WO2014128812A1

WO2014128812A1 - Connection structure for printed circuit boards, electronic device, and servomotor

Info

Publication number: WO2014128812A1
Application number: PCT/JP2013/007483
Authority: WO
Inventors: 芳幸渡部; 睦小山; 創杉浦
Original assignee: 日本精工株式会社
Priority date: 2013-02-22
Filing date: 2013-12-19
Publication date: 2014-08-28
Also published as: JP5831561B2; JPWO2014128812A1; CN104303607A; CN104303607B

Abstract

In this connection structure for printed circuit boards, a first and second printed circuit board (1, 3), which are disposed perpendicularly to one another and are electrically connected together, are secured within a casing (50). The electrical wiring of the first printed circuit board (1) and the electrical wiring of the second printed circuit board (3) are connected by connectors (21, 23). Both printed circuit boards (1, 3) are secured by means of an L-shaped fitting (9) near the connector connecting section (2) of both printed circuit boards (1, 3).

Description

Printed circuit board connection structure, electronic device, servo motor

The present invention relates to a printed circuit board connection structure (a structure in which a plurality of printed circuit boards arranged vertically and electrically connected to each other are fixed in a casing), and an electronic device having the connection structure (a plurality of printed circuit boards) The printed circuit boards are arranged in a vertical manner and are electrically connected to each other and are fixed in a casing), and a servo motor including the electronic device.

With the recent increase in the density of electronic devices, in electronic devices used as servo motor control devices, etc., not only a plurality of printed circuit boards are arranged parallel to each other, but they are often arranged perpendicular to each other. Yes.
For example, in a servo motor control device, a main printed circuit board, which is a power amplifier board and a control board, are arranged perpendicular to the front panel constituting the housing. However, the sub printed circuit board may need to be arranged in parallel with the front panel in order to arrange many functional parts such as LED displays, connectors, and monitor terminals on the front panel. In that case, it is necessary to electrically connect the main printed circuit board and the sub printed circuit board with a connector in a mutually perpendicular arrangement.

Also, when fixing printed circuit boards arranged vertically to each other in the housing, both printed circuit boards are fixed to the front panel and the bottom plate of the housing with the connectors of both printed circuit boards being electrically connected to each other. It is common to fix the front panel and the bottom plate later.
In the conventional example shown in FIG. 4, the first printed circuit board 1 and the second printed circuit board 3 are arranged perpendicular to each other in the housing 50 of the electronic device 130. The second printed circuit board 3 is arranged in parallel with the front panel 7, and the first printed circuit board 1 is arranged perpendicular to the front panel 7.

The second printed circuit board 3 is fixed to the front panel 7 constituting the housing 50 via

spacers

6 and 8. A third printed circuit board 15 is fixed to the bottom plate 5 of the casing 50. The first printed circuit board 1 is fixed to the third printed circuit board 15 with spacers 4. That is, the first printed circuit board 1 is fixed to the bottom plate 5 of the housing 50 via the third printed circuit board 15.

The first printed circuit board 1 and the second printed circuit board 3 are electrically connected by

connectors

21 and 23 mounted on each. The first printed circuit board 1 and the third printed circuit board 15 are electrically connected by a cable 18 that couples the

cable connectors

16 and 17 mounted on each.
In the conventional example of FIG. 4, when assembling the electronic device 130, first, the printed

circuit boards

1 and 3 that are arranged vertically and are electrically connected by the

connectors

21 and 23 are connected to the front panel 7 of the housing 50 and It fixes to the baseplate 5, respectively. Next, the front panel 7 is fixed to the bottom plate 5 with the machine screws 12.

In this conventional example, as shown in FIG. 5, the mounting position of the front panel 7 can be adjusted by providing a clearance in the bolt insertion hole 71 of the front panel 7. Thereby, an attempt is made to remove as much stress as possible on the connector connecting portion 2 of the printed

circuit boards

1 and 3 as much as possible.
On the other hand, Patent Document 1 describes a printed circuit board fixing bracket that can fix a printed circuit board standing vertically from a main circuit board for mounting an optional circuit board on a personal computer or the like without applying stress.

Japanese Patent Laid-Open No. 10-150281

If printed circuit boards arranged perpendicular to each other are connected only by connectors mounted on the respective boards, it is difficult to fix both printed circuit boards in the casing of the electronic device in a precisely vertical arrangement. Therefore, it is inevitable that a stress is applied to the connector connecting portion.
If a state where stress is applied to the connector connection portion continues, contact failure or conduction failure may occur, and the electronic device may not function normally. Therefore, it is required to prevent stress from being applied to the connector connecting portion in a state where the printed circuit boards that are arranged vertically and connected by the connector are fixed in the casing of the electronic device.
In the connection structure shown in FIG. 4 described above, as shown in FIG. 5, the connector connecting portion 2 of the printed

circuit boards

1 and 3 arranged perpendicular to each other can be adjusted by making it possible to adjust the attachment position of the front panel 7 to the bottom plate 5. It is also possible to assemble without stress. However, even in this case, if there is a problem in assembly accuracy, there is a risk that stress remains in the connector connection portion 2.

In the connection structure shown in FIG. 4, even when assembled correctly, stress is applied to the connector connecting portions 2 of the printed

circuit boards

1 and 3 when the entire electronic device is shaken due to external vibration or the like. Therefore, in the connection structure shown in FIG. 4, it is difficult to prevent stress from being applied to the connector connecting portion 2 at all times in use.
The fixing bracket described in Patent Document 1 has a complicated shape, and it is not sufficient to fix the fixing bracket at only one place with the fixing bracket, and many fixing brackets are often required. Even in the case of this fixing bracket, if there is a problem in assembly accuracy, there is a risk that stress may remain in the connection portions of the printed circuit boards arranged perpendicular to each other. Furthermore, if the number of parts is increased by using a large number of fixing brackets, it is difficult to mount all of them with high accuracy, so that there remains a problem in terms of assembly accuracy.
An object of the present invention is to prevent stress from being applied to the connector connecting portions of both printed circuit boards in a state where the printed circuit board connection structure is arranged perpendicularly to each other while the number of parts is reduced while being fixed in the housing. It is.

In order to solve the above problems, the printed circuit board connection structure according to the first aspect of the present invention is characterized by having the following configurations (1) to (3).
(1) First and second printed circuit boards arranged vertically and electrically connected to each other are fixed in a housing.
(2) The electrical wiring of the first printed circuit board and the electrical wiring of the second printed circuit board are connected by a connector.
(3) The printed circuit boards are fixed by L-shaped metal fittings in the vicinity of the connector connecting portion.
According to the connection structure of this aspect, since the printed circuit boards arranged perpendicular to each other are fixed by the L-shaped bracket in the vicinity of the connector connection portion, in the vicinity of the connector connection portion in a state of being fixed in the housing. Thus, the vertical arrangement of both printed circuit boards is maintained. Therefore, it is possible to prevent stress from being applied to the connector connecting portions of both printed circuit boards while being fixed in the housing.

In addition, since the L-shaped bracket, which has a simpler shape than the fixing bracket described in Patent Document 1, is used, both printed circuit boards can be fixed with high accuracy, and sufficient fixing can be performed even at a single location. it can. Therefore, it is possible to prevent stress from being applied to the connector connecting portion while being fixed in the housing with a smaller number of parts than in the case where the fixing metal fitting described in Patent Document 1 is used.

The first and second printed circuit boards arranged vertically and electrically connected to each other can be fixed in the housing by the following method, for example.
First, both printed circuit boards are fixed with L-shaped metal fittings. Next, one printed circuit board is arranged in parallel with the wall board in the housing having the wall board and the bottom board, the other printed circuit board is arranged perpendicular to the wall board, and the one printed circuit board is placed on the wall board. The other printed circuit board is fixed to a portion other than the wall plate of the casing.

The connection structure of the first aspect can further have the following configurations (a) to (c), and can further have the following configurations (a), (b), and (d).
(a) The housing includes a wall plate and a bottom plate, the first printed circuit board is disposed perpendicular to the wall plate, and the second printed circuit board is disposed in parallel with the wall plate.
(b) The first printed circuit board is fixed to the bottom plate via a first spacer that holds a predetermined distance with respect to the bottom plate. The second printed circuit board is fixed to the wall plate via a second spacer that maintains a predetermined interval with respect to the wall plate.
(c) The length of the first spacer is different from the length of the second spacer.
(d) The length of the first spacer is one half or more of the height of the housing.

An electronic device according to a second aspect of the present invention is characterized by having the following configurations (4) to (7) or the following configurations (4) to (8).
(4) A casing having a front panel and a bottom plate, a first printed circuit board disposed in the casing perpendicular to the front panel, and a second print disposed in the casing in parallel with the front panel. And a substrate.
(5) The second printed circuit board is fixed to the front panel, and the first printed circuit board is fixed to a portion of the housing other than the front panel.
(6) The electrical wiring of the first printed circuit board and the electrical wiring of the second printed circuit board are connected by connectors adjacent to each other.
(7) The first printed circuit board and the second printed circuit board are fixed by an L-shaped bracket in the vicinity of the connector connecting portion.
(8) The front panel and the bottom plate are perpendicular to each other, the first printed circuit board is fixed to the bottom plate, the front panel and the bottom surface are made of different members, and both are inserted through the front panel. It is fixed with screws.

The electronic device according to the second aspect may have the configurations (4) to (8) and the following configurations (e) and (f), and the configurations (4) to (8) and the following configurations (e) (g) Can also be included.
(e) The first printed circuit board is fixed via a first spacer that holds a predetermined distance with respect to the bottom plate, and the second printed circuit board holds a predetermined distance with respect to the front panel. It is fixed via a second spacer.
(f) The length of the first spacer is different from the length of the second spacer.
(g) The length of the first spacer is one half or more of the height of the housing.
The connection structure of the first aspect and the electronic device of the second aspect can have the following configuration (h).
(h) The length of the second spacer is less than one half of the height of the housing.
A servo motor according to a third aspect of the present invention includes the electronic device according to the second aspect as a control device.

According to the present invention, it is possible to prevent stress from being applied to the connector connecting portions of the printed circuit boards arranged perpendicular to each other while being fixed in the casing, while reducing the number of components.

It is a figure which shows the connection structure of the printed circuit board corresponded to embodiment of this invention, Comprising: It is a sectional side view of an electronic device. FIG. 2 is a cross-sectional view taken along the line AA in FIG. It is a schematic block diagram which shows the servomotor equivalent to embodiment of this invention. It is a figure which shows the prior art example of the connection structure of a printed circuit board, Comprising: It is a sectional side view of an electronic device. It is a partial expanded sectional view of FIG.

Embodiments of the present invention will be described below, but the present invention is not limited to these embodiments.
The electronic device 13 of this embodiment includes a housing 50, a first printed circuit board 1, a second printed circuit board 2, and a third printed circuit board 15. These printed

circuit boards

1, 2, 15 are arranged in the housing 50. The housing 50 has a front panel 7 and a bottom plate 5 made of different members. The front panel 7 and the bottom plate 5 are perpendicular to each other. The front panel 7 and the bottom plate 5 are fixed with machine screws 12 inserted from the front panel 7.

The second printed circuit board 3 is disposed in parallel with the front panel 7 and fixed to the front panel 7 using spacers (second spacers) 6 and 8.
The first printed circuit board 1 and the third printed circuit board 15 are arranged perpendicular to the front panel 7. The third printed circuit board 15 is fixed to the bottom plate 5 of the housing 50. The first printed circuit board 1 is fixed to the third printed circuit board 15 with a spacer (first spacer) 4. That is, the first printed circuit board 1 is fixed to the bottom plate 5 of the housing 50 via the third printed circuit board 15. Further, the length of the spacer 4 is at least half of the height of the housing 50.

The electrical wiring of the first printed circuit board 1 and the electrical wiring of the second printed circuit board 3 are connected by

connectors

21 and 23 adjacent to each other. The first printed circuit board 1 and the second printed circuit board 3 are fixed by an L-shaped metal fitting 9 in the vicinity of the connector connecting portion 2 by the

connectors

21 and 23. The L-shaped bracket 9 is composed of two

pieces

91 and 92 that are perpendicular to each other. One piece 91 is fixed to the first printed circuit board 1 with a machine screw 11 and the other piece 92 is secured to the second printed board 3 with a machine screw 10. It is fixed to.

The first printed circuit board 1 and the third printed circuit board 15 are electrically connected by a cable 18 that couples the

cable connectors

16 and 17.
The electronic device 13 can be assembled by the following method.
First, one piece 91 of the L-shaped metal fitting 9 is fixed to the first printed circuit board 1 with the small screw 11, and the other piece 92 is fixed to the second printed circuit board 3 with the small screw 10. At that time, electrical connection by the

connectors

21 and 23 is simultaneously performed. Thus, thereafter, the first printed circuit board 1 and the second printed circuit board 3 can be handled as an integral L-shaped substrate.

Next, the first printed circuit board 1 of the L-shaped substrate is fixed to the third printed circuit board 15 fixed to the bottom plate 5 by using the spacer 4, and the second printed circuit board 3 is fixed to the

spacer

6, 8 is fixed to the front panel 7. Next, the front panel 7 and the bottom plate 5 are integrated by inserting the machine screw 12 through the screw insertion hole of the front panel 7 and screwing into the female screw of the bottom plate 5.
Next, after attaching other electronic components or the like in the housing 50, the housing 50 is closed by covering the L-shaped lid 51 and fixing it to the bottom plate 5 and the front panel 7.
According to the electronic device of this embodiment, the first printed circuit board 1 and the second printed circuit board 3 are coupled to each other by the L-shaped bracket 9 so that the first printed circuit board 1 is fixed to the housing 50. It is possible to prevent stress from being applied to the connector connecting portion 2 of the second printed circuit board 3.

Further, the L-shaped metal fitting 9 has a simple shape, and as in this embodiment, it can be sufficiently fixed even at a single location. For this reason, it is possible to prevent stress from being applied to the connector connecting portion 2 while being fixed in the housing 50 with a smaller number of parts than when the fixing metal fitting described in Patent Document 1 is used.
In the electronic device 13 of this embodiment, the lengths of the spacer (first spacer) 4 and the spacers (second spacers) 6 and 8 are different, and the length of the spacer 4 is half of the height of the housing 50. One or more. Therefore, the spacer 4 and the first printed circuit board 1 are likely to be shaken by external vibration, but the first printed circuit board 1 and the second printed circuit board 3 are fixed by the L-shaped metal fitting 9, It is possible to prevent stress from being applied to the connector connector 2 of 3.

On the other hand, if the first printed circuit board 1 and the second printed circuit board 3 are not fixed by the L-shaped bracket 9 as in the conventional electronic device 130 shown in FIG. The first printed circuit board 1 is easily shaken, and stress is easily applied to the connector connecting portions 2 of the printed

circuit boards

1 and 3.
Note that the method of assembling the electronic device 13 is not limited to the above-described method. For example, the mounting order of the first printed circuit board 1 and the second printed circuit board 3 by the L-shaped bracket 9 may be reversed. Moreover, as the

spacers

4, 6 and 8, commercially available hexagonal spacers can be used, but the spacers are not limited thereto. For example, the

spacers

4, 6, and 8 may be integrally formed with the bottom plate 5 and the front panel 7 of the housing 50.

Further, the front panel 7 and the bottom plate 5 can be joined by the machine screw 12 by the method shown in FIG.
As shown in FIG. 3, the servo motor corresponding to the embodiment of the present invention includes a control device (driver) including the electronic device 13 of this embodiment, a motor 14, and

wiring cables

19a and 19b. In this case, the first printed board 1 is a control board, the second printed board 3 is an interface board, and the third printed board 15 is a power amplifier board.

The printed circuit board connection structure of the present invention can be suitably applied to an electronic device such as a servo motor driver that needs to be arranged with high density. Moreover, although it is used in an environment where vibration occurs, it can be suitably applied to an electronic device that requires a plurality of printed circuit boards to be arranged perpendicular to each other in the housing in terms of its function. It is also particularly useful when the spacer for fixing the printed circuit board in the casing is long (for example, when the length of the spacer is one half or more of the height or depth of the casing).

DESCRIPTION OF SYMBOLS 1 1st printed circuit board 2

Connector connection part

21,23 Connector 3 2nd printed circuit board 4 Spacer (1st spacer)
5 Bottom plate (portion other than the front panel of the housing)
50 Housing 51 Lid 6 Spacer (second spacer)
7 Front panel (wall board)
71 Front panel bolt insertion hole 8 Spacer (second spacer)
9 L-shaped

bracket

91, 92 Two pieces of L-shaped bracket perpendicular to each other 12 Machine screw 13 Electronic device 14 Motor 130 Electronic device 15 Third printed

circuit board

16, 17 Cable connector 18

Cable

19a, 19b Wiring cable

Claims

A printed circuit board connection structure in which the first and second printed circuit boards arranged vertically and electrically connected to each other are fixed in a housing,
The electrical wiring of the first printed circuit board and the electrical wiring of the second printed circuit board are connected by a connector,
A printed circuit board connection structure, wherein both printed circuit boards are fixed by L-shaped metal fittings in the vicinity of the connector connecting portion.
The housing has a wall plate and a bottom plate,
The first printed circuit board is disposed perpendicular to the wall board, and the second printed circuit board is disposed in parallel with the wall board,
The first printed circuit board is fixed to the bottom plate via a first spacer that holds a predetermined interval with respect to the bottom plate,
The second printed circuit board is fixed to the wall plate via a second spacer that holds a predetermined interval with respect to the wall plate,
The printed circuit board connection structure according to claim 1, wherein a length of the first spacer is different from a length of the second spacer.
The housing has a wall plate and a bottom plate,
The first printed circuit board is disposed perpendicular to the wall board, and the second printed circuit board is disposed in parallel with the wall board,
The first printed circuit board is fixed to the bottom plate via a first spacer that holds a predetermined interval with respect to the bottom plate,
The second printed circuit board is fixed to the wall plate via a second spacer that holds a predetermined interval with respect to the wall plate,
The printed circuit board connection structure according to claim 1, wherein a length of the first spacer is one half or more of a height of the housing.
A housing having a front panel and a bottom plate;
A first printed circuit board disposed perpendicular to the front panel in the housing;
A second printed circuit board disposed in parallel with the front panel in the housing;
Have
The second printed circuit board is fixed to the front panel; the first printed circuit board is fixed to a portion of the housing other than the front panel;
The electrical wiring of the first printed circuit board and the electrical wiring of the second printed circuit board are connected by connectors adjacent to each other,
The electronic device, wherein the first printed circuit board and the second printed circuit board are fixed by an L-shaped bracket in the vicinity of the connector connecting portion.
The front panel and the bottom plate are perpendicular to each other;
The first printed circuit board is fixed to the bottom plate;
The electronic device according to claim 4, wherein the front panel and the bottom surface are made of different members, and both are fixed by screws inserted from the front panel.
The first printed circuit board is fixed via a first spacer that holds a predetermined interval with respect to the bottom plate,
The second printed circuit board is fixed via a second spacer that holds a predetermined interval with respect to the front panel,
The electronic device according to claim 5, wherein a length of the first spacer is different from a length of the second spacer.
The first printed circuit board is fixed via a first spacer that holds a predetermined interval with respect to the bottom plate,
The second printed circuit board is fixed via a second spacer that holds a predetermined interval with respect to the front panel,
The electronic device according to claim 5, wherein a length of the first spacer is one half or more of a height of the housing.
A servo motor having the electronic device according to any one of claims 4 to 7 as a control device.