JP2001052910A - Variable resistor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a mounting characteristics on an opposite-side substrate by embedding a part of the terminal part of an intermediate terminal as well as one end part on the lower side of a pair of external terminal in a terminal fitting plate, and bending the other end at the side edge of the substrate for electrical connection to a pair of terminal. SOLUTION: A terminal fitting plate 29 is so provided as its upper surface contacts the lower surface of a substrate 21, and a part of a terminal part 32 of an intermediate terminal 30 as well as one end on the lower side of a pair of external terminal 33 are embedded in the terminal fitting plate 29. The other end of the pair of external terminal 33 is bent at the side edge of the substrate 21 for electrical connection to a pair of electrodes 24. The shape of the lower surface of the substrate 21 is almost identical with the upper surface of the terminal fitting plate 29, so that when the terminal fitting plate 29 is fitted to the substrate 21, the entire shape in which the substrate 21 and the terminal fitting plate 29 are put together is almost rectangular parallelopiped. A pair of recessed parts 21a is provided on one side surface of the substrate 21, with the pair of recessed parts 21a provided with a pair of external terminals 33.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable resistor used for various electronic devices.

[0002]

2. Description of the Related Art A conventional variable resistor of this type is disclosed in Japanese Patent Application Laid-Open No. 3-270103.

Hereinafter, a conventional variable resistor will be described with reference to the drawings.

FIG. 9 is a side sectional view of a conventional variable resistor, and FIG.
0 is a top view of the variable resistor, and FIG. 11 is a bottom view of the variable resistor.

9 to 11, reference numeral 1 denotes a substrate having a substantially rectangular parallelepiped shape and made of an insulating resin such as ceramic. The substrate 1 has a hollow hole 2 substantially at the center and a horseshoe shape on the upper surface. And a pair of electrodes 4 electrically connected to the resistor 3 at both ends of the resistor 3. 5 is a metal driver plate,
The driver plate 5 is rotatably supported on the upper surface of the substrate 1 and has a slider 6 on the side surface. The slider 6 slides on the resistor 3 of the substrate 1. is there. The driver plate 5 has a driver groove 7 on the upper surface and a through hole 8 at substantially the center. Reference numeral 9 denotes a metal middle terminal. The middle terminal 9 is provided with a cylindrical portion 10 at one end. The cylindrical portion 10 is inserted into the hollow hole 2 of the substrate 1 and the through hole 8 of the driver plate 5, The driver plate 5 is rotatably pivoted. The middle terminal 9 has a terminal portion 11 at the other end.
The terminal portion 11 is provided from the bottom surface of the substrate 1 to one side surface. Reference numeral 12 denotes a pair of metal external terminals. The pair of external terminals 12 are fixed to the substrate 1 so as to sandwich the substrate 1, and one end is provided with a terminal portion 11 of the middle terminal 9 in the substrate 1. The other end is electrically connected to the pair of electrodes 4 on the upper surface of the substrate 1.

The operation of the conventional variable resistor configured as described above will now be described.

A constant voltage is applied to one of the pair of outer terminals 12, the other is grounded, and the terminal portion 11 of the middle terminal 9 is connected.
Is connected to an external circuit (not shown). Then, by inserting a mating driver (not shown) into the driver groove 7 of the driver plate 5 and rotating the same, the potential of the middle terminal 9 is set to an arbitrary resistance value.

[0008]

However, in the above-mentioned conventional configuration, when the size of the variable resistor is reduced, the width of the pair of external terminals 12 is also reduced. When the external force is applied to the external terminal 12 of the variable resistor,
Since the external terminal 12 is moved by the external force, there is a problem that it is difficult to mount the variable resistor on the mating substrate.

The present invention solves the above-mentioned conventional problem. Even if an external force is applied to the external terminal, the external terminal does not move, thereby improving the mountability on the mating substrate. It is intended to provide a resistor.

[0010]

In order to achieve the above object, a variable resistor according to the present invention has a horseshoe-shaped resistor having a hollow hole substantially at the center and an upper surface and electrically connected to both ends of the resistor. A substrate provided with a pair of electrodes to be provided, a driver plate rotatably supported on the upper surface of the substrate, and having a slider sliding on the resistor and having a through hole substantially in the center, and the substrate A middle terminal having a hollow portion and a cylindrical portion inserted through the through hole of the driver plate to pivotally mount the driver plate, and a terminal portion provided from the lower side to one side surface of the substrate; and a pair of electrodes on the substrate. A pair of external terminals electrically connected on the upper surface and provided from the side opposite to the side on which the terminal portion of the middle terminal is provided on the substrate to the lower surface, and the upper terminal is provided on the lower surface of the substrate. A terminal mounting plate is provided so as to abut, a part of a terminal portion of the middle terminal and a lower end of a pair of external terminals are embedded in the terminal mounting plate, and the other end of the pair of external terminals is By bending at the side edge of the substrate and electrically connecting to the pair of electrodes, according to this configuration, even if an external force is applied to the external terminal,
The external terminal does not move, thereby providing a variable resistor capable of improving the mountability on the mating substrate.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a horseshoe-shaped resistor having a hollow hole in the center and a pair of electrodes electrically connected to both ends of the resistor. A driver plate having a slider rotatably supported on the upper surface of the substrate and sliding on the resistor and having a through hole substantially at the center, and a hollow hole in the substrate and a driver. A middle terminal having a cylindrical portion that is inserted into a through hole of the plate and pivotally connects the driver plate, and a terminal portion that is provided from the lower side to one side surface of the substrate; And a pair of external terminals provided from the side opposite to the side on which the terminal portion of the middle terminal is provided on the substrate and from the side surface to the lower surface, such that the upper surface abuts on the lower surface of the substrate. An attachment plate is provided, a part of the terminal portion of the middle terminal and a lower end of the pair of external terminals are embedded in the terminal mounting plate, and the other end of the pair of external terminals is a side edge of the substrate. According to this configuration, a part of the terminal portion of the middle terminal and the lower end of the pair of external terminals are embedded in the terminal mounting plate. And, since the other end of the pair of external terminals is bent at the side edge of the substrate so as to be electrically connected to the pair of electrodes, even if an external force is applied to the external terminals, the external terminals may not move. However, this has the effect that the variable resistor can be accurately mounted on the mating substrate.

According to a second aspect of the present invention, the lower surface of the substrate according to the first aspect and the upper surface of the terminal mounting plate have substantially the same shape, and when the terminal mounting plate is mounted on the substrate, the substrate and the terminal mounting plate are provided. According to this configuration, the lower surface of the substrate and the upper surface of the terminal mounting plate have substantially the same shape, and the terminal mounting plate is mounted on the substrate. When the variable resistor is gripped by the chucking device, the board and the terminal mounting plate are connected to each other because the entire shape of the board and the terminal mounting plate together is substantially rectangular parallelepiped. Can be grasped together, and as a result, the variable resistor can be easily mounted on the mating substrate.

According to a third aspect of the present invention, a pair of recesses are provided on one side surface of the substrate according to the first or second aspect, and a pair of external terminals are provided in the pair of recesses. According to this, a pair of recesses are provided on one side surface of the substrate, and a pair of external terminals are provided in the pair of recesses. Therefore, when bending the other end of the pair of external terminals at the side edge of the substrate, Of the pair of electrodes on the substrate and the other end of the pair of external terminals can be reliably electrically connected to each other. It has.

According to a fourth aspect of the present invention, a conductive material is provided at a connection portion between the other end of the pair of external terminals and the pair of electrodes on the substrate. According to this configuration, since the conductive material is provided at the connection between the other end of the pair of external terminals and the pair of electrodes on the substrate, the other end of the pair of external terminals and the pair of electrodes on the substrate are The electrically conductive material ensures reliable electrical connection, which has the effect of improving the reliability of the variable resistor.

According to a fifth aspect of the present invention, the surface of the cylindrical portion of the middle terminal according to any one of the first to fourth aspects is made of a material to which solder does not adhere, and the surface of the terminal portion has solder attached thereto. It is made of material. According to this structure,
Since the surface of the cylindrical portion of the middle terminal is made of a material to which solder does not adhere, and the surface of the terminal portion is made of a material to which solder adheres, the terminal portion of the middle terminal of the variable resistor is attached to the mating substrate. When electrically connecting with solder,
Solder does not accidentally adhere to the cylindrical portion of the middle terminal, and as a result, the solder does not intervene at the pivotal connection between the cylindrical portion of the middle terminal and the driver plate. Has the effect of stabilizing the operation of rotating.

According to a sixth aspect of the present invention, a pair of convex portions are provided on one side surface of the substrate according to any one of the first to fifth aspects, and a terminal portion of the middle terminal is arranged between the pair of convex portions. The terminal portion and the distal end surfaces of the pair of convex portions are configured to be substantially flush with each other. According to this configuration, a pair of convex portions are provided on one side surface of the substrate, and the pair of convex portions are provided. Since the terminal portion of the middle terminal is disposed between the convex portions of the variable resistor, and the terminal portions and the end surfaces of the pair of convex portions are configured to be substantially flush with each other, the variable resistor is chucked. When grasping by the device,
The variable resistor is no longer tilted and grasped, and as a result, the variable resistor can be securely mounted on the mating substrate.

Hereinafter, a variable resistor according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is an exploded perspective view of a variable resistor according to an embodiment of the present invention, FIG. 2 is a side sectional view of the variable resistor,
3 is a top view of the variable resistor, FIG. 4 is a side view of the variable resistor, and FIG. 5 is a bottom view of the variable resistor.

In FIG. 1 to FIG. 5, reference numeral 21 denotes a substrate made of an insulating resin such as ceramic. The substrate 21 has a hollow hole 22 substantially in the center and a horseshoe-shaped carbon-containing resistor on the upper surface. 23 are provided. Further, a pair of electrodes 24 made of Ag is provided at both ends of the resistor 23 on the substrate 21, and the pair of electrodes 24 are electrically connected to the resistor 23. Further, a pair of concave portions 21a are provided on one side surface of the substrate 21, and a pair of convex portions 21b are provided on a side surface of the substrate 21 facing the one side surface. Reference numeral 25 denotes a metal driver plate. The driver plate 25 is rotatably supported on the upper surface of the substrate 21 and has a slider 26 provided thereon.
Are slidably contacted on the resistor 23. The driver groove 25 is formed on the upper surface of the driver plate 25.
7, and a through hole 28 is provided substantially at the center of the lower surface. Reference numeral 29 denotes a terminal mounting plate made of resin. The upper surface of the terminal mounting plate 29 contacts the lower surface of the substrate 21.
By making the upper surface of the terminal mounting plate 29 substantially the same shape as the lower surface of the substrate 21, the terminal mounting plate 29
Is fixed, the overall shape of the terminal mounting plate 29 combined with the substrate 21 is substantially rectangular parallelepiped. In addition, the solder is not adhered to the terminal mounting plate 29.
Terminal part 3 of middle terminal 30 made of metal such as US301
2 is integrally buried, and a cylindrical portion 31 is integrally provided at one end of the middle terminal 30. The cylindrical portion 31 is formed in the hollow hole 22 in the substrate 21 and the through hole 28 in the driver plate 25. The driver plate 25 is rotatably connected to the upper surface of the substrate 21 by caulking the distal end of the cylindrical portion 31. Further, at the other end of the middle terminal 29, a terminal portion 32 provided with a plating layer (not shown) made of solder on the surface of a metal such as SUS301 is provided. It is provided so as to be located between the pair of protrusions 21b over one side surface from the lower side, and the tip surfaces of the pair of protrusions 21b and the terminal portion 32 of the middle terminal 30 are substantially flush with each other. Further, the lower end of the pair of outer terminals 33 is embedded in the terminal mounting plate 29, and the other end of the pair of outer terminals 33 is connected to the middle terminal 30.
Of the substrate 21 on the side opposite to the side on which the terminal portions 32 are provided
And a pair of electrodes 24 on the substrate 21 and the other end of the pair of external terminals 33 are electrically connected via a conductive material 24a made of solder. . In this case, the conductive material 24 made of solder is connected to the connection between the other end of the pair of external terminals 33 and the pair of electrodes 24 on the substrate 21.
a, the other end of the pair of external terminals 33 and the pair of electrodes 24 on the substrate 21
4a ensures reliable electrical connection, which has the effect of improving the reliability of the variable resistor.

Next, a method of assembling the variable resistor configured as described above according to an embodiment of the present invention will be described.

First, after dividing the multi-piece substrate 21 into individual substrates 21, a pair of concave portions 21a is formed on one side surface of the substrate 21, and the pair of concave portions 21a is provided. A pair of convex portions 21b are formed on the side surface opposite to the side surface.

Next, a substrate 21 on which a horseshoe-shaped resistor 23 has been printed on the upper surface and a pair of electrodes 24 at both ends of the resistor 23 is inserted into a baking furnace (not shown) and passed therethrough. The resistor 23 and the pair of electrodes 24 are
Bake.

Next, after the middle terminal 30 and the pair of outer terminals 33 as shown in FIG. 6 are mounted on a molding die (not shown), the resin melted at a high temperature is poured into a molding die (not shown). ).

Next, a molding die (not shown) is cooled, and a part of the terminal part 32 of the middle terminal 30 and a lower end of the pair of outer terminals 33 are integrally embedded therein.
9 is formed.

Next, the upper surface of the terminal mounting plate 29 and the lower surface of the substrate 21 come into contact with each other, and the terminal mounting plate 29 is inserted so that the cylindrical portion 31 of the middle terminal 30 is inserted into the hollow hole 22 of the substrate 21. After the substrate 21 is placed on the upper surface of the substrate 29, the pair of external terminals 33 are connected to the pair of recesses 2 in the substrate 21.
1a, the other end of the pair of outer terminals 33 is bent at the side edge of the substrate 21.

In this case, a pair of concave portions 21a are provided on one side surface of the substrate 21, and a pair of external terminals 3 are provided in the pair of concave portions 21a.
3, when the other end of the pair of external terminals 33 is bent at the side edge of the substrate 21, the pair of external terminals 3
3 does not protrude from the inside of the pair of concave portions 21a to the outside, and as a result, the pair of electrodes 24 on the substrate 21 and the other end of the pair of external terminals 33 can be reliably electrically connected. Therefore, there is an effect that the reliability of the variable resistor is improved.

Next, the other ends of the pair of electrodes 24 and the pair of external terminals 33 on the substrate 21 are soldered by attaching a conductive material 24a made of solder to the pair of electrodes 24 on the substrate 21. The pair of outer terminals 33 are electrically connected.

Next, from above the substrate 21, the middle terminal 3
0 through hole 28 of driver plate 25
The driver plate 25 is placed so that the is fitted.

Next, the distal end portion of the cylindrical portion 31 of the middle terminal 30 is swaged, and the driver plate 25 is pivotally mounted on the upper surface of the substrate 21.

The operation of the variable resistor configured as described above according to an embodiment of the present invention will now be described.

A constant voltage is applied to one of the pair of outer terminals 33 and the other is grounded.
2 to an external circuit (not shown). Then, by inserting a mating driver (not shown) into the driver groove 27 of the driver plate 25 and rotating the same, the potential of the middle terminal 30 is set to an arbitrary resistance value.

Here, considering the case where the variable resistor is mounted on a mating substrate (not shown), in the variable resistor according to the embodiment of the present invention, a pair of external The lower end of the terminal 33 is embedded and the other end of the pair of outer terminals 33 is bent at the side edge of the substrate 21 to be electrically connected to the pair of electrodes 24. External terminal 33
Does not move, which facilitates accurate mounting of the variable resistor on the mating substrate (not shown), thereby improving the mountability on the mating substrate (not shown). This has the effect that a variable resistor can be provided.

Further, a variable resistor is connected to a mating substrate (not shown).
Considering a case in which a variable resistor is gripped by a chucking device (not shown) for mounting on a variable resistor according to an embodiment of the present invention, the lower surface of the substrate 21 and the terminal mounting plate 29 And the upper surface of is substantially the same shape, and when the terminal mounting plate 29 is mounted on the substrate 21, the overall shape of the combination of the substrate 21 and the terminal mounting plate 29 is substantially a rectangular parallelepiped. When the variable resistor is gripped by a chucking device (not shown), the board 21 and the terminal mounting plate 29 of the variable resistor can be gripped together, and as a result, the variable resistor is mounted on the mating board. This has the effect that it can be easily performed.

Further, in the variable resistor according to one embodiment of the present invention, a pair of convex portions 21
b, a terminal portion 32 of the middle terminal 30 is disposed between the pair of convex portions 21b, and the terminal portions 32 and the end surfaces of the pair of convex portions 21b are substantially flush with each other. Therefore, when the variable resistor is gripped by the chucking device (not shown), the variable resistor is not tilted and gripped, and as a result, the variable resistor is held at the mating substrate (not shown). This has the effect that it can be reliably mounted on the device.

Further, it is assumed that the variable resistor is mounted on a mating substrate (not shown) and the pair of external terminals 33 are soldered to lands (not shown) of the mating substrate (not shown). As seen from the above, in the variable resistor according to the embodiment of the present invention, the cylindrical portion 31 of the middle terminal 30 is provided.
Is made of SUS301 or the like, which is a material to which solder does not adhere, and the surface of the terminal portion 32 is made of a plating layer (not shown) made of solder, which is a material to which solder adheres. Terminal part 3 of the middle terminal 30 in FIG.
2 is electrically connected to a mating substrate (not shown) by solder, the solder is not erroneously attached to the cylindrical portion 31 of the middle terminal 30, and as a result, the cylindrical portion 31 of the middle terminal 30 is not. Solder does not intervene at the pivotal connection between the
This has an effect that the operation of rotating the driver plate 25 in the variable resistor is stabilized.

In the variable resistor according to the embodiment of the present invention, a configuration in which a pair of concave portions 21a are provided on one side surface of the substrate 21 has been described. However, as shown in FIG. Even if a pair of steps 34 are provided on the side surface, the same effect as in the embodiment of the present invention can be obtained.

In the variable resistor according to one embodiment of the present invention, a pair of recesses 21 a
Has been described, but as shown in FIG.
Instead of providing the pair of recesses 21a on one side surface of the substrate 21, one side surface of the substrate 21 may be formed in a straight line.

[0038]

As described above, the variable resistor according to the present invention has a hollow hole substantially at the center, a horseshoe-shaped resistor on the upper surface, and a pair of electrodes electrically connected to both ends of the resistor. Substrate, rotatably supported on the upper surface of the substrate,
A driver plate having a slider that slides on the resistor and having a through hole substantially in the center, and a cylindrical portion that is inserted through the hollow hole of the substrate and the through hole of the driver plate to pivotally mount the driver plate. And a middle terminal having a terminal portion provided over one side surface from the lower side of the substrate, and a side provided with a terminal portion of the middle terminal on the substrate which is electrically connected to a pair of electrodes on the substrate and the upper surface. And a pair of external terminals provided from the side surface on the side opposite to the lower surface to a lower surface, and a terminal mounting plate is provided so that the upper surface is in contact with the lower surface of the substrate. And a lower end of the pair of external terminals is embedded, and the other end of the pair of external terminals is bent at a side edge of the substrate so as to be electrically connected to the pair of electrodes. According to this configuration, a part of the terminal portion of the middle terminal and the lower end of the pair of external terminals are embedded in the terminal mounting plate, and the other end of the pair of external terminals is connected to the side of the substrate. The external terminals do not move even if an external force is applied to the external terminals because they are bent at the edges and are electrically connected to the pair of electrodes. Therefore, it is possible to provide a variable resistor capable of improving the mountability on a mating substrate.

[Brief description of the drawings]

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

FIG. 2 is a side sectional view of the variable resistor.

FIG. 3 is a top view of the variable resistor.

FIG. 4 is a side view of the variable resistor.

FIG. 5 is a bottom view of the variable resistor.

FIG. 6 is a perspective view showing a pair of outer terminals and a middle terminal in a state before integrally molding a terminal mounting plate of the variable resistor according to the embodiment of the present invention;

FIG. 7 is an exploded perspective view of a variable resistor according to another embodiment of the present invention.

FIG. 8 is an exploded perspective view of a variable resistor according to still another embodiment of the present invention.

FIG. 9 is a side sectional view of a conventional variable resistor.

FIG. 10 is a top view of the variable resistor.

FIG. 11 is a bottom view of the variable resistor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Substrate 21a A pair of recessed part 21b A pair of convex part 22 Hollow hole 23 Resistor 24 A pair of electrodes 25 Driver plate 26 Slider 28 Through hole 29 Terminal mounting plate 30 Medium terminal 31 Cylindrical part 32 Terminal part 33 One pair of external terminals

Claims (6)

[Claims] 1. A substrate having a hollow hole at substantially the center, a horseshoe-shaped resistor on the upper surface, and a pair of electrodes electrically connected to both ends of the resistor, and a rotatable upper surface of the substrate. A driver plate that is supported and has a slider that slides on the resistor and has a through hole substantially at the center; and a driver plate that is inserted through the hollow hole of the substrate and the through hole of the driver plate to pivotally attach the driver plate. A middle terminal having a cylindrical portion to be formed and a terminal portion provided over one side surface from the lower side of the substrate, and a terminal portion of the middle terminal on the substrate which is electrically connected to a pair of electrodes and the upper surface of the substrate. A pair of external terminals provided from a side surface on a side opposite to the provided side to a lower surface, a terminal mounting plate is provided such that an upper surface abuts on a lower surface of the substrate, and the terminal mounting plate is provided on the terminal mounting plate. A part of the terminal part and a lower end of the pair of external terminals are buried, and the other end of the pair of external terminals is bent at a side edge of the substrate to be electrically connected to the pair of electrodes. Variable resistor. 2. The lower surface of the substrate and the upper surface of the terminal mounting plate have substantially the same shape, and when the terminal mounting plate is mounted on the substrate, the entire shape of the substrate and the terminal mounting plate together has a substantially rectangular parallelepiped shape. The variable resistor according to claim 1, wherein the variable resistor is configured as follows. 3. The substrate according to claim 1, wherein a pair of recesses are provided on one side surface of the substrate, and a pair of external terminals are provided in the pair of recesses.
The variable resistor as described. 4. The variable resistor according to claim 1, wherein a conductive material is provided at a connection between the other end of the pair of external terminals and the pair of electrodes on the substrate. 5. The variable resistor according to claim 1, wherein the surface of the cylindrical portion of the middle terminal is made of a material to which solder does not adhere, and the surface of the terminal portion is made of a material to which solder adheres. . 6. A pair of convex portions are provided on one side surface of the substrate, a terminal portion of a middle terminal is provided between the pair of convex portions, and the terminal portion and the tip end surfaces of the pair of convex portions are provided. 2. The variable resistor according to claim 1, wherein the variable resistor is configured to be substantially in the same plane.