JP2937176B2 - High-voltage variable resistor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-voltage variable resistor suitable for supplying a high voltage to a cathode ray tube such as a TV receiver.

[0002]

2. Description of the Related Art Hitherto, as this kind of high-voltage variable resistor, those having a structure as shown in FIGS. 7 to 9 have been proposed. 7 is a sectional side view of a main part of the high-voltage variable resistor, FIG. 8 is a partial plan view of the high-voltage variable resistor, and FIG. 9 is an enlarged cross-sectional view taken along line AA of FIG. That is, the high-voltage variable resistor shown in FIGS. 7 to 9 includes an insulating case 1 made of a resin having an opening on one surface side, an insulating substrate 2 made of alumina or the like housed in the insulating case 1,
A rotating shaft 3 supported by an insulating case 1;
And a lead terminal fixing projection 5 integrally formed on the flange 4 at one end on the side of the opening.

Although not shown, the insulating substrate 2 is
A film resistor forming a variable resistance portion and a fixed resistance portion and a terminal electrode connected to the film resistor are formed on a surface facing the bottom of the insulating case 1.

Although not shown, the rotating shaft 3 has a bulging portion formed in a portion located inside the insulating case 1, and the bulging portion slides on the film resistor on the surface of the insulating substrate 2. A moving slider is mounted.

The lead terminal fixing protrusion 5 has a lead terminal arrangement groove 6 formed from the inside to the outside of the insulating case 1, and a first lead terminal 7 is arranged in the lead terminal arrangement groove 6. Fixed. The lead terminal arrangement groove 6 includes a lead terminal storage portion 6a and an opening 6b formed continuously with the lead terminal storage portion 6a and communicating with the upper surface of the lead terminal fixing projection 5. The lead terminal housing 6a is formed to have substantially the same diameter as the first lead terminal 7,
One end side is located inside the insulating case 1, and the other end side is arranged in the lead terminal housing 6 a so as to be drawn out to the outside of the insulating case 1. Opening 6b
Is formed to have a width smaller than the diameter of the first lead terminal 7 so that the first lead terminal 7 arranged in the lead terminal storage portion 6a does not come off to the upper surface side of the lead terminal fixing projection 5. I have.

In order to arrange the first lead terminal 7 in the lead terminal receiving portion 6a of the lead terminal arrangement groove 6 formed in the lead terminal fixing projection 5, first, as shown in FIG. The terminal 7 is placed on the lead terminal fixing protrusion 5 along the opening 6b. Then, when a force is applied to the first lead terminal 7 from above in the direction of the arrow, the lead terminal fixing projections 5 are pushed out on both sides of the opening 6b, and the first lead terminal 7 is moved to the lead terminal storage portion 6a. Fit in. The first lead terminal 7 once fitted into the lead terminal storage portion 6a does not fall out on the upper surface side of the lead terminal fixing projection 5.

A conductive rubber 8 is disposed inside the insulating case 1 in contact with a terminal electrode (not shown) of the insulating substrate 2. The conductive rubber 8 has a second lead terminal 9. Is inserted through the insulating substrate 2. The other end of the second lead terminal 9 is led out to the opening of the insulating case 1 and is connected to one end of the first lead terminal 7 above the opening by means such as soldering.

A resin 10 is cast on the opening side of the insulating case 1 in a final step. The high-voltage variable resistor configured as described above is provided with other lead terminals as necessary, but is not shown.

[0009]

In the high-voltage variable resistor configured as described above, the first lead terminal 7 is fixed to the lead terminal fixing projection 5. However, when the other end of the second lead terminal 9 is connected to one end of the first lead terminal 7, the first lead terminal 7 is moved in the vertical direction (the insulating case 1).
(The direction connecting the opening to the bottom) is easily applied, and the opening 6b of the lead terminal arrangement groove 6 formed in the lead terminal fixing projection 5 has a shape such that the first lead terminal 7 does not come off. Although it is in the upward direction (insulating case 1
Therefore, when a large force (in the direction of the opening connecting the opening and the bottom) is applied, there is a problem that the first lead terminal 7 comes off from the lead terminal fixing projection 5.
An object of the present invention is to provide a high-voltage variable resistor that prevents the first lead terminal from coming out of the lead terminal fixing projection even when a large upward force is applied to the first lead terminal. And

[0010]

In order to achieve the above object, in the high-voltage variable resistor according to the present invention, the lead terminal fixing projection is provided with a lead terminal housing extending from the inside to the outside of the insulating case. A lead terminal arrangement groove is formed, which is formed by a portion and an opening communicating with the side surface of the lead terminal fixing projection.

Since the opening of the lead terminal arrangement groove is formed so as to communicate with the side surface of the lead terminal fixing protrusion, a large upward force is applied to the first lead terminal fixed to the lead terminal fixing protrusion. However, the first lead terminal does not fall out of the lead terminal fixing projection.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a sectional side view of an essential part of a high-voltage variable resistor according to the present invention. FIG. 2 is a partial plan view of the high-voltage variable resistor.
FIG. 3 is an enlarged sectional view taken along line AA of FIG. In these figures, the same parts as those of the conventional example shown in FIGS. 7 to 9 are denoted by the same reference numerals, and detailed description thereof will be omitted.

That is, the high-voltage variable resistor of the present invention comprises:
An insulating case 1 made of a resin having an opening on one surface side;
An insulating substrate 2 made of alumina or the like housed in the insulating case 1, a rotating shaft 3 supported by the insulating case 1,
A lead terminal fixing protrusion 11 is integrally formed on the flange 4 at one end of the insulating case 1 on the opening side.

The lead terminal fixing protrusion 11 is formed with a lead terminal arrangement groove 12 communicating from the inside to the outside of the insulating case 1. This lead terminal arrangement groove 12
Lead terminal storage part 12a for arranging first lead terminal 7
And an opening 1 communicating with a side surface of the lead terminal fixing projection 11 formed continuously with the lead terminal storage portion 12a.
2b.

The lead terminal accommodating portion 12a is formed to have substantially the same diameter as the first lead terminal 7, and the first lead terminal 7 is disposed in the lead terminal accommodating portion 12a as in the conventional example. The opening 12b is formed to have a width smaller than the diameter of the first lead terminal 7, and the first lead terminal 7 disposed in the lead terminal accommodating portion 12a has the lead terminal fixing protrusion 11 formed therein.
So that it does not escape to the side of the camera.

A method of arranging the first lead terminal 7 in the lead terminal accommodating portion 12a of the lead terminal arranging groove 12 formed in the lead terminal fixing projection 11 is, for example, such that the opening of the insulating case 1 is in the horizontal direction. Terminal arrangement groove 1 formed on lead terminal fixing protrusion 11 by rotating 90 ° as described above.
The second opening 12b may be directed upward, and may be performed in the same manner as in the conventional example. That is, although not shown, the first
When the lead terminal 7 is placed along the opening 12b and a force is applied to the first lead terminal 7 from above, the opening 12b is pushed open, and the first lead terminal 7 fits into the lead terminal storage portion 12a. It will be crowded. Once the lead terminal storage section 1
The first lead terminal 7 fitted in the second opening 2a has an opening 12b.
Are prevented from coming off from the lead terminal fixing projections 11.

The first lead terminal 7 fixed to the lead terminal fixing projection 11 as described above has the same structure as the conventional example.
The other end of the second lead terminal 9 is connected to one end thereof. In this embodiment, one end of the second lead terminal 9 is inserted into the conductive rubber 8. However, one end of the second lead terminal 9 may be directly soldered to the terminal electrode of the insulating substrate 2.

As shown in FIG. 1, when one end of the first lead terminal 7 located inside the insulating case 1 is bent in an L shape, as shown in FIG. If the locking portion 13 is provided on the inner side of the insulating case 1 of the projection 11 and the lead terminal fixing projection 11 with an interval corresponding to the wire diameter of the first lead terminal 7, the first lead terminal 7 can be prevented from moving in the direction along the lead terminal arrangement groove 12. As shown in FIG. 5, the locking portion 13 may be formed so as to be connected on the side surface side opposite to the lead terminal fixing projection 11 and the opening 12b.

Further, when the locking portion 13 is formed, if one end of the first lead terminal is formed on the locking portion 13 as shown in FIG. Can be prevented from rotating around the portion located at the center.

Further, in the above embodiment, the lead terminal fixing projection 11 is formed on the flange 4 formed at one end of the insulating case 1 on the opening side, but is not limited to this. Instead, it may be formed on the side wall of the insulating case 1.

[0022]

As described above, in the high-voltage variable resistor according to the present invention, the opening of the lead terminal arrangement groove formed in the lead terminal fixing projection is formed so as to communicate with the side surface of the lead terminal fixing projection. Even if a large upward force is applied to the first lead terminal, the first lead terminal does not come off from the lead terminal fixing projection.

[Brief description of the drawings]

FIG. 1 is a sectional side view of a main part of a high-voltage variable resistor according to an embodiment of the present invention.

FIG. 2 is a partial plan view of the high-voltage variable resistor shown in FIG.

FIG. 3 is an enlarged cross-sectional view of the high-voltage variable resistor shown in FIG. 2 along the line AA.

FIG. 4 is a partial sectional side view of a high-voltage variable resistor according to another embodiment of the present invention.

FIG. 5 is an enlarged perspective view showing only a lead terminal fixing protrusion of a high voltage variable resistor according to still another embodiment of the present invention.

FIG. 6 is a partial sectional side view of a high-voltage variable resistor according to another embodiment of the present invention.

FIG. 7 is a sectional side view of a main part of a conventional high-voltage variable resistor.

8 is a partial plan view of the high-voltage variable resistor shown in FIG.

FIG. 9 is an enlarged cross-sectional view of the high-voltage variable resistor shown in FIG. 8 along the line AA.

FIG. 10 is an enlarged cross-sectional view of the same position as FIG. 9 for explaining a direction in which the first lead terminal is disposed in a lead terminal receiving portion of a lead terminal placement groove formed in a lead terminal fixing protrusion.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Insulating case 2 Insulating substrate 3 Rotating shaft 4 Flange 7 First lead terminal 8 Conductive rubber 9 Second lead terminal 10 Resin 11 Lead terminal fixing projection 12 Lead terminal arrangement groove 12a Lead terminal storage portion 12b Opening 13 Stop

Claims (1)

(57) [Claims] An insulating case having an opening on one surface side, an insulating substrate housed in the insulating case, a rotating shaft supported by the insulating case, and one end of the insulating case on the opening side. And a first terminal fixed to the lead terminal fixing projection, one end of which is located inside the insulating case, and the other end of which is pulled out to the outside of the insulating case. A high-voltage variable resistor in which a second lead terminal led out from the insulating substrate is connected to one end of the first lead terminal. The lead terminal arrangement groove is formed by a lead terminal housing portion communicating from the inside to the outside of the insulating case and having an opening communicating with the side surface of the protrusion for fixing the lead terminal. The opening that is formed and communicates with the side surface of the lead terminal fixing protrusion is formed in a shape that prevents the first lead terminal disposed in the lead terminal storage portion from coming out to the side surface of the lead terminal fixing protrusion, The high-voltage variable resistor according to claim 1, wherein the first lead terminal is disposed and fixed in a lead terminal receiving portion of a lead terminal placement groove formed in the lead terminal fixing projection.