JP3070802B2 - Electrical contacts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric contact such as a relay for interrupting a current circuit.

[0002]

2. Description of the Related Art Conventionally, a contact used in this type of relay is a PdRu alloy contact on the anode side and an Au contact on the cathode side as described in Japanese Patent Application Laid-Open No. 62-234810.
And a contact made by laminating an AgNi alloy or an AgPd alloy. This is to prevent the contacts from being unable to be separated.

[0003] However, the contact of this configuration is 0.1 to 2
When a DC load of about A is opened and closed, there is a restriction that the polarities of the anode side and the cathode side are specified, and the improvement has been demanded from the viewpoint of multifunctionalization, generalization, and the like.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems, and it is an object of the present invention to liberalize the polarity of an anode and a cathode of an electric contact used for a relay or the like.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention provides an electric contact having at least a three-layer structure in which Ag or an Ag alloy is laminated on an upper layer of a PdRu alloy, and an Au alloy is further laminated on a first layer of the surface. The anode and the cathode are opposed to each other.

[0006]

The above-mentioned at least three-layer structure and the use of the same type as the anode side and the cathode side can be used without being restricted by the polarity with respect to the DC load current, the contact resistance is low, and the stable electric power is good. It becomes a contact point.

[0007] The DC load normally used for a relay is 10 to 1
In many cases, the contact metal is transferred from the anode side to the cathode side by the arc energy. However, in the present invention, the transition is suppressed by the Au alloy and the Ag alloy, but the initial characteristics are stabilized, and then the transition is suppressed from the time when the PdRu alloy comes into contact. As a result, the height of the protrusion to the opposed contact due to the transition is reduced. It is determined by the thickness of the Au alloy and the Ag alloy, and if the height of the convex portion is 0.1 mm or less, the hole and the protrusion are not caught and cannot be separated.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment and a conventional example will be described below. First, as an example, the material of the first layer is AuAg 10% and the thickness is 10 μm.
m, AgPd 60%, thickness 60 μm as the second layer, PdRu 10%, thickness 350 μm as the third layer, CuNi 30% as the fourth layer Contact material consisting of a four-layer structure of 180 μm is made of beryllium copper, plate thickness 0.1 mm Was attached to the spring material by electric resistance welding. The anode and the cathode were made to be of the same type and opposed.

Next, in the conventional example, the material P is used as the first layer.
dRu10%, thickness 350μm, material CuNi as the second layer
A contact material having a two-layer structure of 30% and a thickness of 250 μm was obtained.
Further, a contact material having a three-layer structure of AuAg 10% and thickness 10 μm as the first layer, AgPd 50% and thickness 350 μm as the second layer, CuNi 30% and thickness 240 μm as the third layer was used. These are made of beryllium copper, 0.1mm thick
Was attached to the spring material by electric resistance welding.

However, voltage 48V, current 200mA, contact force 15
gf, dissociation force 10gf, switching frequency 60Hz, switching frequency 100,000 times,
When the test was conducted under the test conditions of 28 hours, the following results were maintained.

[0011]

[Table 1]

As is apparent from these results, the conventional example 1 was good, but in the conventional example 2 in which the polarity was changed, a hole was formed in the anode-side contact surface, and the cathode-side contact surface was transferred to generate a projection. As a result, it was impossible to disengage due to the hooking, but in the examples, the disengagement was not impossible, and the contact resistance was low, stable and good.

[0013]

As is apparent from the above results, according to the present invention, an excellent effect that a stable and good electrical contact can be obtained which can be used as the same type of opposition, has low contact resistance and is not restricted by polarity. It has.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01H 1/04 H01H 50/54

Claims (1)

(57) [Claims] 1. A contact having at least a three-layer structure in which Ag or an Ag alloy is laminated on an upper layer portion of a PdRu alloy, and an Au alloy is further laminated on a first surface portion of the PdRu alloy. Electrical contacts characterized by the following.