JPH1041109A - Variable resistor for high voltage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a variable resistor for high voltage which prevents outflow of housing failure of a connecting terminal. SOLUTION: A cannecting terminal 7 is formed by punching it out from a plate metal, and it has an almost rectangularshaped lead wire connecting part 7a in which three holding pieces 7c extending from the edge part to the center part are formed, a spring part 7b which is formed connecting to the center part of one end of the lead wire connecting part 7a and bend-worked into a bend shape, and protruded parts 7d and 7d which are an each side of the spring part 7b of the lead wire connecting part 7a and extended in the formation direction of the spring part 7b. The protruded part 7d is farmed into the length almost reaching the position of an electrode contacting part of the spring part 7b so as not to prevent the spring part 7b from being pressurized to contact to an electrode under the condition where the connecting terminal 7 is press-fixed to an insulating substrate.

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 used for adjusting a focus voltage and a screen voltage of a television receiver or the like.

[0002]

2. Description of the Related Art Conventionally, as a high-voltage variable resistor of this type, it has been possible to connect an electrode formed on the surface of an insulating substrate to a lead wire inserted from outside without soldering. 6 and FIG. FIG. 6 is a sectional view of a main part showing an output connection part of the high-voltage variable resistor, and FIG. 7 is an exploded perspective view of the output connection part.

As shown in FIGS. 6 and 7, this high-voltage variable resistor has an insulating substrate 2 adhered and fixed to a step formed on an inner peripheral surface of an insulating case 1 having an open surface.
An epoxy resin 3 is cast on the opening side of the insulating substrate 2 on the back surface (the upper surface in FIGS. 6 and 7) of the insulating substrate 2.

[0004] The insulating case 1 is provided with a lead wire holding cylinder 1b, and a connection terminal housing 6 is provided in the insulating case 1 at the base of the lead wire holding cylinder 1b. The connection terminal 7 is housed in contact with and conductive with the terminal electrode 2a formed on the surface of the second terminal 2. A terminal holding groove 6 a for inserting and holding the connection terminal 7 in a predetermined direction is provided at the bottom of the connection terminal housing 6. Further, a terminal holding rib or the like may be provided instead of the terminal holding groove 6a.

[0005] The connection terminal 7 is formed by stamping a plate-shaped metal, and has a substantially square lead wire connection portion 7a having three holding pieces 7c extending from the edge to the center, and a lead wire connection portion. And a spring portion 7b formed to be connected to one end of the end portion 7a and bent into a curved shape.

The connection terminal 7 has a lower portion of the lead wire connection portion 7a and a terminal holding groove 6a provided on the bottom surface of the connection terminal storage portion 6.
Then, the insulating substrate 2 is pressed against the step portion of the insulating case 1 and bonded and fixed, so that a part of the spring portion 7b comes into pressure contact with the terminal electrode 2a of the insulating substrate 2 and contacts the insulating substrate 2. While being held down, it is stored and fixed in the connection terminal storage section 6.

An output lead wire for taking out a focus voltage or a screen voltage is inserted into the lead wire holding cylinder 1b, and the inserted lead wire has a core piece 7
c and is contacted and connected to the connection terminal 7 so that it does not come off the lead wire holding cylinder 1b. Generally, the insertion of the lead wire is performed when the high-voltage variable resistor is incorporated into a device such as a television receiver, that is, after the high-voltage variable resistor is completed.

[0008]

However, in the above-mentioned conventional high-voltage variable resistor, the connection terminal 7 is accidentally inserted obliquely into the connection terminal housing 6, or the connection terminal 7 is connected to the connection terminal. When the connection terminal 7 is placed obliquely after being inserted into the housing 6 due to vibration or the like, as shown in FIG. 8, the lead wire connection portion 7a of the connection terminal 7 comes off from the terminal holding groove 6a, and In some cases, the connection terminal 6 is placed on the bottom surface of the storage portion 6 and is pressed against the insulating substrate 2 in this state, and is stored and fixed in the connection terminal storage portion 6. That is, in the conventional connection terminal 7, the spring portion 7 b has a spring property even if it is separated from the terminal holding groove 6 a and the spring portion 7 b is extremely protruded from the mounting surface of the insulating substrate 2. Since the insulating substrate 2 is easily deformed, the fixing of the insulating substrate 2 is performed without any problem, and it is not possible to find a storage failure of the connection terminal 7 (a displacement error, a tilt failure, a deformation failure of the spring portion 7b, and the like). There is a problem that such defective products flow out.

In some cases, the internal shape of the connection terminal housing is changed in order to prevent the above-described connection terminal storage failure. However, in this case, the structure of the connection terminal housing is complicated, and the insulating case is insulated. However, there is a problem that the mold cost and the molding cost of the insulating case are increased.

SUMMARY OF THE INVENTION An object of the present invention is to provide a high-voltage variable resistor capable of preventing outflow of connection terminal storage failure regardless of the shape of the connection terminal storage section.

[0011]

In order to achieve the above object, the present invention provides an insulating case having a one-sided opening having a connection terminal accommodating portion formed thereon, and a film resistor and an electrode formed on the surface. Soldering the insulating substrate housed in the case, the rotating shaft on which the slider is mounted and supported by the insulating case, and the electrode and the input / output lead wire housed in the connection terminal housing. A high-voltage variable resistor, comprising: a connection terminal, a connection terminal provided with a holding piece for holding an input / output lead wire inserted from the outside; A spring portion formed continuously with one end of the wire connection portion and bent into a curved shape to press and contact the electrode; and a spring portion formed continuously with the lead wire connection portion. Projection that projects a predetermined length in the direction And it is characterized in that it has and.

According to the above configuration, since the connection terminal is provided with the projection in the direction in which the spring portion is formed, when the connection terminal is placed obliquely in a predetermined direction or position. The insulating substrate is blocked by the protruding portion, so that the insulating substrate cannot be pressed and adhered to the step of the insulating case, and the insulating substrate is in a floating state or an inclined state. Therefore, when the insulating substrate is bonded and fixed to the insulating case or after the insulating substrate is fixed, the connection terminal storage failure can be easily found as the insulation substrate fixing failure, and the connection terminal storage failure can be reliably prevented from flowing out. it can.

The protrusion is formed to have a length slightly shorter than the position of the electrode contact portion of the spring portion.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A high voltage variable resistor according to one embodiment of the present invention will be described below with reference to FIGS. FIG.
1A is a side sectional view of a high-voltage variable resistor, FIG. 1B is a front view of the high-voltage variable resistor, and FIG. 2 is a cross-sectional view of a main part of an output connection portion of the high-voltage variable resistor. 3 is a perspective view of the connection terminal. In the following drawings, the same reference numerals are given to those having the same or the same functions as the conventional example.

As shown in FIGS. 1 to 3, a high-voltage variable resistor according to this embodiment has an insulating substrate 2 made of alumina or the like on a step formed on an inner peripheral surface of an insulating case 1 having a single-sided opening. Are attached and fixed to each other, and rotating shafts 5, 5 each having a slider 4 attached thereto are supported on cylindrical bearings 1 a, 1 a provided on the front surface facing the opening surface of the insulating case 1. A ground terminal 8 and a high-voltage input terminal 9 are led out on the back side of the substrate, and an epoxy resin 3 is cast on the opening side of the insulating case 1 and on the back side of the insulating substrate 2.

The insulating case 1 is integrally formed with lead wire holding cylinders 1b and 1b for inserting and holding output lead wires for taking out a focus voltage and a screen voltage, and at the root of each lead wire holding tube 1b. Connection terminal housings 6 are provided surrounded by isolation walls, and connection terminals 7 are housed and fixed in each of the connection terminal housings 6 in contact with and in contact with terminal electrodes 2 a formed on the surface of the insulating substrate 2. A terminal holding groove 6 a for inserting and holding the connection terminal 7 in a predetermined direction is provided at the bottom of the connection terminal housing 6.

Although not shown, on the surface of the insulating substrate 2, a film resistor including a variable resistor for focus voltage and a variable resistor for screen voltage, in addition to the output terminal electrode 2a, An input terminal electrode, a ground terminal electrode, and the like, which are electrically connected to the body, are formed. Each of the sliders 3 is arranged such that one end thereof slides on a corresponding arc-shaped variable resistance portion.

The connection terminal 7 is formed by stamping a flat metal plate, and has a substantially rectangular lead wire connection portion 7a having three holding pieces 7c extending from the edge to the center, and a lead wire connection portion. A spring portion 7b formed to be connected to a central portion on one end side of the end portion 7a and bent into a curved shape;
In addition, there are protruding portions 7d, 7d on both sides of the spring portion 7b and extending in the forming direction of the spring portion 7b. This projection 7
d is formed to have a slightly shorter length than the position of the electrode contact portion of the spring portion 7b so that the contact of the spring portion 7b with the electrode is not hindered in a state where the connection terminal 7 is pressed and fixed to the insulating substrate 2. Have been.

The connection terminal 7 has a lower portion of the lead wire connection portion 7a and a terminal holding groove 6a provided on the bottom surface of the connection terminal storage portion 6.
Then, the insulating substrate 2 is pressed against the step portion of the insulating case 1 and bonded and fixed, so that a part of the spring portion 7b comes into pressure contact with the terminal electrode 2a of the insulating substrate 2 and contacts the insulating substrate 2. While being held down, it is stored and fixed in the connection terminal storage section 6.

As described above, the high-voltage variable resistor according to the present embodiment is characterized in that the protrusions 7d, 7d are provided on the lead wire connecting portion 7a of the connection terminal 7 in the same direction as the direction in which the spring portion 7b is formed. The other configuration is the same as that described in the conventional example.

Next, referring to FIG. 4, the operation and effect of the projection 7d provided on the connection terminal 7 will be described. FIG. 4 is a cross-sectional view of the output connection portion in a state where the connection terminal is placed obliquely. The connection terminal 7 is erroneously inserted obliquely into the connection terminal storage portion 6 or the connection terminal 7 is displaced obliquely due to vibration or the like after the insertion, and the spring portion 7 b projects extremely beyond the mounting surface of the insulating substrate 2. In this state, the insulating substrate 2 is blocked by the projections 7d, 7d, and cannot be pressed and adhered to the step of the insulating case 1. As shown in FIG. The insulating substrate 2 is in a floating state or an inclined state.

In other words, when the connection terminal is not properly stored, the spring portion is easily deformed in the conventional connection terminal, so that the insulating substrate is bonded and fixed without any problem. In 7, the protrusion 7d is not deformed by the pressing at the time of bonding and fixing the insulating substrate 2, and a storage failure of the connection terminal 7 can be easily found as a fixing failure of the insulating substrate 2. Therefore, in the high-voltage variable resistor according to the present embodiment, when the insulating substrate is bonded and fixed to the insulating case or after the insulating substrate is fixed, it is possible to easily find the storage terminal storage defect. Outflow of defects can be reliably prevented.

That is, the shape (width) and the number of the protrusions 7d are set so as not to be deformed by the pressing at the time of bonding and fixing the insulating substrate 2. For example, as shown in FIG. 5, if both side portions of the lead wire connection portion 7a of the connection terminal 7 are bent, and the bent side portions are extended to provide projections 7d, 7d. The mechanical strength of the projection 7d can be increased, and it is possible to cope with even greater pressing.

[0024]

As described above, according to the high-voltage variable resistor according to the present invention, since the connection terminal is provided with the projection in the direction in which the spring portion is formed, the connection terminal can be moved in a predetermined direction. If the insulating substrate is placed obliquely out of position, the insulating substrate will be blocked by the protrusions, and the insulating substrate will not be able to be pressed and adhered to the step of the insulating case, and the insulating substrate will be in a floating or inclined state Becomes Therefore, when the insulating substrate is adhered and fixed to the insulating case or after the insulating substrate is fixed, the storage failure of the connection terminal can be easily found as the failure of fixing the insulation substrate. Can be prevented.

[Brief description of the drawings]

FIG. 1A is a side sectional view of a high-voltage variable resistor according to an embodiment of the present invention, and FIG. 1B is a front view.

FIG. 2 is a cross-sectional view showing an output connection portion of the high-voltage variable resistor according to one embodiment of the present invention.

FIG. 3 is a perspective view of a connection terminal according to one embodiment of the present invention.

FIG. 4 is a cross-sectional view of an output connection portion in a state where connection terminals according to one embodiment of the present invention are placed obliquely.

FIG. 5 is a perspective view of a connection terminal according to another embodiment of the present invention.

FIG. 6 is a cross-sectional view of an output connection portion of a conventional high-voltage variable resistor.

FIG. 7 is an exploded perspective view showing an output connection portion of a conventional high-voltage variable resistor.

FIG. 8 is a cross-sectional view of an output connection portion in a state where connection terminals of a conventional high-voltage variable resistor are placed obliquely.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulation case 1b Lead wire holding cylinder 2 Insulating board 2a Terminal electrode 6 Connection terminal storage part 7 Connection terminal 7a Lead wire connection part 7b Spring part 7c Clamping piece 7d Projection part

Claims (1)

[Claims] An insulating case having an open surface on one side in which a connection terminal housing portion is formed; an insulating substrate housed in the insulating case having a film resistor and an electrode formed on a surface thereof; A high-voltage variable resistor including a rotating shaft supported by an insulating case and a connection terminal housed in the connection terminal housing and connecting the electrode and an input / output lead wire without soldering. The connection terminal is formed so as to be connected to a lead wire connection portion provided with a holding piece for holding an input / output lead wire inserted from outside, and one end of the lead wire connection portion, It has a spring portion bent into a curved shape that is in press contact with the electrode, and a projection portion formed continuously with the lead wire connection portion and protruding a predetermined length in a direction in which the spring portion is formed. A high-voltage variable resistor, characterized in that: