JP2004022909A - Variable resistor for high voltage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a variable resistor for a high voltage in which the number of kinds of a pull-out guide members is reduced. <P>SOLUTION: A plurality of projecting ribs 16 are formed in advance at prescribed positions on the surface (flyback transformer resin contact surface S) of a flyback transformer side while being matched with positions of input/output terminals of flyback transformers of a plurality of kinds. Each projecting rib 16 is formed approximately columnar and formed with a slit 17 at its center. Conductive rubber 36 is internally held. A pull-out guide member 35 is pressed into the projecting rib 16 alternatively selected out of the plurality of projecting ribs 16 by the mounted flyback transformer. The conductive rubber 36 is electrically connected to conductive rubber 6a via a lead wire 38. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a high-voltage variable resistor, particularly to a high-voltage variable resistor used for adjusting a focus voltage and a screen voltage of a television receiver or the like.
[0002]
[Prior art]
Generally, this kind of high-voltage variable resistor is used integrally with a flyback transformer. For example, a high-voltage variable resistor 100 shown in FIG. 10 includes an insulating case 101, a resistor substrate housed inside the insulating case 101 and having a variable resistance circuit pattern formed on the surface, a surface of the resistor substrate and the insulating case 101. And a slider held between them. After the high-voltage variable resistor 100 is mounted on the flyback transformer, the flyback transformer insulating resin is cast into a gap formed between the flyback transformer resin contact surface S of the insulating case 101 and the flyback transformer. Is done. Thus, the high-voltage variable resistor 100 and the flyback transformer are firmly joined via the flyback transformer insulating resin.
[0003]
On the resin contact surface S of the flyback transformer, conductive rubbers 106a and 106b, which are external terminal connecting portions, and holding portions 105a and 105b holding the conductive rubbers 106a and 106b are provided. The input / output terminals of the flyback transformer are electrically connected to the conductive rubbers 106a and 106b.
[0004]
By the way, the positions of the external terminal connection portions (conductive rubber) 106a and 106b can be almost changed due to the arrangement of the resistors and the sliders of the resistor substrate housed inside the insulating case 101. Can not. On the other hand, the positions of the input / output terminals of the flyback transformer differ depending on the specifications and the manufacturers.
[0005]
For this reason, in the conventional high-voltage variable resistor 100, a notch 102 is provided in the side wall 101a of the insulating case 101 in order to correct the positions of the external terminal connection portions 106a and 106b. The arm 112 extending from the pull-out guide member 110 is locked. A conductive rubber 113 is held in the drawer guide member 110, and the conductive rubber 113 is electrically connected to the external terminal connecting portion 106 a via a lead wire 120. Therefore, by fitting the input / output terminals of the flyback transformer into the conductive rubber 113, the external terminal connection portion 106a and the flyback transformer are electrically connected.
[0006]
Thus, by changing the length and shape of the arm 112 of the drawer guide member 110 in accordance with the positions of the input / output terminals of various flyback transformers, the disadvantages of the external terminal connection portions 106a and 106b whose positions cannot be changed have been solved. .
[0007]
[Problems to be solved by the invention]
However, in the conventional high-voltage variable resistor 100, it is necessary to prepare a plurality of types of drawer guide members 110 having different lengths and shapes of the arms 112. For this reason, the cost of the mold for forming the drawer guide member 110 has increased, and the number of storage parts at the manufacturing site has increased, and inventory management has been complicated.
[0008]
Therefore, an object of the present invention is to provide a high-voltage variable resistor capable of suppressing the type of the draw-out guide member.
[0009]
Means and action for solving the problem
In order to achieve the above object, the high-voltage variable resistor according to the present invention,
(A) a resistance substrate provided with a resistor and a terminal electrode on its surface;
(B) at least one rotating shaft having a slider that slides on the resistor;
(C) an insulating case for housing the resistance substrate therein;
(D) an external terminal connecting portion provided on the flyback transformer side surface of the insulating case;
(E) a plurality of convex ribs provided on the flyback transformer side surface of the insulating case;
(F) a draw-out guide member to be locked to the convex rib;
(G) connecting means for electrically connecting the external terminal connection portion and the draw-out guide member;
It is characterized by having.
[0010]
With the above configuration, a plurality of convex ribs are provided in advance at predetermined positions on the flyback transformer side surface in accordance with the positions of the input / output terminals of the plurality of types of flyback transformers. Then, the flyback transformer to be attached selects one of the plurality of convex ribs to lock the drawer guide member. When the input / output terminal of the flyback transformer is electrically connected to the draw-out guide member, the external terminal connection portion is electrically connected to the flyback transformer. Therefore, only one kind of drawer guide member is required.
[0011]
The draw-out guide member has, for example, a substantially cylindrical shape and is press-fitted into the convex rib. The convex rib is provided with a slit, and a protrusion provided on the drawer guide member is fitted into the slit. As a result, the drawer guide member is firmly locked to the convex rib.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of a high-voltage variable resistor according to the present invention will be described below with reference to the accompanying drawings.
[0013]
FIG. 1 is a perspective view of the high-voltage variable resistor 31 as viewed from the rear side, FIG. 2 is an exploded longitudinal sectional view thereof, and FIG. 3 is a longitudinal sectional view after assembly is completed. The high-voltage variable resistor 31 includes an insulating case 1 configured by combining a front case 1a and a rear case 1b, a resistance board 2, rotating shafts 3a and 3b, and conductive rubbers 6a and 6b serving as external terminal connecting portions. , A drawing guide member 35 and a lead wire 38. However, the drawing guide member 35 and the lead wire 38 are not shown in FIGS. The front case 1a and the rear case 1b are resin molded products.
[0014]
The rear case 1b includes a rectangular flat plate-shaped portion 10b, a side wall 11b formed on the periphery of the plate-shaped portion 10b, cylindrical holding portions 15a and 15b formed on the plate-shaped portion 10b, And the convex rib 16 of FIG. Further, a flyback transformer resin contact surface S is formed on the outer surface of the plate-shaped portion 10b.
[0015]
The plurality of convex ribs 16 are provided in advance at predetermined positions on the flyback transformer resin contact surface S in accordance with the positions of the input / output terminals of the plurality of types of flyback transformers. Each of the convex ribs 16 has a substantially columnar shape, and a slit 17 is provided at the center. The convex ribs 16 can be obtained easily and inexpensively by forming them at the same time when the rear case 1b is molded.
[0016]
As shown in FIGS. 4 and 5, the drawer guide member 35 has a substantially cylindrical shape, and a partition wall 35a that partitions the inside up and down is provided at the center. A conductive rubber 36 is held on the upper side inside the drawer guide member 35 partitioned by the partition wall 35a, and a projection 37 protruding downward is provided on the lower side. Further, a notch 35b is formed at the upper end of the extraction guide member 35 so that the lead wire 38 can be easily connected to the conductive rubber 36.
[0017]
The draw-out guide member 35 is press-fitted into the convex rib 16 selected from a plurality of convex ribs 16 by a flyback transformer to be attached. The protrusion 37 provided on the draw-out guide member 35 fits into the slit 17 of the convex rib 16. As a result, the drawer guide member 35 is securely locked to the convex rib 16. Further, the rotation of the draw-out guide member 35 is stopped by the slit 17, and the notch 35b can be positioned. The conductive rubber 36 is electrically connected to the conductive rubber 6a via a lead wire 38.
[0018]
As shown in FIG. 6, the front case 1a includes, for example, a rectangular flat plate-shaped portion 10a, a side wall portion 11a formed on the periphery of the plate-shaped portion 10a, and a bearing portion 5a formed on the plate-shaped portion 10a. , 5b.
[0019]
The front case 1a and the rear case 1b are fitted by engaging the engaging projections 41a and 41b with the engaging step 42a and the engaging groove 42b provided corresponding to the engaging projections 41a and 41b. I agree.
[0020]
A recess 9 having a width substantially equal to the thickness of the resistance substrate 2 is provided on the inner wall surfaces of the two opposing side wall portions 11a of the front case 1a. The edge of the resistance substrate 2 is fitted into the recess 9 and held and fixed inside the insulating case 1. Instead of providing the recess 9 in the front case 1a, a structure may be provided in the rear case 1b and the resistance substrate 2 is held by the rear case 1b. As shown in FIGS. 3 and 6, rotating shafts 3a and 3b having sliders 4a and 4b are supported by cylindrical bearings 5a and 5b provided on the surface of the front case 1a.
[0021]
As shown in FIG. 7, a focus voltage output terminal electrode 21, a screen voltage output terminal electrode 22, a variable resistor part 23a for focus voltage adjustment and a screen voltage adjustment , A front-side input terminal electrode 24a and a front-side ground terminal electrode 25a that are electrically connected to the resistor 23 are formed. One end of each of the sliders 4a, 4b is in contact with the center electrodes 21a, 22a conducting to the output terminal electrodes 21, 22, and the other end is arranged to slide on the arc-shaped variable resistance portions 23a, 23b. I have. Therefore, a desired resistance value can be set by contacting the tip of the driver with the cross groove in the head of the rotating shafts 3a and 3b and rotating the rotating shafts 3a and 3b, respectively.
[0022]
An input terminal contact electrode 24b electrically connected to the input terminal electrode 24a by a through hole 26a is formed on the back surface of the resistance substrate 2, and an earth terminal contact electrode 25b electrically connected to the ground terminal electrode 25a by the through hole 26b. Is formed.
[0023]
As shown in FIG. 3, one end of each of the conductive rubbers 6a and 6b is in contact with the input terminal contact electrode 24b and the ground terminal contact electrode 25b so as to press the same, and the other end is connected to the holding portion 15a of the rear case 1b. 15b. In the present embodiment, the conductive rubbers 6a and 6b are used as the conductors. However, the present invention is not limited to this, and another conductor may be used.
[0024]
As shown in FIG. 6, the insulating case 1 has a lead wire holding portion 13a for inserting and holding an output lead wire for extracting a focus voltage, and a lead wire holding portion for inserting and holding an output lead wire for extracting a screen voltage. A portion 13b is formed. As shown in FIG. 8, a terminal fitting portion 14 is provided on the inner surface of the front case 1a. The terminal fitting portion 14 communicates with the lead wire holding portion 13a through a communication hole 18.
[0025]
The lead wire connecting member 8 is housed and held in the terminal fitting portion 14. The lead wire connecting member 8 is formed by stamping a flat metal into a substantially rectangular shape, and has a plurality of claws for holding the core of the output lead wire 7 inward at the center thereof. It has a portion 81.
[0026]
When the output lead wire 7 is inserted into the lead wire holding portion 13a, the core wire of the output lead wire 7 is pressed into the holding portion 81 of the lead wire connecting member 8. The press-fitting of the core of the output lead wire 7 causes the claw to bend in the press-fitting direction and to be pressed against the core. Therefore, the lead wire connecting member 8 can be electrically connected to the core wire, and can be reliably prevented from coming off. Note that the claws of the holding portion 81 may be formed with a slight inclination in the press-fitting direction in advance. The spring portion 82 of the lead wire connecting member 8 is in pressure contact with the output terminal electrodes 21 and 22 on the surface of the resistance substrate 2 with an appropriate pressure to secure electrical continuity between the resistance substrate 2 and the output lead wire 7. I have.
[0027]
As described above, the structure near one lead wire holding portion 13a has been described with reference to FIG. 8, but the structure near the other lead wire holding portion 13b is also substantially the same, so description and illustration are omitted.
[0028]
The high-voltage variable resistor 31 having the above configuration is integrated with the flyback transformer 61 as shown in FIG. That is, the rear case 1b side of the high-voltage variable resistor 31 is fitted to the insulating case 62 of the flyback transformer 61. At this time, the input terminal 71 of the flyback transformer 61 fits into the conductive rubber 36 of the drawer guide member 35, and the ground terminal 72 of the flyback transformer 61 fits into the conductive rubber 6b. As a result, the flyback transformer 61 and the resistance substrate 2 are electrically connected. In the case of the present embodiment, the draw-out guide member 35 is not used for the ground terminal 72 of the flyback transformer 61. However, depending on the type of flyback transformer, the ground terminal 72 may also use the draw-out guide member 35.
[0029]
Next, the flyback transformer insulating resin 63 is cast into a gap formed between the flyback transformer resin contact surface S of the high-voltage variable resistor 31 and the flyback transformer 61. Thus, the high-voltage variable resistor 31 and the flyback transformer 61 are firmly joined via the flyback transformer insulating resin 63.
[0030]
The flyback transformer 61 includes a low-voltage coil 65, a high-voltage coil 66, a pair of U-shaped magnetic cores 67, and an insulating case 62.
[0031]
Thus, by providing the plurality of convex ribs 16 in accordance with the positions of the input / output terminals of various flyback transformers, the problems of the conductive rubbers (external terminal connection portions) 106a and 106b whose positions cannot be changed are eliminated. can do. In addition, since only one kind of drawer guide member 35 is required, the number of parts can be reduced, and the die investment can be suppressed.
[0032]
The high-voltage variable resistor according to the present invention is not limited to the above-described embodiment, but can be variously changed within the scope of the gist. For example, in the above-described embodiment, the high-voltage variable resistor 31 and the flyback transformer 61 are joined via the flyback transformer insulating resin 63. However, the present invention is not limited to this. The back transformer 61 may be joined without the flyback transformer insulating resin.
[0033]
Further, in the above-described embodiment, the spring portion 82 ensures conduction between the output lead wire 7 and the resistance substrate 2, but instead of the spring portion 82, a conductor such as a coil spring or conductive rubber may be provided. .
[0034]
Further, in the above-described embodiment, the high-voltage variable resistor that outputs one focus voltage and one screen voltage has been described. However, the present invention is not limited to this. For example, a so-called double-focus type that outputs two focus voltages may be used. It may be a so-called high-voltage variable resistor.
[0035]
【The invention's effect】
As is apparent from the above description, according to the present invention, a plurality of convex ribs are provided in advance at predetermined positions on the flyback transformer side surface in accordance with the positions of the input / output terminals of a plurality of types of flyback transformers. By doing so, it is possible to solve the problem of the external terminal connection portion whose position cannot be changed. Also, since only one type of drawer guide member is required, the number of parts can be reduced, and the die investment can be suppressed. As a result, a high-voltage variable resistor with low manufacturing cost can be obtained.
[Brief description of the drawings]
FIG. 1 is a perspective view of one embodiment of a high-voltage variable resistor according to the present invention as viewed from the rear side.
FIG. 2 is an exploded vertical sectional view of the high-voltage variable resistor shown in FIG.
FIG. 3 is a longitudinal sectional view of the high-voltage variable resistor shown in FIG. 1;
FIG. 4 is a perspective view showing a drawer guide member shown in FIG. 1;
FIG. 5 is a sectional view taken along line VV of FIG. 4;
FIG. 6 is a front view of the high-voltage variable resistor shown in FIG. 1;
FIG. 7 is a plan view of a resistance substrate used in the high-voltage variable resistor shown in FIG. 1;
FIG. 8 is a vertical cross-sectional view of a lead wire holding unit for extracting a focus voltage.
9 is a longitudinal sectional view showing a state in which the high-voltage variable resistor shown in FIG. 1 is integrated with a flyback transformer.
FIG. 10 is a perspective view of a conventional high-voltage variable resistor viewed from the back side.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Insulating case 1a ... Front case 1b ... Back case 2 ... Resistance board 3a, 3b ... Rotating shaft 4a, 4b ... Slider 5a, 5b ... Bearing part 6a, 6b ... Conductive rubber (external terminal connection part)
10a, 10b ... plate-like portions 11a, 11b ... side wall portions 16 ... convex ribs 17 ... slits 23 ... resistors 24a, 25a ... terminal electrodes 31 ... high-voltage variable resistors 35 ... draw-out guide members 36 ... conductive rubber 37 ... Projection 38: Lead wire S: Flyback transformer resin contact surface

Claims (4)

A high voltage variable resistor integrated with a flyback transformer,
A resistor substrate provided with a resistor and a terminal electrode on its surface,
At least one rotating shaft having a slider that slides on the resistor,
An insulating case accommodating the resistance substrate therein,
An external terminal connection portion provided on a flyback transformer side surface of the insulating case,
A plurality of convex ribs provided on the flyback transformer side surface of the insulating case;
A drawer guide member which is locked to the convex rib,
Connection means for electrically connecting the external terminal connection portion and the extraction guide member;
A high-voltage variable resistor comprising: 2. The high-voltage variable resistor according to claim 1, wherein the drawer guide member has a substantially cylindrical shape, and the drawer guide member is fitted on the convex rib. 3. 3. The high-voltage variable resistor according to claim 1, wherein a slit is provided in the convex rib. 4. The high-voltage variable resistor according to claim 3, wherein the draw-out guide member has a protrusion that fits into the slit of the convex rib. 5.

Images