Patent ID: 12256491

DESCRIPTION OF EMBODIMENTS

Embodiments of the present disclosure will be described in the following order with reference to the drawings. Note that, in all the drawings in the following embodiments, the same or corresponding parts are denoted by the same reference signs.1 First Embodiment (Example of Electronic Component Mounted Body)2 Second Embodiment (Example of Electronic Component Mounted Body)3 Third Embodiment (Example of Electronic Component Mounted Body)4 Modifications5 Application Examples

1 First Embodiment

[Configuration of Electronic Component Mounted Body]

FIG.1Ais a plan view depicting an example of the configuration of an electronic component mounted body1according to a first embodiment of the present disclosure.FIG.1Bis a sectional view taken along line IB-IB ofFIG.1A. The electronic component mounted body1includes an electronic component mounting substrate10, an electronic component20, and solders21A and21B. The electronic component mounted body1may be an MID (Molded Interconnect Device).

(Electronic Component)

The electronic component20has a connection terminal (first connection terminal)20A and a connection terminal (second connection terminal)20B. The connection terminal20A and the connection terminal20B have different polarities. For example, the connection terminal20A is a positive terminal, and the connection terminal20B is a negative terminal. The electronic component may have a chip-like shape or may have a shape other than the chip-like shape. As the electronic component, there may be mentioned, for example, a capacitor a battery, a resistor, a coil, a diode, a transistor, or a switch, but the electronic component is not limited to these electronic components. InFIG.1A, an example in which the electronic component20is a chip-like capacitor is depicted.

(Electronic Component Mounting Substrate)

FIG.2is a plan view depicting an example of the configuration of an electronic component mounting substrate10.FIG.3Ais a plan view depicting, in an enlarged manner a part ofFIG.2.FIG.3Bis a sectional view taken along line IIIB-IIIB ofFIG.3A. The electronic component mounting substrate10includes a substrate main body11, a pair of connection sections12A and12B, and conductor patterns13A and13B.

(Substrate Main Body)

The substrate main body11supports the electronic component20. The substrate main body11includes a polymeric resin on at least a surface thereof. The substrate main body11may be a resin molded body including a polymeric resin. The resin molded body may be a housing used for an electronic apparatus or the like. While an example in which the substrate main body11is shapes like a flat plate is depicted inFIGS.1A,1B,2, and3, the shape of the substrate main body11is not limited to this. The substrate main body11may be a molded body having a three-dimensional structure (for example, an injection molded body having a three-dimensional structure).

(Connection Section)

The connection sections12A and12B are what are generally called lands. The connection sections12A and12B are provided on the substrate main body11. The electronic component20is connected to the connection sections12A and12B. Specifically, the connection terminal20A of the electronic component20is connected to the connection section12A, and the connection terminal20B of the electronic component20is connected to the connection section12B. The connection section12A and the connection terminal20B are fixed by the solder21A, and the connection section12B and the connection terminal20B are fixed by the solder21B. The connection sections12A and12B have a width similar to that of the conductor patterns13A and13B. The connection sections12A and12B have a rectangular shape. It is to be noted, however, that the shape of the connection sections12A and12B is not limited to the rectangular shape and may be a circular shape, an elliptic shape, or a polygonal shape other than the rectangular shape, or the like.

As depicted inFIG.3B, the connection sections12A and12B include a high-wettability metallic layer (first metallic layer)14and a low-wettability metallic layer (second metallic layer)15. The wettability of the low-wettability metallic layer15is lower than the wettability of the high-wettability metallic layer14. Therefore, a solder is less likely to spread on the low-wettability metallic layer15than on the high-wettability metallic layer14. The low-wettability metallic layer15is provided under the high-wettability metallic layer14. The low-wettability metallic layer15is provided on a surface of the substrate main body11. The high-wettability metallic layer14includes, for example, gold (Au), a gold alloy, silver (Ag), or a silver alloy. The low-wettability metallic layer15includes, for example, nickel (Ni), a nickel alloy, copper (Cu), or a copper alloy.

The pair of connection sections12A and12B are disposed to face each other with a prescribed distance therebetween. As depicted inFIGS.2and3A, the connection section12A has a high-wettability region (first region)14R and a low-wettability region (second region)15R on the side of the surface of the substrate main body11. The connection section12B also has another high-wettability region14R and another low-wettability region15R on the side of the surface of the substrate main body11.

(High-Wettability Region)

The contact angle of the solder on the high-wettability region14R is preferably substantially 0 degrees. When the contact angle of the solder is substantially 0 degrees, a function excellent as the high-wettability region14R can be obtained. Here, the substantially 0 degrees include 0 degrees. The contact angle of the solder on the high-wettability region14R is measured as follows. A solder (solder composition: SAC305) is applied to the high-wettability region14R such that the solder application diameter ϕ is 0.3 mm, and, after melting the solder by reflow, the contact angle of the solder is measured.

The high-wettability region14R is a region in which a surface of the high-wettability metallic layer14is exposed. As depicted inFIG.4, the high-wettability region14R has a region RAand a region RB. The region RAand the region RBare connected to each other. The region RAand the region RB, or the high-wettability region14R, is a region in which the solders21A and21B are provided. In the first embodiment, a case where the solders21A and21B are provided in the region RBis described, but the solders21A and21B may not be provided in the region RB.

The connection terminal20A of the electronic component20is connected to the region RAof the connection section12A, and the connection terminal20B of the electronic component20is connected to the region RAof the connection section12B. The connection terminal20A of the electronic component20is fixed to the region RAof the connection section12A by the solder21A, and the connection terminal20B of the electronic component20is fixed to the region RAof the connection section12B by the solder21B. The region RAand the region RBhave, for example, a rectangular shape. The region RBmay have a linear shape.

The region RAof the connection section12A is provided on the side of the connection section12A which is opposed to the connection section12B. The region RAof the connection section12B is provided on the side of the connection section12B which is opposed to the connection section12A. The region RBof the connection section12A is provided along opposed peripheral edge portions (specifically, two opposed sides) of the connection section12A. The region RBof the connection section12B is provided along opposed peripheral edge portions (specifically, two opposed sides) of the connection section12B.

(Low-Wettability Region)

The contact angle of the solder on the low-wettability region15R is preferably equal to or more than 55 degrees. When the contact angle of the solder is substantially equal to or more than 55 degrees, a function excellent as the low-wettability region15R can be obtained. The contact angle of the solder on the low-wettability region15R is measured similarly to the contact angle of the solder on the high-wettability region14R.

The low-wettability region15R is a region in which a surface of the low-wettability metallic layer15is exposed from the high-wettability metallic layer14. The low-wettability regions15R of the connection sections12A and12B are opposed to each other. The low-wettability region15R of the connection section12A is opposed to the connection terminal20A of the electronic component20. The low-wettability region15R of the connection section12B is opposed to the connection terminal20B of the electronic component20.

In a manufacturing process, the low-wettability regions15R prevent wetting spreading of the molten solders21A and21B and restrict the application positions of the solders21A and21B to fall within the high-wettability region14R. The low-wettability regions15R are regions in which the solders21A and21B are not provided, or regions in which the solders21A and21B are rarely provided. The low-wettability region15R is a region in which the surface of the low-wettability metallic layer15is exposed. The wettability of the low-wettability region15R is lower than the wettability of the high-wettability region14R. Therefore, under the wettability on the low-wettability region15R, the solders21A and21B are less likely to spread on the low-wettability region15R than on the high-wettability region14R.

As will be described later, the low-wettability region15R is formed by removing part of the high-wettability metallic layer14provided on the low-wettability metallic layer15. Part of the high-wettability metallic layer14may remain on a surface of the low-wettability metallic region15R. At the surface of the low-wettability metallic region15R, materials of the high-wettability metallic layer14and the low-wettability metallic layer15may form an alloy. In a case where the high-wettability metallic layer14contains gold (Au), the Au weight concentration percentage in the low-wettability region15R is preferably equal to or less than 20%. When the Au weight concentration percentage is equal to or less than 20%, the wettability of the solders21A and21B in a molten state can be made sufficiently low. Therefore, a function sufficient as the low-wettability region15R can be obtained.

The Au weight concentration percentage can be obtained by component analysis of the low-wettability region15R by SEM-EDX (scanning electron microscope SU3500, made by Hitachi High-Tech Corporation: acceleration voltage of 15 kV).

As depicted inFIG.4, the low-wettability region15R has a region RCand a region RD. The region RCand the region RDare connected to each other. The region RChas, for example, a rectangular shape. The region RDhas, for example, a linear shape such as a rectilinear shape. InFIG.4, an example in which the region RChas a rectilinear shape is depicted. The region RCis a spaced region that projects from the region RDtoward the high-wettability region14R (specifically, the region RAof the high-wettability region14R) and is provided to be spaced from the opposed peripheral edge portions (specifically, the two opposed sides) of each of the connection sections12A and12B. Regions RBare provided on both sides of the region RCin a direction orthogonal to a projecting direction of the region RC.

When the solders21A and21B are applied, the region RCbecomes a region in which the application positions and the applying amounts of the solders21A and21B are allowed. In addition, when the applied solders21A and21B are melted, the region RCrestricts the positions of the solders21A and21B. A width WC(seeFIGS.3A and3B) of the region RCis preferably set such that the positional deviation and amount (size) of the applied solders21A and21B can be allowed and a desirable amount of solder is left in the region RAwhich is a soldering region. In order that the surface of the substrate main body11is not laser processed at the time of forming the region RC, a width WBof the region RBis preferably set in consideration of the positional accuracy of the laser processing.

The region RDis a region that stops wetting spreading of the solders21A and21B at the time of melting of the solders21A and21B in the manufacturing process. The region RDis an extension region extended to the opposite peripheral edge portions (specifically, the two opposed sides) of each of the connection sections12A and12B. The region RDof the connection section12A is provided on the depth side relative to the region RCas viewed from the connection terminal20A of the electronic component20. The region RDof the connection section12B is provided on the depth side relative to the region RCas viewed from the connection terminal20B of the electronic component20.

A width WDof the region RDis preferably equal to or more than a minimum spot diameter of laser light but equal to or less than 15 μm, more preferably substantially equal to the minimum spot diameter of laser light. If the width WDof the region RDis less than the minimum spot diameter of laser light, it may be difficult to form the region RDby laser processing. On the other hand, when the width WDof the region RDis equal to or less than 15 μm, a size of laser processed regions16R1and16R2formed on the surface of the substrate main body11by laser processing in a forming step of the connection sections12A and12B can be reduced, so that lowering in the quality of soldering can be further prevented. When the width WDof the region RDis on the order of the minimum spot diameter of laser light, the size of the laser processed regions16R1and16R2formed on the surface of the substrate main body11by laser processing can be minimized. Therefore, lowering in the quality of soldering can be particularly prevented. The minimum spot diameter of laser light depends on the kind of the laser processing apparatus and is, for example, approximately 25 μm.

(Laser Processed Region)

The laser processed regions16R1and16R2are formed by laser processing in the forming step of the connection sections12A and12B. The laser processed regions16R1and16R2may not be provided, and, since it is difficult to laser process only the range of the region RDaccurately, it is preferable that the laser processed regions16R1and16R2be provided. The laser processed region16R1is provided adjacent to one end of the region RD, and the laser processed region16R1is provided adjacent to the other end of the region RD. Peripheral edges of each of the connection sections12A and12B are located at the boundary between the laser processed region16R1and the region RD. In addition, peripheral edges of each of the connection sections12A and12B are located at the boundary between the laser processed region16R2and the region RD.

A width WEof the laser processed regions16R1and16R2in a projecting direction from the peripheral edge portions of each of the connection sections12A and12B is preferably set according to the processing position accuracy of laser. The width WEof the laser processed regions16R1and16R2may be equal to the width WBof the region RB(WE=WE).

(Conductor Pattern)

The conductor patterns13A and13B connect the electronic component20and other electronic components. The conductor patterns13A and13B are provided on the surface of the substrate main body11. The conductor patterns13A and13B extend from the connection sections12A and12B, respectively. The conductor patterns13A and13B are what are generally called wires and have a linear shape.

The conductor patterns13A and13B may each include a high-wettability metallic layer14and a low-wettability metallic layer15, like the connection sections12A and12B. The conductor patterns13A and13B may be integral with the connection sections12A and12B, respectively.

(Solder)

The solder21A fixes the electronic component20to the connection section12A. Specifically, the solder21A fixes the connection terminal20A of the electronic component20to the high-wettability region14R of the connection section12A. The solder21B fixes the electronic component20to the connection section12B. Specifically, the solder21B fixes the connection terminal20B of the electronic component20to the high-wettability region14R of the connection section12B. The solder21A is provided in the high-wettability region14R of the connection section12A. The solder21B is provided in the high-wettability region14R of the connection section12B. The solders21A and21B are, for example, solder pastes.

[Method of Manufacturing Electronic Component Mounted Body]

An example of a method of manufacturing the electronic component mounted body according to the first embodiment of the present disclosure will be described below with reference toFIGS.5A to5CandFIGS.6A to6C. Note that, inFIGS.5A to5C, a position P1indicates a peripheral edge position of the low-wettability region15R on the side far from the connection terminal20A of the electronic component20. In addition, inFIGS.6A to6C, a position P2indicates a peripheral edge position of the low-wettability region15R on the side near the connection terminal20A of the electronic component20.

First, a plurality of linear conductor patterns is formed on the surface of the substrate main body11. The conductor pattern is a laminate of a low-wettability metallic layer15and a high-wettability metallic layer14provided on the low-wettability metallic layer15. Next, an end part of the conductor pattern forming each of the connection sections12A and12B among the plurality of conductor patterns is laser processed, and part of the high-wettability metallic layer14is removed to expose the surface of the low-wettability metallic layer15having lower wettability than the high-wettability metallic layer14. As a result, the connection sections12A and12B having the high-wettability region14R in which the high-wettability metallic layer14is exposed and the low-wettability region15R in which the low-wettability metallic layer15is exposed are formed on the electronic component mounting substrate10.

Note that, in the case where the region RDof the low-wettability metallic layer15is formed by laser processing, it is preferable to form laser processed regions16R1and16R2by laser processing to a position exceeding both long sides of the conductor pattern, namely, to a position outside of the conductor pattern (the high-wettability metallic layer14and the low-wettability metallic layer15). As a result, the region RDcan be formed to positions of both long sides of the conductor pattern, even in the case where deviation from an ideal laser processing position is generated due to a limit of laser processing accuracy. Therefore, occurrence of defective formation of the region RDcan be prevented.

Next, as depicted inFIGS.5A to5C, the solders21A and21B are applied respectively to the connection sections12A and12B, and thereafter, the connection terminal20A and the connection terminal20B of the electronic component20are placed respectively on the solders21A and21B. In this instance, the solder21A is applied to a position on the side of the connection terminal20A of the electronic component20relative to the position P1. In addition, the solder21B is applied to a position on the side of the connection terminal20B of the electronic component20relative to the position P1.

Subsequently, the solders21A and21B are melted by heating, for example, in a reflow furnace. The region RDcan prevent the molten solders21A and21B from wetting and spreading to the conductor patterns13A and13B beyond the position P1. In addition, as depicted inFIGS.6A to6C, the region RC keeps the molten solders21A and21B remaining closer to the side of the electronic component20relative to the position P2, and the positions of the solders21A and21B are restricted. Note that, inFIGS.6A to6C, illustration of the connection terminal20A is omitted. The method for melting the solders21A and21B by heating is not limited to the reflow furnace, and local heating by irradiation with laser light or other heating methods may be adopted.

When the solder21A or21B is melted, the molten solder21A or21B is collected in the region RA, due to the difference in surface tension of the molten solder21A or21B caused by the size difference between the region RAand the region RB. While the molten solders21A and21B wet and spread into the region RB, the molten solders21A and21B wetting and spreading into the region RBare sufficiently small in height. Therefore, most of the applied solders21A and21B can be kept remaining in the region RA. In the abovementioned manner, the desired electronic component mounted body1can be obtained.

Advantageous Effects

As described above, in the electronic component mounted body1according to the first embodiment, the low-wettability region15R has the region RDextended to the opposed peripheral edge portions (specifically, the two opposed sides) of each of the connection sections12A and12B, and the region RCthat projects from the region RDtoward the high-wettability region14R and is provided to be spaced from the opposed peripheral edge portions (specifically, the two opposed sides) of each of the connection sections12A and12B. As a result, (1) at the time of forming the low-wettability region15R by laser processing, even in the case where deviation from an ideal laser processing position is generated due to a limit of laser processing accuracy, a region in which the surface of the substrate main body11is processed can be reduced. Therefore, at the time of applying the solders21A and21B such as solder pastes, a solvent component including a flux can be prevented from flowing into the laser processing region by capillary phenomenon. (2) In addition, even in the case where deviation is generated in the application positions of the solders21A and21B such as solder pastes, most of the molten solders21A and21B can be kept remaining in the region RAby the region RCof the low-wettability region15R (seeFIGS.5A to5CandFIGS.6A to6C). Therefore, an allowable range for the application position deviation of the solders21A and21B can be widened. As a result of (1) and (2) above, lowering in the quality of soldering can be prevented.

In addition, in the manufacturing process, the region RCof the low-wettability region15R can prevent the wetting and spreading of the molten solders21A and21B, and with the presence of the region RC, it is possible to supply a suitable amount of solder to the soldering region RAaccording to the shape and size and the like of the electronic component20. Therefore, a favorable filet shape can be formed, and shock resistance of the electronic component mounted body1can be enhanced. Accordingly, long-term reliability of the electronic component mounted body1can be enhanced.

In the case of only surface layer wiring, wetting and spreading of solder cannot be prevented, so that reduction in the pitch of the connection terminals of the electronic component and reduction in size of the electronic component are difficult to be achieved. On the other hand, in the electronic component mounted body1according to the first embodiment, the positions and amounts of the molten solders21A and21B can be restricted by the low-wettability region15R, so that reduction in the pitch of the connection terminals20A,20B of the electronic component20and reduction in size of the electronic component20are possible. Therefore, the electronic component mounted body1can be enhanced in density.

2 Second Embodiment

[Configuration of Electronic Component Mounted Body]

FIG.7Ais a plan view depicting an example of a configuration of an electronic component mounted body101according to a second embodiment of the present disclosure.FIG.7Bis a plan view depicting an example of a configuration of an electronic component mounting substrate110. The electronic component mounted body101differs from the electronic component mounted body1according to the first embodiment in that the electronic component mounting substrate110includes connection sections112A and112B in place of the connection sections12A and12B.

The connection sections112A and112B each have a high-wettability region14R and a pair of low-wettability regions15R. Widths of the connection sections112A and112B are wider than the widths of the conductor patterns13A and13B, respectively. As a result, the spot of laser light to be used for melting the solders21A and21B can be accommodated in the connection sections112A and112B. Therefore, at the time of locally heating the solders21A and21B by irradiation with laser light, a situation in which the spot of the laser light gets out of the connection sections12A and12B and is applied directly to the surface of the substrate main body11can be prevented. Therefore, a situation in which resin contained in the surface of the substrate main body11is melted and the quality of soldering is lowered can be prevented.

FIG.8is a plan view depicting an example of each region of the connection section112A. The connection section112A has projecting sections112A1and112A2projecting relative to both long sides of the conductor pattern13B. The two low-wettability regions15R are provided on the projecting sections112A1and112A2, respectively. The high-wettability region14R is provided between the two low-wettability regions15R. The two low-wettability regions15R face each other, with the high-wettability region14R interposed therebetween. The connection section112B has each region similarly to the connection section112A.

In the electronic component mounted body101having the abovementioned configuration, the connection terminals20A and20B of the electronic component20are connected respectively to the connection sections112A and112B in the following manner. The connection terminal20A of the electronic component20and the solder21A are disposed in the high-wettability region14R of the connection section112A, and the connection terminal20B of the electronic component20and the solder21B are disposed in the high-wettability region14R of the connection section112B. The solders21A and21B are melted by irradiation with laser light and are solidified.

Advantageous Effects

FIG.9Ais a plan view depicting a configuration of an electronic component mounted body201according to Reference Example 1. The electronic component mounted body201differs from the electronic component mounted body101according to the second embodiment in that each width of connection sections212A and212B is substantially the same as the width of the conductor patterns13A and13B and that the connection sections212A and212B do not have the two low-wettability regions15R.

In the electronic component mounted body201having the abovementioned configuration, at the time of heating the solders21A and21B by laser light, in the manufacturing process, a spot220of the laser light may get out of the connection sections112A and112B, as depicted inFIG.9A, and the laser light may be applied directly to a ground resin, so that the resin contained in the substrate main body11may be melted.

FIG.9Bis a plan view depicting a configuration of an electronic component mounted body202according to Reference Example 2. In the electronic component mounted body202, for preventing the abovementioned melting of the resin, the size of the connection sections212A and212B is enlarged such that the spot220of laser light falls within the connection sections212A and212B. However, when the size of the connection sections212A and212B is thus enlarged, the molten solders21A and21B wet and spread on the connection sections212A and212B, as depicted inFIG.9B, so that the electronic component20may be moved from a prescribed position due to rotation or the like, and soldering may be difficult to be performed.

In the electronic component mounted body201according to the second embodiment, the projecting sections112A1and112A2are provided, whereby the size of the connection sections212A and212B is enlarged, and the pair of low-wettability regions15R face each other, with the high low-wettability region15R interposed therebetween. Therefore, the spot220of laser light can be prevented from getting out of the connection sections112A and112B, and, in the manufacturing process, the molten solders21A and21B can be restricted from two sides. Accordingly, lowering in the quality of soldering due to melting of the resin can be prevented, and positional deviation of the electronic component20from the prescribed position can be prevented.

3 Third Embodiment

[Configuration of Electronic Component Mounted Body]

FIG.10Ais a plan view depicting an example of a configuration of an electronic component mounted body301according to a third embodiment of the present disclosure.FIG.10Bis a plan view depicting, in an enlarged manner, a part ofFIG.10A. The electronic component mounted body301includes an electronic component mounting substrate310, an electronic component320, and a plurality of solders321. Note that the parts in the third embodiment that are similar to those in the first embodiment above are denoted by the same reference signs as used above, and descriptions thereof are omitted.

(Electronic Component)

The electronic component320has a chip-like shape. The electronic component320includes a plurality of connection terminals320A. Examples of the electronic component include an IC (Integrated Circuit), a CPU (Central Processing Unit), an image sensor, or the like, but the electronic component is not limited to these electronic components. InFIG.10A, an example in which the electronic component320is an IC is depicted.

(Solder)

The solders321are similar to the solders21A and21B in the first embodiment.

(Electronic Component Mounting Substrate)

The electronic component mounting substrate310differs from the electronic component mounting substrate10according to the first embodiment in that it includes a plurality of connection sections12A the number of which accords to the plurality of connection terminals320A included in the electronic component320.

Advantageous Effects

In the electronic component mounted body301according to the third embodiment, the electronic component mounting substrate310includes a plurality of connection terminals320A having a high-wettability region14R and a low-wettability region15R. Therefore, advantageous effects similar to those of the electronic component mounted body1according to the first embodiment can be obtained.

4 Modifications

[Modification 1]

In the abovementioned second embodiment, a case where the connection sections112A and112B have a pair of low-wettability regions15R and where the pair of low-wettability regions15R restrict the high-wettability region14R in such a manner as to interpose the high-wettability region14R therebetween has been described, but the configuration of the connection sections112A and112B is not limited to this. For example, as depicted inFIG.11, the connection sections112A and112B may have one low-wettability region17R having a roughly U-shape, and the one low-wettability region17R may restrict the high-wettability region14R in such a manner as to surround the high-wettability region14R from three directions. Here, the roughly U-shape means a shape when the connection sections112A and112B are seen, in plan view, from a direction perpendicular to a surface of the electronic component mounting substrate110.

A peripheral edge portion of the connection section112A which is on the side facing the connection section112B is not surrounded by the low-wettability region17R and is opened. Similarly, a peripheral edge portion of the connection section112B which is on the side facing the connection section112A is not surrounded by the low-wettability region17R and is opened. A tip of the low-wettability region17R of the connection section112A is extended to a peripheral edge of the connection section112A on the side facing the connection section112B. Similarly, a tip of the low-wettability region17R of the connection section112B is extended to a peripheral edge of the connection section112B on the side facing the connection section112A.

In the electronic component mounted body101having the abovementioned configuration, the molten solders21A and21B can be restricted in the three directions in the manufacturing process, so that the solders21A and21B can be prevented from wetting and spreading on the conductor patterns13A and13B, respectively. As a result, prescribed amounts of the solders21A and21B can be held on the connection sections112A and112B, respectively, so that a favorable filet shape can be formed. Therefore, shock resistance of the electronic component mounted body101can be enhanced. Accordingly, long-term reliability of the electronic component mounted body101can be enhanced. In addition, the electronic component20can be prevented from being positionally deviated in a direction in which the connection sections112A and112B are disposed.

Note that the connection sections112A and112B may each have three low-wettability regions15R, and the three low-wettability regions15R may restrict the high-wettability region14R in such a manner as to surround the high-wettability region14R from three directions.

[Modification 2]

In the abovementioned second embodiment, a case where the two low-wettability regions15R are provided to be spaced from each other in a direction orthogonal to the direction in which the connection sections112A and112B are disposed and where the high-wettability region14R is interposed between these two low-wettability regions15R has been described, but also adoptable is a configuration in which two low-wettability regions15R are provided to be spaced from each other in the direction in which the connection sections112A and112B are disposed and the high-wettability region14R is interposed between these two low-wettability regions15R.

[Modification 3]

In the abovementioned first to third embodiments, a case where the region RDhas a rectilinear shape has been described, but the shape of the region RDis not limited to this and may have an arch shape, a V shape, a polygonal line shape, a tortuous shape, a meandering shape, or the like.

5 Application Examples

Any one of the electronic component mounted bodies1,101, and301according to the first to third embodiments and their modifications may be provided in an electronic apparatus. Examples of the electronic apparatus including any one of the electronic component mounted bodies1,101, and301include personal computers, mobile apparatuses, mobile phones, tablet type computers, display devices, imaging devices, audio apparatuses, game apparatuses, medical apparatuses, industrial equipment, robots, or the like, but these are not limitative.

While the embodiments of the present disclosure and modifications have been described specifically, the present disclosure is not limited to the above embodiments and modifications and may be variously modified on the basis of the technical thought of the present disclosure.

For example, the configurations, method, steps, shapes, materials, numerical values, and the like mentioned in the above embodiments and modifications are merely examples, and configurations, method, steps, shapes, materials, numerical values, and the like different from these may be used as required.

The configurations, method, steps, shapes, materials, numerical values, and the like of the above embodiments and modifications can be combined with one another insofar as the combination does not depart from the gist of the present disclosure.

In the numerical value ranges described stepwise in the above embodiments and modifications, the upper limit or the lower limit in the numerical value range at a certain stage may be replaced by the upper limit or the lower limit in the numerical value range at other stage.

The material exemplified in the above embodiments and modifications can be used either singly or in combination of two or more, unless specified otherwise.

In addition, the present disclosure may also adopt the following configurations.

(1)

An electronic component mounted body including:a substrate;a connection section provided on the substrate;an electronic component having a terminal connected to the connection section; anda solder that fixes the electronic component to the connection section,in which the connection section hasa first region in which the terminal is fixed by the solder, anda second region lower in wettability than the first region, andthe second region hasan extension region extended to a peripheral edge of the connection section, anda spaced region that projects from the extension region toward the first region and that is provided to be spaced from the peripheral edge.
(2)

The electronic component mounted body as described in (1),in which the connection section hasa first metallic layer, anda second metallic layer that is provided under the first metallic layer and that is lower in wettability than the first metallic layer,the first region includes a region in which a surface of the first metallic layer is exposed, andthe second region includes a region in which a surface of the second metallic layer is exposed.
(3)

The electronic component mounted body as described in (1) or (2), including:a pair of the connection sections,in which the first regions of the pair of the connection sections face each other.
(4)

The electronic component mounted body as described in any one of (1) to (3),in which the connection section has a pair of the second regions, andthe pair of the second regions face each other, with the first region interposed therebetween.
(5)

The electronic component mounted body as described in any one of (1) to (3),in which the second region surrounds the first region from three directions.
(6)

The electronic component mounted body as described in any one of (1) to (4),in which the substrate includes a resin molded body.
(7)

The electronic component mounted body as described in any of (1) to (6),in which a surface of the substrate is provided with a laser processed region adjacent to the extension region.
(8)

The electronic component mounted body as described in any one of (1) to (7), further including:a conductor pattern extended from the connection section.
(9)

An electronic apparatus including:an electronic component mounted body as described in any one of (1) to (8).
(10)

An electronic component mounting substrate including:a substrate; anda connection section provided on the substrate,in which the connection section hasa first region, anda second region lower in wettability than the first region, andthe second region hasan extension region extended to a peripheral edge of the connection section, anda spaced region that projects from the extension region toward the first region and that is provided to be spaced from the peripheral edge.
(11)

A method of manufacturing an electronic component mounted body, the method including:removing part of a first metallic layer by laser processing to expose a second metallic layer lower in wettability than the first metallic layer, thereby forming, on a substrate, a connection section that has a first region in which the first metallic layer is exposed and a second region in which the second metallic layer is exposed,in which the second region hasan extension region extended to a peripheral edge of the connection section, anda spaced region that projects from the extension region toward the first region and that is provided to be spaced from the peripheral edge.
(12)

The method of manufacturing an electronic component mounted body as described in (11),in which, at a time of forming the extension region by the laser processing, the laser processing is performed to a position outside the first metallic layer and the second metallic layer.
(13)

The method of manufacturing an electronic component mounted body as described in (11) or (12),in which a width of the extension region is substantially equal to a spot diameter of laser light to be used in the laser processing.
(14)

The method of manufacturing an electronic component mounted body as described in any of (1) to (13), further including:disposing a connection terminal of an electronic component and a solder in the first region, and melting the solder by irradiation with laser light.
(15)

The method of manufacturing an electronic component mounted body as described in (14),in which a spot of the laser light to be used for melting the solder falls within the connection section.

REFERENCE SIGN LIST

1,101,201,301: Electronic component mounted substrate10,110,210,310: Electronic component mounting substrate11: Substrate main body12A and12B,112A and112B,212A,212B: Connection section13A and13B: Conductor pattern14: High-wettability metallic layer (First conduction layer)15: Low-wettability metallic layer (Second conduction layer)14R: High-wettability region (First region)15R,17R: Low-wettability region (Second region)16R1,16R2: Laser processing region20,320: Electronic component20A,20B,320: Terminal320A: Terminal21A and21B,321: Solder112A1,112A2: Projecting section