JPS6025844Y2 - variable resistor - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a variable resistor.

In recent years, in small audio equipment sets such as car stereos,
With the progress of miniaturization and multi-functionality, the variable resistors used therein are also required to be smaller and multi-functional.

On the other hand, the knobs used to operate the variable resistor are not necessarily small, but tend to be larger, due to the relationship with the set design, and the rotational torque required for the variable resistor is There is a strong desire for heavier characteristics such as.

As a rotary variable resistor that meets such market demands, there is a conventional rotary variable resistor shown in FIG.

That is, in this two-axis type variable resistor, the resistor main body is composed of a front stage block A and a rear stage block B, which are rotated by concentric outer shafts 2 and inner shafts 3, which are respectively fitted and supported by bearings 1. .

Block A is a single-acting variable resistor, and is mounted on an extension of the outer shaft 2, holding an insulating substrate 5 having a resistance layer 4 on its surface and a slider 6 that rotates and slides on the resistance layer. The resistance layer 4 and the slider 6 are electrically connected through the slider mounting plate 7, and terminals 8, 8' and 8'' are attached to the ends of the insulating substrate 5, and the whole is enclosed in an insulating casing made of molding material or the like. It is surrounded and held by body 9.

Block B is a double variable resistor, and its components are the same as block A: a pair of insulating substrates 12.13 having a resistance layer 10.11 on the surface, and a resistance layer 10 of this substrate 12.13.
．． a slider mounting plate 16 that holds sliders 14 and 15 that rotate and slide on sliders 11 and is mounted on an extension of the inner shaft 3;
Terminals 17 attached to the ends of each board 12.13
, 17', 17'', 18.18', 18'' and an insulating casing 19 that surrounds and holds them.

These blocks A and B are stacked one on top of the other and held together by a connecting fitting 20 connected at the base of the bearing 1.

By the way, the outer shaft 2 of the block A is coated with grease applied to the fitting part between the bearing 1 and the outer shaft 2, the elastic force of the contactor 22 attached to the terminal 8' of the insulating board 5, and the slider mounting plate 7. The structure has a rotating torque due to the pressure of the slider 6 attached to the slider.

In addition, the block B is controlled by the pressure of the contacts 21 attached to the fitting portion 3' of the outer shaft 2 and the inner shaft 3 and the substrates 12 and 13 with terminals 17' and 18', and the pressure of the contacts 21 attached to the slider mounting plate 16. The structure has rotational torque due to the pressure of the sliders 14 and 15.

However, while the rotation torque of block A can be freely changed depending on the length of the fitting part of bearing 1 and outer shaft 2 and the grease used, block B has The structure is such that the cylindrical end portion 16a of the slider mounting plate 16 is inserted into the substrate 12 in order to center the slider mounting plate 16 with a small gap in the center hole 12'.

For this reason, the inner shaft 3 is supported at two points, and the rotational torque cannot be changed freely.Also, even when changing the material of the grease used, it is difficult to obtain satisfactory characteristics due to the temperature difference in the environment in which the set is used.

Therefore, an object of this invention is to provide a variable resistor that can improve rotational torque with a simple configuration.

An embodiment of this invention is shown in FIGS. 2 to 4.

That is, this variable resistor in the one shown in FIG.
Center support holes 2 are provided in the substrates 27 and 27' of the resistor body, respectively.
8.28' is bored, the cylindrical ends 29a and 29b of the slider mounting plate 29, which becomes a rotating body, are shaped into a tapered shape, and grooves 30 are provided at several places to provide elasticity. By sandwiching the slider mounting plate 29 between the substrates 27.27' facing each other through the insulating casing 19, the outer peripheral surfaces of the tapered cylindrical ends 29a and 29b are attached to the substrate 27.27'.
The inner peripheral edge corner portion of the center support hole 28, 28' is brought into pressure contact with the center support hole 28, 28', thereby increasing the rotational torque of the inner shaft 3.

The rest of the structure is the same as that in FIG.

As described above, the variable resistor of this invention has a cylindrical casing, a pair of resistance boards each having a support hole in the center, and each of which is attached to the openings at both ends of the casing so as to face each other. A resistor body consisting of a resistor body and a pair of resistor boards facing each other through the casing are sandwiched, and the peripheral surfaces of tapered cylindrical parts protruding from the center of both ends are pressed against the inner periphery of the support hole, respectively. Since the structure includes a rotating body that rotates the slider that slides on the resistance board, compared to changing the material of the grease or changing the length of the shaft fitting part, fluctuations in rotational torque due to the environmental temperature in which the set is used are small. During assembly, the center position of the slider mounting plate can be easily determined and torque can be improved.

Furthermore, the overall length of the variable resistor does not change at all, and the number of component parts and assembly man-hours also remain unchanged, making it extremely economical and practical.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional variable resistor, Fig. 2 is a sectional view of an embodiment of this invention, Fig. 3 is an exploded side view of its main parts, and Fig. 4 is a front view of its cylindrical end. be. A, B...Block (resistor body), 28,
28'...Central support hole, 29...Slider mounting plate (rotating body), 29a, 29b...Taber cylindrical end.

Claims (1)

[Scope of utility model registration request] A resistor main body consisting of a cylindrical casing and a pair of resistor boards each having a support hole in the center and respectively attached to openings at both ends of the casing so as to face each other; and the casing. The circumferential surfaces of tapered cylindrical portions, which are sandwiched between a pair of resistor boards facing each other and protrude from the center of both ends, are pressed against the inner peripheral edge of the support hole, respectively, and rotate a slider that slides on the resistor boards. A variable resistor equipped with a rotating body.