JP2008135558A - Rotary variable resistor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary variable resistor which substantially improves the linearity between the rotation position and the output of a rotor to carry out highly precise detection. <P>SOLUTION: The rotary variable resistor includes a resistor board 1 on which a resistance pattern 2 is formed, the rotor 3 which has an engaging portion 3a receiving a torque from a rotating operation member and is capable of rotating relative to the resistor board 1, and a support member 5 which holds a slider 4 coming in sliding contact with the resistance pattern 2 and rotates together with the rotor 3. The rotor 3 and the support member 5 are brought in pressure contact with each other by the resilience of a washer 6. The support member 5 is provided with an adjusting recession 5c exposed to the outside. When the rotor 3 is aligned with the resistor board 1 at the stage of assembling, the support member 5 is forcibly rotated via the adjusting recession 5c to adjust the relative position of the support member 5 in a rotation direction relative to the rotor 3. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rotary variable resistor that outputs an electrical signal corresponding to a rotational position by sliding a rotatable slider on a resistor pattern, and in particular, the rotational position and output of a rotationally driven rotor. The present invention relates to a rotary variable resistor that has a good linearity with respect to a value and can be detected with high accuracy.

In a rotary variable resistor in which a rotatable slider is in sliding contact with a resistor pattern, an electrical signal corresponding to the contact position of the slider with respect to the resistor pattern can be output. The rotational position of the slider can be detected. A conventional rotary variable resistor of this type is, for example, as disclosed in Patent Document 1, a resistance substrate provided with a resistor pattern and terminals, and a slider receiver ( And a slider receiver that is rotatably supported with respect to the resistance substrate. Generally, a current collector pattern is provided concentrically with the resistor pattern on the resistor substrate, and a slider is slidably contacted with both patterns, and both ends of the resistor pattern and the current collector pattern are provided. The terminal is derived from each. In addition, a non-circular engagement hole is formed at the center of the slider receiver. By engaging the engagement shaft with a drive shaft of a rotation operation member such as an operation knob, the rotation operation member A rotational force is applied to the slider receiver. Therefore, after mounting each terminal provided on the resistance board by soldering to the land of the wiring board, when the slider receiver is rotationally driven through the drive shaft of the rotation operation member, the slider is accompanied by resistance. In order to slide on the body pattern and the current collector pattern, the resistance value output from each terminal changes.
Japanese Patent Laying-Open No. 2003-7516 (page 3-4, FIG. 4)

  By the way, when high detection accuracy is required like a rotary variable resistor used for a feedback sensor or the like, the linearity between the rotational position of the slider receiver (engagement portion) and the output value is extremely important. However, since the positional deviation at the time of printing the resistor pattern on the resistance substrate and the positional deviation at the time of attaching the slider to the slider receptacle cannot be completely eliminated, the conventional rotary variable resistor described above However, it was difficult to avoid a slight error in the correlation between the rotational position of the slider receiver and the output value. That is, in order to accurately detect the rotational position of the slider receiver from the output value, the relative position of the resistor pattern and the slider attached to the slider receiver is not shifted in the rotational operation direction in the initial state. However, since it is difficult to perform printing and assembly so that such misalignment does not occur at all, it is necessary to allow for some detection errors in the conventional rotary variable resistor in advance. There was a limit to conversion.

  The present invention has been made in view of the actual situation of the prior art, and an object of the present invention is to greatly improve the linearity between the rotational position of the rotating body (engagement portion) and the output value, and the detection accuracy. An object of the present invention is to provide a rotary variable resistor having a high value.

  In order to achieve the above object, in the rotary variable resistor of the present invention, the resistor board includes a resistor board provided with a resistor pattern and an engaging portion to which a rotational force from a rotary operation member is applied. A rotating member that is rotatable relative to the resistor pattern, and a receiving member that holds the slider in sliding contact with the resistor pattern and rotates integrally with the rotating member, the adjusting member being exposed to the outside. By providing a joint portion and rotating the receiving member with respect to the rotating body via the adjustment engaging portion, the relative position in the rotational direction of the rotating body and the receiving member can be adjusted. did.

  Thus, the rotary variable resistor in which the rotating body that is driven to rotate by engaging with a rotary operation member such as an operation knob and the receiving member that holds the slider are separate members is provided on the resistance substrate. Since only the receiving member can be rotated at the assembly stage where the positions of the sliders are aligned, the initial position of the slider with respect to the resistor pattern can be adjusted easily and accurately. That is, the relative position in the initial state of the resistor pattern and the slider is slightly shifted in the rotational operation direction due to a position shift at the time of printing the resistor pattern or a position shift at the time of attaching the slider to the receiving member. However, this misalignment can be reliably adjusted at the assembly stage. As a result, the linearity between the rotational position of the rotationally driven rotating body and the output value can be greatly improved, so that a highly accurate rotational variable resistor with very little detection error can be obtained.

  As an example, the rotary variable resistor includes an elastic member such as a spring washer interposed between the rotating body and the receiving member, and the rotating body and the receiving member are connected to one of the claws. It is preferable if the parts are connected by a snap stopper that locks the part to the other step part, and the claw part is crimped to the step part by the elastic repulsive force of the elastic member. As described above, when the rotating member and the receiving member are pressed against each other by being pressed by the elastic member, the receiving member is integrated when the rotating member is rotationally driven by the rotary operation member such as an operation knob. Can be rotated. Further, when only the receiving member is rotated in the assembly stage, the receiving member may be forcibly rotated by engaging the adjusting jig with the adjusting engaging portion while holding the rotating body in a predetermined position. Thereby, the initial position of the slider with respect to the resistor pattern can be adjusted easily and accurately.

  In this case, a non-circular first insertion hole having an engagement portion is formed in the rotating body, and a non-circular second insertion hole having an engagement portion for adjustment is formed in the receiving member. If the first insertion hole is exposed to the outside through the second insertion hole, the adjustment jig can be inserted using a part of the space into which the rotation operation member is inserted. For this reason, it is preferable that the structure can be prevented from becoming complicated and large. In addition to this, of the claw and step used when snapping the rotating body and the receiving member, the claw is provided on the rotating body and protrudes into the second insertion hole, and the step receiving member Since the rotating body and the receiving member can be easily connected in the assembling process, the rotating body and the receiving member are good even if they are separate members. Assembly workability can be expected.

  As another example, the rotary variable resistor described above is provided with a caulking projection made of synthetic resin on the receiving member and a notch into which the caulking projection can be loosely inserted on the rotating body, and the rotating body and the receiving member. After the relative position in the rotation direction is adjusted, it is preferable that the receiving member is caulked and fixed to the rotating body by crushing the caulking projection. With such a configuration, the receiving member can be kept in a state of being not restrained by the rotating body until the crimping protrusion of the receiving member is crushed. Therefore, the receiving member is smoothly rotated while the rotating body is held at a predetermined position. Therefore, the initial position of the slider with respect to the resistor pattern can be adjusted easily and accurately. In addition, after adjusting the relative positions of the rotating body and the receiving member, the caulking protrusion is crushed and the receiving member is caulked and fixed to the rotating body. Therefore, the rotating body and the receiving member are integrated with each other by a rotary operation member such as an operation knob. Can be rotated.

  In this case, if the rotating body is made of a metal plate having a plurality of notches around the engaging portion, and the rotating body is placed on the member and fixed by caulking protrusions, This is preferable because it is easy to reduce the thickness of the entire variable resistor while ensuring the mechanical strength of the engaging portion to which the rotational force is applied from the member.

  In the rotary variable resistor according to the present invention, the rotating body that is rotated by being engaged with the rotation operation member and the receiving member that holds the slider are separate members, and the rotating body is aligned with the resistance substrate. Since only the receiving member can be rotated at the assembly stage, the initial position of the slider with respect to the resistor pattern can be adjusted easily and accurately. That is, the relative position in the initial state of the resistor pattern and the slider is slightly shifted in the rotational operation direction due to a position shift at the time of printing the resistor pattern or a position shift at the time of attaching the slider to the receiving member. However, this misalignment can be reliably adjusted at the assembly stage. As a result, the linearity between the rotational position of the rotationally driven rotating body and the output value can be greatly improved, so that a highly accurate rotational variable resistor with very little detection error can be obtained.

  An embodiment of the invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view of a rotary variable resistor according to a first embodiment of the present invention, FIG. 2 is a sectional view of the variable resistor, and FIG. Is a plan view of the variable resistor, FIG. 4 is a side view of the variable resistor viewed from the direction of arrow A in FIG. 3, and FIG. 5 is a side view of the variable resistor viewed from the direction of arrow B in FIG. 6 is a bottom view of the variable resistor, FIG. 7 is a perspective view showing a state where the cover member is removed from the variable resistor, FIG. 8 is a plan view showing a state where the cover member is removed from FIG. 3, and FIG. 10 is a side view showing a state where the cover member is removed from FIG. 4, FIG. 10 is a side view showing a state where the cover member is removed from FIG. 5, and FIG. 11 is a bottom view showing a state where the cover member is removed from FIG.

  The rotary variable resistor shown in these drawings is provided with a resistance substrate 1 provided with a resistor pattern 2 and the like, a rotating body 3 having an engaging portion 3a and being driven to rotate, and a slider 4. The receiving member 5, the spring washer 6 that presses a part of the receiving member 5 to the rotating body 3, the mounting plate 7 disposed on the bottom surface side of the resistance substrate 1, and the receiving member 5 are disposed. The cover member 8 that presses the mounting plate 7 against the resistance substrate 1 and the annular frame 9 that is placed on the resistance substrate 1 and surrounds the slider 4 and the receiving member 5 are mainly configured. Yes.

  A circular through hole 1a is formed in the resistance substrate 1, and a horseshoe-shaped resistor pattern 2 and an annular current collector pattern 10 are provided concentrically around the through hole 1a. . Three terminals 11 are disposed at one end of the resistor substrate 1, of which two terminals 11 are connected to both ends of the resistor pattern 2, and the remaining one terminal 11 is a current collector pattern. 10 is connected.

  The rotator 3 is a resin molded product having a first insertion hole 3b in the center. The rotator 3 includes a cylindrical shaft portion 3c having engaging portions 3a formed on opposing inner wall portions, and a cylinder. An annular groove 3d formed around the shaft 3c and a pair of claw pieces 3e projecting upward are provided. The first insertion hole 3b is defined as a non-circular space by the presence of the engaging portion 3a, and a drive shaft 30 (see FIG. 2) of a rotary operation member such as an operation knob is formed in the first insertion hole 3b. It is supposed to be inserted. And when this drive shaft 30 engages with the engaging part 3a, the rotational force of a rotation operation member is given to the rotary body 3 via the engaging part 3a. The lower end portion of the cylindrical shaft portion 3c is fitted into the cylindrical portion 7a of the mounting plate 7 in the through hole 1a of the resistance substrate 1, and the inner peripheral surface of this cylindrical portion 7a becomes the bearing surface of the cylindrical shaft portion 3c. ing. A spring washer 6 is housed in the annular groove 3d, and the pair of claw pieces 3e are snapped to a step 5a of a receiving member 5 described later.

  The receiving member 5 is a disk-shaped resin molded product having a second insertion hole 5b at the center, and an adjustment recess 5c and a stepped portion 5a are formed on the inner wall portion protruding from the second insertion hole 5b. Is provided. A pair of adjustment recesses 5c are provided at opposite positions as recesses for engaging the jig when the position of the receiving member 5 is adjusted. Since these adjustment recesses 5c exist, the second insertion hole 5b is non-circular. It is defined as a unique space. A pair of stepped portions 5a are also provided at opposite locations, and the claw pieces 3e of the rotating body 3 are snapped to each stepped portion 5a as described above. Since the inner peripheral portion of the receiving member 5 is elastically biased upward by the spring washer 6, the stepped portion 5a is pressure-bonded to the claw piece 3e by the elastic repulsive force of the spring washer 6, as shown in FIG. It is like that. Therefore, when the rotating body 3 is rotated by the drive shaft 30 of the rotation operation member, the receiving member 5 rotates integrally with the rotating body 3. The slider 4 is attached to a plurality of locations on the bottom surface of the receiving member 5 by fixing means such as caulking. The slider 4 includes a contact piece 4 a that is in sliding contact with the resistor pattern 2, and a current collector pattern 10. And a contact piece 4b that is slidably contacted.

  The mounting plate 7 is made of a metal plate, and leg pieces 7b are bent at a plurality of locations on the peripheral edge thereof. These leg pieces 7b are parts that are mechanically connected to a wiring board (not shown) by soldering or bonding. The mounting plate 7 has a cylindrical portion 7a inserted into the through hole 1a of the resistance substrate 1 by burring. As described above, the inner peripheral surface of the cylindrical portion 7a is the rotating body 3 (cylindrical shaft portion). 3c) is a bearing surface.

  The cover member 8 is made of a metal plate, and a circular through hole 8b is formed in the top plate portion 8a. A plurality of holding pieces 8c are bent downward from the periphery of the top plate portion 8a. The holding plate 7 is pressure-bonded to the bottom surface of the resistance substrate 1 by these holding pieces 8c, and an annular frame. 9 is sandwiched between the resistance substrate 1 and the top plate portion 8a. By assembling the cover member 8 in this way, the rotating body 3 and the receiving member 5 are prevented from tilting or falling off, and as shown in FIG. 3, the engaging portion 3 a and the adjustment concave portion 5 c are formed via the through hole 8 b of the cover member 8. It is exposed to the outside.

  In the rotary variable resistor configured as described above, in the final stage of the assembly process, the rotating member 3 is appropriately rotated through the adjusting recess 5c while holding the rotating member 3 in a predetermined position. The relative position of the receiving member 5 in the rotation direction can be adjusted. That is, a slight shift is likely to occur in the initial position of the slider 4 with respect to the resistor pattern 2 due to a position shift during printing of the resistor pattern 2 or a position shift when the slider 4 is attached to the receiving member 5. However, if the receiving member 5 can be forcibly rotated with respect to the rotating body 3, the initial position of the slider 4 with respect to the resistor pattern 2 can be adjusted. At that time, the rotating body 3 is positioned with respect to the resistance substrate 1 so that the direction of the engaging portion 3a is not shifted, and in this state, a jig is engaged with the engaging portion 3a, for example. Stop it. Then, the adjustment jig 40 (see FIG. 3) inserted into the second insertion hole 5b is engaged with the adjustment concave portion 5c, and the receiving member 5 is forced with a strong force exceeding the crimping force generated by the spring washer 6. Since the receiving member 5 is displaced in the rotational direction with respect to the rotating body 3 when the rotation is performed, the initial position of the slider 4 with respect to the resistor pattern 2 is kept high with the engagement portion 3a kept at a desired position. Can be set.

  After the assembly and adjustment of the rotary variable resistor is completed, the terminal 11 is mounted on a wiring board (not shown) having a solderable land, and then is non-circular in the first insertion hole 3b of the rotary body 3. By inserting the drive shaft 30 and engaging the drive shaft 30 with the engaging portion 3a, the drive shaft 30 is connected to a rotation operation member such as an operation knob. Therefore, as the rotating body 3 is driven to rotate by the drive shaft 30, the receiving member 5 rotates integrally, and the slider 4 slides relative to the resistor pattern 2 and the current collector pattern 10. The output resistance value changes, and the electrical signal is output to an external circuit via the terminal 11.

  As described above, in the rotary variable resistor according to this embodiment, the rotating body 3 that is rotated by being engaged with the drive shaft 30 of the rotation operation member and the receiving member 5 that holds the slider 4 are separated. The rotating body 3 and the receiving member 5 are pressure-bonded by an elastic repulsion force of a spring washer 6 that is an elastic member. Therefore, the relative position of the receiving member 5 with respect to the rotating body 3 can be adjusted by appropriately rotating only the receiving member 5 in a state in which the rotating body 3 is aligned with the resistance substrate 1, and therefore the resistor pattern 2. The initial position of the slider 4 with respect to can be adjusted. In addition, the adjustment work is performed by forcibly rotating the receiving member 5 by engaging the adjustment jig 40 with the adjustment concave portion 5c which is the adjustment engagement portion while holding the rotating body 3 in a desired position. Therefore, it can be performed easily and accurately. Therefore, it is easy to improve the accuracy by greatly improving the linearity between the rotational position and the output value of the rotating body 3 (engagement portion 3a) driven to rotate by the rotation operation member (drive shaft 30), and the detection error is extremely small. Fewer rotary variable resistors can be obtained.

  Further, in this rotary variable resistor, the engaging portion 3a in the first insertion hole 3b and the adjustment concave portion 5c in the second insertion hole 5b are exposed to the outside through the through hole 8b of the cover member 8. It is comprised so that it may do. That is, since the adjustment jig 40 can be inserted using a part of the space in which the drive shaft 30 of the rotation operation member is inserted, the complexity and size of the structure are suppressed. Further, in this rotary variable resistor, the rotating body 3 is provided with a claw piece 3e that protrudes into the second insertion hole 5b, and the receiving member 5 is provided with a step portion 5a that protrudes into the second insertion hole 5b. Since the claw piece 3e is snapped to the step portion 5a, the rotating body 3 and the receiving member 5 can be easily connected in the assembly process. Therefore, good assembly workability can be expected even if the rotating body 3 and the receiving member 5 are separate members.

  FIG. 12 is a plan view of a rotary variable resistor according to a second embodiment of the present invention, and FIG. 13 is a sectional view of the variable resistor.

  The rotary variable resistors shown in these drawings are provided with a resistor board 21 provided with a relay terminal 22 and a resistor pattern (not shown) and a terminal 24, and the resistor board 21 is mounted and fixed. A base member 23, a resin molded product to which a slider 25 is attached, a receiving member 26 pivotally supported by the base member 23, and a metal plate that has an engagement hole 27a and is fixed by caulking on the receiving member 26 And the rotating body 27.

  A circular through hole 21a is formed in the resistance substrate 21, and a resistor pattern and a current collector pattern (not shown) are provided concentrically around the through hole 21a. The relay terminal 22 is connected to the resistor pattern and the current collector pattern, and is connected to the terminal 24 on the base member 23. The base member 23 is provided with a plurality of mounting holes 23a. The base member 23 is mounted on a wiring board (not shown) using the mounting holes 23a as positioning portions, and the terminals 24 are soldered to the lands of the wiring board. It has become so. The base member 23 is provided with a cylindrical bearing portion 23b protruding from the through hole 21a of the resistance substrate 21 and protruding upward. Since the cylindrical shaft portion 26a of the receiving member 26 is slidably inserted into the bearing portion 23b, the inner peripheral surface of the bearing portion 23b is a bearing surface of the receiving member 26 (cylindrical shaft portion 26a). .

  The receiving member 26 is provided with a disk-shaped flange portion 26b protruding outward from the upper end portion of the cylindrical shaft portion 26a. A slider 25 attached to the bottom surface of the flange portion 26b is provided on the resistance substrate 21. It is in sliding contact with the resistor pattern and the current collector pattern. The upper surface of the flange portion 26b of the receiving member 26 is a flat surface on which the rotating body 27 is placed, and an adjustment projection 26c and two types of caulking projections 26d and 26e (shown after the crushing) on the outer periphery of the flat surface. Are shown in a distributed manner. The adjustment protrusion 26c is for engaging with an adjustment jig (not shown) when adjusting the relative position of the receiving member 26 with respect to the rotating body 27, and is arranged with an interval of 180 degrees in this embodiment. The two adjustment protrusions 26c are provided. The caulking protrusions 26d and 26e are crushed after the relative position of the receiving member 26 is adjusted and are caulked and fixed to the receiving member 26. In this embodiment, the caulking protrusions 26d and 26e are arranged with an interval of 180 degrees. There are two caulking protrusions 26d and four caulking protrusions 26e arranged at an interval of 90 degrees. An oblong engagement hole 27a is formed in the center of the rotating body 27, and a drive shaft (not shown) of a rotation operation member such as an operation knob is inserted into the engagement hole 27a. ing. The rotating body 27 has a plurality of clearance holes 27b into which the adjustment protrusions 26c are loosely inserted, a notch 27c into which the caulking protrusions 26d before crushing are loosely inserted, and caulking before crushing. A notch 27d into which the protrusion 26e is loosely inserted is provided.

  That is, in this rotary variable resistor, the receiving member 26 is not restrained by the rotating body 27 until the caulking protrusions 26d and 26e are crushed, and after adjusting the relative position of the receiving member 26 in the rotating direction with respect to the rotating body 27. The receiving member 26 can be caulked and fixed to the rotating body 27 by crushing the caulking projections 26d and 26e. The shape and size of the relief hole 27b and the notches 27c and 27d are designed so that the movement of the adjustment projection 26c and the caulking projections 26d and 26e before crushing is not restricted when the relative position of the receiving member 26 is adjusted. Designed. Further, when the two caulking projections 26d are crushed, the peripheral edge portion of the corresponding notch 27c is pressed against the flange portion 26b, so that the rotating body 27 can be prevented from floating. Furthermore, since the four caulking projections 26e are crushed and engaged with the peripheral portions of the corresponding notches 27d, the movement of the rotating body 27 in the in-plane direction can be prevented.

  In the rotary variable resistor configured in this way, at the final stage of the assembly process, the receiving member 26 is appropriately rotated through the adjustment protrusion 26c while the rotating body 27 is held at a predetermined position, thereby rotating the rotating body 27. The relative position of the receiving member 26 in the rotation direction can be adjusted. At that time, the rotating body 27 is positioned with respect to the resistance substrate 21 so that the direction of the engaging hole 27a is not shifted, and in this state, a jig is engaged with the engaging hole 27a to prevent rotation. Keep it. Then, by engaging the adjustment protrusion 26c with the adjustment jig and appropriately rotating the receiving member 26, the positional deviation of the receiving member 26 in the rotation direction with respect to the rotating body 27 can be adjusted. The initial position of the slider 25 with respect to the resistor pattern on the resistor substrate 21 can be set with high accuracy while maintaining 27a at a desired position.

  The rotary variable resistor thus assembled and adjusted is mounted on a wiring board (not shown) provided with a land to which the terminal 24 can be soldered, and then rotated by an operation knob or the like in the engagement hole 27a of the rotary body 27. By inserting and engaging the drive shaft of the operation member, it is connected to the rotation operation member. Therefore, as the rotating body 27 is driven to rotate by the rotation operation member, the receiving member 26 rotates integrally, and the slider 25 slides against the resistor pattern and the current collector pattern on the resistor substrate 21. Therefore, the output resistance value changes, and the electric signal is output to the external circuit via the terminal 24.

  As described above, in the rotary variable resistor according to the present embodiment, the receiving member 26 that holds the slider 25 and the non-circular (oval-shaped) drive shaft of the rotary operation member are engaged and driven to rotate. The rotating body 27 is a separate member, and the receiving member 26 is caulked and fixed to the rotating body 27 by crushing the caulking projections 26d and 26e after adjusting the relative position of the receiving member 26 with respect to the rotating body 27. It has become. In other words, since the receiving member 26 is not restrained by the rotating body 27 until the caulking projections 26d and 26e are crushed, the receiving member 26 can be smoothly rotated while the rotating body 27 is held at a predetermined position. The initial position of the slider 25 with respect to the resistor pattern on the resistor substrate 21 can be adjusted easily and accurately. Further, such adjustment work can be performed easily and accurately because the receiving member 26 may be rotated by the adjustment jig through the adjustment protrusion 26c while the rotating body 27 is held at a desired position. Therefore, it is easy to achieve high accuracy by greatly improving the linearity between the rotational position of the rotating body 27 (engagement hole 27a) and the output value that are rotationally driven by the rotation operation member (drive shaft), and detection errors are extremely small. A rotary variable resistor is obtained.

  Further, in this rotary variable resistor, a metal plate having escape holes 27b and notches 27c and 27d around an engagement hole 27a as an engagement portion is used as the rotating body 27. Since it is configured to be mounted on the upper surface and fixed by a plurality of caulking protrusions 26d and 26e, the entire variable resistor is secured while ensuring the mechanical strength of the engagement hole 27a to which the rotational force is applied from the rotation operation member. It is easy to reduce the thickness. Further, after adjusting the relative position of the receiving member 26 with respect to the rotating body 27 by engaging the adjustment protrusion 26c, which is the adjustment engagement portion, with the adjustment jig, the engagement state of the adjustment protrusion 26c is maintained. Since the crushing work of the caulking projections 26d and 26e can be performed, the assembling workability is also good.

1 is an exploded perspective view of a rotary variable resistor according to a first embodiment of the present invention. It is sectional drawing of this variable resistor. It is a top view of this variable resistor. It is the side view which looked at this variable resistor from the arrow A direction of FIG. It is the side view which looked at this variable resistor from the arrow B direction of FIG. It is a bottom view of the variable resistor. It is a perspective view which shows the state which removed the cover member from this variable resistor. It is a top view which shows the state which removed the cover member from FIG. It is a side view which shows the state which removed the cover member from FIG. It is a side view which shows the state which removed the cover member from FIG. It is a bottom view which shows the state which removed the cover member from FIG. It is a top view of the rotation type variable resistor which concerns on the example of 2nd Embodiment of this invention. It is sectional drawing of the variable resistor shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,21 Resistance board 2 Resistor pattern 3,27 Rotating body 3a Engagement part 3b 1st insertion hole 3e Claw piece (claw part)
4,25 Slider 5,26 Receiving member 5a Step portion 5b Second insertion hole 5c Adjustment concave portion (adjustment engagement portion)
6 Spring washer (elastic member)
7 Mounting plate 7a Cylindrical portion 8 Cover member 11, 24 Terminal 22 Relay terminal 23 Base member 23b Bearing portion 26c Adjustment protrusion (Adjustment engagement portion)
26d, 26e Caulking projection 27a Engagement hole (engagement part)
27b Escape hole 27c, 27d Notch 30 Drive shaft (of rotation operation member) 40 Adjustment jig

Claims (6)

A resistance board provided with a resistor pattern, a rotating body having an engaging portion to which a rotational force from a rotation operation member is applied, a rotatable body rotatable with respect to the resistance board, and a sliding sliding contact with the resistor pattern A receiving member that holds the child and rotates integrally with the rotating body,
The receiving member is provided with an adjusting engagement portion exposed to the outside, and the rotating member and the receiving member are rotated by rotating the receiving member with respect to the rotating body via the adjusting engaging portion. A rotary variable resistor characterized in that the relative position in the direction can be adjusted.   2. The elastic member according to claim 1, further comprising an elastic member interposed between the rotating body and the receiving member, wherein the claw portion on one side of the rotating body and the receiving member is connected to the step on the other side. A rotary variable resistor characterized in that the claw portion is crimped to the stepped portion by an elastic repulsive force of the elastic member.   The non-circular second insertion hole according to claim 2, wherein a non-circular first insertion hole having the engaging portion is formed in the rotating body, and the receiving member has the adjusting engaging portion. The rotary variable resistor is characterized in that an insertion hole is formed and the first insertion hole is exposed to the outside through the second insertion hole.   In Claim 3, The said nail | claw part was provided in the said rotary body, and it protruded in the said 2nd insertion hole, and the said step part was provided in the said receiving member, and it protruded to the said 2nd insertion hole. A rotary variable resistor characterized by that.   In Claim 1, While providing the crimping protrusion made from a synthetic resin in the said receiving member, the notch which can loosely insert the said crimping protrusion in the said rotary body is provided, and the rotation direction of the said rotary body and the said receiving member is provided. The rotary variable resistor according to claim 1, wherein after the relative position is adjusted, the receiving member is caulked and fixed to the rotating body by crushing the caulking protrusion.   6. The rotating body according to claim 5, wherein the rotating body is made of a metal plate having a plurality of the notches around the engaging portion, and the rotating body is placed on the receiving member and fixed by the caulking protrusion. A rotary variable resistor characterized by the above.

Images