JPS5857881B2 - oxide negative resistor - Google Patents

Description

[Detailed description of the invention] The present invention relates to improvements in oxide negative resistors.

The following structures of conventional oxide negative resistors are known.

That is, the oxide negative resistance element has a pair of electrodes provided on both main surfaces of the oxide negative resistance element, and a lead wire is fixed to both electrodes by solder, and the oxide negative resistance element is provided with a pair of electrodes on both main surfaces of the oxide negative resistance element. The structure is covered or molded with resin or the like.

However, when the oxide negative resistance element is energized, its surface temperature easily reaches the melting point of the solder, which not only damages the electrical connection between the electrode and the lead wire, but also deteriorates the epoxy resin, resulting in poor reliability. It could not function as a high oxide negative resistor.

In view of the above points, the present invention aims to provide a highly reliable oxide negative resistor.

The present invention provides an oxide negative resistance element with electrodes provided on both main surfaces,
A first lead terminal having a metal stem on which the oxide negative resistance element is installed and electrically connected to one electrode and electrically connected to the other electrode of the oxide negative resistance element. and a second lead terminal provided with an elastic spring portion for crimping and supporting the oxide negative resistance element between the metal stem and the oxide negative resistance element, the elastic spring portion, and at least one of the second lead terminals. This is an oxide negative resistor whose portion is sealed by a metal stem and which is separated from a metal sealed tube from which the second lead terminal is insulated.

The present invention will be described below with reference to FIG. 1, which shows a cross-sectional view of a configuration example.

The oxide negative resistance element 10 has electrodes 2 and 3 provided on both sides of the oxide negative resistance element body 1 by baking or other means.
The lead terminal 11 is placed on the metal stem 12 to which the lead terminal 11 is connected so as to be electrically connected to one electrode of the oxide negative resistance element.

Further, a second j-de terminal 1 is provided with an elastic spring material 13 that is electrically connected to the other electrode of the oxide negative resistance element.
4 is fixed by a metal sealing tube 15 and a hermetic seal portion 16.

Note that the oxide negative resistance element 10 is supported by compression between the metal stem 12 and the elastic spring portion 13 .

The metal sealing tube 15 and the metal stem 12 are sealed together by resistance welding, and if necessary, gas can be filled in the metal sealing tube 15 to prevent oxidation of the electrodes 2 and 3.

In the embodiment, resistance welding is used as a means for sealing the metal sealing tube and the metal stem, but the sealing may be performed by other means.

As described above, the resistor according to the present invention has a reliable oxidation structure that ensures reliable connection between electrodes and lead terminals, and can prevent oxidation of the electrodes by filling an appropriate gas in the metal sealed tube. It can be said to be a material negative resistor.

For example, according to experiments conducted by the present inventors, the following tendency is observed.

That is, a resistor (comparative example) in which a lead wire was attached to an oxide negative resistance element by soldering was used together with an example of the present invention.
A current of 0 to 100 mA (50 Hz A, C) was applied to each sample for 5 minutes, and the peeling rate of the electrodes was measured for 50 samples. The results are shown in Figure 2.

As a result of the above measurement, as shown in Fig. 2, in the case of the comparative example (curve B), the electrode peeled off at about 75 mA, but in the case of the example of the present invention (curve A), the electrode did not peel off even at about 100 mA. Almost never occurred.

In other words, the reliability of the resistor of the present invention can be improved.

In addition, the heat generated when the oxide negative resistance element is energized can be effectively dissipated by using metal materials with excellent heat conductivity as the metal sealing tube and metal stem, and the assembly process is also simplified. It also has advantages.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a configuration example of the present invention, and FIG. 2 is an explanatory diagram showing the electrode peeling rate with respect to the current flow of an example according to the invention and a comparative example. 10... Oxide negative resistance element, 12...
・Metal stem, 13...Elastic spring part, 11,1
4...Lead terminal, 15...Metal sealed tube, 16...Hermetic seal portion.

Claims (1)

[Claims] 1. an oxide negative resistance element provided with electrodes on both main surfaces; a first lead terminal having a metal stem on which the oxide negative resistance element is installed and electrically connected to one electrode; a second lead terminal electrically connected to the other electrode of the oxide negative resistance element and provided with an elastic spring portion that crimply supports the oxide negative resistance element between the metal stem; a material negative resistance element, an elastic spring portion and at least a second
An oxide negative resistor, characterized in that a part of the lead terminal is hermetically sealed with a metal stem, and a second lead terminal is sealed with a metal sealed tube from which the second lead terminal is insulated.