JPH0644105U - Variable resistor for high voltage - Google Patents

Abstract

(57) [Abstract] [Purpose] In a high-voltage variable resistor, the resin cast on the opening side of the insulating case reaches the protrusion on the upper surface of the collar formed at one end of the insulating case on the opening side, and there Even if it penetrates into the groove formed in, it does not flow out to the outside of the insulating case. [Structure] A protrusion 6 on the upper surface of a collar 5 formed at one end of the insulating case 1 on the opening side, and a groove 7 formed on the upper surface of the protrusion 6.
A notch 10 that divides is formed.

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, a structure having a structure as shown in FIGS. 5 to 7 has been proposed. 5 is a sectional side view of a main part of the high voltage variable resistor, FIG. 6 is a partial plan view of the high voltage variable resistor, and FIG. 7 is an enlarged sectional view taken along the line AA of FIG. That is, the high-voltage variable resistor shown in FIGS. 5 to 7 is composed of an insulating case 1 made of resin having an opening on one surface side and a ceramic such as alumina housed in the insulating case 1. It is composed of an insulating substrate 2, a rotating shaft 3 which is supported in the insulating case 1, and a resin 4 which is 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. A terminal electrode and the like connected to the are formed.

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

Further, one end is inserted into the conductive rubber 8 arranged inside the insulating case 1 in contact with the terminal electrode of the insulating substrate 2, and the other end is led out to the opening side of the insulating case 1. The terminal 9 is arranged and positioned in the groove 7 of the protrusion 6.

Note that one end of the lead terminal 9 may be directly soldered to the terminal electrode. Moreover, although this high voltage variable resistor is provided with an input terminal, an output lead wire, etc., they are not shown.

[0008]

[Problems to be solved by the device]

 However, in the high-voltage variable resistor configured as described above, as shown in FIG. 8, the resin 4 cast on the opening side of the insulating case 1 connects the inner wall surface of the insulating case 1 during casting. It may reach the position of the protrusion 6, further enter the groove 7 of the protrusion 6 and flow out to the outside of the insulating case 1. Such a phenomenon is more prominent when the portion of the lead terminal 9 buried in the resin 4 approaches the inner wall surface of the insulating case 1 because the surface tension between them becomes large.

As described above, when the resin 4 flows through the groove 7 of the protrusion 6 to the outside of the insulating case 1, when a high-voltage variable resistor is incorporated in a flyback transformer or the like and they are mounted on a printed circuit board. However, there is a problem that the lead terminal 9 cannot be inserted into the through hole of the printed board to a predetermined position, and as a result, the flyback transformer or the like is mounted in an inclined state.

Therefore, in the present invention, the resin cast into the opening side of the insulating case is prevented from flowing out to the outside of the insulating case even when reaching the protrusion for positioning the lead terminal. It is intended to provide a variable resistor for high voltage.

[0011]

[Means for Solving the Problems]

 In order to achieve such an object, in the high-voltage variable resistor according to claim 1 of the present invention, the groove formed in the protrusion on the upper surface of the collar formed at one end on the opening side of the insulating case. It is characterized in that a notch that divides is formed.

Further, in the high-voltage variable resistor according to claim 2 of the present invention, a protrusion on the upper surface of the collar formed at one end on the opening side of the insulating case is provided with a concave portion in contact with the groove formed therein. It is characterized by being formed.

[0013]

[Action]

 In claim 1, since the notch that divides the groove formed therein is formed in the protrusion on the upper surface of the collar, the resin cast into the opening side of the insulating case reaches the protrusion and is formed there. Even if it enters the groove, the resin will be stored in the notch and will not flow out to the outside of the insulating case.

Further, in claim 2, since the recess on the upper surface of the collar is in contact with the groove formed therein, the resin cast on the opening side of the insulating case reaches the projection and reaches there. Even if the resin enters the formed groove, the resin is stored in the recessed portion and does not flow out to the outside of the insulating case.

[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, and FIG. 2 is a partial plan view of the high voltage variable resistor. In these figures, the same parts as those of the conventional example shown in FIGS. 5 and 6 are designated by the same reference numerals, and detailed description thereof will be omitted.

That is, in the high voltage variable resistor of the present invention, as in the conventional example, the insulating case 1 having an opening on one surface side, the insulating substrate 2 housed in the insulating case 1, and the insulating case. It is composed of a rotating shaft 3 which is supported by 1 and a resin 4 which is cast on the opening side of the insulating case 1.

A flange 5 is formed at one end of the insulating case 1 on the opening side, and a projection 6 is formed on the upper surface of the flange 5. A groove 7 similar to that of the conventional example is formed on the protrusion 6. A notch 10 that divides the groove 7 is formed in the middle of the protrusion 6. The notch 10 in this embodiment is formed so as to completely divide the protrusion 6, but if the groove 7 is divided, the purpose can be achieved, so that the notch 10 of the protrusion 6 is larger than the flange 7. A notch having a depth such that the projection 6 is connected may be formed on the portion on the 5 side.

In the high-voltage variable resistor configured as described above, even if the resin 4 reaches the protrusions 6 and enters the groove 7 during casting, the resin remains in the notch 10. It

3 and 4 show another embodiment of the present invention. FIG. 3 is a partial plan view of a high voltage variable resistor, and FIG. 4 is an enlarged sectional view taken along the line AA of FIG. . In this embodiment, instead of the notch 10 of the previous embodiment, a recess 11 that is in contact with the groove 7 is formed in the center of the upper surface of the protrusion 6 formed on the upper surface of the collar 5.

Also in the high-voltage variable resistor configured as described above, the resin that has entered the groove 7 is collected in the concave portion 11 and does not easily flow out to the outside of the insulating case 1.

[0022]

[Effect of device]

 As described above, according to claim 1 of the present invention, since the notch that divides the groove formed therein is formed in the protrusion on the upper surface of the collar formed at the opening-side end of the insulating case, The resin that has entered the groove will be collected in the cutout portion, and will not flow out to the outside of the insulating case.

According to the second aspect of the present invention, the protrusion on the upper surface of the collar formed at the one end on the opening side of the insulating case is formed with the concave portion in contact with the groove formed therein. The resin that has entered the inside will stay in the recessed portion, and will not flow out to the outside of the insulating case.

[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 a partial plan view of a high voltage variable resistor according to another embodiment of the present invention.

FIG. 4 is an enlarged cross-sectional view taken along the line AA of the high voltage variable resistor shown in FIG.

FIG. 5 is a cross-sectional side view of a main part of a conventional high voltage variable resistor.

6 is a partial plan view of the high voltage variable resistor shown in FIG. 5. FIG.

7 is an enlarged sectional view of the high voltage variable resistor shown in FIG. 6 taken along the line AA.

FIG. 8 is a partial cross-sectional side view of a high-voltage variable resistor for explaining the problems of the conventional example.

[Explanation of symbols]

 1 Insulating Case 2 Insulating Substrate 3 Rotating Shaft 4 Resin 5 Tsuba 6 Protrusion 7 Groove 10 Notch 11 Recess

Claims (2)

[Scope of utility model registration request] 1. An insulating case having an opening on one surface side,
A high-voltage variable resistor comprising an insulating substrate housed in the insulating case, a rotary shaft bearing in the insulating case, and a resin cast on the opening side of the insulating case, A flange is formed at one end on the opening side of the insulating case, a protrusion is formed on the upper surface of the flange, and a groove is formed in the protrusion, and the lead terminal led out from the insulating substrate to the insulating case opening side is It is placed and positioned in the groove of the protrusion,
A variable resistor for high voltage, wherein the protrusion is formed with a notch that divides the groove. 2. An insulating case having an opening on one surface side,
A high-voltage variable resistor comprising an insulating substrate housed in the insulating case, a rotary shaft bearing in the insulating case, and a resin cast on the opening side of the insulating case, A flange is formed at one end on the opening side of the insulating case, a protrusion is formed on the upper surface of the flange, a groove is formed on the upper surface of the protrusion, and a lead terminal led out from the insulating substrate to the opening side of the insulating case is formed. A variable resistor for high voltage, wherein the variable resistor for high voltage is arranged and positioned in a groove of the protrusion, and the protrusion is formed with a recess in contact with the groove formed therein.