JP2002289410A - High-voltage variable resistor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-voltage variable resistor which is simple in structure, inexpensive, and equipped with an internal output terminal and an external output terminal that are formed into solid structures so as to be improved in continuity reliability. SOLUTION: This high-voltage variable resistor is equipped with a board 20 with resistors 23 and 24 and terminal electrodes 26 and 27 formed on its surface, rotary shafts 33 and 34 with sliders 30 and 31 sliding on the resistors 23 and 24, and an insulating case 1 which is provided with an open side and supports the rotary shafts 33 and 34 in a rotatable manner and where the board 20 is housed so as to confront its inner bottom. Connecting terminals 52 and 53 penetrate the terminal electrodes 26 and 27 of the board 20 and are fixed to them so as to electrically connected, ends of the connecting terminals 52 and 53 are protruded from the rear side of the board 20, and the other ends are exposed on the front side of the case 1 through the through-holes 6a and 6b, and output lead wires R1 and R2 are connected to the other ends.

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, a screen voltage and the like of a television receiver or the like.

[0002]

2. Description of the Related Art Hitherto, a high-voltage variable resistor called a focus pack has been used to adjust a focus voltage or a screen voltage of a color television, a display monitor, or the like. In this type of high-voltage variable resistor,
For example, an internal output terminal is connected and fixed to the substrate on which the resistor is formed, and one end of the internal output terminal is projected to the back side of the substrate, the other end of the terminal is penetrated through the substrate, and the other end is One that is in contact with a spring portion of an external output terminal disposed on the front side of the substrate (for example,
And Japanese Patent Application Laid-Open No. Hei 9 (1998) -139, and a device in which the other end of the internal output terminal is penetrated through the substrate, and the other end is connected to an external output terminal via a conductive rubber disposed on the surface side of the substrate.
-326306). The external output terminal is provided with a holding piece to which an output lead wire is inserted and connected.

[0003]

In any of the above cases,
The internal output terminal and the external output terminal are formed of different members, and the two terminals are brought into contact directly or via an intermediate member to achieve electrical continuity. However, in such an electrical connection method by contact, the reliability of conduction is low, and there is a possibility that poor contact may occur between both terminals due to variations in assembly. In addition, the number of parts is large, the structure of each part is complicated, and the number of processing steps is large.

Accordingly, an object of the present invention is to provide a high-voltage variable resistor having a simple structure and a low cost while improving the conduction reliability by integrally forming an internal output terminal and an external output terminal. Is to do.

[0005]

In order to achieve the above object, the invention according to claim 1 comprises a substrate having a resistor and a terminal electrode formed on a surface thereof, and a sliding member which slides on the resistor. A rotating shaft having a rotor, a one-sided opening-shaped insulating case in which the rotating shaft is bearing and the substrate is housed and fixed so that the surface thereof faces the inner bottom portion, and is electrically connected to the terminal electrode. As described above, one end protrudes to the back side of the substrate, and the other end is exposed to the front side of the insulating case through the through hole of the insulating case. And a connection terminal to which a wire is connected.

In the present invention, output to both the front and back (inside and outside) of the high-voltage variable resistor is enabled by one connection terminal attached to the substrate. That is, the connection terminals are penetrated and fixed to the substrate, and are electrically connected to the terminal electrodes of the substrate. One end of the connection terminal protrudes to the back side of the substrate, and a capacitor is connected to this one end, for example. The other end of the connection terminal is exposed to the front side through a through hole of the insulating case, and an output lead wire for extracting a focus voltage is connected to this other end. Thus, conventionally,
Since the connection terminal composed of parts or three parts is composed of one terminal, conduction reliability is remarkably improved as compared with the related art, and the external output can be taken out without attenuating. In addition, the number of parts can be reduced, and the connection terminals can be formed of ordinary round lead terminals, so that the cost can be reduced.

According to a second aspect of the present invention, a tapered surface for guiding insertion of the other end of the connection terminal may be formed on the back surface side of the through hole of the insulating case. In other words, when the board to which the connection terminal is fixed is housed in the insulating case, if the connection terminal and the through-hole of the insulating case do not correspond exactly, the board cannot be housed in the case or the connection terminal is bent. May occur. Therefore, by forming a tapered surface on the back surface side of the through hole of the case, even if the position of the connection terminal and the through hole of the insulating case are slightly shifted, the other end of the connection terminal is formed by the tapered surface. By guiding the substrate, the assemblability of the substrate and the connection terminal can be improved.

According to a third aspect of the present invention, the through hole of the insulating case and the through hole of the substrate through which the connection terminal is fixed are formed at different positions in the plane direction of the substrate, and the connection terminal is fixed through the substrate. A plurality of bent portions may be formed between the portion and the portion inserted into the through hole of the insulating case. That is, in the case of the conventional structure, it is necessary to provide the external output terminal at a position facing the substrate through hole to which the internal output terminal is fixed in order to make the internal output terminal and the external output terminal contact and conduct. Was. Therefore, a space for accommodating the external output terminal must be provided at a position facing the substrate through-hole, but the space as described above cannot be provided due to interference with the ribs and the rotation shaft of the insulating case. There was a case. On the other hand, by bending the connection terminal as in claim 3, it is possible to shift the position of the through hole of the substrate and the position of the through hole of the insulating case, so that the position does not interfere with the ribs and the rotating shaft of the case. The other end of the connection terminal can be pulled out from an appropriate position. Also, when changing the external output position according to the user's request or changing the position of the through hole of the board to cope with high voltage, it is necessary to match the through hole of the board with the through hole of the insulating case. Since there is no connection terminal, it can be easily handled only by bending the connection terminal.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a high-voltage variable resistor according to a first embodiment of the present invention will be described with reference to FIGS. The high-voltage variable resistor according to this embodiment is of a so-called double focus type that outputs two focus voltages and one screen voltage, and includes a case body 1 having an open surface on one side and a cover 10 covering the front side thereof. Thus, the insulating case is configured. A substrate 20 made of alumina ceramics or the like is bonded and fixed to a step portion 2 formed on the inner peripheral surface of the case main body 1 so that the surface thereof faces the inner bottom of the case main body 1. Slider 30 is provided on cylindrical bearings 3a to 3c provided on the front surface of case body 1.
The rotating shafts 33 to 35 to which the components 32 to 32 are attached are rotatably supported. The rotating shafts 33 and 34 are used for adjusting the focus voltage, and the rotating shaft 35 is used for adjusting the screen voltage, and protrudes from the holes 11 to 13 of the cover 10 to the front.

An epoxy resin 4 is provided on the back side of the substrate 20.
0 is molded, and two capacitors C1 and C2 are arranged on the resin 40. The capacitor C1 is a coupling capacitor for a dynamic focus signal. One lead wire is connected to one end (internal output portion) 52a of a focus voltage output connection terminal 52 described later, and the other lead wire is a parabolic waveform signal. Connected to terminal 55. The signal terminal 55 is formed in an L-shape, and is fixed to a terminal block 5b formed on the case body 1 as shown in FIG. The capacitor C <b> 2 is a filter capacitor, and one lead is connected to one end (internal output) 53 a of the focus voltage output connection terminal 53, and the other lead is connected to the ground terminal 51. The ground terminal 51 is also formed in an L-shape similarly to the signal terminal 55, and is fixed to a terminal block 5 b formed on the case main body 1 as shown in FIG. In the present embodiment, the capacitors C1 and C2 are attached after filling and curing the resin 40. However, after attaching the capacitors C1 and C2,
The resin 40 may be filled.

As shown in FIG. 2, grooves 4a to 4c for fitting three output lead wires R1 to R3 are formed on the front surface of the case body 1, and two opposite side surfaces of the cover 10 are formed. Are provided with cylindrical holding portions 14 to 16 for inserting and holding the output lead wires R1 to R3. Groove 4
One end of each of a to 4c is open at the end face of the case body 1, and the connection terminals 52 to 54 are exposed at the other end. A peripheral groove 8 is formed around the entire outer peripheral portion of the case main body 1, and the case main body 1 and the cover 10 are united by fitting the opening edge 17 of the cover 10 into the peripheral groove 8.

On the surface of the substrate 20, as shown in FIG.
Between the input electrode 21 and the ground electrode 22, first and second variable resistors 23 and 24 for focus voltage adjustment and a variable resistor 25 for screen voltage adjustment are formed. The variable resistors 23, 24 and 25 are all formed in an arc shape, and the variable resistors 23 and 24 are formed back to back. Further, on the surface of the substrate 20, the sliders 30, 24 with respect to the variable resistors 23, 24 for adjusting the focus voltage are provided.
The first and second focus voltage output electrodes 26 and 27 are electrically connected to each other via a reference 31, and the screen voltage output electrode 28 is electrically connected to a variable resistor 25 for adjusting a screen voltage via a slider 32. Are provided.

The terminal electrodes 21, 22, 26, 2 of the substrate 20
A high voltage input terminal 50, a ground lead wire 56, focus voltage output connection terminals 52 and 53, and a screen voltage output terminal 54 are fixedly connected to 7, 28, respectively. The input terminal 50 protrudes only on the rear surface side of the substrate 20 and protrudes from the resin 40 filled on the substrate 20. As shown in FIG. 7, the ground lead 56 protrudes from the resin 40 and is connected to the terminal block 5 a of the case body 1.
Is connected to a ground terminal 51 fixed to the terminal. The ground terminal 51 is connected to the ground lead 56 and the capacitor C2 lead.

As shown in FIG. 8, the focus voltage output connection terminal 52 is connected to the through hole 26 of the terminal electrode 26 of the substrate 20.
a and soldered to the terminal electrode 26. One end 52a of the terminal 52 protrudes from the resin 40, and one end of the coupling capacitor C1 is connected to this end. The other end 52b of the terminal 52 is exposed to the groove 4a of the case main body 1 through a through hole 6a formed in the case main body 1. On the back side of the through hole 6a, a tapered surface 7a for guiding the insertion of the other end 52b of the terminal 52 is provided.
Are formed. A focus output lead R1 is connected by soldering to the other end 52b of the terminal 52 exposed to the groove 4a.

A connection terminal 53 for focus voltage output
9 is inserted through the through hole 27a of the terminal electrode 27 of the substrate 20 and soldered to the terminal electrode 27, as shown in FIG. One end 53a of the terminal 53 protrudes from the resin 40, and one end of the filter capacitor C2 is connected to this end. The other end 53b of the terminal 53 is exposed to the groove 4b of the case body 1 through a through hole 6b formed in the case body 1. In particular, the through-hole 6b of the case body 1 and the terminal electrode 27 of the substrate 20 through which the terminal 53 is fixed are formed at different positions in the plane direction of the substrate. A plurality of bent portions 53c are formed between the case body 1 and a portion inserted into the through hole 6b. Also in this case, a tapered surface 7b for guiding insertion of the other end 53b of the terminal 53 is formed on the back side of the through hole 6b. Groove 4
The focus output lead wire R2 is connected to the other end 53b of the terminal 53 exposed to the terminal b by soldering.

One end 5 of screen voltage output terminal 54
4a, as shown in FIG. 10, is inserted into the through hole 28a of the output terminal electrode 28 of the board 20 and soldered.
The other end 54b is exposed to the groove 4c of the case body 1 via a through hole 6c formed in the case body 1. In addition,
A tapered surface 7c for guiding insertion of the other end 54b of the terminal 54 is formed on the back surface side of the through hole 6c. A screen output lead wire R3 is connected by soldering to the other end 54b of the terminal 54 exposed in the groove 4c.

As described above, the terminal electrodes 26, 2 of the substrate 20
7, the focus voltage output connection terminals 52 and 53 for connecting the capacitors C1 and C2 and the focus output lead wires R1 and R2 are composed of one terminal.
The conduction reliability is improved as compared with the conventional case where a plurality of components are used, and an output signal can be extracted without attenuating. Also, because it can be configured with one part,
Since the number of parts can be reduced, and the connection terminals 52 and 53 can be constituted by ordinary pin-type terminals, the cost can be reduced. Even when the through hole 27a of the substrate 20 and the through hole 6b of the case body 1 are displaced in the plane direction, it is possible to easily cope with the deviation in the plane direction by bending the focus voltage output connection terminal 53. it can.

FIGS. 11 to 14 show a high-voltage variable resistor according to a second embodiment of the present invention. Parts other than the following structure are the same as those in the first embodiment, and therefore, the same parts are denoted by the same reference numerals and the description thereof will not be repeated. In the first embodiment, an example is shown in which the focus output lead wires R1 and R2 and the screen output lead wire R3 are drawn in opposite directions to the case, but in this embodiment, the screen output lead wire R3 is focused. Output lead wires R1, R2
Are pulled out in an oblique direction.

At the end of the case body 1, a connection terminal housing 60 is provided.
Are provided, and a screen voltage output terminal 61 is inserted and held in the connection terminal storage section 60. Notches 62 and 63 provided on the side surface of case body 1 and the side surface of cover 10
The screen output lead wire R3 is inserted into the connection terminal housing part 60 via the connector terminal, and the core wire is inserted into the holding piece of the terminal 61 to be electrically connected.

The shape of the connection terminal 61 is the same as that shown in FIG. 5 of Japanese Patent Application Laid-Open No. 9-326306, for example, and includes a flat plate portion having a plurality of holding pieces for holding the core of the lead wire R3, and a curved portion. And a spring portion bent into a shape, and the spring portion is in contact and conduction with a terminal electrode 28 formed on the surface of the substrate 20. In this case, it is possible to electrically connect with the connection terminal 61 only by inserting the lead wire R3, and to prevent the connection terminal 61 from coming off. Further, the connection terminals 61 and the terminal electrodes 28 of the substrate 20 can be brought into contact and continuity by the spring portions without soldering.

FIGS. 15 and 16 show a high-voltage variable resistor according to a third embodiment of the present invention. In this embodiment, the cover is eliminated and the other ends 52b and 53 of the focus voltage output connection terminals 52 and 53 and the screen voltage output terminal 54 are provided on the front surface of the case 1 where the rotating shafts 33 to 35 are exposed.
b, 54b, and the terminals 52-5
The mounting part 70 surrounding the 4 is integrally formed. The connection metal fittings 71 attached to the tips of the focus output lead wires R1 and R2 and the screen output lead wire R3 are inserted into the terminals 52 to 54, and the protective cylinder 72 is fitted to the mounting portion 70, thereby obtaining the lead wire R1. , R2, R3 are connected to a high voltage variable resistor. In this case, the lead R
1, R2, and R3 can be connected to the terminals 52 to 54 simply by inserting them, so that the soldering operation can be omitted and the connection operation can be simplified. In addition, the connection fitting 71 is connected to the lead wires R1, R2,
Not only on the R3 side but also on the terminals 52 to 54 side.

FIG. 17 shows a high-voltage variable resistor according to a fourth embodiment of the present invention. In this embodiment, a part of the third embodiment is modified, and a connection portion 80 for connecting a screen output lead R3 is provided on a side surface of the case 1. Since the specific structure of the connecting portion 80 is the same as that of the second embodiment (FIGS. 11 to 14), the duplicate description will be omitted.

In the above embodiment, the high voltage variable resistor that outputs two focus voltages and one screen voltage has been described. However, the present invention is not limited to this.
The present invention can be applied to a high-voltage variable resistor that outputs at least one focus voltage or screen voltage. As described in the above embodiment, as a method of outputting a focus voltage, in addition to a method of soldering a lead wire to a terminal, there is a method of plug-in connection using a connection fitting 71, and a method of outputting a screen voltage includes: There are a method of soldering lead wires, a method of plug-in connection using a snap terminal 61, a method of plug-in connection using a connection fitting 71, and the like. In addition, any method such as welding and connection using crimp terminals can be used.

[0024]

As described above, according to the present invention,
Both ends of the connection terminal connected to the terminal electrode of the substrate are exposed to the front and back sides of the high-voltage variable resistor, and the internal output portion and the external output portion are used. The terminal can be composed of one terminal. Therefore, it is not necessary to conduct the plurality of components in contact and conduction, and the conduction reliability is significantly improved, and the external output can be taken out without attenuating. In addition, the number of parts can be reduced, and the connection terminals can be constituted by terminals having a simple structure, so that the cost can be reduced.

[Brief description of the drawings]

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

FIG. 2 is a perspective view showing a state where a case and a cover of the high-voltage variable resistor shown in FIG. 1 are separated.

FIG. 3 is a rear view of the high-voltage variable resistor shown in FIG. 1;

FIG. 4 is a rear view of a case used for the high-voltage variable resistor shown in FIG. 1;

FIG. 5 is a front view of a substrate used in the high-voltage variable resistor shown in FIG.

FIG. 6 is a sectional view taken along line XX of FIG. 3;

FIG. 7 is a sectional view taken along line YY of FIG. 3;

FIG. 8 is an enlarged sectional view of a first focus voltage output unit.

FIG. 9 is an enlarged cross-sectional view of a second focus voltage output unit.

FIG. 10 is an enlarged sectional view of a screen voltage output unit.

FIG. 11 is a perspective view of a high-voltage variable resistor according to a second embodiment of the present invention.

FIG. 12 is a perspective view showing a state where a case and a cover of the high-voltage variable resistor shown in FIG. 11 are separated.

FIG. 13 is a sectional view of the high-voltage variable resistor shown in FIG. 11;

14 is a rear view of a case used in the high-voltage variable resistor shown in FIG.

FIG. 15 is a perspective view of a high-voltage variable resistor according to a third embodiment of the present invention.

16 is an enlarged sectional view of a focus voltage output section of the high-voltage variable resistor shown in FIG.

FIG. 17 is a perspective view of a high-voltage variable resistor according to a fourth embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Case main body 6a-6c Through-hole 7a-7c Tapered surface 10 Cover 20 Substrate 23-25 Resistor 26, 27 Focus voltage output electrode 28 Screen voltage output electrode 30-32 Slider 33-35 Rotation axis 40 Resin 52 , 53 Focus voltage output connection terminal (connection terminal) 54 Screen voltage output terminal R1, R2 Focus output lead R3 Screen output lead

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H01C 10/32 H01C 10/32 B

Claims (3)

[Claims] 1. A substrate having a resistor and a terminal electrode formed on a surface thereof, a rotating shaft having a slider that slides on the resistor, a rotating shaft bearing the bearing, and the substrate being provided on a surface thereof. And an insulating case having a one-sided opening that is housed and fixed so as to face the inner bottom portion, and is penetrated and fixed to the substrate so as to be electrically connected to the terminal electrode, and one end protrudes toward the back side of the substrate. The other end is exposed to the front side of the insulating case through the through hole of the insulating case, and the other end is provided with a connection terminal to which an output lead wire is connected. Resistor. 2. The high-voltage variable resistor according to claim 1, wherein a tapered surface for guiding insertion of the other end of the connection terminal is formed on a back surface side of the through hole of the insulating case. vessel. 3. The through-hole of the insulating case and the through-hole of the board through which the connection terminal is fixed are formed at different positions in the plane direction of the board, and the through-hole of the connection terminal is fixed to the board. The high-voltage variable resistor according to claim 1 or 2, wherein a plurality of bent portions are formed between the insulating case and a portion inserted into the through-hole of the insulating case.