JP4795373B2 - Variable resistor - Google Patents

Description

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

  This type of conventional variable resistor has a configuration as shown in FIGS.

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

  FIG. 15 is a side sectional view of a conventional variable resistor, FIG. 16 is a top view of the variable resistor, and FIG. 17 is a bottom view of the variable resistor.

  15 to 17, reference numeral 1 denotes a substrate made of an insulating material such as a rectangular parallelepiped ceramic. The substrate 1 has a hollow hole 2 in the approximate center, a horseshoe-shaped resistor 3 on the top surface, and a bottom surface. The middle terminal engaging groove 4 is provided in the inner side. Electrodes 5 are provided on both ends of the resistor 3 of the substrate 1. Reference numeral 6 denotes a metal driver plate. The driver plate 6 is rotatably supported on the upper surface of the substrate 1 and is provided with a slider 7 on a side surface. The slider 7 is connected to the resistance of the substrate 1. It is slid on the body 3. The driver plate 6 is provided with a driver groove 8 on the upper surface and a through hole 9 at substantially the center. Reference numeral 10 denotes a metal middle terminal. The middle terminal 10 is provided with a cylindrical portion 11. The cylindrical portion 11 is inserted into the hollow hole 2 of the substrate 1 and the through hole 9 of the driver plate 6. Is pivotally attached. Further, the middle terminal 10 is provided with a terminal portion 12, and this terminal portion 12 is provided from the bottom surface of the substrate 1 to one side surface, and the terminal portion 12 is provided at the middle terminal engagement provided on the bottom surface of the substrate 1. By inserting into the groove 4, the rotation of the middle terminal 10 is restricted. Reference numeral 13 denotes a pair of external terminals made of metal. The external terminals 13 are provided from the side surface opposite to the side where the terminal portion 12 of the middle terminal 10 of the substrate 1 is provided to the lower surface, The upper surface is electrically connected to the electrode 5.

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

  A constant voltage is applied to one of the pair of external terminals 13, the other is grounded, and the terminal portion 12 of the middle terminal 10 is connected to an external circuit (not shown). A potential driver (not shown) is inserted into the driver groove 8 of the driver plate 6 and rotated to set the potential of the middle terminal 10 to an arbitrary resistance value.

As prior art document information relating to the invention of this application, for example, Patent Document 1 is known.
JP-A-3-270103

  However, in the conventional configuration, there is no positioning when the external terminal 13 is assembled to the substrate 1 and there is no means for fixing the external terminal 13 to the substrate 1 before the external terminal 13 is soldered to the substrate 1. The external terminal 13 is easy to move from the substrate 1, and as a result, it has been difficult to assemble the variable resistor with high accuracy.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object of the present invention is to provide a variable resistor that can be assembled with high accuracy and can improve assemblability.

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

The invention according to claim 1 of the present invention has a hollow hole substantially at the center and has a horseshoe-shaped resistor on the upper surface and electrodes provided on both ends of the resistor, and penetrates from the upper surface to the lower surface. A substrate having two fixing holes, 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 in the approximate center, and a hollow hole in the substrate And an intermediate terminal having a cylindrical portion inserted through the through hole of the driver plate and pivotally attached to the driver plate, and a terminal portion provided from the bottom surface of the substrate to one side surface, and the electrode on the upper surface of the substrate. And an outer portion having a terminal portion provided from the side surface to the lower surface of the substrate on the side facing the terminal portion of the middle terminal and an insertion portion inserted into the fixing hole of the substrate. And a bending portion that is bent at a ridge line between the upper surface and the side surface of the substrate and that is in contact with a portion adjacent to the fixing hole on the upper surface of the substrate, and at the end of the terminal portion of the outer terminal. The bent portion and the protruding portion are different from each other by 180 degrees or in the same direction so that the protruding portion protruding from the fixing hole of the substrate in the terminal insertion portion does not overlap the bent portion of the terminal portion. Is bent along the upper surface of the substrate, and further joined to the bent portion by solder. According to this configuration, the end portion of the terminal portion of the outer terminal is bent at the ridge line between the upper surface and the side surface of the substrate. and provided with a contact with the bent portion at a position adjacent to the fixed holes in the upper surface of the substrate, so that the protrusion protruding from the fixing hole of the substrate does not overlap with the folded portion of the terminal portion, wherein Ri bend the the protrusion 180 degrees different directions and, or, in the same direction, are bent along the upper surface of the substrate, since a structure joined by further said bent portion and the solder, the external terminal on the substrate It has the effect of being able to be firmly fixed.

As described above, the variable resistor of the present invention has a hollow hole in the substantially center, has a horseshoe-shaped resistor on the upper surface, and electrodes provided on both ends of the resistor, and penetrates at least from the upper surface to the lower surface. A substrate having two fixing holes, 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 in the approximate center, and a hollow hole in the substrate And an intermediate terminal having a cylindrical portion inserted through the through hole of the driver plate and pivotally attached to the driver plate, and a terminal portion provided from the bottom surface of the substrate to one side surface, and the electrode on the upper surface of the substrate. And a terminal portion provided from the side surface to the lower surface of the substrate on the side facing the terminal portion of the middle terminal, and an insertion portion inserted into the fixing hole of the substrate And a bent portion that is bent at a ridge line between the upper surface and the side surface of the substrate and is in contact with a portion adjacent to the fixing hole on the upper surface of the substrate. The bent portion and the protruding portion are different from each other by 180 degrees or in the same direction so that the protruding portion protruding from the fixing hole of the substrate in the terminal insertion portion does not overlap the bent portion of the terminal portion. Is bent along the upper surface of the substrate, and further joined to the bent portion by solder. According to this configuration, the end portion of the terminal portion of the outer terminal is bent at the ridge line between the upper surface and the side surface of the substrate. and provided with a contact with the bent portion at a position adjacent to the fixed holes in the upper surface of the substrate, so that the protrusion protruding from the fixing hole of the substrate does not overlap with the folded portion of the terminal portion, before The bent portion and the projecting portion and the mutually 180 ° different directions or in the same direction, are bent along the upper surface of the substrate, since a structure joined by further said bent portion and the solder firmly the outer terminal to the substrate It is possible to provide a variable resistor that can be firmly attached to the substrate.

  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, and FIG. 3 is a perspective view of a lower surface side of the variable resistor.

  1 to 3, reference numeral 21 denotes a substrate made of a rectangular parallelepiped ceramic or the like. The substrate 21 has a hollow hole 22 in the approximate center, a horseshoe-shaped resistor 23 is provided on the upper surface, and the resistor 23 A pair of electrodes 24 are provided at both ends. The substrate 21 is provided with a pair of cylindrical fixing holes 25 located in the vicinity of the electrode 24 from the upper surface to the lower surface of the substrate 21. Reference numeral 26 denotes a metal driver plate. The driver plate 26 is rotatably supported on the upper surface of the substrate 21, and a slider 27 is provided on a side surface. The slider 27 is a resistance of the substrate 21. It slides on the body 23. The driver plate 26 is provided with a driver groove 28 on the upper surface and a through hole 29 substantially at the center. Reference numeral 30 denotes a metal middle terminal. The middle terminal 30 is provided with a cylindrical portion 31 at one end, and the cylindrical portion 31 is inserted into the hollow hole 22 of the substrate 21 and the through hole 29 of the driver plate 26, and the driver A plate 26 is pivotally mounted on the upper surface of the substrate 21. A terminal portion 32 is provided at the other end of the middle terminal 30, and this terminal portion 32 is provided from the bottom surface of the substrate 21 to one side surface. The terminal portion 32 of the middle terminal 30 is provided with, for example, a rectangular resin reservoir hole 33 located in the vicinity of the cylindrical portion 31 of the middle terminal 30 on the lower surface side of the substrate 21. A step portion 34 is provided on the opposite side to the cylindrical portion 31 of the accumulation hole 33. Further, as shown in FIG. 4, a contact portion 36 that contacts the counterpart circuit board 35 is provided outside the step portion 34 of the terminal portion 32 of the middle terminal 30. Reference numeral 37 denotes a pair of external terminals made of metal. The external terminal 37 is provided with a terminal portion 38. The terminal portion 38 is electrically connected to the electrode 24 on the upper surface of the substrate 21, and the intermediate terminal. It is provided from the side surface to the lower surface of the substrate 21 on the side facing the side on which the 30 terminal portions 32 are provided. Further, a lower insertion portion 39 is provided at one end of the outer terminal 37, and the lower insertion portion 39 is inserted into the fixing hole 25 of the substrate 21 from below and provided at the other end of the outer terminal 37. The outer terminal 37 is fixed to the substrate 21 by inserting the upper insertion portion 40 into the fixing hole 25 of the substrate 21 from above. The thickness of the terminal portion 32 of the middle terminal 30 is smaller than the thickness of the terminal portion 38 of the outer terminal 37, and the bottom surface of the terminal portion 38 of the outer terminal 37 and the contact portion 36 of the middle terminal 30 are the same. A space 41 is provided below and around the cylindrical portion 31 of the middle terminal 30. Reference numeral 42 denotes a resin that cures when irradiated with ultraviolet rays. This resin 42 is provided in the resin reservoir hole 33 of the middle terminal 30 so as to prevent the middle terminal 30 from rotating.

  Next, the assembly method of the variable resistor according to the embodiment of the present invention configured as described above will be described with reference to the drawings.

  FIGS. 5A to 5D and FIGS. 6A to 6D are assembly process diagrams showing a state in which the variable resistor according to the embodiment of the present invention is assembled.

  First, as shown in FIG. 5A, a substrate 21 having a horseshoe-shaped resistor 23 and a pair of electrodes 24 printed on both ends of the resistor 23 is passed through a baking furnace 43 in advance. Resistor 23 and electrode 24 are baked onto substrate 21.

  Next, as shown in FIG. 5B, the substrate 21 on which the resistor 23 and the electrode 24 are baked is prepared above the hoop 44 to which the middle terminal 30 and the outer terminal 37 are fixed.

  Next, as shown in FIG. 5C, the hollow hole 22 of the substrate 21 is fitted into the cylindrical portion 31 of the middle terminal 30 from above the hoop 44, and the lower insertion portion 39 and the substrate of the outer terminal 37 are fitted. The substrate 21 is placed so that the fixing holes 25 of the 21 are fitted.

  Next, as shown in FIG. 5D, after the outer terminal 37 is bent at the ridgeline of the upper surface and the side surface of the substrate 21 and the upper insertion portion 40 of the outer terminal 37 is inserted into the fixing hole 25 from above the substrate 21, The substrate 21 and the external terminal 37 are fixed by soldering (not shown).

  Next, as shown in FIG. 6A, the driver plate 26 is mounted from above the substrate 21 to which the outer terminal 37 is fixed so that the through hole 29 of the driver plate 26 is fitted to the cylindrical portion 31 of the middle terminal 30. Place.

  Next, as shown in FIG. 6B, the tip of the cylindrical portion 31 of the middle terminal 30 is caulked to pivotally attach the driver plate 26 to the upper surface of the substrate 21.

  Next, as shown in FIG. 6C, the variable resistor pivotally attached to the driver plate 26 is turned upside down, and the resin that is cured by irradiation of ultraviolet rays in the resin reservoir hole 33 of the middle terminal 30 and its periphery. 42 is applied.

  Finally, as shown in FIG. 6 (d), the resin reservoir hole 33 (not shown) to which the resin 42 (not shown) is applied and its periphery are irradiated with wavelengths 184.9 to 365 by the ultraviolet irradiation device 45. The resin 42 (not shown) is cured by irradiating 0.0 nm ultraviolet light, and the middle terminal 30 (not shown) is fixed to the substrate 21 (not shown).

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

  A constant voltage is applied to one of the pair of external terminals 37, the other is grounded, and the terminal portion 32 of the middle terminal 30 is connected to an external circuit (not shown). Then, the other terminal driver (not shown) is inserted into the driver groove 28 of the driver plate 26 and rotated, thereby setting the potential of the middle terminal 30 to an arbitrary resistance value.

  Further, when the variable resistor according to the embodiment of the present invention is mounted on the counterpart circuit board, in the embodiment of the present invention, as shown in FIG. Since the step portion 34 is provided in the middle terminal 30 so that the bottom surface portion of the middle terminal 30 and the outer terminal 37 are positioned on the same plane, the middle terminal 30 and the outer terminal 37 are made smaller than the thickness. As a result, a space 41 is formed between the lower circuit board 35 and the stepped part such as the wiring pattern 46 on the other circuit board 35 when the variable resistor is placed on the other circuit board 35. Even in the case where there is, the variable resistor is formed by positioning the step such as the wiring pattern 46 in the space 41 so that only the bottom surface portions of the middle terminal 30 and the outer terminal 37 abut against the counterpart circuit board 35. That is placed at an angle No longer, as a result, and has a effect that the variable resistor can be placed accurately on the counterpart circuit substrate 35.

  In the variable resistor according to the embodiment of the present invention, the outer terminal 37 is inserted into the fixing hole 25 of the substrate 21 from below and the lower insertion portion 39 inserted into the fixing hole 25 of the substrate 21 from above. 7 and 8, the insertion portion 47 of the outer terminal 37 is inserted into the fixing hole 25 of the substrate 21 from below as shown in FIGS. A U-shaped portion 49 is provided on the outer terminal 37 so as to surround the protruding portion 48 protruding from the fixing hole 25 of the substrate 21 in the insertion portion 47, and the U-shaped portion 49 and the protruding portion 48 in the insertion portion 47 are provided. May be fixed by soldering. As described above, the protrusion 48 and the U-shaped portion 49 of the outer terminal 37 are fixed to each other by soldering, so that the protrusion 48 and the U-shaped portion 49 are integrated with each other. It has the effect of being firmly fixed.

  In the variable resistor according to the embodiment of the present invention, the resin reservoir hole 33 coated with the resin 42 and its periphery are irradiated with ultraviolet rays, and the middle terminal 30 is fixed to the substrate 21. 9. As shown in FIG. 10, a concave middle terminal contact portion 50 is provided on one side surface of the substrate 21, and the terminal portion 32 of the middle terminal 30 is connected to the middle terminal contact portion 50 on one side surface of the substrate 21. The middle terminal 30 may be fixed to the substrate 21 by being inserted. At this time, since both side surfaces of the terminal portion 32 of the middle terminal 30 abut on the middle terminal abutting portion 50 of the substrate 21, even if the driver plate 26 is rotated for adjustment, the terminal portion 32 of the middle terminal 30 does not move. It has the effect that it does not rotate.

  Further, as shown in FIGS. 9 and 10, if the middle terminal contact portion 50 of the substrate 21 is formed in a concave shape, it becomes easy to provide the concave middle terminal contact portion 50 on the substrate 21, and as a result, The middle terminal contact portion 50 can be easily formed.

  Furthermore, in the variable resistor according to the embodiment of the present invention, the outer terminal 37 is inserted from below into the fixing hole 25 of the substrate 21 and the lower insertion portion 39 inserted into the fixing hole 25 of the substrate 21 from above. However, as shown in FIGS. 11 and 12, the end portion 52 of the terminal portion 38 of the outer terminal 37 is formed by a ridge line between the upper surface and the side surface of the substrate 21. The bent portion 53 is provided by being bent and brought into contact with the upper surface of the substrate 21, and the protruding portion 55 protruding from the fixing hole 25 of the substrate 21 in the insertion portion 54 to be inserted into the fixing hole 25 of the substrate 21 from below is the terminal portion. The outer terminal 37 may be fixed to the substrate 21 by being bent along the upper surface of the substrate 21 so as not to overlap the bent portion 53 of the substrate 38. In this case, the bent portion By joining 3 and the projecting portion 55 by solder, and has a effect that the outer terminal 37 can be firmly fixed to the substrate 21.

  In FIGS. 11 and 12, the bent portion 53 and the protruding portion 55 are bent in directions different from each other by 180 degrees, but the bent portion 53 and the protruding portion 55 may be bent in the same direction.

  Furthermore, in the variable resistor according to the embodiment of the present invention, the outer terminal 37 is inserted into the fixing hole 25 of the substrate 21 from below, and the lower insertion portion 39 is inserted into the fixing hole 25 of the substrate 21 from above. However, as shown in FIG. 13 and FIG. 14, the terminal portion 38 having a pair of substantially parallel tip portions 56 on the outer terminal 37 and the substrate 21 are fixed. An insertion portion 54 to be inserted into the hole 25 is provided, and a pair of substantially parallel tip portions 56 in the terminal portion 38 of the outer terminal 37 are bent at a ridge line between the upper surface and the side surface of the substrate 21 to contact the upper surface of the substrate 21. By providing the bent portion 57, the protruding portion 58 protruding from the fixing hole 25 of the substrate 21 in the insertion portion 54 is positioned between the bent portions 57 of the pair of substantially parallel tip portions 56 in the terminal portion 38. The outer terminal 37 may be fixed to the substrate 21 by being bent along the upper surface of the substrate 21. According to this configuration, the outer terminal 37 protrudes from the fixing hole 25 of the substrate 21 in the insertion portion 54. Since the protruding portion 58 is bent along the upper surface of the substrate 21 so as to be positioned between the bent portions 57 of the pair of substantially parallel tip portions 56 in the terminal portion 38, both side surfaces of the protruding portion 58 are bent. As a result, before the outer terminal 37 is soldered, the pair of substantially parallel tip ends even if a rotational moment is applied to the terminal portion 38 around the insertion portion 54 before the outer terminal 37 is soldered. Due to the contact between the bent portion 57 of the portion 56 and the side surface of the protruding portion 58, there is an effect that the position shift due to the rotation of the outer terminal 37 does not occur.

  The variable resistor according to the present invention has an effect that it can be assembled with high accuracy and the assemblability can be improved, and is particularly 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 Perspective view of the bottom side of the variable resistor Side sectional view showing a state in which the variable resistor is mounted on the counterpart circuit board (A)-(d) Assembly process figure of variable resistor in one embodiment of this invention (A)-(d) Assembly process drawing of the variable resistor The exploded perspective view of the variable resistor in other embodiments of the present invention Perspective view of the variable resistor The exploded perspective view of the variable resistor in other embodiments of the present invention Side sectional view of the same variable resistor The exploded perspective view of the variable resistor in other embodiments of the present invention The exploded perspective view which shows the state which fixed the external terminal to the board | substrate of the variable resistor The exploded perspective view of the variable resistor in other embodiments of the present invention The exploded perspective view which shows the state which fixed the external terminal to the board | substrate of the variable resistor Side sectional view of a conventional variable resistor Top view of the same variable resistor Bottom view of the variable resistor

DESCRIPTION OF SYMBOLS 21 Board | substrate 22 Hollow hole 23 Resistor 24 Electrode 25 Fixing hole 26 Driver plate 27 Slider 29 Through-hole 30 Middle terminal 31 Cylindrical part 32 Terminal part 37 Outer terminal 38 Terminal part 39 Lower insertion part 40 Upper insertion part 52 End part 53 Bending part 54 Inserting part 55 Protruding part

Claims (1)

A substrate having a hollow hole substantially in the center and having a horseshoe-shaped resistor on the upper surface and electrodes provided on both ends of the resistor and having at least two fixing holes penetrating from the upper surface to the lower surface; A driver plate rotatably supported on the upper surface and having a slider that slides on the resistor and having a through hole in the approximate center, and a driver inserted through the hollow hole of the substrate and the through hole of the driver plate A middle terminal having a cylindrical portion pivotally attached to the plate and a terminal portion provided from the bottom surface of the substrate to one side surface; and a terminal portion of the middle terminal electrically connected to the electrode on the upper surface of the substrate; A terminal portion provided from the side surface to the lower surface of the substrate on the opposite side, and an external terminal having an insertion portion inserted into the fixing hole of the substrate, the terminal portion of the external terminal A bent portion that is bent at a ridge line between the upper surface and the side surface of the substrate and is in contact with a portion adjacent to the fixing hole on the upper surface of the substrate is provided at the end, and the protruding portion protrudes from the fixing hole of the substrate in the insertion portion of the external terminal The bent portion and the protruding portion are bent along the upper surface of the substrate in directions different from each other by 180 degrees or in the same direction so that the protruding portion does not overlap with the bent portion of the terminal portion. A variable resistor that is joined with solder.

Images