KR100349781B1 - Variable Resistor - Google Patents

Abstract

The present invention provides a variable resistor capable of suppressing the stress acting on the contact portion when the slide touches the stopper portion and ensuring the rotation angle of the slide and the strength of the substrate side stopper portion.

An arm portion of a sliding member supported to rotate freely is brought into contact with a substantially circular arc-shaped resistor provided on a substrate as a supporting point. The slide is punched while connecting the driver plate composed of a flange portion and a substantially dish-shaped protrusion formed at the center portion, and a substantially ring-shaped arm portion composed of a contact portion, and bent 180 degrees at the connecting portion to move the dish-shaped protrusion downward from the female portion. The plate-shaped protrusion is attached to the terminal. The stopper portion is formed at right angles to the terminal along the side of the substrate, and a piece of stopper extending radially between the two connecting portions of the slide is integrally formed with the terminal flange portion. Slip the stopper on the stopper part of the terminal to regulate the angle of rotation of the slide

Description

Variable Resistor {Variable Resistor}

The present invention relates to a thin and compact variable resistor, in particular a stopper structure for regulating the rotational angle of the slider.

Conventionally, as such a variable resistor, as in Japanese Patent Laid-Open No. 11-16710, a variable resistor in which a substantially circular arc-shaped resistor provided on a substrate is brought into contact with a female part of a slide supported to rotate freely with the center of the resistor as a supporting point. Is known. The slide is punched from a single conductive thin plate in a state in which a driver plate composed of a flange portion formed at the outer circumference portion and a substantially dish-shaped protrusion formed at the center portion and a substantially ring-shaped arm portion composed of a contact portion are connected to each other. The plate-shaped protrusion was projected downward from the arm by bending 180 degrees, and the plate-shaped protrusion was attached to the substrate so as to be rotatable. A metal terminal is attached to the bottom surface of the substrate so that a part of the metal terminal extends along the side of the substrate toward the surface, and the extension portion is inclined toward the center of the substrate to form a stopper. Then, the side of the sliding part of the sliding body is brought into contact with the stopper portion of the metal terminal to regulate the rotational angle of the sliding surface.

In the case of the variable resistor, in order to secure the spring length of the arm part, the connection part is also divided into two parts, and this connection part has a structure which contacts the stopper part of a metal terminal. Therefore, when the connection part of the sliding member contacts the stopper part of the metal terminal, stress is applied to the connection part, stress is also spread to the contact part which is connected to the connection part, and the contact pressure fluctuates, resulting in a large contact resistance or poor contact. there was.

In addition, since the two connecting portions are formed at positions separated from each other, the center angles of one connecting portion edge portion and the other connecting portion edge portion in contact with the stopper portion of the metal terminal are large, and the rotation angle of the sliding member is restricted. In order to secure a predetermined rotation angle, it is necessary to reduce the width size of the stopper portion of the metal terminal, causing a problem that the strength of the stopper portion of the terminal decreases.

1 is a broken perspective view of a portion of an example of a variable resistor according to the present invention.

2A to 2D show an example of the variable resistor according to the present invention, FIG. 2A is a plan view, FIG. 2B is a front view, FIG. 2C is an AA cross-sectional view, and FIG. 2D is a bottom view.

3 is a plan view of the variable resistor sliding of FIG. 1 rotated in one direction.

4A and 4B are plan views of another example of the stopper portion of the terminal.

Description of the main parts of the drawing

1: substrate

3: resistor

10: Slider

11a: flange portion

11b: dish-shaped protrusion

11c: stopper piece

12: dark

12a: contact part

13 connection

20: terminal

22: standing piece (stopper part)

Accordingly, an object of the present invention is to provide a variable resistor capable of suppressing the stress when the sliding member touches the stopper portion of the substrate and spreading the sliding angle of the sliding portion and the strength of the stopper portion of the substrate.

In order to achieve the above object, the invention described in claim 1 is a variable resistor in which a substantially circular arc-shaped resistor formed on a substrate is brought into contact with a female part of a slide supported to rotate freely with a central point of the resistor as a supporting point. From a single sheet of conductive thin plate, a driver plate composed of a flange portion formed on the outer periphery and an approximately plate-shaped protrusion formed on the center portion, and punched in a state in which a substantially ring-shaped arm portion composed of a contact portion is connected and punched off at the connecting portion A variable resistor which protrudes a shaped protrusion downward from a female portion and attaches the dish-shaped protrusion to the substrate, wherein a stopper portion is protruded on the substrate, and the connecting portion of the sliding member is formed in a bifurcated shape. Protrude radially between the joints Fur piece is formed integrally with the stopper piece is provided a variable resistor that is in contact with the stopper portion of the substrate, the rotation angle's sliding regulation.

In the present invention, the stopper on the sliding side is not a connecting portion, but a stopper piece projecting radially through the connecting portion from the flange portion, so that the stopper piece is provided at a portion independent from the arm portion having the contact portion. Therefore, when the stopper piece contacts the stopper part of the substrate, the stress does not spread to the contact part even if it spreads to the flange part from the stopper piece. Therefore, it is possible to solve the problem that the contact pressure fluctuates and the contact resistance increases or a contact failure occurs.

Moreover, since the center angle of one edge part and the other edge part of the stopper piece of a sliding member can be made small, the rotation angle of a sliding member can be taken large. Therefore, it is not necessary to make the width size of a board | substrate stopper part small, and the strength of a board | substrate stopper part can be ensured.

When the stopper piece of the sliding member is bent obliquely downward as in claim 2, the stopper piece contacts the lower portion of the substrate stopper part, so that the burden on the substrate stopper part is reduced, which helps to improve the durability of the substrate stopper part.

As in claim 3, the stopper portion protruding from the substrate is a standing piece in which one end of the metal terminal attached along the bottom surface of the substrate is bent upward along the side surface of the substrate. When both sides are bent in the plate thickness direction and the sides of the stopper piece of the sliding element are in contact with both sides, the standing piece cross-sectional coefficient of the terminal increases and the flexural rigidity of the standing piece increases, thereby sliding. When the pieces of the stopper of the ruler touch, the deformation of the standing piece is reduced.

As in claim 4, a small eyelet disposed in the center hole of the substrate is formed in the metal terminal provided with the stopper, and the small hole is fitted into a hole formed in the plate-shaped protrusion of the sliding member to fix the sliding terminal. When it is rotatably attached to, the metal terminal for attaching the slider serves as a stopper portion, so the number of products is minimal and the variable resistor can be miniaturized.

1, 2A-2D show an example of a variable resistor according to the present invention.

This variable resistor is composed of an insulating substrate 1 having a resistor 3, a sliding member 10 and a metal terminal 20. As shown in FIG.

The resistor 3 is coated in a substantially bow shape centering on the hole 2 on the upper surface of the substrate 1, and is formed by firing. External electrodes 4 and 5 formed from both side surfaces of the substrate 1 to the rear surfaces of the resistor 3 are connected.

The sliding member 10 punches the driver plate 11 and the arm part 12 from the one conductive thin plate in the state connected through the two-pronged connection part 13, and the arm part 12 is connected to the driver plate ( 11 is bent 180 degrees in the connecting portion 13 in the downward direction. The driver plate 11 has a flange portion 11a formed at the outer circumference portion and an approximately plate-shaped protrusion portion 11b formed at the center portion, and the flange portion 11a protrudes radially between the connecting portions 13. The stopper piece 11c was formed integrally.

The stopper piece 11c of this embodiment is bent obliquely downward. In addition, the arm portion 12 is formed in a ring shape consisting of a contact portion 12a protruding downward, and a bow-shaped slit 12b is formed so as to divide the contact portion 12a, thereby forming the resistor 3. Multi-point contact with little electrical resistance change is secured.

By bending the arm 12 at the connecting portion 13 by 180 degrees, the dish-shaped protrusion 11b is inserted between the arm portions 12. Four protruding pieces 11d are formed in the side part of the plate-shaped protrusion part 11b at 90 degree intervals, and the contact part 12a of the arm part 12 and the lower surface of the two opposing pieces 11d opposing are formed. The intermediate part with the connection part 13 is contact-supported. Moreover, the other two opposing pieces 11d facing each other have no function of supporting the arm portion 12. The four protruding pieces 11d are formed by cutting the plate-shaped protrusions 11b and then punching the plate-like protrusions 11b downwardly over the plate-shaped protrusions 11b. These protrusion pieces 11d constitute the bottom part of the cross-shaped driver groove 11e.

The sliding member 10 having the above-described configuration has a hole 11f formed in the central portion of the plate-shaped protrusion 11b through the small hole 21 of the metal terminal 20 which is inserted through the hole 2 of the substrate 1. ) Is rotatably attached to the substrate 1. The terminal 20 is arrange | positioned at the bottom surface of the board | substrate 1, and the standing piece (stopper part 22) bent upward along the side surface of the board | substrate 1 is formed in one end of the terminal 20. As shown in FIG. Both side portions 22a of the standing piece 22 are bent in the plate thickness direction toward the center direction of the substrate 1, and the both side portions 22a of the stopper piece 11c of the sliding member 10 are positioned. The side part contacts and the rotation angle of the slide 10 is regulated. By bending both side portions 22a of the standing piece 22 in the sheet thickness direction as described above, the rigidity of the standing piece 22 is increased, and the stopper piece 11c described later is a standing piece ( Deformation of the standing piece 22 can be suppressed when it comes in contact with the recess 22.

Moreover, the shape of the stopper part of the terminal 20 is not only the shape which bent both side parts 22a like the said standing piece 22, but also a standing piece 22 like FIG. 4A, for example. The cross section may be formed in a cross-sectional bow shape, or may be formed in a cross section V shape as shown in FIG. 4B.

The arm part 12 protrudes downward from the dish-shaped protrusion part 11b in a natural state, and when the slide 10 is attached to the board | substrate 1, the contact part 12a is the elastic force of the arm part 12 only. Not by the pushing force of the protrusion pieces 11d, but in strong contact with the resistor 3. Therefore, the contact pressure between the contact portion 12a and the resistor 3 can be increased, and the electrical contact resistance and perturbation noise can be reduced. In addition, since the contact pressure between the contact portion 12a and the resistor 3 is large, the flux that is accidentally attached to the resistor 3 when soldered can be scraped off from the contact portion 12a.

In order to change the resistance value of the variable resistor, for example, the positive driver can be adjusted by engaging the driver groove 11e and turning the slider 10. When the slide 10 is rotated to the end, as shown in FIG. 3, one edge portion of the stopper piece 11c touches one side portion 22a of the standing piece 22 of the terminal 20. At this time, the contact portion 12a of the slide 10 comes into contact with one end of the resistor 3. When the stopper piece 11c comes in contact with the side portion 22a of the standing piece 22, the stopper piece 11c generates a stress, and the stopper piece 11c is a driver plate (11) of the sliding member 10. Since it extends from 11), the stress of the stopper piece 11c does not spread directly to the contact portion 12a. Therefore, problems such as a change in contact pressure and a large contact resistance can be solved. In addition, when the stopper piece 11c comes in contact with the standing piece 22, a stress is also generated in the standing piece 22, and the stopper piece 11c is bent obliquely downward to stop the piece. (11c) is in contact with the end of the standing piece (22). In other words, as shown in Fig. 2C, the distance from the end of the standing piece 22 to the contact point with the stopper piece 11c can be shortened and the bending moment becomes smaller, so that the standing The load on the piece 22a can be reduced. In addition, the standing pieces 22 have a high flexural rigidity because the cross-sectional coefficient is increased by the bent portions 22a on both sides, and deformation of the standing pieces 22 can be prevented.

As shown in FIG. 3, since the center angle α of both edges of the stopper piece 11c of the slide 10 can be made smaller than the edge center angle β of the connecting portion 13, the rotation angle of the slide 10 is adjusted. Can catch big. Therefore, the width D of the standing piece (stopper portion 22) of the terminal 20 can be set to a dimension necessary for strength, and the strength of the stopper portion 22 can be sufficiently secured.

The present invention is not limited to the above embodiment.

In the above embodiment, the standing piece of the terminal is used as the stopper portion on the substrate side, but the stopper projection can be integrally provided from the substrate, and the stopper piece of the sliding member can be brought into contact with the projection.

In addition, in the above embodiment, the external electrodes 4 and 5 were formed in order to connect both ends of the resistor 3 to the outside. Instead, the terminal for external connection was fixed to the substrate 1 by insert molding or the like. It can also be connected with a resistor.

As can be seen from the above description, according to the present invention, since the stopper piece of the slide is provided in a portion independent from the contact arm portion, the stress when the stopper piece of the slide touches the substrate stopper portion does not spread to the contact portion. In addition, it is possible to solve the inadequate point where the contact pressure fluctuates and the contact resistance increases or the contact failure occurs.

Moreover, since the center angle of the edge part of both sides of the stopper piece of a sliding part can be made small compared with the case where the connection part is made into the stopper part, the rotation angle of a sliding part can be caught large and the width | variety size of the board | substrate stopper part can be ensured enough. That is, the rotation angle of the sliding member and the strength of the substrate stopper portion can be secured.

Claims (4)

A variable resistor in which a substantially arc-shaped resistor formed on a substrate is brought into contact with an arm portion of a sliding member supported to rotate freely with a central portion of the resistor as a support point. The sliding member is punched in a state in which a driver plate composed of a flange portion formed on the outer circumferential portion and an approximately plate-shaped protrusion formed on the center portion and a substantially ring-shaped arm portion composed of a contact portion are connected from one sheet of conductive thin plate. A variable resistor having a plate-shaped protrusion projected downward from a female part by bending at a portion thereof and attached to the substrate, The stopper portion protrudes on the substrate, The sliding part of the sliding part is formed in a two-pronged shape, and the flange part is integrally formed with a stopper piece protruding in a radial direction between the connecting parts, and the stopper piece touches the stopper part of the substrate to regulate the rotation angle of the sliding part. Become, The stopper piece of the sliding member is bent obliquely downward. delete The stopper part protruding to the said board | substrate is a standing piece which folded one end of the metal terminal attached along the bottom part of the board | substrate to the upper direction along the side surface of a board | substrate, A variable resistor, wherein both sides of the piece are bent in the plate thickness direction, and the side portions of the stopper pieces of the sliding member can contact the both sides. 4. The metal terminal according to claim 3, wherein a small eyelet is formed in the center hole of the substrate, a hole is formed in the plate-shaped protrusion of the slide, and the small hole is fitted into the hole to fix the sliding. The ruler is rotatably attached to a metal terminal.