JPS63164401A - Rotary-operation type variable resistor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a variable resistor with an operating knob used mainly in small consumer audio equipment such as small radios and small tape recorders.

2. Description of the Related Art An example of a conventional general variable resistor with an operating knob is shown in FIGS. FIG. 6 is a side sectional view, and FIG. 6 is an exploded perspective view showing the components.

In the figure, reference numeral 1 denotes a resistor board made of an insulating resin material, on the surface of which a horseshoe-shaped resistor printed layer 2 and its start and end lead-out portions 3.4, and a circular conductor layer 6 and its lead-out portions 6 are arranged.
A small circular hole 7 is provided in the center. Reference numeral 8 denotes an external connection terminal to be attached to the lead-out parts 3, 4.6, and its stud part Sa is inserted into the mounting holes 31L, 4a of each lead-out part of the resistance board 1.
, 61L, conduction is fixed. Reference numeral 9 denotes a sliding contact made of an elastic thin metal plate, which has an elastic contact portion 10.11 that rotates and slides on the resistor printed layer 2 on the resistor substrate 1 and the circular conductor layer 6 while short-circuiting them. The dowel (not shown) of the disc-shaped knob 13 is passed through the hole 12& of the fixing portion 12, and is attached to the lower surface of the knob 73. The knob 13 is made of insulating resin, has a larger outer diameter than the resistor board 1, and has a circular hole 14 in the center.

Reference numeral 16 denotes a fixing fitting made of a metal plate, with a hole 16 drilled in the center, and these knobs 13,
Overlap the resistance board 1 and the fixing metal fittings 16, and insert the stepped studs 17 into the center holes 14, 7, and 16 using the knobs 13.
It is assembled as a variable resistor by passing it through from the side and attaching the tip that comes out on the back side of the fixing metal fitting 16.

At this time, so that the knob 13 can freely rotate around the stepped stud 17, the diameter and thickness of the hole 14 are provided with an allowance, and the protrusion 18 of the fixing metal fitting 15 is provided with an allowance.
A part of a stopper (not shown) is provided near the outer periphery of the stopper for abutting the rotation angle range of the rotation angle.

When installing this type of variable resistor into a set, insert the mounting foot 19 of the fixing bracket 16 and the three external connection terminals 8 into the holes of the printed circuit board 20 and solder them on the back side. It is attached.

By pressing the outer circumference of the knob 13 with a finger and rotating it, the sliding contact 10.11 rotates and slides on the resistor printed layer 2 and the circular conductor layer 3, and the resistance value is taken out between the external connection terminals 8. is subject to change.

Problems to be Solved by the Invention In this type of variable resistor, the elastic contact portion IQ, 11
When the elastic contact part 10.11 is in the individual state, when the dowel of the circular knob 13 is inserted through the hole 12 & of the fixing part 12 of the elastic contact part 10.11, or when the dowel of the circular knob 13 is attached to the circular knob, an external force is applied to the elastic contact part. '10.11 deformation, deflection, etc. occurred, causing problems such as not being able to trace a trajectory on the resistive printed layer 2 and making contact unstable.

The present invention aims to provide a rotationally operated variable resistor that can eliminate all of the above problems.

Means for Solving the Problems The present invention attempts to solve the above problems by providing a contact section of an elastic contact body in the internal gap of the base section and rotating the resistor board together with the knob. It is.

Operation By adopting the above-mentioned means, the present invention can operate in the same manner as the conventional type, and furthermore, by providing a contact portion in the gap, deformation of the gap can be prevented.

Embodiment An embodiment of a small variable resistor with an operating knob according to the present invention is shown in FIGS. 1 to 4.

FIG. 1 is a perspective partial sectional view, and in the figure, 21 is a circular knob made of molded resin, and a circular hole 22 is located in the center of the inside.
It also has a thin annular portion 23 near the outer periphery. Incidentally, FIG. 2 is a plan view of the circular knob 21.

As shown in the plan view in FIG. 3, inside the knob ring part 23, there is a circular resistance board 24 made of an insulating material, with a circular hole 26 in the center thereof corresponding to the circular hole 22 of the circular knob 21, The notch of the resistance board 24 is positioned and mounted by fitting the portion 26 into the protrusion 27 of the circular knob 21 without play.

Then, on the (one side) surface of the resistor board 24, there is a resistor print layer 28 having a circular shape with a partially chipped portion, and a circular conductor print layer 30 that is electrically connected to the ends 291L and 29b of the resistor print cutout portion, respectively. .31 are arranged concentrically with respect to the center hole 26.

Reference numeral 32 denotes a base portion made of insulating resin, and FIG. 4(IL) is a plan view thereof, and FIG. 4(b) is a sectional view of the base portion.

That is, the center of the base portion 32 has a stepped support 33 that supports the circular knob 210 and the circular hole 22, and the large diameter support 3
3b rotatably fits and supports the circular hole 22 of the knob 21, and a spacer 34 made of an elastic material is inserted into the oval-shaped column 331L at the tip protruding upward, and the spacer 34 is inflated by a method such as heat strangulation. Holds 21. Further, the protrusion 32 & of the base portion 32 comes into contact with the protrusion 21 & of the knob 21 and serves as a stopper for regulating the rotation angle range of the knob 21 .

Further, in the gap 44 of the flat plate part of the base part 32, a contact part 35.3 is made of an elastic metal plate and comes into elastic contact with the resistor printed layer 2 and the circular conductor printed layer 30.31 on the surface of the resistor board 24.
Three independent elastic contact bodies having a diameter of 6.37 are provided. The base portions of the elastic legs 38, 39.40 are fixed by insert molding in an insulating resin, and the elastic legs 3B, 39.40 are further extended to the outside to form external connection terminal portions 41, 42.43'i are formed.

The resistor of this embodiment described above operates as a variable resistor in the same manner as the conventional type.

The present variable resistor is constructed as described above, and is assembled by combining the knob 21 with the resistance board 24 attached to the base portion 32 to which the elastic contact bodies 3B and 39.40 are fixed.

Effects of the Invention In the present invention, by providing the contact portion of the elastic contact body in the internal gap of the base body, deformation and deflection of the elastic contact body due to external force can be prevented.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view of a rotary-operable variable resistor according to an embodiment of the present invention, Fig. 2 is a plan view of a knob used in Fig. 1, and Fig. 3 is a resistance board used in Fig. 1. 4(a) is a plan view of the base used in FIG. 1, FIG. 4(b) is a cross-sectional view of the base part used in FIG. 1, and FIG. 6 is a conventional rotary operation type. FIG. 6 is a side sectional view of the variable resistor and an exploded perspective view of a conventional rotary-operable variable resistor. 21...Knob, 22...Knob circular hole, 23...Knob ring part, 24...
Resistance board, 26...Resistance board circular hole, 26...
...Resistance board notch, 27...Knob protrusion, 2B...Resistance printed layer, 29! L. 29, b... End of resistive printing image, 30.31.
... Circular conductor printed layer, 32 ... Base part,
33...Stepped support column, 34...Spacer, 35, 36.37...Elastic contact portion, 38.3
9.40...Elastic contact (1s), 41.42,
43...External connection terminal section, 44...Vacancy. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3

Claims (1)

[Claims] A resistive substrate having on one surface thereof a resistive printed layer arranged in a circular shape and a circular conductive printed layer formed concentrically with the resistive printed layer, and positions corresponding to each of the resistive printed layer and the conductive printed layer. an elastic contact body having a tip contact portion at the top; an operating knob mounted on the surface of the resistor board opposite to the elastic contact body; and a base portion comprising a contact portion of the elastic contact body disposed in the gap thereof. Rotationally operated variable resistor consisting of.