JPS6339924Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to high voltage variable resistors such as focus resistors used in television receivers.

Conventionally, this type of variable resistor is manufactured by supporting a substrate 2 on which a resistor is mounted inside a case 1 with a support portion 3, and passing a fixing rib 4 through a hole in the substrate 2, as shown in FIG.
The substrate 2 is fixed in the case 1 by welding the ends of the fixing ribs 4 by heating, excluding the space 7 including the part where the slider 6 connected to the rotating shaft 5 attached to the case 1 slides. Predetermined portions are molded with resin 8 for insulation and firm fixation. Note that 9 is a terminal pin soldered to the board 2, and the terminal pin 9 is protected by a terminal pin holding cover 10.

However, in such a conventional example, the solder 11 melts and the cover 10 is deformed due to heating when the resin 8 is cured, resulting in a decrease in the holding force of the terminal pin 9 and a change in the attachment state of the terminal pin 9. There were some drawbacks. For this reason, the applicant has filed a separate application for a structure in which the terminal pin 9 is arranged parallel to the board 2 and the conductive part 12 of the board 2 and the terminal pin 9 are connected by a spring 13, as shown in FIG. However, even in this case, since the terminal pin 9 is actually held only by the case 1, the case may shrink or deform due to the heat generated when the resin 8 is heated and hardened, and the terminal may be damaged. 9's holding power deteriorates,
This has drawbacks such as deterioration of the heat resistance of the space 7.

The present invention eliminates these drawbacks.

The following will explain the embodiments shown in the drawings.

3 to 5, inside a case 1 housing a substrate 2 made of ceramic or the like having a conductor forming an electrode part 14 and a resistor 15 forming a resistance part, which are applied by thick film printing and firing. A recess 16 is formed in the insertion passage for the terminal pin 9, and the terminal pin 9 is inserted between the terminal pin cover part 17 of the case 1 and the holding part 1.
8 into the inside of the case 1 , and passes through the recess 16 to reach the connection recess 19 . Connection recess 19
The spring 12 connects the terminal pin 9 and the electrode part 14 of the board 2.
It is arranged so that it is oppressed between the two. The primary fixation to the case 1 is performed by inserting the fixing rib 4 into a hole 20 made in the substrate 2 and then welding the tip of the fixing rib 4. At this time, the rotating shafts 5 and 21 are attached to the case 1 in advance, and the sliders 6 and 22 are placed on the inner ends thereof. In addition, in the case shown,
The rotating shafts 5, 21 and the sliders 6, 22 are each 2
One is for the focus resistor and the other is for the screen resistor.

A resin 8 is applied to the outer surface of the board 2 and the portion through which the terminal pin 9 is inserted, so that the board 2 is secondarily fixed, and the sliding contact portion with the sliders 6 and 22 and the connection recess 19 are coated. It is insulated and shut off from the outside air. At this time, the resin 8 is also applied to the recess 16 to mold a part of the terminal pin 9. For this reason,
The terminal pin 9 is not only held directly by the case 1 but also fixed by molded resin.

With this structure, the terminal pins of the present invention can be firmly fixed even if the case is deformed by heating during resin curing, and the reliability is high. In addition, the resin present around the terminal pins provides sufficient insulation of the internal space from the outside air, and has the effect of providing good reliability in terms of moisture resistance.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional side view of a conventional high-voltage variable resistor, and FIG. 2 is a drawing for explaining the prior art. 3 to 5 show a high voltage variable resistor embodying the present invention, FIG. 3 is an exploded perspective view, FIG. 4 is a partially sectional view, and FIG. It is an enlarged view of the part. 1... Case, 2... Board, 5, 21... Rotating shaft, 6, 22... Slider, 8... Resin, 9... Terminal pin, 15... Resistor, 16... Recess.

Claims (1)

[Scope of utility model registration request] A terminal is connected to the board by placing a board coated with a resistor in a case and molding a predetermined part with a resin coated in the case, excluding the space including the part where the slider connected to the rotating shaft makes sliding contact. In a high-voltage variable resistor in which a pin is held in a case and protruded to the outside, a recess is formed in the insertion path of the terminal pin in the case, and the resin is made to cover the recess as well. A high voltage variable resistor characterized in that a part of the pin is molded with the resin.