JPS6228077Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is intended for use in electron tube sockets, particularly at the connection portion between an external lead-in wire (hereinafter simply referred to as a pin) and an external lead-in wire insertion portion (hereinafter simply referred to as a receptacle) through which low voltage and large current flow in and out. This invention relates to an electron tube socket that minimizes electrical contact resistance.

In general, in electron tubes such as cathode ray tubes, heaters and filaments, for example, have traditionally operated at relatively lower voltages and higher currents than other electrode members. As shown in the front view, among the plurality of pins 2 fixedly arranged in a circular shape on the stem 1, the heater and filament pins have the same dimensions and shape as the other electrode pins, and are arranged in a predetermined pin circle. They are permanently installed and arranged. On the other hand, the socket used for this electron tube is
As shown in Fig. 2 a, b and Fig. 3 a, b, a side view of the main part and a front view of the main part of a socket for industrial use, equipment, and equipment, all the pins 2 can be inserted at the same time. The structure of the receptacle 4 implanted in the socket 3 is also completely connected to the pin 2, as shown in the side view and top view of the main part in FIGS. 4 to 6 a and b. The same shape is used corresponding to the shape of.

However, in the electron tube socket having the above structure, when an electron tube whose heater and filament operate at a lower voltage and higher current than the conventional electron tube is used in combination with the socket 3, the pin 2 and the socket The potential drop caused by the electrical contact resistance between the electron tube 3 and the receptacle 4 has been an extremely large obstacle to the operation of the electron tube. That is, to explain using the equivalent circuit shown in FIG. 7, first, if there is a contact resistance value r ₁ between pin 2 and receptacle 4, a potential drop of I × r ₁ , which is the product of the circuit current I, will occur. occurs, and only the voltage of the true potential E ₁ obtained by subtracting I×r ₁ from the supply voltage E ₀ is applied to the heater and filament. Since this contact resistance r ₁ always has an unstable factor and does not keep a constant value,
If a value of r ₁ exists from the beginning, sometimes r ₁ becomes zero or increases several times, and the true applied potential E ₁ increases or decreases accordingly. Also, the current amount is r ₁
When something that was zero sometimes increases,
The true applied potential E ₁ becomes the supply voltage E ₀ or a value decreased from the supply voltage E ₀ . The effect of this increase/decrease in contact resistance becomes greater as the voltage and current method becomes lower. For example, the heater or filament of an electron tube is heated by applying a specified voltage, and by obtaining and maintaining an appropriate thermionic emission by obtaining an appropriate cathode temperature, the true applied voltage E ₁ has an important role. Therefore, if the applied voltage is lower than or higher than the true applied voltage _E1 , the normal function and reliability thereof will be impaired. In addition, in the manufacturing process, testing, and inspection process of electron tubes,
Since one socket is used for a large number of electron tubes, it is easy to cause insufficient contact due to wear and contamination, and changes and deviations in the contact area over time. There are deviations in contact resistance values due to production, changes in contact resistance values due to vibration shock and aging.
In this situation, when dealing with low-voltage, high-current type electron tubes, this problem could not be solved by improving the surface metal material and pressing force of the receptacle 4 of the conventional socket 3.

Therefore, the purpose of the present invention was to focus on the above points, and to calculate the contact resistance value only at the connection between the pin of the electron tube through which low voltage and large current flows and its receptacle. It is an object of the present invention to provide an electron tube socket which has high reliability and easy maintenance by minimizing .

In order to achieve this object, the electron tube socket according to the present invention has a receptacle corresponding to a pin through which a low voltage and large current flows in and out, and has a contact resistance value lower than that of other parts. Hereinafter, the electron tube socket according to the present invention will be explained in detail with reference to the drawings.

8 to 11 are top views of main parts showing an embodiment of the electron tube socket according to the present invention, and the same symbols as in FIGS. 2a, b to 3 a, b are the same elements, so explanations thereof will be given is omitted. In FIGS. 8 and 9, first, the surrounding area of the socket body 13 where the receptacle 4 corresponding to the inflow and outflow of low voltage and large current is implanted is shown in FIG.
For the adjacent pins 2, as shown in FIG. 13a and 13b, or alternatively A and B in FIGS. 10 and 11.
A cutout hole 1 passing through the socket 3 as shown in
3c and 13d are formed. On the other hand, these blank holes 13a and 13b and the notch hole 13
For the through holes c and 13d, as shown in FIGS. 12 to 14, corresponding to the dimensions and shapes, the low Single or integrated connectors 7, 8, in which a receptacle 5 made of a surface metal with contact resistance is implanted and a lead wire 6 is attached before or after.
9. An example of the contact structure between the receptacle 5 and the pin 2 is shown in FIG. That is, as an example of the receptacle 5 implanted in the connectors 7, 8, and 9 is shown in FIG. 15, the tip of the hole into which the pin 2 is inserted is formed thin, and It has a configuration with radial notches.

In the electron tube socket constructed in this manner, when the socket body 13 is attached to the electron tube, after inserting the socket body 13 shown in FIGS. 8 to 11 into the stem 1 of the electron tube, 13a, 13b or notch holes 13c, 1
Insert the connectors 7 and 8 or the integrated connector 9 shown in FIGS. 12 and 13 from the rear into the through hole 3d.
Insert and attach. In this case, connector 7~
As mentioned above, the receptacle 5 implanted in the receptacle 9 is strong in the direction of its central axis because the tip of the hole into which the pin 2 is inserted is thin and has radial notches in the axial direction. Because it has spring properties, it is inserted by scraping off the oxide film formed on the surface of pin 2 of the filament, a low-voltage, high-current heater, and is pressed into contact with the filament with sufficient pressure, resulting in low resistance due to the high contact area. It will be electrically connected to the pin 2 by contact. Therefore, potential drop due to contact resistance can be minimized with respect to the inflow and outflow of low voltage and large current.

As explained above, according to the electron tube socket of the present invention, by making the contact resistance type between the pin and the receptacle into which the pin is inserted into contact, the potential drop that was an obstacle between the two can be minimized. This makes it possible to improve the reliability of the electron tube, and also facilitates maintenance in that only the connector part needs to be replaced when it is replaced due to wear during the manufacturing test or inspection process of the electron tube. You can get extremely good results.

[Brief explanation of the drawing]

Figures 1a and b show a pin fixed to the electron tube stem, a side view of the main part and a front view of the main part showing an example of a conventional cap for the pin, and Figs. 2a and b show a conventional industrial electronic A side view of a main part and a front view of a main part showing an example of a tube socket; FIGS. , b to Fig. 6 a and b are a side view and a top view of the main part showing an example of a conventional receptacle, Fig. 7 is an electrical equivalent circuit diagram of the connection part between the pin and the receptacle, and Figs. 8 and 9. The figure is a top view of main parts showing an example of an electron tube socket according to the present invention.
0 and 11 are top views of essential parts showing other embodiments of the electron tube socket according to the present invention, and FIGS. 12 to 14
The figure is a perspective view of a main part showing an example of a connector to be inserted into an electron tube socket according to the present invention, FIG. FIG. 3 is a cross-sectional view showing a contact structure between a receptacle and a pin. 1...Stem, 2...Pin, 3...Socket,
13a, 13b...bum hole, 13c, 13d...
...Notch hole, 4... Receptacle, 5... Receptacle, 13... Socket body.

Claims (1)

[Scope of utility model claims] A socket for an electron tube that is electrically connected by inserting and contacting a plurality of pins fixedly arranged in a circular shape on the stem of an electron tube with a socket in which a receptacle is implanted corresponding to the arrangement of the pins. In the socket, the socket has a structure including a socket body and one or more connectors that constitute the socket by engaging with a hole or a notch passing through the socket body, and The implanted receptacle has a hole into which the pin is inserted, and has a narrow tip and has radial notches in the axial direction, and has a lower contact resistance with the pin than a receptacle implanted in the socket body. A socket for an electron tube characterized by having a contact structure with a small contact angle.