JPH07118406B2 - Variable resistor and its manufacturing method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small variable resistor having a rotating body and a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, in a variable resistor disclosed in, for example, Japanese Utility Model Publication No. 62-25841, an engaging portion is formed on a slider and a stopper is projected on a side edge of a substrate. The locking portion protrudes from the slider in the radial direction, contacts the side surface of the stopper by rotation, and regulates the rotation range.
The chip-type variable resistor disclosed in Japanese Utility Model Laid-Open No. 59-63403 is provided with a stopper that projects upward from the edge (outer portion) of the substrate and bends inward, and the slider is rotated to project into the stopper. One piece abuts and regulates the range of rotation.

[0003]

In the former case of the above-mentioned conventional techniques, since the engaging portion projects in the radial direction of the slider, the engaging portion protrudes from the outer peripheral edge of the variable resistor during rotation. , There is a risk of contact with other electronic components. Further, in order to avoid this, it is necessary to mount the electronic components with a sufficient space between them, which poses a problem in that the packaging density becomes higher and the electronic device becomes smaller.

In the latter case, the manufacturing method is such that a vertical groove is provided at the edge of the substrate, the end portion of the metal terminal integrally provided on the lower end side of the hollow shaft is bent upward along the vertical groove, and the upper end thereof is provided on the substrate. Is to project above and bend inward,
There are drawbacks that the manufacturing method is complicated and the processing is difficult. Moreover, since it is manufactured one by one, manufacturing man-hours and costs are required, and automation is difficult in terms of structure and equipment.

The present invention has been made in view of the above-mentioned problems of the prior art. The locking portion of the slider does not stick out of the outer peripheral edge of the substrate even during rotation, and the size is reduced. It is an object of the present invention to provide a variable resistor which is easy to manufacture and easy to manufacture, and which enables high-density mounting on a circuit board, and a manufacturing method thereof.

[0006]

The present invention has an insulative substrate, a rotating body on which a slider is formed and which is rotatably attached to the substrate, and a base portion which is attached to the lower surface of the substrate. An eyelet shaft projecting from a central portion of the base portion and penetrating an insertion hole of the substrate, and an end portion of the base portion bent in a protruding direction of the eyelet shaft and inserted into a through hole formed in the substrate. The standing piece, the terminal bent from the other end of the base portion in the direction opposite to the projecting direction of the eyelet shaft, and the central portion of this terminal is punched to form a forked shape, and the punched portion is The locked piece bent in the protruding direction of the eyelet shaft, which is the opposite direction to the terminal, and the bent portion bent from the tip end side of the locked piece toward the axis of the eyelet shaft are integrated. And then insert the eyelet shaft into the board. Tip of the serial eyelet shaft Naru caulked a variable resistor.

Further, according to the present invention, an insulative substrate and a rotating body on which a slider is formed are provided, and a large number of frame members made of a metal plate are integrally formed through a connecting portion. In this frame material in a state of being connected by a connecting portion, a base portion attached to the lower surface of the substrate, an eyelet shaft projecting from a central portion of the base portion and penetrating through an insertion hole of the substrate, and one end of the base portion A standing piece bent in the protruding direction of the eyelet shaft and inserted into a through hole formed in the substrate, a terminal bent from the other end of the base portion in a direction opposite to the protruding direction of the eyelet shaft, and the other end thereof. From the locked piece bent obliquely upward to such an extent that the rotating body does not interfere with the insertion direction of the eyelet shaft in the protruding direction of the eyelet shaft,
A bent portion bent from the tip end side of the locked piece toward the axis of the eyelet shaft is integrally formed, and the eyelet shaft is inserted into the insertion hole of the substrate. The eyelet shaft protruding from the insertion hole of the substrate is inserted into the rotating body which has a locking portion always located inside the outer peripheral edge of the substrate, and then the tip end of the eyelet shaft is swaged to be rotatable. Then, the rotating body is held, and thereafter the locked piece bent obliquely upward is bent in the same direction as the protruding direction of the eyelet shaft with respect to the substrate surface, and the locking portion and the This is a method of manufacturing a variable resistor in which a bent portion of a locked piece is formed so as to be engageable with each other when rotating.

[0008]

[Operation] In the variable resistor according to the present invention, the locked piece for restricting the rotation range of the rotating body is integrally formed with the terminal projecting from the base portion, and the terminal is positioned and the locked piece is prevented from being displaced. By using the upright piece, the size of the rotating body should be small and free of rattling. Furthermore, the rotation range of the rotating body should not extend outside the board, and the locking part should not come into contact with external parts during mounting. At the same time, many parts such as the locked portion are continuously and integrally formed by a frame made of a metal plate to facilitate manufacturing.

[0009]

Embodiment An embodiment of the present invention will be described below with reference to the drawings. This embodiment relates to a variable resistor, in which a resistor 2 is formed on the surface of a substrate 1, and a substrate portion of a pair of terminals 3 is fixed by solder 4 to both ends of the resistor 2. Further, the eyelet shaft 5 of the frame member 6 is inserted from the back surface side into an insertion hole (not shown) in the central portion of the substrate 1, and the front end portion of the eyelet shaft 5 is caulked on the front surface side of the substrate 1, so that the rotating body 7 is rotated. Is rotatably attached. A slider 8 is formed on the rotor 7, and the tip of the slider 8 is in contact with the resistor 2. Further, a locking portion 9 standing upright in the axial direction of the eyelet shaft 5 is provided on one end surface of the rotating body 7, and the rotation locus of the outermost peripheral edge of the rotating body 7 is outward from the outer peripheral edge of the substrate 1. The locking portion 9 is formed in a shape that does not protrude.

Further, the frame member 6 is made of a metal plate, and a base portion 14 is formed apart from the terminals 3 and 3 and attached to the lower surface of the substrate 1. The eyelet shaft 5 is projected upward from the center of the base portion 14. ing. Further, one end of the base portion 14 is provided with a standing piece 15 which is bent upward and is inserted into a through hole 16 formed in the substrate 1, and the other end thereof is provided with a standing piece 15.
A terminal 10 extending downwardly of the base 1 and a base 1 as shown in FIG.
4 and the to-be-locked piece 12 which protrudes diagonally upward with respect to FIG. The tip of the locked piece 12 has a bent portion 11 that is bent slightly in the axial direction of the eyelet shaft 5 (the central direction of the substrate 1) slightly above the upper surface of the rotating body 7. Further, as shown in the drawing, the locked piece 12 is formed by punching the central portion of the terminal 10 in a cantilever manner in the longitudinal direction.

In the method of manufacturing the variable resistor of this embodiment, first, the resistor 2 is formed on the substrate 1 and the terminals 3 are soldered. The frame member 6 is formed by press-molding a metal plate such as a steel plate to simultaneously form a large number of frame members 6 on which the base portion 14, the eyelet shaft 5, etc. are formed. As shown in FIGS. The frame members 6 are formed so as to project from the frame 13. At this time, as shown in FIG. 7, the locked piece 12 has a bent portion 11 when the eyelet shaft 5 is inserted into the substrate 1.
So as not to interfere with each other, press-molding is performed such that the locked piece 12 is inclined outward with respect to the mounting position of the substrate 1 and is bent obliquely upward.

A plurality of frame members 6 are connected to the connecting portion 13.
Inserting the eyelet shaft 5 into the insertion hole (not shown) in the central portion of the substrate 1 from the lower surface side while keeping the state attached to, and further rotating the body 7 to the eyelet shaft 5 protruding from the insertion hole of the substrate 1. Insert it, crimp the tip of the eyelet shaft 5, and at the same time raise the standing piece 15
Is inserted into the through hole 16. Then, the locked piece 12 of the frame member 6 is raised at right angles to the surface of the substrate 1 so as to abut the side surface of the substrate 1 so that the bent portion 11 is parallel to the upper surface of the rotating body 7. To do. As a result, the rotating body 7
The locking portion 9 of the abutting contact with the bent portion 11 of the locked piece 12,
The sliding range of the slider 8 is restricted. Moreover, even during the rotation of the locking portion 9, the rotating body 7 can be locked without a part of the locking portion 9 protruding from the outer peripheral edge of the substrate 1.

According to the method of manufacturing the variable resistor of this embodiment, since the frame member 6 is initially formed by inclining the locked piece 12 obliquely, the eyelet shaft 5 of the frame member 6 is formed on the substrate 1. Even when inserting, the bent portion 11 is positioned slightly outside the end edge of the substrate 1 and is not an obstacle. Further, the frame member 6 is attached to the substrate 1 by the eyelet shaft 5 projecting from the base portion 14, and the standing piece 15 at one end of the base portion 14 is inserted into the through hole 16 of the substrate 1,
Since the frame member 6 is positioned, a recess for fitting the locked piece 12 to the edge of the substrate 1 for fixing the locked piece 12 at the other end of the base 14 with the eyelet shaft 5 sandwiched between Need not be provided. Further, the edge of the substrate 1 can be formed into a linear shape, which can be easily miniaturized and efficiently manufactured. Further, the area of the substrate 1 and the surface of the rotating body 7 parallel to the substrate 1 can be reduced,
It also contributes to the improvement of the mounting density on the circuit board.

[0014]

In the variable resistor of the present invention, the standing piece, one terminal and the locked piece are integrally formed with the base portion, so that the variable resistor has a simple structure and high strength, and the terminal and the covered piece are covered. The position accuracy of the locking piece is also high. Further, the attachment strength of the locked piece as the stopper of the rotating body is high, and it can be made stable.

Further, according to the method of manufacturing the variable resistor of the present invention, the frame member integrally provided with the eyelet shaft and the engaged piece is
Since the upright piece that is inserted into the through hole of the board to prevent the frame material from rotating is integrally provided, it is not necessary to provide a recess or the like on the edge of the board to fix the locked piece, and the edge of the board By making the shape simple, the size can be easily reduced and the manufacturing can be facilitated. Furthermore, in the present invention, many members such as eyelet shafts and locked pieces are integrally assembled by using a frame material made of a metal plate.
It can be performed continuously using a frame material, can be kept at low cost, and is suitable for mass production. Also,
In the variable resistor manufactured according to the present invention, the locking portion formed upright from the rotating body and the locked piece having the bent portion bent to the central portion of the substrate come into contact with each other to rotate the rotating body. Since the range is regulated, the locking portion can be made small so that it does not protrude from the outer peripheral edge of the substrate, and it does not come into contact with the adjacent electronic component during rotation of the rotating body. Since the locking portion of the rotating body does not protrude from the substrate, the mounting density can be increased, which can contribute to downsizing of electronic devices and is easy to handle during transportation or when put in a magazine case.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of a variable resistor according to the present invention.

FIG. 2 is a plan view of a variable resistor according to this embodiment.

FIG. 3 is a front view of the variable resistor of this embodiment.

FIG. 4 is a right side view of the variable resistor of this embodiment.

FIG. 5 is a plan view of the frame member of this embodiment.

FIG. 6 is a front view of the frame member of this embodiment.

7 is a cross-sectional view taken along the line AA of FIG.

FIG. 8 is a front view showing a state in which a plurality of frame members of this embodiment are connected to a connecting portion.

[Explanation of reference numerals] 1 substrate 2 resistor 3 terminal 6 frame material 7 rotating body 9 locking part 10 terminal 11 bent part 12 locked piece 14 base 15 standing piece 16 through hole

Claims (2)

[Claims] 1. An insulating substrate, a rotating body rotatably attached to the substrate, and a base portion attached to the lower surface of the substrate. The substrate is inserted from the center portion of the base portion. The eyelet shaft that penetrates the hole, the upright piece that is bent from one end of the base portion in the protruding direction of the eyelet shaft and is inserted into the through hole formed in the substrate, and the eyelet shaft from the other end of the base portion. And a protruding portion of the eyelet shaft in which the center portion of this terminal is punched to form a bifurcated shape and the punched portion is in the opposite direction to the terminal. And the bent portion bent from the tip side of the locked piece toward the axis of the eyelet shaft are integrally molded, and the eyelet shaft is inserted into the substrate. Variable resistance with the tip of the eyelet shaft crimped vessel. And the substrate 2. A insulating, slider provided times <br/> rotary body which is formed, a frame member made of a metal plate via a connecting portion formed numerous integrally Each frame member In this frame material in a state of being connected by the connecting portion, a base portion attached to the lower surface of the substrate, an eyelet shaft projecting from a central portion of the base portion and penetrating through an insertion hole of the substrate, and a base portion of the base portion. A standing piece bent from one end in the protruding direction of the eyelet shaft and inserted into a through hole formed in the substrate, a terminal bent from the other end of the base portion in a direction opposite to the protruding direction of the eyelet shaft, and From the other end, with respect to the protruding direction of the eyelet shaft, a locked piece that is bent obliquely upward so as not to interfere when the rotating body is inserted into the eyelet shaft, and the eyelet from the tip side of the locked piece. Molded together with the bent part that is bent toward the axis of the shaft , Inserted through the eyelet shaft insertion hole of the substrate, to the rotary member having an engagement portion for rotation locus after this is located inside the outer peripheral edge of always the substrate, interpolation of the substrate
By inserting the eyelet shaft protruding from the through hole of the rotary body
Hold it rotatably , crimp the tip of the eyelet shaft, and then fold the locked piece bent obliquely upward so that it is in the same direction as the protruding direction of the eyelet shaft with respect to the substrate surface. A method of manufacturing a variable resistor, which is formed by bending to form the locking portion and the bent portion of the locked piece such that they can be engaged with each other during rotation.