JP3587731B2 - Chip type variable resistor - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a chip-type variable resistor used for audio equipment and the like.
[0002]
[Prior art]
A conventional chip-type variable resistor will be described with reference to FIG. 7. A rectangular insulating substrate 21 made of ceramic is provided with a shaft hole 21a provided at the center and a shaft hole 21a provided on the surface thereof, and a bottom portion. It has a concave portion 21d having a portion 21b and a side portion 21c, and a stopper portion 21e provided to protrude into the concave portion 21d.
The resistor 22 is provided in a horseshoe shape on the surface of the insulating substrate 21, and terminal portions 23 made of silver or the like are provided at both ends of the resistor 22.
[0003]
The slider 24 made of a metal plate includes a flat base 24a, a dish-shaped protrusion 24b protruding downward from the base 24a, and a circular bottom wall 24c provided on the protrusion 24b. It has a hole 24d provided in the center of the bottom wall 24c.
The stopper member 25 formed integrally with the slider 24 has a circular hole 25a provided at the center and a pair of tongue pieces 25b projecting radially from the outer periphery. The stopper 25 is disposed on the lower surface of the bottom wall 24c with the hole 25a aligned with the hole 24d of the slider 24 in a state where the stopper 25 is formed integrally with the slider 24 by the connecting portion 25c. When 25 is arranged, the tongue piece 25b is in a state of protruding in the radial direction from the outer periphery of the bottom wall 24c.
[0004]
Then, the stopper member 25 and the slider 24 are received in the concave portion 21d of the insulating substrate 21, and the stopper member 25 is placed on the bottom 21b.
The intermediate terminal 26 formed of a metal plate has a base 26a and a shaft 26b formed of eyelets formed by drawing on the base 26a.
The intermediate terminal 26 has a shaft portion 26b inserted into the shaft hole 21a of the insulating substrate 21 from the lower surface, and the shaft portion 26b is inserted into the hole 25a of the stopper member 25 and the hole 24d of the slider 24, and The tip of the portion 26b is attached by caulking.
[0005]
In such a conventional chip-type variable resistor, when the slider 24 is rotated by a driver or the like, the slider 24 slides on the resistor 22 to change the resistance value, and the resistance of the slider 24 is changed. The tongue piece 25b of the stopper member 25 that rotates with the rotation comes into contact with the stopper portion 21e, and the rotation of the slider 24 stops.
[0006]
[Problems to be solved by the invention]
In the conventional chip-type variable resistor, since the tongue piece 25b of the stopper portion 25 projects radially from the outer periphery of the bottom wall 24c of the slider 24, the diameter of the concave portion 21d of the insulating substrate 21 that receives the stopper portion 25 is reduced. Therefore, there is a problem that the insulating substrate 21 becomes large in the lateral direction and is not suitable for miniaturization.
[0007]
[Means for Solving the Problems]
As a first means for solving the above-mentioned problems, an insulating substrate and a slider rotatably mounted on the insulating substrate are provided, and the slider protrudes in a dish shape and has a bottom wall. A protrusion provided on the bottom wall and protruding to the lower surface side in the rotation axis direction of the slider; the insulating substrate having a recess for receiving the tongue; A stopper portion, wherein the tongue piece is arranged in the recess, and the tongue piece is brought into contact with the stopper portion to constitute a stopper.
[0008]
As a second solution, the insulating substrate is provided with a shaft hole for a shaft located at the rotation center of the slider and penetrating the insulating substrate, and holding the shaft on the bottom wall. Then, the stopper is configured within a radial range between the shaft hole and the outer periphery of the bottom wall.
Further, as a third solution, a hole for inserting the shaft portion is provided in the bottom wall of the slider, and the tongue piece provided in the bottom wall is provided adjacent to the hole. The configuration was adopted.
As a fourth solution, the concave portion provided in the insulating substrate has a bottom portion and a side portion, and a tapered portion whose diameter gradually increases from the bottom portion toward the end of the side portion. It has the said side part.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
The chip-type variable resistor according to the present invention will be described with reference to FIGS. 1 to 6. FIGS. 1 to 6 all relate to the chip-type variable resistor according to the present invention. FIG. 1 is a front view, and FIG. 3, FIG. 3 is a cross-sectional view taken along line 3-3 of FIG. 1, FIG. 4 is an enlarged view of a portion 4 of FIG. 3, FIG. 5 is an exploded perspective view of the main part, and FIG. It is a perspective view of.
[0010]
Next, a chip-type variable resistor according to the present invention will be described with reference to FIGS. 1 to 6. A recess 1d having a bottom 1b and a side 1c, and a stopper 1e formed to extend to the shaft hole 1a across the recess 1d.
The side portion 1c of the concave portion 1d is formed with a tapered portion whose diameter gradually increases from the bottom portion 1b toward the end of the side portion 1c (the end on the front surface side).
A pair of terminals 2 made of a metal plate are attached to the insulating substrate 1, and the terminals 2 are connected to both ends of a resistor (not shown) provided in a horseshoe shape on the surface of the insulating substrate 1. (Not shown) by soldering or the like.
[0011]
The slider 3 made of a metal plate includes a flat base 3a, a dish-shaped protrusion 3b protruding from the base 3a toward the lower surface of the center, and a circular bottom wall 3c provided on the protrusion 3b. A hole 3d provided in the center of the bottom wall 3c; a tongue 3e adjacent to the hole 3d and protruding to the lower surface side in the rotation axis direction of the slider 3; And a sliding portion 3f formed by folding back.
The corner of the tongue piece 3e is formed with a non-rounded edge. Therefore, one side forming the corner and one side adjacent to the tongue 3e are formed by press working in another process.
The slider 3 is in a state where the bottom wall 3c is placed on the surface of the insulating substrate 1 and the tongue piece 3e is received in the recess 1d.
[0012]
When the slider 3 is placed on the insulating substrate 1 and the tongue 3e is positioned in the recess 1d, the tongue 3e is guided by the tapered portion provided on the side 1c, and the surface of the insulating substrate 1 is guided. Side to perform accurate positioning of the slider 3 with respect to the insulating substrate 1.
When the slider 3 is placed on the insulating substrate 1, the hole 3d of the slider 3 and the shaft hole 1a of the insulating substrate 1 coincide with each other, and constitute a stopper for rotation of the slider 3. The tongue piece 3e and the stopper 1e are formed in a radial range between the shaft hole 1e and the outer periphery of the bottom wall 3c.
[0013]
The intermediate terminal 4 made of a metal plate has a base 4a and a shaft 4b made of eyelets formed by drawing on the base 4a.
In the intermediate terminal 4, the shaft 4b is inserted into the shaft hole 1a of the insulating substrate 1 from the lower surface, and the shaft 4b is inserted into the hole 3d of the slider 3, so that the tip of the shaft 4a is swaged. And is attached.
An adhesive 5 is provided on the lower surface of the insulating substrate 1, and the hole of the shaft portion 4 b is closed by the adhesive 5. The terminals 2 are bonded to the insulating substrate 1 to prevent the terminals 2 from falling off the insulating substrate 1 while ensuring the suction of the container.
[0014]
In such a chip type variable resistor of the present invention, when the slider 3 is rotated by a driver or the like, the slider 3 slides on the resistor to change the resistance value, and The tongue piece 3e comes into contact with the stopper portion 1e, and the rotation of the slider 3 is stopped.
In this embodiment, a concave portion 1d is provided continuously with the shaft hole 1a, a tongue piece 3e is provided around the hole 3d of the bottom wall 3c, and the inside of the tongue piece 3e serves as a rotary shaft. Since it is in contact with the outer periphery of the shaft portion 4d, there is no need to provide a relief or the like, and the size can be reduced in the radial direction. However, the tongue piece 3e is provided on the outer periphery of the bottom wall 3c, The recess 3d may be provided on the outside of the wall 3c.
Further, in this embodiment, the shaft portion 4d is formed integrally with the base portion 4a, is held rotatably on the surface of the resistor (not shown) of the insulating substrate 1, and has an adhesive on the opposite surface. Although the adhesive 5 is provided, if the adhesive 5 is not required, the shaft 4d and the bottom wall 3c may be integrated, and this may be caulked to the base 4a.
[0015]
【The invention's effect】
In the chip type variable resistor according to the present invention, the slider 3 is provided on the bottom wall 3c and the projection 3b projecting in a dish shape and having a bottom wall 3c. The insulating substrate 1 has a tongue piece 3e that protrudes, the insulating substrate 1 has a recess 1d for receiving the tongue piece 3e, and a stopper 1e located in the recess 1d, and arranges the tongue piece 3e in the recess 1d. Since the stopper is constituted by bringing the tongue piece 3e into contact with the stopper portion 1e, the tongue piece 3e does not protrude in the radial direction, and therefore, it is possible to provide a chip-type variable resistor that is smaller in the lateral direction than the conventional case.
[0016]
Further, the insulating substrate 1 is provided with a shaft hole 1a for a shaft portion which is located at the rotation center of the slider 3 and penetrates the insulating substrate 1, and holds the shaft portion 4b on the bottom wall 3c. Since the stopper is formed within the radial direction between the outer periphery of the bottom wall 3c and the stopper portion 1e and the tongue piece 3e do not project from the outer periphery of the bottom wall 3c, a small chip type variable resistor is provided. it can.
[0017]
Further, the bottom wall 3c of the slider 3 is provided with a hole 3d through which the shaft portion 4d is inserted, and the tongue piece 3e provided in the bottom wall 3c is provided adjacent to the hole 3d. A variable resistor can be provided.
The concave portion 1d provided in the insulating substrate 1 has a bottom portion 1b and a side portion 1c, and has a side portion 1c having a tapered portion whose diameter gradually increases from the bottom portion 1b toward the end of the side portion 1c. With this configuration, the side portion 1c serves as a guide for the tongue piece 3e, and the positioning of the slider 3 with respect to the insulating substrate 1 can be ensured. .
[Brief description of the drawings]
FIG. 1 is a front view of a chip type variable resistor according to the present invention.
FIG. 2 is a back view of the chip type variable resistor according to the present invention.
FIG. 3 is a sectional view taken along line 3-3 in FIG. 1;
FIG. 4 is an enlarged view of four parts in FIG. 3;
FIG. 5 is an exploded perspective view of a main part of the chip-type variable resistor according to the present invention.
FIG. 6 is a perspective view of a main part of the chip-type variable resistor according to the present invention, as viewed from below the slider.
FIG. 7 is an exploded perspective view of a conventional chip-type variable resistor.
[Explanation of symbols]
Reference Signs List 1 Insulating substrate 1a Shaft hole 1b Bottom 1c Side 1d Recess 1e Stopper 2 Terminal 3 Slider 3a Base 3b Projection 3c Bottom wall 3d Hole 3e Tongue 3f Sliding part 4 Intermediate terminal 4a Base 4b Shaft 5 Adhesive

Claims (4)

An insulating substrate, and a slider rotatably attached to the insulating substrate, wherein the slider protrudes in a dish shape and has a projection having a bottom wall; A tongue protruding to the lower surface side in the rotation axis direction of the child; the insulating substrate has a concave portion for receiving the tongue; and a stopper portion located in the concave; A chip-type variable resistor, wherein the stopper is formed by contacting the tongue piece with the stopper portion. The insulating substrate is provided with a shaft hole for a shaft portion that is located at the rotation center of the slider and penetrates the insulating substrate, holds the shaft portion on the bottom wall, and includes the shaft hole and the bottom wall. 2. The chip-type variable resistor according to claim 1, wherein the stopper is formed within a radial range between the outer periphery of the chip and the outer periphery of the chip. 3. The bottom wall of the slider has a hole through which the shaft portion is inserted, and the tongue provided on the bottom wall is provided adjacent to the hole. Chip type variable resistor. The concave portion provided in the insulating substrate has a bottom portion and a side portion, and is configured by the side portion having a taper portion whose diameter gradually increases from the bottom portion toward an end of the side portion. 4. A chip type variable resistor according to claim 1, wherein the variable resistor is a chip type resistor.

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