JPS6041694Y2 - variable resistor - Google Patents

Description

[Detailed description of the invention] The present invention relates to a variable resistor for stereo balance used to adjust the gain of both channels in a stereo receiver, etc. In the middle position of the adjustment range, crosstalk and both channels are reduced. In order to improve the gain and balance of the resistor, an insulating part is provided in the center of the resistor, and an articulated groove part that engages the contact protrusion of the slider that slides on the resistor is placed in the center of the resistor board. By providing the stereo balance variable resistor directly through it, the configuration of the stereo balance variable resistor is simplified and improved, and dielectric coupling due to stray capacitance is reduced.

As shown in FIG. 3, the horseshoe-shaped resistor 20 of the resistance board 2 of the variable resistor is divided at the center to form resistors 21 and 22,
A variable resistor for stereo balance in which only an insulating portion 23 is provided is known as shown in Japanese Utility Model Publication No. 10828/1983.

Further, in this type of variable resistor, a variable resistor configuration with a center point click is convenient and has been widely used by providing an adjustment mechanism so that the reference position for adjustment can be easily set.

However, the articulating mechanism structure of the conventional variable resistor with a click is such that a click spring is fixed to the operating shaft separately from the slider that slides on the resistor, and the click spring is inserted into the click hole provided in the resistor cover. A click feeling was obtained by engaging the click protrusions.

However, with this structure, it was difficult to obtain a product with good relative dimensional accuracy due to positional errors of the cover, click hole, slider, click protrusion of the click spring, and resistor, and fitting assembly errors during assembly. .

For this reason, the width of the insulating portion 23 has become wider than necessary.

In addition, the number of parts such as click springs increases, and the processing and assembly of these parts requires a lot of effort.

Here, as an improvement over the conventional technology, the Utility Model Publication No. 54-2 was developed for the purpose of improving and simplifying the accuracy of the click structure of a variable resistor.
Ideas such as Japanese Patent No. 1727 and Japanese Unexamined Utility Model Publication No. 53-25336 have been proposed.

In these, the click hole is provided on the outside of the resistor, and the engaging elastic spring is also in sliding contact with the outside of the resistor.

For this reason, the resistor becomes larger, or if the resistor is kept the same size, the resistor becomes smaller and performance deteriorates.

Furthermore, since the click action of the slider utilizes only one part of the plurality of sliding legs, the structure is complicated, there is a high risk of failure, and the click feel is sometimes unsatisfactory.

The present invention improves the above-mentioned drawbacks.

Embodiments of the present invention will be described based on the drawings. FIG. 1 is a vertical sectional assembly view of an embodiment of the variable resistor of the present invention, and FIG. 2 is a perspective view of the slider and shaft, except for the resistor substrate 2, which is constructed according to the conventional technology.

That is, 1 is a shaft made of a resin mold, 11 is a shaft operation part that protrudes outward from the center hole on the top surface of the dish-shaped metal case 5, and 12 is a part between the case 5 and a resistor board 2, which will be described later. The installed slider mounting part, 13 is a cylindrical shaft protruding below from the slider mounting part 12, 14 is its lower shoulder, 15 is a small diameter shaft at its tip, and the small diameter shaft 15 is a resistor. It is rotatably fitted into the center hole 25 of the substrate 2.

FIG. 3 is a plan view of the resistor substrate 2, and the resistor 20, which is made of carbon resin and has a horseshoe shape as a whole, is symmetrical and is formed by a known printing method.

The left and right semicircular resistor parts 21 and 22 are connected to one end of each, and a conductive terminal drawer part 21A made of silver thread conductive paint, etc.
22A is provided downward, and the external terminal mounting hole 21 is provided at the tip.
It is electrically connected to external terminals 4, 4 fixed to B and 22B.

A current collecting ring 26 made of a dielectric material formed by the same printing method is provided concentrically around the center hole 25, and a conductive terminal portion 26A connected to this is provided downward, and the external terminal mounting hole 26
It is electrically connected to the external terminal 4 fixed to B.

As shown in FIG. 3 and FIG. 4, which is a schematic cross-sectional view taken along line XX' in FIG. An insulating part 23 is provided, and a click groove 24 for clicking is provided in the center of the insulating part 23 passing through the resistor board 2 in the width direction of the resistor, and a click protrusion of one or more contact pieces 31 of the slider 3 is inserted onto the click groove 24. Dual-purpose sliding contact protrusion 3
One or more of the parts 2 are in sliding contact to perform the click joint operation.

Here, if the click groove 24 for the click is made longer than the width of the resistor 20, that is, the difference between the inner diameter and the outer diameter of the resistor, the insulation between the pair of resistor parts 21 and 22 can be improved and the stray capacitance can be reduced. I will do it.

Furthermore, conductive powder such as carbon or silver of the resin-based resistor material of the semicircular resistor parts 21 and 22 is applied to the contact piece 31 of the slider 3.
resistor 21.2 by transferring as it comes into sliding contact with
This will prevent the insulation between the two from deteriorating.

FIG. 2 is a perspective view of the shaft 1 equipped with a slider 3 made of an elastic conductive metal plate that slides on a resistor.
A plurality of contact pieces 31 having an elasticity of 1 and 2 slide on the resistors 21 and 22 of the resistor substrate, and another contact piece 36 slides on the ring-shaped current collector 26, respectively.

The slider 3 is attached to the shaft 1 through a hole 37 that engages with the fixing protrusion 17 of the slider attachment portion 12 of the shaft 1.

As described above, in the present invention, the click groove 24 for clicking, which is longer than the width of the resistor, is provided in the center of the insulating part 23 between the semicircular resistors 21 and 22, so that the center end of the resistor 21 and 22 is Compared to conventional methods, the click device for the part position is more accurate as there is no cumulative error in related parts and assembly.
Compared to the conventional structure described above, relative errors due to processing, assembly, etc. can be reduced.

Furthermore, the width of the insulating portion 23 in the slider movement direction can be made smaller compared to the above-mentioned conventional configuration in which errors in processing and assembly are large.

In addition, since the slider also serves as a click spring, there is no need to create a separate click spring or click holes in the case 5, etc., reducing the number of parts, which reduces processing and assembly man-hours and makes the entire variable resistor smaller. .

Furthermore, since the click groove 24 is longer than the width of the resistor, insulation between the semicircular resistors 21 and 22 is ensured, and crosstalk caused by stray capacitance is also improved.

Although the above description has been made regarding an embodiment of a rotary type variable resistor, the present invention can be widely used for other variable resistors such as a slide type variable resistor.

[Brief explanation of drawings]

FIGS. 1 to 3 show an embodiment of the present invention, FIG. 1 is a vertical cross-sectional assembly view, FIG. 2 is a perspective view of a shaft equipped with a slider,
Figure 3 is a plan view of the resistor board, Figure 4 is x-x in Figure 3.
'These are factors related to the slider in the cross section. 1: Shaft, 11: Shaft operation section, 12: Slider mounting section, 13: Cylindrical shaft section, 14: Cylindrical shoulder section, 15: Small diameter section, 17: Fixed protrusion, 2: Resistor board, 20: Resistor element ,2
1: Semicircular resistor, 22: Semicircular resistor, 21A: Conductive terminal drawer, 22A: Conductive terminal drawer, 21B: External terminal fixing hole, 22B: External terminal fixing hole, 23: Insulating part, 24:
Click groove, 25: center hole, 26: current collector section, 26A:
Current collector terminal drawer, 26B: External terminal fixing hole, 3: Slider, 31: Resistor contact piece, 32: Sliding projection of resistor contact piece, 36: Current collector contact piece, 37: Fixing hole, 4: External terminal,
4B: External terminal eyelet, 5: Case.

Claims (1)

[Scope of utility model registration request] The resistor 20 on the resistance board 2 of the variable resistor is divided into two parts at approximately the center of the entire movement range of the slider 3 to form a resistor part 21.
22, an insulating part 23 is provided between the two resistor parts, and the resistor board 2 is penetrated approximately in the center of the insulating part, and each of the opposing resistor parts 21 and 22 is inserted in the width direction of the resistor. A click groove 24 longer than the width of the end is provided, and when the click groove and the sliding protrusion 32 provided on the contact piece 31 of the slider 3 engage, the slider 3 is moved between the resistor parts 21 and 22. A variable resistor that performs click node operation without conducting.