JP5861034B2 - Fixed structure - Google Patents

Description

  The present invention relates to a fixed structure used in various electronic devices.

  Hereinafter, a conventional fixed structure will be described with reference to the drawings. FIG. 14 is a cross-sectional view of a conventional fixing structure, in which an electronic component 2 is mounted on a resin plate 1, and a fixing portion 3 of a structure (not shown) such as a heat sink or a bus bar is fixed by a fixing means 4. Thus, the structure (not shown) is mechanically fixed to the resin plate 1 by being fixed to the resin plate 1, and then the fixing portion 3 and the electronic component 2 are electrically connected.

  Here, as described above, the electrical connection between the fixing portion 3 and the electronic component 2 is performed via the wiring pattern 7 to which the resist 6 is applied on the upper surface side of the resin plate 1, and the mounting density is increased. When necessary, the resist 6 and the wiring pattern 7 are simultaneously performed on the lower surface side of the resin plate 1. Then, a resist 6 is formed in advance on the surface of the resin plate 1 between the head 5 of the fixing means 4 and the resin plate 1 in order to insulate the portions where the conductors should not contact each other. In order to electrically insulate the wiring pattern 7 formed on the lower surface of the head 1 from the head 5 and the washer 8, the resist 6 is generally used.

  For example, Patent Document 1 is known as prior art document information relating to the invention of this application.

JP 2011-49106 A

  However, in the conventional fixing structure, in particular, the fixing portion 3 and the fixing means 4 are joined by solder 9 or the like in order to ensure mechanical fixation and electrical connection between the fixing portion 3 and the fixing means 4. When it does, the pressure of the space part 10 enclosed by the fixing | fixed part 3, the fixing means 4, the head 5, and the resin board 1 will rise by the high temperature added at the time of this joining. When such a fixing structure is put into the reflow solder tank together with the electronic component 2 mounted on the resin plate 1 or the like, the fixing portion 3, the fixing means 4, The pressure of the space part 10 enclosed by the head 5 and the resin plate 1 will rise.

  And the gas of the pressure which raised here perforates the clearance gap for releasing pressure between the resin board 1 and the resist 6 in the lower surface side of the resin board 1 with a low mechanical adhesiveness compared with another site | part. In some cases, bubbles 11 are formed between the resin plate 1 and the resist 6, and the bubbles 11 may change the positional relationship between the resin plate 1 and the fixing portion 3 or the fixing means 4. There was something. As a result, these fixed states are deteriorated, or stress due to the bubbles 11 causes the wiring pattern 7 to be deformed, so that an increase in pressure in the space 10 is mechanically or electrically applied to the wiring board fixing structure. There is a problem that it may cause excessive degradation.

  Therefore, an object of the present invention is to suppress an increase in gas pressure at a high temperature in the space and improve the mechanical and electrical stability of the fixed structure.

In order to solve the above problems, the present invention arranges a mounting component having a fixing portion provided with a screw hole on a wiring board provided with a resist on the surface and provided with a through hole, and fixing the fixing portion of the mounting component. and inserted into the through hole formed in the wiring substrate into a screw hole provided in the by screwing a fixing member comprising a threaded portion and a head portion, the head portion and the mounting part of the wiring board the fixing member in fixed structure sandwiched by the fixing portion of the communicating means to communicate with the outside of the air gap formed between the peripheral surface of the fixing member and the peripheral surface of the through hole formed in the wiring substrate, The screw hole is provided with a groove portion extending from one opening side of the fixing portion to the other opening side .

  According to the present invention, when the pressure in the gap increases, the pressure is released to the outside of the fixed structure through the communication means communicating with the gap, thereby suppressing the occurrence of distortion in the fixed structure. The positional relationship and the like of each part of the structure can be stably maintained, and as a result, the reliability of the fixed structure can be improved.

The perspective view which showed the fixed structure in Example 1 of this invention Sectional view of the main part Side view of the main part The 1st sectional view of the important section showing the fixed structure in Example 2 of the present invention. Top view of the main part Second sectional view of the main part The side view of the principal part which showed the fixed structure in Example 3 of this invention Sectional view of the main part The perspective view which showed the fixed structure in Example 4 of this invention Sectional view of the main part Sectional drawing of the principal part which showed the other Example. Top view of the main part The top view of the principal part which showed the other Example Sectional drawing of the principal part which showed the conventional fixed structure

  Hereinafter, the invention described in the first and second aspects of the present invention will be described with reference to Example 1.

  FIG. 1 is a perspective view showing a fixing structure in Embodiment 1 of the present invention, and FIG. 2 is a cross-sectional view of the main part. The fixing structure includes a substrate 12 and the substrate 12 as shown in FIG. The electronic component 13 mounted on one upper surface of the electronic component 13 and a heat radiating plate 14 for radiating heat generated in the electronic component 13 are provided. As shown in FIG. 2, the substrate 12 includes a fixing means 18 including a screw portion 16 that is passed through a through hole 15 provided in the substrate 12 and a head portion 17 that is connected to the screw portion 16, and a heat sink 14. The positional relationship between the substrate 12 and the heat radiating plate 14 is fixed by being pinched by the fixing portion 19 which is a portion where the portion is extended. Naturally, the fixing means 18 and the fixing portion 19 are fixed in a state where they are screwed together by the female screw portion 20 and the screw portion 16 provided on the inner peripheral side of the fixing portion 19.

  Here, when the hole diameter dimension of the through hole 15 is larger than the outer diameter dimension of the screw portion 16 and the hole diameter dimension of the through hole 15 is smaller than the outer diameter dimension of the fixing means 18 and the outer diameter dimension of the washer 21, The first space 22 is formed as a gap in the region surrounded by the hole 15, the fixing part 19, the fixing means 18 and the washer 21. And the 2nd space part 23 is formed in the fixing | fixed part 19 as a communication means which connects this 1st space part 22 and the exterior.

  According to this configuration, even when the periphery of the fixing portion 19 and the fixing means 18 is covered by bonding or welding by resin or soldering, the first space portion 22 is connected to and communicated with the second space portion 23. Therefore, it is difficult to be in a sealed state. Thereby, even if the temperature rises in the first space portion 22, the pressure does not increase therewith, and as a result, the first space portion 22 is interposed between the resist 24 having a relatively small adhesion and the substrate 12. Invasion of the expanded atmosphere due to the increase in the pressure will not occur. Therefore, no deformation or dimensional distortion occurs in the substrate 12 or the resist 24, and the positional relationship between the fixing portion 19 or the fixing means 18 and the substrate 12 does not change, and the positional relationship of each part is stably maintained. Will be able to. In addition, the wiring pattern 25 covered with the resist 24 is not subjected to stress due to the expanded atmosphere, and if the wiring pattern 25 is located outside the washer 21, the temperature in the first space 22 is increased. Even if there is, it will not cause disconnection.

  Here, as shown in the side view of FIG. 3, the communication means communicating with the first space portion 22 is provided with a groove portion 26 having a groove surface that does not contact the substrate 12, and this groove portion 26. Can be used as the second space portion 23 shown in FIG.

  Further, as shown in FIG. 3, the groove 26 is provided on the surface on the opposite side of the substrate 12 from the head 17, the resist 24 with which the head 17 contacts and the wiring pattern (not shown). 2 is closed by some external factor (for example, a welding material or an adhesive), the pressure increase in the vertical direction in FIG. It will occur with the rise of. This pressure also acts in the direction in which the pressing force between the substrate 12 and the head 17 and the washer 21 increases on average, so that the degree of adhesion between the resist 24 and the substrate 12 is increased, and the space between the resist 24 and the substrate 12 is increased. It acts in the direction which suppresses that the atmosphere penetrate | invades. In order to further enhance the suppression effect, it is desirable that the volume of the second space portion 23 is larger than the volume of the first space portion 22 to generate pressure in the vertical direction over a wide range. About this, the control in adjusting the volume of the 2nd space part 23 by forming the 2nd space part 23 mainly using the fixing | fixed part 19 is very easy, and the tolerance | permissible_range of the volume is large. Become. Alternatively, in the illustrated embodiment, the second space portion 23 is provided in two directions on the left and right sides with the screw portion 16 as the center. There may be four directions intersecting, or five directions or six directions. That is, by providing a plurality of second space portions 23, it is possible to reduce the probability that the opening side of the second space portion 23 is closed, and at the same time, even when all of the second space portions 23 are closed. The vertical pressure in the second space portion 23 of the second space portion 23 is distributed in the peripheral direction around the screw portion 16, so that the atmosphere easily enters between the resist 24 and the substrate 12. And the difference from the part that is difficult to invade is reduced, and the force is not concentrated on a specific part. As a result, the intrusion of air between the resist 24 and the substrate 12 is further suppressed. Of course, in order to reduce the probability of the above-mentioned closed state, the second space portion 23 may be extended greatly in the left-right direction in the figure, and this also mainly focuses on the second space portion 23. This is an advantage by forming using the fixing portion 19. In forming the plurality of second space portions 23, by arranging them symmetrically with the screw portion 16 as the center, a portion where the air easily enters between the resist 24 and the substrate 12 or The difference between the parts that are difficult to enter is reduced.

  Here, as described above, the structure of the fixing means 18 and the fixing portion 19 shown in FIG. 2 has been described as the structure for fixing the heat radiating plate 14 to the substrate 12 as shown in FIG. 1 is not limited to the fixing of the heat sink 14 and the substrate 12 shown in FIG. 1, but may be applied to the fixing of the bus bar 27 and the substrate 12 as current-carrying conductors. You may apply to fixation with the board | substrate 12. FIG. Alternatively, when an electrode terminal (not shown) such as a device corresponding to a large current is to be enlarged, the electrode terminal (not shown) and the substrate 12 may be fixed. In particular, when a fixing structure is applied using the fixing portion 19 as an electrode terminal (not shown) such as a heat dissipation plate 14 or a device corresponding to a large current, the first space portion 22 shown in FIG. 2 due to self-heating during operation of the electronic device. In addition, it is possible to suppress an increase in pressure in the second space portion 23 and to stably maintain the positional relationship between the fixing portion 19 and the fixing means 18 and the substrate 12. Further, the fixing portion 19 can be easily controlled to increase the dimension in the planar direction of the substrate 12 as compared with the head portion 17 and can easily improve the electrical and thermal conduction characteristics as described above. is there.

  Here, the embodiment in which the resist 24 is provided on one surface of the substrate 12 is shown as an example, but there is no problem even if the resist 24 in contact with the screw portion 16 and the fixing portion 19 is provided on both surfaces of the substrate 12. Absent.

  In the following, the second embodiment of the present invention will be described with reference to the third and fourth aspects of the present invention.

  FIG. 4 is a cross-sectional view of a fixing structure according to a second embodiment of the present invention. The fixing structure is a screw portion 16 that is passed through a through hole 15 provided in the substrate 12 and a head portion 17 that is connected to the screw portion 16. The positional relationship is fixed by being sandwiched between the fixing means 18 and the fixing portion 19. Naturally, the fixing means 18 and the fixing portion 19 are fixed in a state where they are screwed together by the female screw portion 20 and the screw portion 16 provided on the inner peripheral side of the fixing portion 19.

  Here, when the hole diameter of the through hole 15 is larger than the outer diameter of the screw part 16 and the diameter of the through hole 15 is smaller than the outer diameter of the fixing means 18 and the outer diameter of the washer 21, The first space 22 is formed as a gap in the region surrounded by the hole 15, the fixing part 19, the fixing means 18 and the washer 21. And the 2nd space part 29 as the communication means connected and connected to this 1st space part 22 is formed in especially the internal thread part 20 of the fixing | fixed part 19, and this 2nd space part 29 is the fixed part 19's It is provided so as to continue to both the opening on the side where the screw part 16 that is the side facing the substrate 12 is inserted and the opening on the side opposite to the substrate 12 of the fixing part 19. That is, as shown in the top view of FIG. 5, the second space portion 29 is formed by providing an inner circumferential groove portion 30 corresponding to a notch in a part of the female screw portion 20 located around the screw portion 16 in the fixing portion 19. Provided.

  Here, an example in which one inner peripheral groove portion 30 is provided in the fixing portion 19 is shown, but a plurality may be disposed around the screw portion 16. Alternatively, although the inner circumferential groove portion 30 is used, the groove shape need not be a narrow notch shape, and may be a fan shape that opens toward the screw portion 16 around the female screw portion 20. Thereby, as described later, it is possible to more effectively suppress the blocking of the second space portion 29 and stably maintain the fixed state of the fixing portion 19 and the screw portion 16.

  According to this configuration, even if the periphery of the fixing means 18 shown in FIG. 4 is covered with resin, welding, soldering, or the like, the upper side in the figure, which is the opening on the side opposite to the substrate 12 in the fixing portion 19 If the opening is maintained, the first space portion 22 is connected to the second space portion 29, so that it is difficult to be in a sealed state. Even if the opening on the upper side of the second space portion 29 in the drawing is closed, although not shown, the screw portion 16 extends from the outer peripheral surface of the cylindrical portion of the fixing portion 19 to the second space portion 29. It is also possible to provide a means for avoiding a sealed state by providing a vent hole that communicates in a direction substantially perpendicular to the axial direction.

  From the above, deformation and dimensional distortion are unlikely to occur in the substrate 12 and the resist 24, and the positional relationship between the fixing portion 19 and the fixing means 18 and the substrate 12 is not easily changed. It can be kept stable.

  Further, as a means for maintaining the opening of the fixing portion 19 on the side opposite to the substrate 12, that is, for reducing the blocking of the first space portion 22 and the second space portion 29, the second space portion 29 is used. By making the taper shape wider toward the upper side in the figure, the opening area on the upper side than the substrate 12 side can be increased, and the opening on the dimensions can be easily maintained. Alternatively, instead of extending the second space portion 29 linearly in a direction parallel to the axial direction of the screw portion 16, the second space portion 29 is extended with an inclination with respect to the axial direction of the screw portion 16, or the screw portion 16. The second space portion 29 is provided by an inner circumferential groove portion 30 shown in FIG. 5 in a spiral or non-linear manner so as to draw a spiral with an angle smaller than the spiral of the screw portion 16 with respect to the axial direction. It doesn't matter. This is fixed on the axis of the through hole 15 of the substrate 12 as shown in the sectional view of FIG. 6 as viewed from the direction of the arrow X with the screw portion 16 removed for the line segment YY ′ in FIG. The inner circumferential groove portion 30 corresponding to the second space portion 29 provided on the inner circumferential side of the fixed portion 19 may be inclined in the region where the female screw portion 20 is formed, and then vertically cut to both opening sides. As the direction of giving this inclination, if the female screw part 20 is a right-hand thread, the inner peripheral groove part 30 is provided in a direction from the upper right to the lower left in the figure in the fixing part 19, or vice versa from the upper left in the figure. It may be provided in a direction toward the lower right.

  In this way, by giving the inner circumferential groove portion 30 an inclination, as shown in FIG. 4, welding and bonding operations are performed under the condition that the head portion 17 is positioned downward (direction of action of gravity) and the fixing portion 19 is positioned upward. When performing, even if a welding material and an adhesive try to penetrate | invade into the inner peripheral groove part 30 from the opening side of the inner peripheral groove part 30 applicable to the upper direction in the figure shown in FIG. Therefore, it tends to concentrate on one side (A side in the drawing) of the inner circumferential groove portion 30 and hardly exists on the other side (B side in the drawing) of the inner circumferential groove portion 30. This makes it difficult for the inner circumferential groove portion 30 to be blocked, and the fixing area by the welding material or adhesive increases from the upper side to the lower side of the inner circumferential groove portion 30, so that the fixing portion 19 and the screw portion 16 are fixed. The state can be stably maintained.

  Naturally, conversely to FIG. 4, if the fixing portion 19 is positioned downward (the direction of action of gravity) and the head portion 17 is positioned upward, the situation where the welding material or adhesive enters the inner circumferential groove portion 30 is It becomes difficult to occur, and it is possible to make it difficult to generate a state in which the second space portion 29 is closed.

  The invention according to claims 5 and 6 of the present invention will be described below using Example 3.

  FIG. 7 is a side view of the fixing structure according to the third embodiment of the present invention. Here, when the substrate 12 having the resist 24 formed on the surface thereof is sandwiched between the head 17 and the fixing portion 19, the head 17 Asperities are provided on the contact surface of the washer 21 with the substrate 12 and the resist 24 or the contact surface of the washer 21 with the substrate 12 and the resist 24.

  As a result, as shown in the cross-sectional view of FIG. 8, the first space 22 that is a gap provided between the screw portion 16 and the through hole 15, and the washer 21 and the resist 24 or the substrate 12 are provided. The second space portion 31 that is the communication means is connected and communicated. And the non-connecting side with the 1st space part 22 of the 2nd space part 31 is made into the opening side.

  According to this configuration, even when the periphery of the fixing portion 19 and the fixing means 18 is covered with resin or welding, the first space portion 22 is connected to the second space portion 31 and thus is unlikely to be sealed. It will be. As a result, even if the temperature rises in the first space portion 22, the pressure does not increase therewith, and as a result, the first space portion 22 is interposed between the resist 24 having a relatively small adhesion and the substrate 12. There will be no invasion of the expanded atmosphere with increasing pressure. As a result, no deformation or dimensional distortion occurs in the substrate 12 or the resist 24, the positional relationship between the fixing portion 19 or the fixing means 18 and the substrate 12 does not change, and the positional relationship of each part is stably maintained. Will be able to keep.

  FIG. 8 shows a form in which the second space portion 31 is provided by providing the washer 21 with unevenness. However, the second space 31 is provided by providing unevenness on the side of the head 17 that is located on the substrate 12 without providing the washer 21. The space 31 may be provided. Or you may form an unevenness | corrugation in the head 17 or the washer 21 so that the 2nd space part 31 may be provided between the head 17 and the washer 21. FIG.

  On the other hand, although the 2nd space part 31 is provided by providing unevenness | corrugation in the head 17 and the washer 21 here, you may provide the 2nd space part 31 by the spacer (not shown) which substitutes for an unevenness | corrugation. Absent.

  That is, since these form the second space portion 31 in the portion accompanying the head 17 and the washer 21, the volume of the second space portion 31 can be controlled arbitrarily, inexpensively, and the first space portion 22. Therefore, it is possible to easily determine the appropriate volume of the second space portion. Of course, it is desirable that the second space portion 31 exists in a plurality of parts.

  Although not shown, the washer 21 may have an annular shape having a C-shaped opening regardless of whether the washer 21 is uneven. In that case, the opening is present only in one of the second spaces 31 shown in FIG. The size of the opening is not a minute gap that does not allow the tips of the openings to contact each other like a general spring washer, but an opening having a size equivalent to or larger than the outer diameter of the screw portion 16. It is desirable to have a part. As described above, it is desirable that the second space portion 31 is not closed by resin or welding, and since a capillary phenomenon or the like tends to occur in a minute gap, This is because the material may enter the second space 31 and suppress this. Therefore, it is possible to make the second space portion 31 less likely to be in a closed state by using an opening having a size equivalent to or larger than the outer diameter of the screw portion 16. At the same time, by increasing the volume ratio of the second space portion 31 to the first space portion 22, even when the first space portion 22 and the second space portion 31 are in a closed state, the substrate is increased during pressure rise. The pressure is applied not only to the boundary between the resist 12 and the resist 24 but also to the vertical direction in the figure of the resist 24 in the second space 31, and as a result, between the resist 24 and the substrate 12 having a relatively low adhesion. It is possible to suppress the intrusion of the air that has expanded.

  Hereinafter, the invention according to the seventh to ninth aspects of the present invention will be described with reference to Example 4.

  FIG. 9 is a perspective view showing a fixing structure in Embodiment 4 of the present invention, FIG. 10 is a cross-sectional view of the main part, and this wiring board fixing structure includes a substrate 12 and this substrate as shown in FIG. A bus bar 27 serving as a conductor for energizing a large current is provided on one of the top surfaces of 12.

  As shown in FIG. 10, the substrate 12 includes a fixing means 18 including a screw portion 16 that is passed through a through hole 15 provided in the substrate 12 and a head portion 17 that is connected to the screw portion 16, and a part of the bus bar 27. Is held by a fixing portion 19 which is a stretched portion, and the positional relationship is fixed. Naturally, the fixing means 18 and the fixing portion 19 are fixed in a state where they are screwed together by the female screw portion 20 and the screw portion 16 provided on the inner peripheral side of the fixing portion 19.

  Here, the first space portion 22 is formed as a gap portion in a region surrounded by the through hole 15, the fixing portion 19, the fixing means 18 and the washer 21. Then, a second space portion 32 which is a communication means connected to and communicated with the first space portion 22 is formed on the substrate 12. The second space portion 32 is provided by a substrate groove portion 33 on one surface or both surfaces of the substrate 12 as shown in FIG. 9, and the second space portion 32 is connected to the first space portion 22 as shown in FIG. Has been. At this time, the opening to the outside of the second space portion 32 that is not connected to the first space portion 22 extends outward from the outer peripheral portion 36 where the fixing portion 19 is in contact with the substrate 12. Is required.

  According to this configuration, since the first space 22 is connected to the second space 32 and opened, it is difficult to be in a sealed state. Thereby, even if the temperature rises in the first space portion 22, the pressure does not increase therewith, and as a result, the first space portion 22 is interposed between the resist 24 having a relatively small adhesion and the substrate 12. Invasion of the expanded atmosphere due to the increase in the pressure will not occur. Therefore, no deformation or dimensional distortion occurs in the substrate 12 or the resist 24, and the positional relationship between the fixing portion 19 or the fixing means 18 and the substrate 12 does not change, and the positional relationship of each part is stably maintained. Will be able to.

  Here, the second space portion 32 is provided on the surface of the substrate 12 opposite to the surface on which the resist 24 and the wiring pattern 25 are formed. Although there is basically no problem in forming on either one or both surfaces, the bonding surface between the substrate 12 and the resist 24 from the viewpoint of suppressing air intrusion from the bonding surface between the substrate 12 and the resist 24. However, it is desirable to reduce the number of exposed portions in the first space portion 22 and the second space portion 32. Therefore, it is desirable to provide the second space portion 32 on the surface of the substrate 12 opposite to the surface on which the resist 24 and the wiring pattern 25 are formed. Moreover, when providing the 2nd space part 32 (not shown) in the head 17 or the washer 21 side, it is required to extend outside the outer periphery of the head 17 or the washer 21.

  Alternatively, as shown in the cross-sectional view of FIG. 11, the second space 34 may be penetrated through both sides of the substrate 12. In this case, since the second space portion 34 can easily obtain a large volume with respect to the first space portion 22, the second space portion is disposed outside the outer periphery of the head 17 and the washer 21 in the substrate 12 as shown in FIG. 12. The effect with respect to avoidance of a sufficient sealing state can be acquired because 34 is extending | stretching.

  On the other hand, as shown in FIG. 13, only the first space portion 22 as the gap portion is provided as the space portion in the substrate 12, and the head portion 17 and the washer 21 are cut so that the first space portion is exposed to the outside. A notch 35 may be provided and used as a communication means. The notch 35 may be formed in a straight line as shown in the figure, but a fan-shaped notch may be provided in the head 17 so as to extend toward the center of the head 17. And if it is in the state where the front-end | tip of this fan-shaped notch reaches the 1st space part 22, it is sufficient.

  Although the bus bar 27 shown in FIG. 9 has been described as an example here, it is needless to say that the present invention may be applied to attachment of a heat radiating plate (not shown) or device electrode terminals (not shown).

  In the above, the individual embodiments have been described individually, but it goes without saying that the embodiments may be implemented by combining a plurality of embodiments.

  The wiring board fixing structure of the present invention has an effect of obtaining highly reliable mechanical fixing and electrical connection, and is useful in applying the board fixing structure to various electronic devices.

DESCRIPTION OF SYMBOLS 12 Board | substrate 13 Electronic component 14 Heat sink 15 Through-hole 16 Screw part 17 Head 18 Fixing means 19 Fixing part 20 Female screw part 21 Washer 22 1st space part 23, 29, 31, 32, 34 2nd space part 24 Resist 25 Wiring Pattern 26 Groove part 27 Bus bar 28 Shield 30 Inner peripheral groove part 33 Substrate groove part 35 Notch part 36 Outer peripheral part

Claims (7)

The mounting component having a fixing portion which screw holes are provided on a wiring board having a through-hole is provided with a resist is provided on a surface disposed, in the wiring substrate into a screw hole provided in the fixing portion of the mounting component by screwing the fixing member comprising a threaded portion and the head by inserting the provided through-holes, in the fixed structure in which the wiring board is sandwiched by the fixing portion of the mounting component and the head portion of the fixing member as communication means for communication with the exterior of the gap portion formed between the peripheral surface of the peripheral surface the fixing member through hole formed in the wiring substrate, one opening of the fixed portion to the screw hole The fixed structure which provided the groove part extended from the side to the other opening side. The fixing structure according to claim 1, wherein an extending direction of the groove portion is provided with an inclination with respect to an axial direction of the screw hole. A mounting component having a fixing portion provided with a screw hole is disposed on a wiring board provided with a resist on the surface and provided with a through hole, and the wiring board is placed in the screw hole provided in the fixing portion of the mounting component. In the fixing structure in which the wiring board is sandwiched between the head of the fixing member and the fixing part of the mounting component by inserting the through-hole provided and screwing the fixing member including the screw part and the head. As a communication means for communicating a gap formed between a peripheral surface of a through hole provided in the wiring substrate and a peripheral surface of the fixing member with the outside, an uneven portion on the wiring substrate side of the head The fixed structure which provided the space between the said head and the said wiring board by forming. A mounting component having a fixing portion provided with a screw hole is disposed on a wiring board provided with a resist on the surface and provided with a through hole, and the wiring board is placed in the screw hole provided in the fixing portion of the mounting component. In the fixing structure in which the wiring board is sandwiched between the head of the fixing member and the fixing part of the mounting component by inserting the through-hole provided and screwing the fixing member including the screw part and the head. As a communication means for communicating a gap formed between a peripheral surface of a through hole provided in the wiring board and a peripheral surface of the fixing member between the head and the wiring board, A fixed structure in which a space is provided between the washer and the wiring board by forming an uneven portion on the wiring board side of the disposed washer. A mounting component having a fixing portion provided with a screw hole is disposed on a wiring board provided with a resist on the surface and provided with a through hole, and the wiring board is placed in the screw hole provided in the fixing portion of the mounting component. In the fixing structure in which the wiring board is sandwiched between the head of the fixing member and the fixing part of the mounting component by inserting the through-hole provided and screwing the fixing member including the screw part and the head. As a communication means for communicating a gap formed between a peripheral surface of a through hole provided in the wiring substrate and a peripheral surface of the fixing member with the outside, the contact of the wiring substrate with the fixing portion A fixed structure provided with a substrate groove portion that reaches the outer periphery of the fixed portion from the through hole on the surface. A mounting component having a fixing portion provided with a screw hole is disposed on a wiring board provided with a resist on the surface and provided with a through hole, and the wiring board is placed in the screw hole provided in the fixing portion of the mounting component. In the fixing structure in which the wiring board is sandwiched between the head of the fixing member and the fixing part of the mounting component by inserting the through-hole provided and screwing the fixing member including the screw part and the head. As a communication means for communicating a gap formed between the peripheral surface of the through hole provided in the wiring board and the peripheral surface of the fixing member to the outside, the through hole is provided on the outer peripheral side of the fixing member. A fixed structure provided with extended through-hole extending portions. A mounting component having a fixing portion provided with a screw hole is disposed on a wiring board provided with a resist on the surface and provided with a through hole, and the wiring board is placed in the screw hole provided in the fixing portion of the mounting component. In the fixing structure in which the wiring board is sandwiched between the head of the fixing member and the fixing part of the mounting component by inserting the through-hole provided and screwing the fixing member including the screw part and the head. As a communication means for communicating a gap formed between the peripheral surface of the through hole provided in the wiring board and the peripheral surface of the fixing member with the outside, the fixing provided with a notch in the head Structure.

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