JPH10189315A - Variable resistor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of parts and simplify assembly process by directly holding a rotor with plural temrinals extending from a substrate. SOLUTION: Either one end of a terminal 1a and 1c is, electrically connected to a resistor pattern, etc., e.g. by soldering on a substrate 67 where the resistor pattern is formed. With terminals 1a, 1b, and 1c fix-bonded to the substrate 67, a housing 9a is insert-molded, and with a slider 13 built-in the housing 9a, a rotor 21 is housed while free-rotation is allowed. Then a part of the terminals 1a, 1b, and 1c, which are extending from the substrate 67, are positioned slightly lower than a bottom surface part of the housing 9a to provide an electric terminal, meanwhile the end part vicinity is bend-formed so as to cover a part above the rotor 21, so that the rotor 21 is held while free-rotation is allowed. Thus, a variable resistor whose assembly, including handling, is easy is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a variable resistor, and more particularly to a small variable resistor.

[0002]

2. Description of the Related Art A conventional variable resistor is shown in FIGS.
This will be described with reference to FIG. FIG. 10 is an exploded perspective view showing a state immediately before the rotor 51 housed in the housing 59 is held by the cover member 55, and FIG.
FIG. 5 is a cross-sectional view showing a state where a rotor 51 is held by 5; As described above, in the conventional variable resistor, the rotor 51 is held by the cover member 55 made of metal or the like.

[0003]

However, in the variable resistor having such a structure, the cover member 55 is required to hold the rotor 51, and there is a problem that the number of parts is increased. Further, the slider 63 is connected to the rotor 5.
In order to fix the substrate 1 to the substrate 1, a process such as welding or press-fitting is required, and there is a problem that the process is complicated. In particular, in order to reduce the size, it is necessary to reduce the size of individual parts, and a variable resistor that can be easily assembled including handling has been required.

The present invention has been made in view of the above-mentioned conventional drawbacks,
The purpose of the present invention is to eliminate these drawbacks, and it is an object of the present invention to obtain a variable resistor that does not require a separate cover member 55, reduces the number of components, and simplifies the assembly process. .

[0005]

In order to achieve the above object, the present invention relates to a variable resistor having a rotor rotatably housed in a housing, wherein the rotor is directly held by a plurality of terminals extending from a substrate. By doing so, a variable resistor is formed. In addition, one of a plurality of terminals extending from the substrate
The cover and the cover are integrally formed, and the rotor is held by the cover to form a variable resistor. Further, one of a plurality of terminals extending from the substrate and a cover portion are integrally formed, the rotor is held by the cover portion, and the extension terminal extending from the cover portion is placed on the same side as the other terminals. A variable resistor is formed by bending the resistor. In addition, a variable resistor is provided by providing a slider having a structure that stably holds itself in the rotor by elastic deformation when the contact portion contacts the resistance pattern.

[0006]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a plan view of a variable resistor according to a first embodiment of the present invention, and FIG. 2 is a sectional view taken along line II-II of FIG.

Reference numerals 1a to 1c denote terminals, one end of which is electrically connected to a resistance pattern or the like by a method such as soldering on a substrate 67 on which a resistance pattern (not shown) is formed. The housing 9a is insert-molded in a state where the terminals 1a, 1b, and 1c are fixed to the housing 9a. Some of the terminals 1a, 1b, and 1c are used as electrical terminals by being positioned slightly below the bottom surface of the housing 9a. By bending each, the rotor 2
1 is rotatably held.

Thus, the terminal 1 extending from the substrate 67
Since the rotor 21 is rotatably held by a, 1b, and 1c, the cover member 5 conventionally used is used.
5 (see FIGS. 10 and 11) can be eliminated, the number of parts can be reduced, and the assembling process can be simplified. Note that the O shown in FIG.
It goes without saying that the ring 65 can be used in the same manner as in the related art, if necessary.

FIGS. 3 and 4 are a plan view and a side view showing an assembled state of the variable resistor according to the second and third embodiments of the present invention.

FIG. 3 shows a terminal 1a, 1
In a state where b, 1c, etc. are extended, their ends are fixed to corresponding portions of a substrate (not shown) by a method such as soldering.
Further, a housing 9b is insert-molded so as to cover the substrate and the ends of the terminals 1a, 1b, 1c, and a rotor 21 having a slider (not shown) incorporated in the housing 9b.
Is stored. In the right part of FIG. 3, terminals 1a and 1c are formed, which is a commonly used method. On the other hand, in the second and third embodiments of the present invention, as shown in the left part of FIG.
The cover 5 is formed integrally with the cover b, and the extension terminal 3 is formed between the end of the cover 5 and the lead frame. Unlike the first embodiment of the present invention, the lead frame is cut from the lead frame at the positions indicated by the cut portions A or the cut portions B and C in FIG. 3 and bent as shown in FIG. The rotor 21 is held by the cover 5.

Thus, the plurality of terminals 1a, 1b, 1c
The terminal 1b, which is one of the above, and the cover portion 5 are integrally formed and the rotor 21 is held by the cover portion 5, so that the same effect as in the first embodiment of the present invention can be obtained. At the same time, the rotation of the rotor 21 can be made smoother, and the backlash and the like of the rotor 21 can be reduced. Further, as shown in FIG. 4, the second terminal 3 is cut from the lead frame in a state where the second terminal 3 extends from the end of the cover portion 5 (see the cut portion B in FIG. 3), and the other terminals 1a and 1c are folded. By bending the second terminal 3 on the same side surface as the bent side, a variable resistor that can be adjusted sideways can be easily obtained.

FIGS. 5 to 9 show first to third embodiments of the present invention.
13 that can be incorporated in the variable resistor according to the embodiment
5 is a plan view of the slider, FIGS. 6 and 7 are cross-sectional views as viewed from VI-VI or VII-VII of FIG. 5, and FIG. FIG. 9 is a perspective view showing the assembled state, and FIG. 9 is a cross-sectional view showing the state where the slider is incorporated in the rotor.

Reference numeral 13 denotes a slider made of a thin metal plate having elasticity. The contact portions 15a, 15b, and 15c are formed in a substantially semicircular shape by a method such as pressing, and are held on side surfaces of the slider. The portion 19 is provided with a positioning portion 17 at the rear side. On the back side of the rotor 21, a rotor inner side wall 27,
A support portion 25 and a positioning protrusion 23 are provided, and the slider 13 is incorporated therein. As shown in FIG. 8, the slider 13 is incorporated in a support portion 25 provided on the back side of the rotor 21, and the positioning protrusion 23 and the positioning portion 17 are engaged, so that the mounting position of the slider 13 can be changed. Stipulated.

The rotor 21 incorporating the slider 13 is
A terminal or a cover portion (FIG. 2 or FIG. 4) is incorporated in a housing (not shown) formed by insert molding.
1a, 1b, 1c, and 5), the rotor 21 is held, and the contact portions 15a, 15b, and 15c of the slider 13 are held.
9 is brought into contact with a resistance pattern (not shown) formed on a substrate (see 67 in FIG. 2) and is elastically deformed, so that FIG.
As shown in the figure, the slider 19 is displaced from the position shown by the solid line to the position shown by the broken line, and accordingly, the holding portion 19 provided on the side surface of the slider is provided inside the rotor 21 provided on the back side of the rotor 21. The slider 13 comes into contact with the wall 27 and is stably held.

As described above, the contact portions 15a, 15b, 15
Since the slider 13 having a structure to stably hold itself in the rotor 21 is adopted by elastic deformation when c contacts the resistance pattern, a means for fixing the slider 13 to the rotor 21 is not required. As a result, the process can be simplified, and the mounting accuracy of the slider 13 can be improved.

[0017]

As described in detail above, the present invention can provide the following effects.

(1) Since the rotor is directly held by the plurality of terminals extending from the substrate, the cover member conventionally used can be eliminated, and the number of components can be reduced. At the same time, the assembly process can be simplified.

(2) Since one of the plurality of terminals extending from the substrate and the cover are integrally formed and the cover is configured to hold the rotor, the same effect as (1) can be obtained. At the same time, the rotation of the rotor can be made smoother, and the backlash and the like of the rotor can be reduced.

(3) One of the plurality of terminals extending from the substrate and the cover are integrally formed, the rotor holds the rotor by the cover, and the extension terminal extending from the cover is connected to the other terminals. Since it is configured to bend on the same side, the same effect as (2) can be obtained, and side adjustment can be made.

(4) Since a slider having a structure to stably hold itself in the rotor by elastic deformation when the contact portion comes into contact with the resistance pattern is employed, there is no need for a means for fixing the slider to the rotor. The process can be simplified, and the accuracy of assembling the slider can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view of a variable resistor according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a plan view showing an assembled state of a variable resistor according to second and third embodiments of the present invention.

FIG. 4 is a side view showing an assembled state of the variable resistor according to the second and third embodiments of the present invention.

FIG. 5 is a plan view of a slider according to the present invention employed in the variable resistors according to the first to third embodiments of the present invention.

FIG. 6 is a sectional view taken along line VI-VI in FIG. 5;

FIG. 7 is a sectional view taken along line VII-VII in FIG. 5;

FIG. 8 is a perspective view showing a state where the slider of the present invention is assembled.

FIG. 9 is a cross-sectional view showing a state where the slider of the present invention is assembled.

FIG. 10 is a perspective view of a conventional variable resistor.

FIG. 11 is a sectional view of a conventional variable resistor.

[Description of Signs] 1a, 1b, 1c, 1d, 1e, 1f: terminal, 3: extension terminal, 5: cover portion, 7: locking piece, 9a, 9b: housing, 11a, 11b, 11c, 11d: engagement Stop, 13:
Slider, 15a, 15b, 15
c: contact part, 17: positioning part, 1
9: holding part, 21: rotor, 2
3: Positioning protrusion, 25: Bearing,
27: rotor inner side wall, 29: driver groove,
51: rotor, 53: driver groove,
55: Cover member, 57: Locking piece,
59: housing, 61: locking part,
63: slider, 65: O-ring,
67: substrate, 69a, 69b, 69
c: terminal.

Claims (4)

[Claims] 1. A variable resistor comprising a rotor rotatably housed in a housing, wherein the rotor is directly held by a plurality of terminals extending from a substrate. 2. A variable resistor having a rotor rotatably housed in a housing, wherein one of a plurality of terminals extending from a substrate and a cover are integrally formed, and the rotor is held by the cover. A variable resistor characterized by the following. 3. A variable resistor having a rotor rotatably housed in a housing, wherein one of a plurality of terminals extending from a substrate and a cover are integrally formed, and the rotor is held by the cover. A variable resistor characterized in that the extension terminal extending from the cover portion is bent and formed on the same side as the other terminal, thereby enabling side adjustment. 4. The variable according to claim 1, wherein the rotor is provided with a slider having a structure to stably hold itself by elastic deformation when the contact portion comes into contact with the resistance pattern. Resistor.