JP3036410B2 - High-voltage variable resistor - Google Patents

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 a television receiver or the like.

[0002]

2. Description of the Related Art Conventionally, as a high-voltage variable resistor which enables connection of input / output lead wires without soldering,
The electrode formed on the substrate and the conductive rubber are brought into contact and conduction,
There is known a configuration in which a part of a connection terminal is inserted into conductive rubber and a lead wire is inserted into the connection terminal. However, this type of high-voltage variable resistor has a problem that the use of conductive rubber increases the number of components, increases the number of connection points, and lowers connection reliability.

[0003] In view of the above, the present applicant has provided a spring portion on the connection terminal, and pressed a part of the spring portion against an electrode formed on the substrate, so that the connection between the electrode and the lead wire was made only by the connection terminal. For example, a high-voltage variable resistor having a structure as shown in FIGS. 5 to 7 has been proposed (Japanese Patent Application No. 06-260527). 5 is a sectional side view of the high-voltage variable resistor, FIG. 6 is an exploded perspective view showing a connection terminal holding structure, and FIG. 7 is a cross-sectional view showing a connection terminal holding portion.

As shown in FIG. 5, this high-voltage variable resistor has a substrate 2 made of ceramic such as alumina on a step formed on the inner peripheral surface of a synthetic resin case 1 having an open surface.
Are fixed to each other, and rotating shafts 5, 5 each having a slider 4 mounted thereon are mounted on cylindrical bearings 1 a, 1 a provided at portions facing the opening surface of the case 1. The epoxy resin 3 is molded on the back surface (upper surface in FIG. 5) of the substrate 2.

A lead wire holding cylinder 1b is provided on the side wall of the case 1.
However, a connection terminal housing 6 is integrally formed at the inner corner corresponding to the lead wire holding cylinder 1b, and the connection terminal housing 6 is brought into contact with a terminal electrode formed on the substrate 2 so that the connection terminal 7 is in contact therewith. The lead wire 8 for output is inserted into the stored lead wire holding cylinder 1b, and the lead wire 8 is connected to the connection terminal 7. A focus voltage, a screen voltage, and the like are output from the lead wire 8.

As shown in FIGS. 6 and 7 in an enlarged manner, the connection terminal 7 is formed by stamping a flat metal plate, and has a substantially square shape formed with three connection pieces 7c extending from the edge to the center. The lead wire connecting portion 7a has a shape and a spring portion 7b which is formed continuously with one end of the lead wire connecting portion 7a and is bent in a curved shape.

Each connecting piece 7c is bent at a predetermined location in the direction of inserting the lead wire 8, and a spring portion 7b is formed at the center of one end of the lead wire connecting portion 7a so as to protrude toward the substrate 2.
It is curved in the lead wire insertion direction so as to have a spring property, and is formed so that its tip extends toward the lead wire insertion side. The spring portion 7b is formed with a predetermined width in order to obtain a required spring property. The connection terminals 7 are randomly stored and stored in a packing bag or a part case in units of hundreds to thousands.

The connection terminal housing 6 comprises a terminal holding groove 6a provided on the bottom side of the case 1, a connection piece housing groove 6b, and a spring housing 6c having a substantially circular cross section provided on the opening side. The one-side storage groove 6b also extends to the spring storage portion 6c. The opening surface of the connection terminal housing 6 is formed on the same plane as the step formed on the inner peripheral surface of the case 1.

The connection terminal 7 has a lead wire connection part 7a held in a terminal holding groove 6a of the connection terminal storage part 6, and a spring part 7b.
Are partly brought into contact with the output terminal electrodes 2a of the substrate 2 and pressed against the substrate 2 to be stored and fixed in the connection terminal storage portion 6. Then, the lead wire 8 inserted from the lead wire holding cylinder 1b is connected to the connection terminal 7 with the core wire 8a sandwiched between the connection pieces 7c.

The surface of the substrate 2 (the lower surface in FIG. 5)
Although not shown, an input terminal electrode to which a high voltage is input, an earth terminal electrode, and the like are formed, and a film resistor of a required pattern having an arc-shaped variable resistance portion between the input terminal electrode and the earth terminal electrode. Are formed. Although not shown, lead terminals or lead wires for grounding and high voltage input are connected to the terminal electrodes by soldering or conductive rubber, and are drawn out from the opening side of the case 1.

[0011]

However, in the connection terminal 7, when each connection terminal is taken out from the component case, the tip of the spring portion 7b of the other connection terminal 7 is inserted into the punched portion of the lead wire connection portion 7a. When the connection terminals 7 are entangled with each other due to the penetration of the connection terminals, it is difficult to separate the connection terminals 7 into individual ones, and the workability of assembling the connection terminals is reduced. There was a problem that the connection terminal 7 was deformed.

In the above high voltage variable resistor,
Since the spring portion 7b of the connection terminal 7 is formed to have a constant width over the entire length and to be curved, the terminal electrode 2 of the substrate 2
a, the contact area of the electrode contact portion with the contact electrode a is small. For example, when an insulating foreign substance is interposed between the electrode contact portion of the spring portion 7b and the terminal electrode 2a, the contact state becomes unstable, resulting in poor conduction. There were problems such as becoming.

Accordingly, an object of the present invention is to solve the above-mentioned problems of the high-voltage variable resistor and eliminate the entanglement of the connection terminals, thereby facilitating the work of assembling the connection terminals. Another object of the present invention is to provide a high-voltage variable resistor capable of obtaining stable and reliable contact / conduction between a connection terminal and an electrode.

[0014]

In order to achieve the above object, the invention according to claim 1 is characterized in that a one-sided open case in which a connection terminal housing is formed, a film resistor and an electrode are formed. A substrate housed in a case, a rotating shaft on which a slider is mounted and is supported by the case, and the electrode or the film resistor housed in the connection terminal housing and connected to an input / output lead wire. The connection terminal has a spring portion bent in a curved shape, and an electrode contacting the electrode or the film resistor at a tip portion of the spring portion. A contact portion is provided, and the electrode contact portion is formed wider than the width of the spring portion.

According to a second aspect of the present invention, in the first aspect of the present invention, the electrode contact portion is provided with a slit, and the electrode contact portion is divided.

According to the above configuration, the width of the electrode contact portion located at the tip of the spring portion is formed wider than other portions, and the electrode contact portion enters the punched portion of the lead wire connection portion. Therefore, the connection terminals do not entangle with each other. In addition, since the contact area between the electrode contact portion and the electrode is increased, stable and reliable contact and conduction can be obtained.

Further, by dividing the electrode contact portion and providing a plurality of contact portions by spring pressure, contact failure due to the presence of foreign matter can be reduced, and more stable and reliable conduction can be obtained.

[0018]

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 reference numerals are given to parts having the same or corresponding functions and the same functions as those of the conventional example.

FIGS. 1 and 2 show the structure of a high-voltage variable resistor according to a first embodiment of the present invention. 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 according to the present embodiment, an electrode contact portion 7d wider than the other portions is formed at the tip of the spring portion 7b of the connection terminal 7. Have been. The electrode contact portion 7d is formed in a substantially rectangular flat surface, is provided integrally with the spring portion 7b, and is provided integrally. The connection terminal 7 is housed in the connection terminal housing portion 6, and is pressed down and fixed by the substrate 2. In this state, the entire surface of the electrode contact portion 7d is formed so as to contact the electrode 2a.

The width of the electrode contact portion 7d is
It is formed to be larger than the gap between the edge portion a and the punched portion of the connection piece 7c. 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 is omitted.

The connection terminal 7 is connected to the lead wire connection portion 7.
a is held in the terminal holding groove 6a of the connection terminal housing 6,
The substrate 2 is fitted into and adhered to the case 1 such that the electrode contact portion 7d contacts the electrode 2a of the substrate 2, and the connection terminal housing 6
Is held within.

In the connection terminal 7 of the present embodiment, the tip of the spring portion 7b has an electrode contact portion 7 wider than other portions.
Since d is provided, the electrode contact portion 7d does not enter the gap between the punched portions of the lead wire connection portions 7a of the other connection terminals 7, and the connection terminal 7 can be easily assembled.

Further, in the above configuration, the width of the electrode contact portion 7d is wide and the surface is in contact with the electrode 2a, so that more stable and reliable conduction is obtained as compared with the conventional example. be able to.

In the above embodiment, the entire surface of the electrode contact portion 7d is formed so as to be in contact with the electrode 2a. However, the present invention is not limited to this, and the electrode contact portion 7d may be formed with a curved surface. .

Next, the structure of the connection terminal according to the second embodiment of the present invention is shown in FIG.

As shown in FIG. 3, the connection terminal 7 of this embodiment
Then, the electrode contact portion 7d provided at the tip of the spring portion 7b
Is formed with a slit 7e, and the electrode contact portion 7d is divided into two by the slit 7e. The slit 7e is provided substantially at the center of the width of the electrode contact portion 7d so as to extend from the tip to a portion connected to the spring portion 7b.

The configuration other than the shape of the electrode contact portion 7d is the same as that described in the first embodiment, and the description thereof will be omitted.

In this configuration, in addition to the effects described in the first embodiment, the electrode contact portion 7d is divided into two by the slit 7e, and the contact portion due to the spring pressure is provided at two places. Is reduced, and more stable and reliable conduction can be obtained. That is, even if foreign matter is present in one of the divided portions, stable contact and conduction can be obtained in the other portion.

In each of the above embodiments, the electrode contact portion has been described as having a substantially square shape. However, the shape of the electrode contact portion is not limited to this, and may be a circular shape as shown in FIG. And other shapes. In short, the electrode contact portion is formed at the tip of the spring portion, and the width of a part of the electrode contact portion only needs to be larger than the width of the spring portion and the gap between the punched portion of the lead wire connection portion.

Further, the shape of the lead wire connection portion of the connection terminal,
The shape and the like of the connection terminal accommodating portion of the case 1 are not particularly limited to the above-described embodiment.

[0032]

As described above, according to the high-voltage variable resistor according to the present invention, an electrode contact portion wider than other portions is provided at the tip of the spring portion of the connection terminal. Therefore, there is no entanglement between the connection terminals, and the connection terminal can be easily assembled.

Further, since the contact area between the electrode contact portion and the electrode is increased, stable and reliable contact and conduction can be obtained.

Further, by dividing the electrode contact portion, it is possible to reduce poor contact due to the presence of foreign matter, and to obtain more stable and reliable conduction.

[Brief description of the 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 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 perspective view of a connection terminal of a high-voltage variable resistor according to a second embodiment of the present invention.

FIG. 4 is a perspective view of a connection terminal of a high-voltage variable resistor according to another embodiment of the present invention.

FIG. 5 is a side sectional view of a conventional high-voltage variable resistor.

FIG. 6 is an exploded perspective view showing a structure for holding a connection terminal of a conventional high-voltage variable resistor.

FIG. 7 is a cross-sectional view showing a holding portion of a connection terminal of a conventional high-voltage variable resistor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 1a Bearing part 1b Lead wire holding cylinder 2 Substrate 2a Electrode 3 Resin 4 Slider 5 Rotating shaft 6 Connection terminal storage part 7 Connection terminal 7a Lead wire connection part 7b Spring part 7c Connection piece 7d Electrode contact part 7e Slit 8 Lead Wire 8a core wire

Claims (2)

(57) [Claims] 1. A case having a one-sided opening in which a connection terminal housing portion is formed, a substrate formed with a film resistor and an electrode formed in the case, a slider mounted thereon and supported by the case. In a high-voltage variable resistor including a rotating shaft and a connection terminal housed in the connection terminal housing portion and connecting the electrode or the film resistor to an input / output lead wire, the connection terminal is curved. Having a spring part bent into a shape,
An electrode contact portion that contacts the electrode or the film resistor is provided at a tip of the spring portion, and the electrode contact portion is formed wider than the width of the spring portion. vessel. 2. A slit is provided in the electrode contact portion,
The high-voltage variable resistor according to claim 1, wherein the electrode contact portion is divided.