JPS5818244Y2 - variable resistor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a variable resistor suitable for use in a focus voltage adjustment circuit of a television receiver, for example.

Conventional variable resistors for focus adjustment are made by forming a variable resistance region and a fixed resistance region with a resistance film on an insulating substrate, bringing a movable contact into contact with the variable resistance region, placing the substrate in a container, and injecting resin. , is formed by fixing the substrate to the container with resin.

By the way, in this type of variable resistor, it is necessary to provide a terminal pin that is electrically connected to the resistance of the board, so conventionally, a terminal pin was soldered to the terminal part provided in the through hole part of the board. The terminal pins were not attached to the board by gluing them.

Even if the terminal bins are provided in this manner, it is possible to obtain a variable resistor as required.

However, attaching the terminal bin to the board is troublesome, leading to an increase in the cost of the variable resistor.

The work of fixing a large board to a container with resin was also troublesome and caused an increase in costs.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a variable resistor having a structure in which a terminal bin can be easily attached and an insulating substrate can be easily fixed to a container.

The present invention to achieve the above object will be described with reference to the reference numerals in the drawings showing the embodiments for easy understanding.
a container 1; an insulating substrate 2 housed in the container 1 having a through hole 19 extending from one principal surface 16 to the other principal surface 21; and a variable insulating substrate 2 provided on one principal surface 16 of the substrate 2. a resistance film 11 for resistance, a movable contact 25 that contacts the resistance film 17 for variable resistance, a shaft 24 that is supported by the container 1 and operates the movable contact 25, and at least the other side of the substrate 2. An electrode member 22 provided around the through hole 19 on the main surface 21 and inside the through hole 19, and fixing, for example, in an embodiment that electrically connects the electrode member 22 and the resistive film 7. A connecting portion consisting of a resistance film 18 for resistance and a wiring conductor 20, and a screw head 28 having a screw portion 21 at one end and protruding in the radial direction at an intermediate portion.
The threaded portion 21 passes through the through hole 19 and is fixed to the container by screwing, and the screw head 28 is attached to the through hole peripheral portion 30 on the other main surface 21 of the electrode member 22.
The present invention relates to a variable resistor characterized in that it includes a metal terminal pin 3 that is pressed into contact with the substrate 2 and presses and fixes the substrate 2 in the direction of the container 1.

According to the above invention, the pin terminal 3 is provided with the screw portion 27 and the screw head 28, and the terminal pin 3 is fixed to the container 1 using the screw portion, so that the terminal pin 3 can be easily attached. can do.

In addition, electrical connection is achieved by pressing the screw head 28 against the other through-hole peripheral portion 30 of the electrode member 22, which simplifies the electrical coupling configuration.

Since the board 2 can be fixed to the container 1 by pressing the screw head 28 of the twisted terminal pin 3 against the board 2,
Mechanical coupling of the substrate 2 to the container 1 can be easily achieved.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

1 to 5 show a focus adjustment variable resistor for a television receiver according to an embodiment of the present invention.

The variable resistor according to this embodiment is constructed by connecting the container 1 shown in FIGS. 1 to 3 and the insulating substrate 2 shown in FIG. 4 with metal terminal pins 3 as shown in FIG. Configure.

Regarding the container 1 shown in FIGS. 1 to 3,
In the center of the synthetic resin container 1 is a resistance adjustment shaft insertion hole 4.
A first substrate surface 5 is provided to surround this, and a second surface 6 is further provided to surround the first surface 5.

As is clear from FIGS. 2 and 3, the first surface 5
A first space 8 is formed surrounded by a wall 7, and a second
The surface 6 is surrounded by a second wall 9 to form a second space 10.

At the boundary between the second surface 6 and the first wall 7, a projection 11 is provided for positioning an O-shaped valvular ring for sealing and for a stop.

That is, in this embodiment, there is a protrusion 1 at the boundary between the two sides in the longitudinal direction.
1 are provided respectively.

A stepped portion 12 provided to surround the shaft insertion hole 4 is a portion into which an O-shaped valve ring is inserted to improve airtightness between the shaft and the container 1.

Reference numeral 13 denotes a metal insert that functions as a nut portion during screwing, and has a screw hole 14.

As is clear from FIG. 1, the metal insert 13 serving as the nut portion is embedded in the container 1 at three locations on the second surface 6.

15 is a shaft rotation stopper. As is clear from FIG. 5, the ceramic insulating substrate 2 shown in FIG.
It is formed in a size that can be inserted into the second space 10 of the substrate, and one substrate surface 16 is provided with a resistance film 17 for variable resistance and a resistance film 18 for fixed resistance made of, for example, ruthenium oxide.

Three through holes 19 are also provided, and the resistive coating 17.18
is connected to the through hole 19 by a wiring conductor 20.

As is clear from FIG. 5, the through hole 19 is formed by an eyelet-shaped metal electrode member 22 extending from one substrate surface 16 to the other substrate surface 21.

The electrode member 22 is attached to one substrate surface 16 around the through hole 19.
Since it is mounted so as to cover the other substrate surface 21, electrical connection with the wiring conductor 20 can be easily achieved.

When fixing the substrate 2 shown in FIG. 4 to the container 1 shown in FIGS. 1 to 3, first, as shown in FIG. The valve ring 23 is arranged and the shaft 24 is inserted into the shaft insertion hole 4.

In addition, a movable contact 2 that can be elastically deformed is attached to the head of the shaft 24.
Attach 5.

Next, as shown in cross section in FIG. 5 and as shown by the chain line in FIG. 1, an elastic ring 26 for a substantially 0-shaped seal made of rubber such as silicone, nitrile plastic, or ethylene propylene is placed to surround the space 8. and attach the insulating substrate 2 to the elastic ring 2.
Place it on top of 6.

Thereafter, the threaded portion 27 of the terminal pin 3 is passed through the through hole 19 and screwed into the threaded hole 14 of the insert 13.

Since the terminal pin 3 is provided with a flange-shaped screw head 28 that is larger than the through hole 19, as the terminal pin 3 is screwed in, the screw head 28 presses against the other board surface 21. The substrate 2 resists the elasticity of the elastic ring 26 to
approach surface 6 of

That is, the substrate 2 approaches the second surface 6 while deforming the elastic ring 26.

In this embodiment, the elastic ring 26 is formed to have a cross-sectional diameter of approximately 1.2 mm, and the protruding portion 11 is formed to protrude approximately 1 mm from the second surface 6, so that when the terminal pin 3 advances, the elastic ring 26 is After the ring 26 is elastically deformed by approximately 0.2 ymrt, the other substrate surface 21 abuts against the protrusion 11 of the container 1, making it impossible to lower the substrate 2 and screw in the terminal pins 3.

If the elastic ring 26 is deformed by about 0.2 mm, a sufficient sealing effect can be obtained, and the first space 8 inside the elastic ring 26 will be in an airtight state.

When fixing the substrate 2 to the container 1 as described above, the movable contact 25 is elastically deformed as the substrate 2 is lowered, and the spring force of the contact 25 pushes the shaft 24 downward as shown in FIG. be done.

Therefore, the elastic ring 2 between the shaft head and the step 12
3 is also slightly elastically deformed, and a seal between the shaft 24 and the container 1 is achieved.

Note that the elastic ring 23 also contacts the outer periphery of the shaft 24 and the vertical surface of the stepped portion 12, so that a better seal is achieved.

The electrode member 22 having a through hole has one through hole peripheral portion 29
and the other through-hole peripheral portion 30.

One of the through-hole peripheral parts 29 is directly connected to the wiring conductor 20, and the other through-hole peripheral part 30 is electrically connected to one of the through-hole peripheral parts 29 via the through-hole part.
The other through-hole peripheral portion 30 can be used as an electrode of a resistance circuit.

When the terminal pin 3 is screwed in, the screw head 28 comes into pressure contact with the other through-hole peripheral part 30, and the terminal pin 3 and the other through-hole peripheral part 30 are electrically coupled.

Therefore, in the assembled state shown in FIG. 5, the variable resistance resistance film 17 is electrically connected to the electrode member 22 having the through hole 19, and is also electrically connected to the terminal pin 3. .

As is clear from the above, according to this embodiment, since the terminal pin 3 is used for mechanically coupling the container 1 and the substrate 2, the device can be simplified and the cost of the device can be reduced. Become.

Furthermore, if the container 1 and the substrate 2 are mechanically connected using the terminal pins 3, an electrical connection between the terminal pins 3 and the circuit of the resistive film 17 is achieved. There is no need to solder the electrodes.

Therefore, electrical connection to the terminal bin 3 is facilitated,
It becomes possible to reduce the cost of the device.

Further, since it is not necessary to mechanically fix the terminal pin 3 to the board 2 using solder or the like, the arrangement of the terminal pin 3 becomes easier.

′-! Since the container 1 and the substrate 2 are bonded without using a synthetic resin, it is possible to reduce the material cost, and the resin curing time is not required, making manufacturing easier.

In this embodiment, a first space 8 is provided corresponding to the portion where the resistive films 17 and 18 are provided, and this is surrounded by an elastic ring 26, so that the first space 8 is airtight. has been almost completely achieved.

In this embodiment, the protruding part 11 is not provided in the area where the resistive film 18 and the wiring conductor 20 pass, so even if the protruding part 11 butts against the substrate 2, the resistive film 18 and the wiring conductor 20 are not disposed. There is no risk of damage.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment and can be further modified.

For example, if the container 1 is made of a material that allows the threaded portion 27 to be directly screwed into it, the screw hole 14 may be provided directly in the container 1 without using the insert 13, and the threaded portion 27 may be screwed therein. good.

An adhesive may be applied to the boundary area between the terminal pin 3 and the substrate 2 to prevent the twisted terminal pin 3 from rotating.

The container 1 and the substrate 2 may be bonded together using a synthetic resin as an auxiliary to the unwrapping.

Further, an adhesive may be interposed between the threaded portion 27 and the threaded hole 14 to further strengthen the connection.

Further, the electrode in the through hole 19 may be formed by coating a conductor or a resistor without using the electrode member 22 such as an eyelet.

The screw head 28 of the terminal pin 3 does not necessarily have to be in the shape of a flange, but a stepped portion may be provided so that the diameter of the portion where the terminal pin 3 is inserted into the through hole 19 is smaller than the diameter of the upper part of the terminal pin 3. It may also be something you have.

In short, the portion that presses the substrate 2 may have any shape.

The bent protrusion 11 may be formed to surround the entire first space 8.

The twisted elastic ring 26 may be arranged so as to surround the outside of the terminal pin 3.

[Brief explanation of the drawing]

Fig. 1 is an enlarged plan view of a container of a variable resistor according to an embodiment of the present invention, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is a sectional view taken along the line I-N in Fig. 1. 4 is a plan view of the substrate, and FIG. 5 is a sectional view of the completed variable resistor at a portion corresponding to the line 1--2 in FIG. 1. In the symbols used in the drawing, 1 is a container, 2 is an insulating substrate, 3 is a terminal pin, 11 is a protrusion, 13 is a metal insert, 14 is a screw hole, 17 is a resistance film for variable resistance,
18 is a resistance film for fixed resistance, 19 is a through hole, 22 is an electrode member, 26 is an elastic ring, 27 is a screw portion, 28 is a screw head, 29 is a periphery of one through hole, 30 is a periphery of the other through hole Department.

Claims (1)

[Claims for Utility Model Registration] A container 1; an insulating substrate 2 housed in the container 1 having a through hole 19 extending from one principal surface 16 to the other principal surface 21; and one of the substrates 2. A variable resistance film 11 provided on the main surface 16, and a movable contact 25 in contact with the variable resistance film 17.
a shaft 24 supported by the container 1 to operate the movable contact 25; and at least a peripheral portion of the through hole 19 on the other main surface 21 of the substrate 2 and an inside of the through hole 19. The electrode member 22 provided, a connecting portion for electrically connecting the electrode member 22 and the resistive film 7, and a screw head 28 having a threaded portion 27 at one end and protruding in the radial direction at an intermediate portion. and the threaded portion 27 is connected to the through hole 1.
9 and is fixed to the container by screwing, and the screw head 2
8 includes a metal terminal pin 3 that is pressed against a peripheral portion 30 of the through hole on the other main surface 21 of the electrode member 22 and presses and fixes the substrate 2 in the direction of the container 1. A variable resistor characterized by: