JP4872645B2 - surge absorber - Google Patents

Description

  The present invention relates to a surge absorber used for surge countermeasures and static electricity countermeasures of various electronic devices or various devices configured by incorporating electronic devices.

Conventionally, this type of surge absorber includes a pair of discharge electrodes arranged in a hermetic container having a predetermined volume while maintaining a predetermined discharge gap (see Patent Document 1).
FIG. 6 shows an example of a conventional surge absorber. The surge absorber S is provided in a base 100 made of an electrical insulating material so as to pass through a pair of lead wires 101a and 101b in an airtight manner at a predetermined interval, and the pair of lead wires 101a and 101b Discharge electrodes 102a and 102b made of iron (Fe), nickel (Ni), copper (Cu), or an alloy thereof are provided in parallel on one end side so as to surround the discharge electrodes 102a and 102b. An airtight container member 103 made of an electrical insulating material such as glass is provided on the base 100. The hermetic container member 103 is filled with a discharge gas made of an inert gas such as argon (Ar) or nitrogen (N) gas.

In the surge absorber S having the above configuration, the lead wires 101a and 101b are connected between lines of protected devices, for example, between lines of electronic devices. When a surge is applied to the line, an air discharge is generated between the discharge electrodes 102a and 102b, the surge is absorbed, and the electronic device is protected from the surge.
Japanese Patent Laid-Open No. 6-132065

  However, the above-described conventional surge absorber S is difficult to obtain a stable discharge start voltage, and when a steep surge is applied, the discharge start voltage increases, and there is a possibility that the function as a surge absorber cannot be performed sufficiently. .

  Accordingly, the present invention has been made to solve the above-described drawbacks, and an object of the present invention is to provide a surge absorber that can obtain a stable and highly accurate discharge start voltage and can accurately perform the function as a surge absorber. There is.

The surge absorber according to the present invention is a surge absorber in which a pair of rod-like discharge electrodes are disposed in parallel with each other while maintaining a predetermined discharge gap in an airtight container, and the pair of discharge electrodes includes at least the discharge electrode. the material of the inward side surfaces facing via the gap and wherein Ag, Ag alloy, a mixture der Rukoto of the Ag or Ag alloy insulator.

The surge absorber having the above configuration absorbs a surge by discharging between a pair of discharge electrodes made of Ag, Ag alloy, Ag or a mixture of an Ag alloy and an insulator having a stable discharge start voltage. For this reason, the starting voltage of the discharge is performed within a stable range within a predetermined range. Moreover, since discharge is performed between the inward side surfaces of the rod-shaped discharge electrodes that are parallel to each other, the discharge surface can be secured widely over the length direction of the discharge electrodes, and stable discharge can be performed.

In this case, not only the inwardly facing side surfaces of the pair of discharge electrodes, but also the entire surface may be composed of Ag, Ag alloy, Ag or a mixture of an Ag alloy and an insulator .
When the entire surface is made of Ag, an Ag alloy, Ag or an Ag alloy and an insulator, the entire pair of discharge electrodes may be composed of Ag, an Ag alloy, Ag or an Ag alloy and an insulator. A coating layer made of Ag, an Ag alloy, Ag or a mixture of an Ag alloy and an insulator may be provided.
Since the surge absorber having such a structure has a wide surface area composed of Ag, Ag alloy, Ag or a mixture of an Ag alloy and an insulator , a more stable discharge is performed.

The surge absorber according to the present invention can secure a wide discharge area by at least the inward side surfaces of the pair of rod-like discharge electrodes parallel to each other through the discharge gap, and the inward side surface is made of Ag, Since it is composed of Ag alloy, Ag or a mixture of an Ag alloy and an insulator , the discharge start voltage is within a stable range, and the discharge start voltage increases even when a steep surge is applied. The function as a surge absorber can be performed accurately.

Hereinafter, embodiments of the surge absorber of the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view of a surge absorber according to a first embodiment of the present invention.
In this surge absorber S1, a pair of lead wires 2a and 2b made of a conducting wire such as a dumet wire (copper-coated iron-nickel alloy wire) penetrates a base 1 made of an electrical insulating material in an airtight manner at a predetermined interval. And a predetermined length of an Ag alloy made of Ag (silver) or Ag (silver) -Cu (copper) or the like on the tip side (upper side in FIG. 1) of each lead wire 2a, 2b. The rod-shaped discharge electrodes 3a and 3b are provided in parallel with each other with a discharge gap G therebetween. That is, in the surge absorber S1 of this embodiment, rod-shaped discharge electrodes 3a and 3b made of Ag or an Ag alloy are fixedly attached to the tips of the lead wires 2a and 2b.

  Further, an airtight container member 4 made of glass or the like is fixed to the base 1 with an adhesive so as to surround the discharge electrodes 3a and 3b. In the hermetic container C surrounded by the hermetic container member 4 and the base 1, inert gas such as argon (Ar), neon (Ne), helium (He), xenon (Xe), nitrogen gas or the like is inert. A discharge gas (sealing gas) made of a gas is filled.

  In the surge absorber S1 having the above configuration, the lead wires 2a and 2b are connected between lines of protected devices, for example, between lines of electronic devices. When a surge is applied to the line, an air discharge is generated between the discharge electrodes 3a and 3b, the surge is absorbed, and the electronic device is protected from the surge. In the surge absorber S1, the discharge electrodes 3a and 3b are formed in a rod shape and are arranged in parallel to each other, and the inward side surface F that is in an opposed state is the discharge surface. Since the electrode 3a, 3b is secured in a relatively wide area over the length direction, and discharge is performed between the discharge electrodes 3a, 3b having a large area to absorb the surge, a stable discharge start voltage can be obtained. .

  In this air discharge, the discharge electrodes 3a and 3b are made of an Ag material having a stable discharge start voltage. Therefore, the discharge start voltage is within a predetermined stable range, and a steep surge is applied. Even in this case, the discharge start voltage does not increase, the function as a surge absorber can be performed accurately, a more stable discharge start voltage can be obtained, and the surface of the discharge electrodes 3a and 3b can be obtained by repeated discharge. Even if a part of the light is scattered, a stable discharge start voltage can be obtained over a long period of time.

FIG. 2 is a longitudinal sectional view of a surge absorber according to the second embodiment of the present invention. In the figure, elements common to the first embodiment are denoted by the same reference numerals, and the description is simplified.
In the surge absorber S2, the discharge electrodes 5a and 5b connected to the distal ends of the pair of lead wires 2a and 2b are rod-shaped base shafts 6a and 6b each having a predetermined length made of Fe, Ni, Cu, or an alloy thereof. 6b and coating layers 7a and 7b made of Ag or an Ag alloy are formed on the entire base shafts 6a and 6b.
In this case, the rod-like base shafts 6a and 6b are not separated from the lead wires 2a and 2b, but the lead wires 2a and 2b can be extended to serve as the base shaft.

  The coating layers 7a and 7b of Ag material on the base shafts 6a and 6b can be easily formed by performing Ag plating on the base shafts 6a and 6b. Further, it can be formed on the surfaces of the base shafts 6a and 6b by a printing method or by sputtering.

  Also in the surge absorber S2 having the above-described configuration, since the outer surfaces of the discharge electrodes 5a and 5b are made of an Ag material having a stable discharge start voltage, the discharge start voltage is performed within a stable range within a predetermined range, Even when a steep surge is applied, the discharge start voltage does not increase, and the function as a surge absorber can be accurately achieved. Further, since the Ag coating layers 7a and 7b are provided on the entire surfaces of the discharge electrodes 5a and 5b, a more stable discharge start voltage can be obtained over a wide area, and a stable discharge start voltage can be obtained over a long period of time. Can do.

3 and 4 are longitudinal sectional views of a surge absorber according to the third embodiment of the present invention.
In the surge absorber S3, the discharge electrodes 8a and 8b connected to the distal ends of the pair of lead wires 2a and 2b are rod-shaped base shafts 9a and 9b each having a predetermined length made of Fe, Ni, Cu, or an alloy thereof. In addition, coating layers 10a and 10b made of Ag or an Ag alloy are formed only on the inward side surface F that is opposed to the outer surfaces of the base shafts 9a and 9b through the discharge gap G. In the example shown in FIGS. 3 and 4, coating layers 10a and 10b are formed on the side surfaces of the discharge electrodes 8a and 8b substantially half a circumference. Also in this case, the rod-shaped base shafts 9a and 9b can be used as base shafts by extending the lead wires 2a and 2b.

  Also in the surge absorber S3 having the above-described configuration, the discharge portion of the discharge electrodes 8a and 8b is made of an Ag material having a stable discharge start voltage, so that the discharge start voltage is in a stable range within a predetermined range. Even when a steep surge is applied, the discharge start voltage does not increase, and the function as a surge absorber can be accurately achieved. In this case, since expensive Ag is coated only on the inward side surface of approximately half the circumference of the discharge electrodes 8a and 8b, the discharge electrodes 8a and 8b can be manufactured at a lower cost than when the entire discharge electrodes 8a and 8b are formed of an Ag material. it can.

The discharge characteristics of the surge absorber of the first embodiment were measured while comparing with other metals other than Ag.
FIG. 5 is a graph showing response voltage characteristics when the material of the discharge electrode is Ag, Ni, Cu, Fe. As the surge voltage, an impulse voltage that is 10 KV, which is a maximum value in 1.2 microseconds, and a half value in 50 microseconds is applied. The discharge start voltage at that time was measured as a response voltage. In FIG. 5, the response voltages are shown for each material.

  As is apparent from FIG. 5, in the case of the discharge electrode made of Ag according to the present invention, the response voltage (discharge voltage) is lower than that of the discharge electrode of other materials, and the width of the variation is also small. It can be seen that a stable and highly accurate discharge start voltage can be obtained.

In addition, this invention is not limited to the above-mentioned embodiment, In the range which does not deviate from the meaning of this invention, it can change.
For example, the discharge electrode may be composed of Ag alone, may be composed of an Ag alloy, or may be made cheaper when composed of an Ag alloy. Moreover, not only when the discharge electrode itself is composed of Ag or an Ag alloy, or when a coating layer of Ag or an Ag alloy is formed on the surface of the discharge electrode, it is sufficient if it contains Ag or an Ag alloy. You may consist of a mixture with another metal, an insulator, etc.
Moreover, in the example of each said embodiment, it is set as the structure which forms the airtight container C which accommodates a discharge electrode with the base 1 and the airtight container member 4, but if a discharge electrode can be hold | maintained in parallel, from one glass cylinder etc. The structure which makes an airtight container by squeezing, melting | dissolving both ends of the cylindrical container which becomes may be sufficient.

It is a longitudinal cross-sectional view of the surge absorber which concerns on 1st embodiment of this invention. It is a longitudinal cross-sectional view of the surge absorber which concerns on 2nd embodiment of this invention. It is a longitudinal cross-sectional view of the surge absorber which concerns on 3rd embodiment of this invention. It is a cross-sectional view of the discharge electrode according to the embodiment of FIG. 6 is a graph showing response voltage characteristics of a discharge electrode according to the present invention and a conventional discharge electrode. It is a longitudinal cross-sectional view of the conventional surge absorber.

Explanation of symbols

S1, S2, S3 Surge absorber 1 Base 2a, 2b Lead wire 3a, 3b Discharge electrode 4 Airtight container member 5a, 5b Discharge electrode 6a, 6b Base shaft 7a, 7b Coating layer 8a, 8b Discharge electrode 9a, 9b Base shaft 10a, 10b Coating layer G Discharge gap C Airtight container F Inward side

Claims (4)

A surge absorber in which a pair of rod-shaped discharge electrodes are disposed in parallel with each other while maintaining a predetermined discharge gap in an airtight container,
The pair of discharge electrodes, a surge absorber material of inward opposing sides via at least the discharge gap is characterized Ag, Ag alloy, a mixture der Rukoto of the insulator Ag or an Ag alloy. When the entire surface of the pair of discharge electrodes is a mixture of Ag, Ag alloy, Ag or Ag alloy and an insulator, the entire pair of discharge electrodes is composed of Ag, Ag alloy, Ag or Ag alloy and an insulator. The surge absorber according to claim 1, wherein the surge absorber is composed of a mixture . The surge absorber according to claim 1 or 2, wherein the pair of discharge electrodes is made of Ag, an Ag alloy, Ag, or a mixture of an Ag alloy and an insulator . The surge absorber according to claim 1 or 2, wherein the pair of discharge electrodes is provided with a coating layer made of Ag, an Ag alloy, Ag or a mixture of an Ag alloy and an insulator .

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