JPH0714605U - Variable resistor for high voltage - Google Patents

Abstract

(57) [Abstract] [Purpose] In a high-voltage variable resistor, the lead terminal can be reliably positioned on the protrusion, and the lead terminal can be easily arranged in the lead terminal housing of the groove formed in the protrusion. To do so. [Structure] A protrusion 10 for positioning a lead terminal 9 is formed on a collar 5 of an insulating case 1 made of resin that constitutes a high voltage variable resistor, and the lead terminal 9 is arranged on the protrusion 10. The portion 11a, the opening communicating with the upper surface of the protrusion 10 and the elastic forming recess 1 for imparting elasticity to the protrusion 10.
1c is formed, and the opening is formed in a shape that prevents the lead terminal 9 from slipping out from the upper surface of the protrusion 10. The lead terminal 9 is formed in the groove 11 formed in the protrusion 10. 11a for positioning.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a high voltage variable resistor incorporated in a flyback transformer or the like.

[0002]

[Prior art]

 Conventionally, as a high-voltage variable resistor of this type, one having a structure as shown in FIGS. 9 to 11 has been proposed. 9 is a sectional side view of a main part of the high voltage variable resistor, FIG. 10 is a partial plan view of the high voltage variable resistor, and FIG. 11 is an enlarged sectional view taken along the line AA of FIG. That is, the high voltage variable resistor shown in FIGS. 9 to 11 includes an insulating case 1 made of resin having an opening on one surface side, an insulating substrate 2 made of alumina or the like housed in the insulating case 1, It consists of a rotating shaft 3 supported by the insulating case 1 and a resin 4 cast on the opening side of the insulating case 1.

Although not shown in the drawings, the insulating substrate 2 has a film resistor forming a variable resistance portion and a fixed resistance portion on a surface of the insulating case 1 facing the bottom surface of the insulating case 1, and the film resistor. And a terminal electrode connected to.

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

A flange 5 is integrally formed at one end on the opening side of the insulating case 1, and a protrusion 6 is formed on the upper surface side of the flange 5. The protrusion 6 is formed with a groove 7 that communicates from the inner side of the insulating case 1 to the outer side.

Further, the conductive rubber 8 is arranged inside the insulating case 1 in contact with a terminal electrode (not shown) of the insulating substrate 2, and one end side of the lead terminal 9 is inserted into the conductive rubber 8. It is rare. The other end side of the lead terminal 9 is led out to the opening side of the insulating case 1 and is arranged and positioned in the groove 7 of the protrusion 6.

The groove 7 formed in the protrusion 6 is composed of a lead terminal housing portion 7a and an opening portion 7b formed continuously with the lead terminal housing portion 7a and communicating with the upper surface of the protrusion 6. The lead terminal housing portion 7a is formed to have substantially the same diameter as the lead terminal 9, and the lead terminal 9 is arranged in the lead terminal housing portion 7a. The opening 7b is formed with a width smaller than the diameter of the lead terminal 9 so that the lead terminal 9 arranged in the lead terminal housing 7a does not come out to the upper surface side of the protrusion 6.

In order to arrange the lead terminal 9 in the lead terminal housing portion 7a of the groove 7 formed in the protrusion 6, as shown in FIG. 12, first, the lead terminal 9 is placed on the upper surface of the protrusion 6 along the opening 7b. Put. Then, when a force is applied from above the lead terminal 9 in the direction of the arrow, the projection 6 is spread out on both sides of the opening 7b and the lead terminal 9 is fitted into the lead terminal accommodating portion 7a. The lead terminal 9 once fitted in the lead terminal housing portion 7a does not come out to the upper surface side of the protrusion 6. In this way, the work of arranging the lead terminal 9 in the lead terminal housing portion 7a of the groove 7 formed in the protrusion 6 is performed simultaneously with the work of inserting one end side of the lead terminal 9 into the conductive rubber 8.

There is a case where one end of the lead terminal 9 is directly soldered to a terminal electrode formed on the insulating substrate 2. In this case, the lead terminals 9 are attached to the terminal electrodes in advance, and when the soldered insulating substrate 2 of the lead terminals 9 is housed in the insulating case 1, the lead terminals 9 are simultaneously formed into the protrusions 6. It will be fitted in the lead terminal housing portion 7a.

The resin 4 on the opening side of the insulating case 1 is cast after the lead terminals 9 are arranged in the lead terminal housing 7 a of the groove 7 formed in the protrusion 6. This high-voltage variable resistor is provided with lead terminals other than the lead terminals 9 and lead wires as necessary, but they are not shown.

[0011]

[Problems to be solved by the device]

 In the high-voltage variable resistor configured as described above, the lead terminal 9 is reliably positioned by the protrusion 6. However, in order to arrange the lead terminal 9 in the lead terminal housing portion 7a of the groove 7 formed in the protrusion 6, it is necessary to apply a large force from above the lead terminal 9, and the work is not always easy. There was a problem that was hard to say.

Therefore, according to the present invention, the lead terminal is surely positioned on the protrusion, and the work for arranging the lead terminal in the lead terminal housing portion of the groove formed in the protrusion is facilitated. Intended to provide resistors.

[0013]

[Means for Solving the Problems]

 In order to achieve such an object, in the high-voltage variable resistor of the present invention, the lead terminal is disposed on the protrusion on the upper surface of the flange formed at one end on the opening side of the insulating case made of resin. A groove is formed, which includes a lead terminal housing portion, an opening communicating with the upper surface of the projection, and an elastic forming recess for giving elasticity to the projection. The opening communicating with the upper surface of the projection is arranged in the lead terminal housing portion. The lead terminal is formed in a shape that prevents the lead terminal from slipping out on the upper surface side of the protrusion, and the lead terminal is arranged and positioned in the lead terminal housing portion of the groove formed in the protrusion.

[0014]

[Action]

 Since the groove formed on the protrusion is provided with the elastic forming recess that gives elasticity to the protrusion, the protrusion can be easily pushed to both sides of the opening, and the lead terminal can be fitted into the lead terminal housing with less force than before. You can be crowded.

[0015]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional side view of a main 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, and FIG. 3 is an enlarged sectional view taken along the line AA of FIG. Is. In these figures, the same parts as those of the conventional example shown in FIGS. 9 to 11 are designated by the same reference numerals, and detailed description thereof will be omitted.

That is, the high-voltage variable resistor of the present invention is, like the conventional example, an insulating case 1 made of resin having an opening on one surface side, an insulating substrate 2 housed in the insulating case 1, The rotating shaft 3 is supported by the insulating case 1, and the resin 4 is cast into the opening of the insulating case 1.

Further, a collar 5 is integrally formed at one end on the opening side of the insulating case 1, and a protrusion 10 is integrally formed on the upper surface side of the collar 5. The protrusion 10 is provided with a groove 11 that communicates from the inner side to the outer side of the insulating case 1. The groove 11 includes a lead terminal housing portion 11a in which the lead terminal 9 is arranged, an opening 11b formed continuously with the lead terminal housing portion 11a and communicating with the upper surface of the protrusion 10, and a lead terminal housing portion 11a. It is composed of an elastic forming recess 11c which is continuous and is formed at a position opposite to the opening 11b to give elasticity to the protrusion 10.

The lead terminal housing portion 11a is formed to have substantially the same diameter as the lead terminal 9, and the lead terminal 9 is arranged and positioned in the lead terminal housing portion 11a. The opening 11b has a width dimension smaller than the diameter of the lead terminal 9 at a portion in contact with the lead terminal housing portion 11a, and has a width dimension slightly larger than the diameter of the lead terminal 9 on the upper surface side of the protrusion 10. The taper is formed so as to prevent the lead terminals 9 arranged in the lead terminal housing portion 11a from coming out to the upper surface side of the protrusion 10. That is, the opening 11b has a shape that prevents the lead terminal 9 from coming off. The elastic forming recess 11c is formed with a width dimension smaller than the diameter of the lead terminal 9, and imparts elasticity to the protrusion 10 so that the protrusion 10 can easily spread to both sides of the opening 11b. .

The method of arranging the lead terminal 9 in the lead terminal housing portion 11a of the groove 11 formed in the protrusion 10 is the same as in the conventional example. That is, as shown in FIG. 4, when the lead terminal 9 is placed on the upper surface side of the protrusion 10 along the opening 11b and a force is applied from above the lead terminal 9 in the direction of the arrow, the protrusion 10 is moved to the opening 11b. The lead terminals 9 are pushed out to both sides and fit into the lead terminal housing portion 11a. The force applied to the lead terminal 9 at this time is smaller than that in the conventional example because the protrusion 10 is easily spread to both sides of the opening 11b by the elastic forming recess 11c. The lead terminal 9 once fitted in the lead terminal housing portion 11a does not come out to the upper surface side of the projection 10 because the opening 11b has a retaining shape.

As described above, the work of arranging the lead terminal 9 in the lead terminal housing portion 11a of the groove 11 formed in the protrusion 10 is performed when one end of the lead terminal 9 is inserted into the conductive rubber 8 as in the conventional example. You can do both at the same time. When one end side of the lead terminal 9 is soldered to the terminal electrode of the insulating substrate 2, the lead terminal 9 is previously soldered to the terminal electrode, and the soldered insulating substrate 2 of the lead terminal 9 is insulated to the insulating case 1. It should be done at the same time when they are stored inside. The resin 4 on the opening side of the insulating case 1 is cast after the lead terminal 9 is placed in the lead terminal housing portion 11a of the groove 11 formed in the protrusion 11b. This resin 4 is not always essential.

In the above embodiment, the opening 11b of the groove 11 formed in the projection 10 has a shape in which the entire taper is provided. However, as shown in FIG. The protrusion 10 may have only chamfered corners on the upper surface side, or may have the same width dimension as a whole as shown in FIG.

Further, in the above-described embodiment, the protrusion 10 is formed on the upper surface side of the collar 5 which is entirely formed in the same plane. However, as shown in FIG. Alternatively, a part of the recess may be recessed and the recess may be formed. Even in this case, there is no difference in that the protrusion 10 is formed on the upper surface side of the collar 5.

Further, in the above-described embodiment, the elastic forming recess 11c of the groove 11 formed in the protrusion 10 is formed at a position opposite to the opening 11b with respect to the lead terminal accommodating portion 11a. However, the elastic forming recess 11c may be formed in a direction along the plane direction of the collar 5, as shown in FIG. In this case, in FIG. 8, the elastic-forming recesses 11c are formed on both sides of the lead terminal housing 11a, but only one of the left and right sides may be formed.

[0025]

[Effect of device]

 As described above, in the high-voltage variable resistor of the present invention, the projection for positioning the lead terminal is provided with the lead terminal housing portion in which the lead terminal is arranged and the opening communicating with the upper surface of the projection and the projection. A groove composed of a recess for elastic formation is formed, and its opening is formed in a shape that prevents the lead terminal arranged in the lead terminal accommodating section from coming out of the upper surface of the protrusion. Is reliably positioned on the protrusion, and the work of arranging the lead terminal in the lead terminal accommodating portion of the groove formed in the protrusion is facilitated.

[Brief description of drawings]

FIG. 1 is a cross-sectional side view of essential parts 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 taken along the line AA of the high voltage variable resistor shown in FIG.

FIG. 4 is an enlarged cross-sectional view at the same position as in FIG. 3 for explaining a method of disposing a lead terminal in a lead terminal accommodating portion of a groove formed in a protrusion.

5 is an enlarged cross-sectional view of the same position as FIG. 3 showing a modified example of the opening of the groove formed in the protrusion.

FIG. 6 is an enlarged cross-sectional view of the same position as in FIG. 3, showing another modification of the opening of the groove formed in the protrusion.

FIG. 7 is an enlarged cross-sectional view at the same position as in FIG. 3, showing a modified example of the collar having a protrusion.

FIG. 8 is an enlarged cross-sectional view of the same position as in FIG. 3 showing a modified example of the elastic forming recess of the groove formed in the protrusion.

FIG. 9 is a cross-sectional side view of a main part of a conventional high voltage variable resistor.

10 is a partial plan view of the high voltage variable resistor shown in FIG. 9. FIG.

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

FIG. 12 is an enlarged cross-sectional view at the same position as in FIG. 11 for explaining a method of disposing a lead terminal in a lead terminal housing portion of a groove formed in a protrusion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulation case 2 Insulation substrate 3 Rotating shaft 4 Resin 5 Collar 8 Conductive rubber 9 Lead terminal 10 Projection 11 Groove 11a Lead terminal housing 11b Opening 11c Recess for elastic formation

Claims (1)

[Scope of utility model registration request] 1. An opening of the insulating case, comprising: an insulating case made of a resin having an opening on one surface side; an insulating substrate housed in the insulating case; and a rotating shaft supported by the insulating case. A collar is integrally formed at one end on the side,
A high-voltage variable resistor in which a protrusion is integrally formed on the upper surface side of the collar, and a lead terminal led out from the insulating substrate to the opening side of the insulating case is positioned at the protrusion and pulled out to the outside of the insulating case. There is a groove formed on the protrusion, which includes a lead terminal accommodating portion in which the lead terminal is arranged, an opening communicating with an upper surface of the protrusion, and an elastic forming recess that gives elasticity to the protrusion. The opening communicating with the upper surface is formed in a shape that prevents the lead terminal arranged in the lead terminal receiving portion from slipping out to the upper surface side of the protrusion, and the lead terminal has a lead terminal receiving portion of a groove formed in the protrusion. A variable resistor for high voltage, which is arranged and positioned in the.