Composite Molding Parts

Abstract

To provide a composite molded component that can be miniaturized.SOLUTION: A composite molded component 10 comprises: an internal component 20; a primary molded part 30 covering the internal component 20; and a secondary molded part 40 covering the primary molded part. A through-hole 31 that penetrates to the internal component 20 and an annular rib part 32 that protrudes toward a side of the secondary molded part 40 so as to surround a positioning section 33 on the primary molded part are formed on the primary molded part 30 of the composite molded component 10. At least a portion of the through-hole part 31 and at least a portion of the annular rib 32 are overlapped in a longitudinal direction (arrow A direction) of the secondary molded part 40.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to composite molded parts. [Background technology]

[0002] Vehicles such as automobiles are equipped with wheel speed sensors that measure the rotational speed of the wheels. A device such as that described in Patent Document 1 is known as such a wheel speed sensor. The wheel speed sensor described in Patent Document 1 includes a detection unit including a detection element portion, a holder portion that is a portion that holds the detection unit, and a resin molded portion that serves as a cover that covers the detection unit. The detection element portion is embedded in one end side of the resin molded portion, and a wire harness extends from the other end side of the resin molded portion. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2017-096828 A Summary of the Invention [Problem to be solved by the invention]

[0004] In order to improve the adhesion between the holder part and the resin molded part, a rib may be provided on a part of the holder part that comes into contact with the resin molded part, which requires a space to be provided for the rib.

[0005] In this regard, there has been a strong demand for smaller and lighter automobiles in recent years. There is also a growing demand for smaller composite molded parts, such as wheel speed sensors, in which electrical components are covered with multiple resin parts.

[0006] Therefore, an object of the present invention is to provide a composite molded part that can be made smaller. [Means for solving the problem]

[0007] The composite molded part of the present disclosure comprises an internal part, a primary molded part covering the internal part, and a secondary molded part covering the primary molded part, wherein the primary molded part is formed with a through hole part penetrating to the internal part and an annular rib part protruding toward the secondary molded part so as to surround a positioning location of the primary molded part, and in the longitudinal direction of the secondary molded part, at least a portion of the through hole part and at least a portion of the annular rib part overlap. Effect of the Invention

[0008] According to the present disclosure, it is possible to provide a composite molded part that can be made smaller by shortening the secondary molded portion in the longitudinal direction. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view showing a composite molded part. [Diagram 2] FIG. 2 is a perspective view showing a composite molded part. [Diagram 3] FIG. 3 is a side view showing a composite molded part. [Figure 4] FIG. 4 is a plan view showing a composite molded part. [Diagram 5] FIG. 5 is a cross-sectional view taken along line VV of FIG. [Figure 6] FIG. 6 is a cross-sectional view taken along line VI-VI of FIG. 4, showing the primary molded portion together with the mold. [Figure 7] 7 is a cross-sectional view showing the primary molded portion together with the mold, taken along line VII-VII in FIG. [Figure 8] FIG. 8 is a cross-sectional view showing the primary molded portion together with the mold, taken along the line VIII-VIII in FIG. [Figure 9] FIG. 9 is a plan view showing a primary molded part in the second embodiment. [Figure 10] FIG. 10 is a cross-sectional view showing the primary molded part together with the mold, at a position corresponding to the cross section taken along line VI-VI in FIG. 4 of the third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] [Description of the embodiments of the present disclosure] First, the embodiments of the present disclosure will be listed and described.

[0011] The composite molded part of the present disclosure is as follows.

[0012] (1) A composite molded part comprising an internal part, a primary molded part covering the internal part, and a secondary molded part covering the primary molded part, wherein the primary molded part is formed with a through hole part penetrating to the internal part and an annular rib part protruding towards the secondary molded part so as to surround a positioning location of the primary molded part, and at least a portion of the through hole part and at least a portion of the annular rib part overlap in the longitudinal direction of the secondary molded part.

[0013] According to the present disclosure, since the through hole portion and the annular rib portion at least partially overlap in the longitudinal direction of the secondary molded portion, the secondary molded portion can be shortened in the longitudinal direction, thereby making it possible to reduce the size of the composite molded part as a whole.

[0014] (2) The through hole portion includes a first through hole portion and a second through hole portion, the annular rib portion includes a first annular rib portion, and the first through hole portion and the second through hole portion are located on both sides of the first annular rib portion in a width direction perpendicular to the longitudinal direction. According to the present disclosure, the secondary molded portion can be shortened in the longitudinal direction, and the mold can stably support the internal part during primary molding.

[0015] (3) The annular rib portion includes a second annular rib portion and a third annular rib portion, and the second annular rib portion and the third annular rib portion are located in parallel along the width direction at a position different from the first annular rib portion in the longitudinal direction. According to the present disclosure, the secondary molded portion can be shortened in the longitudinal direction, and the mold can stably support the internal part during primary molding.

[0016] (4) The first through hole portion and the second through hole portion penetrate the internal component at both outer ends in the width direction in a direction exposing both side surfaces of the internal component in the width direction. According to the present disclosure, the mold can also restrict the internal component in the width direction during primary molding.

[0017] (5) The internal component has two lead wires arranged in parallel, and the through hole portion includes a third through hole portion that penetrates to a position where a portion of each of the two lead wires is exposed. According to the present disclosure, the die can stably support the lead wires during primary molding.

[0018] [Details of the embodiment of the present disclosure] Specific examples of the composite molded part of the present disclosure will be described below with reference to the drawings. Note that the present invention is not limited to these examples, but is defined by the claims, and is intended to include all modifications within the meaning and scope of the claims.

[0019] In each drawing, for convenience of explanation, some of the configurations may be exaggerated or simplified. Also, the dimensional ratio of each part may differ from drawing to drawing. Also, "parallel" and "orthogonal" in this specification do not only mean strictly parallel or orthogonal, but also include roughly parallel or orthogonal within the range in which the action and effect of this embodiment can be achieved.

[0020] [Embodiment 1] The composite molded part 10 according to the first embodiment will be described below. Fig. 1 is a perspective view of the composite molded part 10. Fig. 2 is a perspective view of the composite molded part 10 from a different direction than that of Fig. 1. Fig. 3 is a side view of the composite molded part 10. In each of these figures, the secondary molded portion 40 is shown by virtual lines.

[0021] <About composite molded part 10> The composite molded part 10 includes an internal part 20, a primary molded portion 30, and a secondary molded portion 40. The composite molded part 10 is used, for example, to measure the rotational speed of a tire of a vehicle.

[0022] <About internal part 20> The internal part 20 has an element body 21 and a lead wire 22. In this embodiment, the internal part 20 has two parallel lead wires 22. The tip of the lead wire 22 is exposed from the primary molding part 30. A part of the tip of the lead wire 22 exposed from the primary molding part 30 is a soldering part 22a. The soldering part 22a is a part that is soldered to the conductor end 3. The conductor end 3, which is the tip of the coated electric wire 1, is fixed to the soldering part 22a by solder 4. The conductor end 3 is a part where the insulating coating part 2 that covers the conductor is stripped to expose the conductor. After the lead wire 22 and the conductor end 3 are fixed, the internal part 20 and the primary molding part 30 are molded by the secondary molding part 40. In this embodiment, the element body 21 is formed in a flat rectangular parallelepiped shape. A plurality of (here, two) lead wires 22 extend from one side of the outer periphery of the element body 21. The lead wires 22 extend to one side in the thickness direction of the element body 21. The lead wires 22 extend at an angle to the main surface of the element body 21. The lead wires 22 may be perpendicular or parallel to the main surface of the element body 21.

[0023] The element body 21 detects, for example, a magnetic physical quantity or a change therein. The value detected by the element body 21 is transmitted to a control unit (not shown) and is used, for example, to measure the rotation speed of a wheel. The element body 21 is formed, for example, in a rectangular shape. In the following description, the longitudinal direction of the secondary molded portion 40 is the longest direction among the three directions parallel to each side of the rectangular parallelepiped secondary molded portion 40, assuming a state in which the internal part 20 is covered by the primary molded portion 30 and the secondary molded portion 40. In other words, the element body 21 is held by the primary molded portion 30, and the element body 21 and the primary molded portion 30 are covered by the secondary molded portion 40. The element body 21 is embedded in a portion of the secondary molded portion 40 near one end in the longitudinal direction, and the lead wire 22 extends toward the other end in the longitudinal direction of the secondary molded portion 40. That is, the secondary molded section 40 is formed in a shape that is long in one direction in order to accommodate the element body section 21 in one end and the lead wire 22 in the other end. The longitudinal direction of the secondary molded section 40 may be considered to be the direction connecting the portion accommodating the element body section 21 and the portion accommodating the lead wire 22. In the figure, the longitudinal direction of the secondary molded section 40 is indicated by arrow A.

[0024] <Primary molding section 30> Fig. 4 is a plan view showing the composite molded part 10. Fig. 5 is a cross-sectional view taken along line VV in Fig. 4. The primary molded part 30 is a resin part that covers the internal part 20. The primary molded part 30 is a part that is molded using the same resin material as the internal part 20 as an insert. A through-hole part 31 that penetrates to the internal part 20 and an annular rib part 32 are formed in the primary molded part 30.

[0025] More specifically, the primary molding portion 30 has a main body accommodating portion 37, a lead wire base end accommodating portion 38, and a lead wire tip holding portion 39. The main body accommodating portion 37 covers the element main body portion 21. The lead wire base end accommodating portion 38 is continuous with the main body accommodating portion 37 on the side from which the lead wire 22 extends. The main body accommodating portion 37 and the lead wire base end accommodating portion 38 form a rectangular parallelepiped. The base end of the lead wire 22 is buried in the lead wire base end accommodating portion 38.

[0026] The lead wire tip holding portion 39 extends on the opposite side of the lead wire base end housing portion 38 from the main body housing portion 37. The lead wire tip holding portion 39 has lead wire placement portions 35 corresponding to each lead wire 22, and a partition portion 36. The lead wire placement portions 35 extend along one main surface of the lead wires 22 extending from the lead wire base end housing portion 38. The partition portion 36 extends between the multiple lead wire placement portions 35 so as to separate the multiple lead wires 22 extending from the lead wire base end housing portion 38. Since the two lead wires 22 are isolated by the partition portion 36, the lead wires 22 are prevented from contacting each other.

[0027] The through hole portion 31 is a mark formed by inserting a positioning portion of a mold when molding the primary molded portion 30 with the internal component 20 as an insert. The through hole portion 31 penetrates until it reaches the surface of the internal component 20, and a part of the surface of the internal component 20 is exposed in the through hole portion 31. In this embodiment, the through hole portion 31 is formed in the lead wire base end accommodating portion 38. The number of the through hole portions 31 is not limited, but in this embodiment, they include a first through hole portion 31a, a second through hole portion 31b, and a third through hole portion 31c.

[0028] Here, the annular rib portion 32 will be described. When the secondary molded portion 40 is molded using the primary molded portion 30 as an insert, the heated and melted resin for molding the secondary molded portion 40 is injected into the mold device. When the heated and melted resin comes into contact with the surface of the primary molded portion 30, it is rapidly cooled and solidified. The heated and melted resin is not cooled as rapidly at the tip of the annular rib portion 32 as when it comes into contact with the surface of the other primary molded portion 30. For this reason, it is expected that the heated and melted resin for forming the secondary molded portion 40 will melt with the tip of the annular rib portion 32. This will result in more complete water blocking along the annular rib portion 32 at the boundary between the primary molded portion 30 and the secondary molded portion 40. Such an annular rib portion 32 is sometimes called a melt rib. It is preferable that the primary molded portion 30 and the secondary molded portion 40 are made of the same material so that the annular rib portion 32 and the secondary molded portion 40 can be easily melted with each other.

[0029] Such an annular rib portion 32 protrudes toward the secondary molded portion 40 so as to surround the positioning portion 33 of the primary molded portion 30. The positioning portion 33 is a recess into which a positioning portion of a mold is fitted when the secondary molded portion is molded using the internal part 20 and the primary molded portion 30 as inserts. The number of the positioning portions 33 is not limited, but in this embodiment, the positioning portions 33 include a first positioning portion 33a, a second positioning portion 33b, and a third positioning portion 33c. The annular rib portion 32 includes a first annular rib portion 32a surrounding the first positioning portion 33a, a second annular rib portion 32b surrounding the second positioning portion 33b, and a third annular rib portion 32c surrounding the third positioning portion 33c. 5, in the longitudinal direction (arrow A direction) of the secondary molded portion 40, the second annular rib portion 32b and the third annular rib portion 32c are positioned in parallel along the width direction (parallel direction of the lead wires 22: arrow B direction) of the internal component 20 at a position different from the first annular rib portion 32a. In this embodiment, the first through hole portion 31a is positioned closer to the element body portion 21 than the second annular rib portion 32b and the third annular rib portion 32c.

[0030] The first positioning location 33a is located, for example, at the center of the width direction (arrow B direction) of the internal component 20. The second positioning location 33b and the third positioning location 33c are located on either side of the center of the width direction (arrow B direction) of the internal component 20. The second positioning location 33b and the third positioning location 33c are at the same distance from the center of the width direction (arrow B direction) of the internal component 20. With such an arrangement of the first positioning location 33a, the second positioning location 33b, and the third positioning location 33c, the positioning locations 33 are located symmetrically with respect to the center line of the width direction (arrow B direction) of the internal component 20. This reduces bias in the support force of the primary molded portion 30 by the mold when the secondary molded portion 40 is molded in the width direction (arrow B direction) of the internal component 20. In this embodiment, the annular rib portion 32 is formed to surround each positioning point 33, so that the annular rib portion 32 is also positioned symmetrically with respect to the center line of the internal part 20 in the width direction (direction of arrow B).

[0031] As shown in FIG. 5, at least a part of the through hole portion 31 and at least a part of the annular rib portion 32 overlap in the longitudinal direction of the secondary molded portion 40. In this embodiment, the first through hole portion 31a and the second through hole portion 31b are located on both sides of the first annular rib portion 32a in the width direction (arrow B direction) perpendicular to the longitudinal direction (arrow A direction) of the secondary molded portion 40. Note that "at least a part of the through hole portion 31 and at least a part of the annular rib portion 32 overlap in the longitudinal direction of the secondary molded portion" does not mean that the through hole portion 31 and the annular rib portion 32 overlap in a plan view. It means that the arrangement region of at least a part of the through hole portion 31 and the arrangement region of at least a part of the annular rib portion 32 overlap in the coordinate along the longitudinal direction (arrow A direction) of the secondary molded portion 40. By arranging in this way, the composite molded part 10 can be shortened in the longitudinal direction (arrow A direction) of the secondary molded part 40. This allows the composite molded part 10 to be made smaller as a whole.

[0032] In this embodiment, the first through hole portion 31a and the second through hole portion 31b are located on either side of the center in the width direction (arrow B direction) of the internal component 20. The first through hole portion 31a and the second through hole portion 31b are equidistant from the center in the width direction (arrow B direction) of the internal component 20. Due to such positions of the first through hole portion 31a and the second through hole portion 31b, bias in the support force of the internal component 20 by the mold during molding of the primary molded portion 30 is reduced.

[0033] Moreover, the third through hole portion 31c is located at a position different from the first through hole portion 31a and the second through hole portion 31b in the longitudinal direction (arrow A direction) of the secondary molded portion 40. In this embodiment, the third through hole portion 31c is located closer to the tip end side of the lead wire 22 than the first through hole portion 31a and the second through hole portion 31b. The third through hole portion 31c is located, for example, at the center of the width direction (arrow B direction) of the internal component 20. With such an arrangement of the first through hole portion 31a, the second through hole portion 31b, and the third through hole portion 31c, the through hole portion 31 is located symmetrically across the center line of the width direction (arrow B direction) of the internal component 20. This reduces the bias of the support force of the internal component 20 by the mold when molding the primary molded portion 30 in the width direction (arrow B direction) of the internal component 20.

[0034] 1 and 4, the first through hole portion 31a penetrates to a position where a part of the lead wire 22 is exposed from the primary molded portion 30. Similarly, the second through hole portion 31b penetrates to a position where a part of the lead wire 22 is exposed from the primary molded portion 30. Due to such an arrangement of the first through hole portion 31a and the second through hole portion 31b, the lead wire 22 is stably supported by a positioning portion of the mold when the primary molded portion 30 is molded.

[0035] 1 and 4, the third through hole portion 31c penetrates to a position where both of the two lead wires 22 are exposed from the primary molded portion 30. More specifically, the third through hole portion 31c is a hole that is wider than the distance between the two lead wires 22. The inward portions of the two lead wires 22 are exposed at the bottom of the third through hole portion 31c. Due to such a position of the third through hole portion 31c, the lead wires 22 are stably supported by the positioning pins of the mold when the primary molded portion 30 is molded.

[0036] Fig. 6 is a cross-sectional view taken along line VI-VI in Fig. 4, showing the primary molded portion 30 together with the mold 50. Fig. 7 is a cross-sectional view taken along line VII-VII in Fig. 4, showing the primary molded portion 30 together with the mold 50. Fig. 8 is a cross-sectional view taken along line VIII-VIII in Fig. 4, showing the primary molded portion 30 together with the mold 50. Note that VV is a straight line passing through the center of the internal part 20 in the width direction. Also, Figs. 6 to 8 show a cross section of the primary molded portion 30 during molding, and the secondary molded portion 40 is not shown.

[0037] As shown in FIG. 6, the mold 50 used when molding the primary molded portion 30 has a positioning portion 51a that forms the first through hole portion 31a and a positioning portion 51b that forms the second through hole portion 31b. In this embodiment, the positioning portion 51a and the positioning portion 51b support and fix the lead wire 22. The mold 50 also has a protrusion 53a that forms the first positioning location 33a and a recess 52a that forms the first annular rib portion 32a. In this way, the first through hole portion 31a, the second through hole portion 31b, the first positioning location 33a, and the first annular rib portion 32a are included in the same cross section perpendicular to the longitudinal direction (the direction of the arrow A in FIG. 4) of the secondary molded portion 40, so that the composite molded part 10 can be shortened in the longitudinal direction (the direction of the arrow A in FIG. 4) of the secondary molded portion 40. The positioning portions 51a, 51b and the protrusion 53a may be portions formed by the uneven shape of the mold surface itself, or may be pins added to the mold surface.

[0038] As shown in Fig. 7, the mold 50 has a protrusion 53b that forms the second positioning portion 33b and a recess 52b that forms the second annular rib portion 32b. As shown in Fig. 8, the mold 50 has a positioning portion 51c that forms the third through-hole portion 31c. The positioning portion 51c supports and fixes both of the two lead wires 22. The protrusion 53b and the positioning portion 51c may be portions formed by the uneven shape of the mold surface itself, or may be pins added to the mold surface.

[0039] In the composite molded part 10 configured as described above, at least a part of the through hole 31 and at least a part of the annular rib 32 overlap in the longitudinal direction of the secondary molded part 40. This allows the secondary molded part 40 to be shortened in the longitudinal direction. This allows the composite molded part 10 to be made smaller as a whole.

[0040] Furthermore, in the through hole portion 31, the first through hole portion 31a and the second through hole portion 31b are located on both sides of the first annular rib portion 32a in the width direction (arrow B direction) perpendicular to the longitudinal direction of the secondary molded portion 40. This allows the composite molded part 10 to be shortened in the longitudinal direction of the secondary molded part 40, and allows the die 50 to stably support the internal part 20 during primary molding.

[0041] Additionally, the third through-hole portion 31c penetrates at a position that exposes a portion of each of the two lead wires 22. This allows the die 50 to stably support the lead wires 22 during the primary molding.

[0042] [Embodiment 2] 9 is a plan view showing the primary molded section 230 in embodiment 2. The first through hole section 231a and the second through hole section 231b in the primary molded section 230 do not open to the outside in the width direction (arrow B direction) of the primary molded section 230. In this embodiment, similar to the third through hole section 31c, the first through hole section 231a and the second through hole section 231b are formed inside the primary molded section 230 in plan view.

[0043] [Embodiment 3] FIG. 10 is a cross-sectional view showing the primary molding part 330 together with the die 350, taken at a position corresponding to the cross section taken along line VI-VI in FIG.

[0044] As shown in FIG. 10, the first through hole portion 331a and the second through hole portion 331b penetrate the internal component 20 at both outer ends in the width direction (arrow B direction) of the internal component 20 in a direction exposing both side surfaces in the width direction (arrow B direction). In this embodiment, the first through hole portion 331a and the second through hole portion 331b are formed by the positioning portion 351a and the positioning portion 351b of the mold 350. The side surface 22b of the lead wire 22 is arranged so as to abut against the positioning portion 351a and the positioning portion 351b of the mold 350 during primary molding. As a result, the side surface 22b of the lead wire 22 of the internal component 20 is exposed from the primary molding portion 330. Due to such an arrangement of the first through hole portion 331a and the second through hole portion 331b, the primary molding is performed in a state in which the mold 350 (the positioning portion 351a and the positioning portion 351b) abuts against the side surface 22b of the lead wire 22. Therefore, when the primary molded portion 30 is molded, the width direction (direction of arrow B) of the internal part 20 can also be restricted.

[0045] [others] In the above embodiment, three through hole portions 31 (231) are formed, but the number is not limited to three through hole portions 31 (231). One or more through hole portions 31 (231) are within the scope of the present invention. Similarly, three positioning points 33 (or annular rib portions 32) are formed, but the number is not limited to three positioning points 33 (or annular rib portions 32). One or more positioning points 33 (or annular rib portions 32) are within the scope of the present invention.

[0046] In the above embodiment, the annular rib portion 32 is formed so as to surround all of the positioning points 33, but this is not limiting. The annular rib portion 32 does not have to be located at a position that surrounds the positioning points 33. The annular rib portion 32 may be formed so as to surround some of the positioning points 33.

[0047] Furthermore, in the above-described embodiment, the through-hole portions 31 (231) are positioned symmetrically across the center in the width direction (arrow B direction) of the internal part 20, but this is not limited thereto. Moreover, the positioning points 33 (or the annular rib portion 32) are also positioned symmetrically across the center in the width direction (arrow B direction) of the internal part 20, but this is not limited thereto. Any configuration in which at least a portion of the through-hole portion 31 (231) and at least a portion of the annular rib portion 32 overlap in the longitudinal direction of the secondary molded portion 40 is included in the present invention.

[0048] The configurations described in the first to third embodiments can be combined as appropriate as long as they are not mutually inconsistent. [Explanation of symbols]

[0049] 1. Insulated wire 2 Insulating coating 3 Conductor end 4 Solder 10 Composite molding parts 20 Internal parts 21 Element body 22 Lead Wire 22a Soldering part 22b Side 30,230,330 Primary forming part 31,231 Through hole 31a, 231a, 331a 1st through hole part 31b, 231b, 331b 2nd through hole part 31c 3rd through hole section 32 Circular rib 32a First annular rib 32b Second annular rib 32c Third annular rib 33 Positioning point 33a First positioning point 33b Second positioning point 33c Third positioning point 34 Recess 35 Tip placement part 36 Isolation section 40 Secondary forming part 50 Mold 51a, 51b, 51c, 351a, 351b Positioning part 52a, 52b Recess 53a,53b Projection

Claims

1. Internal parts and A primary molded part covering the internal part; A secondary molded portion covering the primary molded portion, The primary molded portion is formed with a through hole portion penetrating to the internal component and an annular rib portion protruding toward the secondary molded portion so as to surround a positioning location of the primary molded portion, The through hole portion includes a first through hole portion and a second through hole portion, the annular rib portion includes a first annular rib portion, The first through hole portion and the second through hole portion are located on both sides of the first annular rib portion in a width direction perpendicular to the longitudinal direction of the secondary molded portion, In the longitudinal direction, at least a portion of the first annular rib portion overlaps with at least a portion of the first through hole portion and at least a portion of the second through hole portion, the first through hole portion and the second through hole portion open to an outer side in a width direction of the primary molding portion and to a surface side on which the first annular rib portion is formed, The internal component has two parallel lead wires, The first through hole portion and the second through hole portion expose the lead wire from the primary molding portion.

2. A composite molded part according to claim 1, The annular rib portion includes a second annular rib portion and a third annular rib portion, A composite molded part, wherein the second annular rib portion and the third annular rib portion are positioned in parallel along the width direction at a position different from the first annular rib portion in the longitudinal direction.

3. A composite molded part according to claim 1 or claim 2, A composite molded part, wherein the first through hole portion and the second through hole portion penetrate the internal part at both outer ends in the width direction in a direction exposing both side surfaces in the width direction.

4. A composite molded part according to any one of claims 1 to 3, The through hole portion includes a third through hole portion, the third through hole portion penetrates at a position where a portion of each of the two lead wires is exposed.

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