JP2008108911A - Rotary variable resistor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary variable resistor which can remarkably improve the linearity between the rotating position of a rotary body and the output value, has a high detection accuracy, and has a versatility which makes it easily applicable to various wiring boards. <P>SOLUTION: The rotary variable resistor is so structured that the main body 1 thereof may be mounted on a wiring board via a base 2. After mounting the main body 1 on the base 2, the rotary body 6 for holding a slider 7 is aligned and then a resistor substrate 3 is rotated with respect to the base 2 to adjust the initial position of the slider 7 with respect to a resistor pattern 4. The thus position-adjusted resistor substrate 3 is fixed to the base 2 by, for example, an engagement piece 8b of an installation board 8 which is an integral part of the resistor substrate 3. In this rotary variable resistor, a driving shaft 20 of a rotation operating member is engaged with an engagement portion 6a of the rotary body 6, and the rotary body 6 is rotate-driven by the driving shaft 20. <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 value of the slider. The present invention relates to a rotary variable resistor having good linearity and capable of highly accurate detection.

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 hole) 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. In other words, in order to accurately detect the rotational position of the slider receiver from the output value, it is assumed that the relative position of the resistor pattern and the slider and the slider receiver are not shifted in the rotational operation direction in the initial state. However, since it is difficult to perform printing and assembly so that such misregistration does not occur at all, it is necessary to allow for some detection error in the conventional rotary variable resistor in advance, so that high accuracy is achieved. There was a limit.

  Further, the conventional rotary variable resistor can be mounted only on a wiring board having a land on which a terminal provided on the resistance board can be soldered, and another wiring board having a different land arrangement and shape. When this is applied, another rotary variable resistor having the same structure of the main body but different only in terminal arrangement and shape has to be manufactured. However, in order to cope with the variety of wiring boards, it is inefficient to manufacture a plurality of types of rotary variable resistors that are different in operation and performance and differ only in a part of the configuration. The disadvantage was great.

  The present invention has been made in view of such a state of the art, and the purpose thereof is to greatly improve the linearity between the rotational position of the rotating body and the output value, and the detection accuracy is high, An object of the present invention is to provide a rotary variable resistor having versatility that can be easily applied to various wiring boards.

  In order to achieve the above object, in the rotary variable resistor according to the present invention, a resistor board provided with a resistor pattern and a first terminal connected to the resistor pattern is engaged with a rotary operation member. A rotating body that has an engaging portion to which a rotational force is applied and is rotatable with respect to the resistance substrate; a slider that slides in contact with the resistor pattern and rotates integrally with the rotating body; The resistance board mounted on the base, comprising: a base provided with a second terminal connected to the terminal and mounting the resistance board; and board fixing means for fixing the resistance board to the base. The position of the first terminal can be adjusted along the direction of rotation until it is fixed to the base, and the first terminal is kept in contact with the second terminal during the position adjustment.

  The rotary variable resistor having the structure in which the resistance substrate provided with the first terminal is mounted on the base provided with the second terminal that is electrically connected to the first terminal has the main body portion of the base. The second terminal is soldered to the land of the wiring board. Therefore, the rotating body is aligned with the base, and the resistance board is appropriately rotated with respect to the base at the assembly stage where the resistance board is not fixed to the base to change the relative position with the slider. As a result, the initial position of the slider with respect to the resistor pattern can be adjusted easily and accurately. Further, since the first terminal maintains contact with the second terminal during the position adjustment, there is no possibility that the electrical connection with the wiring board will be hindered. In other words, the relative position of the resistor pattern and the slider in the initial state is slightly shifted in the rotational operation direction due to a position shift during printing of the resistor pattern or a position shift when the slider is integrated with the rotor. However, since this positional deviation can be adjusted reliably at the assembly stage, the linearity between the rotational position and output value of the rotating body with an integrated slider is greatly improved. It becomes easy. In addition, this rotary variable resistor can be applied to multiple types of wiring boards with different land layouts and shapes just by changing the base, so it can be used at low cost without any changes to the main body. Can be increased.

  In the above configuration, the board fixing means is a metal plate mounting plate integrated with the resistance board, and the resistance board is fixed to the base board by locking a plurality of locking pieces provided on the mounting board to the base. If fixed to the base, the work of fixing the resistance substrate whose position has been adjusted along the direction of rotation can be easily performed. In this case, the mounting plate has a cylindrical portion that is inserted into the through hole of the resistance substrate and protrudes by burring, and the inner peripheral surface of the cylindrical portion is used as a bearing surface of the rotating body. This is preferable because the rotating body can be always rotated smoothly and the product life is extended.

  In the rotary variable resistor according to the present invention, a resistance board provided with a first terminal is mounted on a base provided with a second terminal that is electrically connected to the first terminal, and the wiring board is provided via the base. Since the rotating body is positioned with respect to the base and the resistance board is not fixed to the base, the resistance board is appropriately rotated with respect to the base and slid. By changing the relative position to the moving element, the initial position of the slider with respect to the resistor pattern can be adjusted easily and accurately. Further, since the first terminal maintains contact with the second terminal during the position adjustment, there is no possibility that the electrical connection with the wiring board will be hindered. In other words, the relative position of the resistor pattern and the slider in the initial state is slightly shifted in the rotational operation direction due to a position shift during printing of the resistor pattern or a position shift when the slider is integrated with the rotor. However, this positional deviation can be reliably adjusted at the assembly stage, so that the linearity between the rotational position of the rotating body integrated with the slider and the output value can be improved, and the detection accuracy can be greatly increased. it can. In addition, this rotary variable resistor can be applied to multiple types of wiring boards with different land layouts and shapes just by changing the base, so it can be used at low cost without any changes to the main body. Can be increased.

  BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a rotary variable resistor according to a first embodiment of the present invention, and FIG. 2 is a sectional view taken along line II-II in FIG. 3 is a side view of the main body portion of the variable resistor, and FIG. 4 is a bottom view of the main body portion.

  The rotary variable resistors shown in these drawings are obtained by mounting a main body part 1 on a base 2 and electrically and mechanically connecting the main body part 1 via the base 2 (not shown). To be implemented). The main body 1 is composed of a resistance substrate 3 provided with a resistor pattern 4 and first terminals 5, a synthetic resin rotator 6 rotatable with respect to the resistor substrate 3, and an elastic metal plate. A slider 7 that is attached to 6 and slidably contacts the resistor pattern 4 and the like, and a metal plate mounting plate 8 that has a cylindrical portion 8 a that pivotally supports the rotating body 6 and is crimped to the bottom surface of the resistor substrate 3. The cover member 9 is mainly composed of a metal plate cover member 9 disposed so as to cover the rotating body 6 and holding the resistance substrate 3 and the mounting plate 8. On the other hand, the base 2 is provided with a plurality of second terminals 10 made of a metal plate connected to the first terminals 5 so that the second terminals 10 are soldered to the lands of the wiring board. It has become. The base 2 is formed with a plurality of escape holes 2a around a region where the main body portion 1 is mounted.

  A circular through hole 3a is formed in the resistance substrate 3. As shown in FIG. 1, a horseshoe-shaped resistor pattern 4 and an annular current collector are formed on the upper surface of the resistance substrate 3 around the through hole 3a. The body pattern 11 is provided concentrically. In addition, three first terminals 5 made of a metal plate are caulked and fixed to one end of the resistance substrate 3, and two of the first terminals 5 are connected to both ends of the resistor pattern 4 and the rest. One first terminal 5 is connected to the current collector pattern 11.

  The rotating body 6 includes a cylindrical shaft portion 6b having an engaging portion 6a on an inner wall portion, and a flange portion 6c protruding outward from the cylindrical shaft portion 6b. The upper end portion of the cylindrical shaft portion 6b is a cover member 9. It is inserted into the through hole in the center of the. The inner space surrounded by the cylindrical shaft portion 6b is non-circular at the portion where the engaging portion 6a exists, and the drive shaft 20 (see FIG. 2) of the rotary operation member including an operation knob or the like in this non-circular space. ) Is inserted to engage with the engaging portion 6a. Thereby, a rotational force is applied to the engaging portion 6a from the rotation operation member, and the rotating body 6 is rotationally driven. The lower end portion of the cylindrical shaft portion 6b is fitted into the cylindrical portion 8a of the mounting plate 8 in the through hole 3a of the resistance substrate 3, and the inner peripheral surface of the cylindrical portion 8a is a bearing surface of the cylindrical shaft portion 6b. It has become. The slider 7 is attached to the bottom surface of the flange portion 6c of the rotating body 6 by using a fixing means such as caulking. The slider 7 is in sliding contact with the resistor pattern 4 as shown in FIG. A contact piece 7 a and a contact piece 7 b that is in sliding contact with the current collector pattern 11 are provided.

  Locking pieces 8b protrude from the mounting plate 8 at a plurality of locations. These locking pieces 8b are locked to the base 2 by being inserted into the escape holes 2a of the base 2 and turned back. The locking operation of the locking pieces 8b is performed on the resistance board 3 with respect to the base 2. This is done after the position adjustment is completed. Further, the mounting plate 8 is provided with a cylindrical portion 8a that is inserted into the through hole 3a of the resistance substrate 3 by burring, and as described above, the inner peripheral surface of the cylindrical portion 8a is the rotating body 6 (cylindrical). The shaft surface 6b) is a bearing surface.

  The cover member 9 is formed with a side wall portion 9 a that is placed on the resistance substrate 3 and a holding piece 9 b that presses the attachment plate 8 against the bottom surface of the resistance substrate 3. The resistance board 3 and the mounting plate 8 are held together by the cover member 9, and the rotating body 6 is prevented from tilting or falling off. That is, the main body portion 1 can be handled as a unit product by assembling the cover member 9.

  The base 2 is formed in a plate shape that is slightly larger than the main body part 1, and three second terminals corresponding to the three first terminals 5 of the main body part 1 are formed at one end of the base 2. 10 is fixed by caulking. One end 10a of the second terminal 10 is formed in a three-pronged shape capable of elastically holding the first terminal 5. In addition, although the other end part of the 2nd terminal 10 is illustrated in linear form, this other end part is bend | folded suitably in a shape (for example, crank shape) before mounting. The base 2 is provided with relief holes 2a at a plurality of locations. The retaining pieces 8b of the mounting plate 8 are inserted into the relief holes 2a, respectively, and the first terminals 5 correspond to the second terminals 10 corresponding thereto. The main body portion 1 is mounted on the base 2 in a state where the main body portion 1 is press-fitted into the one end portion 10a. Then, the engaging portion 6a of the rotating body 6 is aligned with the base 2 and stopped with a jig or the like, and then the resistance substrate 3 (main body portion 1) is appropriately rotated with respect to the base 2 to slide. By changing the relative position with respect to the child 7, the initial position of the slider 7 with respect to the resistor pattern 4 is adjusted. After that, the main body part 1 including the resistance substrate 3 whose position is adjusted is fixed to the base 2 by bending each locking piece 8b of the mounting plate 8 into an L-shape and locking it at an appropriate position of the base 2. This completes the assembly of the rotary variable resistor. The base 2 is provided with a plurality of mounting holes 2b, and the base 2 is mounted on a wiring board (not shown) using the mounting holes 2b as positioning portions.

  That is, in this rotary variable resistor, after the main body portion 1 is mounted on the base 2, the position of the resistance board 3 is adjusted along the rotational operation direction, and then the mounting plate 8 is locked to the base 2. Assembled in. Therefore, the relative position in the initial state of the resistor pattern 4 and the slider 7 is rotated by the positional deviation at the time of printing of the resistor pattern 4 or the positional deviation when the slider 7 is attached to the rotating body 6. Even if there is a slight deviation in the direction, the positional deviation can be reliably adjusted at the assembly stage. Even if the resistance board 3 is rotated a little on the base 2 in this way, the one end portion 10a of the second terminal 10, that is, the contact piece divided into a plurality (three in this embodiment) is elastically applied. Since the sandwiched first terminal 5 maintains contact with the second terminal 10 on one surface and the other surface, there is no possibility that each first terminal 5 will interfere with the electrical connection with the wiring board after mounting. . Further, when the position is adjusted, the mounting plate 8 also rotates integrally with the resistance board 3 with respect to the base 2, but as shown in FIG. 1, the escape hole 2 a is slightly moved by the locking piece 8 b in the rotational operation direction. Since it is formed in a size that can be made, there is no possibility that the locking piece 8b and the base 2 interfere with each other and the adjustment work is hindered.

  After the assembly, the rotary variable resistor is mounted on a wiring board (not shown) having a land on which each second terminal 10 can be soldered, and then into the cylindrical shaft portion 6b of the rotating body 6. A drive shaft 20 of a rotary operation member such as an operation knob is inserted, and the drive shaft 20 engages with the engaging portion 6a. Therefore, as the rotating body 6 is rotationally driven by the drive shaft 20, the slider 7 slides with respect to the resistor pattern 4 and the current collector pattern 11, and the output resistance value changes. Is output to an external circuit via the first and second terminals 5 and 10.

  As described above, the rotary variable resistor according to the present embodiment is provided with the second terminal 10 that is electrically connected to the first terminal 5 through the resistor substrate 3 (main body portion 1) provided with the first terminal 5. Since the structure is mounted on the base 2 and mounted on the wiring board via the base 2, the rotating body 6 is aligned with the base 2, and the resistance board 3 is mounted on the base 2. At the assembly stage not fixed to the slider 7, the resistance substrate 3 (main body portion 1) is appropriately rotated with respect to the base 2 to change the relative position with respect to the slider 7, whereby the slider 7 with respect to the resistor pattern 4 is changed. The initial position can be easily and accurately adjusted. Also, consideration is given so that contact between the first terminal 5 and the second terminal 10 is not impaired during the position adjustment. Therefore, this rotary variable resistor can be easily improved in accuracy by greatly improving the linearity between the rotational position of the rotating body 6 (engagement portion 6a) attached with the slider 7 with respect to the base 2 and the output value. If it is used as a feedback sensor or the like that requires high detection accuracy, a remarkable practical effect can be expected.

  In addition, the rotary variable resistor according to the present embodiment can be applied to a plurality of types of wiring boards having different land arrangements and shapes by simply changing the base 2, so that versatility is improved at a low cost. be able to. That is, since this rotary variable resistor can be adapted to the variety of wiring boards without any changes to the main body portion 1, the total cost can be reduced.

  In this embodiment, the resistance board 3 after position adjustment is fixed to the base 2 by locking the plurality of locking pieces 8 b provided on the metal plate mounting plate 8 to the base 2. Since the fixing is performed, the work of fixing the resistance substrate 3 to the base 2 can be easily performed. However, the resistance substrate 3 after position adjustment may be firmly fixed to the base 2 by filling the escape hole 2a with an adhesive or the like.

  Further, as in the present embodiment example, the cylindrical portion 8 a is projected from the mounting plate 8 by burring, and the inner peripheral surface of the cylindrical portion 8 a is used as the bearing surface of the rotating body 6. It is preferable because the rotating body 6 can be always rotated smoothly and the product life is extended.

  FIG. 5 is a cross-sectional view of the rotary variable resistor according to the second embodiment of the present invention. The same reference numerals are given to the portions corresponding to those in FIG.

  The rotary variable resistor shown in FIG. 5 is different from the first embodiment in the shape of the locking piece 8b of the mounting plate 8, and the other configurations are the same. That is, the distal end portion of the locking piece 8b is formed in a wedge shape, and the resistor substrate 3 after position adjustment can be firmly fixed to the base 2 by biting the wedge-shaped distal end portion into the base 2. It has become. Also in this case, the fixing strength may be further increased by filling the escape hole 2a with an adhesive.

  In each embodiment described above, the resistance board 3 after position adjustment is fixed to the base 2 by the locking piece 8b of the mounting plate 8, but the present invention is not limited to this, For example, the resistance substrate 3 may be caulked and fixed to the base 2 at the extended portion of the cover member 9. Moreover, the structure for maintaining the contact between the first terminal 5 and the second terminal 10 can also be appropriately selected. For example, the first terminal 5 is formed on the resistance substrate 3 by an electrode pattern, and the second terminal is formed on the electrode pattern. You may make it make the one end part of 10 elastically contact.

1 is a plan view of a rotary variable resistor according to a first embodiment of the present invention. It is sectional drawing which follows the II-II line of FIG. It is a side view of the main-body part of this variable resistor. It is a bottom view of this main-body part. It is sectional drawing of the rotary type variable resistor which concerns on the 2nd Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main-body part 2 Base 2a Escape hole 3 Resistance board 3a Through-hole 4 Resistor pattern 5 1st terminal 6 Rotating body 6a Engagement part 6b Cylindrical shaft part 7 Slider 8 Mounting board (board fixing means)
8a Cylindrical portion 8b Locking piece 9 Cover member 9b Holding piece 10 Second terminal 20 Drive shaft (of the rotation operation member)

Claims (3)

A resistor board provided with a resistor pattern and a first terminal connected to the resistor pattern, and an engaging portion to which a rotational force is applied by being engaged with a rotation operation member, and rotating with respect to the resistor board The resistance substrate is mounted by providing a possible rotating body, a slider that slides in contact with the resistor pattern and rotates integrally with the rotating body, and a second terminal electrically connected to the first terminal. A base and board fixing means for fixing the resistance board to the base;
The position of the resistance board mounted on the base can be adjusted along the rotational operation direction until the resistance board is fixed to the base, and the first terminal is in contact with the second terminal during the position adjustment. A rotary variable resistor characterized by being configured to maintain.   2. The metal plate mounting plate according to claim 1, wherein the board fixing means is integrated with the resistance board, and a plurality of locking pieces provided on the mounting board are locked to the base. The rotary variable resistor is characterized in that the resistance substrate is fixed to the base by the above.   The cylindrical portion inserted into the through hole of the resistance board is projected from the mounting plate by burring, and the inner peripheral surface of the cylindrical portion serves as a bearing surface of the rotating body. A rotary variable resistor characterized by that.

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