JP2007287826A - Circuit board fixing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a circuit board fixing structure which has a good workability and can save space on a circuit board. <P>SOLUTION: In one circuit board 2, bushes 12 and spacer members 11 hold installation holes in between from up and down, and a leg portion of each bush 12 is fixed in such a state that it is inserted and locked in a screw through hole of the spacer member 11. The circuit board 2 and other circuit board 1 are fixed in such a state that they are stacked up and down by first aligning the installation holes formed in the circuit boards 1 and 2 and screw holes 21b of installation portions 21a formed on a base 21 and then inserting screws 15 from above the bushes 12 fixed on the circuit board 2 and threading them into the screw holes 21b of the installation portions 21a. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a circuit board mounting structure in which two circuit boards are stacked at a predetermined interval and fixed to a base.

  Conventionally, resin or metal spacers are used to assemble two substrates into a casing while maintaining a predetermined interval. Patent Document 1 describes a structure in which two substrates are assembled to a housing by mounting spacers between the substrates and screwing.

  FIG. 9 is an explanatory view of a conventional circuit board mounting structure and is a partial sectional view showing a state in which two circuit boards are assembled to a chassis.

  In this mounting structure, two circuit boards are connected by a member called a locking spacer 101, and the mounting part between the lower circuit board 102 and the chassis 105 is located at a position closer to the end of the circuit board than the connecting part by the locking spacer 101. 105a is screwed.

The locking spacer 101 moves the lower circuit board 102 up and down in cooperation with the protrusion 101a that fits into the mounting hole 103a of the upper circuit board 103, the body 101b, the leg 101c, and the leg 101c. The protrusion 101a is elastically deformed in order from the lower part of the circuit board 102 to the mounting holes 102a and 103a of the lower board 102 and the upper board 103 in this order. When the projection 101a protrudes from the mounting hole 103a of the upper substrate 103 and the leg 101c is elastically deformed and penetrates from the mounting hole 102a of the lower substrate 102, the lower substrate 102 and the upper substrate 103 are respectively locked. Fits with the spacer 101, and both substrates 102 and 103 are firmly connected in a state where a predetermined distance is maintained. It is.
JP 2000-165068 A

  However, in this type of circuit board mounting structure, it is necessary to perform both operations of connecting the substrates with the spacers 101 and mounting the substrates with screws, which requires a lot of work time as a whole. In particular, it may take time to elastically fit the resin protrusion 101 a into the holes 102 a and 103 a of the substrates 102 and 103. Further, once the protrusion 101a is fitted into the mounting hole 103a, it is very difficult to remove.

  In the case of FIG. 9, since it is necessary to secure a screwing work space above the screw attachment portion, the upper circuit board 103 secures an upper space S of the screw mounting hole 103b of the lower circuit board 102. Must be placed. That is, the upper circuit board 103 must be smaller than the lower circuit board 102, and the mounting space for electronic components on the upper board 103 is limited. The mounting space of the lower circuit board 102 is also limited by the mounting hole 102a and the screw hole 102b of the spacer 101. Furthermore, since there are two connecting portions, there is a problem of mechanical strength.

  The present invention has been proposed in order to solve such a problem, and an object of the present invention is to provide a circuit board mounting structure that has good mounting workability and can save space on the circuit board. .

  In order to achieve the above object, the circuit board mounting structure according to claim 1 is characterized in that two circuit boards each having a mounting hole corresponding to each other are formed at a predetermined interval by using screw penetration spacers. A circuit board mounting structure fixed to a base in a state of being arranged in parallel, the screw penetration spacer has a screw, a spacer member in which a screw penetration hole is formed, and a leg portion, and the screw penetration hole is formed. In combination with the bush, the leg is inserted and locked into the screw through hole of the spacer member.In one circuit board, the bush and the spacer member sandwich the mounting hole from above and below, The leg portion of the bush is fixed in a state of being inserted and locked into the screw through hole of the spacer member, and the one circuit board and the other circuit board are mounting holes formed in both circuit boards, Screw mounting holes on the mounting part provided on the base Furthermore, the screw is inserted from above the bush fixed to the one circuit board and screwed into the screw mounting hole of the mounting portion, so that it is fixed in a state of being arranged in parallel at a predetermined interval. It is characterized by.

  According to a second aspect of the present invention, the spacer member is provided with a conductive portion that contacts a ground conductive portion formed on each of the two circuit boards arranged in parallel at a predetermined interval.

  According to a third aspect of the present invention, the upper and lower ends of the spacer member are formed larger than the middle part of the body.

  According to a fourth aspect of the present invention, each of the two circuit boards arranged in parallel with a predetermined distance is provided with a corresponding direct connector.

  According to a fifth aspect of the present invention, the mounting hole of the other circuit board is provided with an opening that opens to the end side of the circuit board.

  According to the mounting structure of the circuit board according to claim 1, since the screw penetrating spacer comprising the screw, the bush and the spacer member is used, the bush and the spacer member can be temporarily fixed to the upper circuit board from above and below. When aligned with the lower circuit board, the screw through hole communicates from the bush to the mounting portion of the base and can be easily screwed. Therefore, the spacer can be attached and screwed by a series of operations, so that the workability is very good.

  Furthermore, since the mounting position of the spacer member and the screwing position are the same location, it is not necessary to provide two types of mounting holes for the spacer and screwing in the lower circuit board, and the electronic component mounting space on the board is reduced. Many can be secured. In addition, since the screw is penetrated in a state where two circuit boards are stacked, it is not necessary to use an upper circuit board having a small area in order to secure a screwing space as in the prior art. The same size can be stacked according to the size of the circuit board, so that a lot of mounting space can be secured.

  According to the circuit board mounting structure of the second aspect, since the conductive portion that contacts the ground conductive portion formed on each of the two circuit boards arranged in parallel at a predetermined interval is provided. Both of the conductive parts for grounding can be connected, and the upper circuit board can be grounded to the base through the lower circuit board.

  According to the circuit board mounting structure of the third aspect, since the upper and lower ends of the spacer member are formed larger than the center part of the body, the support of the circuit board is stabilized. Further, since the grounding through the conductive portion of the spacer member has such a shape, the contact surface with the circuit board becomes large, and sufficient energization contact can be performed.

  According to the circuit board mounting structure according to claim 4, since the direct attachment connector corresponding to the two circuit boards is provided, the two circuit boards can be connected in advance, and the connected state Since it can be screwed to the base, it can be more efficiently attached to the base.

  According to the circuit board mounting structure of claim 5, since the opening is continuously formed in the mounting hole of the other (lower) circuit board, when the circuit board is placed on the base However, it is possible to see through the mounting portion, so that positioning is easy and workability is good.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a partial perspective view showing a circuit board mounting structure of the present invention, FIG. 2 is an exploded perspective view, and FIG. 3 is a partial cross-sectional view showing a mounted state. In addition, it is desirable to perform attachment to a base at four corners of a circuit board, FIG. 1 illustrates two of them, and FIG. 2 and FIG. 3 illustrate one attachment structure.

  In the figure, 21 is a base such as a chassis, 21a is a mounting portion formed on the base 21 and having a screw mounting hole 21b for mounting and fixing a circuit board, 1 is a lower circuit board, and 2 is an upper stage 1a is a mounting hole of the lower circuit board 1, 1b is an opening formed by cutting out the end portion connected to the mounting hole 1a, 2a is a mounting hole of the upper circuit board 2, and 11 is a screw penetration A spacer member having a hole 11a, 12 a bush having a screw through hole 12a and a leg 12c, 15 a screw for fixing to the base 21, and 10 a spacer member 11, a bush 12 and a screw 15. The screw through spacers 23 and 24 are direct connectors arranged so as to face each other and be electrically connected when the two circuit boards 1 and 2 are stacked.

  Here, the spacer member 11 is entirely energized so as to be energized from the conductive portions 11f and 11e contacting the mounting holes 1a and 2a of the two circuit boards 1 and 2 stacked vertically in parallel at a predetermined interval. It is desirable to form a conductive material such as metal, resin-coated metal, or resin mixed with conductive particles such as carbon powder. The circuit boards 1 and 2 are provided with ground conductive portions 1c and 2b that are connected to the mounting portion 21a of the base 21 and are grounded around the mounting holes 1a and 2a.

  Since the spacer member 11 is provided with conductive portions 11f and 11e that are in contact with the ground conductive portions 2b and 1c of the two circuit boards 2 and 1 stacked above and below, both the ground conductive portions 2b, 1 c can be connected, and the upper circuit board 2 can be grounded to the base 21 through the lower circuit board 1.

  Further, the mounting portion 21a on the base 21 is formed in a truncated cone shape by burring, and the screw mounting hole 21b projects a screw hole (a tapped hole having a thread groove) at the top portion of the mounting portion 21a. It was established in the opposite direction. According to such a burring process, many (deep) thread grooves can be formed.

  Alternatively, a method may be employed in which a simple hole that is not a screw hole is formed instead of a screw hole, and the screw groove is cut when the screw 15 is screwed. In addition, since the present Example shows the example of a screw hole, below, a screw attachment hole is described as a screw hole.

  Although a nut may be used, it is desirable to screw it by the above method in order to shorten the mounting time.

  Next, a procedure for attaching and fixing the two circuit boards 1 and 2 to the base 21 will be described.

  First, the mounting hole 2 a of the upper circuit board 2 is sandwiched between the bush 12 and the spacer member 11 from above and below, and the leg portion 12 c of the bush 12 is inserted and locked into the screw through hole 11 a of the spacer member 11. And temporarily fix. The connection structure between the bush 12 and the spacer member 11 and the configuration of each member will be described later with reference to FIG.

  Next, the upper circuit board 2 on which the bush 12 and the spacer member 11 are temporarily fixed and the circuit board 1 are connected by the directly attached connectors 24 and 23 provided on both the boards 2 and 1, and the connected circuit board 1 is connected. The two corresponding mounting holes 1a, 2a and the screw holes 21b of the mounting portion 21a of the base 21 are aligned with each other, and the screw 15 is inserted from above the bush 12 to fit the spacer member 11 The screw through hole 11a is penetrated and screwed into the screw hole 21b of the attachment portion 21a to be fixed.

  When two circuit boards 1 and 2 that do not have the direct connectors 23 and 24 are attached to the base 21, the lower circuit board 1 is previously placed on the attachment portion 21a of the base 21. Then, the upper circuit board 2 on which the bush 12 and the spacer member 11 are temporarily fixed may be placed and aligned.

  Thus, since the screw penetration spacer 10 is used, the upper circuit board 2 can be temporarily fixed by the bush 12 and the spacer member 11 from above and below, so that the upper circuit board 2 and the lower circuit board 1 can be positioned. If they are combined, the screw insertion hole communicates from the bush 12 to the mounting portion 21a of the base 21, and can be easily screwed. Therefore, the spacer can be attached and screwed by a series of operations, so that the workability is very good.

  Further, since the opening 1b is continuously formed in the mounting hole 1a of the lower circuit board 1, the mounting part 21a can be seen even when the circuit board 1 is placed on the base 21, so that the alignment is possible. Easy to work with. Moreover, if the corresponding direct attachment connectors 23 and 24 are provided on the two circuit boards 1 and 2, the two circuit boards 1 and 2 can be screwed to the base 21 in a connected state. Can be installed efficiently.

  Note that the opening 1b is not limited to the notched end of the circuit board 1, and may be any one that is continuously provided on the end side so that the mounting portion 21a located below the mounting hole 1a can be seen. Good. For example, one long hole may be formed by the opening 1b and the attachment hole 1a.

  Further, since the mounting position of the spacer member 11 and the screwing position are the same, it is not necessary to provide two types of mounting holes for spacer and screwing in the lower circuit board 1, and the electronic component on the board is not required to be provided. A lot of mounting space can be secured. In addition, since the screw 15 is penetrated in a state where the two circuit boards 1 and 2 are stacked, the upper circuit board having a smaller area than the lower board is used to secure a screwing space as in the prior art. There is no need to use them, and the same size can be stacked in accordance with the size of the lower circuit board 1, so that a lot of mounting space can be secured.

  Next, the details of the connection structure between the bush 12 and the spacer member 11 will be described.

  4 is an external perspective view of the bush 12 with the head down, FIG. 5A is a partial longitudinal sectional view of the bush 12 and the spacer member (first spacer member) 11, and FIG. 4B is another spacer member ( It is a partial longitudinal cross-sectional view of the (second spacer member) 13. FIG. 5A shows the space member 11 shown in FIG. 1, but in order to distinguish it from the second spacer member 13 shown in FIG. Is described as a first spacer member.

  The bush 12 includes a head portion 12b and a leg portion 12c, which communicate with each other through a screw through hole 12a.

  The head 12b has an outer diameter and an inner diameter larger than the leg 12c, the inner step 12e of the head 12b accommodates and fixes the head of the screw 15, and the outer step 12f is attached to the upper circuit board 2. The screw through hole 12a in contact with the peripheral edge of the hole 2a and on the leg 12c side is formed so that the body portion of the screw 15 is penetrated. Further, the leg portion 12c is cut into a petal shape, and a locking projection 12d is formed on the outer surface of each petal so as to follow the circumference.

  On the other hand, the 1st spacer member 11 consists of the head 11b and the trunk | drum 11c, and these are connected by the screw through-hole 11a.

  The head portion 11b has an inner diameter larger than that of the body portion 11c, and a step portion 11d is formed at a boundary portion between the head portion 11b and the body portion 11c in the screw through hole 11a.

  The leg 12c of the bush 12 is elastically deformed and dents when inserted into the screw through hole 11a of the first spacer member 11, and expands when the locking projection 12d enters beyond the step 11d of the screw through hole 11a. The locking protrusion 12d is locked by the step portion 11d, and the bush 12 and the spacer member 11 are connected.

  That is, the screw hole 11a of the first spacer member 11 is aligned with the mounting hole 2a of the upper circuit board 2 from below, and the bush 12 The leg 12c is inserted into the mounting hole 2a and inserted into the screw through hole 11a of the first spacer member 11 on the opposite side, and the locking projection 12d formed on the leg 12c of the bush 12 is the first. Is engaged with the stepped portion 11d of the screw through hole 11a of the spacer member 11, the circuit board 2 is temporarily sandwiched between the outer stepped portion 12f of the bush 12 and the upper end 11e of the first spacer member 11. It is fixed (see FIG. 3).

  If the outer surface of the locking projection 12d of the bush 12 is rounded as shown in the drawing, the bush 12 can be easily inserted and removed with a small force. The circuit board 2 may be sandwiched so long as the mounting holes can be aligned with the bush 12 and the spacer member 11 attached to the circuit board 2. There is no problem in work.

  Alternatively, the first spacer member 11 may be engaged with each other only by the elastic restoring force of the leg portion 12c of the bush 12 without providing the step portion 11d. The same applies to the second spacer member 13 shown below.

  Like the first spacer member 11, the second spacer member 13 shown in FIG. 5B includes a head portion 13b and a body portion 13c, which communicate with each other through a screw through hole 13a. 13b has an inner diameter larger than that of the barrel portion 13c, a step portion 13d is formed at the boundary between the head portion 13b and the barrel portion 13c of the screw through hole 13a, and a locking projection 13f similar to the bush 11 is formed. It has the formed leg 13e.

  That is, the second spacer member 13 has the same insertion function as the bush 11 and can be connected to the first and second spacer members 11 and 13 by the leg portion 13e.

  Therefore, if a multistage screw penetration spacer composed of the screw 15, one first spacer member 11, at least one second spacer member 13 and one bush 12 is used, three or more pieces are used. These circuit boards can be stacked in multiple stages and fixed to the base 21.

  FIG. 6 is a perspective view showing a circuit board mounting structure using such a multi-stage screw penetration spacer. Here, a three-stage circuit board is illustrated.

  In the figure, 21 is a base such as a chassis, 21a is a mounting portion formed on the base 21 and having a screw hole 21b for mounting and fixing a circuit board, 1 is a lower circuit board, and 3 is a middle stage. Circuit board 2, 2 is an upper circuit board, 1a, 3a, 2a are mounting holes for circuit boards 1, 3, 2, 1b is an opening, 11 is a first spacer member having a screw through hole 11a, 13 is A second spacer member having a screw through hole 13a and a leg portion 13e, 12 is a bush having a screw through hole 12a and a leg portion 12c, 15 is a screw for fixing to the base 21, and 10A is a first spacer. This is a three-stage screw penetration spacer composed of the member 11, the second spacer member, the bush 12 and the screw 15.

  Next, a procedure for attaching and fixing the three circuit boards 1, 3, and 2 to the base 21 will be described.

  First, the mounting hole 2 a of the upper circuit board 2 is sandwiched between the bush 12 and the second spacer member 13 from above and below, and the leg portion 12 c of the bush 12 is inserted into the screw through hole 13 a of the second spacer member 13. The second spacer member 13 is temporarily fixed so as to be fitted and locked, and the second spacer member 13 is sandwiched by the second spacer member 13 and the first spacer member 11 from above and below the mounting hole 2a of the middle circuit board 3. The leg 13e is temporarily fixed so as to be fitted and locked into the screw through hole 11a of the first spacer member 11. The connection structure between the bush 12 and the second spacer member 13 and the connection structure between the second spacer member 13 and the first spacer member are as shown in FIG.

  The upper and middle circuit boards 2 and 3 and the lower circuit board 1 to which the bush 12, the second and first spacer members 11 and 13 are temporarily fixed are attached to the circuit boards 1, 3 and 2 correspondingly. The holes 1a, 3a, and 2a are aligned with the screw holes 21b of the mounting portion 21a of the base 21, and the screws 15 are inserted from above the bushes 12 so that the second and first spacer members are inserted. The screw through holes 13a and 11a of 13 and 11 are passed through and screwed into the screw holes 21b of the mounting portion 21a to be fixed.

  As described above, since the three-stage screw penetration spacer 10 is used, the bush 12 and the first and second spacer members 11 and 13 can be temporarily fixed to the upper and middle circuit boards 2 and 3. When aligned with the lower circuit board 1, the screw insertion hole communicates from the bush 12 to the mounting portion 21a of the base 21, and can be easily screwed. As described above, since the spacer can be attached and screwed by a series of operations, workability is very good.

That is, when mounting three or more circuit boards, the circuit board mounting structure is as follows:
A circuit board mounting structure in which three or more circuit boards having mounting holes corresponding to each other are fixed to a base in a state of being arranged in parallel with a predetermined interval using a screw penetration spacer,
The screw penetration spacer has a screw, one first spacer member in which a screw through hole is formed, a leg portion, a second spacer member in which a screw through hole is formed, and a leg portion. A structure in which a bush formed with a hole is combined, and a leg portion of the bush is inserted into and engaged with a screw through hole of the second spacer member, and a leg portion of the second spacer member is inserted into and locked to the second or first spacer member. Has been
On the upper circuit board, the bush and the second spacer member are fixed in a state where the mounting hole is sandwiched from above and below, and the leg portion of the bush is inserted and locked into the screw through hole of the second spacer member. And
Each circuit board sandwiched between the upper and lower circuit boards has a bush or a second spacer member and a second or first spacer member directly below the mounting hole, and the bush or second Are fixed in a state where the leg portions of the spacer members are inserted into and locked in the screw through holes of the second or first spacer members,
These circuit boards and the lower circuit board are made by matching the mounting holes formed in the respective circuit boards with the screw mounting holes of the mounting portions provided on the base, and further being fixed to the upper circuit board. By inserting the screw from above and screwing it into the screw mounting hole of the mounting portion, it is fixed in a state of being arranged in parallel at a predetermined interval.

  FIG. 7 is an exploded perspective view showing another example of the board mounting structure of the present invention.

  In the present embodiment, the screw penetrating spacer 10 </ b> B includes a spacer member 31, a bush 12, and a screw 15. As shown in the drawing, the upper and lower ends 31c, 31c of the spacer member 31 have a pincushion shape that is larger than the body center portion 31b. The other constituent members excluding the pincushion-shaped spacer member 31 are the same as those shown in FIG.

  This thread-wound spacer member 31 is the same as that of the first embodiment in that it has a screw through hole 31a, but a conductive portion 31d that makes contact with two adjacent circuit boards 1 and 2 is formed larger. Has been. For this reason, the energization contact with the ground conductive portion 1c of the circuit boards 1 and 2 can be sufficiently performed. Moreover, since the upper and lower ends are large, the support of the circuit board is also stable.

  As shown in FIG. 8, the thread-wound spacer member 31 can be easily formed by inserting and pressing press dies M, M above and below the metal pipe P. Of course, it is not limited to this manufacturing method.

  That is, the screw penetration spacer used in the present embodiment is a combination of a screw, a spacer member having a screw through hole, and a bush having a leg portion and having a screw through hole. After fixing the lower end of the mounting hole formed in one circuit board larger than the center part of the fuselage with a spacer member and a bush inserted and locked into the screw through hole of the spacer member, Align the mounting hole of one circuit board, the mounting hole of the other circuit board, and the screw mounting hole of the mounting part of the base, and insert the screw from above the bush to penetrate the spacer member and install The two circuit boards are fixed to the base in a state where they are arranged in parallel at a predetermined interval by being screwed into the screw mounting holes.

It is the perspective view which showed the attachment structure of the screw penetration spacer of this invention, and a circuit board. It is a disassembled perspective view of the screw penetration spacer of this invention, and the attachment structure of a circuit board. It is the fragmentary longitudinal cross-section which showed the attachment structure of the screw penetration spacer of this invention, and a circuit board. It is the whole bush perspective view (figure which shows the state where the head was turned down). It is the perspective view which showed the attachment structure of the screw penetration spacer which shows the other example of this invention, and a circuit board. (A) is a longitudinal cross-sectional view of a bush and a spacer member, (b) is a longitudinal cross-sectional view of a 2nd spacer member. These are the exploded perspective views which show the other example (Example 2) of this invention. It is a figure which shows the manufacturing process of the spacer member used in Example 2. FIG. It is a figure which shows the attachment structure of the conventional spacer and a circuit board.

Explanation of symbols

10, 10A, 10B Screw through spacer 11 (first) spacer member 11a Screw through hole 12 Bush 12a Through hole 12c Leg 13 Second spacer member 13a Screw through hole 13e Leg 15 Screw 31 Bobbin-shaped spacer member 31a Screw through hole 31b Body center part 31c Upper and lower ends 1 The other circuit board (lower stage)
1a Mounting hole 1b Opening 2 One circuit board (upper)
2a Mounting hole 3 Circuit board (middle)
3a Mounting hole 21 Base 21a Mounting portion 21b Screw mounting hole (screw hole)
23, 24 Direct connector

Claims (5)

A circuit board mounting structure in which two circuit boards formed with mounting holes corresponding to each other using screw penetration spacers are fixed to a base in a state of being arranged in parallel at a predetermined interval,
The screw through spacer is a combination of a screw, a spacer member having a screw through hole, and a bush having a leg portion and a screw through hole, and the leg portion is inserted into the screw through hole of the spacer member. It has a structure that stops,
On one circuit board, the bush and the spacer member are fixed in a state where the mounting hole is sandwiched from above and below, and the leg portion of the bush is inserted and locked into the screw through hole of the spacer member. And
The one circuit board and the other circuit board are aligned with the mounting holes formed in both circuit boards and the screw mounting holes of the mounting portions provided in the base, and further fixed to the one circuit board. The circuit is characterized in that the screw is inserted from above the bushing and is screwed into the screw mounting hole of the mounting portion to be fixed in parallel with a predetermined interval. Board mounting structure. In claim 1,
The circuit board mounting structure, wherein the spacer member is provided with a conductive portion that contacts a ground conductive portion formed on each of the two circuit boards arranged in parallel at a predetermined interval. . In claim 1 or 2,
An attachment structure for a circuit board, wherein the upper and lower ends of the spacer member are formed larger than the center part of the body. In any one of Claims 1-3,
A circuit board mounting structure, wherein each of the two circuit boards arranged in parallel at a predetermined interval is provided with a corresponding direct connector. In any one of Claims 1-4,
An attachment structure for a circuit board, wherein the attachment hole of the other circuit board is continuously provided with an opening that opens toward an end of the circuit board.

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