JP2022179103A - Substrate positioning structure - Google Patents

Abstract

To provide a substrate positioning structure capable of easily improving substrate positioning accuracy stored in a housing.SOLUTION: A substrate positioning structure includes a substrate 2 and a resin-made housing 1 in which the substrate 2 is stored, wherein the housing 1 has an opening to which the substrate 2 can be inserted, a bottom surface facing the opening, a peripheral wall 13 erected from the circumference of the bottom surface, a reference pin 14 erected from the bottom surface, and a plurality of pressing parts 15 which are provided so as to project inward from the inner surface of the peripheral wall 13, are brought into contact with a part of the circumference 2a of the substrate 2 stored in the housing 1 and press the substrate 2 to the inside of the peripheral wall 13, and act pressing forces P1 and P2, the substrate 2 has a through hole 22 to which the reference pin 14 is inserted, and a resultant force P3 of the plurality of pressing forces P1 and P2 acted by each of the plurality of pressing parts 15 acts on the reference pin 14 in the state where the reference pin 14 is inserted to the through hole 22, and the substrate 2 is stored in the housing 1.SELECTED DRAWING: Figure 4

Description

The present invention relates to a positioning structure for substrates housed in a housing.

For example, in an electronic device such as an ECU (Electronic Control Unit) mounted on a vehicle, a substrate is housed in a housing. Patent Literature 1 discloses the configuration of an electronic device storage case that stores a substrate. In the electronic device storage case described in Patent Document 1, the housing for storing the board has a box shape having a bottom surface and side walls, and crushing ribs for fixing the board to the inner surface are distributed on the side walls. The crushing rib is inclined so that the amount of inward projection increases toward the bottom surface of the housing. With such a configuration, in the electronic device storage case of Patent Document 1, the board is inserted into the housing from the opening formed in the housing, and the peripheral edge of the board is guided by the inclination of the crushing rib to crush the crushing rib. , the substrate is positioned at a predetermined position of the housing.

Japanese Unexamined Patent Application Publication No. 2012-9748

In the electronic device storage case described in Patent Document 1, the crushing ribs are arranged on the side walls facing each other. Therefore, if there is a difference in the amount of crushing between one and the other of the crushing ribs arranged on the opposing side walls, the substrates accommodated in the housing will vary in the housing position in the direction along the bottom surface of the housing. . Therefore, the substrate cannot be accurately positioned with respect to the housing.

In view of the above circumstances, there is a demand for a substrate positioning structure that can easily improve the positional accuracy of substrates housed in a housing.

A feature of the substrate positioning structure according to the present invention is that it includes a substrate and a housing made of resin in which the substrate is accommodated, and the housing has an opening into which the substrate can be inserted, and faces the opening. a bottom surface, a peripheral wall erected from a peripheral edge of the bottom surface, a reference pin erected from the bottom surface, and a peripheral edge of the substrate housed in the housing, provided so as to protrude inward from the inner surface of the peripheral wall. and a plurality of pressing portions that partly contact and press the substrate toward the inner side of the peripheral wall to apply a pressing force, and the substrate has a through hole through which the reference pin is inserted. , in a state in which the reference pin is inserted through the through hole and the substrate is accommodated in the housing, a resultant force of the plurality of pressing forces exerted by each of the plurality of pressing portions acts on the reference pin; It is in.

In this configuration, the substrate accommodated in the housing is subjected to a pressing force from a plurality of pressing portions provided inside the peripheral wall of the housing at the peripheral edge, and the resultant force of the pressing forces from the plurality of pressing portions acts on the substrate. acts on the reference pin inserted through the through hole of As a result, the substrate is positioned in the housing with the plurality of pressing portions pressing the reference pins. That is, the substrate accommodated in the housing is held in contact with the pressing portion and the reference pin at all times. Therefore, according to this configuration, it is possible to easily improve the positional accuracy of the substrate arranged in the housing. Further, in this configuration, the substrate housed in the housing is positioned using only the reference pins provided in the housing, the plurality of pressing portions provided in the housing, and the through holes formed in the substrate. Therefore, the structure for positioning the substrates housed in the housing can be realized with a simple configuration.

Another characteristic configuration is that the plurality of pressing portions are configured by crushing ribs.

As in this configuration, when the plurality of pressing portions are composed of crushing ribs, the dimensional tolerance of the substrate or the housing can be easily absorbed according to the amount of crushing of the crushing ribs, and the substrate is held in the housing. The state can be easily stabilized.

Another characteristic configuration is that the plurality of pressing portions are configured by a snap fit formed by providing a notch in the peripheral wall on the side of the opening.

According to this configuration, when the plurality of pressing portions are configured by snap-fitting, it is possible to easily absorb the dimensional tolerance of the substrate or the housing according to the amount of deformation of the snap-fitting, thereby holding the substrate in the housing. The state can be easily stabilized.

Another characteristic configuration is that the peripheral wall of the housing has a polygonal shape in a plan view, and the plurality of pressing portions are arranged on the inner surfaces of at least two non-parallel wall portions of the peripheral wall. It is in.

According to this configuration, since the peripheral wall of the housing has a polygonal shape in a plan view, a polygonal substrate can be easily accommodated in the housing. Further, when the plurality of pressing portions are arranged on the inner surfaces of at least two non-parallel wall portions of the peripheral wall, the resultant force of the plurality of pressing forces acting when each of the plurality of pressing portions presses the substrate is unidirectional. It becomes the pressing force acting on Therefore, the resultant force can be reliably applied to the reference pin to accurately position the substrate. Moreover, since the plurality of pressing portions may be arranged on the inner surfaces of at least two non-parallel wall portions of the peripheral wall, the number of pressing portions in the housing can be reduced and the shape of the housing can be simplified.

1 is a perspective view of an electronic device according to a first embodiment; FIG. 1 is an exploded perspective view of an electronic device; FIG. 2 is a plan view of the housing side of the electronic device; FIG. It is the top view which looked at the electronic device from the opening side of a housing|casing. 1 is a partial cross-sectional view of an electronic device; FIG. FIG. 4 is a partial perspective view of a housing in a modified example of the first embodiment; It is a fragmentary sectional view of the modification of 1st Embodiment. It is the top view which looked at the electronic device which concerns on 2nd Embodiment from the opening side of a housing|casing. It is the top view which looked at the electronic device which concerns on 3rd Embodiment from the opening side of a housing|casing.

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a substrate positioning structure according to the present invention will be described below with reference to the drawings. In this embodiment, a circuit board is used as a substrate for explanation. However, without being limited to the following embodiments, various modifications are possible without departing from the scope of the invention.

[First Embodiment]
The electronic device 100 shown in FIGS. 1 to 5 is, for example, an ECU or the like mounted on a vehicle. An electronic device 100 shown in FIG. 1 includes a housing 1 , a circuit board 2 (hereinafter referred to as “board 2 ”; see FIG. 2 ), a connector 3 , and a lid 4 . In the following description, X is the longitudinal direction of the housing 1 and the substrate 2, Y is the lateral direction of the housing 1 and the substrate 2, and Z is the thickness direction of the housing 1 and the substrate 2.

In the electronic device 100, the housing 1, the substrate 2, and the lid 4 are formed in a rectangular shape in plan view (Z direction view). As shown in FIG. 2, the housing 1 includes an opening 11 into which the substrate 2 can be inserted, a bottom surface 12 facing the opening 11, and a peripheral wall extending substantially perpendicularly from the periphery of the bottom surface 12 to the bottom surface 12. 13 and. The opening 11 is formed by an end portion 13 a of the peripheral wall 13 on the side opposite to the bottom surface 12 . The opening 11 and the bottom surface 12 of the housing 1 are formed in a rectangular shape. The substrate 2 is smaller than the area of the opening 11 and the bottom surface 12 in plan view, and is formed so as to be accommodated in the housing 1 .

The substrate 2 is made of resin, for example, and has electronic components such as an input/output circuit, a communication circuit, a microcomputer, and a power supply circuit on its surface. The substrate 2 is formed with a plurality of mounting holes 21 into which a plurality of connection terminals 32 are press-fitted to form the pin header 30, and one through hole 22 through which a reference pin 14, which will be described later, is inserted.

The connector 3 is composed of a pin header 30 press-fitted into the substrate 2 and a connector housing portion 31 provided in the housing 1 . In the electronic device 100, the connector 3 is provided for electrically connecting the board 2 to an external device (not shown). A tubular connector housing portion 31 having an opening 33 and projecting outward is formed on the bottom surface 12 of the housing 1 . As shown in FIGS. 1 to 3, in this embodiment, the board 2 is formed with three pin headers 30, and the housing 1 is provided with three connector housing portions 31 corresponding to the respective pin headers 30. , three connectors 3 are configured. One ends of the plurality of connection terminals 32 forming the pin header 30 are press-fitted into the plurality of mounting holes 21 to be connected to the electric circuit formed on the substrate 2 , and the other ends of the connection terminals 32 are connected to the corresponding connector housing portion 31 . By exposing from the opening 33, the board 2 and an external device (not shown) can be electrically connected via the connector 3 (see FIG. 3).

As shown in FIGS. 1 and 2, the lid 4 is provided to cover the opening 11 of the housing 1. As shown in FIG. The lid body 4 and the housing 1 facing each other are provided with, for example, an engaging part (not shown) on one side and an engaged part (not shown) on the other side, and the lid body 4 is engaged with the engaging part. It is configured to be fixable to the housing 1 by engagement with the joint.

The housing 1 is made of, for example, PBT resin, and the lid 4 is made of, for example, aluminum, stainless steel, PBT resin, or the like. A reinforcing rib 12a is formed in a lattice on the bottom surface 12 of the housing 1. As shown in FIG. Further, on the bottom surface 12 of the housing 1, receiving ribs (not shown) with which the plate surface of the substrate 2 can come into contact are distributed.

As shown in FIGS. 2 and 4, the housing 1 has a peripheral wall 13 formed in a rectangular shape in plan view, and the peripheral wall 13 has four walls 13A to 13D at positions corresponding to sides of the rectangle. . The substrate 2 has, as the peripheral edge 2a, a first side portion 2A corresponding to the upper side portion, a second side portion 2B corresponding to the right side portion, a third side portion 2C corresponding to the lower side portion, in plan view shown in FIG. and a fourth side portion 2D corresponding to the left side portion. The four wall portions 13A to 13D of the peripheral wall 13 and the four side portions 2A to 2D of the peripheral edge 2a of the substrate 2 are arranged to form the first wall portion 13A and the first side portion when the substrate 2 is accommodated in the housing 1. 2A, the second wall portion 13B and the second side portion 2B, the third wall portion 13C and the third side portion 2C, and the fourth wall portion 13D and the fourth side portion 2D face each other. The first wall portion 13A and the first side portion 2A, the third wall portion 13C and the third side portion 2C extend along the X direction, the second wall portion 13B and the second side portion 2B, and the fourth side portion 13B extend along the X direction. The wall portion 13D and the fourth side portion 2D extend along the Y direction.

The housing 1 has a reference pin 14 erected from the bottom surface 12 and a plurality of pressing portions 15 protruding inward from the inner surface of the peripheral wall 13 . The reference pin 14 is formed at a position that can be inserted through a through hole 22 formed in the substrate 2 . Here, as shown in FIG. 4, of the X directions, the direction toward the fourth wall portion 13D and the fourth side portion 2D is the X1 direction, and the direction toward the second wall portion 13B and the second side portion 2B is the X2 direction. Among the Y directions, the direction toward the third wall portion 13C and the third side portion 2C is called the Y1 direction, and the direction toward the first wall portion 13A and the first side portion 2A is called the Y2 direction. A portion located in the X1 direction from the center of the housing 1 and the substrate 2 in plan view is called the X1 side, and a portion located in the X2 direction is called the X2 side. The portion located in the Y1 direction is called the Y1 side, and the portion located in the Y2 direction is called the Y2 side. In this embodiment, as shown in FIGS. 2 and 4, the reference pin 14 is arranged at a position on the bottom surface 12 near the fourth wall portion 13D on the X1 side in the X direction and on the Y2 side in the Y direction. there is The through-hole 22 of the substrate 2 is arranged on the X1 side of the first side portion 2A and on the Y2 side of the fourth side portion 2D, and is formed at a position corresponding to the reference pin 14 . The reference pin 14 is integrally formed with the housing 1, for example. The reference pin 14 may be made of a material (for example, metal) different from that of the housing 1 and may be embedded in the housing 1 .

The plurality of pressing portions 15 abut against a portion of the peripheral edge 2a of the substrate 2 accommodated in the housing 1 to press the substrate 2 inward of the peripheral wall 13 to apply a pressing force P. As shown in FIG. In this embodiment, the plurality of pressing portions 15 are provided one each on the second wall portion 13B and the third wall portion 13C among the four wall portions 13A to 13D. Specifically, one pressing portion 15a is provided on the inner surface of the second wall portion 13B, and one pressing portion 15b is provided on the inner surface of the third wall portion 13C. That is, the plurality of pressing portions 15 are arranged on the inner surfaces of the two non-parallel wall portions 13B and 13C. In this embodiment, the two walls 13B and 13C are orthogonal to each other.

As shown in FIG. 2, the pressing portion 15 is composed of crushing ribs. The pressing portion 15, which is a crushing rib, is erected from the bottom surface 12 and formed in a prism shape, and an inclined portion 16 directed inward of the peripheral wall 13 from the opening 11 toward the bottom surface 12 is provided on the upper portion of the opening 11 side. It is When the plurality of pressing portions 15 are composed of crushing ribs, the dimensional tolerance of the substrate 2 or the housing 1 can be easily absorbed according to the amount of crushing of the crushing ribs, and the substrate 2 is held in the housing 1. can be easily stabilized.

Next, a procedure for assembling the substrate 2 to the housing 1 will be described. The substrate 2 is inserted into the housing 1 through the opening 11 of the housing 1 and pressed toward the bottom surface 12 while the reference pins 14 are inserted through the through holes 22 of the substrate 2 . At that time, if the tip of the reference pin 14 is tapered, the reference pin 14 can be easily inserted into the through hole 22 of the substrate 2 .

The substrate 2 is fitted toward the bottom surface 12 while the peripheral edge 2a of the substrate 2 crushes the inclined portion 16 of the pressing portion 15 until it is placed on the receiving rib (not shown) after it is inserted through the reference pin 14. . FIG. 5 shows the substrate 2 placed on the receiving ribs. At this time, the plurality of pressing portions 15 (inclined portions 16 ) come into contact with part of the peripheral edge 2 a of the substrate 2 accommodated in the housing 1 and press the substrate 2 inward of the peripheral wall 13 . As shown in FIG. 4, the pressing force P1 by the pressing portion 15a provided inside the second wall portion 13B among the plurality of pressing portions 15 acts in the X1 direction, A pressing force P2 by the pressing portion 15b provided at 1 acts in the Y2 direction. Therefore, the resultant force P3 (=P1+P2) of the pressing force P1 and the pressing force P2 is a pressing force acting in one direction (upper left direction in FIG. 4).

The substrate 2 is accommodated in the housing 1 with the reference pin 14 inserted through the through hole 22 , and the resultant force P 3 of the pressing force P 1 and the pressing force P 2 acts on the reference pin 14 . Here, referring to FIG. 4, looking at the positional relationship between the reference pin 14 (through hole 22) and the plurality of pressing portions 15a and 15b, the reference pin 14 (through hole 22) presses the second wall portion 13B. It is located on the Y2 side of the portion 15a, and is located on the X1 side of the pressing portion 15b of the third wall portion 13C. If the reference pin 14 is provided at this position, a force (reaction force P4) of the same magnitude as the resultant force P3 and in the opposite direction can be applied from the reference pin 14 to the substrate 2. FIG. Therefore, the resultant force P3 of the pressing force P1 and the pressing force P2 does not act to rotate the substrate 2 around the reference pin 14, but acts so as to balance with the reaction force P4. Therefore, since the forces are balanced when the reference pin 14 and the substrate 2 are pressed against each other, the substrate 2 does not move with respect to the housing 1 and the held state is maintained.

Thus, the substrate 2 is positioned in the housing 1 while being pressed against the reference pins 14 by receiving the pressing forces P (P1, P2) from the plurality of pressing portions 15a, 15b. That is, since the resultant force P3 and the reaction force P4 are balanced while the substrate 2 accommodated in the housing 1 is in constant contact with the pressing portions 15a and 15b and the reference pin 14, the substrate 2 is less likely to be displaced. Therefore, it is possible to improve the positional accuracy of the substrate 2 arranged in the housing 1 . As a result, in the electronic device 100 of the present embodiment, the pin header 30 mounted on the board 2 can be aligned with the connector housing portion 31 provided on the housing 1 with high accuracy. Further, in the present embodiment, only the reference pin 14 provided in the housing 1, the plurality of pressing portions 15a and 15b provided in the housing 1, and the through hole 22 formed in the substrate 2 are used to adjust the housing. 1, the positioning structure of the substrate 2 can be realized with a simple configuration.

Further, by arranging the plurality of pressing portions 15a and 15b on the inner surfaces of the two non-parallel wall portions 13B and 13C of the peripheral wall 13, the plurality of pressing portions 15a and 15b press the substrate 2, respectively. A resultant force P3 of a plurality of acting pressing forces P1 and P2 is a pressing force that reliably acts in one direction. By providing the reference pin 14 at a position where the reaction force P4 to the resultant force P3 can be applied to the substrate 2, the resultant force P3 can be reliably applied to the reference pin 14 and the reaction force P4 from the reference pin 14 to the substrate 2 can be applied. can be applied to accurately position the substrate 2 with respect to the housing 1 . Further, since the plurality of pressing portions 15a and 15b can be arranged on the inner surfaces of at least two non-parallel wall portions 13B and 13C of the peripheral wall 13, the number of pressing portions 15 in the housing 1 can be reduced and the housing 1 can be can be simplified.

[Modification of First Embodiment]
As shown in FIGS. 6 and 7 , the plurality of pressing portions 15 may be configured by snap fits 18 formed by providing cuts 17 in the peripheral wall 13 on the side of the opening 11 . As shown in FIG. 6, two notches 17 forming snap fits 18 are provided in a straight line toward the bottom surface 12 . A snap fit 18 formed between the two cuts 17 has a rectangular parallelepiped pressing portion 19 protruding inwardly from the inner surface of the peripheral wall 13 on the opening 11 side. The pressing portion 19 has an inclined portion 19a extending toward the inner side of the peripheral wall 13 toward the bottom surface 12 on the side of the opening 11, a contact portion 19b continuing from the inclined portion 19a and extending in a direction perpendicular to the bottom surface 12, have

As shown in FIG. 7, the substrate 2 accommodated in the housing 1 and placed on receiving ribs (not shown) has its peripheral edge 2a contact the contact portion 19b of the snap fit 18 in the housing 1. It is kept in the same state. In this way, when the plurality of pressing portions 15 are configured by the snap-fits 18, the dimensional tolerance of the substrate 2 or the housing 1 can be easily absorbed according to the deformation amount of the snap-fits 18, and the housing 1 can be can easily stabilize the holding state of the substrate 2 in .

[Second embodiment]
In the first embodiment, as the plurality of pressing portions 15 in the housing 1, one pressing portion 15a is provided on the inner surface of the second wall portion 13B, and one pressing portion 15b is provided on the inner surface of the third wall portion 13C. However, as shown in FIG. 8, a plurality of pressing portions 15 may be provided on each of the inner surfaces of the second wall portion 13B and the third wall portion 13C. The second embodiment shown in FIG. 8 has a configuration in which the housing 1 and the substrate 2 do not have the connector 3, and the configuration other than the position of the reference pin 14 and the number of the pressing portions 15 is the same as in the first embodiment. It is the same. In the second embodiment, two pressing portions 15a1 and 15a2 are provided at intervals on the inner surface of the second wall portion 13B, and two pressing portions 15b1 and 15b2 are provided at intervals on the inner surface of the third wall portion 13C. It is

As shown in FIG. 8, the housing 1 is provided with reference pins 14 at the corners on the X1 side in the X direction and the Y2 side in the Y direction. 22 are formed. Also in the second embodiment, the peripheral edge 2a (the second side portion 2B and the third side portion 2C) of the substrate 2 is maintained until the substrate 2 is placed on receiving ribs (not shown) after the substrate 2 is inserted through the reference pins 14. is fitted to the bottom surface 12 side while crushing the pressing portion 15 . At this time, the inclined portions 16 of the plurality of pressing portions 15 come into contact with part of the peripheral edge 2a (the second side portion 2B and the third side portion 2C) of the substrate 2 housed in the housing 1, thereby pushing the substrate 2 into the peripheral wall. 13 is pressed inward. Of the plurality of pressing portions 15, the pressing force P1 by the pressing portions 15a1 and 15a2 provided inside the second wall portion 13B acts in the X1 direction, and the pressing force P1 provided inside the third wall portion 13C is applied. A pressing force P2 by the portions 15b1 and 15b2 acts in the Y2 direction. Therefore, the resultant force P3 of the pressing force P1 and the pressing force P2 is a pressing force acting in one direction.

In this way, the board 2 is accommodated in the housing 1 with the reference pin 14 inserted through the through hole 22 , and the resultant force P3 of the pressing force P1 and the pressing force P2 acts on the reference pin 14 . Here, referring to FIG. 8, looking at the positional relationship between the reference pin 14 (through hole 22) and the plurality of pressing portions 15a1, 15a2, 15b1, and 15b2, the reference pin 14 (through hole 22) It is located on the Y2 side of the intermediate position Q1 between the pressing portions 15a1 and 15a2 of the portion 13B, and is located on the X1 side of the intermediate position Q2 between the pressing portions 15b1 and 15b2 of the third wall portion 13C. If the reference pin 14 is provided at this position, a force (reaction force P4) of the same magnitude as the resultant force P3 and in the opposite direction can be applied from the reference pin 14 to the substrate 2. FIG. Therefore, the resultant force P3 of the pressing force P1 and the pressing force P2 does not act to rotate the substrate 2 around the reference pin 14, but acts so as to balance with the reaction force P4. Therefore, since the forces are balanced when the reference pin 14 and the substrate 2 are pressed against each other, the substrate 2 does not move with respect to the housing 1 and the held state is maintained.

Thus, also in the second embodiment, the substrate 2 is positioned in the housing 1 while being pressed against the reference pins 14 by receiving the pressing force P from the plurality of pressing portions 15 . That is, since the resultant force P3 and the reaction force P4 are balanced in a state in which the substrate 2 accommodated in the housing 1 is always in contact with the pressing portions 15a1, 15a2, 15b1, 15b2 and the reference pin 14, the substrate 2 is difficult to be displaced. Become. Therefore, it is possible to improve the positional accuracy of the substrate 2 arranged in the housing 1 .

[Third Embodiment]
In the first and second embodiments, an example in which one reference pin 14 is provided on the housing 1 is shown, but two reference pins 14 may be provided as shown in FIG. The third embodiment shown in FIG. 9 has the same configuration as the second embodiment except for the reference pin 14 and the through hole 22. As shown in FIG. In the third embodiment, the housing 1 is provided with two reference pins 14a and 14b, and the substrate 2 is provided with a first through hole 22a through which the first reference pin 14a is inserted and a second reference pin 14b. and a second through hole 22b are formed. The first through hole 22a is arranged on the X1 side and near the first side portion 2A on the Y2 side, and is formed in an oval shape extending along the X direction. The second through-hole 22b is arranged in the vicinity of the center in the Y direction near the fourth side 2D on the X1 side, and is formed in an oval shape extending along the Y direction. This facilitates insertion of the reference pins 14a and 14b into the through holes 22a and 22b.

In this embodiment, the substrate 2 is housed in the housing 1 with the first reference pin 14a inserted through the first through hole 22a and the second reference pin 14b inserted through the second through hole 22b. A pressing force P1 by the portions 15a1 and 15a2 can be applied to the second reference pin 14b, and a pressing force P2 by the pressing portions 15b1 and 15b2 can be applied to the first reference pin 14a. If the first reference pin 14a is provided at this position, a force (reaction force P5) having the same magnitude as the pressing force P2 and in the opposite direction can be applied from the first reference pin 14a to the substrate 2. FIG. Further, if the second reference pin 14b is provided at this position, a force (reaction force P6) having the same magnitude as the pressing force P1 and in the opposite direction can be applied to the substrate 2 from the second reference pin 14b. As a result, the movement of the substrate 2 in the direction along the bottom surface 12 is restricted by the plurality of pressing portions 15 and the two reference pins 14a and 14b inside the housing 1, so that the substrate 2 can be accurately positioned inside the housing 1. can.

Two reference pins 14 a and 14 b are provided in the housing 1 as the reference pins 14 , and two through holes 22 a and 22 b are formed in the substrate 2 as the through holes 22 through which the reference pins 14 are inserted. And the durability of the through-holes 22 can also be improved.

[Other embodiments]
(1) In the above embodiment, an example in which the peripheral wall 13 of the housing 1 is formed in a rectangular shape in plan view is shown, but the shape of the peripheral wall 13 of the housing 1 is not limited to a rectangular shape in plan view. A polygonal shape such as a triangle or a pentagon or more may be used. Moreover, the plurality of pressing portions 15 may be arranged on the inner surfaces of at least two non-parallel wall portions of the peripheral wall 13 .

By forming the peripheral wall 13 of the housing 1 into a polygonal shape in a plan view, it becomes easy to accommodate the polygonal substrate 2 in the housing 1 . Further, when the plurality of pressing portions 15 are arranged on the inner surfaces of at least two non-parallel wall portions of the peripheral wall 13 , the plurality of pressing portions 15 press the substrate 2 to generate a plurality of pressing forces P is a pressing force that acts in one direction and does not become zero. Therefore, the resultant force can be reliably applied to the reference pin 14 to accurately position the substrate 2 . In addition, since the plurality of pressing portions 15 may be arranged on the inner surfaces of at least two non-parallel wall portions of the peripheral wall 13, the number of pressing portions 15 provided on the peripheral wall 13 of the housing 1 can be reduced. The shape can also be simplified. When the shape of the peripheral wall 13 of the housing 1 is a polygonal shape of a pentagon or more, the resultant force of the plurality of pressing forces P applied to the substrate 2 by each of the plurality of pressing portions 15 acts in one direction. If so, the plurality of pressing portions 15 may be arranged on the inner surfaces of three or more non-parallel wall portions of the peripheral wall 13 .

(2) In the above-described embodiment, the reference pin 14 formed in the housing 1 has a columnar shape. good too.

(3) In the above embodiment, as the plurality of pressing portions 15, one or two pressing portions 15a (15a1, 15a2) are provided on the inner surface of the second wall portion 13B, and one pressing portion 15a (15a1, 15a2) is provided on the inner surface of the third wall portion 13C. Alternatively, although an example in which two pressing portions 15b (15b1, 15b2) are provided has been shown, three or more pressing portions 15 may be arranged on the inner surfaces of the second wall portion 13B and the third wall portion 13C. A different number of pressing portions 15 may be arranged on the inner surfaces of the portion 13B and the third wall portion 13C.

(4) In the above embodiment, the board 2 is a circuit board made of resin. In the first embodiment, the case 1 is provided with the connector housing portion 31 and the board 2 is press-fitted with the pin header 30 as the connector 3 . may be in the form

INDUSTRIAL APPLICABILITY The present invention can be widely used in positioning various substrates with respect to a housing.

1: housing 2: circuit board (substrate)
2a: peripheral edges 2A, 2B, 2C, 2D: side portion 3: connector 4: cover 11: opening 12: bottom surface 13: peripheral wall 13a: end portions 13A, 13B, 13C, 13D: wall portion 14: reference pin 15: pressure Portions 15a, 15a1, 15a2: Pressing portions 15b, 15b1, 15b2: Pressing portion 16: Inclined portion 17: Notch 18: Snap fit 19: Pressing portion 19a: Inclined portion 19b: Contact portion 22: Through hole 31: Connector housing portion 100: electronic devices P, P1, P2: pressing force P3: resultant force

Claims (4)

a substrate;
a resin housing in which the substrate is housed,
The housing includes an opening into which the substrate can be inserted, a bottom surface facing the opening, a peripheral wall erected from a peripheral edge of the bottom surface, a reference pin erected from the bottom surface, and an inner surface of the peripheral wall. a plurality of pressing parts protruding in the direction, contacting a part of the peripheral edge of the substrate housed in the housing and pressing the substrate inwardly of the peripheral wall to apply a pressing force; have
the substrate has a through hole through which the reference pin is inserted;
In a state in which the reference pin is inserted through the through hole and the substrate is accommodated in the housing, a resultant force of the plurality of pressing forces applied by the plurality of pressing portions acts on the reference pin. positioning structure. 2. The substrate positioning structure according to claim 1, wherein the plurality of pressing portions are composed of crushing ribs. 2. The substrate positioning structure according to claim 1, wherein the plurality of pressing portions are configured by snap-fits formed by providing cuts in the peripheral wall on the side of the opening. The peripheral wall of the housing is polygonal in plan view,
The substrate positioning structure according to any one of claims 1 to 3, wherein the plurality of pressing portions are arranged on the inner surfaces of at least two non-parallel wall portions of the peripheral wall.

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