JP3677633B2 - Ground potential connection mechanism between electronic device units - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a structure for connecting a ground potential between a plurality of electronic device units.
[0002]
[Prior art and problems]
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.
[0003]
Therefore, conventionally, as shown in FIG. 5, a base unit 51 having an electrode fitting 50 is prepared, and each unit 53 of the programmable controller is attached to each connector 52 provided on the base unit 51. By electrically connecting the ground potential of each unit 53, the impedance of the ground of each unit 53 is lowered to stabilize the ground potential, and noise resistance is improved.
[0004]
In the 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 may be used. However, it is not suitable for downsizing of electronic devices, such as having to use 5 base units.
[0005]
On the other hand, a programmable controller configured by connecting a plurality of electronic device units without using a base unit has been proposed. Each electronic device unit of this programmable controller is electrically connected by a connector. The ground potential is electrically connected between the units by assigning one or more pins of the connector for ground potential connection.
[0006]
However, since the ground potential of the programmable controller in this method is only electrically connected by one or more of the connectors, the impedance of the ground cannot be lowered and the noise resistance performance cannot be improved. There is a problem.
[0007]
The present invention has been made in view of the above-described conventional problems, and provides a ground potential connection mechanism between electronic device units that can obtain a stable ground potential, improve noise resistance, and can downsize an electronic device. For the purpose.
[0008]
[Means for Solving the Problems]
The invention of claim 1 is a ground potential connection mechanism between the electronic device units of an electronic device configured by connecting a plurality of electronic device units, wherein each of the electronic device units is provided on each internal substrate of the electronic device unit. A connector having an electrode fitting including a first engagement portion and a second engagement portion for electrically connecting a ground potential, and a pin for electrically connecting the electronic device units; In a state where the electronic device units are connected to each other , the first engagement portion of the electrode fitting elastically engages with the second engagement portion of the electrode fitting of the adjacent electronic device unit. The ground potentials of the adjacent electronic device units are electrically connected, and at the same time, the connectors between the units are electrically connected.
[0009]
A second aspect of the present invention, in claim 1, with the first engaging portion, the second engagement portion is characterized by having a bent portion. A third aspect of the present invention, according to claim 1, wherein the first engagement portion has a flat portion, the second engagement portion is characterized by having a bent portion.
[0010]
[Action]
In the ground potential connection mechanism between the electronic device units according to the invention of claim 1, each electrode device of the adjacent electronic device unit is electrically connected in a state where the electronic device units are connected to each other, A ground potential is connected between the electronic device units. At this time, the ground of each electronic device unit is not a connection by a pin assigned to the connector but a connection by an electrode fitting provided in each electronic device unit. The impedance can be lowered, and as a result, the ground potential is stabilized, so that the noise resistance can be improved. When the electrode fittings are connected to each other, the first engagement portion of the electronic device unit is elastically engaged with the second engagement portion of the electronic device unit adjacent to the electronic device unit. Thereby, even if the electronic device is installed in an environment with a lot of vibration, the connection state of the electrode fitting can be strengthened, and the noise resistance performance can be improved.
[0012]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
As shown in FIG.1 and FIG.2, each electronic device unit 1 and 2 of a programmable controller has the cases 3 and 4, respectively. The cases 3 and 4 are provided with connecting members 5 and 6 for connecting each other.
[0013]
The connecting member 5 has a claw portion 7, and the units 1 and 2 are mechanically connected to each other by engaging the claw portion 7 in an engagement hole 8 formed in the case 4. It has become. The same applies when other units are connected using the connecting member 6. When the units are connected, the units 1 and 2 are electrically connected by the connector 9.
[0014]
In the cases 3 and 4, electrode fittings 10 and 11 that are electrically connected to a substrate (not shown) in each case are attached. 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. The electrode fittings 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.
[0015]
Next, when the units 1 and 2 are connected to each other, the bent portions 10c of the unit 1-side electrode fitting 10 and the flat portions of the unit 2-side electrode fitting 11 are obtained by arranging the units 1 and 2 so as to face each other as shown in FIG. 11b are arranged in a positional relationship as shown in FIG. 4A (partial sectional view of FIG. 2). From this state, when the units 1 and 2 are connected by the connecting member 5 (the state shown in FIG. 1), the bent portion 10c is deformed by the flat portion 11b as shown in FIG. 4B (cross-sectional partial view of FIG. 1). And both are elastically engaged.
[0016]
In this case, since the ground potential is connected by the electrode fittings 10 and 11, the impedance of the ground potential is low and the noise resistance performance is high. In addition, since the connection between the electrode fittings is not a simple contact but a strong engagement by elastic deformation of the bent portion 10c, the coupling between the electrode fittings is not released even in an environment with a lot of vibration, and noise resistance performance can be improved. .
[0017]
Moreover, since it is not necessary to provide a base unit separately, a programmable controller can be reduced in size.
[0018]
Further, when connecting the units, the electrode fittings 10 and 11 are simultaneously engaged when the units 1 and 2 are connected to each other without being aware of the connection of the electrode fittings 10 and 11, so Connection between each unit is easy.
[0019]
In the above embodiment, the bent portion is formed only at one end of each of the electrode fittings 10 and 11, but this may be formed at each end. Further, the shape of the bent portion is not limited to that shown in FIGS. The material of the electrode fitting is not limited to phosphor bronze, and may be other metals.
[0020]
Although the programmable controller is taken as an example in the above embodiment, the present invention can be applied to other electronic devices as well.
[0021]
【The invention's effect】
As described above, according to the ground potential connection mechanism between the electronic device units according to the present invention, each electronic device unit is provided with the electrode fitting, and the electronic device units are connected to each other in the state where the electronic device units are connected to each other. Since the ground potential is electrically connected by the electrode fitting, the ground potential can be stabilized, noise resistance can be improved, and electronic devices can be downsized.
[Brief description of the 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 diagrams for explaining the engagement state of the electrode fitting before and after the unit is connected, in which 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]
DESCRIPTION OF SYMBOLS 1, 2 Electronic device unit 3, 4 Case 5, 6 Connecting member 10, 11 Electrode metal fitting 10c Bending part (1st engaging part)
11b Flat part (second engaging part)

Claims (3)

In the ground potential connection mechanism between the electronic device units of an electronic device configured by connecting a plurality of electronic device units,
Each electronic device unit includes an electrode fitting including a first engagement portion and a second engagement portion for electrically connecting each ground potential of the internal substrate of each electronic device unit, and each electronic device. Having a connector with pins for electrical connection between units;
When the electronic device units are connected to each other , the first engaging portion of the electrode fitting elastically engages with the second engaging portion of the electrode fitting of the adjacent electronic device unit. , ground potential connection mechanism between the electronics unit of the ground potential, characterized in that the connector between the unit and at the same time being electrically connected are electrically connected to the electronics unit adjacent. The ground potential connection mechanism between electronic device units according to claim 2 , wherein the electrode fitting has the first engaging portion and the second engaging portion having a bent portion. 3. The ground potential connection between electronic device units according to claim 2 , wherein in the electrode fitting, the first engaging portion has a flat portion, and the second engaging portion has a bent portion. mechanism.

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