JPH0528724Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Field of Application> This invention relates to a high voltage variable resistor used in electronic circuits.

<Prior art> Fig. 5 shows an example of a conventional high-voltage variable resistor, in which 1 is a case made of hard plastic, etc., and a boss 2 is integrally formed on the surface of the case. Attach the rotating shaft to. 4 is an insulating substrate made of alumina or the like, and a resistor 9 constituting a variable resistor is formed on the inner surface.

A flange 5 is integrally formed on the inner end of the rotating shaft 3, and a slide electrode 6 is provided on the flange 5,
This slide electrode 6 is brought into contact with the resistor 9 of the substrate 4.

Further, a plurality of terminals 7 protrude from the outer surface of the substrate 4 in order to connect the resistor 9 to an external circuit.

Reference numeral 8 denotes a sleeve made of hard plastic, etc. This sleeve 8 is placed over the terminals 7 arranged on the left and right, its inner end is brought into contact with the board 4, and then an epoxy resin is applied to the board 4 at the opening of the case 1. The resin is poured in liquid form and allowed to harden to form a layer 10 of hard resin, and each sleeve 8 is fixed together by the layer 10.

Then, each terminal 7 is electrically and mechanically connected by directly inserting it into a connector or the like provided in a circuit of an electronic device using a sleeve 8.

Further, an insulated wire connected to a circuit of an electronic device is soldered to each terminal 7, and the sleeve 8 is covered with a rubber cap or the like to insulate and protect the soldered portion.

<Problems to be solved by the invention> In the conventional high-voltage variable resistor as described above, the sleeves 8 that cover the terminals 7 are each independent, so it is necessary to cover the sleeves 8 before forming the resin layer 10. If the terminal 7 is tilted when standing on the board 4, the sleeve 8 will also be tilted.

Further, even when the terminal 7 is not tilted, the sleeve 8 may be tilted, and therefore the terminal 7 may also be tilted.

If the resin layer 10 is formed with the terminals 7 and sleeves 8 slanted in this way, the terminals 7 and sleeves 8 will be fixed with the slants, and the spacing between the tips of adjacent terminals 7 and sleeves 8 will be distorted, making it unsightly. At the same time, there was a problem in that when the connector was inserted into a mating connector, the insertion was hindered.

<Means for solving the problem> This invention was made in order to solve the above problems. The sleeves are joined together by a connecting portion, and this connecting portion is embedded in a resin layer.

1 and 2 show an embodiment of the present invention, and include a case 1, a boss 2, a rotating shaft 3 and a flange 5 at its inner end, a substrate 4 and a resistor 9 formed thereon,
The slide electrode 6 fixed to the flange 5, the plurality of terminals 7 fixed to the substrate 4, etc. are the same as those in the conventional example shown in FIG.

In the case of this embodiment, a plurality of sleeves 8, for example two sleeves 8 to be placed over the terminals 7, are connected together by a connecting portion 11.

That is, as shown in FIG. 3, the lower portions of the left and right sleeves 8 are integrally connected by the connecting portion 11, but when these sleeves 8 and the connecting portion 11 are integrally formed, the left and right sleeves 8 are accurately parallel to each other. Also, make sure that the bottom part is exactly perpendicular and horizontal to the sleeve 8.

Insert the left and right sleeves 8 formed as described above into the left and right terminals 7 protruding from the surface of the board 4, and place them on the board 4 with the bottoms of the left and right sleeves 8 in close contact with the surface of the board 4. When a liquid epoxy resin is poured and cured, each sleeve 8 is fixed onto the substrate 4 by the resin layer 10 together with the connecting portion 11 embedded in the resin layer 10.

In the embodiment, each terminal 7 is a flat terminal with a hole at its tip, but it may also be a round pin terminal.
Further, the connecting portion 11 of the sleeve 8 may be formed at a position slightly above the bottom of each sleeve 8, as shown in FIG.

<Effects> As described above, the high voltage variable resistor of this invention combines the sleeves that cover the terminals protruding from the case into one body by the connecting part, so that each of the combined sleeves is aligned with the board in accurate parallelism. Since the perpendicularity to the board can be maintained accurately, even if the terminals on the board are slightly tilted, this is corrected by each sleeve of this invention, so each sleeve is fixed in an accurate state.

Therefore, the appearance is not damaged, and even when the terminal of the high-voltage variable resistor of this invention is inserted into the connector of a mating circuit, the sleeve can be inserted into the connector extremely smoothly.

Additionally, in the past, a sleeve had to be attached to each terminal, which was extremely time-consuming.
With this invention, multiple sleeves can be attached at the same time, improving efficiency.

Furthermore, since the connecting portion of the sleeve is embedded in the resin layer, the fixing strength of the sleeve in the resin layer is further improved, and the sleeve becomes stronger against tensile forces applied from the outside.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing one embodiment of this invention, Fig. 2 is a vertical side view of the same as above, Figs. 3 and 4 are perspective views showing each side of the sleeve, and Fig. 5 is a conventional high voltage FIG. 3 is an enlarged cross-sectional view showing an example of a variable resistor. 1... Case, 4... Board, 7... Terminal, 8...
...Sleeve, 11...Connection part.

Claims (1)

[Scope of utility model registration request] A board is fixed to a case made of plastic or the like, and a slide electrode is attached to the inner end of a rotating shaft attached to the case to contact a resistor provided on the board, and a plurality of terminals are made to protrude from the board. In a high-voltage variable resistor, a sleeve is placed over a specified one, the tips of the terminals are made to protrude from the outer end of the sleeve, and a resin layer made by pouring and hardening liquid resin onto the substrate in the opening of the case is used. A high voltage variable resistor, characterized in that a plurality of predetermined sleeves are integrally connected to each other by a connecting portion, and the connecting portion is embedded in a resin layer.