JPH1012419A - Variable resistor unit for high voltage and electric component for high voltage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent terminal metal fittings from coming out, and miniaturize a variable resistor unit for high voltage, by making the size of a circuit board smaller than the conventional one. SOLUTION: A circuit board 1 wherein a resistor pattern containing a plurality of variable resistors is formed on the surface is arranged in a board housing chamber 3 of an insulating case 2. Terminal metal fittings 8 and a slider 7 are so constituted that the contact point of a plane type part 7c of the slider 7 and a contact point part 8a of the terminal metal fittings 8 is arranged keeping an interval from the surface of the circuit board 1 to an operating member 4 side. A protrusion 8d for fitting of the terminal metal fittings 8 is inserted in a fitting hole 2c of the insulating case 2. An encroaching part, which prevents the protrusion 8d from coming out out of the fitting hole 2c by cutting into a wall part surrounding the periphery of the fitting hole 2c of the insulating case 2, is collectively formed in a unified body with the protrusion 8d.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-voltage variable resistor unit and a high-voltage electric component.

[0002]

2. Description of the Related Art FIG. 7 shows an example of a circuit board used in a high-voltage variable resistor unit which is a typical example of a high-voltage electric component. FIG. 7 is a plan view of a circuit board 101 used for a conventional high-voltage variable resistor unit called a focus pack capable of variably outputting a focus voltage and a screen voltage. The resistor pattern 10 printed on the surface of the circuit board 101
Reference numeral 2 denotes an input electrode E1, a focus voltage output electrode E2, a screen voltage output electrode E3, and a ground electrode E4, a first variable resistor VR'1 for varying a focus voltage, and a second variable resistor for varying a screen voltage. And a fixed resistor R ′ for voltage drop called a bleeder resistor. The resistor pattern 102 includes connection patterns CP1 and CP as connection means for contacting a slider (not shown) and electrically connecting the slider to the output electrodes E1 and E2.
2 is provided. The slider is a variable resistor VR'1, VR
'2 sliding contacts and connection patterns CP1, CP
And a contact point that rotates on the second ends CP11 and CP21.

[0003]

The size of the variable resistor unit for high voltage is usually determined by the area of the circuit board 101, and the area of the circuit board 101 is
Depends on When the resistor pattern 102 is determined, the distance between adjacent portions of the resistor pattern 102 is determined in consideration of a so-called pattern withstand voltage (normally 1 mm / 1 kV) that can prevent the occurrence of discharge. Therefore, the variable resistors VR'1 and VR'2 and the connection pattern CP
The distances A and B between the end portions CP1 and CP21 of CP1 and CP2 are also restricted by the pattern withstand voltage. As a result, according to the magnitude of the applied voltage, the variable resistors VR'1 and VR '
The necessity of increasing the radius of the second arc arises, and there is a limit in reducing the area of the circuit board.

An object of the present invention is to provide a high-voltage variable resistor unit and a high-voltage electric component capable of reducing the area of a circuit board and securely fixing the circuit board to an insulating case. Is to provide.

It is another object of the present invention to provide a high-voltage variable resistor unit and a high-voltage electric component which can securely fix a terminal fitting to a substrate supporting rib of an insulating case. .

Still another object of the present invention is to allow a fitting projection of a terminal fitting to be easily inserted into a fitting hole formed in a substrate supporting rib of an insulating case, and that the fitting projection is fitted. It is an object of the present invention to provide a high-voltage variable resistor unit and a high-voltage electric component that can prevent the slipping out of the hole.

Another object of the present invention is to provide a high-voltage variable resistor unit which can prevent the arm of the terminal fitting from vibrating.

[0008]

A high-voltage variable resistor unit to be improved by the present invention comprises: a circuit board having a surface on which a resistor pattern including at least one variable resistor is formed;
An insulating case made of an insulating resin having a board storage chamber in which the circuit board is housed and a board supporting rib to which the circuit board is bonded using an adhesive; and an insulating case disposed between the surface of the circuit board and the insulating case. One or more sliders sliding on the one or more variable resistors, an operating member having one or more operating shafts for operating the one or more sliders, and electrically connected to the corresponding sliders. And one or more terminal fittings (generally used as output terminal fittings, but may be used as input terminal fittings depending on the circuit configuration).

In a conventional high-voltage variable resistor unit,
A connection pattern is formed on the surface of the circuit board as connection means for electrically connecting the output electrode and the slider, and a part of the slider is brought into contact with an end of the connection pattern.
That is, in the conventional high-voltage variable resistor unit, the contact point between the connecting means and the slider is on the surface of the circuit board. On the other hand, in the present invention, the connection means is constituted by terminal fittings. Therefore, in the present invention, the slider is provided with a supported portion supported by the operation member. The terminal fitting includes a contact portion that contacts the supported portion of the slider so as to allow rotation of the slider, a terminal portion, and a contact support portion that connects the contact portion and the terminal portion. . Then, the contact points between the slider and the contact portions of the terminal fittings are arranged at an interval from the surface of the circuit board to the operation member (that is, the contact points are located away from the surface of the circuit board). And a terminal fitting and a slider.

From a design standpoint, the terminal fittings (particularly, contact support portions) and the sliders are configured such that the maximum potential difference between the terminal fittings and the slider and the variable resistor is smaller than the potential at which discharge occurs. Will do. According to the present invention,
Since there is no point of contact between the connecting means and the slider at the center of the variable resistor as in the prior art, the radius of curvature of the variable resistor can be made much smaller than in the prior art. As a result, the resistor pattern formed on the surface of the circuit board also becomes smaller,
The circuit board is small, and the high-voltage variable resistor unit can be downsized.

The contact support of the terminal has a function of pressing the contact against the supported part of the slider and a function of positioning the terminal on the substrate supporting rib. In order to obtain these functions, the contact support portion of the terminal fitting is provided with a fitting protruding portion fitted into a fitting hole formed in the substrate supporting rib, and the contact portion is provided at the tip, and the contact portion is slid. It has an arm part having a spring force for pressing the child toward the supported part, and an intermediate part located between the fitting protrusion and the arm part. It is preferable that the intermediate portion includes an extension extending along the side wall surface surrounding the substrate storage chamber, and a connecting portion connecting the fitting protrusion and the extension. In this case, the substrate supporting ribs
A groove into which the connecting portion of the contact support portion is fitted so as not to hinder the joining of the circuit board is formed.

If the fittings of the terminal fittings are simply fitted into the fitting holes formed in the substrate supporting ribs and the terminal fittings are positioned, the fitting projections may fall out of the fitting holes in the manufacturing process. There is. Even when the fitting protrusion is tightly fitted into the fitting hole, the fitting protrusion tends to gradually move in a direction to come out of the fitting hole. It is presumed that this is because the fitting protrusion is pushed out of the fitting hole by the force of the insulating resin material forming the wall around the fitting hole deformed by the fitting protrusion to return to the original state. . When the fitting protrusion of the terminal fitting moves in a direction to come out of the fitting hole, the terminal fitting floats from the board supporting rib. In such a state, an adhesive is applied to the substrate supporting ribs, and then the circuit board is bonded to the substrate supporting ribs. It is joined in an inclined state,
The terminal fitting is fixed to the substrate supporting rib in a posture inclined from the normal posture. In such a state, not only the insulation inside the circuit board storage chamber is reduced, but also the slider does not rotate smoothly, or the electrical connection between the slider and the terminal fitting is poor. Is more likely to occur,
Product yields are poor.

Therefore, in the present invention, the fitting projection of the terminal fitting bites into a wall surrounding the fitting hole formed in the insulating case to prevent the fitting projection from coming out of the fitting hole. Are provided integrally. Providing such a biting portion prevents the fitting protrusion of the terminal fitting from moving out of the fitting hole in the middle of the manufacturing process, and the terminal fitting is held in the proper posture with respect to the substrate supporting rib. Position. As a result, the product yield is greatly improved.

The shape of the terminal fitting, particularly the shape of the fitting projection, is arbitrary. However, when a metal plate is subjected to press working and bending to make a terminal fitting, the fitting protrusion is formed in a flat plate shape, and the biting portion is formed from a pair of edges positioned in the width direction of the fitting protrusion. It is preferable that the projection is formed of one or more pairs of projections projecting outward in the width direction. The pair of protrusions have a tapered portion whose width dimension increases as the distance from the distal end of the fitting protrusion inserted into the fitting hole, and a biting portion formed behind the tapered portion when viewed from the distal end. And a corner. When such a pair of protrusions is provided, when the fitting protrusion is inserted into the fitting hole, the tapered portion of the pair of protrusions deforms in a direction to expand the inner wall portion of the fitting hole. After the insertion of the fitting protrusion into the fitting hole, when the force in the direction of pushing out the fitting protrusion from the fitting hole is applied when the inner wall portion of the fitting hole expanded by the tapered portion tries to return to the original position, the taper portion is applied. With this force, the biting corners bite into the inner wall of the fitting hole. As a result, the fitting protrusion is prevented from falling out of the fitting hole. Therefore, when a pair of protrusions having such a shape is provided, it is easy to insert the fitting protrusion into the fitting hole, and it is possible to reliably prevent the fitting protrusion from coming off the fitting hole. Note that a plurality of pairs of projections may be provided. In this way, the retaining can be more reliably performed.

In order to more reliably position and prevent the terminal fitting from coming off, a cut-and-raised portion is formed in an extension provided on the contact support portion of the terminal fitting. The cut-and-raised portion has a fixed end on the arm portion side and is cut and raised on the fitting protruding portion side. The free end of the cut and raised part
When the terminal fitting moves in a direction away from the insulating case (the direction opposite to the direction in which the terminal fitting is inserted into the fitting hole [non-insertion direction]), the terminal fitting is cut into the side wall surface surrounding the substrate storage chamber. When the cut-and-raised portion is formed in the extension as described above, a part of the substrate supporting rib can be sandwiched by the extended portion and the fitting protrusion, and the cut-and-raised portion also cuts into the side wall surface surrounding the substrate storage chamber. Since the movement of the terminal fitting is prevented, the movement of the terminal fitting can be reliably prevented. In addition, without providing a biting portion in the fitting protrusion, just providing a cut-and-raised portion in the extension portion, when vibration applied from the outside during manufacturing increases,
The terminal fitting may move in the non-insertion direction.

In this case, a pair of projections projecting toward the surface of the circuit board are integrally formed on the wall surface of the insulating case facing the circuit board in the board storage chamber, and the contact support section of the output terminal fitting is formed. May be fitted or positioned between a pair of protrusions. With this configuration, it is possible to prevent the arm portion of the contact support portion of the terminal from swinging, and to ensure electrical contact between the supported portion of the slider and the contact portion of the terminal. I do.

The terminal part of the terminal fitting may be a terminal part having a terminal shape to which a lead wire is connected by soldering, or a terminal having a connection structure of a type in which a lead wire or a pin-shaped terminal is inserted and its outer periphery is clamped. Or a terminal part having a so-called snap-in type connection structure having a holding piece that bites into the outer periphery of the pin-shaped terminal when a pulling force is applied to the inserted pin-shaped terminal or the like. It is. In any case, if the terminal portion is provided integrally with the contact support portion having the positioning structure, there is an advantage that the number of parts is reduced and the number of assembling steps is reduced.

In particular, when the terminal fittings are arranged so that the contact support portions of the terminal fittings cross the variable resistor with a space between them and the corresponding variable resistor (in other words, the terminal portion has an arc-shaped variable resistor). If the terminal metal fittings are located radially outside the arc of the resistor and the contact support portions are spaced from the variable resistor so as to cross over the variable resistor, the size can be further reduced. it can. The interval between the contact support and the variable resistor is, of course, an interval at which no discharge occurs between them. By doing so, the space for arranging the variable resistor on the circuit board, including the space for arranging the positioning portions for the variable resistor and the terminal fittings, can be made smaller. Let L be the distance between the positioning part of the terminal fitting and the center of the arc of the variable resistor, and r be the radius of the arc of the variable resistor. In this case, when the output part of the terminal fitting is positioned radially inside the variable resistor, the length of the longest part of the arrangement space for the variable resistor becomes L + r or more. On the other hand, when the terminal fittings are arranged so that the contact supporting portions cross over the variable resistors with a space between the corresponding variable resistors, the length of the longest part of the space for the variable resistor portions is set. Is at least L. as a result,
The arrangement space for all the variable resistance units on the circuit board can be made smaller. As a result, the length and width of the circuit board can be significantly reduced.

The present invention can also be applied to a high-voltage variable resistor unit having a storage chamber for storing other electronic components such as capacitors in an insulating case. The present invention is also applicable to a high-voltage variable resistor unit that can be combined with a flyback transformer.

Further, the present invention provides not only a high-voltage variable resistor unit but also a circuit board having a circuit pattern formed on a surface thereof, and a board storage chamber in which the circuit board is housed and a circuit board joined with an adhesive. An insulating case made of an insulating resin having a substrate supporting rib, a conductive member arranged in the substrate storage chamber and electrically connected to the circuit pattern, and a terminal fitting electrically connected to the conductive member. The terminal fitting has a contact portion for contacting the conductive member, a terminal portion, and a contact support portion for connecting the contact portion to the terminal portion, and the contact support portion of the terminal fitting is formed on a substrate supporting rib. A fitting protrusion fitted into the mating hole, an arm portion having a contact portion at the tip and having a spring force for pressing the contact portion toward the conductive member, and a position between the fitting protrusion and the arm portion. High voltage power supply having an intermediate part It can also be applied to the part. Even in this case, the fitting protrusion of the terminal fitting is integrally provided with a bite portion that cuts into a wall surrounding the periphery of the fitting hole formed in the insulating case and prevents the fitting protrusion from coming out of the fitting hole. Provide. In such a high-voltage electrical component, the present invention is used in a case where electrodes and the like on a circuit board are electrically connected to terminal fittings without soldering.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1A is a schematic sectional view of a main part of a variable resistor section (screen voltage variable resistor section) used in an embodiment of a high-voltage variable resistor unit according to the present invention. FIG. 1 (B) is a view of the main part of FIG. 1 (A) viewed from the bottom side without the circuit board. The structure of the focus voltage varying resistor is substantially the same. The basic principle and structure of this main part are described in Japanese Patent Application No. 6-32, filed by the applicant.
This is described in detail in Japanese Patent Application No. 7207 and Japanese Patent Application No. 7-184329, which will be described again here. In these figures, 1 is a ceramic circuit board provided with a variable resistor on the surface, and 2 is a one-sided or one-sided opening having a board storage chamber 3 for storing the circuit board 1 and a slider, which will be described later. An insulating case made of an insulating resin. Part of the circuit board 1 is joined to a board supporting rib 2 a formed around the board storage chamber 3 of the insulating case 2 by using an adhesive.

On the surface of the circuit board 1, a resistor pattern as shown in FIG. 2A is formed. A bottom view (a view from the opening side) of the insulating case 2 accommodating the circuit board 1 of FIG. 2A is as shown in FIG. 2B. FIG. 2
The insulating case 2 of FIG. 2B is designed to house the circuit board 1 of FIG. 2A and a capacitor (not shown). The resistor pattern shown in FIG. 2A includes an input electrode E1, a ground electrode E4, and first and second variable resistors V used for screen voltage variation and focus voltage variation.
R1 and VR2 and a fixed resistor R as a bleeder resistor used to lower the voltage applied to these variable resistors are included.

Returning to FIGS. 1A and 1B, reference numeral 4 denotes an operating shaft or shaft portion 4a penetrating the upper side wall portion of the insulating case 2.
And an operation member including a large-diameter slider positioning portion 4b and a stopper portion 4c formed integrally with the shaft portion and located in the substrate storage chamber 3. The operation member 4 is integrally formed using an insulating resin material, and details thereof are shown in FIGS.
It is as shown in (C). A vertical hole 5 and a spacer 6 are formed in an end surface of the slider positioning portion 4b of the operation member 4 on the circuit board 1 side. The spacer portion 6 is provided at a position eccentric from the axis of the operation member 4. The spacer section 6 has a function of restricting the movement of the operation member 4 in the direction toward the circuit board 1 so that a slider 7 described later is not compressed more than necessary when the operation member 4 is operated. The upright portion 7e (FIG. 4) of the slider 7 is fitted into the vertical hole 5, so that the rotation of the slider 7 is prevented. In this embodiment, the vertical hole 5, the spacer 6, and the stopper 4c are arranged so as to be arranged in the radial direction of the operation member 4. Also, two engagement projections 6 are provided at the base of the spacer member.
a and 6a are integrally formed. These engagement projections 6a, 6a are formed so as to be located on both sides of the vertical hole 5.

A protrusion 4d into which a fitting hole 7d (see FIG. 4) formed in the slider 7 is fitted is provided at an end of the slider positioning portion 4b of the operating member 4 facing the circuit board 1. Are integrally formed. The projection 4d is provided for preventing the slider 7 from rotating and for positioning. An annular fitting groove 4 is formed in the slider positioning portion 4b of the operation member 4 so as to open in the direction in which the shaft portion 4a extends and surround the periphery of the shaft portion 4a.
e is formed. A cylindrical portion 2b projecting from the inner wall of the insulating case 2 is fitted into the fitting groove 4e.
The fitting groove 4e and the tubular portion 2b are loosely fitted so that the operation member 4 can rotate.

As shown in detail in FIGS. 4 (A) to 4 (C),
The slider 7 is formed by machining (pressing, bending, or the like) a metal plate of stainless steel, phosphor bronze, or the like. The slider 7 includes an arm portion 7b having a sliding contact 7a at the tip thereof that slides on the variable resistor, and a slider positioning portion 4
and a plate-like portion 7c (supported portion) extending along the end face of the b. The plate-like portion 7c has a sliding portion 7c1 on which the contact portion 8a of the output terminal fitting 8 constituting the connecting means to be described later slides, and a hole forming portion on which a fitting hole 7d through which the projection 4d penetrates is formed. 7c2 and a mounting portion 7c3 located on the opposite side of the sliding portion 7c1 with the hole 7d therebetween. From the mounting portion 7c3, an upright portion 7e fitted into a vertical hole 5 (see FIG. 3) formed at the end of the operation member 4 is provided.
It extends in a direction substantially perpendicular to the plate-like portion 7c (a direction toward the operation member 4). The fixed end of the arm 7b is also fixed to the mounting portion 7c3, and its free end extends toward the sliding portion 7c1. The arm part 7b has an arm part 7b
A slit S for adjusting the resiliency of is formed. The edges of the attachment portions 7c3 located on both sides of the arm portion 7b engage with the engagement projections 6a provided on the end of the operation member 4. The upright portion 7e is fitted into a vertical hole 5 (see FIG. 3) formed at the end of the operation member 4, and the projection 4d of the operation member 4 passes through the hole 7d formed in the plate-like portion 7c. The slider 7 is attached to the operation member 4 so as not to fall off by engaging the edge of the attachment portion 7c3 with the engagement protrusions 6a. Therefore, when assembling the high-voltage variable resistor unit, the slider 7 must be
, Which facilitates the assembling work. With such a structure, the slider 7 can be prevented from vibrating or wobbling after assembly.

Reference numeral 8 denotes a terminal fitting constituting the connection means.
This terminal fitting is used as an output terminal fitting. Like the slider 7, the terminal fitting 8 is formed by machining (pressing, bending, or the like) a metal plate of stainless steel, phosphor bronze, or the like. The details of the terminal fitting 8 are shown in FIG.
(A) to (D). The state shown by the solid line in FIGS. 5A to 5C shows the state when the terminal fitting is attached to the insulating case 1. Figure 5 below
The structure of the terminal fitting 8 will be described with reference to (A) to (D). The terminal fitting 8 includes a contact portion 8a that contacts the plate-like portion 7c of the slider 7, a contact support portion 8b that supports the contact portion 8a, and a terminal portion connected to the other end of the contact support portion 8b. 8c. The contact support portion 8b includes a fitting protrusion 8d fitted into a fitting hole 2c formed in the substrate supporting rib 2a, an extension 8e extending along a side wall surface surrounding the substrate storage chamber 3, and a fitting support 8b. A connecting portion 8f for connecting the protruding portion 8d and the extending portion 8e, and a contact portion 8a provided at a tip end thereof;
And an arm portion 8g having a spring force for pressing the arm 8g toward the plate-like portion 7c of the slider 7.

As shown in FIG. 5, an oval hole 8h is formed at one end (free end) of the terminal portion 8c.
The other end has a hole 8i for cutting and raising the fitting projection 8d.
Are formed. Terminal portions 8c are provided on both sides of the hole 8i.
In order to increase the mechanical strength of the
j is formed. The flat-shaped fitting protrusion 8d formed by cutting and raising a part of the terminal portion 8c is connected to the terminal portion 8c.
It extends in the direction opposite to the direction in which c extends. A pair of edges located (opposed) in the width direction of the fitting projection 8d (in the direction in which the fitting projection 8d extends, that is, in the direction orthogonal to the longitudinal direction of the fitting projection 8d, not in the thickness direction). A pair of projections 8k, 8k protrude outward in the width direction. Each of the pair of projections 8k, 8k has a tapered portion 8k1 whose width dimension increases rearward from the tip of the fitting projection 8d inserted into the fitting hole 2c, and a tapered portion 8k1 as viewed from the tip. And a biting corner 8k2 formed on the rear side. In this example, a straight portion that is not slightly tapered is formed between the tapered portion 8k1 and the biting corner 8k2. This linear portion increases the strength of the biting corner 8k2. The angle θ of the biting corner 8k2 in this example is about 90
Degrees. However, the angle θ may be any acute angle of 90 degrees or less. The angle and length of the tapered portion 8k1 and the size and angle of the biting corner 8k2 are determined so that the following operation can be reliably obtained. The operation is to first deform the tapered portion 8k1 of the pair of projections 8k, 8k so as to partially widen the inner wall portion of the fitting hole 2c when inserting the fitting projection 8d into the fitting hole 2c. It is. Then, after the fitting projection 8d is inserted into the fitting hole 2c, when the inner wall portion of the fitting hole 2c expanded by the tapered portion 8k1 attempts to return to the original position, the fitting projection 8d is inserted into the fitting hole 8c1. The force in the direction of pushing from 2c is applied to the tapered portion 8k1, and the biting corner 8k2 bites into the inner wall of the fitting hole 2c by the force.
With this operation, the fitting projection 8d is prevented from falling out of the fitting hole. In this example, the biting portion is formed by the pair of protrusions 8k, 8k, but a plurality of pairs of protrusions may be formed along the longitudinal direction of the fitting protrusion 8d.

The connecting portion 8f is fitted into a groove 2d formed in the substrate supporting rib 2a. The depth of the groove 2d is
d, the connecting portion 8f is flush with the surface of the substrate supporting rib 2a, or the connecting portion 8f is connected to the substrate supporting rib 2a.
Is determined so as not to protrude more than the surface of. In this way, when the circuit board 1 is joined to the board supporting ribs 2a using an adhesive, the connecting portion 8f can be prevented from hindering the joining.

The extension 8e extends along the side wall 2e surrounding the substrate storage chamber 3. In this example, a cut-and-raised portion 8m is formed in the extension portion 8e in order to more reliably position and prevent the terminal fitting 8 from coming off. The cut-and-raised portion 8m has a fixed end on the arm portion 8g side and is cut and raised on the fitting protruding portion 8d side. The free end 8m1 of the cut-and-raised portion 8m is oriented in the direction in which the terminal fitting 8 is separated from the insulating case 2 (the fitting projection 2d of the terminal fitting is formed in the fitting hole 2).
When it moves in the direction (non-insertion direction) opposite to the direction in which it is inserted into c, it cuts into the side wall surface 2e surrounding the substrate storage chamber 3. When the cut-and-raised portion 8m is formed in the extension 8e in this way,
A part of the substrate supporting rib 2a can be sandwiched by the extension portion 8e and the fitting projection 8d, and the cut-and-raised portion 8m also cuts into the side wall surface 2e surrounding the substrate storage chamber 3 so that the terminal fitting 8 is formed.
Of the terminal fitting 8 can be reliably prevented. The extension 8e is provided with a punched-out portion 8p for reinforcement so as to surround a hole 8n opened for forming the cut-and-raised portion 8m.

The arm portion 8g is used to obtain a spring force for pressing the contact portion 8a toward the plate-like portion 7c of the slider 7.
Actually, it is formed to be inclined as shown by a broken line in FIG. Angle θ0 between extension 8e and arm 8g
And by appropriately setting the width of the arm 8g,
The spring force can be set arbitrarily. If this spring force is too weak,
Insufficient contact between the contact portion 8a and the slider 7 causes electrical connection failure. Conversely, if this spring force is too strong,
The contact portion 8a may be worn out early. In this embodiment, when the contact portion 8a is in contact with the plate-like portion 7c of the slider 7, the angle θ0 between the arm portion 8g and the extension portion 8e is substantially 90 degrees (preferably 90 degrees ± 2 degrees). Degree). By doing so, not only can the wear of the contact portion be effectively prevented, but also the contact portion 8a and the slider 7 can be brought into good contact with each other.

Arm 8 of contact support 8b of terminal 8
g is arranged so as to cross over the variable resistor at an interval from the variable resistor VR1. In other words,
The terminal is arranged such that the terminal portion 8c is located radially outside the arc-shaped variable resistor VR1 and the arm portion 8g crosses over or passes over the variable resistor with a space between the arm portion 8g and the variable resistor VR1. A metal fitting 8 is arranged. The circuit board 1 of FIG. 2 will be described as an example.
“b” extends from one edge of the circuit board 1 as indicated by a broken line in FIG.

In this embodiment, the contact support 8 of the terminal 8
The operating member 4 is supported by the arm 7b of the slider 7 and the arm 7b of the slider 7. As a result, the contact point between the contact portion 8a of the contact support portion 8b of the terminal fitting 8 and the plate portion 7c of the slider 7 is located at a predetermined distance from the surface of the circuit board 1. According to this embodiment, the contact portion 8a of the terminal fitting 8 slides on the surface of the plate-like portion 7c of the slider 7 while drawing a sliding locus about the axis of the operation member 4.

The structure of the terminal fitting 8 and the slider 7 (shape and size of both) is such that the maximum potential difference between the terminal fitting 8 and the slider 7 and the variable resistors VR1 and VR2 is larger than the potential at which discharge occurs. It is configured to be small. In this embodiment,
The maximum potential difference may occur, for example, in FIG.
This is between the vicinity of the corner of the plate-like portion 7c of the slider 7 shown in (B) and the minimum potential portion of the variable resistor VR1.

On the wall surface 2f of the insulating case 2 which faces the surface of the circuit board 1 in the board storage chamber 3, it protrudes toward the surface of the circuit board 1, and the arm 8g of the contact supporting portion 8b of the terminal fitting 8 is interposed between the walls. A pair of projections 2g on which the base is disposed or fitted are integrally formed. These projections 2g prevent the arm 8g from swinging in the direction along the inner wall surface of the insulating case 2.

When the above structure is adopted, the variable resistor VR
The arrangement space of the variable resistance portion on the circuit board including the arrangement space of the terminal portion 8c of the terminal fitting 8 can be made smaller. This is for the following reasons. First, let L be the distance required between the terminal 8c of the terminal fitting 8 and the center of the arc of the variable resistor VR1, and let r be the radius of the arc of the variable resistor VR1. In this case, when the terminal portion 8c of the terminal fitting 8 is located radially inward of the variable resistor VR1, the length of the longest portion of the arrangement space for the variable resistor portion is L + r or more. This state is shown in FIG.
Only the dimensions are shown in (A). On the other hand, according to the present embodiment, since the contact supporting portion 8b of the terminal fitting 8 extends from the radial outside to the radial inside of the variable resistor VR1, the radius dimension of the arc of the variable resistor VR1. r
Is included in the dimension L described above. As a result, the length of the longest part of the arrangement space for the variable resistance
At least L may be set. As described above, according to the present invention, the space for arranging the variable resistance portion on the circuit board can be made smaller, so that the overall size of the circuit board can be made smaller.

In this embodiment, in order to minimize the size of the high-voltage variable resistor unit, all the two variable resistors VR1 and VR2 are shown in FIG.
And the output extraction structure shown in FIG. The overall shape of the high-voltage variable resistor unit of this embodiment is as shown in FIG. FIGS. 6A to 6C are a plan view, a front view, and a bottom view of the high-voltage variable resistor unit. In FIG. 5, the same members as those shown in FIGS. 1 to 4 are denoted by the same reference numerals as in FIGS. 5A and 5B, the operation member 4 located on the right side in the drawing is an operation member for varying the screen voltage, and the operation member located on the left side is an operation member for varying the focus voltage. FIG. 6 (C)
In FIG. 1, the back surface of the circuit board 1 is shown in an exposed state, but usually, a soft epoxy-based insulating resin is filled in the back surface side of the circuit board 1. After the insulating case 2 is attached to the flyback transformer, the capacitor housing room 9 and the substrate housing room 3 are filled with a hard epoxy-based insulating resin for transformer molding of the flyback transformer.

6 (B) and 6 (C), reference numeral 10 denotes a ground terminal, and reference numeral 11 denotes an input terminal. In the insulating case 2, a recess 12 is formed between the substrate storage chamber 3 and the capacitor storage chamber 9 so as to be filled with an insulating resin along the terminal portions 8 c of the two terminal fittings. Insulating case 2
A concave portion 13 is formed so as to surround the high-voltage side of the circuit board 1, that is, the periphery of the substrate portion 1a where the input terminal 11 (or the fixed resistor R) is disposed. The recess 13 is also filled with the mold resin of the flyback transformer.

Next, the circuit board 1 shown in FIG. 2A will be described. On the surface of the circuit board 1, an input electrode E1, a ground electrode E4, an arc-shaped first variable resistor VR1 for changing a screen voltage, and an arc-shaped second variable resistor VR2 for changing a focus voltage, A fixed resistor R is formed on the surface. The size of the periphery of the substrate portion 1a of the circuit board 1 on which the fixed resistor R is formed is smaller than that of the first substrate portion on which the variable resistors VR1 and VR2 are formed. As a result, as shown in FIG. 6C, a slit 15 is formed around the substrate portion 1a of the circuit board 1. Through this slit 15, a soft insulating resin enters the inside of the first portion 3a of the substrate storage chamber 3 shown in FIG. The first portion 3a of the substrate storage chamber 3 is partially filled with a soft insulating resin before storing the circuit board 1 in advance.

The first and second variable resistors VR1 and VR2
The circuit board 1 on which the two arc-shaped openings of the variable resistors VR1 and VR2 are arranged and the terminals of the two terminal fittings 8 are arranged
Are arranged so as to open toward the other side opposite to one side. And the first and second variable resistors VR
1 and VR2, the circuit board 1 is arranged such that the center of the arc of the variable resistor is along a virtual straight line CL extending in the longitudinal direction of the circuit board.
Is formed on the surface of. With this arrangement, the width and length of the circuit board 1 can be significantly reduced as compared with the conventional case. Specifically, the size of the circuit board can be reduced to ２ or less as a whole as compared with the related art.

As shown in FIG. 2B, the substrate storage chamber 3 of the insulating case 2 in which the circuit board 1 is stored is composed of the first portion 3a in which the substrate portion 1a of the circuit board 1 is stored and the circuit board 1
And a second portion 3b in which the first substrate portion is stored. Two projections 1 supporting the board portion 1a of the circuit board 1 are provided on the inner wall of the first portion 3a of the board storage chamber 3.
6 are formed integrally. On the inner wall of the second portion 3b of the substrate storage chamber 3, a substrate supporting rib 2a on which the peripheral portion of the substrate portion 1b of the circuit board 1 is placed is formed.

The steps of manufacturing the high-voltage variable resistor unit of this embodiment will be described. First, the insulating case 2 is placed on a jig with the opening of the insulating case 2 facing upward. Next, the operating member 4 having the slider 7 attached to the end in advance is attached to a predetermined position of the insulating case 2. Then, while the fitting projection 8d of the terminal fitting 8 is fitted and inserted into the fitting hole 2c of the insulating case 2, one of the board supporting ribs 2a of the insulating case 2 is placed between the fitting projection 8d and the extension 8e. Let me hold the part,
The terminal fitting 8 is attached to the insulating case 2. At this time, the contact portion 8a of the terminal fitting 8 is brought into contact with the plate-like portion 7c of the slider 7. Next, an adhesive is applied on the substrate supporting ribs 2a of the insulating case 2, the circuit board 1 is mounted thereon, and the adhesive is cured, and the circuit board 1 is moved to To join. In the present embodiment, a soft insulating resin is further filled on the back side of the circuit board 1 and cured to form an insulating resin layer. The high-voltage variable resistor unit manufactured in this way may be used as it is, but is often used by being attached to a flyback transformer case.

When oil such as grease is applied to the outer periphery of the shaft 4a of the operating member 4, the shaft of the operating member 4 is first insulated to prevent the oil from adhering to the slider 7. Case 2
It is preferable to attach the slider 7 to the operating member after the mounting.

In the above embodiment, the insulating resin layer is formed on the back side of the circuit board. However, without forming the insulating resin layer, the opening of the substrate storage chamber 3 of the insulating case 2 is closed with a lid member. The present invention can naturally be applied to a type of high-voltage variable resistor.

[0044]

According to the present invention, the arrangement space of the variable resistor portion on the circuit board including the fixed resistor for reducing the voltage applied to the plurality of variable resistors can be made smaller than before. In addition, the size of the high-voltage variable resistor unit can be reduced by reducing the size of the circuit board as a whole.

In particular, according to the present invention, the fitting projection of the terminal fitting bites into a wall surrounding the fitting hole formed in the insulating case to prevent the fitting projection from coming out of the fitting hole. Since the parts are provided integrally, it is possible to prevent the fitting protrusion of the terminal fitting from moving out of the fitting hole during the manufacturing process, and the terminal fitting is fixed to the board supporting rib in a proper posture. Can be positioned relative to each other, and the yield of products can be greatly improved.

[Brief description of the drawings]

FIG. 1A is a schematic sectional view of a main part of a variable resistor unit used in a high-voltage variable resistor unit of the present invention, and FIG.
FIG. 3 is a diagram of a main part viewed from the bottom side without a circuit board.

FIG. 2A is a plan view of a circuit board used in the high-voltage variable resistor unit of the present invention, and FIG. 2B is a view of an insulating case in which the circuit board of FIG. It is a bottom view.

3A is a front view of an operation member used in the embodiment of FIG. 1, FIG. 3B is a cross-sectional view taken along the line IIIB-IIIB of FIG. 3A,
(C) is a bottom view.

FIGS. 4A to 4C are a side view, a bottom view, and a front view of the slider used in the embodiment of FIG.

FIGS. 5A to 5D are a front view, a left side view, a right side view, and D of FIG. 5C of the terminal fitting used in the embodiment of FIG.
FIG. 4 is a sectional view taken along line D.

FIGS. 6A to 6C are a plan view, a front view, and a bottom view of a high-voltage variable resistor unit according to an embodiment of the present invention.

FIG. 7 is a plan view of a circuit board used for a conventional high-voltage variable resistor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Circuit board 2 Insulating case 2a Substrate supporting rib 2c Fitting hole 3 Substrate storage room 4 Operating member 5 Vertical hole 6 Spacer 7 Slider 8 Terminal fitting (connection means) 8a Contact 8d Fitting projection 8g Arm part 8k protrusion (bite part)

Claims (8)

[Claims] A circuit board having a resistor pattern including a variable resistor formed on a surface thereof; a board accommodating chamber in which the circuit board is housed; and a board supporting rib to which the circuit board is bonded using an adhesive. An insulating case made of an insulating resin having: a slider disposed between the surface of the circuit board and the insulating case to slide on the variable resistor; and an operation of operating the slider. An operating member having a shaft; and a terminal fitting electrically connected to the slider. The slider includes a supported portion supported by the operating member. A contact portion that contacts the supported portion of the slider to allow rotation of the slider, a terminal portion, and a contact support portion that connects the contact portion and the terminal portion; The contact point between the terminal fitting and the contact portion is moved from the surface of the circuit board by the operation. The terminal fitting and the slider are configured so as to be spaced from each other on the material side, and the contact support portion of the terminal fitting is fitted into a fitting hole formed in the substrate supporting rib. A projection for fitting, an arm having a spring force for providing the contact portion at the tip and pressing the contact portion toward the supported portion of the slider;
A wall portion surrounding the fitting hole formed in the insulating case, the fitting portion having an intermediate portion positioned between the fitting protrusion and the arm portion; A variable resistor unit for high voltage, wherein a biting portion for preventing the fitting protrusion from coming out of the fitting hole by biting into the hole is integrally provided. 2. A circuit board having a resistor pattern including a plurality of variable resistors formed on a surface thereof; an insulating case having a board storage chamber for housing the circuit board; A plurality of sliders disposed between a case and sliding on the plurality of variable resistors, respectively; a plurality of operation members having an operation shaft for operating the plurality of sliders; A plurality of terminal fittings electrically connected to the moving element, wherein the plurality of sliders each include a supported portion supported by the corresponding operating member; The terminal fitting and the slider are configured such that contact points between the supported portion and the contact portions of the terminal fitting are spaced from the surface of the circuit board toward the operation member, and The terminal fitting of A contact portion that contacts the supported portion of the slider, a terminal portion, and a contact support portion that connects the contact portion and the terminal portion, and the contact support of one or more terminal fittings The part includes a fitting projection fitted into a fitting hole formed in the substrate supporting rib, an extension extending along a side wall surface surrounding the substrate storage chamber, the fitting projection and the extension. A connecting portion for connecting the first and second portions, and a substrate having the contact portion at a tip thereof and an arm portion having a spring force for pressing the contact portion toward the supported portion of the slider. A groove portion into which the connecting portion of the contact support portion is fitted so as not to hinder the joining of the circuit board; and the fitting protrusion of the terminal fitting is formed on the insulating case. The fitting protrusion projects into the wall surrounding the fitting hole, A variable resistor unit for high voltage, wherein a biting portion for preventing the escape from the fitting hole is provided integrally. 3. The fitting projecting portion has a flat plate shape, and the biting portion projects from a pair of edges located in the width direction of the fitting projecting portion to at least one pair projecting outward in the width direction. A pair of protrusions, each of which has a tapered portion whose width dimension increases as the distance from the distal end of the fitting protrusion inserted into the fitting hole increases, and a tapered portion as viewed from the distal end. 3. The high-voltage variable resistor unit according to claim 1, further comprising a biting corner formed on the rear side. 4. The terminal of the terminal fitting is located radially outside the arc-shaped variable resistor, and the arm of the contact support is spaced from the variable resistor by a distance. 3. The high-voltage variable resistor unit according to claim 1, wherein the terminal fitting is disposed so as to cross over the variable resistor. 5. A cut-and-raised portion is formed in the extension portion of the terminal fitting, and the cut-and-raised portion has a fixed end on the arm portion side and is cut and raised on the fitting projecting portion side. The free end of the cut-and-raised portion has a shape that cuts into the side wall surface surrounding the substrate storage chamber when the terminal fitting moves in a direction away from the insulating case. The variable resistor unit for high voltage according to 1. 6. A pair of protrusions protruding toward a surface of the circuit board from a wall surface of the insulating case facing the surface of the circuit board in the board storage chamber of the insulating case. The high-voltage variable resistor unit according to claim 1, wherein a base of the arm portion of the contact support portion is fitted between the pair of protrusions. 7. An insulating resin material having a circuit board having a circuit pattern formed on a surface thereof, a board housing chamber for housing the circuit board, and a board supporting rib to which the circuit board is bonded using an adhesive. An electrically conductive member disposed in the substrate storage chamber and electrically connected to the circuit pattern; and a terminal fitting electrically connected to the conductive member. A contact portion for contacting a member, a terminal portion, and a contact support portion for connecting the contact portion and the terminal portion, wherein the contact support portion of the terminal fitting has a fitting hole formed in the substrate supporting rib; A fitting protrusion fitted to the arm, an arm portion having the contact portion at the tip and having a spring force for pressing the contact portion toward the conductive member, and between the fitting protrusion and the arm portion. And an intermediate part located at The fitting protrusion of the terminal fitting has a biting portion that cuts into a wall surrounding the fitting hole formed in the insulating case to prevent the fitting protrusion from coming out of the fitting hole. An electric component for high voltage, which is provided integrally. 8. The fitting projecting portion has a flat plate shape, and the biting portion projects from the pair of edges positioned in the width direction of the fitting projecting portion outwardly in the width direction. A pair of protrusions, each of which has a tapered portion whose width dimension increases as the distance from the distal end of the fitting protrusion inserted into the fitting hole increases, and a tapered portion as viewed from the distal end. 2. The high-voltage electrical component according to claim 1, further comprising a biting corner formed on the rear side.