JPH03252102A - Rheostat for high voltage - Google Patents

Abstract

PURPOSE:To simplify structure, to confirm a design and reliability in a short time and to obtain a low-cost rheostat having high reliability by composing the rheostat of a cap-shaped case holding a shaft with a slider, a resin board sustaining an insulating substrate and a resin layer, etc., covering an electric active section and ensuring insulating properties with the outside. CONSTITUTION:A rheostat consists of an insulating substrate 1, on a surface of which a resistor section 1a and electrode sections 1b connected to the resistor section 1a are formed, a resin board 3, to which ribs 3a abutted against approximately the outer circumference of the insulating substrate 1 are formed, terminals 4 connected to said electrode sections 1b and a cap-shaped case 7, one end of which is formed in an opening shape and a bottom section of which has a through-hole 7b and in which a shaft 5 with a slider 6 slid on the resistor section 1a is mounted rotatably to the through-hole 7b. Said insulating substrate 1 is installed to said resin board 3 while the resistor section 1a is positioned on the outside, the case 7 is set up to the insulating substrate 1 while the slider 6 is abutted against the resistor section 1a, the terminals 4 and the electrode sections 1b are bonded, and the resistor section 1a, to which at least high voltage is applied, and the bonding sections of the electrode sections 1b, to which high voltage is applied, and the terminals 4 are covered with a resin 8.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a high-voltage variable resistor used for adjusting the focus voltage of color television.

2. Description of the Related Art The above-mentioned conventional high voltage variable resistor will be explained based on the drawings.

Fig. 6 is a sectional view of a conventional high voltage variable resistor, Fig. 7 is an assembly diagram of a conventional high voltage variable resistor, and Figs. 8 (a) and (b) are respectively of a conventional high voltage variable resistor. FIG. 2 is a plan view and a cross-sectional view of an insulating case.

The high-voltage variable resistor has a slider 11 mounted on the head, an operating shaft 12a1t (l! An insulating substrate 13 having an electrode portion 13b formed thereon, a terminal 14 connected to the electrode portion 13b of the insulating substrate 13, and one end having an opening shape and a flyback transformer C or lower, FB
It has a rib 15a for fitting with the case (abbreviated as T), and an operating shaft 12 of the knob 12 on the inner bottom. The insulating case 15 has a through hole 15b for inserting the insulating board 13, and a stepped portion 15C at a position of the insulating substrate 13 that abuts the off-road station.

Next, a method of assembling the high voltage variable resistor having the above structure will be explained.

First, the operation shaft 12a is rotatably inserted into the through hole 15b,
After that, in order to fix the insulating substrate 13 and seal the gap, an adhesive (not shown) or a rubber seal (not shown) is placed on the stepped portion Is (resistive body portion 13a of the insulating substrate 13).
The side provided with the insulating substrate 13 can be held with a jig to face the inside of the insulating case 15, or a dowel placed vertically from the bottom of the insulating case 15 can be passed through a through hole (not shown) provided in the insulating substrate 13 and the back of the head The insulating substrate 13 is fixed by crushing the insulating substrate 13, the terminals 14 are soldered vertically to the electrode portions 13b, and a flexible and highly insulating resin is injected and hardened over the entire back surface of the insulating substrate 13. Then, a resin layer 16 is formed.

Furthermore, in order to particularly improve the external quality with respect to high voltage, a part of the high voltage side resistor section 13a or the electrode section 13
It is also common to have a structure in which the stepped portion 15C of the portion facing b is bent inward so that a part of the resistor portion 13H and the electrode portion 13b are placed outside the rib 15a, and then molded with the resin. It is being done.

After the variable resistor is assembled in this way, it is fitted to the FBT case using the fitting rib 15a, and after bonding, it is molded together with the internal components of the FBT using a hard resin with good moisture resistance. be done.

Problems to be Solved by the Invention However, in the high-voltage variable resistor configured as described above, the insulation between the internal live-current part and the outside world is mostly left even if resin is injected into some of the high-voltage parts. Since it depends only on the case 15, it is easily affected by deterioration of the material of the case 15, stress during assembly, etc., and even if a huge amount of y7 is required, it will be difficult to use.

Furthermore, in response to requests from users to increase electrical power or change appearance specifications, it is necessary to manufacture a uniform insulating case 15 for each item, making it impossible to standardize the product and creating a large economic burden in terms of total mold manufacturing costs and production management. There was a problem. In addition, in production, it is difficult to automate the process because the product has a uniform external shape, which makes it difficult to provide inexpensive products with excellent characteristics to users.

The present invention solves the above-mentioned problems, and aims to provide a high-voltage variable resistor that has a simplified structure, can be designed in a short time, and its reliability can be confirmed, and is inexpensive and highly reliable. be.

Means for solving the problems In order to solve the above problems, the high voltage variable resistor of the present invention has the following features:
an insulating substrate having a resistor portion and an electrode portion connected thereto formed on its surface; a resin plate having a rib formed thereon that contacts the outer periphery of the path of the insulating substrate; terminals connected to the electrode portion; one end being open. The cap-shaped case has a through hole at the bottom, and a rotary shaft equipped with a slider that slides on the resistor part is rotatably attached to the through hole, and the resistor body is attached to the resin plate. The insulating substrate is attached with the portion facing outward, the case is attached to the insulating substrate with the slider in contact with the resistor portion, and after the terminals and the electrode portion are connected, at least a high voltage is applied. The resistive body part and the connecting part between the electrode part to which a high voltage is applied and terminals are covered with resin, or the resistive body part to which a high voltage is applied, the electrode part to which a high voltage is applied and the terminals. The connecting portion side of the terminals is thick, and the connecting portion side of the resistor portion to which a low voltage is applied and the electrode portion and terminals to which a low voltage is applied is thinly covered with resin.

Function As mentioned above, instead of consolidating all functions in an insulating case as in the past, we separated them by function, and created a cap-shaped case that holds a rotating shaft with a slider, and a flexible case that holds an insulating substrate. By using a resin plate that blocks the stress of FBT @ fat instead of a plastic resin, and a resin layer that covers the live current part and ensures insulation from the outside, it is possible to avoid increases in input voltage, which are often requested by users. When changing the output voltage ratio, it is only necessary to change the arrangement and mounting of the resistor portion formed on the insulating substrate, and since the same cap-shaped case and resin plate are used, standardization can be achieved. Furthermore, by increasing the thickness of the resin layer according to the input voltage, insulation from the outside is ensured, and quality confirmation becomes extremely easy.

Example An embodiment of the present invention will be described below based on the drawings.

FIG. 1 is an assembly sketch of a high voltage variable resistor showing an embodiment of the present invention.

The high-voltage variable resistor of the present invention includes an insulating substrate 1 having a resistor 1a and an electrode part 1b connected to the resistor 1a formed on the surface thereof, and a terminal insertion hole 2 formed in the center of the electrode part 1b, as shown in FIG. As shown in FIG. 1, a rib 3a is formed which is one size larger than the insulating substrate 1 and comes into contact with the outer periphery of the insulating substrate 1, and a rib 3c for fitting with the FBT is formed on the opposite side to the surface into which the insulating substrate 1 is inserted.
Further, a terminal hole 3b is provided at a position opposite to the terminal insertion hole 2 of the electrode portion 1b, and an arm 7 of a bearing cap 7, which will be described later.
A resin plate 3 is provided with a through-hole 3d through which C passes through, and a terminal 4 is inserted through the terminal hole 3b of the resin plate 3 and the terminal insertion hole of the electrode part 1b and connected to the electrode part 1b by means such as soldering. , an operating shaft (rotating shaft) 5 having a slider 6 on the head that slides on the resistor la, and an operating shaft 5 as shown in FIG.
The bearing cap 7 has a bearing 7a for rotatably holding it, and a through hole 7b at the bottom.It is a case with a corpse-mouth shape, and a bearing cap 7 is provided with an arm 7c on the side for fixing it to the resin plate 3. It is considered a component. And the high voltage variable resistor is
These components are assembled, that is, the insulating substrate 1 is attached to the resin plate 3 with the resistor ta on the outside, and the arm 7c of the bearing cap 7 into which the operating shaft 5 is inserted is passed through the through hole 3d of the resin plate 3 and hooked. , After applying adhesive for sealing to the gap with the insulating substrate 1 and the hook part of the arm 7C and solidifying it, and further connecting the terminal 4 and the electrode part 1b,
As shown in FIG. 2, a part of the resistor 1a and the electrode part 1b
The connecting portion between the terminal 4 and the terminal 4 may be covered with a moisture-resistant resin layer 8, or the resistor 1a to which a high voltage is applied as in the third factor.
A part of the resistor 1a to which a low voltage is applied, a part of the resistor 1a to which a low voltage is applied, and a connection part between the electrode part 1b and the terminal 4 to which a low voltage is applied. part is covered with a thin resin layer 8.

The high-voltage variable resistor configured in this manner is wired within the FBT and then sealed together with the internal components of the FBT in a molded resin.

By configuring the high voltage variable resistor as described above,
In order to increase the input voltage and change the output voltage ratio, which are the most frequently requested changes by users, it is sufficient to change the arrangement and configuration of the resistor ta formed on the insulating substrate 1, and the resin plate 3 as an insulating case can be changed. There is no need to make any changes, and since the outer diameter of the variable resistor portion is the same, the same bearing cap can be used, so these parts can be standardized.

In addition, especially in response to increases in input voltage, as the voltage increases, the amount of injected resin can be increased to make the resin layer 8 thicker, and the insulation properties also depend on the characteristics of the resin and the thickness of the resin layer 8. Since the quality is determined, quality confirmation becomes extremely easy. Furthermore, even if the electrical specifications are the same, there is no need to design or manufacture the resin plate 3 even if the external shape or shaft position needs to be changed due to mechanical design reasons on the set side, making it extremely easy and quick to manufacture the product. and quality confirmation.

As mentioned above, since there is no need to design and manufacture complicated resin plates 3 for each type of product, it is possible to reduce the human burden required for design and quality confirmation, reduce mold manufacturing costs, and improve manufacturing efficiency by standardizing. However, it can be easily mechanized. Furthermore, the exterior insulation, which is the most important point in terms of reliability, can be guaranteed uniformly for the entire resistor.

Note that the method of fixing the bearing cap 7c and the resin plate 3 is not limited to the method using the arm 7c, but may be any commonly used method (for example, dowel tightening).

Effects of the Invention As described above, according to the present invention, when changing the input voltage or output voltage ratio, it is only necessary to change the arrangement and configuration of the resistor portion formed on the insulating substrate. Since the same thing can be used, standardization can be achieved, and even if the external shape or shaft position needs to be changed, there is no need to change the resin plate that is the insulating case, making it extremely easy and short. Productization and quality 1III certification can be performed. In addition, it is possible to cope with an increase in the input voltage by changing the thickness of the resin layer, and the quality can be checked very easily. Furthermore, since there is no need to change complicated resin plates for each product type, the human burden required for design and quality confirmation, as well as mold production costs, can be reduced.Furthermore, standardization allows for easier mechanization of manufacturing. I can do it.

Furthermore, the exterior insulation, which is the most important point in terms of reliability, can be guaranteed uniformly for the entire resistor.

[Brief explanation of drawings]

Fig. 1 is an assembly diagram of a high voltage variable resistor showing an embodiment of the present invention, Figs. 2 and 3 are sectional views of the same high voltage variable resistor, and Figs. 4 (a) to (c). 5 is a plan view, a side view, and a cross-sectional view of the cap-shaped case of the high-voltage variable resistor, respectively, and FIG. Figure 6 is a sectional view of a conventional high-voltage variable resistor, Figure 7 is an assembly diagram of a conventional high-voltage variable resistor, and Figures 8 (a) and (b).
are a plan view and a sectional view, respectively, of a conventional high voltage variable resistor. l... Insulating substrate, 1a... Resistor, 1b... Electrode part, 3... Resin plate, 3a... Rib, 4... Terminal,
5... Operating shaft (rotating shaft), 6... Slider, 7...
Bearing cap (cap-shaped case), 7a...Bearing, 7b-...Through hole, 8...Resin layer.

Claims (2)

[Claims] 1. an insulating substrate having a resistor portion and an electrode portion connected thereto formed on its surface; a resin plate having a rib formed thereon that contacts the outer periphery of the path of the insulating substrate; terminals connected to the electrode portion; one end having an open end. The cap-shaped case has a through hole at the bottom, and a rotary shaft equipped with a slider for sliding the resistor part is rotatably attached to the through hole, and the resistor part is attached to the resin plate. the insulating substrate is attached to the outer side, the case is attached to the insulating substrate with the slider in contact with the resistor section, and after connecting the terminals and the electrode section, at least a resistor to which a high voltage is applied is attached. A high-voltage variable resistor that is constructed by covering the body and the joint between the electrode and terminals to which high voltage is applied with resin. 2. The resistor part to which a high voltage is applied, the electrode part to which a high voltage is applied, and the terminals are thicker, and the resistor part to which a low voltage is applied, the electrode part to which a low voltage is applied, and the terminals are thicker. 2. The high voltage variable resistor according to claim 1, wherein the connecting portion side is thinly covered with resin.