JPH0650305U - Variable resistor for high voltage - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a high-voltage variable resistor to which lead wires can be connected at the end of assembly and which can be easily and reliably connected to a flyback transformer. [Structure] Between an insulating case 1 and a circuit board 5, a lead wire holding means 4 electrically connected to an output electrode of a resistor circuit pattern on the circuit board is arranged. The core of the output lead wire is held by the lead wire holding means 4. The connecting terminal portion 7 formed by inserting the conductive rubber 7c into the tubular portion 7b is projected from the insulating resin layer 6. In the tubular portion 7b of the connecting terminal portion 7,
A cutout portion is provided which extends in the axial direction of the tubular portion and into which a connecting line extending from the flyback transformer side is inserted.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a high voltage variable resistor used in combination with a flyback transformer.

[0002]

[Prior art]

 The high-voltage variable resistor combined with the TV flyback transformer has a circuit board with a resistor circuit pattern including a focusing resistor and a screen resistor on the surface and is housed inside an insulating case with an open end. The structure has a structure in which an insulating resin is filled in the opening of the insulating case and an insulating resin layer is formed on the back surface side of the circuit board. The back side of the circuit board of the high-voltage variable resistor is provided with a connection terminal for connection with the flyback transformer and a connection terminal for grounding. When combining a high-voltage variable resistor with a flyback transformer, first insert the high-voltage variable resistor into the mounting window provided in the flyback transformer case. After making electrical connection between the flyback transformer and the high voltage variable resistor, the flyback transformer case is filled with mold resin to integrate the flyback transformer and the high voltage variable resistor. To be done. It has been proposed to use conductive rubber to facilitate electrical connection between the flyback transformer and the high-voltage variable resistor [Japanese Patent Publication No. 60-18904].

[0003]

[Problems to be solved by the device]

 Even if a conductive rubber is used to facilitate the connection with the flyback transformer, in the conventional high-voltage variable resistor, after connecting the lead wire to the circuit board in advance, the insulating resin is placed in the opening of the insulating case. Is filled and cured. As a result, the lead wire was an obstacle when filling the resin and when inserting the assembly into the thermostatic chamber to cure the filled insulating resin, which was an obstacle to mass production. In addition, even when combined with a flyback transformer, the lead wire becomes an obstacle, and if the lead wire is present when the mold resin of the flyback transformer is cured in the constant temperature tank, the space in the constant temperature tank may not be effectively used. . In addition, since the lead wires are connected by soldering in advance, it is necessary to make separate high-voltage variable resistors with different lead wire lengths depending on the model, which is not versatile. there were.

Further, the electrical connection between the conventional flyback transformer using a conductive rubber and the high-voltage variable resistor disclosed in Japanese Patent Laid-Open No. 60-18904 is carried out by electrically conducting the case of the flyback transformer. The conductive rubber was fixed, and the connection terminal was inserted from the end of the conductive rubber in the axial direction to the back side of the circuit board of the high-voltage variable resistor. In this configuration, since the conductive rubber is fixed to the case side of the flyback transformer, the resin for molding the flyback transformer is not filled between the case of the flyback transformer and the high-voltage variable resistor. Therefore, there was a problem with the dielectric strength.

An object of the present invention is to provide a high-voltage variable resistor which can be connected with lead wires at the end of assembly and can be easily and reliably connected with a flyback transformer.

[0006]

[Means for Solving the Problems]

 The high-voltage variable resistor of the present invention is a high-voltage variable resistor used in combination with a flyback transformer, and has a variable resistance on the surface as seen in the embodiments shown in FIGS. 1 to 7. A circuit board 5 having a resistor circuit pattern including a body is housed inside an open-ended insulating case 1, and a slider is housed between the insulating case 1 and the surface of the circuit board 5. A lead wire in which the opening 1 is filled with an insulating resin to form an insulating resin layer 6 on the back surface side of the circuit board, and a side wall (1c, 1i) of the insulating case 1 is inserted with an output lead wire. Insertion holes (3b, 3c) are formed, and the connecting terminal portion 7 in which the conductive rubber 7c is fitted in the tubular portion 7b projects from the insulating resin layer 6. Between the insulating case 1 and the circuit board 5, the lead wire holding means 4 electrically connected to the output electrode of the resistor circuit pattern on the circuit board is arranged. The lead wire holding means 4 has a plurality of holding pieces (41, 42) for holding the end 12 of the core wire of the lead wire inserted through the lead wire insertion hole provided in the side wall of the insulating case 1. Therefore, at least one holding piece 41 of the plurality of holding pieces has an edge portion 41c that bites into the core wire when a pulling force is applied to the end portion of the held core wire. The tubular portion 7b of the connecting terminal portion 7 is provided with a notch portion 7a extending in the axial direction of the tubular portion and into which a connecting wire extending from the flyback transformer side is inserted.

[0007]

[Action]

 In the high voltage variable resistor of the present invention, when the output lead wire is inserted into the lead wire insertion hole, the lead wire holding pieces 41 and 42 hold the core wire 12 of the lead wire, and pulling force is applied to the lead wire. Then, the edge portion 41c bites into the core wire of the lead wire to prevent the lead wire from coming off. Therefore, according to the present invention, in addition to using the conductive rubber for the electrical connection with the flyback transformer, the lead wire can be connected in the final step of the assembly, so that the high voltage variable resistor is not assembled. Of course, it becomes easy to combine the high-voltage variable resistor and the flyback transformer. Also, since a lead wire of an appropriate length can be attached according to the model used, the versatility of the high voltage variable resistor can be enhanced.

Further, in the present invention, since the conductive rubber 7c for connection is fitted into the tubular portion 7b and fixed to the insulating resin layer 6 of the high voltage variable resistor, the conductive rubber 7c is flyback transposed. No need to fix it to the side. Therefore, the variable resistor for high voltage can be combined with the flyback transformer by filling the opening of the insulating case 1 with the mold resin of the flyback transformer. Particularly, in the present invention, since the cylindrical portion 7b into which the conductive rubber 7c is fitted is provided with the cutout portion 7a which extends in the axial direction of the cylindrical portion and into which the connecting line extending from the flyback transformer side is inserted, is provided. Even after combining the transformer case with a high-voltage variable resistor, you can easily insert a finger through the mold resin filling opening of the flyback transformer case and connect the connecting wire extending from the flyback transformer side to the conductive rubber. Can be crowded. It is possible to insert a connecting wire extending from the flyback transformer side into the conductive rubber 7c at the same time when the high voltage variable resistor is combined with the flyback transformer case. It must be fixed accurately and firmly in place, which is not always practical. If the connecting wire extending from the flyback transformer side is to be inserted from the end of the conductive rubber in the axial direction, make sure there is enough space to allow the insertion work at the end of the conductive rubber in the axial direction. Since it is necessary to provide the flyback transformer, there is a problem that the diameter of the case of the flyback transformer must be increased.

[0009]

【Example】

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

FIG. 1 is a partial sectional view showing an embodiment in which the present invention is applied to a high voltage variable resistor having a focus output and a screen output used in a part of a flyback transformer of a television. FIG. 2 also shows a side view of the resistor of FIG. In these drawings, reference numeral 1 denotes an insulating case formed of an insulating resin material and having an opening at one end. The front wall 1a of the insulating case 1 has an operating shaft 2a for operating a slider of two variable resistors and Tubular protrusions 1b1 and 1b2, through which 2b respectively pass, are projected. The configuration itself of the variable resistor of the present embodiment is well known, and therefore, illustration and description thereof will be omitted. On one side wall portion 1c in the longitudinal direction of the insulating case 1, a lead wire holding cylinder 3 that integrally holds the lead wire is provided so as to project from the insulating case 1. A lead wire for inserting the focus output to the outside is inserted into the lead wire holding cylinder 3. A flange portion 1e is provided around the opening 1d of the insulating case 1.

The inside of the insulating case 1 is partitioned by a partition wall 1f into a component storage chamber 1g in which a slider (not shown) is stored and a holding piece storage chamber 1h in which a lead wire holding means 4 described later is stored. . The partition wall 1f is provided to prevent outside air that enters the holding piece storage chamber 1h from entering the component storage chamber 1g and to improve the insulating property.

As shown in FIG. 2, the side wall portion 1 i of the case 1 is provided with a second lead wire holding cylinder 3 ′ similar to the lead wire holding cylinder 3, and this second lead wire holding cylinder 3 ′ is provided. A lead wire for drawing the screen output to the outside is inserted into the cylinder 3 ', and a holding piece storage chamber 1h is also provided in the case 1 corresponding to the lead wire holding cylinder 3'. Although not shown, the lead wire holding means 4 is also stored in the holding piece storage chamber 1h provided corresponding to the lead wire holding cylinder 3 '.

The lead wire holding cylinder 3 is provided in order to improve the insulation property particularly when a high voltage is output to the outside as in the present embodiment, and is especially provided when the output voltage is low. There is no need. A through hole is formed inside the lead wire holding cylinder 3, and the through hole has a diameter dimension substantially equal to the outer diameter dimension of the covering cord of the lead wire to be inserted, and one end is on the end face side of the lead wire holding barrel 3. A large-diameter portion 3a that opens, a taper portion 3b that continuously extends to the other end of the large-diameter portion 3a, and has a diameter that gradually decreases in the lead wire insertion direction (the direction of the arrow in the drawing), and the taper portion 3b that is continuous. And a small diameter portion 3c having one end opened to the holding piece storage chamber 1h in the case 1. The diameter of the small-diameter portion 3c is set to be slightly larger than the outer diameter of the end of the core wire of the lead wire (not shown).

In this embodiment, the tapered portion 3b and the small diameter portion 3c form a lead wire insertion hole provided in the side wall portion of the insulating case 1. If the lead wire holding cylinder 3 having such a long length is provided, the lead wire becomes substantially straight while the lead wire is inserted, so that the end of the core wire of the lead wire has a shape extending in the insertion direction of the lead wire. Be shaped. Further, the taper portion 3b forming a part of the lead wire insertion hole effectively acts to guide the end portion of the core wire of the lead wire to the center position. Even if the lead wire holding cylinder 3 is not provided, if the tapered portion 3b is provided, the end portion of the core wire of the lead wire can be smoothly inserted into the case.

Reference numeral 5 denotes an insulating circuit board having a resistor circuit pattern including a focusing resistor and a screen resistor on a surface (not shown). The circuit board 5 is arranged so as to come into contact with the step portion 1j provided on the inner peripheral wall of the insulating case 1 and one end surface 1f1 of the partition wall 1f. The fixing of the circuit board 5 is generally performed using a thermosetting adhesive. In particular, the use of an adhesive agent for mounting the circuit board 5 enhances the insulating property of the component storage chamber 1g and prevents moisture from entering the component storage chamber 1g in the electronic component handling high voltage as in this embodiment. This is to prevent

A space formed by the back surface 5 a of the circuit board 5 and the inner peripheral wall of the case 1 is filled with a thermosetting resin to form an insulating resin layer 6. The insulating resin layer 6 is provided mainly for strengthening the insulating property.

A member denoted by reference numeral 7 protruding from the opening side of the case 1 is a connecting terminal portion connected to an electrode (not shown) provided on the back surface 5 a side of the substrate 5. The connecting terminal portion 7 is composed of a tubular portion 7b having a notch portion 7a extending in the axial direction and having a C-shaped cross section, and a cylindrical conductive rubber 7c fitted in the tubular portion 7b. The connection terminal 8 protruding from the back surface 5a side of the substrate 5 is inserted into the conductive rubber 7c. When connecting a connecting wire such as a lead wire extending from the flyback transformer side to the connecting terminal portion 7, the end of the core wire of the lead wire from the axial end face side of the tubular portion 7b or the cutout portion 7a side. The part may be inserted into the conductive rubber 7c. By using the connection terminal portion 7 having such a configuration, the lead wire can be easily connected. In order to facilitate the insertion of the core wire of the lead wire, it is preferable to make the tip of the core wire of the lead wire sharp.

A rod-shaped member protruding toward the other end face 1 k side in the longitudinal direction of the case 1 is a grounding connection terminal 9 made of a conductive metal material. Reference numeral 10 denotes a lead wire holding piece provided on the outer peripheral portion of the case 1 of the lead holding cylinder 3 near the side wall portion 1c. The lead wire holding piece 10 holds the lead wire led out from the lead wire holding tube 3'for drawing the screen output to the outside. The lead wire holding piece 10 is provided with a fitting groove 10a into which the lead wire is fitted.

The specific configuration of the lead wire sandwiching means housed in the sandwiching piece housing chamber 1h is as shown in FIGS. 3 to 6. The pair of sandwiching pieces used in this embodiment are integrally formed by punching and press-molding a conductive metal plate having a rigid material, for example, phosphor bronze as a main material.

FIG. 3 shows a front view of the lead wire holding means 4 having a pair of holding pieces integrally formed, FIG. 4 is a sectional view taken along line IV-IV of FIG. 3, and FIG. 5 is a plan view. ing. The lead wire holding means 4 has an insertion portion 4a which is inserted into a mounting through hole 5b (FIG. 1) provided in the circuit board 5. As shown in FIG. 3, the insertion portion 4a has a convex shape, and the bent portion 4a2 has the back surface 5a of the circuit board 5 with the base portion 4a1 inserted in the mounting through hole 5b provided in the substrate 5. The lead wire holding means 4 is bent to the side to prevent the lead wire holding means 4 from coming off (see FIG. 1).

The portion indicated by reference numeral 4b in FIG. 4 is a flat portion having a surface 4b1 which extends continuously from the insertion portion 4a and is in contact with the surface of the substrate 5, and as shown in FIG. A soldering portion 11 is formed between the non-contact surface 4b2 and an electric circuit (not shown) provided on the surface of the circuit board 5. The flat portion 4b is continuously provided with a rising portion 4c extending in a direction substantially perpendicular to the surface of the circuit board 5. The standing portion 4c is composed of a first portion 4c1 located on the front surface side of the substrate 5 and a second portion 4c2 formed of a pair of rectangular plate members standing up from both sides of the first portion 4c1. .

One end of a first holding piece 41 formed by cutting and raising a metal plate is fixed to the central portion of the first portion 4c1 of the standing portion 4c. At the end of the upright portion 4c opposite to the first portion 4c1 of the second portion 4c2, a support portion 4d for supporting a second holding piece 42, which will be described later, is provided on the upright portion 4c as shown in FIG. It is provided so as to extend in a direction substantially perpendicular thereto. The first holding piece 41 and the second holding piece 42 hold the lead wire by holding the end portion of the core wire of the lead wire.

As shown in FIG. 4, the first holding piece 41 is pushed by the end portion 12 of the core wire of the lead wire shown by the alternate long and short dash line so as to be inclined in the insertion direction (the direction of the arrow in FIG. 4). It is configured. Note that FIG. 4 is a cross-sectional view in which the end 12 of the core wire of the lead wire is inserted all the way to the back. The state of the first holding piece 41 before the lead wire is inserted all the way is shown in FIG. This is as indicated by the dotted line. The first holding piece 41 includes a flat plate portion 41a whose one end is fixed to the first portion 4c1 of the upright portion 4c and a contact portion 41b which is bent from the other end of the flat plate portion 41a in the insertion direction of the lead wire. I have it. When the lead wire is inserted in the insertion direction at the other end of the first sandwiching piece 41, that is, at the tip of the contact portion 41b, the lead wire comes into contact with a part of the outer periphery of the end portion 12 of the core wire of the lead wire, An edge portion 41c is provided so as to bite into a part of the outer circumference of the lead wire when is pulled in the direction opposite to the insertion direction. As shown in the plan view of the first holding piece 41 shown in FIG. 6 and the front view of FIG. 3, the contact portion 41b of the first holding piece 41 uses, for example, a jig having a corner portion in the insertion direction. The edge portion 41c is formed by pressing to form two inclined surfaces 41c1 extending outward.

The second holding piece 42 has a substantially semi-cylindrical shape, and has a taper for smoothly receiving the end 12 of the core wire of the lead wire at the end on the side where the lead wire is inserted. The part 42a is formed. The second sandwiching piece 42 cooperates with the first sandwiching piece 41 to sandwich the end portion 12 of the core wire of the lead wire and to make good electrical connection with the end portion 12 of the core wire of the lead wire. Is configured. In particular, in this embodiment, since the second holding piece 42 is formed in a substantially semi-cylindrical shape, the inner peripheral surface 42b is as close as possible to the outer peripheral surface of the core wire of the lead wire to increase the contact area. , Good electrical contact can be obtained.

In order to smoothly insert the end 12 of the core wire of the lead wire, the inner peripheral surface 42 b of the second holding piece 42 is provided with a lead wire insertion hole formed in the wall portion of the case 1. It is preferable to position it on the extension line of the inner peripheral surface of the small-diameter portion 3c (FIG. 1) forming a part, or to arrange it so as to be positioned above the extension line. This is because when the second holding piece 42 is arranged such that the inner peripheral surface 42b of the second holding piece 42 is located significantly below the extension line of the inner peripheral surface of the small diameter portion 3c of the through hole, This is because the end edge 12a of the end portion 12 of the core wire comes into contact with the end surface above the tapered portion 42a of the second holding piece 42, so that the lead wire may not be inserted smoothly.

The length dimension L of the second holding piece 42 in the insertion direction of the lead wire may be such that the lead wire can be held between the second holding piece 42 and the first holding piece 41. In order to surely clamp the end 12 of the core wire of the lead wire, the first clamping piece 41 is positioned at the maximum inclined position (the position shown in FIG. 4) before the tip of the first clamping piece 41. The dimension L is preferably determined so that the second clamping piece 42 is present up to the position.

In this embodiment, fixing means for fixing the second sandwiching piece to the substrate 5 is constituted by the insertion portion 4a, the flat plate portion 4b, the rising portion 4c and the like.

The mounting of the lead wire will be described below with reference to FIGS. 4 and 7. First, at the initial stage of inserting the end portion 12 of the core wire of the lead wire, the edge 12a of the end portion 12 of the core wire first contacts the two inclined surfaces 41c1. While the end edge 12a of the end 12 of the core wire is in contact with the inclined surface 41c 1, the first holding piece 41 is pushed by the end 12 of the core wire of the lead wire and is centered on one fixed end. Incline while increasing the angle of inclination in the insertion direction. When the end 12 of the core wire of the lead wire is further inserted in the insertion direction, a part of the outer periphery of the end 12 of the core wire is formed at the boundary between the inclined surface 41c1 and the end surface 41b1 of the contact portion 41b as shown in FIG. It comes into contact with the edge 41c2. In such a state, the increase of the inclination angle of the first holding piece 41 stops. In this state, the end portion 12 of the core wire is strongly pressed against the inner peripheral surface 42b of the second holding piece 42 by the spring force that tries to return the first holding piece 41 to the original direction.

After the insertion of the lead wire is stopped, if a force is applied to the lead wire in a direction opposite to the insertion direction, that is, a pulling force is applied to the lead wire for some reason, a pulling force that causes the first clamping piece 41 to return to the original position is obtained. Since the first clamping piece 41 has a strength that does not deform unless a force of a predetermined force (for example, about 5 kg) or more is applied, the first clamping piece 41 is provided at the front end portion of the first clamping piece 41. The edge 41c2 of the formed edge portion 41c bites into a part of the outer circumference of the end 12 of the core wire of the lead wire to prevent the lead wire from coming off.

In the above embodiment, the inclination angle of the first holding piece 4 1 before the end 12 of the core wire of the lead wire is inserted is set to about 10 °. The inclination angle of the first holding piece 41 is such that when the lead wire is inserted, the end portion of the core wire of the lead wire smoothly enters between the first holding piece 41 and the second holding piece 42 and Any angle may be used as long as it can be inclined in the insertion direction while being in contact with the outer circumference of the end portion 12.

In the above embodiment, since the lead wire holding means 4 does not come into contact with the case 1 at all, it is possible to prevent the inconvenience that the current leaks through the case 1 even when a high voltage is output. it can. Further, since the lead wire holding means 4 is integrally formed of a conductive metal plate, there is an advantage that the attachment is easy and the mechanical strength is strong. Further, since the lead wire holding cylinder 3 and the partition wall 1f are provided, sufficient insulation can be obtained even when outputting a high voltage.

[Modification of Embodiment] In the above-mentioned embodiment, the pair of sandwiching pieces are integrally formed. However, the first sandwiching piece 41 is formed separately from the second sandwiching piece 42, and each of them is individually formed. It may be fixed. When the first holding piece 41 is formed separately, it goes without saying that the first holding piece 41 may be made of an insulating material. When the first holding piece 41 is separately formed and fixed, the fixed side end of the holding piece may be fixed to the inner surface of the case 1 when the output voltage is low.

Further, in the above embodiment, the lead wire holding means 4 is configured such that the second holding piece 42 is located on the case 1 side and the first holding piece 41 is located on the substrate 5 side. The positional relationship between the second sandwiching piece 42 and the first sandwiching piece 41 may be reversed, and the second sandwiching piece 42 and the first sandwiching piece 41 are arranged so as to face each other in the lateral direction. Of course, you can do that.

In the above embodiment, the shape of the first holding piece 41 is substantially rectangular, the shape of the edge 41c2 of the edge portion 41c is an isosceles triangle, and the contact surface 41c1 has two surfaces. However, the shape of the edge portion 41c provided at the tip (the other end) of the first holding piece 41 is such that the outer circumference of the end portion of the core wire of the lead wire is smoothly contacted and the lead wire is pulled in the direction opposite to the insertion direction. Any shape may be used as long as it digs into the outer circumference of the core wire of the lead wire when it is struck. For example, the shape of the edge 41c2 may be a substantially semicircular shape like the shape of the inner peripheral surface of the second holding piece 42, or may be a multi-sided shape.

The shape of the second holding piece 42 may be any shape as long as a sufficient contact area can be obtained. For example, the cross-sectional shape may be V-shaped or more polyhedral. Further, as shown in FIG. 8, if the rear end of the second holding piece 42 in the insertion direction is inclined toward the substrate 5, the end of the core wire of the lead wire can be held more strongly.

As shown in FIG. 1, since the above embodiment outputs a high voltage, the lead wire holding means 4 is fixed at a position apart from the inner wall of the case, but a relatively low voltage is output. In this case, the lead wire holding means 4 can be arranged close to the inner wall of the case 1. With this configuration, even when a strong pulling force acts on the lead wire, the holding means can be brought into contact with the inner wall surface of the case 1, and the holding means can be prevented from tilting.

In the above-described embodiment, only one of the sandwiching pieces is configured to be tiltable and the inclined sandwiching piece is provided with the edge portion. However, as shown in FIG. 9, the first and second sandwiching pieces are provided. Both the pieces 41 and 42 may be configured to be inclined by being pushed by the end portion of the lead wire to be inserted, and the edge portion may be provided at the tip end portion of each sandwiching piece. In this way, if all the sandwiching pieces can be tilted and the edge portions are provided at the tips of the sandwiching pieces, the lead wire can be more firmly prevented from coming off.

In the above embodiment, two sandwiching pieces are used, but the number of sandwiching pieces is not limited to two, and as shown in FIG. 10, three or more sandwiching pieces 41 ′, Of course, 42 ′ and 43 ′ may be arranged at equal intervals around the core of the lead wire so as to sandwich the ends of the core of the lead wire.

It should be noted that which of the plurality of holding pieces is to be electrically connected to the electrode of the circuit board 5 is arbitrary. Of course, all or part of the sandwiching piece may be fixed to the case according to the magnitude of the voltage or current output from the lead wire.

[0040]

[Effect of device]

 According to the high-voltage variable resistor of the present invention, in addition to the use of conductive rubber for electrical connection with the flyback transformer, the output lead wire can be connected in the final step of assembly. This makes it easy to assemble the variable resistor for high voltage and to combine the variable resistor for high voltage with the flyback transformer. Also, since the lead wire of an appropriate length can be attached according to the model, the versatility of the high voltage variable resistor can be enhanced.

In particular, according to the present invention, since the conductive rubber for connection is inserted into the tubular portion and fixed to the insulating resin layer of the high voltage variable resistor, the conductive rubber is fixed to the flyback transformer side. The variable resistor for high voltage can be combined with the flyback transformer by filling the mold resin of the flyback transformer into the opening of the insulating case without the need. Further, according to the present invention, since the cylindrical portion into which the conductive rubber is fitted is provided with the notch portion which extends in the axial direction of the cylindrical portion and into which the connecting line extending from the flyback transformer side is inserted, the case of the flyback transformer is provided. Even after assembling the high-voltage variable resistor to the, the connecting wire extending from the flyback transformer side can be easily inserted into the conductive rubber by inserting a finger from the mold resin filling opening of the flyback transformer case. The advantage is that the flyback transformer can be easily assembled.

[Submission date] September 29, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

[0006]

[Means for Solving the Problems]

The high-voltage variable resistor of the present invention is a high-voltage variable resistor that is used in combination with a flyback transformer . As shown in the embodiments shown in FIGS . 1 to 7 , a variable resistor is provided on the surface. A circuit board 5 having a resistor circuit pattern including the above is housed inside an insulating case 1 having an opening at one end, and a slider is housed between the insulating case 1 and the surface of the circuit board 5, and the opening of the insulating case 1 is formed. The insulating resin layer 6 is formed on the back side of the circuit board by filling the portion with insulating resin, and the side wall portions (1c, 1i) of the insulating case 1 have lead wire insertion holes (3b) into which lead wires for output are inserted. , 3c) are formed, and the connecting terminal portion 7 in which the conductive rubber 7c is fitted in the tubular portion 7b projects from the insulating resin layer 6. Between the insulating case 1 and the circuit board 5, the lead wire holding means 4 electrically connected to the output electrode of the resistor circuit pattern on the circuit board is arranged. The lead wire holding means 4 has a plurality of holding pieces (41, 42) for holding the end 12 of the core wire of the lead wire inserted from the lead wire insertion hole provided in the side wall of the insulating case 1. At least one holding piece 41 of the plurality of holding pieces has an edge portion 41c that bites into the core wire when a pulling force is applied to the end portion of the held core wire. The tubular portion 7b of the connecting terminal portion 7 is provided with a notch portion 7a extending in the axial direction of the tubular portion and into which a connecting wire extending from the flyback transformer side is inserted.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

[0007]

[Action]

In the high-voltage variable resistor of the present invention, when the output lead wire is inserted into the lead wire insertion hole, the lead wire holding pieces 41 , 42 hold the core wire 12 of the lead wire, and pulling force is applied to the lead wire. Then, the edge portion 41c bites into the core wire of the lead wire to prevent the lead wire from coming off. Therefore, according to the present invention, in addition to using the conductive rubber for the electrical connection with the flyback transformer, the lead wire can be connected in the final step of the assembly, so that the high voltage variable resistor is not assembled. Of course, it becomes easy to combine the high-voltage variable resistor and the flyback transformer. Also, since a lead wire of an appropriate length can be attached according to the model used, the versatility of the high voltage variable resistor can be enhanced.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction content]

A member denoted by reference numeral 7 protruding from the opening side of the case 1 is a connecting terminal portion connected to an electrode (not shown) provided on the back surface 5 a side of the substrate 5. The connecting terminal portion 7 is composed of a tubular portion 7b having a notch portion 7a extending in the axial direction and having a C-shaped cross section, and a cylindrical conductive rubber 7c fitted in the tubular portion 7b. The connection terminal 8 protruding from the back surface 5a side of the substrate 5 is inserted into the conductive rubber 7c. When connecting a connecting wire such as a lead wire extending from the flyback transformer side to the connecting terminal portion 7, the end of the core wire of the lead wire from the axial end face side of the tubular portion 7b or the cutout portion 7a side. The part may be inserted into the conductive rubber 7c. If put use the connecting terminal portions 7 of such a configuration, it is possible to easily connect the lead wire. In order to facilitate the insertion of the core wire of the lead wire, it is preferable to make the tip of the core wire of the lead wire sharp.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0020

[Correction method] Change

[Correction content]

FIG. 3 shows a front view of the lead wire holding means 4 having a pair of holding pieces integrally formed, FIG. 4 is a sectional view taken along line IV-IV of FIG. 3, and FIG. 5 is a plan view. ing. The lead wire holding means 4 has an insertion portion 4a which is inserted into a mounting through hole 5b (FIG. 1) provided in the circuit board 5. As shown in FIG. 3 , the insertion portion 4a has a convex shape, and when the base portion 4a1 is inserted into the mounting through hole 5b provided in the board 5, the bent portion 4a2 is formed on the back surface 5a of the circuit board 5. It is bent to the side to prevent the lead wire holding means 4 from coming off (see FIG. 1).

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction content]

The portion indicated by reference numeral 4b in FIG. 4 is a flat portion having a surface 4b1 which extends continuously from the insertion portion 4a and is in contact with the surface of the substrate 5, and as shown in FIG. A soldering portion 11 (see FIG. 1) is formed between the non-contact surface 4b2 and an electric circuit (not shown) provided on the surface of the circuit board 5. The flat portion 4b is continuously provided with a rising portion 4c extending in a direction substantially perpendicular to the surface of the circuit board 5. The upright portion 4c is composed of a first portion 4c1 located on the front surface side of the substrate 5 and a second portion 4c2 formed of a pair of rectangular plate members upright from both sides of the first portion 4c1.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0028

[Correction method] Change

[Correction content]

[0028] Referring to following figure. 4 and 7 will be described mounting of the leads. First, in the initial stage of insertion of the end portion 12 of the core wire of the lead wire, the edge 12a of the end portion 12 of the core wire first comes into contact with the two inclined surfaces 41c1. While the edge 12a of the end 12 of the core wire is in contact with the inclined surface 41c1, the first holding piece 41 is pushed by the end 12 of the core wire of the lead wire and inserted around the fixed end. Incline while increasing the angle of inclination in the direction. When the end portion 12 of the core wire of the lead wire is further inserted in the insertion direction, a part of the outer circumference of the end portion 12 of the core wire is formed at the boundary between the inclined surface 41c1 and the end surface 41b1 of the contact portion 41b as shown in FIG. It comes into contact with the edge 41c2. In such a state, the increase of the inclination angle of the first holding piece 41 stops. In this state, the end portion 12 of the core wire is strongly pressed against the inner peripheral surface 42b of the second holding piece 42 by the spring force of returning to the original direction of the first holding piece 41.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0031

[Correction method] Change

[Correction content]

[0031] In the above embodiment employs a configuration in which the case 1 does not contact the lead wire clamping means 4 at all Tei because, even in the case of outputting a high voltage, it is possible to prevent the inconvenience current through casing 1 leaks . Further, since the lead wire holding means 4 is integrally formed of a conductive metal plate, there is an advantage that the attachment is easy and the mechanical strength is strong. Further, since the lead wire holding cylinder 3 and the partition wall 1f are provided, sufficient insulation can be obtained even when outputting a high voltage.

[Brief description of drawings]

FIG. 1 is a partial sectional view of an embodiment of a high voltage variable resistor according to the present invention.

FIG. 2 is a side view of the variable resistor of FIG.

FIG. 3 is a front view of a lead wire holding means used in the embodiment of FIG.

4 is a sectional view taken along line IV-IV in FIG.

5 is a plan view of the lead wire holding means of FIG. 3. FIG.

FIG. 6 is a plan view of a first sandwiching piece.

FIG. 7 is an explanatory diagram showing a relationship between an end portion of a core wire of a lead wire and an edge portion of a first sandwiching piece.

FIG. 8 is a cross-sectional view showing a modified example of the second sandwiching piece.

FIG. 9 is a sectional view showing another embodiment of the lead wire holding means.

FIG. 10 is an explanatory view showing still another embodiment of the lead wire holding means.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulation case 3, 3'Lead wire holding cylinder 3b Reduced diameter portion 3c Small diameter portion 4 Lead wire holding means 5 Circuit board 6 Insulating resin layer 7 Connection terminal portion 7a Cutout portion 7b Cylindrical portion 7c Conductive rubber 8 Connection terminal 12 End of core wire of lead wire 41 First sandwiching piece 41c Edge portion 42 Second sandwiching piece

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[Procedure amendment]

[Submission date] September 29, 1993

[Procedure Amendment 8]

[Document name to be amended] Statement

[Correction target item name] Explanation of code

[Correction method] Change

[Correction content]

[Explanation of Codes] 1 Insulation case 3 , 3'Lead wire holding cylinder 3b Reduced diameter portion 3c Small diameter portion 4 Lead wire holding means 5 Circuit board 6 Insulating resin layer 7 Connection terminal portion 7a Cutout portion 7b Cylindrical portion 7c Conductivity Rubber 8 Connection terminal 12 End of core wire of lead wire 41 First holding piece 41c Edge portion 42 Second holding piece

[Procedure Amendment 9]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 4

[Correction method] Change

[Correction content]

[Figure 4]

Claims (1)

[Scope of utility model registration request] 1. A circuit board (5) having a resistor circuit pattern including a variable resistor on a surface thereof is housed inside an insulating case (1) having an opening at one end, the insulating case (1) and the circuit board. A slider is accommodated between the surface of (5) and the opening of the insulating case (1) is filled with an insulating resin to form an insulating resin layer (6) on the back surface side of the circuit board, Lead wire insertion holes (3b, 3) into which output lead wires are inserted are formed in the side wall portions (1c, 1i) of the insulating case (1).
c) is formed, and the connecting terminal portion (7) in which the conductive rubber (7c) is fitted in the tubular portion (7b) is projected from the insulating resin layer (6), and is combined with the flyback transformer. A variable resistor for high voltage used, which is electrically connected to an output electrode of the resistor circuit pattern on the circuit board between the insulating case (1) and the circuit board (5). Lead wire holding means (4) is arranged, and the lead wire holding means (4) is the insulating case (1).
Has a plurality of holding pieces (41, 42) for holding the end portion (12) of the core wire of the lead wire inserted from the lead wire insertion hole provided in the side wall part of the plurality of holding pieces. At least one holding piece (41) has an edge portion (41c) that bites into the core wire when a pulling force is applied to the end portion (12) of the held core wire, and the connecting terminal portion (41) 7) A high pressure characterized in that the tubular portion (7b) is provided with a notch portion (7a) extending in the axial direction of the tubular portion and into which a connecting line extending from the flyback transformer side is inserted. Variable resistor for.