JPH0653001A - Terminal fixing structure for electronic component and variable resistor for high voltage - Google Patents

Abstract

PURPOSE:To enable fixing electronic components easily without using thermal fusion-bonding, by inserting both peripheral parts of the fixing part of a metal terminal in the insertion direction along a pair of guide grooves formed at a pair of standing parts for fixing a terminal, and making an engaging segment formed at both of the peripheral parts engage with a part to be engaged which is formed in a pair of the guide groove. CONSTITUTION:When a metal terminal 7 is inserted into a guide groove 12b so as to make a connection part 73 be a top, the terminal is smoothly inserted until an engaging segment 72 is inserted into the guide groove 12b. When an engaging segment 72c enters the guide groove 12b, the engaging segment 72c proceeds while extending a pair of standing parts 12a, 12a for fixing a terminal. When the engaging segment 72c engages with a slit 12c, a pair of the standing parts 12a, 12a which are extended return to the initial state, and an engaging part 72c2 of the engaging segment 72c engages with a division surface 12d, thereby preventing the metal terminal 7 from coming out. Hence the metal terminal can be easily fixed to a terminal fixing part, finish is excellent after the metal terminal is fixed, and yield is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic component terminal mounting structure for mounting metal terminals to a terminal mounting portion of an insulating resin case of an electronic component such as a high voltage variable resistor, and a high voltage applying structure to which the mounting structure is applied. It relates to a variable resistor.

[0002]

7A and 7B illustrate a conventional mounting structure for mounting a metal terminal 103 to a terminal mounting portion 102 of an insulating resin case 101 of an electronic component such as a high voltage variable resistor. FIG. Insulating resin case 10
On one side portion 101a of the opening end portion of one, three terminal portions 102a to 102c for welding are provided at predetermined intervals so as to form a terminal mounting portion 102. Metal terminal 103
Has integrally a terminal portion 103a, a fixing portion 103b fixed to the terminal mounting portion 102, and a connecting portion 103c to which a connecting wire is connected. The fixing portion 103b is formed with a through hole 103d into which the welding upright portion 102b is inserted. Conventionally, after arranging the terminal metal fittings 103 as shown in FIG. 7 (B), all of the welding upright portions 102a to 102c are melted by heat welding to weld the welded portion 1 as shown in FIG. 7 (A).
04 is formed to fix the metal terminal 103 to the terminal mounting portion 102. In the conventional high-voltage variable resistor, even if there are a plurality of metal terminals, the metal terminals are attached using the thermal welding technique in the same manner as above.

[0003]

When the metal terminal is fixed by using the heat welding technique as in the prior art, the work for positioning the metal terminal and the heat welding are required, so that the number of work steps is increased and the production is increased. I didn't like it. In particular, the heat-welding work has a problem that the yield tends to be poor because the failure tends to occur, and the appearance of the welded portion after welding is poor, resulting in a decrease in the commercial value. These problems become more serious as the number of metal terminals attached to one electronic component increases.

An object of the present invention is to provide a terminal mounting structure for an electronic component, which can easily mount a metal terminal without using heat welding. Another object of the present invention is to provide a terminal mounting structure for an electronic component, in which the metal terminal can be easily mounted and the metal terminal does not come off from the terminal mounting portion. Still another object of the present invention is to provide a terminal mounting structure for electronic parts, which is capable of mechanically mounting metal terminals. Another object of the present invention is to provide a high voltage variable resistor which can be easily attached to most metal terminals without using heat welding. Still another object of the present invention is to provide a high voltage variable resistor in which the metal terminals are not detached from the terminal mounting portion even when the terminal portions of the plurality of metal terminals are inserted into the female terminals.

[0005]

According to a first aspect of the present invention, there is provided a connection for connecting a terminal portion, a fixing portion fixed to the terminal mounting portion, and a connecting wire to a terminal mounting portion of an insulating resin case of an electronic component. An object of the present invention is to improve an attachment structure of a terminal for an electronic component, which is formed by attaching a metal terminal integrally having a portion. The terminal mounting portion used in the invention of claim 1 has a pair of flexible terminal mounting upright portions fixed to an insulating resin case at a predetermined interval from each other. A pair of guide grooves extending from one end to the other end of the terminal mounting upright portion and opening inward are provided on inner wall portions of the upright standing portion facing each other. A locked portion is provided in the middle of the pair of guide grooves. Further, both widthwise edges of the fixed portion of the metal terminal are formed into a shape that can be inserted into the pair of guide grooves, and a pair of locking pieces are provided at both edges. The pair of locking pieces of the metal terminal and the pair of locked portions of the guide groove are engaged with each other to prevent the metal terminal from coming off.

According to the second aspect of the present invention, the slanted portion and the slanted portion are formed such that the width of the locking piece widens in the direction opposite to the insertion direction of the metal terminal to push the gap between the pair of terminal mounting upright portions. And an engaging portion extending inward in the width direction from the end portion of the. Further, the locked portion provided in each of the pair of guide grooves includes a fitting portion into which the pair of locking pieces fit, and an engaging surface that engages with the locking portion of the locking piece.

According to the third aspect of the present invention, the upper end portion of the pair of terminal mounting upright portions above the guide groove is divided by the slit extending in the direction orthogonal to the extending direction of the guide groove. The slit constitutes a fitting portion into which the locking piece fits, and the divided surfaces formed in the terminal-mounting upright portions facing each other with the slit interposed therebetween constitute an engagement surface.

According to another aspect of the present invention, a pair of stopper pieces are provided at the ends (ends in the direction opposite to the insertion direction) of the fixed portion of the metal terminal, and the ends of the pair of terminal mounting upright portions (the insertion direction). A pair of abutting portions that abut the pair of stopper pieces are provided at the end portions in the opposite direction).

The fifth and sixth aspects of the invention are directed to a high voltage variable resistor to which the mounting structure of the first to fourth aspects of the invention is applied. Specifically, an insulating substrate having a resistor circuit including a variable resistor formed on the surface is arranged inside an insulating resin case having an opening at one end, and a predetermined side is provided on one side of the opening end of the insulating resin case. A plurality of metal terminals having a plurality of terminal mounting portions integrally provided with the insulating resin case at intervals and integrally having a terminal portion, a fixing portion fixed to the terminal mounting portion, and a connecting portion to which a connecting wire is connected. A high-voltage variable resistor in which a terminal is attached to each of a plurality of corresponding terminal attachment portions is an object of improvement. According to the invention of claim 5, the terminal mounting portions to which other metal terminals of the plurality of metal terminals except the metal terminals directly connected to the electrodes provided on the insulating substrate are mounted are insulated from each other at a predetermined interval. It is composed of a pair of flexible terminal mounting uprights fixed to a resin case, and the pair of terminal mounting uprights are provided on opposite inner side wall parts from one end to the other end of the terminal mounting uprights. A pair of guide grooves extending toward the inside and opening toward the inside is formed. A locked portion is provided in the middle of the pair of guide grooves. Further, both widthwise edges of the fixed portion of the metal terminal are shaped so that they can be inserted into the pair of guide grooves, and a pair of locking pieces are provided at both edges. Then, the pair of locking pieces of the metal terminal and the locked portion of the guide groove are engaged with each other to prevent the metal terminal from coming off.

According to the sixth aspect of the present invention, the terminal portions of the plurality of metal terminals are extended toward the outside of the insulating resin case so that the terminal portions can be inserted into the female terminals provided on the attached portion. Further, the other metal terminal is attached to the terminal mounting portion such that the insertion direction of the other metal terminal into the guide groove is opposite to the insertion direction of the plurality of metal terminals into the female terminal.

[0011]

According to the terminal mounting structure of the present invention, both edge portions of the fixed portion of the metal terminal are inserted in the insertion direction along the pair of guide grooves provided in the pair of terminal mounting upright portions, and both edge portions are inserted. The engaging piece provided in the above is engaged with the engaged portion provided in the pair of guide grooves. When the locking piece and the locked portion are engaged with each other, even if a force is applied to the metal terminal in the direction opposite to the insertion direction (drawing direction), the metal terminal does not come out of the guide groove. Therefore, according to the present invention, it is possible to easily attach the metal terminal to the terminal attachment portion by using only a simple operation of inserting the metal terminal into the guide groove without using a heat welding technique. Further, since the heat welding technique is not used, the yield is high and the finish after mounting the metal terminals can be made good.

In the terminal mounting structure according to the second aspect of the present invention, when both edges of the fixed portion of the metal terminal are inserted into the pair of guide grooves, first, the inclined portions of the locking pieces provided in the fixed portion of the metal terminal are paired. The metal terminal enters the guide groove while expanding the space between the terminal mounting upright portions. Then, when the metal terminal is further inserted and the locking piece is fitted into the fitting portion provided in the guide groove, the space between the pair of terminal mounting upright portions is substantially returned to the original state, and the locking piece is The locking portion of the engaging portion engages with the engaging surface of the fitting portion to prevent it from coming off. Since the inclined portion of the locking piece is inclined in a direction that does not hinder the entrance of the locking piece, it is easy to insert the metal terminal into the guide groove. However, when attempting to pull out the metal terminal from the guide groove, a large pulling force is required to release the engagement between the engaging part of the engaging piece and the engaging surface of the engaged part, and The metal terminal must be pulled out with the corner formed at the boundary between the inclined part and the locking part of the piece hooked on the wall surface of the guide groove, and if a considerable pulling force is not applied, pull out the metal terminal I can't. Therefore, according to the present invention, it is possible to more reliably prevent the metal terminal from coming off.

In the terminal mounting structure according to the third aspect of the present invention, only the slits are formed in the upper end portions of the pair of upright portions for terminal mounting which are located above the pair of guide grooves, and the locked portions are provided in the guide grooves. The fitting portion and the engaging surface of can be easily formed.

In the terminal mounting structure of the invention of claim 4, the stopper piece provided on the fixed portion of the metal terminal comes into contact with the abutting portion provided on the terminal mounting upright portion, and the stopper piece is inserted more than necessary in the inserting direction of the metal terminal. Prevent movement. Therefore, according to the present invention, the positioning accuracy of the metal terminal is improved.

In the variable resistor for high voltage according to the fifth aspect, even if there are many metal terminals to be attached to the terminal attaching portion, each metal terminal can be attached easily and surely, so that the productivity is greatly improved.

In the high-voltage variable resistor according to claim 6, the force applied to the metal terminals when inserting the plurality of metal terminals into the female terminals is applied in the direction of inserting the metal terminals into the guide groove. The metal terminal does not come off.

[0017]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 shows a bottom view of a high-voltage variable resistor adopting the terminal mounting structure of the present invention for mounting a metal terminal. In FIG. 1, reference numeral 1 denotes an insulating resin case having an opening at one end formed of an insulating resin material such as polybutylene terephthalate. This case 1 has a first opening that opens to the back side.
Has a substrate storage chamber 1a and a second substrate storage chamber 1b, and three variable resistors for double focus voltage adjustment and screen voltage adjustment are provided on the front side of the first substrate storage chamber 1a. An operation shaft through hole through which the operation shaft is projected is formed. A first circuit board made of ceramics, on the surface of which a variable resistor, a fixed resistor and an electrode are printed and formed, is housed in the first board housing chamber 1a with its back surface facing the opening side. An insulating resin layer 2 is formed by filling and curing an insulating resin such as an epoxy resin in the opening of the first substrate housing chamber 1a so as to cover the back surface of the first circuit board. Second
A second circuit board (not shown) on which a fixed resistor that generates a large amount of heat is printed is placed in the board housing chamber 1b in a standing state with its board surface facing the first board housing chamber 1a. It

The screen output terminal 3, the focus output terminals 4 and 5 and the connection terminal 6 project from the insulating resin layer 2. On one side portion 1c of the opening end of the case 1, metal terminals 7 to 11 are fixed along a side with a predetermined interval. Of these metal terminals, the metal terminals 7 to 10 are attached to terminal attachment portions 12 to 15 integrally provided on the one side portion 1c of the case 1. The metal terminal 11 is a ground terminal, one end of which is soldered to an electrode provided on the back surface of the first circuit board (not shown) and embedded in the insulating resin layer 2, and the other end of which is shown in FIG. Similar to the conventional terminal mounting structure shown, it is fixed to the terminal mounting portion by thermal welding. Reference numeral 16 indicates a terminal mounting portion which is deformed by heat welding.

Metal terminals 7 to 10 and terminal mounting portions 12 to 1
Since the structures of 5 are substantially the same, these structures will be described below with the metal terminal 7 and the terminal mounting portion 12 as representative examples. FIG. 2A shows the metal terminal 7 with the terminal mounting portion 12
FIG. 2B is an enlarged plan view of a state in which it is attached to FIG. 3 (A) is an enlarged front view of the terminal mounting portion 12, FIG. 3 (B) is a sectional view taken along the line BB of FIG. 3 (A), and FIG. 4 (A) is an enlarged plan view of the terminal fitting 7. FIG. 4 and FIG.
4B is an enlarged side view of the terminal fitting 7, and FIG. 4C is a sectional view taken along line CC of FIG. 4B. First of all,
The configuration of the terminal fitting 7 will be described using. The terminal fitting 7 is configured to integrally include a terminal portion 71, a fixing portion 72 fixed to the terminal mounting portion 12, and a connecting portion 73 to which a connecting wire is connected. A reinforcing punched-out portion 74 is formed so as to extend in the longitudinal direction across the terminal portion 71 and the fixed portion 72. The width of the fixed portion 72 is larger than that of the terminal portion 71. A pair of stopper pieces 72a, 72a are provided at both ends of the base of the terminal portion 71 at the end of the fixed portion 72 on the terminal portion 71 side (pull-out side). Stopper piece 72a,
72a extends in one direction in the thickness direction (direction toward the case 1). Both edges 72 in the width direction of the fixed portion 72
A pair of locking pieces 72c, 72c are integrally formed on the b, 72b. The locking pieces 72c, 72c of this embodiment are
It has a triangular shape that protrudes outward in the width direction from both edge portions 72b, 72b. Specifically, in FIG. 4, the width of the inclined portion 72c1 and the widthwise direction from the end of the inclined portion 72c1 that widen in the direction opposite to the insertion direction of the metal terminal indicated by the solid arrow (the drawing direction indicated by the dashed arrow). A locking piece 72 is composed of a locking portion 72c2 extending inward. The locking piece 72c includes a pair of terminal mounting upright portions 12a, 1 described later.
It has a projecting dimension that expands the gap between the pair of terminal mounting upright portions when inserted into the guide grooves 12b, 12b of 2a. In the portion in the insertion direction from the locking piece 72c,
A pair of recesses 72d, 72d extending inward in the width direction
Are formed. An end portion of the fixing portion 72 on the insertion side is cut and raised to form a connecting portion 73. Since the end portions 72e, 72e of the fixing portion 72 located on both sides of the connecting portion 73 are tapered, they can be easily inserted into the guide groove described later. After a connecting wire such as a lead wire is wound around the connecting portion 73, soldering is performed. The metal terminals 7 and 8 shown in FIG. 1 are connected to a resistance pattern of a second circuit board (not shown) via lead wires, and
Starts a lead wire and is connected to the screen output terminal 3, and the metal terminal 10 is connected to one focus output terminal 4 through the lead wire.

Next, the structure of the terminal mounting portion 12 will be described. As shown in FIGS. 2 and 3, the terminal mounting portion 12 has a pair of flexible terminal mounting upright portions 12 a, 12 a integrally provided on one side portion 1 c of the case 1. In this embodiment, a pair of terminal mounting uprights 12a, 1
The base portions of 2a are continuous with each other as shown in the drawing, but it goes without saying that the mounting upright portions 12a, 12a may directly extend from the one side portion 1c of the case 1. A pair of guides extending from one end to the other end (toward the insertion direction) of the pair of terminal mounting upright portions 12a, 12a facing each other on the inner side wall portions and opening inward. Grooves 12b, 12b are formed. Further, upper end portions of the pair of terminal mounting upright portions 12a, 12a above the guide grooves 12b, 12b are divided by a slit 12c extending in a direction orthogonal to a direction in which the guide groove 12b extends. The slit 12c forms a locked portion that engages with the engaging piece 72c of the metal terminal 7 in the middle of the guide groove 12b. That is, the slit 12c constitutes a fitting portion with which the locking piece 72c is fitted, and as shown in FIG. 2A, the locking piece 72c is fitted with the slit 12c.
The engaging portion 72c2 of the engaging piece 72c engages with a divided surface 12d located on the opposite side of the insertion direction of the metal terminal 7 among the divided surfaces formed on both sides of the slit 12c. The divided surface 12d constitutes an engaging surface that engages with the engaging portion 72c2. Also, a pair of terminal mounting uprights 12a,
12a end (end opposite to metal terminal insertion direction)
Includes a pair of stopper pieces 72a, 7a provided on the metal terminal 7.
A pair of contact portions 12e and 12e that contact the 2a are provided (see FIG. 3). The contact portion 12e of this embodiment has a recessed shape whose depth is substantially equal to the thickness of the stopper piece 72a.

When the metal terminal 7 is inserted into the guide groove 12b with the connecting portion 73 first, the locking piece 72 is inserted into the guide groove 12b.
The metal terminal 7 can be smoothly inserted into the guide groove 12 until it is inserted into. When the locking piece 72c enters into the guide groove 12b, the locking piece 72c forms a pair of the terminal mounting upright portions 1.
Push 2a and 12a to the wide end. Inclined part 72c1
Is inclined in a direction that does not hinder the entrance of the locking piece 72c, it is relatively easy to insert the metal terminal 7 into the guide groove. When the locking piece 72c fits into the slit 12c, the pair of terminal mounting upright portions 12a, which are pushed apart,
12a returns to its original state, and the engaging portion 72c2 of the engaging piece 72c is engaged with the dividing surface 12d, so that the metal terminal 7 is prevented from coming off. When the metal terminal 7 is to be pulled out from the guide groove 12b, a large pulling force is required to release the engagement between the engaging portion 72c2 of the engaging piece 72c and the dividing surface (engaging surface) 12d. , The inclined portion 7 of the locking piece 72c
The metal terminal 7 must be extracted with the corner formed at the boundary between the 2c1 and the locking portion 72c2 being caught by the wall surface of the guide groove 12b. I can't pull it out. Since the stopper piece 72a contacts the contact portion 12e, the metal terminal 7 cannot be inserted further into the back.

In the high voltage variable resistor of the embodiment of FIG. 1, the force applied to each metal terminal when inserting the metal terminals 7 to 10 into a female terminal (not shown) inserts each metal terminal into the guide groove 12b. Since the metal terminals 7 to 10 are added in the direction, the metal terminals 7 to 10 do not come off at this time. Therefore, even when the terminals of the high-voltage variable resistor are connected to the female terminals provided on the flyback transformer side by the connector structure, the terminals can be connected without any trouble.

In the above embodiment, the slit 12c is provided substantially in the center of the terminal mounting upright portion 12a, and the engaged portion is formed in the middle of the guide groove 12b by the slit 12c. The present invention is not limited to this embodiment, and as shown in the schematic perspective view of FIG. 5, for example, the slit 12c may be provided at a position displaced from the central portion of the terminal mounting upright portion 12a. Further, in the above embodiment, the engaged portion is formed by providing the slit 12a, but as shown in FIG. 6 (A), the terminal attaching upright portion 1 is formed.
Opening recess 1 that opens inward and upward in the middle of 2a
By forming 2f, a fitting portion for fitting the locking piece 72c and a locking surface for engaging with the locking portion 72c2 of the locking piece 72c may be formed. Further, as shown in FIG. 6B, a step 12g is provided in the middle of the guide groove 12b so that the locking piece 7 of the metal terminal 7 is provided in the middle of the guide groove 12b.
You may make it the locked part which engages with 2c.
Further, as shown in FIG. 6C, a protrusion 12h is provided in the middle of the guide groove 12b to form a locked portion that is engaged with the locking piece 72c of the metal terminal 7 in the middle of the guide groove 12b. You may As described above, the structure of the locked portion provided in the middle of the guide groove 12b may be any structure as long as it can be engaged with the locking piece of the metal terminal to prevent the metal terminal from coming off. May be.

Further, in the above embodiment, one locking piece is provided on each of both edges of the fixed portion of the metal terminal, but a plurality of locking pieces may be provided on one edge. Of course, in that case, the number of locked portions provided in the guide groove may be equal to the number of locking pieces. Further, in the above-mentioned embodiment, the shape of the locking piece is triangular, but the shape of the locking piece is not limited to the above-mentioned embodiment, and the metal terminal can be easily inserted and can be engaged with the locked portion. Any shape may be used as long as it is difficult to pull out the metal terminal after the connection.

In the above embodiment, the terminal mounting structure of the present invention is applied to the high-voltage variable resistor, but the terminal mounting structure of the present invention can be applied to the mounting of terminals of other electronic parts. Is.

[0026]

According to the first aspect of the present invention, the metal terminal can be easily attached to the terminal attaching portion without using the heat welding technique by only the simple work of inserting the metal terminal into the guide groove. . Further, since the heat welding technique is not used, there is an advantage that the yield is high and the finish after mounting the metal terminals can be good.

According to the second aspect of the present invention, the metal terminal can be more reliably prevented from coming off.

According to the invention of claim 3, the slits are formed in the upper end portions of the pair of upright portions for terminal attachment which are located above the pair of guide grooves. There is an advantage that the joint portion and the engagement surface can be easily formed.

According to the fourth aspect of the present invention, the stopper piece provided on the fixed portion of the metal terminal abuts on the abutment portion provided on the terminal mounting upright portion to prevent unnecessary movement of the metal terminal in the inserting direction. Therefore, the positioning accuracy of the metal terminal can be improved.

According to the high voltage variable resistor of the fifth aspect of the present invention, even if there are many metal terminals to be attached to the terminal attaching portion, each metal terminal can be attached easily and surely, so that the productivity is greatly improved. There is an advantage to improve.

According to the high voltage variable resistor of the sixth aspect, the force applied to the metal terminals when inserting the plurality of metal terminals into the female terminals is applied in the direction of inserting the metal terminals into the guide groove. Therefore, there is an advantage that the metal terminal does not come off.

[Brief description of drawings]

FIG. 1 shows a bottom view of a high-voltage variable resistor adopting the terminal mounting structure of the present invention for mounting a metal terminal.

FIG. 2A is an enlarged plan view showing a state in which a metal terminal is attached to a terminal attachment portion, and FIG. 2B is a front view thereof.

FIG. 3A is an enlarged front view of a terminal mounting portion,
FIG. 3B is a sectional view taken along line BB of FIG.

FIG. 4A is an enlarged plan view of the terminal fitting, and FIG.
4C is an enlarged side view of the terminal fitting, and FIG. 4C is a sectional view taken along line CC of FIG. 4B.

FIG. 5 is a perspective view showing a modified example of the terminal mounting structure of the present invention.

6A to 6C are views showing modified examples of the configuration of the locked portion provided in the guide groove.

FIG. 7 (A) is a partial perspective view showing a conventional terminal mounting structure, and FIG. 7 (B) is a sectional view for explaining a state before heat welding.

[Explanation of symbols]

 1 Case 2 Insulating resin layer 3-6 Terminal 7-11 Metal terminal 12-15 Terminal mounting part 12a Terminal mounting upright part 12b Guide groove 12c Slit 12d Dividing surface 71 Terminal part 72 Fixing part 72c Locking piece 72c1 Inclined part 72c2 Engagement Stop 73 Connection

Claims (6)

[Claims] 1. A metal terminal integrally having a terminal portion, a fixing portion fixed to the terminal mounting portion, and a connecting portion to which a connecting wire is connected is attached to the terminal mounting portion of an insulating resin case of an electronic component. In the electronic component terminal mounting structure, the terminal mounting portion has a pair of flexible terminal mounting upright portions fixed to the insulating resin case at a predetermined interval from each other, and A pair of guide grooves extending from one end to the other end of the terminal mounting upright portion and opening inward are provided on inner wall portions of the pair of terminal mounting upright portions facing each other, Engagement portions are provided in the middle, and both edge portions in the width direction of the fixing portion of the metal terminal are formed in a shape that can be inserted into the pair of guide grooves. A pair of locking pieces is provided, and the pair of the metal terminals A terminal mounting structure for an electronic component, wherein a locking piece is engaged with the locked portion of the pair of guide grooves to prevent the metal terminal from coming off. 2. The slanted portion, the width of which extends in the direction opposite to the insertion direction of the metal terminal, and the spacing between the pair of upright portions for terminal mounting is expanded, and the end of the slanted portion. A locking portion extending inward in the width direction from the portion, and the locked portion provided in each of the pair of guide grooves includes a fitting portion into which the pair of locking pieces fits together with the locking piece. The electronic component terminal mounting structure according to claim 1, further comprising: an engagement surface that engages with the locking portion. 3. An upper end portion of the pair of terminal mounting upright portions above the guide groove is divided by a slit extending in a direction orthogonal to a direction in which the guide groove extends, and the slit is the locking. The split surface which comprises the fitting part which a piece fits is comprised, and the terminal mounting upright part which opposes via the said slit has comprised the said engaging surface. Terminal mounting structure for electronic components. 4. A pair of stopper pieces is provided at an end of the metal terminal opposite to the inserting direction of the fixing portion, and a pair of stopper pieces is provided at the opposite end of the pair of terminal mounting uprights. The terminal mounting structure for an electronic component according to claim 1, 2 or 3, wherein a pair of contact portions that contact the pair of stopper pieces are provided. 5. An insulating substrate having a resistor circuit including a variable resistor formed on its surface is disposed inside an insulating resin case having an opening at one end, and a predetermined portion is provided on one side of the opening end of the insulating resin case. A plurality of terminal mounting portions are provided integrally with the insulating resin case at intervals, and the terminal portion, a fixing portion fixed to the terminal mounting portion, and a connecting portion to which a connecting wire is connected are integrally formed. Is a high-voltage variable resistor each of which is attached to the corresponding plurality of terminal mounting portions, wherein a metal terminal directly connected to an electrode provided on the insulating substrate among the plurality of metal terminals is Except for the other metal terminals, the terminal mounting portion has a pair of flexible terminal mounting upright portions fixed to the insulating resin case at a predetermined interval from each other, Opposite standing part for terminal mounting The inner wall portion has a pair of guide grooves extending from one end to the other end of the terminal mounting upright portion and opening inward, and each of the pair of guide grooves is locked in the middle thereof. A portion is provided, both widthwise edges of the fixing portion of the other metal terminal are formed in a shape that can be inserted into the pair of guide grooves, and a pair of locking pieces are provided at the both edges. A variable resistor for high voltage, characterized in that the pair of locking pieces of the metal terminal and the locked portions of the pair of guide grooves are engaged with each other to prevent the metal terminal from coming off. . 6. The terminal portions of the plurality of metal terminals extend outward from the insulating resin case so that they can be inserted into the female terminals provided in the attached portion, and the terminal portions of the other metal terminals are provided. The high voltage according to claim 5, wherein the other metal terminal is attached to the terminal mounting portion such that the insertion direction into the guide groove is opposite to the insertion direction into the female terminal of the plurality of metal terminals. Variable resistor for.