JPH0837391A - Ground potential connecting mechanism between electronic equipment units - Google Patents

Abstract

PURPOSE:To improve the noise resisting ability of electronic equipment units by stabilizing ground potentials between the units and, at the same time, to reduce the size of electronic equipment. CONSTITUTION:A connecting mechanism which connects ground potentials between electronic equipment units electrically connects ground potentials between each electronic equipment unit by connecting each electrode fitting 10 and 11 while the electronic equipment units are connected to each other. In addition, bent sections (c) and flat sections (b) are respectively provided to the fittings 10 and 11 so that the bent section 10c (first engaging section) of the fitting 10 can be elastically engaged with the flat section 11b (second engaging section) of the fitting 11 when both electronic equipment units are connected to each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for connecting a ground potential between a plurality of electronic equipment units.

[0002]

2. Description of the Related Art In an electronic device including a plurality of electronic device units, for example, an electronic device such as a programmable controller, it is necessary to stabilize the ground potential of each unit in order to improve noise resistance performance.

Therefore, conventionally, as shown in FIG. 5, a base unit 51 having an electrode fitting 50 is prepared, and each unit 52 of the programmable controller is attached to each connector 52 provided on the base unit 51 to form an electrode. By electrically connecting the metal fitting 50 and the ground potential of each unit 53, the impedance of the ground of each unit 53 is lowered to stabilize the ground potential, and the noise resistance performance is improved.

In the above-mentioned conventional method, a stable ground potential can be obtained by the electrode fitting 50, but the number of electronic device units that can be mounted on the base unit is limited. For example, when four electronic device units are used. Even if all is good, it is not suitable for downsizing electronic devices, such as having to use five base units.

On the other hand, there has been proposed a programmable controller configured by connecting a plurality of electronic device units without using a base unit. Each electronic device unit of this programmable controller is electrically connected by a connector. The ground potential is electrically connected between the units by allocating one or more pins of the connector for ground potential connection.

However, since the ground potential of the programmable controller in this method is only electrically connected by one or a plurality of the above connectors,
There is a problem that the impedance of the ground cannot be lowered and the noise resistance performance cannot be improved.

The present invention has been made in view of the above conventional problems, and it is possible to obtain a stable ground potential and improve the noise resistance performance, and further, it is possible to downsize the electronic device. The purpose is to provide.

[0008]

According to a first aspect of the present invention, there is provided a ground potential connecting mechanism between electronic device units of an electronic device which is configured by connecting a plurality of electronic device units,
Each of the electronic device units has an electrode fitting electrically connected to an internal substrate, and in a state where the electronic device units are connected to each other, each ground potential of the adjacent electronic device unit is electrically connected by the electrode fitting. The feature is that they are connected to each other.

According to a second aspect of the present invention, in the first aspect, the electrode fitting has a first engaging portion and a second engaging portion, and the electronic device units are connected to each other. ,
It is characterized in that the first engaging portion elastically engages with the second engaging portion of an adjacent electronic device unit.

[0010]

In the ground potential connection mechanism between electronic equipment units according to the first aspect of the present invention, the electrode fittings of the adjacent electronic equipment units are electrically connected in a state where the electronic equipment units are connected to each other. Thus, the ground potential is connected between the electronic device units. At this time, since the ground of each electronic device unit is not connected by the pin assigned to the connector but by the electrode fittings provided in each electronic device unit, the ground potential of the electronic device can be prevented without hindering downsizing of the electronic device. The impedance can be lowered, and as a result, the ground potential is stabilized, so that the noise resistance performance can be improved.

According to the second aspect of the present invention, when the electrode fittings are connected to each other, the first engaging portion of the electronic equipment unit is connected to the second engaging portion of the electronic equipment unit adjacent to the electronic equipment unit. Engage elastically. As a result, even if the electronic device is installed in an environment with a lot of vibration, the connection state of the electrode fittings can be strengthened and the noise resistance performance can be improved.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. As shown in FIGS. 1 and 2, each electronic device unit 1, 2 of the programmable controller has a case 3, 4 respectively. The cases 3 and 4 are provided with connecting members 5 and 6 for connecting each other.

The connecting member 5 has a claw portion 7, and the claw portion 7 engages with an engaging hole 8 formed in the case 4, whereby the units 1 and 2 are mechanically coupled to each other. It is supposed to be done. The same applies when other units are connected using the connecting member 6. Further, when the units are connected, the respective units 1 and 2 are electrically connected by the connector 9.

Electrode metal fittings 10 and 11 electrically connected to a substrate (not shown) in each case are attached to the cases 3 and 4. The electrode fittings 10 and 11 are formed by forming a metal plate such as phosphor bronze into a shape as shown in FIG. 3, and mainly include a bottom wall portion a, a flat portion b and a bent portion c for ground connection. It consists of and. Electrode metal fitting 10
And 11 differ only in the length L of the bottom wall portion a, and the length L depends on the width in the unit connecting direction.

Next, when connecting the units 1 and 2, when the units 1 and 2 are arranged to face each other as shown in FIG. 2, the bent portion 10c of the unit 1 side electrode fitting 10 and the unit 2 side electrode fitting 11 are arranged. And the flat portion 11b are arranged in a positional relationship as shown in FIG. 4 (a) (partial sectional view of FIG. 2). From this state, when the units 1 and 2 are connected by the connecting member 5 (state of FIG. 1), the bent portion 10c is deformed by the flat portion 11b as shown in FIG. 4 (b) (partial sectional view of FIG. 1). As a result, both are elastically engaged.

In this case, the ground potential is the electrode fitting 1.
Since the connections are 0 and 11, the impedance of the ground potential is low and the noise resistance performance is high. Moreover, since the connection between the electrode fittings is not a simple contact but a strong engagement due to the elastic deformation of the bent portion 10c, the connection between the electrode fittings does not come off even in an environment with a lot of vibration, and the noise resistance performance can be improved. .

Further, since it is not necessary to separately provide the base unit, the programmable controller can be downsized.

Further, when connecting the units, even if the connection of the electrode fittings 10 and 11 is not taken into consideration,
Since the electrode fittings 10 and 11 are engaged with each other at the same time when the two are connected to each other, it is easy to connect the units of the programmable controller.

In the above embodiment, the electrode fittings 10, 1
Although the bent portion is formed only at each one end portion of No. 1, it may be formed at each end portion. Further, the shape of the bent portion is not limited to that shown in FIGS. Further, the material of the electrode fitting is not limited to phosphor bronze, but may be another metal.

Further, although the programmable controller is taken as an example in the above-mentioned embodiment, the present invention can be similarly applied to other electronic devices.

[0021]

As described above, according to the ground potential connecting mechanism between the electronic equipment units according to the present invention, the electronic equipment units are provided with the electrode fittings, and the electronic equipment units are adjacent to each other in a connected state. Since the ground potentials of the electronic device unit are electrically connected by the electrode fittings, there is an effect that the ground potential can be stabilized, the noise resistance performance can be improved, and the electronic device can be downsized.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a programmable controller to which a ground potential connection mechanism according to an embodiment of the present invention is applied after unit connection.

FIG. 2 is an overall perspective view of the programmable controller before unit connection.

FIG. 3 is an overall perspective view of an electrode fitting attached to each electronic device unit of the programmable controller.

4A and 4B are views for explaining the engagement state of the electrode fittings before and after the unit is connected, where FIG. 4A is a partial sectional view of FIG. 2 and FIG. 4B is a partial sectional view of FIG.

FIG. 5 is a view corresponding to FIG. 1 showing a conventional ground potential connection mechanism.

[Explanation of symbols]

 Reference Signs List 1 and 2 electronic device unit 3 and 4 case 5 and 6 connecting member 10 and 11 electrode fitting 10c bent portion (first engaging portion) 11b flat portion (second engaging portion)

Claims (2)

[Claims] 1. A ground potential connection mechanism between electronic device units of an electronic device configured by connecting a plurality of electronic device units, wherein each electronic device unit includes an electrode fitting electrically connected to an internal substrate. A ground potential connection mechanism between electronic device units, wherein each of the ground potentials of the adjacent electronic device units is electrically connected by the electrode fitting in a state where the electronic device units are connected to each other. . 2. The electrode fitting includes a first engaging portion and a second engaging portion.
And the first engagement portion elastically engages with the second engagement portion of the adjacent electronic equipment unit in a state where the electronic equipment units are connected to each other. The ground potential connection mechanism between the electronic device units according to claim 1, characterized in that.