JPH0244481Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a high-voltage variable resistor, and in particular, a high-voltage variable resistor suitable for extracting high voltages such as focus voltages supplied to cathode ray tubes of color TV receivers, etc. Regarding resistors.

Conventionally, this type of variable resistor has an insulating substrate with a film resistor forming a fixed resistance part and a variable resistance part, and an insulating case with an opening on one side, which is supported by a rotating shaft equipped with a slider. It is constructed by housing the insulating substrate inside and molding the back side of the insulating substrate with resin. In such conventional variable resistors, the lead terminal connected to the terminal electrode of the film resistor is formed into a pin or plate shape, but in recent years, variable resistors have been integrated with flyback transformers. As the use of flyback transformers increases, in order to facilitate the connection work with high voltage coils etc. inside the insulation case of flyback transformers,
There is a demand for lead terminals to be formed from lead wires. However, if only one lead wire is pulled out, the position from which the lead wire is pulled out from the molded resin surface is not constant, and the problem arises that it is difficult to solder the lead wire to the end portion of the high voltage coil, etc. Therefore, it is necessary to fold the lead wires back into a U-shape, etc. However, since the lead wires and the molding resin are different materials, their adhesion to each other is weak, and when the lead wires are pulled, they have to be folded back. There is a problem that the lead wire comes out of the resin.

The present invention was developed in view of these points, and is a high-voltage product that increases the tensile strength of lead terminals made of lead wires, and has lead terminals with a shape that facilitates automation of lead wire forming. The purpose is to provide a variable resistor.

For this purpose, the present invention changes the shape of the lead terminal formed by the lead wire so that the lead wire pulled out to the outside of the resin is folded back, and at the same time, a retaining part is attached to the folded tip inside the resin. It is characterized by having been formed.

An embodiment of the present invention will be described below in detail with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a rectangular insulating substrate made of alumina porcelain or the like, and as shown in FIG. A center electrode 5 is provided at the center surrounded by the arc-shaped film resistor 4, and a protective resistor is connected to the center electrode 5. A film resistor 6 is provided. Terminal electrodes 7, 8, and 9 are connected to the ends of these film resistors 2, 3, and 6, and through holes 10, 11, and 12 are formed in the portions of the substrate where the respective terminal electrodes are located. 13, 14, 15 are the insulating substrates 1
A lead terminal consisting of a lead wire inserted through the through holes 10, 11, 12, one end of each of which is soldered to the terminal electrodes 7, 8, 9 on the front side of the board, and also located on the back side of the board 1. The portion is folded back into a U-shape or the like, and the folded end portion is bent into an L-shape to form the retaining portions 13a and 14.
a, 15a are formed. Reference numeral 16 denotes an insulating case with an opening on one side, in which the insulating substrate 1 is housed with the surface side on which the film resistor is provided facing the inner bottom surface of the case. A cylindrical cavity 17 and a bearing 18 communicating with the cavity are formed at a position facing the film resistor 4. In addition,
When storing the substrate 1 in the case 16, for example, a rib 19 is provided protrudingly on the inner bottom surface of the case 16 at a position corresponding to substantially the entire outer periphery of the insulating substrate 1, and an adhesive is placed on the rib 19. The substrate 1 may be placed and fixed. 20 is the case 16
A rotary shaft that is rotatably inserted into the bearing section 18 of the case 16 and has a flange section 21 disposed in the hollow section 17 at one end thereof. A slider 22 is attached to slide on the arc-shaped film resistor 4. The rotating shaft 20 and the bearing section 18
Grease 23 is applied as necessary between the two to provide airtightness and lubricity. Reference numeral 24 denotes a resin molded over the entire opening of the case 16 on the back side of the insulating substrate 1, and the lead terminals 13, 14,
15, the folded portion thereof is exposed to the outside of the resin 24, and the tip portions are provided with retaining portions 13a, 14a, 15a.
is embedded inside the resin 24.

The high-voltage variable resistor of the present invention is constructed as described above, but its distinctive feature lies in the configuration of the lead terminals, so the configuration of other parts can be changed as appropriate. . For example, a configuration may be adopted in which two arc-shaped film resistors forming the variable resistance section are successively provided on the same insulating substrate, and the screen voltage as well as the focus voltage is extracted at the same time. Furthermore, the retaining portion of the lead terminal is not limited to the one formed in the L-shape of the above embodiment, but may also be formed by folding the tip of the lead terminal into an arc shape, as shown in FIG. As shown in FIG. 4, the tip of the lead terminal may be processed into a header, or the tip of the lead wire may be folded back into an L-shape, although not shown. Furthermore, even when folding into an L-shape as shown in the first figure, the bending direction can be inward instead of outward as shown.

As explained above, in the high-voltage variable resistor of the present invention, the lead terminal formed by the lead wire is folded back to the outside of the resin, and the folded end inside the resin is folded back. Since the shape has a retaining part formed in the part,
In addition to increasing the tensile strength of the lead terminal,
Its simple shape makes it easy to automate forming, and since it is formed into a fixed shape, the position of pulling it out from the mold resin surface is almost constant, making it easy to solder connect to the end of the high-voltage coil, etc. It has various excellent effects such as making it easier to use.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view of a main part of a high-voltage variable resistor according to an embodiment of the present invention, Fig. 2 is a plan view of an insulating substrate used in the variable resistor of the present invention, and Figs. 3 and 4 are It is a figure which shows the other example of the shape of the lead terminal used for the variable resistor of this invention. 1... Insulating substrate, 2, 3, 4, 6... Film resistor, 5... Center electrode, 7, 8, 9... Terminal electrode,
10, 11, 12... through hole, 13, 14, 15...
... Lead terminal, 16 ... Insulation case, 17 ... Cavity part, 18 ... Bearing part, 19 ... Rib, 20 ...
Rotating shaft, 21... flange portion, 22... slider,
23...Grease, 24...Resin.

Claims (1)

[Scope of utility model registration request] An insulating substrate having a film resistor and a terminal electrode connected to the film resistor on its surface is supported by a rotating shaft having a slider that slides on the film resistor. A high-voltage device is housed in a shaped insulating case, and a resin is molded on the back side of the insulating substrate inside the insulating case, and lead terminals connected to terminal electrodes of the insulating substrate are drawn out to the outside of the resin. The lead terminal is made of a lead wire, and the lead wire pulled out to the outside of the resin is folded back,
A high-voltage variable resistor, characterized in that a retaining portion is formed at the folded end inside the resin.