JPH0442882Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The invention relates to a variable resistor whose resistance value is varied by rotating a support shaft, and particularly relates to a variable resistor whose resistance value is varied by rotating a support shaft, and in particular to an intermediate terminal plate electrically connected to a sliding contact. adheres stably to the base,
The present invention also relates to a variable resistor that can prevent rotational displacement of an intermediate terminal plate due to rotation of a support shaft.

[Conventional technology]

FIG. 7 (side view) and FIG. 8 (bottom view) show conventional examples of semi-fixed variable resistors.

In this semi-fixed variable resistor, a resistor (not shown) is formed in an arc shape on the surface of a base 1, and a support shaft 2 is inserted through the center of the resistor. An operating body 4 is fixed to the upper part of the support shaft 2, and a sliding contact that slides on the resistor is incorporated inside the operating body 4. A flange 2a is formed at the lower end of the support shaft 2. This flange 2a
Alternatively, by rotating the operating body with a screwdriver or the like, the sliding contact moves over the resistor, and a desired resistance value is set. Regulation of the rotation angle of the operating body 4 is as follows:
The engaging portion 2b of the flange 2a that protrudes in the radial direction hits the stepped portion 1a of the base 1, thereby being regulated.

Further, numerals 5 and 6 are external connection terminals. Terminal 5 is connected to the resistor. Further, the terminal 6 is an intermediate terminal, and is formed integrally with an intermediate terminal plate arranged at the bottom of the base 1. As shown in FIG. 7, the intermediate terminal plate integral with the terminal 6 is deformed into a concave curve, and the flange 2a of the support shaft 2 is elastically supported by this curved portion.

[Problems with the prior art] In the above conventional example, as shown in FIG.
An intermediate terminal plate integral with the base 1 is arranged to be biased toward the left side in the drawing with respect to the bottom of the base 1. Therefore, the elastic reaction force against the flange 2a of the support shaft 2 acts in a biased state. Therefore, not only is the close contact between the intermediate terminal board and the base unstable, but also the operational feel when rotating the support shaft 2 is poor. Also, depending on how force is applied during the rotation operation, slippage may easily occur between the intermediate terminal plate and the base 1, or the elastic resistance of the intermediate terminal plate may become excessive, causing the operating shaft 2 to This has the drawback that the rotational resistance becomes too large, making it difficult to operate.

The present invention has been made in view of the above-mentioned conventional problems, and provides a variable resistor in which the intermediate terminal plate can be stably brought into close contact with the base, and a stable operation feeling of the support shaft can be obtained. The purpose is to

[Means for solving problems]

The variable resistor according to the present invention includes a base on which a resistor is formed, a support shaft rotatably supported by the base, and a support shaft that rotates together with the support shaft and slides on the resistor. A sliding contact that is in contact with the sliding contact is sandwiched between the base and the head of the support shaft on the opposite surface of the base to the surface on which the resistor is formed, and is connected to the sliding contact via the support shaft. A conductive intermediate terminal board is provided, and the intermediate terminal board is provided with a protrusion that is elastically deformably bent toward the base, and the protrusion is inserted into the groove formed in the base. The intermediate terminal board is provided with a pair of elastically deformable protrusions that contact the base, and the pair of protrusions are arranged on the opposite side of the protrusion with respect to the support shaft, and each protrusion are characterized in that they are arranged at equal positions on both sides of the line connecting the support shaft and the protrusion.

[Effect]

In the above means, since the protrusion and the pair of protrusions are provided on the intermediate terminal board in an even arrangement relationship, the intermediate terminal board is pressed against the base at these three points with uniform elastic force. Therefore, when the support shaft is rotated, the elastic reaction force by the intermediate terminal plate is uniformly applied to the head of the support shaft, providing a good operating feel. In addition, the protrusions on the intermediate terminal plate can also be elastically deformed, and since they face the grooves of the base, the protrusions not only have the function of elastically pressing against the base, but also prevent the intermediate terminal plate from rotating. It can also perform the functions of

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings of FIGS. 1 to 6.

Fig. 1 is a sectional view of the semi-fixed variable resistor, Fig. 2 is a plan view of the semi-fixed variable resistor, Fig. 3 is a bottom view of the semi-fixed variable resistor, and Fig. 4 is an exploded perspective view of the support shaft.
FIG. 5 is a perspective view of the support shaft, and FIG. 6 is an exploded view of the semi-fixed variable resistor.

The semi-fixed variable resistor 10 includes a support shaft 14, an intermediate terminal plate 13, a base 11, an insulating substrate 12, and an operating body 15.

The base 11 is a resin molded product. A protrusion 11f is formed on one side of the bottom 11e of the base 11. A rising portion 11 forming a stepped portion of this protrusion 11f
As shown in FIG.
The engaging portion 14a of the support shaft 14 is engaged, and the rotation angle of the support shaft 14 is regulated. Furthermore, a groove 11h is carved in the center of this protrusion 11f.

On the other hand, a recess 11a is formed on the upper surface of the base 11. A hole 11b is bored in the center of this recess 11a. A boss 11c is bored on the bottom surface 11d of the recess 11a and around the hole 11b. The tips of the terminals 5a and 5b are exposed inside this recess 11a. These terminals 5a and 5b are outsert molded on the base 11,
It extends downward from the protrusion 11f.

Furthermore, another protrusion 11 is provided at the upper end of this base 11.
i is formed. As shown in FIG. 2, a rising portion 11j forming a stepped portion of the protrusion 11i is hooked to both ends 15d of an engaging portion 15a formed on the operating body 15, which will be described later, so that the rotation angle of the operating body 15 is adjusted. Regulated.

Reference numeral 12 is an insulating substrate made of ceramic or the like. On the surface of this insulating substrate 12, a resistor 12a is formed in a semicircular arc shape. A hole 12b is bored in the center of this resistor 12a.
This insulating substrate 12 is fixed to the bottom surface 11d of the recess 11a, and the hole 12b fits into a boss 11c formed on the bottom surface 11d. Furthermore, the tips of the terminals 5a and 5b are connected to both ends of the resistor 12a, respectively.

Reference numeral 13 is an intermediate terminal plate. In this intermediate terminal plate 13, the spring plate portion 13a and the connecting terminal 13d are L.
It is formed by being bent in the shape of a letter. A protrusion 13b is formed at the tip of this spring plate portion 13a. As shown in FIG. 1, this protrusion 13b is
It is bent and molded so that it can be elastically deformed diagonally upward. Arc-shaped slits 13c are bored on both sides of the connecting terminal 13d provided on the opposite side of the protrusion 13b. A projection 13e projecting upward is formed on the outside of this slit 13c. This protrusion 13e is formed by a slit 13c in the spring plate portion 1.
3a is elastically supported. Further, a hole 13f is bored approximately in the center of this spring plate portion 13a.

Reference numeral 14 is a support shaft. This support shaft 14 is
As shown in FIG. 4, two discs 14b and 14
c is made of a single plate connected via the neck 14d. An engaging portion 14a is formed on the outside of one of the discs 14b. This engaging portion 14a is a rising portion 11 formed on the protrusion 11f of the base 11.
It is hung on g. Further, a rivet 14e is integrally formed at the center of the other disc 14c. Further, a slit 14f extending toward the neck 14d is bored in the center of the disc 14b. This slit 14f allows a flathead screwdriver to be attached. Note that this support shaft 14 is made of a conductive material.

Reference numeral 15 indicates an operating body made of a resin molded product. The head of this operating body 15 has a cross recess 15 for attaching a driver.
b is formed. A hole 15c is bored in the center of this cross recess 15b. Furthermore, a slider 16 is outsert molded at the lower part of the operating body 15. A portion of this slider 16 is exposed within the hole 15c. Furthermore, a sliding contact 16a is formed on this slider 16. This sliding contact 16
a is a resistor 12 formed on the insulating substrate 12;
It comes into sliding contact with a.

Further, an engaging portion 15 is provided on the outer periphery of the operating body 15.
a is formed. This engaging portion 15a is the hole 15
It is formed into a fan shape centered at c.

Both the operating body 15 and the support shaft 14 have the same rotation range. That is, when both ends 15d of the operating body 15 are hooked to the rising portion 11j of the base 11, the engaging portion 14a of the support shaft 14 is also hooked to the rising portion 11g of the base 11 at the same time.

Next, a procedure for assembling the semi-fixed variable resistor 10 having the above configuration will be explained.

First, the insulating substrate 12 is fixed to the bottom surface 11d of the recess 11a formed in the base 11. At this time, the hole 12b of the insulating substrate 12 is fitted into the boss 11c formed in the recess 11a, and the insulating substrate 12
One end of the insulating substrate 12 is brought into contact with the side wall of the recess 11a, and rotation of the insulating substrate 12 is restricted. Then, the ends of the terminals 5a and 5b are connected to both ends of the resistor 12a formed on the insulating substrate 12.

Next, the operating body 15 is inserted into the recess 11a from above.
Attach. At this time, the lower end of this operating body 15 comes into contact with the boss 11c.

The bottom part 11e of the base 11 has a protrusion 13b and a protrusion 13 formed on the spring plate part 13a of the intermediate terminal plate 13.
make contact with e. At this time, the protrusion 13b faces the groove 11h carved in the protrusion 11f of the base 11. This restricts the rotation of the intermediate terminal board 13.

The intermediate terminal board 13, the base 11,
Holes 13f and 11 bored in the operating body 15, respectively
The rivet 14e of the support shaft 14 is inserted from below through the holes b and 15c. This support shaft 14 connects two discs 14b and 14c to the neck 14 as shown in FIG.
The discs 14b are bent at the center and placed one on top of the other, and the slits 14f formed in the disc 14b are located on the bottom surface of the disc 14c.

Next, the operating body 15 and the support shaft 14 are aligned. The engaging portion 14a of the support shaft 14 is brought into contact with the rising portion 11g of the base 11, and at the same time both ends 15d of the engaging portion 15a formed on the operating body 15 are brought into contact with the rising portion 11j of the base 11. (Second
Fig. 3). By this, the support shaft 1
4 and the operating body 15 have the same rotation range.

Then, attach the tip of this rivet 14e to the operating body 1.
The slider 16 exposed in the hole 15c of No. 5 is caulked. Then, the rivet 14e and the operating body 15 are integrally connected via the slider 16. Further, the slider 16 and the intermediate terminal plate 13 are electrically connected via the rivet 14c. Further, the intermediate terminal plate 1 interposed between the bottom portion 11e and the support shaft 14
An elastic force is generated in the protrusion 13e and the protrusion 13b of No.3. Due to this elastic force, the sliding contact 16a of the slider 16 is brought into elastic contact with the resistor 12a on the insulating substrate 12, and the operating body 15 and the support shaft 14 are caused to rattle against the base 11. It can be assembled without any trouble.

Next, the operation of the semi-fixed variable resistor 10 assembled in this way will be explained.

Cross recess 15a of operating body 15 or support shaft 1
After engaging the driver with the slit 14f of No. 4,
When this driver is rotated by a predetermined angle, the operating body 1
5 rotates, and the sliding contact 16a of the slider 16 slides on the resistor 12a formed on the insulating substrate 12. Then, a resistance value is set between the connecting terminal 13d of the intermediate terminal plate 13 that is electrically connected to the slider 16 and the terminals 5a and 5b that are connected to the resistor 12a.

This resistance value is set by the rotation angle of the operating body 15. At the maximum or minimum rotation angle position of the operating body 15, the engaging portion 1 formed on the operating body 15
5a and the engaging portion 14a of the support shaft 14 are connected to the base 11.
The projecting portions 11i and 11f are engaged with both the rising portions 11j and 11g formed on the upper and lower surfaces of the holder. Therefore, since the rotational torque generated on the operating body 15 or the support shaft 14 is received at two locations, the rotation angles thereof are reliably regulated.

During this time, the projections 13e and ridges 13b of the intermediate terminal plate 13 are pressed against the bottom of the base 11 at three equal points relative to the center of rotation of the support shaft 14. This elastic force applies appropriate rotational resistance to the operating body 15,
There is no slippage and the operating feel is good.

Although the support shaft 14 in the illustrated embodiment is formed by bending a flat plate, the support shaft 14 may be formed integrally in advance.

〔effect〕

As described above, according to the present invention, the protrusions formed on the intermediate terminal board and the pair of protrusions touch the bottom of the base, so that the intermediate terminal board is sandwiched between the head of the support shaft and the base. adheres to the base with uniform elastic force. Therefore, the elastic reaction force acting on the head becomes appropriate, and the rotation operation of the support shaft that rotates together with the head provides a good feeling. It is also possible to prevent the rotational load acting on the head from becoming too large and making it difficult to rotate the support shaft. In addition, since the protruding stripes of the intermediate terminal plate face the groove of the base, this serves as a stopper mechanism to prevent the intermediate terminal plate from shifting when the support shaft is rotated. Moreover, the protrusion that performs this stopper function is one of the three pressure points against the base. In this way, by making the protrusion function not only as a stopper but also as a pressure point, other protrusions can be arranged at equal positions with this protrusion as the center. Therefore, the elastic force of the intermediate terminal plate does not become uneven with respect to the base due to the provision of a rotation stopper as in the conventional case.

[Brief explanation of the drawing]

1 to 6 show an embodiment of the present invention. FIG. 1 is a cross-sectional view of a semi-fixed variable resistor. FIG.
The figure is a plan view of the semi-fixed variable resistor, Fig. 3 is a bottom view of the semi-fixed variable resistor, Fig. 4 is an exploded perspective view of the support shaft, Fig. 5 is a perspective view of the support shaft, Fig. 6 is an exploded view of the semi-fixed variable resistor, Figs. 7 and 8 show a conventional example, Fig. 7 is a side view of the semi-fixed variable resistor, and Fig. 8 is a bottom view of the semi-fixed variable resistor. 10 ... semi-fixed variable resistor, 11 ... base, 1
1g, 11j ... step portion, 12a ... resistor, 14
...Support shaft, 14a, 15a...Engagement portion, 15...
...operating body, 16a...sliding contact.

Claims (1)

[Scope of utility model registration request] a base on which a resistor is formed; a support shaft rotatably supported by the base; a sliding contact that rotates together with the support shaft and slides into contact with the resistor; and a base. an intermediate terminal plate which is sandwiched between the base and the head of the support shaft on a surface opposite to the surface on which the resistor is formed and is electrically connected to the sliding contact via the support shaft; The intermediate terminal board is provided with a protrusion that is elastically deformably bent toward the base, and the protrusion faces into a groove formed in the base; The plate is provided with a pair of elastically deformable protrusions that contact the base, and the pair of protrusions are arranged on the opposite side of the support shaft from the protrusion, and each protrusion is arranged so that the support shaft and the protrusion are in contact with each other. A variable resistor characterized by being placed at equal positions on both sides of the connecting line.