertion mounting portion 132b are within the range where the length of the insertion mounting portion 132b does not penetrate the substrate 110 in the mounted state. What is necessary is just to set suitably, in order to ensure desired connection reliability (contact area with a solder).

  As described above, the connector 130 according to the present embodiment includes the branch-shaped terminal 132 in which the connection portion with the land provided on the substrate 110 is branched into the surface mounting portion 132a and the insertion mounting portion 132b. Adopted as all terminals.

  Next, a mounting method and a mounting structure of the connector 130 having the above configuration will be described with reference to FIG. As shown in FIG. 3, a non-through hole 111 is formed in the substrate 110 on which the connector 130 is mounted. The non-through hole 111 is formed at a predetermined position on the substrate 110 with a predetermined depth corresponding to the insertion mounting portion 132 b of the terminal 132. Such a non-through hole 111 can be formed by a known technique (mechanical processing such as a drill or laser processing). A land 112 is formed over the wall surface of the non-through hole of the substrate 110 and the periphery of the non-through hole of the connector arrangement surface. Such a land 112 can be formed by a known technique (plating, metal foil etching, etc.). In FIG. 3, wiring patterns arranged on the surface and inside of the substrate 110 are omitted.

  Then, the solder 113 is applied to the substrate 110 configured as described above in the non-through holes 111 and on the peripheral portions of the lands 112 around the non-through holes. The coating method is not particularly limited, and a known technique (for example, screen printing, coating with a dispenser) can be employed. In this embodiment, the paste-like solder 113 adjusted to a predetermined viscosity is applied in the non-through holes 111 and on the peripheral portions of the lands 112 by screen printing.

  After applying the solder 113, the connector 130 is positioned on the substrate 110. Thereby, the insertion mounting portion 132 b is inserted into the non-through hole 111 and comes into contact with the paste-like solder 113 disposed in the non-through hole 111. Further, the surface mounting portion 132 a comes into contact with the paste-like solder 113 arranged on the peripheral portion of the non-through hole of the land 112.

  Thus, in this embodiment, since the insertion mounting part 132b is inserted into the non-through hole 111, the positioning of the connector 130 with respect to the board 110 is easy. Moreover, since the insertion mounting part 132b plays the role of an anchor, it is possible to suppress displacement of the substrate 110 in the plane direction.

  Then, reflow is performed with the connector 130 disposed on the substrate 110. The molten solder 113 wets the terminal 132 and is preferably cooled and solidified in a state where a fillet is formed between the terminal 132 and the terminal 132. That is, as shown in FIG. 3, the terminal 132 and the land 112 are connected (joined) electrically and mechanically via the solder 113.

  In the present embodiment, reflow is performed in a state where the insertion mounting portion 132b is inserted into the non-through hole 111. Therefore, even when the contact between the surface mounting portion 132a and the solder 113 is not sufficient due to the variation in the height direction of the terminal 132 with respect to the substrate surface, the molten solder 113 is inserted into the surface mounting portion 132a via the insertion mounting portion 132b. It is possible to secure a desired contact area between the terminal 132 and the solder 113, which is sufficient to ensure the connection reliability.

  During reflow, warpage or the like of at least one of the substrate 110 and the housing 131 in a state (cooled state) before the solder 113 is cooled and solidified due to a difference in linear expansion coefficient between the substrate 110 and the housing 131 of the connector 130. May occur. In particular, as in the connector 130 shown in the present embodiment, in the case of an electronic component having a configuration that has a shape that is long in one direction in the planar direction of the substrate 110 and a plurality of terminals 132 are arranged along the longitudinal direction, The amount of deformation described above increases toward the end in the longitudinal direction. That is, in the connection between the terminal 132 and the corresponding land 112, the connection reliability tends to decrease toward the end side. However, according to the mounting structure according to the present embodiment, as described above, since the insertion mounting portion 132b inserted into the non-through hole 111 serves as an anchor, the state before the solder 113 is cooled and solidified. In the (molten state), it is possible to prevent a positional deviation from occurring between the terminal 132 and the corresponding land 112.

  As described above, according to the mounting structure of the electronic component 130 (connector 130) according to the present embodiment, the insertion mounting portion 132b inserted into the non-through hole 111 serves as an anchor, so that the solder 113 is cooled and solidified. It is possible to prevent a positional shift between the terminal 132 and the corresponding land 112 in a state before the operation. Further, as a connection portion with the land 112, a surface mounting portion 132a and an insertion mounting portion 132b are provided on the terminal 132, and the corresponding land 112 is connected to the non-through hole wall surface of the board 110 and the periphery of the non-through hole opening on the connector arrangement surface. Provided. In addition, since reflow is performed with the insertion mounting portion 132b inserted in the non-through hole 111, contact between the surface mounting portion 132a and the solder 113 is not sufficient due to variations in the height direction of the terminal 132 with respect to the substrate surface. However, the melted solder 113 wets the surface mounting portion 132a through the insertion mounting portion 132b. Therefore, the contact area between the terminal 132 (land 112) and the solder 113 sufficient to satisfy the desired connection reliability can be ensured. In other words, connection reliability can be improved as compared to the conventional case. In addition, since the contact area with the solder 113 is larger than before, it is possible to cope with a large current.

  Further, in the present embodiment, since the hole into which the insertion mounting portion 132b is inserted is the non-through hole 111, the back surface of the connector arrangement surface of the board 110 corresponds to the non-through hole 111 as shown in FIG. It is possible to mount the electronic component 120 different from the connector 130 including the portion. That is, the mounting density of the electronic components 120 and 130 on the board 110 (circuit board 100) can be improved. The electronic component 120 mounted on the back surface of the connector arrangement surface may be mounted before (after mounting) the connector 130. Moreover, what is necessary is just to mount the other electronic component 120 mounted in a connector arrangement | positioning surface as shown in FIG.

(Second Embodiment)
Next, a second embodiment of the present invention will be described based on FIG. FIG. 4 is a front view (side view seen from the short side) showing a schematic configuration of the electronic component 130 (connector 130), which is a main part of the mounting structure of the electronic component 130 according to the second embodiment. FIG. 4 corresponds to FIG. 2B shown in the first embodiment.

  Since the mounting structure of the electronic component 130 (connector 130) in the second embodiment is often the same as that of the first embodiment, the detailed description of the common parts will be omitted below, and different parts will be described mainly. .

  In 1st Embodiment, the example which employ | adopts the branch-shaped terminal 132 which has the surface mounting part 132a and the insertion mounting part 132b as all the some terminals was shown. Such a configuration is preferable in terms of connection reliability. On the other hand, in this embodiment, as shown in FIG. 4, as a plurality of terminals, some of the terminals are the branch-shaped terminals 132 shown in the first embodiment (hereinafter referred to as branch terminals 132), The rest is a surface mount type terminal 133 (hereinafter referred to as a surface mount type terminal 133).

  The surface-mounted terminal 133 has only the surface-mounted portion 132 a of the branched terminal 132 as a connection site with the land 112. That is, only the insertion mounting portion 132b is not provided, and the subsequent configuration is substantially the same as that of the branch terminal 132.

  Further, the non-through hole 111 is not formed in the portion corresponding to the surface mount type terminal 133 of the substrate 110, and the land 112 corresponding to the surface mount type terminal 133 is formed on the connector arrangement surface.

  Thus, even if some of the plurality of terminals are branched terminals 132 and the rest are surface-mounted terminals 133, the mounting density and the connection reliability can be improved as compared with the conventional case. In addition, with such a configuration, only some of the plurality of terminals 132 and 133 are branched terminals 132, and therefore, formed on the substrate 110 as compared with the mounting structure shown in the first embodiment. The number of non-through holes 111 can be reduced. Therefore, the degree of freedom of the wiring pattern formed on the substrate 110 can be improved.

  In the present embodiment, as in the first embodiment, the housing 131 of the connector 130 has a shape that is long in one direction in the plane direction of the substrate 110, and the plurality of terminals 132 and 133 are arranged along the longitudinal direction. Adopted. Therefore, as shown in the first embodiment, the amount of deformation of the substrate 110 (housing 131) that occurs during reflow increases toward the end in the longitudinal direction. That is, in the connection between the terminals 132 and 133 and the corresponding land 112, the connection reliability tends to decrease toward the end side. Therefore, in the present embodiment, the branched terminals 132 are arranged at least at both ends in the longitudinal direction (in FIG. 4, two branched terminals 132 are arranged from both ends in the longitudinal direction) and sandwiched between the branched terminals 132. A surface mount type terminal 133 is arranged in the central region. As described above, if the branch terminal 132 is disposed only in a place where the connection reliability is likely to decrease, it is effective in improving the mounting density and the connection reliability and reducing the number of the non-through holes 111. However, the arrangement of the branch terminal 132 and the surface mount type terminal 133 is not limited to the above example.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIGS. 5A and 5B are diagrams showing a schematic configuration of the substrate 110, which is a main part of the mounting structure of the electronic component 130 according to the third embodiment. FIG. 5A is a plan view in the vicinity of the land 112, and FIG. It is sectional drawing which follows the AA line | wire of (). 6 is a cross-sectional view for explaining the effect of the non-through hole 111 shown in FIG. 5, where (a) is an effect at the time of screen printing, (b) is an effect at the time of mounting, and (c) is the same condition. The comparison object is shown. In FIGS. 5A and 5B, for the sake of convenience, parts other than the land 112 arranged on the surface of the substrate 110 are omitted.

  Since the mounting structure of the electronic component 130 (connector 130) in the third embodiment is often the same as that of the first and second embodiments, detailed description of the common parts will be omitted, and different parts will be emphasized. Explained.

  In the first and second embodiments, the shape of the non-through hole 111 is not particularly mentioned. On the other hand, in the present embodiment, the solder 113 is disposed on the land 112 by using the screen printing method. In the state that the non-through hole 111 is provided with the land 112 on the surface thereof, the width W1 of the upper opening portion in the same direction along the electronic component placement surface of the substrate 110 is larger than the width W2 of the hole bottom, The connection surface that connects the opening portion and the bottom surface of the hole is tapered.

  Specifically, as shown in FIGS. 5A and 5B, the non-through hole 111 has an upper opening portion 111a and a bottom surface 111b each having a substantially square plane, and the upper opening portion in the plane direction of the substrate. The width W1 of 111a is set larger than the width 111b of the bottom surface 111b in the same direction. In other words, the opening area of the upper opening portion 111a is set larger than the area of the bottom surface 111b. And the upper opening part 111a and the bottom face 111b are connected by the taper-shaped connection surface 111c. In addition, the code | symbol 112a shown to Fig.5 (a) is a connection site | part with the surface mounting part 132a among the lands 112, and the code | symbol 112b is a connection site | part with the insertion mounting part 132b.

  When the paste-like solder 113 is arranged on the land 112 using the screen printing method, as shown in FIG. 6A, the paste-like solder is moved together with the direction of the squeegee (the direction of the white arrow in FIG. 6A). Solder 113 is introduced into the non-through hole 111. At this time, in the non-through hole 111 having the shape shown in FIGS. 5A and 5B, the width W1 of the upper opening portion 111a is larger than the width W2 of the bottom surface 111b, and the connecting surface 111c is tapered. The solder 113 is introduced to the corner of the non-through hole 111 (for example, the bottom side corner portion 111d constituted by the bottom surface 111b and the connecting surface 111c). That is, the air in the non-through hole 111 is pushed out of the non-through hole 111 by the solder 113 (solid arrow shown in FIG. 6A). Therefore, the air remaining in the solder 113 after screen printing can be reduced. In contrast, in the non-through hole 111 that does not satisfy the conditions shown in the present embodiment, the solder 113 spreads to the corner of the non-through hole 111 (for example, the bottom surface side corner 111d) as shown in FIG. 6C. In other words, after screen printing, a large amount of air remains in the area 140 where the solder 113 is not present (that is, the area where air remains in the non-through hole 111) and the solder 113.

  Even when the electronic component 130 (connector 130) is mounted, in the non-through hole 111 having the shape shown in FIGS. 5A and 5B, for example, as shown in FIG. Since the width W1 is larger than the width W2 of the bottom surface 111b, the insertion mounting portion 132b of the branched terminal 132 can be easily inserted into the non-through hole 111 filled with the solder 113. Further, since the width W1 of the upper opening portion 111a is larger than the width W2 of the bottom surface 111b and the connecting surface 111c is tapered, the distance between the insertion mounting portion 132b and the wall surface (connecting surface 111c) of the non-through hole 111 The air remaining in the solder 113 in the non-through hole 111 during heating (for example, reflow) is likely to escape from the non-through hole 111 to the outside (solid arrow shown in FIG. 6B). On the other hand, in the non-through hole 111 that does not satisfy the conditions shown in the present embodiment, as shown in FIG. 6C, the insertion mounting portion 132b and the non-through hole are compared with the configuration of FIG. Since the distance between the wall surface 111 and the wall surface 111 is narrow, air remaining in the solder 113 in the non-through hole 111 is difficult to escape from the non-through hole 111 to the outside during heating (for example, reflow) (solid arrow shown in FIG. 6C) ).

  As described above, when the mounting structure of the electronic component 130 shown in the first or second embodiment is realized by adopting the shape of the non-through hole 111 according to this embodiment and using the screen printing method, after mounting (after bonding) ) In the solder 113 can be reduced (void generation is reduced). That is, it is possible to improve the durability of the connection portion between the branched terminal 132 and the land 112 (that is, the mounting structure of the electronic component 130). Further, connection reliability can be improved by increasing the connection area.

  In the present embodiment, the non-through hole 111 is configured such that the width W1 of the upper opening portion 111a is larger than the width W2 of the bottom surface 111b, and the connecting surface 111c is tapered. On the other hand, in addition to the above-described configuration, as shown in FIG. 5B, when the depth from the upper opening portion 111a to the bottom surface 111b is D, preferably W1> D relationship, more preferably W1> W2>. The non-through hole 111 may be set so as to satisfy the relationship D. As the depth D of the non-through hole 111 increases, the air amount in the hole increases and the air remaining in the solder 113 after mounting increases. On the other hand, when the non-through hole 111 has a shape that satisfies the above-described relationship, air can easily escape from the hole. In addition, since the width W1 of the upper opening portion is wider than the depth D, it becomes easier to fill the solder paste 113 in the hole. That is, durability and connection reliability can be further improved. Further, if the shape satisfies the relationship described later, the above-described relationship is satisfied, and the width W1 of the upper opening portion is wider than the width W2 of the bottom surface 111b, so the insertion mounting portion 132b is filled with the solder 113. The air remaining in the solder 113 in the non-through hole 111 is easily released to the outside during heating (for example, reflow). Therefore, durability and connection reliability can be further improved.

  In the present embodiment, as shown in FIG. 5B, the non-through hole 111 formed in the substrate 110 and the above-described conditions even when the land 112 is not arranged (in other words, in an incomplete state). An example configured to satisfy is shown. The non-through hole 111 having such a shape can be formed, for example, by laser processing the substrate 110. However, it suffices if the above condition is satisfied in a state where the land 112 is arranged. That is, as shown in FIG. 7, the non-through hole 111 in a state where the land 112 is not arranged (in other words, an incomplete state) may have a shape that does not satisfy the above-described condition. In this case, even if the wall surface of the non-through hole 111 in a state where the land 112 is not arranged is not tapered by using a plating method (for example, electroplating after electroless plating), the taper is formed in a state where the land 112 is arranged. It can be. When this method is employed, the non-through hole can be formed by a drill or the like, for example, and the cost can be reduced. FIG. 7 is a cross-sectional view showing a modified example of the non-through hole 111, and for convenience, the parts other than the lands 112 arranged on the surface of the substrate 110 are omitted.

  In the present embodiment, the connecting surface 111c of the non-through hole 111 is tapered, that is, the angle of the bottom surface side corner portion 111d (the angle formed between the bottom surface 111b and the connecting surface 111c) is an obtuse angle. An example is shown in which the solder 113 is easily introduced into the non-through hole 111 during printing. On the other hand, in addition to the configuration according to the present embodiment, for example, as shown in FIGS. 8A and 8B, the shape of the upper opening portion 111 a has no corner (not more than a right angle) in the planar direction of the substrate 110. When the shape is a shape (a shape obtained by rounding a square corner in FIG. 8A and a circle in FIG. 8B), the solder 113 can be easily introduced to the corner of the non-through hole 111 during screen printing. That is, the air remaining in the solder 113 can be further reduced. FIG. 8A and FIG. 8B are plan views showing modifications of the non-through hole 111, and for the sake of convenience, the parts other than the land 112 arranged on the surface of the substrate 110 are omitted.

  Further, as shown in the present embodiment, in the configuration in which the solder 113 is disposed on the land 112 using the screen printing method, the GND pattern and the land 112 are arranged around the land 112 on the electronic component placement surface of the substrate 110. At least one of a wiring pattern that is electrically connected to each other, a dummy wiring pattern that does not perform an electrical connection function, and a silk pattern may be provided. For example, in FIGS. 9A and 9B, not only the resist 114 but also the GND pattern 115 and the silk pattern 116 are laminated and disposed at least around the connection portion 112 a with the surface mounting portion 132 a in the land 112. . In addition, the GND pattern 115 can be formed in the same process (for example, etching copper foil) as the connection part 112a with the surface mounting part 132a in the land 112. The silk pattern 116 can be formed together with other silk patterns (such as production lot printing) after the resist 114 is formed. If such a configuration is adopted, the thickness of the protective portion formed around the land 112 can be increased, so that it is disposed on the land 112 (particularly, the connection portion 112a with the surface mounting portion 132a) by screen printing. The thickness of the solder 113 can be increased. That is, connection reliability (lifetime) can be improved. 9A and 9B are diagrams showing a modification of the substrate 110, where FIG. 9A is a plan view around the land 112, and FIG. 9B is a cross-sectional view taken along line BB in FIG. In FIG. 9A, the parts other than the lands 112 arranged on the surface of the substrate 110 are omitted. FIG. 9B also shows a state where the solder 113 is not disposed for convenience.

  Further, when the solder 113 is arranged by the screen printing method, as shown in FIG. 10B, as shown in FIG. 10B, the opening 151 of the screen 150 provided corresponding to the land 112 as shown in FIG. The portion corresponding to the insertion mounting portion 132b with respect to the land 112 in the planar direction of the substrate 110 in the mounting state is preferably made narrower than the other portions, and the paste solder 113 is printed using this screen 150. When the solder 113 is printed using such a screen 150, as shown in FIG. 11A, the solder thickness around the portion where the insertion mounting portion 132b is inserted in the non-through hole 111 can be reduced. Therefore, even if the insertion mounting portion 132b is inserted, as shown in FIG. 11B, the protrusion of the solder 113 to the periphery of the land 112 (for example, on the resist 114) due to the displacement of the insertion mounting portion 132b is reduced or prevented. be able to. That is, bridges can be reduced. 10A and 10B are diagrams illustrating an example of the screen printing method. FIG. 10A is a plan view of the screen 150, and FIG. 10B is a schematic diagram illustrating a positional relationship between the land 112 after mounting and the insertion mounting portion 132b. FIG. 11 is a schematic cross-sectional view showing the effect of the screen 150 shown in FIG. 10A, where FIG. 11A shows the time of printing, and FIG. 11B shows the time of mounting.

(Fourth embodiment)
Next, 4th Embodiment of this invention is described based on Fig.12 (a), (b). 12A and 12B are diagrams showing the main part of the mounting structure of the electronic component 130 according to the fourth embodiment, and FIG. 12A is a front view showing a schematic configuration of the electronic component 130 (connector 130) (viewed from the short side direction). Side views) and (b) are plan views of the periphery of the land 112 of the substrate 110. FIG. In FIG. 12B, for the sake of convenience, the parts other than the land 112 arranged on the surface of the substrate 110 are omitted.

  Since the mounting structure of the electronic component 130 (connector 130) in the fourth embodiment is often the same as that of the first to third embodiments, the detailed description of the common parts will be omitted below, and different parts will be emphasized. Explained.

  In this embodiment, as shown to Fig.12 (a), the branch terminal 132 and the surface mount type terminal 133 are included as a plurality of terminals, and the branch terminal 132 and the surface mount type terminal 133 serve as the main body. The electronic component 130 (connector 130) is alternately arranged in the longitudinal direction with respect to the housing 131. In addition, since the non-through hole 111 is not formed in the part corresponding to the surface mounting type terminal 133 of the substrate 110, and the land 112 is formed corresponding to the surface mounting type terminal 133 on the connector arrangement surface, FIG. As shown in FIG. 12B, every other non-through hole 111 is provided for the lands 112 arranged in a row in the longitudinal direction of the electronic component 130.

  As described above, since every other branch terminal 132 is arranged, the connection reliability can be improved as compared with the conventional mounting structure having no branch terminal 132. In addition, since only some of the plurality of terminals are the branch terminals 132b, the number of non-through holes 111 formed in the substrate 110 can be reduced as compared with the configuration in which all of the terminals are branch terminals 132b. it can. Therefore, the degree of freedom of the wiring pattern formed on the substrate 110 can be improved.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described with reference to FIG. FIG. 13 is a plan view showing a schematic configuration of the substrate 110 which is a main part of the mounting structure of the electronic component 130 according to the fifth embodiment. In FIG. 13, for the sake of convenience, parts other than the lands 112 arranged on the surface of the substrate 110 are omitted.

  Since the mounting structure of the electronic component 130 (connector 130) in the fifth embodiment is often the same as that of the first and third embodiments, detailed description of the common parts will be omitted, and different parts will be emphasized. Explained.

  In the present embodiment, the plurality of terminals are all branched terminals 132, and in the configuration arranged in the longitudinal direction with respect to the housing 131 of the electronic component 130 (connector 130), as shown in FIG. The width (W1) of the non-through hole 111 corresponding to the lands 112 at both ends is set to be larger than the width (W1) of the non-through hole 111 corresponding to the land 112 in the center region sandwiched between both ends. Features. Note that the number of the lands 112 positioned at one end is not limited to one. In FIG. 13, the region corresponding to the two lands 112 is the end.

  Also in the present embodiment, as in the first embodiment, the housing 131 of the connector 130 has a shape that is long in one direction in the plane direction of the substrate 110, and a plurality of terminals 132 are arranged along the longitudinal direction. Adopted. Therefore, as shown in the first embodiment, the amount of deformation of the substrate 110 (housing 131) that occurs during reflow increases toward the end in the longitudinal direction. That is, in the connection between the terminal 132 and the corresponding land 112, the positional deviation between the terminal 132 and the land 112 is larger at the end than in the central region.

  However, according to the configuration according to the present embodiment, since the non-through hole 111 at the end is larger than the non-through hole 111 in the central region, the mounting insertion portion 132b is placed in the non-through hole 111 even if a positional deviation occurs. Can be kept on. Thus, since the tolerance | permissible amount of position shift is large, connection reliability can be ensured.

  Further, since the non-through hole 111 at the end is large, the amount of solder in the end land 112 that is easily affected by temperature change (cold thermal shock) during use can be increased. That is, connection reliability (lifetime) can be improved.

(Sixth embodiment)
Next, 6th Embodiment of this invention is described based on Fig.14 (a)-(c). 14A and 14B are diagrams showing a schematic configuration of the mounting structure of the electronic component 130 according to the sixth embodiment, in which FIG. 14A is a plan view, FIG. 14B is a side view showing the configuration of the branch terminal 132, and FIG. These are the top views of a comparison object (1st Embodiment). In FIGS. 14A and 14C, for the sake of convenience, the parts other than the lands 112 arranged on the surface of the substrate 110 are omitted.

  Since the mounting structure of the electronic component 130 (connector 130) in the sixth embodiment is often the same as that of the first, third, and fifth embodiments, the detailed description of the common parts is omitted below and is different. The part will be explained with emphasis.

  In the present embodiment, the plurality of terminals are all branched terminals 132, and in the configuration arranged in the longitudinal direction with respect to the housing 131 of the electronic component 130 (connector 130), as shown in FIG. All the lands 112 are characterized in that the side closer to the housing 131 is a connection part 112a to the surface mounting part 132a and the side far from the housing 131 is a connection part 112b to the insertion mounting part 132b. For example, as shown in FIG. 14B, the branch terminal 132 mounted on the land 112 having such an arrangement extends in a direction in which the surface mounting portion 132 a moves away from the connector housing 131 and is inserted at the tip thereof. The thing of the shape where the mounting part 132b was connected is employable.

  With such a configuration, the opposing distance between the housing 131 and the non-through hole 111 (connecting portion to the insertion mounting portion 132b) in the plane direction of the substrate 110 is set as shown in FIG. The configuration shown in the embodiment (the side closer to the housing 131 is the connection part 112b with the insertion mounting part 132b and the side farther from the housing 131 can be longer than the connection part 112a with the surface mounting part 132a). . Therefore, the insertion mounting portion 132b with respect to stress in the rotation direction with respect to the electronic component 130 (connector 130) (stress indicated by a white arrow in FIG. 14A, which is substantially perpendicular to the longitudinal direction and opposite to both ends). And the land 112 (112a) can be effectively reduced in positional deviation.

  According to the configuration shown in FIG. 14C, the facing distance between the housing 131 and the non-through hole 111 (connection portion between the insertion mounting portion 132b) can be shortened as compared with the configuration according to the present embodiment. it can. Therefore, the positional deviation between the insertion mounting portion 132b and the land 112 (112a) can be effectively reduced with respect to the stress in the longitudinal direction on the electronic component 130.

  Further, as shown in FIG. 15A, the non-through holes 111 shown in FIG. 14A and the non-through holes 111 shown in FIG. 14C may be alternately provided along the longitudinal direction. . According to this, an effect equivalent to the effect of the configuration shown in FIG. 14A and the configuration shown in FIG. 14C is shown (not as much as a single configuration, but the position shifts with respect to each stress. Can be reduced). In addition, since the positions of the non-through holes 111 alternate on the side closer to and far from the housing 131, the size (width) of the non-through holes 111 is increased as shown in FIG. Along with this, the connection part 112b with the insertion mounting part 132b can be enlarged). When this configuration is adopted, the allowable amount of positional deviation between the insertion mounting portion 132b and the land 112 (112a) can be further increased. FIG. 15A is a plan view showing a modification, and FIG. 15B is a plan view in which a part of the plurality of lands 112 is enlarged in FIG. In FIG. 15A, for the sake of convenience, parts other than the land 112 arranged on the surface of the substrate 110 are omitted.

(Seventh embodiment)
Next, a seventh embodiment of the present invention will be described based on FIGS. 16 (a) and 16 (b). 16A and 16B are diagrams showing a schematic configuration of the mounting structure of the electronic component 130 according to the seventh embodiment. FIG. 16A is a cross-sectional view, and FIG. 16B is a plan view around the land 112.

  Since the mounting structure of the electronic component 130 (connector 130) in the seventh embodiment is often the same as that of the above-described embodiments, detailed description of the common parts will be omitted, and different parts will be mainly described below. To do.

  In each embodiment mentioned above, the example in which the insertion mounting part 132b is electrically connected only to the land 112 (the wall surface of the non-through hole 111 and the surrounding connection part 112b) was shown. On the other hand, in the present embodiment, the substrate 110 is configured as a multilayer substrate in which wiring patterns including lands 112 are stacked in multiple layers on the base material, and the insertion mounting portion 132b is disposed inside the base material. It is characterized in that it is also electrically connected to the wiring pattern. Specifically, as shown in FIG. 16A, in the substrate 110, the through hole 111 is formed with the inner layer pattern 117 as a wiring pattern on the bottom surface without the land 112 being arranged, and the insertion mounting portion 132b. Is inserted into the through hole 111 and electrically connected to the inner layer pattern 117 via the land 112 and the solder 113 provided on the wall surface in a state where the land 112 is connected via the solder 113.

  With such a configuration, the non-through hole 111 and the insertion mounting portion 132b can serve as a connection via in which a conductive member is filled in the via hole. Therefore, as shown in FIG. 16B, the connection via 118 and the wiring pattern 119 extending from the land 112 to connect to the connection via 118 can be eliminated on the electronic component placement surface of the substrate 110. (In FIG. 16B, in order to show the difference, the connection via 118 and the wiring pattern 119 which are unnecessary portions are indicated by broken lines). Therefore, the mounting efficiency of the electronic components 21 and 130 can be improved. In addition, the degree of freedom of the wiring pattern on the substrate 110 can be improved. Furthermore, a signal can be directly exchanged between the terminal 132 of the electronic component 130 (connector 130) and the inner layer pattern 117, and since it is the terminal 132, it is possible to cope with a large current.

(Eighth embodiment)
Next, an eighth embodiment of the present invention will be described with reference to FIG. FIG. 17 is an enlarged cross-sectional view of a connection portion between the insertion mounting portion 132b and the land 112, which is a main portion of the mounting structure of the electronic component 130 according to the eighth embodiment.

  Since the mounting structure of the electronic component 130 (connector 130) in the eighth embodiment is often the same as that of each of the above-described embodiments, detailed description of the common parts will be omitted, and different parts will be mainly described below. To do.

  In each embodiment mentioned above, the example in which one branch terminal 132 has one insertion mounting part 132b was shown. However, the number of insertion mounting portions 132b and surface mounting portions 132b included in one branch terminal 132 is not particularly limited. In the present embodiment, one branch terminal 132 is provided with a plurality of insertion mounting portions 132b, and the plurality of insertion mounting portions 132b are separated from each other in the planar direction of the substrate 110.

  Specifically, as shown in FIG. 17, a plurality of insertion mounting portions 132b (two insertion mounting portions 132b in FIG. 17) are separated from each other in the planar direction of the substrate 110 by a connecting portion 132c made of the same material. Are connected to each other. And it is inserted in the same non-through hole 111.

  With such a configuration, since the connection area by the insertion mounting portion 132b increases, connection reliability can be improved. In addition, air remaining in the solder 113 can easily escape to the outside of the hole during heating (for example, reflow) through a gap between the insertion mounting portions 132b that are separated from each other (solid arrow shown in FIG. 17). Therefore, connection reliability and durability can be further improved in a configuration in which a plurality of insertion mounting portions 132b included in the same branch terminal 132 are inserted into one non-through hole 113. Furthermore, as shown in FIG. 17, when the connecting portion 132c is not in contact with the 113, the air remaining in the solder 113 is more likely to escape out of the hole during heating (for example, reflow). On the other hand, when the connecting portion 132c is in contact with the solder 113, the effect of escaping the air remaining in the solder 113 to the outside of the hole is reduced, but the connection area with the solder 113 is increased as compared with the configuration in which the connecting portion 132c is not in contact. Therefore, connection reliability can be improved.

  In the present embodiment, an example in which a plurality of insertion mounting portions 132b included in the same branch terminal 132 is inserted into the same non-through hole 111 is shown. On the other hand, for example, as shown in FIG. 18 (a), a plurality of insertion mounting portions 132b (two in FIG. 18 (a)) included in the same branched terminal 132 are formed in different one non-through holes 111, respectively. A configuration in which the lands 112 inserted and provided in the plurality of non-through holes 111 are integrated as one land 112 may be employed. With such a configuration, the size of the non-through hole 111 in the planar direction of the substrate 110 (upper opening portion 111a) as shown in FIG. 18 (b), compared to the configuration inserted in the same non-through hole 111. Width) can be reduced. Therefore, the manufacturing cost (particularly when the non-through hole 111 is formed by laser processing) can be reduced. In the configuration shown in FIG. 18A, a plurality of insertion mounting portions 132b are connected by a surface mounting portion 132a. Thus, when at least a part of the surface mounting portion 132a also serves as a function of connecting the insertion mounting portion 132b, the configuration of the branch terminal 132 can be simplified. 18A and 18B are diagrams showing a modification, in which FIG. 18A is a cross-sectional view, and FIG. 18B is a plan view of the land 112.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

  In the present embodiment, the characteristic mounting structure of the present invention has been described using the connector as the electronic component 130. However, the mounting structure described above is not limited to the connector 130 (electronic component 130). If the electronic component has a configuration in which a plurality of terminals are extended from the main body, by adopting the mounting structure described above, an effect similar to or equivalent to the effect shown in the first embodiment or the second embodiment is expected. be able to.

  For example, as shown in FIG. 5, the mounting structure shown in the first embodiment may be applied to an electronic component 120 (a microcomputer, a power transistor, a capacitor, a resistor, etc.) other than the connector 130. In FIG. 5, the electronic component 120 is a microcomputer, reference numeral 121 indicates a main body of the electronic component 120, reference numeral 122 indicates a terminal, reference numeral 122 a indicates a surface mounting portion, and reference numeral 122 b indicates an insertion mounting portion. Although FIG. 5 shows a configuration in which the mounting structure shown in the first embodiment is adopted for the electronic component 120, it goes without saying that the mounting structure shown in the second embodiment can be adopted.

  Further, in the present embodiment, an example in which the electronic component 120 is mounted on the substrate 110 including the back surface portion corresponding to the non-through hole 111 formation portion of the substrate 110 as the circuit board 100 has been shown. However, the circuit board 100 may be configured such that the electronic component 120 is not disposed on the back surface portion corresponding to the non-through hole 111 forming portion of the substrate 110.

  Moreover, in this embodiment, the example by which the edge part by the side mounted in the board | substrate 110 was extended from one surface of the main-body part (housing) 131 of the electronic component (connector) 130 was shown. However, the mounting structure shown in the present embodiment can also be adopted in a configuration in which end portions on the side mounted on the substrate 110 are extended from a plurality of surfaces of the main body 131. For example, even in a configuration in which end portions on the side mounted on the substrate 110 are extended from both opposing surfaces of the main body 131, the terminal 132 (133) extended from each surface is shown in this embodiment. The mounting structure can be adopted.

  In the present embodiment, in the electronic component 130 (120), a surface mounting portion 132a (133a, 122a), which is a mounting portion, and an insertion mounting portion 132b (insertion mounting portion) are provided at the tip portion of the terminal 132 (133, 122). An example in which 122b) is provided is shown. However, it is good also as a structure which has a stress relaxation part between the housing 131 (main-body part 121) and each mounting part. As an example, in FIG. 20, an elastically deformable spring portion 132 d is provided between the mounting portions 132 a and 132 b of the branch terminal 132 and the housing 131. With such a configuration, it is possible to relieve stress (due to deformation of the substrate 110) caused by temperature change during mounting, and to reduce the positional deviation between the terminal 132 and the corresponding land 112. Further, after mounting, the external stress transmitted to the connection portion between the terminal 132 and the land 112 can be reduced, and the connection reliability (lifetime) can be improved. FIG. 20 is a side view showing a modification of the branched terminal 132.

  Further, in the present embodiment, an example in which the width W1 of the upper opening portion 111a of the non-through hole 111 is wider than the width W2 of the bottom surface 111b and the connecting surface 111c is tapered. On the other hand, as shown in FIG. 21, for example, a predetermined range from the distal end of the insertion mounting portion 132b of the branched terminal 132 inserted into the non-through hole 111 may be tapered to reduce the diameter in the distal direction. If comprised in this way, it will become easy to insert the insertion mounting part 132b with respect to the non-through-hole 111 (the direction of the white arrow of FIG. 21). FIG. 21 is a cross-sectional view showing a modification of the branched terminal 132.

FIG. 1 is a side view showing a schematic configuration of the entire electronic component mounting structure. It is a figure which shows schematic structure of the electronic component (connector) for implement | achieving the mounting structure which concerns on 1st Embodiment, (a) is a side view (viewed from the longitudinal direction), (b) is a front view (short side) It is a side view seen from the direction). It is an expanded sectional view around a connection part. It is a front view (side view seen from the transversal direction) which shows schematic structure of the electronic component (connector) which is the principal part of the mounting structure which concerns on 2nd Embodiment. It is a figure which shows schematic structure of the board | substrate which is the principal part of the mounting structure which concerns on 3rd Embodiment, (a) is a top view near land, (b) is sectional drawing which follows the AA line of (a). It is. It is sectional drawing for demonstrating the effect of a non-through hole, (a) is the effect at the time of screen printing, (b) is the effect at the time of mounting, (c) has shown the comparison object on the same conditions. It is sectional drawing which shows the modification of a non-through hole. (A), (b) is a top view which shows the modification of a non-through hole. It is a figure which shows the modification of a board | substrate, (a) is a top view around a land, (b) is sectional drawing which follows the BB line of (a). It is a figure which shows an example of the screen printing method, (a) is a top view of a screen, (b) is a schematic diagram which shows the positional relationship of the land after mounting, and an insertion mounting part. FIGS. 10A and 10B are schematic cross-sectional views showing the effects of the screen shown in FIG. 10A, in which FIG. It is a figure which shows the principal part of the mounting structure of the electronic component which concerns on 4th Embodiment, (a) is a front view (side view seen from the transversal direction) which shows schematic structure of an electronic component (connector), (b) FIG. 3 is a plan view of the periphery of a land on a substrate. It is a top view which shows schematic structure of the board | substrate which is the principal part of the mounting structure of the electronic component which concerns on 5th Embodiment. It is a figure which shows schematic structure of the mounting structure of the electronic component which concerns on 6th Embodiment, (a) is a top view, (b) is a side view which shows the structure of a branched terminal, (c) is a comparison object (1st It is a top view of embodiment. (A) is a top view which shows a modification, (b) is the top view to which some land was expanded in (a). It is a figure which shows schematic structure of the mounting structure of the electronic component which concerns on 7th Embodiment, (a) is sectional drawing, (b) is a top view of a land periphery. It is an expanded sectional view of the connection part of the insertion mounting part and land which is the principal part of the mounting structure of the electronic component which concerns on 8th Embodiment. It is a figure which shows a modification, (a) is sectional drawing, (b) is a top view of a land. It is a schematic sectional drawing which shows the modification of an electronic component. It is a side view which shows the modification of a branched terminal. It is sectional drawing which shows the modification of a branched terminal.

Explanation of symbols

110 ... substrate 111 ... non-through hole 111a ... upper opening part 111b ... bottom surface (hole bottom surface)
111c: Connecting surface 112 ... Land 113 ... Solder 130 ... Connector (electronic component)
131 ... Housing (main body)
132 ... Branch terminal (terminal)
132a... Surface mounting portion 132b... Insertion mounting portion 133... Surface mounting type terminal (terminal)

Claims (19)

An electronic component mounting structure in which an electronic component in which a plurality of terminals extend from a main body is arranged on a substrate, and the terminals and corresponding lands provided on the substrate are electrically connected via solder. Because
As the plurality of terminals, at least branch terminals branched to a surface mounting portion where a connection portion with the land extends along the electronic component placement surface of the substrate and an insertion mounting portion protruding from the surface mounting portion toward the substrate side Including
The substrate has a non-through hole into which the insertion mounting portion is inserted,
The insertion mounting portion is inserted into the non-through hole, and the branch terminal is electrically connected to the corresponding land provided around the non-through hole wall surface of the substrate and the non-through hole opening of the electronic component placement surface. Connected to
In the non-through hole, in the state where the land is provided, the width W1 of the upper opening portion in the same direction along the electronic component placement surface of the substrate is larger than the width W2 of the hole bottom surface, and the upper opening portion and the hole A mounting structure for an electronic component, wherein a connecting surface connecting the bottom surface is tapered.   2. The electron according to claim 1, wherein the non-through hole is set such that the width W1 and a depth D from the upper opening portion to the bottom surface of the hole satisfy a relationship of W1> D. Component mounting structure.   The electronic part according to claim 2, wherein the non-through hole is set so that the width W1, the width W2, and the depth D satisfy a relationship of W1> W2> D. Mounting structure. The substrate is a multilayer substrate in which wiring patterns including the lands are arranged in multiple layers on a base material,
The electronic component mounting structure according to any one of claims 1 to 3, wherein the insertion mounting portion is electrically connected to the wiring pattern disposed inside the base material. A plurality of the insertion mounting portions are provided in one branch terminal,
5. The electronic component mounting structure according to claim 1, wherein the plurality of insertion mounting portions are separated from each other in a planar direction of the substrate.   The electronic component mounting structure according to claim 5, wherein the plurality of insertion mounting portions are inserted into the same non-through hole. The plurality of insertion mounting portions are inserted into one non-through hole different from each other,
7. The electronic component mounting structure according to claim 5, wherein the lands provided in the plurality of non-through holes are integrated as one land.   The electronic component mounting structure according to claim 7, wherein the plurality of insertion mounting portions are connected by the surface mounting portion.   9. The electronic component according to claim 1, wherein the insertion mounting portion is tapered in a height direction so that a predetermined range from the insertion tip is reduced in diameter in the tip direction. Mounting structure.   The electronic component mounting structure according to claim 1, wherein the branch terminal has a stress relaxation portion between the main body portion, the surface mounting portion, and the insertion mounting portion. . The main body of the electronic component has a shape that is long in one direction with respect to the electronic component placement surface,
As the plurality of terminals, together with the branched terminal, a connection portion with the land includes a surface mount type terminal along the electronic component placement surface,
11. The electronic component mounting structure according to claim 1, wherein the branched terminals and the surface-mounted terminals are alternately arranged in the longitudinal direction with respect to the main body portion. The main body of the electronic component has a shape that is long in one direction with respect to the electronic component placement surface,
11. The electronic component mounting structure according to claim 1, wherein all of the plurality of terminals are the branched terminals, and are arranged in a longitudinal direction with respect to the main body portion.   In the longitudinal direction, the width W1 of the non-through hole corresponding to the land at both ends is larger than the width W1 of the non-through hole corresponding to the land in a central region sandwiched between the both ends. The electronic component mounting structure according to claim 12, wherein:   All the lands connected to the branched terminals are connected to the surface mounting portion on the side closer to the main body portion, and are connected to the insertion mounting portion on the side far from the main body portion. 14. The electronic component mounting structure according to claim 12, wherein the electronic component mounting structure is a first land.   All of the lands connected to the branched terminals are connected to the insertion mounting portion on the side closer to the main body, and the connection portion to the surface mounting portion is on the side far from the main body. 14. The electronic component mounting structure according to claim 12, wherein the second land is a second land.   As the land to be connected to the branched terminal, the side closer to the main body portion is a connection portion with the surface mounting portion, and the side far from the main body portion is a connection portion with the insertion mounting portion. The first land and the second land in which the side closer to the main body is the connection site with the insertion mounting portion, and the side far from the main body is the connection land with the surface mounting portion 14. The electronic component mounting structure according to claim 12 or 13, wherein the structure is provided alternately along the longitudinal direction.   A GND pattern, a wiring pattern electrically connected to the land, a dummy wiring pattern that does not perform an electrical connection function, around the land connected to the branch terminal on the electronic component placement surface of the substrate, and The electronic component mounting structure according to any one of claims 1 to 16, wherein at least one of a silk pattern is disposed.   The electronic component mounting structure according to claim 1, wherein the land disposed in the non-through hole is formed by plating.   The electronic component mounting structure according to claim 1, wherein the electronic component is a connector.

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