JP2011181635A - Circuit module and method of manufacturing the same, and case and printed board used therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a circuit module having a mounting structure which is simple and easy to mount. <P>SOLUTION: The circuit module includes a case 10 and printed boards 20 and 30 locked at a predetermined height in the case 10 with ribs provided on case inner walls 15, wherein the ribs are provided in at least two stages on the case inner walls 15, the ribs arranged in each stage are arranged at positions of rotational symmetry, and the printed boards 20 and 30 have recesses 22 and 23 at peripheral edges corresponding to the positions of the ribs so that at least ribs of one stage can be inserted. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a circuit module, a manufacturing method thereof, a case used for the circuit module, and a printed board.

A circuit module in which a printed circuit board on which electronic components are mounted is housed in a case has been proposed (for example, Patent Document 1).
The electronic device of Patent Document 1 is configured to support the lower surface and the upper surface of the printed circuit board by ribs formed on the inner wall of the case, and fixes the printed circuit board in the case without using screws, studs, or the like. It can be formed without impairing the appearance.

JP 2009-260051 A

However, according to this configuration, when two or more printed boards are required, it is necessary to change the outer shape and design and manufacture the pattern. For this reason, there is a problem that an external die is required for each, and the initial investment amount is increased.
In particular, when two or more printed circuit boards are used in an overlapping manner, it is difficult to install them in a stepped manner with ribs on the case side, and there has been no choice but to take a method such as using spacers.

  Therefore, the present invention has been made in view of the above circumstances, and an object thereof is to provide a circuit module having a mounting structure that is simple in structure and easy to mount.

In order to solve the above problems, a circuit module of the present invention is a circuit module comprising a case and a printed circuit board that is locked at a predetermined height in the case by a rib provided on the inner wall of the case. Is provided in at least two steps of the inner wall of the case, the ribs arranged in each step are arranged in rotationally symmetric positions, and the printed circuit board has concave portions on the peripheral edge corresponding to the positions of the ribs, It is configured to be able to pass through at least one rib.
According to the present invention, the printed circuit board is arranged in a plurality of stages in the circuit module.
According to the present invention, in the circuit module, the printed board can be inserted through the rib along the inner wall of the case by rotating 180 degrees.
Further, according to the present invention, in the above circuit module, the inner wall of the case has a square cross section, and the positions of the ribs at each stage are arranged with the phase shifted by 90 degrees.
Further, according to the present invention, in the above circuit module, the inner wall of the case has a circular cross section, and the positions of the ribs of each step are arranged with the phase shifted by a predetermined angle.

The case of the present invention includes a support wall that supports the periphery of the printed circuit board, and a rib that is provided on at least two stages of the inner wall of the support wall and that locks at least a part of the periphery of the printed circuit board. Are provided in at least two steps of the inner wall of the case, and the positions of the ribs arranged in each step are rotationally symmetric.
Further, according to the present invention, in the above case, the ribs are arranged so as to be point-symmetric, and the printed board can be displaced along the inner wall of the case by rotating 180 degrees.
Further, according to the present invention, in the case described above, the inner wall of the case has a square cross section, and the positions of the ribs of each step are arranged with a phase shifted by 90 degrees.
Further, according to the present invention, in the case described above, the inner wall of the case has a circular cross section, and the positions of the ribs of each step are arranged with the phase shifted by a predetermined angle.

In addition, the printed circuit board of the present invention is configured in a rotationally symmetric shape, and has first and second recesses in the peripheral portion, and the first and second recesses are provided avoiding rotationally symmetric positions.
In the printed circuit board, the present invention is configured to have a rotationally symmetric shape, and has first and second concave portions at the peripheral portion, and the first concave portion and the second concave portion are complementary at a rotationally symmetric position. Formed to make a shape.
In the printed circuit board according to the present invention, the printed circuit board is formed of a square substrate, and the first and second recesses are arranged with a phase shifted by 90 degrees.

In the circuit module manufacturing method of the present invention, in the printed circuit board, the inner wall of the case has a circular cross section, and the first and second recesses are arranged with a phase shifted by a predetermined angle.
Further, the present invention is provided in at least two steps of a support wall for supporting the peripheral edge of the printed circuit board and an inner wall of the support wall so that the positions in the respective stages are rotationally symmetric, and at least a part of the peripheral edge of the printed circuit board is provided. A step of preparing a case having a rib to be locked, and first and second recesses in the peripheral portion, and the first recess and the second recess have complementary shapes at rotationally symmetric positions. Prepare the printed circuit board formed in this way and the rib provided on the inner wall of the case, rotate the printed circuit board and avoid one of the ribs with the second recess until it reaches the desired step rib A step of causing the printed circuit board to reach the first recess and locking the printed circuit board at a predetermined height in the case, and the printed circuit board is installed at a desired stage in the case.

  According to the circuit module of the present invention, since it is possible to use printed circuit boards having the same outer shape, the initial investment can be reduced. Moreover, since it can be mounted only at a specific position, manufacturing errors can be reduced.

1 is an exploded perspective view of a circuit module according to a first embodiment. It is a figure which shows the printed circuit board used for the circuit module of Embodiment 1, (a) is a 1st printed circuit board, (b) is a figure which shows a 2nd printed circuit board. The perspective view of the circuit module of Embodiment 1 The perspective view of the circuit module of Embodiment 1 The perspective view of the circuit module of Embodiment 1 It is a figure which shows the modification of a printed circuit board, (a) thru | or (d) is explanatory drawing which shows the direction of the printed circuit board installed in each step | paragraph, and the position of a recessed part Upper surface explanatory drawing of the circuit module of Embodiment 2. FIG. The figure which shows the printed circuit board used for the circuit module of Embodiment 2. Main part explanatory drawing which shows the case inner wall used for the circuit module of Embodiment 2

(Embodiment 1)
FIG. 1 is an exploded perspective view of the circuit module according to the first embodiment. This circuit module constitutes a relay. FIGS. 2A and 2B are views showing first and second printed circuit boards used in this circuit module. 3 to 5 are perspective views of the circuit module. FIG. 3 shows a state where the lid 50 is removed, FIG. 4 shows a state where the second printed circuit board 30 is removed, and FIG. 5 shows a state where the lid 50 is arranged. Indicates.

  This circuit module includes a resin case 10 having a square cross section and ribs (121a, 121b, 122, 123, 124a, 124b, 131a, 131b, 132, 133, 134a, 134b) provided on the inner wall 15 of the case: FIG. The reference numerals of the invisible parts are omitted, the first-stage ribs are 120, and the second-stage ribs are 130). (First and second printed circuit boards 20, 30). The ribs 120 and 130 are provided in two steps on the case inner wall 15, and two and one ribs are arranged at opposing positions so that the ribs arranged in each step become rotationally symmetric by rotating 180 degrees. Individually arranged. The first and second printed circuit boards 20 and 30 are configured so as to have a concave portion at the peripheral edge corresponding to the position of the rib and to be able to pass through at least one rib. That is, the first and second printed circuit boards 20 and 30 are made of a rectangular APS resin substrate having the same shape that is rotationally symmetric by rotating 180 degrees, and has a wiring pattern on the surface and a desired chip component (not shown). ) Is installed.

  As shown in FIG. 2A, the printed circuit board 20 includes two notch-shaped recesses 21a and 21b arranged at the center of the long side as the first recesses along the periphery. As the recess, one notch-shaped recess 23 provided at the center of the side opposite to the long side is provided. Further, as the third recess, the phase is shifted by 90 degrees from the first recess, and two notch-shaped recesses 24a and 24b arranged at the center of the short side, and the fourth recess, It has one notch-like recess 22 provided at the center of the side facing the short side. Further, the second printed circuit board 30 has the same shape as the first printed circuit board 20, and only the circuit pattern is different.

  That is, as shown in FIG. 2 (b), the second printed circuit board 30 includes two pieces arranged at the center of the long side as the first concave portion along the periphery, like the first printed circuit board 20 described above. Notch-like recesses 31a and 31b and a second notch have one notch-like recess 33 provided at the center of the side facing this long side. Further, as the third recess, the phase is shifted by 90 degrees from the first recess, two notch-shaped recesses 34a and 34b arranged at the center of the short side, and the fourth recess, It has one notch-like recess 32 provided at the center of the side facing the short side. Here, for example, the first concave portions 31a and 31b and the second concave portion 33 are arranged avoiding rotationally symmetric positions so as not to be rotationally symmetric, and the opposing sides are complementary to each other. Here, the first recess and the second recess are provided in different numbers such as two and one, avoiding rotationally symmetric positions. With this configuration, while the outer shape is locked by rotation, the first and second recesses are inserted into the corresponding ribs at the corresponding positions, and the rotation further surrounds the second and first recesses. Is locked to the corresponding ribs.

  The first and second printed circuit boards 20 and 30 are locked at predetermined steps by ribs 120 and 130 provided on the inner wall 15 of the case 10. On the other hand, the first and second printed circuit boards 20 and 30 can be displaced beyond the ribs 120 and 130 along the inner wall of the case by rotating 180 degrees.

  The ribs are arranged in alignment with the recesses on the periphery of the first and second printed circuit boards 20 and 30. The upper second ribs 131a and 131b, 132, (133, 134a and 134b) are arranged in alignment with the recesses 31a and 31b, 32, 33, 34a and 34b on the periphery of the second printed circuit board 30. Has been. On the other hand, the first printed circuit board is formed by the peripheral recesses 21a and 21b, 22, 23, 24a and 24b of the first printed circuit board 20 which are arranged by rotating 180 degrees with respect to the peripheral recess of the second printed circuit board 30. 20 passes through the upper rib and is locked by the lower first rib. For example, the rib (121a, 121b) locks the (projecting) region R2 surrounding the recess 22 of the first printed circuit board. The first-stage rib is rotated 180 degrees with respect to the second-stage rib. Further, the rib (123) locks the (projecting) region R4 surrounding the recesses 24a and 24b of the first printed circuit board.

  That is, the first-stage ribs are arranged as follows. Of the second-stage ribs, the ribs 123 are arranged so as to be located in the middle of both the 131a and 131b. And it arrange | positions in the position rotated 90 degree | times sequentially like (124a and 124b) and (121a and 121b, 122) clockwise.

  On the other hand, the second printed circuit board 30 is locked by the second-stage rib that is the upper stage. For example, the region R2 surrounding the recess 32 of the second printed circuit board is locked by the ribs 131a and 131b. Also, the region R4 surrounding the recesses 34a and 34b of the second printed circuit board is locked by the rib 132. The region R1 surrounding the recesses 31a and 31b of the second printed circuit board is locked by the rib (133). Further, the region R3 surrounding the concave portion 33 of the second printed circuit board is locked by the ribs (134a and 134b).

  The first and second printed circuit boards 20 and 30 are locked at desired positions. Although the first and second printed circuit boards 20 and 30 are arranged at positions rotated by 180 degrees, the outer shape is the same.

  In this way, the first and second printed circuit boards 20 and 30 having the same outer shape, each having the desired circuit pattern, and mounting the electronic components are mounted in the case 10, and the desired positions are formed by the ribs. Can be locked to. Reference numeral 17 denotes a terminal cover. A terminal 40 having a contact piece 41 at the tip and having a mounting hole 42 is mounted, and the terminal cover 17 is mounted thereon. Here, 60 is a switching element mounted on the second printed circuit board 30, and the main body 61 is placed on the second printed circuit board 30, and a wiring portion ( (Not shown). The terminal 40 is fixed by screws 70 with screws. Reference numerals 25 and 35 denote screw holes for fixing the printed circuit board to the case.

  According to this configuration, since the outer shape of the printed circuit board can be unified, the initial investment can be reduced. In addition, the first and second printed circuit boards cannot be locked if they are in different directions, and can be mounted only in a specific direction, so that manufacturing errors can be reduced.

  At the time of manufacture, the case 10 is formed by injection molding of APS resin. The case includes a support wall that supports the periphery of the printed circuit board, and a rib that is provided in at least two stages of the inner wall of the support wall and that locks at least a part of the periphery of the printed circuit board. The positions of the ribs provided in at least two steps of the inner wall and arranged in each step are rotationally symmetric.

  On the other hand, by press molding, a printed circuit board is prepared which has a first recess at the periphery and is provided with a second recess while avoiding the rotationally symmetric position of the recess. Then, a desired wiring pattern is formed and electronic components such as the switching element 60 are mounted.

  Then, the printed circuit boards 20 and 30 are printed by rotating the printed circuit board with ribs provided on the inner wall of the case 10 and avoiding one of the ribs with the second recess until reaching the desired step rib. The substrate reaches the first recess and is locked at a predetermined height in the case.

  In this way, the printed boards 20 and 30 can be mounted in the case 10 at desired positions. By engaging and avoiding the rib and the first and second recesses, the printed circuit board can be efficiently installed at a desired stage in the case.

In the first embodiment, the first and second printed circuit boards 20 and 30 are rectangular in shape, and one of the first and second printed circuit boards 20 and 30 is rotated by 180 degrees to individually Although it is configured to be able to be locked, when it is a square, it is not limited to 180 degree rotation, and may be 90 degree rotation and 270 degree rotation. As shown in FIG. 6, when the printed circuit boards 20a, 20b, 30a, 30b are square, even when they are arranged in four stages, positioning can be performed by rotation with the same outer shape. FIGS. 6A to 6D are explanatory diagrams showing the orientation of the printed circuit boards installed at each stage and the positions of the recesses. In this case, the inner wall of the case also has a square cross section, and the positions of the ribs at each step are arranged with the phase shifted by 90 degrees.
The rest of the configuration is the same as that of the circuit module according to the first embodiment, and a description thereof is omitted here.

Furthermore, the number of ribs may be greater than the number of printed boards, and the printed boards may be arranged on a desired stage as necessary.
The number and position of the first and second recesses can be changed as appropriate. By configuring with a rotationally symmetric body and rotating the first and second recesses at different positions, positioning and locking in a specific direction is possible. That is, the printed circuit board has a rotationally symmetric shape, and has first and second recesses on the peripheral edge. The first recess and the second recess are preferably formed in a complementary shape at a rotationally symmetric position, but are configured in a rotationally symmetric shape, and the first and second recesses are formed on the peripheral edge. The first and second recesses may be provided so as to avoid rotationally symmetric positions. Thereby, it can comprise so that it may pass through a rib or may be latched by a rib by rotation.

  The first recess and the second recess formed on the printed circuit board are formed so as to have complementary shapes at rotationally symmetric positions, so that the number of recesses can be reduced as much as possible, and the effective area ratio of the printed circuit board is increased. There is a further effect that can be achieved.

(Embodiment 2)
In the circuit module according to the second embodiment, as shown in a schematic top view in FIG. 7, the inner wall 115 of the case 110 has a circular cross section, and the positions of the ribs 111 at each stage are shifted in phase by a predetermined angle. The
As shown in FIG. 8, the printed circuit board 150 used here has a disk shape, and is formed with notched concave portions 151, 152, 153, and 154 at the peripheral edge portion.
In accordance with the arrangement pitch of the recesses 151, 152, 153, and 154, ribs 111 are provided on the inner wall 115 of the case 110 as shown in FIG.

A clearance C is provided between the ribs 111 of each step, and the printed board 150 is formed to be rotatable with respect to the inner wall by floating the printed board 150 along the inner wall of the case. This clearance C needs to be larger than the thickness t of the printed board. Thereby, the printed circuit board can be freely rotated at the position of the clearance C, and after the rotation, the rib on the inner wall of the case can be inserted (passed) or can be locked to the rib.
According to this configuration, since the rotation angle can be continuously selected, a multistage installation is possible within the critical value for forming the recess.

  In addition, a part of the rib is made conductive so that an electrical connection is realized between the peripheral portion of the printed circuit board 150 and the rib on the inner wall of the case 110, thereby eliminating the need for a terminal for connection to the board. Thus, it becomes possible to simplify the components.

  It should be noted that making the rib conductive can be applied to both the first and second embodiments. In particular, when the ribs are formed in a plurality of stages and the printed boards are installed in a plurality of stages, the electrical connection between the printed boards is also an important problem. By installing a plurality of stages in the case as in this embodiment, the apparatus can be reduced in size and functionality. Further, the circuit module can be further reduced in size by forming the ribs with conductive members and using them for electrical connection between the printed boards or terminals provided on the case with a connector function.

  This is particularly effective for circuit modules that require accuracy in position and direction, such as a printed circuit board on which an acoustic sensor is mounted and a circuit module that uses a printed circuit board on which a gyro sensor or a pressure sensor is mounted.

  In any of the first and second embodiments, the case is preferably made of PBT resin, APS resin, or the like, and can be easily formed only by correcting a part of the mold.

  In addition, it is possible to use printed circuit boards having the same shape, and it is effective for a small variety of products by configuring the mounting stages of the printed circuit boards to be selectable.

10, 110 Case 20, 30, 150 Printed circuit board 120 (121a, 121b, 124a, 124b, 122, 123) Rib 130 (131a, 131b, 134a, 134b, 132, 133) Rib 21a, 21b First recess 22 First Two recesses 23 Third recesses 24a and 24b Fourth recess 40 Terminal 50 Lid 60 Switching element 70 Screw

Claims (14)

Case and
A circuit module comprising a printed circuit board locked at a predetermined height in the case by a rib provided on the inner wall of the case,
The rib is provided in at least two steps of the inner wall of the case,
The ribs arranged at each stage are arranged at rotationally symmetric positions,
The printed circuit board includes a recess in a peripheral edge corresponding to the position of the rib, and is configured to be able to pass through at least one rib. The circuit module according to claim 1,
The printed circuit board is a circuit module arranged in a plurality of stages. The circuit module according to claim 1 or 2, wherein
The printed circuit board can be inserted through the rib along the inner wall of the case by rotating 180 degrees. The circuit module according to claim 3, wherein
The circuit module in which the inner wall of the case has a square cross section, and the positions of the ribs of the respective steps are arranged with a phase shifted by 90 degrees. The circuit module according to claim 3, wherein
The circuit module in which an inner wall of the case has a circular cross section, and the positions of the ribs of the respective steps are arranged with a phase shifted by a predetermined angle. A support wall that supports the periphery of the printed circuit board;
A rib provided on at least two stages of the inner wall of the support wall and locking at least a part of the peripheral edge of the printed circuit board;
The case where the position of the rib arranged in each step is rotationally symmetric. The case according to claim 6,
The ribs are arranged to be point symmetric,
A case configured to be able to displace the printed circuit board along the inner wall of the case by rotating 180 degrees. The case according to claim 7,
A case in which an inner wall of the case has a square cross section, and the positions of the ribs in each step are arranged with a phase shifted by 90 degrees. The case according to claim 7,
A case in which an inner wall of the case has a circular cross section, and the positions of the ribs in the respective steps are arranged with a phase shifted by a predetermined angle. Composed of rotational symmetry,
The peripheral portion has first and second recesses,
The printed circuit board in which the first and second recesses are provided avoiding rotationally symmetric positions. Composed of rotational symmetry,
The peripheral portion has first and second recesses,
The printed circuit board, wherein the first recess and the second recess are formed in a complementary shape at a rotationally symmetric position. The printed circuit board according to claim 10 or 11,
A printed circuit board comprising a square substrate, wherein the first and second recesses are arranged 90 degrees out of phase. The printed circuit board according to any one of claims 10 to 12,
An inner wall of the case has a circular cross section, and the first and second recesses are arranged with a phase shifted by a predetermined angle. A support wall that supports the periphery of the printed circuit board;
Preparing a case provided on at least two steps of the inner wall of the support wall so that positions in each step are rotationally symmetric, and ribs that lock at least a part of the periphery of the printed circuit board;
Providing a printed circuit board having first and second recesses in a peripheral portion, wherein the first recess and the second recess have a complementary shape at a rotationally symmetric position;
The printed circuit board is rotated by a rib provided on the inner wall of the case, and one of the ribs is avoided by the second concave portion until the rib reaches a desired step, and the printed circuit board is moved to the first step. Reaching the recess and locking it at a predetermined height in the case,
A method for manufacturing a circuit module, wherein the printed circuit board is installed at a desired stage in the case.

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