JPH0963814A - Variable resistor for high tension - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable surely holding a connection terminal in a connection terminal accommodating part without pinching the tip of a spring part of the connection terminal between a case and a board. SOLUTION: A connection terminal has a spring part 7b which is worked in a bent form. The tip part of the spring part 7b is bent inward more than the inner peripheral surface of a connection terminal accommodating part (a spring accommodating part 6c) placed in a case 1.

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 in a television receiver or the like.

[0002]

2. Description of the Related Art Conventionally, an electrode formed on a substrate and a conductive rubber are used as a high-voltage variable resistor in which lead wires for input and output are connected without soldering and the lead wires can be attached and detached. It is known that a contact wire is made conductive, a part of a connection terminal is inserted into a conductive rubber, and a lead wire is inserted into the connection terminal. However, this type of high-voltage variable resistor requires conductive rubber in addition to the connection terminals, increasing the number of parts, and the use of conductive rubber increases the number of connection points and makes connection terminal installation work complicated. There is a problem such as

Therefore, the applicant has provided a spring portion on the connection terminal, and presses a part of the spring portion against the electrode formed on the substrate so that the electrode and the lead wire can be connected only by the connection terminal. For example, a high voltage variable resistor having a structure as shown in FIGS. 6 to 8 is proposed (Japanese Patent Application No. 06-260527). 6 is a side sectional view of the high-voltage variable resistor, FIG. 7 is an exploded perspective view showing a holding structure of the connection terminal, and FIG. 8 is a plan view of the connection terminal housing viewed from the opening surface side of the case.

As shown in FIG. 6, this high-voltage variable resistor includes a substrate 2 made of ceramics such as alumina on a step portion formed on the inner peripheral surface of a case 1 made of synthetic resin having an opening on one side.
Are fixed by adhesion, and the rotary shafts 5, 5 having the sliders 4 mounted thereon are borne by the cylindrical bearing portions 1a, 1a provided in the portion facing the opening surface of the case 1, and the opening surface of the case 1 is The epoxy resin 3 is molded on the back surface (upper surface in FIG. 6) of the substrate 2.

A lead wire holding cylinder 1b is provided on the side wall of the case 1.
However, the connection terminal accommodating portion 6 is integrally formed in the inner corner portion corresponding to the lead wire holding cylinder 1b, and the connection terminal accommodating portion 6 comes into contact with the terminal electrode formed on the substrate 2 to establish the connection terminal 7. The lead wire 8 for output is inserted into the lead wire holding cylinder 1b, and the lead wire 8 is connected to the connection terminal 7. Focus voltage, screen voltage, and the like are output from the lead wire 8.

As enlargedly shown in FIGS. 7 and 8, the connection terminal 7 is formed by punching out a plate-shaped metal, and has a substantially square shape with three connection pieces 7c extending from the edge portion to the central portion. The lead wire connecting portion 7a and the spring portion 7b which is formed by being continuously formed at one end of the lead wire connecting portion 7a and which is bent into a curved shape.

Each connecting piece 7c is formed by bending it in the insertion direction of the lead wire 8 at a predetermined position, and the spring portion 7b has a predetermined width.
The lead wire connecting portion 7a is formed so as to project toward the substrate 2 side at the center of one end thereof, is curved in the lead wire insertion direction so as to have a spring property, and is formed so that its tip extends to the lead wire insertion side. The spring portion 7b is formed to be longer in order to improve the spring characteristics and obtain the required spring property.

The connection terminal accommodating portion 6 comprises a terminal retaining groove 6a provided on the bottom side of the case 1, a connection piece accommodating groove 6b, and a spring accommodating portion 6c having a substantially circular cross section provided on the opening side. The single storage groove 6b is also extended to the spring storage portion 6c,
The intersection of the opening surface and the inner peripheral surface of the spring accommodating portion 6c is formed at a right angle. The opening surface of the connection terminal housing portion 6 is formed in the same plane as the step portion formed on the inner peripheral surface of the case 1.

In the connecting terminal 7, the lead wire connecting portion 7a is held in the terminal holding groove 6a of the connecting terminal housing portion 6, and the spring portion 7b.
Is contacted with the terminal electrode of the substrate 2 and is pressed against the substrate 2, and is housed and fixed in the connection terminal housing portion 6. In the lead wire 8 inserted from the lead wire holding cylinder 1b, the core wire 8a is sandwiched between the connection pieces 7c and the connection terminal 7 is inserted.
Connected to

The surface of the substrate 2 (lower surface in FIG. 6)
Although not shown, an output terminal electrode, an input terminal electrode to which a high voltage is input, a ground terminal electrode, etc. are formed, and an arc-shaped variable resistance portion is provided between the input terminal electrode and the ground terminal electrode. A patterned film resistor is formed.
Although not shown, a lead terminal or lead wire for grounding and high voltage input is connected to the terminal electrode by soldering or conductive rubber, and is drawn out from the opening side of the case 1.

[0011]

However, in the above-mentioned variable resistor for high voltage, the thickness of the connection terminal 7, the clearance of the terminal holding groove 6a, the dimensional variation of the connection terminal 7,
As shown in FIG. 9, the tip of the spring portion 7b of the connection terminal 7 may be raised to the opening surface of the connection terminal storage portion 6 (spring storage portion 6c) due to variations in insertion work. That is, when the board 2 is fitted into the case 1 after the connection terminal 7 is inserted into the connection terminal housing portion 6, the tip of the spring portion 7b is sandwiched between the case 1 and the board 2 and the connection terminal 7 is deformed. Sometimes occurs, or the spring portion 7b is bonded and fixed in a state of being sandwiched between the case 1 and the substrate 2.

Therefore, an object of the present invention is to solve the above problems of the high-voltage variable resistor, and to secure the connection terminal without the tip of the spring portion of the connection terminal being sandwiched between the case and the substrate. Another object of the present invention is to provide a high voltage variable resistor that can be held in a connection terminal housing.

[0013]

In order to achieve the above object, the invention according to claim 1 provides a case having a one-sided opening in which a connection terminal accommodating portion is formed, and a case in which a film resistor and an electrode are formed. The substrate housed in the housing, the rotary shaft to which the slider is attached and borne by the case, and the housing accommodated in the connection terminal housing, connect the electrode or the film resistor to the input / output lead wire. In a high-voltage variable resistor including a connection terminal, the connection terminal has a spring portion bent into a curved shape, and a tip of the spring portion faces inward from an inner peripheral surface of the connection terminal housing portion. It is characterized by being bent so that

The invention according to claim 2 is the invention according to claim 1, characterized in that the opening of the connection terminal accommodating portion is chamfered.

According to the above structure, the connection terminal is held in the connection terminal accommodating portion without the tip of the spring portion being sandwiched between the case and the substrate.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the drawings showing embodiments thereof. In the figure, the same or corresponding parts and those having the same functions as those in the conventional example are designated by the same reference numerals.

The structure of the high-voltage variable resistor according to the first embodiment of the present invention is shown in FIGS. FIG. 1 is a perspective view of a connection terminal, and FIG. 2 is a sectional view showing a holding portion of the connection terminal.

As shown in FIGS. 1 and 2, in the high voltage variable resistor of this embodiment, the tip of the spring portion 7b of the connection terminal 7 is located at the inner peripheral surface of the connection terminal storage portion 6 (spring storage portion 6c). Is also bent so as to face inward. That is, the bent portion 7 d is provided at the tip of the spring portion 7 b, and the tip of the bent portion 7 d is formed so as to be directed toward the inside of the connection terminal housing 6 from the inner peripheral surface of the connection terminal housing 6. ing. The configuration other than the shape of the spring portion 7b of the connection terminal 7 is the same as that described in the related art, and the description thereof is omitted.

The connecting terminal 7 is the lead wire connecting portion 7
After holding a in the terminal holding groove 6a of the connection terminal housing portion 6,
The board 2 is fitted in and bonded to the case 1 so that a part of the spring portion 7b contacts the terminal electrode of the board 2, and is held in the connection terminal housing portion 6.

In this structure, the tip of the spring portion 7b is bent inward from the inner peripheral surface of the spring accommodating portion 6c,
Since the bent portion 7d is provided, even if the connection terminal 7 is inclined and inserted due to the thickness of the connection terminal 7 and the clearance of the terminal holding groove 6a, the variation in the dimensions of the connection terminal 7, the variation in the insertion work, etc. The connection terminal 7 is reliably stored in the connection terminal storage portion 6 without the spring portion 7b of the terminal 7 rising to the opening surface of the connection terminal storage portion 6 (spring storage portion 6c). That is, when the board 2 is fitted into the case 1 after the connection terminal 7 is inserted into the connection terminal housing portion 6, the tip of the spring portion 7b does not get caught between the case 1 and the board 2, and the case 1 and the board 2 Can be securely bonded and fixed.

Further, even if the bent portion 7d is raised to the opening surface of the connection terminal accommodating portion 6, the trouble can be easily judged from the mounting state of the substrate 2.

Next, the structure of the high voltage variable resistor according to the second embodiment of the present invention is shown in FIGS. FIG. 3 is a plan view of the connection terminal accommodating portion, and FIG. 4 is a cross-sectional view showing the connection terminal holding portion.

As shown in FIGS. 3 and 4, in the high-voltage variable resistor of this embodiment, the intersection of the opening surface of the connection terminal housing 6 of the case 1 and the inner peripheral surface is chamfered over the entire circumference. Has been done. That is, a chamfered surface 6d inclined to the opening surface and the inner peripheral surface of the connection terminal housing portion 6 is formed at the intersection.
The configuration other than the shape of the connection terminal accommodating portion is the same as that described in the first embodiment, and a description thereof will be omitted.

In this structure, the tip of the spring portion 7b is bent inward from the inner peripheral surface of the spring accommodating portion 6c, and the opening of the connecting terminal accommodating portion 6 is chamfered, so that the connecting terminal is formed. Even if 7 is inserted at an angle, the connection terminal 7 can be reliably stored in the connection terminal storage portion 6 without the spring portion 7b of the connection terminal 7 rising to the opening surface of the connection terminal storage portion 6. That is, when the board 2 is fitted into the case 1 after the connection terminal 7 is inserted into the connection terminal housing portion 6, the tip of the spring portion 7b does not get caught between the case 1 and the board 2, and the case 1 and the board 2 Can be securely bonded and fixed.

In the above embodiment, the chamfered surface is flat, but the chamfered surface 6d may be formed into a curved surface as shown in FIG. Further, the chamfered portion need not be the entire circumference of the intersection of the opening surface and the inner peripheral surface, and may be chamfered only at the portion corresponding to the bent portion 7d of the spring portion 7b.

Further, in each of the above embodiments, the spring accommodating portion has a circular cross section, but the spring accommodating portion 6c may have a substantially rectangular cross section, and the connecting piece accommodating groove 6b may have the same shape as the above embodiment. It is not limited to the example. Further, when the connection piece storage groove 6b is smaller than the outer diameter of the spring storage portion 6c, the connection piece storage groove 6b is not formed in the spring storage portion 6c.

[0027]

As described above, according to the high-voltage variable resistor of the present invention, the tip of the spring portion of the connection terminal is bent inward from the inner peripheral surface of the spring accommodating portion. Since the bent part is provided, even if the connection terminal is inserted at an angle, the spring of the connection terminal does not rise to the opening surface of the connection terminal storage part, and the connection terminal can be securely placed in the connection terminal storage part. It is stored.

Further, in addition to using the connection terminal in which the bent portion is provided at the tip of the spring portion, the opening of the connection terminal accommodating portion is chamfered so that the tip of the spring portion is opened in the connection terminal accommodating portion. It is possible to more reliably prevent the surface from climbing.

That is, when the board 2 is fitted into the case 1 after the connection terminal 7 is inserted into the connection terminal housing portion 6, the spring portion 7 is inserted.
The tip of b is not caught between the case 1 and the substrate 2,
The case 1 and the substrate 2 can be securely bonded and fixed.
Therefore, the terminal insertion work of the connection terminal can be easily performed, the connection terminal can be surely brought into contact with the terminal electrode of the substrate, and the case and the substrate can be reliably adhered and fixed.

[Brief description of drawings]

FIG. 1 is a perspective view of a connection terminal of a high voltage variable resistor according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a holding portion of a connection terminal of the high voltage variable resistor according to the first embodiment of the present invention.

FIG. 3 is a plan view of a connection terminal accommodating portion viewed from a case opening surface side of a high voltage variable resistor according to a second embodiment of the present invention.

FIG. 4 is a sectional view showing a holding portion of a connection terminal of a high voltage variable resistor according to a second embodiment of the present invention.

FIG. 5 is a sectional view showing another embodiment of the connection terminal housing of the present invention.

FIG. 6 is a side sectional view of a conventional high voltage variable resistor.

FIG. 7 is a broken exploded perspective view showing a holding structure of a connection terminal of a conventional high voltage variable resistor.

FIG. 8 is a plan view of a connection terminal accommodating portion viewed from the case opening surface side of a conventional high voltage variable resistor.

FIG. 9 is a cross-sectional view showing a holding portion of a connection terminal of a conventional high voltage variable resistor.

[Explanation of symbols]

 1 Case 1a Bearing part 1b Lead wire holding cylinder 2 Board 3 Resin 4 Slider 5 Rotating shaft 6 Connection terminal storage part 6a Terminal holding groove 6b Connection piece storage groove 6c Spring storage part 6d Chamfered surface 7 Connection terminal 7a Lead wire connection part 7b Spring part 7c Connection piece 7d Bent part 8 Lead wire 8a Core wire

Claims (2)

[Claims] 1. A case having a one-sided opening in which a connection terminal accommodating portion is formed, a substrate in which a film resistor and an electrode are formed and accommodated in the case, and a slider are attached and supported by the case. A variable resistor for high voltage, comprising: a rotating shaft; and a connection terminal that is housed in the connection terminal housing and that connects the electrode or the film resistor and an input / output lead wire, wherein the connection terminal is curved. Has a spring part that is bent into a shape,
A high-voltage variable resistor, wherein the tip of the spring portion is bent so as to be inward from the inner peripheral surface of the connection terminal housing portion. 2. The high voltage variable resistor according to claim 1, wherein at least a part of the opening of the connection terminal housing is chamfered.