JP2010074031A - Variable resistor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a variable resistor excellent in reliability of which the output is not brought into an open state in the case that turning torque generated by a driver is large. <P>SOLUTION: The variable resistor is so configured that a center angle formed of a first slider 41 and a second slider 42 viewed from the center of a through-hole 39 of a driver plate 38 becomes larger than a center angle formed by an end 36 in the peripheral direction of a power supply electrode 33 and the end 36 in the peripheral direction of a GND electrode 34 which are viewed from the center of a hollow opening 35 of a substrate 31. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a variable resistor used in various electronic devices.

  Conventional variable resistors of this type have been configured as shown in FIGS.

  7 is an exploded perspective view of a conventional variable resistor, FIG. 8 is a sectional view of the variable resistor, FIG. 9 is a top view of the variable resistor, and FIG. 10 is a bottom view of the variable resistor.

  As shown in FIGS. 7 to 10, the conventional variable resistor includes a substrate 2 made of a material such as ceramic having a resistor 1 on the upper surface, and SUS304 or the like rotatably disposed on the substrate 2. A driver plate 3 made of metal; a metal middle terminal 4 pivotally attached to the driver plate 3 and electrically connected to the driver plate 3; provided on a side surface of the substrate 2; It is comprised by the resistor 1 and the metal outer terminal 5 electrically connected.

  The substrate 2 made of a material such as ceramic is provided with a horseshoe-shaped resistor 1 on the upper surface, and a protrusion 6 that is located on the inner peripheral side of the resistor 1 and protrudes from the outer periphery toward the center. The step portion 7 is provided, and the hollow hole 8 is provided in the approximate center of the step portion 7.

  The driver plate 3 made of a metal such as SUS304 is provided with a through hole 9 at a substantially central portion and a protruding portion 10 protruding toward the stepped portion 7 of the substrate 2. A slider 11 is formed on the side of the projecting portion 10, and the slider 11 slides on the resistor 1 provided on the upper surface of the substrate 2.

  Further, a driver groove 12 into which an adjustment driver (not shown) is inserted is provided above the projecting portion 10 in parallel with the substrate 2. Further, the stopper portion 13 is formed on the side surface of the protruding portion 10 by pressing the side surface.

  Further, the metal middle terminal 4 is inserted into the hollow hole 8 of the substrate 2 and the through hole 9 in the protruding portion 10 of the driver plate 3 from the lower surface of the substrate 2 on one end side, and the distal end portion is narrowed. A cylindrical portion 14 for pivotally mounting the driver plate 3 is provided, and a terminal portion 15 is provided on the other end side from the lower surface of the substrate 2 to one side surface. The metal outer terminal 5 is made of silver or the like and is electrically connected to the resistor 1 at least on the upper surface of the substrate 2.

  Next, the operation of the conventional variable resistor configured as described above will be described.

  The conventional variable resistor described above is connected to an external circuit by an external terminal 5 connected to the resistor 1 and an intermediate terminal 4 connected to the slider 11, and is a driver provided on the driver plate 3. By inserting a screwdriver or the like into the groove 12 and rotating the driver plate 3, the resistance value of the middle terminal 4 of the variable resistor can be set to an arbitrary value. In this case, the stopper portion 13 also rotates together with the driver plate 3. However, when the stopper portion 13 is rotated to a certain angle, the stopper portion 13 comes into contact with the protrusion 6 provided on the substrate 2, and the rotation range is limited. It is what is done. In this way, by limiting the rotation range, the slider 11 in the driver plate 3 is prevented from reaching a portion where the horseshoe-shaped resistor 1 provided on the substrate 2 is not disposed. It was composed.

As prior art document information relating to the invention of this application, for example, Patent Document 1 is known.
JP-A-8-273908

  However, in the conventional configuration described above, in order to prevent the slider 11 in the driver plate 3 from reaching the portion where the horseshoe-shaped resistor 1 provided on the substrate 2 is not disposed, the driver plate 3 In this case, the stopper portion 13 in the driver plate 3 is destroyed when the rotational torque generated by the driver is large. In such a case, the slider 11 in the driver plate 3 is located at a portion where the resistor 1 provided on the substrate 2 is not disposed, so that the output of the variable resistor is in an open state. It had the problem of becoming.

  The present invention solves the above-described conventional problems, and when the rotational torque generated by the driver is large, the output of the variable resistor is not opened, and the variable resistor is excellent in terms of reliability. Is intended to provide.

  In order to achieve the above object, the present invention has the following configuration.

  According to the first aspect of the present invention, there is provided a substrate in which a hollow hole is provided substantially from the upper surface to the lower surface at the center, a horseshoe-shaped resistor is provided on the upper surface, and a pair of electrodes are provided at both ends of the resistor. In addition to providing at least two sliders in sliding contact with the resistor in the substrate, the driver plate provided with a driver groove and a through hole, and the hollow plate in the substrate and the through hole in the driver plate are inserted to rotate the driver plate. An intermediate terminal provided with a cylindrical portion that is pivotally mounted and a terminal portion disposed from the lower surface to one side surface of the substrate, and a side surface facing the one side surface provided with the terminal portion of the intermediate terminal on the substrate. Provided with a pair of external terminals electrically connected to the electrodes on the substrate, and two slides viewed from the center of the through hole in the driver plate. The center angle that connects the children is configured to be larger than the center angle that connects the circumferential ends of the pair of electrodes as viewed from the center of the hollow hole in the substrate. Since the center angle connecting the two sliders viewed from the center of the hole is configured to be larger than the center angle connecting the circumferential ends of the pair of electrodes viewed from the center of the hollow hole in the substrate. When the rotational torque generated by the driver is large, even if the slider in the driver plate is located in a portion where the resistor provided on the substrate is not disposed, either one of the two sliders or Both will be located in either one or both of a pair of electrodes, and this has the effect that the output signal from a middle terminal will not be in an open state. Than is.

  As described above, the variable resistor according to the present invention is provided with a substrate provided with a hollow hole from the upper surface to the lower surface in the approximate center, a horseshoe-shaped resistor on the upper surface, and a pair of electrodes on both ends of the resistor. In addition to providing at least two sliders in sliding contact with the resistor in the substrate, the driver plate provided with a driver groove and a through hole, and the hollow plate in the substrate and the through hole in the driver plate are inserted to rotate the driver plate. An intermediate terminal provided with a cylindrical portion that is pivotally mounted and a terminal portion disposed from the lower surface to one side surface of the substrate, and a side surface facing the one side surface provided with the terminal portion of the intermediate terminal on the substrate. Provided with a pair of external terminals electrically connected to the electrodes on the substrate, and two seen from the center of the through hole in the driver plate Since the central angle connecting the moving elements is larger than the central angle connecting the circumferential ends of the pair of electrodes viewed from the center of the hollow hole in the substrate, the rotational torque generated by the driver is If it is large, even if the slider in the driver plate is located in a portion where the resistor provided on the substrate is not disposed, either one or both of the two sliders are Since the output signal from the middle terminal will not be in an open state because it is located in either one or both, it is possible to provide a variable resistor that is excellent in terms of reliability. It has an excellent effect.

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

  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, and FIG. FIG. 5 is a bottom view of the driver plate in the variable resistor.

  1 to 5, reference numeral 31 denotes a substrate made of a material such as ceramic. The substrate 31 is provided with a horseshoe-shaped resistor 32 on its upper surface, and one end of the resistor 32 is provided with a power supply electrode 33 made of Ag. The other end is provided with a GND electrode 34 made of Ag. Further, the substrate 31 is provided with a hollow hole 35 from the upper surface to the lower surface, and as shown in FIG. 4, the circumferential direction between the power supply electrode 33 and the GND electrode 34 viewed from the center of the hollow hole 35 in the substrate 31 is provided. The central angle connecting the end portions 36 is configured to be about 20 degrees, and the boundary portion 37 between the resistor 32 and the power supply electrode 33 viewed from the center of the hollow hole 35 in the substrate 31 and the circumferential end of the power supply electrode 33. The central angle connecting the portion 36 is 30 degrees. Similarly, the central angle connecting the boundary portion 37 between the resistor 32 and the GND electrode 34 and the end portion 36 in the circumferential direction of the GND power electrode 34 as viewed from the center of the hollow hole 35 in the substrate 31 is also provided. It is configured at 30 degrees.

  Reference numeral 38 denotes a driver plate made of a metal such as SUS304. As shown in FIG. 5, the driver plate 38 has a through hole 39 in the approximate center and a protruding portion 40 protruding toward the hollow hole 35 of the substrate 31. The first slider 41 and the second slider 42 that are in sliding contact with the resistor 32 provided on the upper surface of the substrate 31 and the driver groove 43 parallel to the substrate 31 are provided. And the central angle which connects the 1st slider 41 and the 2nd slider 42 seen from the center of the through-hole 39 in this driver plate 38 is comprised so that it may be about 25 degree | times.

  Reference numeral 44 denotes a metal middle terminal. The middle terminal 44 is inserted into the hollow hole 35 of the substrate 31 and the through hole 39 in the protruding portion 40 of the driver plate 38 from the lower surface of the substrate 31 on one end side. A cylindrical portion 45 for pivotally mounting the plate 38 is provided, and a terminal portion 46 disposed from the lower surface of the substrate 31 to one side surface is provided on the other end side.

  Reference numeral 47 denotes a pair of external terminals made of Ag. The pair of external terminals 47 are electrically connected to the power supply electrode 33 and the GND electrode 34 on the substrate 31 and are connected to the terminals of the intermediate terminal 44 on the substrate 31. It is provided on one side opposite to the one side on which the portion 46 is provided.

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

  First, when manufacturing the driver plate 38, a band-shaped hoop material (not shown) is punched to form a pair of driver grooves 43, and punching is performed while drawing between the pair of driver grooves 43. A protrusion 40 having a through-hole 39 is formed in the approximate center.

  Next, the first slider 41 and the second slider 42 are punched and formed on the outer periphery of the protrusion 40.

  Finally, the cylindrical portion 45 of the middle terminal 44 is inserted into the hollow hole 35 and the through hole 39 of the driver plate 38 from the lower surface of the substrate 31, the tip end portion of the cylindrical portion 45 is squeezed, and the driver plate 38 is rotated to the substrate 31. Pivot freely.

  Next, the operation of the variable resistor according to the embodiment of the present invention manufactured as described above will be described.

  The variable resistor described above is connected to an external circuit by an external terminal 47 connected to the resistor 32 of the substrate 31 via the power supply electrode 33 and the GND electrode 34 and a middle terminal 44 connected to the driver plate 38. The resistance value of the middle terminal 44 of the variable resistor is set to an arbitrary value by inserting a driver or the like (not shown) into the driver groove 43 provided in the driver plate 38 and rotating the driver plate 38. Is something that can be done.

  Here, consider the case where the driver plate 38 in the variable resistor is rotated 360 degrees. As shown in FIG. 6, the point where the midpoint of the total resistance of the resistor 32 is located at the midpoint between the first slider 41 and the second slider 42 on the driver plate 38 is 0 degree. And Then, since the lower potential of the first slider 41 and the second slider 42 is output from the middle terminal 44, the second contact with the one closer to the GND electrode 34 is performed. About 46%, which is the potential of the slider 42, is output. From this state, the driver plate 38 is rotated rightward by a driver (not shown). Then, as the driver plate 38 rotates, the potential of the second slider 42 increases. When the driver plate 38 rotates 152 degrees, the second slider 42 is positioned at the boundary 37 between the resistor 32 and the power electrode 33. Further, when the driver plate 38 rotates rightward and rotates 178 degrees, and the first slider 41 is positioned at the end 36 in the circumferential direction of the GND electrode 34, the potential of the first slider 41 is increased. Therefore, the output signal from the middle terminal 44 is 0%. Further, when the driver plate 38 is further rotated to the right and rotated 233 degrees, and the second slider 42 is positioned at the boundary portion 37 between the resistor 32 and the GND electrode 34, the center is sequentially changed thereafter. The output signal from terminal 46 increases and increases linearly up to 360 degrees.

  As described above, in one embodiment of the present invention, the central angle 25 degrees connecting the first slider 41 and the second slider 42 as viewed from the center of the through hole 39 in the driver plate 38 is the substrate. 31 is configured to be larger than a central angle of 20 degrees connecting the circumferential end 36 of the power supply electrode 33 and the circumferential end 36 of the GND electrode 34 as viewed from the center of the hollow hole 35 in the driver 31. When the rotational torque generated by (not shown) is large, a portion of the driver plate 38 where the first slider 41 and the second slider 42 provided on the substrate 31 are not disposed. 1 or 2, either one or both of the first slider 41 and the second slider 42 are positioned on either one or both of the power supply electrode 33 and the GND electrode 34. Become this Accordingly, the output signal from the intermediate terminal 44 is no longer able to become an open state, in which the effect of being able to provide a variable resistor which is superior in reliability can be obtained.

  The variable resistor according to the present invention provides a variable resistor that is excellent in terms of reliability without the output of the variable resistor being opened when the rotational torque generated by the driver is large. In particular, it is useful as a variable resistor used in various electronic devices.

The disassembled perspective view of the variable resistor in one embodiment of this invention Side sectional view of the same variable resistor Top view of the same variable resistor Top view of the substrate in the same variable resistor Bottom view of driver plate in the same variable resistor Output characteristics diagram of the same variable resistor Exploded perspective view of a conventional variable resistor Cross section of the variable resistor Top view of the same variable resistor Bottom view of the variable resistor

Explanation of symbols

31 Substrate 32 Resistor 33 Power Supply Electrode 34 GND Electrode 35 Hollow Hole 36 Circumferential End 37 Boundary 38 Driver Plate 39 Through Hole 41 First Slider 42 Second Slider 44 Middle Terminal 45 Cylinder 46 Terminal section 47 External terminal

Claims (1)

A substrate in which a hollow hole is provided from the upper surface to the lower surface in the approximate center, a horseshoe-shaped resistor is provided on the upper surface, and a pair of electrodes are provided on both ends of the resistor, and a slider that is in sliding contact with the resistor on the substrate At least two, a driver plate provided with a driver groove and a through hole, a hollow portion in the substrate and a cylindrical portion inserted through the through hole in the driver plate and pivotally attached to the driver plate, and the substrate An intermediate terminal provided with a terminal portion disposed from the lower surface to one side surface, and provided on one side surface of the substrate opposite to the one side surface provided with the terminal portion of the intermediate terminal, and electrically connected to the electrode on the substrate A central angle connecting two sliders as viewed from the center of the through hole in the driver plate, Variable resistor configured to be larger than the center angle connecting the circumferential direction of the end portions of the pair of electrodes when viewed from the center of the holes.