JP2005150275A - Rotating operation type variable resistor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive rotation operation-type variable resistor whose operation angle range used for temperature control of an onboard air conditioner is smaller than 360° and whose position precision is high. <P>SOLUTION: A resistance element 18 in an almost annular shape on a resistor substrate 11 is composed of a first conduction part 16 and a second conduction part 17, which are connected to a circular resistance coat 15 and both ends of the coat. An annular first collector 19 is formed on an inner circumference side and a second collector 20 in the almost annular shape on an outer circumference side. A first slider 13 fixed to the lower face of the flange 12B of an operation object 12 slides on the resistance coat 15 and the first collector 19, and a second slider 14 fixed to the lower face of the flange 12B of the operation object 12 slides on the resistance coat 15 and the second collector 20 in accordance with a right rotary operation of the operation object 12. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a rotary operation type variable resistor used for controlling various electronic devices such as temperature adjustment of an in-vehicle air conditioner.

  In recent years, rotational operation type variable resistors are increasingly used for temperature control of in-vehicle air conditioners, etc., and the range of operation is less than 360 degrees and the temperature can be set in small increments as equipment becomes more functional and sophisticated. High accuracy is demanded.

  Such a conventional rotary operation type variable resistor will be described with reference to FIGS.

  FIG. 7 is an exploded perspective view of a conventional rotary operation type variable resistor, and FIG. 8 is a diagram showing the relationship between the printed pattern of the resistor substrate, which is the main part, and the slider.

  In FIG. 7, reference numeral 1 denotes a substantially circular insulating resin made of a cylindrical portion 1 </ b> B projecting upward around a central circular hole 1 </ b> A and having an outer peripheral region portion formed from the cylindrical portion 1 </ b> B as a recess 1 </ b> C. The case 2 is a substantially annular resistor substrate placed on the bottom surface of the recess 1C of the case 1.

  Reference numeral 3 denotes an operating body in which the inner surface of the cylindrical operating shaft 3A is rotatably fitted to the outer surface of the cylindrical portion 1B of the case 1, and a flange portion 3B provided below the operating body is a concave portion of the case 1. The upper portion of the recess 1C is covered with a cover 4 attached to the case 1.

  A step 3C arranged to restrict the rotation angle of the operation body 3 is disposed on the upper surface of the flange portion 3B of the operation body 3, and the side surface of the step 3C corresponds to the cover. An operationable rotation angle range is set by coming into contact with a locking portion 4A that hangs downward on the side 4.

  In the resistor substrate 2, a substantially annular resistance film 5 having an opening of a predetermined angle is printed on the upper surface of the insulating substrate, and the resistance film 5 serves as a resistance element portion 6.

  A lead-out portion 6A is printed on each end portion of the resistance coating 5 and led out to the end portion side of the substrate 2.

  In addition, in the same figure, in order to make the said resistive film 5 easy to understand, it has shown hatching.

  An annular current collector 7 is printed on the inner peripheral side of the resistive film 5 in a concentric parallel state, and a lead-out portion 7A from the current collector 7 passes through the opening of the resistive film 5. It passes through the end portion of the substrate 2 in parallel with the two lead portions 6A connected to the resistance film 5.

  A slider 8 that is in sliding contact with the resistance element portion 6 and the current collector 7 is fixed to the lower surface of the flange portion 3B of the operation body 3.

  The conventional rotary operation type variable resistor is configured as described above, and the angle during which the step portion 3C provided on the flange portion 3B abuts against the locking portion 4A of the cover 4 can be rotated. In this range, the slider 8 is in sliding contact with the entire range of the resistance coating 5 (in FIG. 8, the angle range is indicated by an arrow).

  In the above configuration, when the operation shaft 3A of the operation body 3 is rotated, the slider 8 fixed to the lower surface of the flange portion 3B is brought into sliding contact with the resistance film 5 and the current collector 7 according to the operation angle. The resistance value obtained is obtained from the lead portions 6A and 7A.

  Usually, a constant voltage V0 is applied between the two lead portions 6A drawn from both ends of the resistance element portion 6, and the output voltage V1 obtained between one lead portion 6A and the current collector 7 is used. In many cases, it is configured to control the device.

  The relationship between the rotation angle (operation position) of the operating body 3 and the output voltage V1 is referred to as resistance change characteristics, and is expressed as a percentage (%) of the output voltage ratio (V1 / V0).

  Here, FIG. 9 shows a resistance change characteristic diagram of the conventional rotary operation type variable resistor.

  In FIG. 9, the horizontal axis represents the rotation angle of the operating body 3, the vertical axis represents the output voltage ratio, the one indicated by the alternate long and short dash line is the prescribed resistance change characteristic, and the one indicated by the solid line is the measured resistance change characteristic. is there.

  The measured resistance change characteristic indicated by the solid line differs from the prescribed resistance change characteristic due to the influence of variations in components and manufacturing, and the maximum difference is indicated by a broken line in FIG.

  The width between the upper and lower broken lines of the maximum difference is the linearity deviation (%).

  As the resistance change characteristics of the rotary operation type variable resistor, the smaller the linearity deviation that is as close as possible to the specified resistance change characteristics, the finer control is possible on the equipment side, in order to improve the function and accuracy of the equipment used. is there.

  For example, in the case of the resistance change characteristic having a linearity deviation of ± 3% shown in FIG. 9, the output voltage at the operation position P is in the range of VP ± 3%.

  An operation position different from the operation position P point that can be identified by the output voltage is an operation position Q point at which an output voltage outside the range of VP ± 3% is obtained.

  Accordingly, in the case of the rotary operation type variable resistor having the resistance change characteristic shown in FIG. 9, the linearity deviation is ± 3%, so the width is 6%, and in the electrical operation range, 100 (%) ÷ 6 (%) ≈16.7, that is, a rotary operation type variable resistor having positional accuracy capable of identifying up to 16 electrical operation ranges.

As prior art document information related to the invention of this application, for example, Patent Document 1 is known.
Japanese Utility Model Publication No. 5-38807

  In the rotary operation type variable resistor, in order to increase the positional accuracy, it is necessary to reduce the linearity deviation. However, in the conventional rotary operation type variable resistor in which the resistance film 5 is formed by printing, the printing accuracy is increased. Development of a new method to improve the resistance, and secondary work, such as selecting the one with small linearity deviation from the printed resistance film 5 or trimming to bring it closer to the specified resistance change characteristic There was a problem.

  The present invention solves such a conventional problem, and does not require a new method development or secondary work for forming a resistance film, and has a high positional accuracy and an inexpensive rotary operation type variable resistor. The purpose is to provide a vessel.

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

  The invention according to claim 1 of the present invention is a rotary operation type variable resistor in which an angular range in which a rotary operation of an operating body held rotatably is restricted to an angular range smaller than 360 degrees, The element substrate includes an insulating substrate, a resistance element portion configured in a substantially annular shape on an upper surface thereof, a first current collector and a second current collector provided concentrically on the resistance element portion, and The resistance element portion includes an arc-shaped resistance film having a predetermined angle that forms a part of the circular ring, and a first conductive portion and a second conductive portion that are respectively connected to both end portions of the resistance element portion. A first slider that slides on the resistance element portion and the first current collector, and a second slider that slides on the resistance element portion and the second current collector. The angle relationship between the two sliders is almost the same as the angle formed by the arc-shaped resistance film. In a state in which the operating body is turned to the start end side of the angular range in which the operating body can be rotated, the first slider is located on one end of the resistive coating on the first conductive portion side or on the first conductive portion. When the operation body is rotated, the first slider slides on the resistance film and the first current collector, and further slides on the resistance film when rotated in the same direction. The moving first slider is moved onto the second conductive part, and the second slider is moved from the first conductive part onto the resistive film so as to slide. This is a rotary operation type variable resistor that slides on the arc-shaped resistance film in succession to the first slider and then the second slider within an angular range that can be rotated. Therefore, within the angle range where the rotation operation is possible, the above-mentioned resistance film first Of the first resistor constituted by the combination of the body and the first slider, and then the second resistor constituted by the combination of the resistance film / second collector and the second slider. Even if the resistance film is formed by the same method as before without using a special method, since one resistor film is made to correspond to a small operating angle range in each resistor. The rotary operation type variable resistor with improved operation position accuracy can be realized at low cost.

  The invention according to claim 2 is the invention according to claim 1, wherein the angle formed by the arc-shaped resistance film is arranged at an angle that is 1/2 of the angle range in which the rotation operation is possible. The first slider is removed from the resistance film and the second slider starts to slide on the resistance film at the central angular position in FIG. 1. With this configuration, the first resistor and the second resistance are obtained. It has the effect that the resistance change characteristic of the vessel can be used most efficiently.

  According to a third aspect of the present invention, in the first aspect of the present invention, before the first slider moves from the resistance film to the second conductive portion, the second slider moves from the first conductive portion to the above. The arrangement angle of the arc-shaped resistance film is set so as to be movable on the resistance film, and the resistance change of the first resistor constituted by the first slider and the resistance element portion is continuous. No change portion is generated between the resistance changes of the two variable resistors, in which the resistance change of the second resistor configured by the second slider and the resistance element portion starts. The operation can be changed, and the operation angle portion where the respective resistance outputs are overlapped has the effect of being able to absorb the influences of components and manufacturing variations.

  According to a fourth aspect of the present invention, in the first aspect of the present invention, the distance between the resistance element portion and the first current collector and the distance between the resistance element portion and the second current collector are equal to each other. A first slider that slides on the resistor element and the first current collector, and a second slider that slides on the resistor element and the second current collector. The shape of the slider can be reduced, and only one type of slider mold is required, and the number of types of members for configuring the rotary operation type variable resistor can be reduced. Has the effect of achieving.

  As described above, according to the present invention, there is provided a rotary operation type variable resistor in which the operation angle range is restricted to an angle range smaller than 360 degrees, and within the angular range in which the rotation operation is possible, a single arc-shaped resistor is provided. The first slider and the second resistor are sequentially generated by sliding the first slider on the coating, followed by the second slider. Because it is configured to correspond to a small operating angle range in the vessel, it can be realized at low cost with high positional accuracy without developing a new method of forming a resistance film and performing secondary work. An advantageous effect is obtained.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  In addition, the same code | symbol is attached | subjected to the part of the structure same as the structure demonstrated in the term of the prior art, and detailed description is abbreviate | omitted.

(Embodiment 1)
Embodiments 1 to 2 and 4 of the present invention will be described using the first embodiment.

  FIG. 1 is an exploded perspective view of a rotary operation type variable resistor according to a first embodiment of the present invention, and FIG. 2 is a sectional view thereof.

  1 and 2, reference numeral 1 denotes a substantially annular case having a cylindrical portion 1B protruding upward around a circular hole 1A, and an outer peripheral region portion thereof is formed as a recess 1C. 1 is an annular resistor substrate placed in one recess 1C.

  Reference numeral 12 denotes an operating body in which the inner surface of the operating shaft 12A configured in a cylindrical shape is rotatably fitted to the outer surface of the cylindrical portion 1B of the case 1, and the flange portion 12B provided below the operating body is in the recess 1C. Is housed in.

  The upper portion of the concave portion 1C of the case 1 is covered with the cover 4 combined with the case 1, and the side surface portion of the step portion 12C provided on the upper surface of the flange portion 12B of the operating body 12 is attached to the cover 4. By contacting the provided locking portion 4A, the rotation angle range in which the rotation operation is possible is restricted.

  In the present embodiment, the arrangement of the printed pattern formed on the upper surface of the resistor substrate 11 and the sliders 13 and 14 slidably contacting the printed pattern is significantly different from the conventional arrangement. It is.

  That is, as shown in the diagram showing the relationship between the printed pattern of the resistor substrate and the slider in FIG. 3, the resistance element portion 18 formed on the insulating substrate of the resistor substrate 11 has a predetermined angle with respect to the rotation center. A resistance film 15 formed in a circular arc shape, a first conductive part 16 arranged in a connected state at the left end of the resistance film 15 as viewed from above, and a second conductive part 17 arranged in a connected state at the right end. , Formed in a substantially annular shape having an opening of a predetermined angle.

  This resistance film 15 is printed and formed by a method similar to the conventional method.

  Note that the other ends of the first and second conductive portions 16 and 17 that are not connected to the resistance film 15 are drawn out to the end portion side of the substrate 11 as lead portions 16A and 17A.

  Then, concentrically with the substantially annular resistance element portion 18 in between, an annular first current collector 19 on the inner peripheral side, and a substantially annular second current collector on the outer peripheral side 20 are printed concentrically at positions equidistant from the resistance element portion 18.

  The lead portions 19A and 20A of the first current collector 19 and the second current collector 20 are also led out to the end of the substrate 11 in the same manner as the lead portions 16A and 17A in the resistance element portion 18.

  On the other hand, on the lower surface of the flange portion 12B of the operation body 12, the first slider 13 sliding on the resistance element portion 18 and the first current collector 19, the resistance element portion 18 and the second current collector are provided. A second slider 14 that slides on 20 is fixed.

  At this time, the first current collector 19 and the second current collector 20 configured concentrically with the resistive element portion 18 in between are arranged at equal intervals from the resistive element portion 18. The first slider 13 that slides on the portion 18 and the first current collector 19 and the second slider 14 that slides on the resistance element portion 18 and the second current collector 20 are the same slide. A child can be used, and only one type of slider mold is required, the number of members used can be reduced, and the cost can be reduced including the management aspect.

  And the 1st slider 13 is in the state turned to the start end side at the time of the right rotation operation in the angle range which can rotate the operation body 12 shown in FIG. It is arranged on the first conductive part 16 close to the left end or on the left end.

  Further, when the second slider 14 is operated at an angular position away from the first slider 13 at the same angle as the angle of the resistance coating 15 printed in the arc shape, and the operating body 12 is rotated clockwise. The first slider 13 slides on the resistance film 15 and the first current collector 19 and further slides on the resistance film 15 when rotated in the same direction. At the same time that the first slider 13 moves to a position on the second conductive portion 17, the first slider 13 moves from the first conductive portion 16 onto the resistive film 15 and starts to slide.

  The arrangement angle of the arc-shaped resistance film 15 is half of the angle range in which rotation is possible, and the arrangement angle between the first slider 13 and the second slider 14 is also rotated. It is arranged at a position that is 1/2 of the operable angle range.

  That is, the second slider 14 is positioned on the second conductive portion 17 and the second current collector 20 in a state where the second slider 14 is fully turned to the start end side when the operating body 12 is rotated clockwise. .

  The rotary operation type variable resistor according to the first embodiment is configured as described above.

  Next, the operation will be described. When the operation shaft 12A is rotated clockwise from the starting end side during the clockwise rotation operation, the first slider 13 fixed to the lower surface of the flange portion 12B slides on the resistance film 15. First, the first resistor composed of the first slider 13, the resistance film 15, and the first current collector 19 functions, and the resistance change starts.

  In addition, the moving range of the said sliders 13 and 14 which move according to the operation state is described by the arrow in FIG.

  Then, if the right rotation operation of the operation shaft 12A is continued as it is and the central angle position of the rotation operation possible range is reached, the first slider 13 moves from the arc-shaped resistance film 15 onto the second conductive portion 17 and slides. Simultaneously with the contact, the second slider 14 moves from the first conductive portion 16 onto the resistance film 15 and starts to slide.

  At this timing, the resistance change from the first resistor becomes stable, and the second resistor composed of the second slider 14, the resistance film 15, and the second current collector 20 starts to function, The resistance change of the second resistor begins.

  Then, when the operation shaft 12A reaches the right rotation end of the rotationally operable range, the second slider 14 is positioned on the second conductive portion 17 on the right end on the resistance film 15 or in the vicinity thereof, and the second resistor. The resistance change becomes stable.

  As described above, according to the present embodiment, only one resistance film 15 is formed. However, in accordance with the clockwise rotation operation, first, from the start end position to the central angular position of the rotation operation shaft range, the first angle is set. The resistor functions, and then the second resistor starts to function, and the second resistor is configured to function up to the end of the rotational operation range.

  The resistance change states of the first and second resistors are shown in the resistance change characteristic diagram of FIG. 4, and will be described in more detail with reference to FIG.

  In FIG. 4, the upper diagram shows the resistance change characteristic of the first resistor constituted by the combination of the resistor element portion 18, the first current collector 19 and the first slider 13, and the lower diagram shows the resistor element portion 18. It is a resistance change characteristic of the 2nd resistor comprised by the combination of the 2nd electrical power collector 20 and the 2nd slider 14, and a horizontal axis is a rotation angle (operation position), and a vertical axis | shaft is output voltage V1 / V0 ( %).

  In the figure, the one indicated by the alternate long and short dash line is the prescribed resistance change characteristic, and the one indicated by the solid line is the measured resistance change characteristic of the rotary operation type variable resistor according to the present embodiment.

  At this time, since the resistance coating 15 is manufactured by the same method as the conventional one, the linearity deviation is ± 3% with respect to the prescribed resistance change characteristic, and the width is 6%, which is the same as the conventional one. The deviation is indicated by a broken line in FIG.

  The resistance change characteristic of the first resistor is 100% at the central angular position of the angular range in which the start position of the right rotation operation can be operated at the output voltage of 0%, and is also 100% in the subsequent rotation range. Yes.

  Further, the resistance change characteristic of the second resistor is the output voltage until the discontinuous state is reached from the start position of the clockwise rotation operation within the range where each of the drawer portions 16A, 17A, and 20A shown in FIG. Is 100%, the output voltage is 0% from the time when the discontinuous state is exceeded to the central angular position of the operating range where the second slider 14 is in sliding contact with the resistance coating 15, and then the operating voltage gradually increases. Reaches 100% at the right end position of rotation.

  Here, with respect to a certain operation position P point, an operation position that can be identified by the output voltage is an output voltage outside the range of the output voltage VP ± 3% of the operation position P point as in the case of the conventional description. The operation position Q is selected.

  That is, in the operation range of the first resistor, 100 (%) ÷ 6 (%) ≈16.7, and it is possible to identify up to 16 resistance change special ranges of the first resistor by the output voltage.

  Similarly, in the operation range of the second resistor, up to 16 resistance change ranges can be identified by the output voltage.

  That is, according to the present embodiment, it is possible to identify up to 16 locations from the right rotation start end position to the central angular position of the rotation operation range, and from the central angular position to the right rotation end position, it is possible to identify up to 16 locations. Therefore, it is possible to identify up to 32 locations in the entire angular range in which the rotation operation is possible.

  The switching from the output detection of the first resistor to the output detection of the second resistor is switched to the output of the second resistor, for example, when the output voltage of the first resistor reaches a value exceeding 98%. As described above, the program may be performed by a microcomputer or the like.

  Further, when the counterclockwise rotation operation is performed from the end of the right rotation, when the output voltage of the second resistor reaches a value that is, for example, less than 2%, the output may be switched to the output detection of the first resistor.

  As described above, according to the present embodiment, in the rotary operation type variable resistor that is restricted to an operation angle range smaller than 360 degrees, within the angular range in which the rotation operation can be performed, on one arc-shaped resistance film 15. The first slider 13 and the second slider 14 are sequentially slid, and the functions of two variable resistors, the first resistor and the second resistor, are sequentially generated. In each of the resistors, Since the one resistance film 15 can be made to correspond to a small operating angle range, the position accuracy is doubled compared with the conventional one without changing the printing method of the resistance film 15 or performing a secondary operation such as sorting. It is possible to realize a rotary operation type variable resistor provided with a low cost.

  The first resistor and the second resistor may start to change at the same time as the output voltage of the first resistor reaches 100% at the central angular position of the angular range in which rotation is possible. Because of the configuration, the resistance change characteristics of the first resistor and the second resistor can be used most efficiently, and the on-board equipment can easily detect the position, including the change of resistance change of the two variable resistors. It will be easy to use.

  Furthermore, although the example which uses the resistive film 15 as two resistors was demonstrated above, you may comprise so that it may be used as three or more resistors.

(Embodiment 2)
A second embodiment of the present invention, particularly the invention according to claim 3, will be described.

  The thing according to the second embodiment is intended to further improve the thing according to the first embodiment.

  That is, according to the first embodiment, the functions of the first resistor and the second resistor are switched in a timely manner at the central angular position of the angular range in which the rotation operation is possible. It is necessary to manufacture with as much as possible.

  For example, the position of the right end connected to the second conductive portion 17 of the resistance coating 15 due to variations in the printing pattern on the resistor substrate 11 is slightly shifted to the left side that is less than the central angular position of the angular range in which rotation is possible. In such a case, even if the output voltage of the first resistor reaches 100%, an output portion of the second resistor does not immediately increase, and an invariable portion that remains 0% for a while is generated. .

  Although it is possible to remove the unchanged part from the 32 recognition positions, it is according to the second embodiment described below that eliminates the restriction.

  FIG. 5 is a diagram showing the relationship between the resistor board pattern of the rotary operation type variable resistor and the slider according to the second embodiment of the present invention, and the position of the slider is the central angle in the operation range. It is illustrated as a state in position.

  In addition, the same code | symbol is attached | subjected to the part of the structure same as the structure of Embodiment 1, and detailed description is abbreviate | omitted.

  The second embodiment is configured by using the resistor substrate 21 shown in FIG. 5. As shown in FIG. 5, the resistor element portion formed on the upper surface of the insulating substrate of the resistor substrate 21. Reference numeral 25 denotes a resistance film 22 that is printed in a circular arc shape with a predetermined angle with respect to the center of rotation by a method similar to the conventional method, and the first conductive portion 23 and the second conductive section 23 that are connected to and connected to both ends of the resistance film 22. The conductive portion 24 is configured in a substantially annular shape having an opening at a predetermined angle.

  The other ends of the first conductive portion 23 and the second conductive portion 24 that are not connected to the resistive film 22 are led out to the end portion side of the substrate 21 as lead portions 23A and 24A.

  In addition, substantially annular first current collector 26 and second current collector 27 are provided concentrically at the inner and outer peripheral positions of the resistance element portion 25 at positions equidistant from the resistance element portion 25, respectively. One end thereof is led out to the end portion side of the substrate 21 as the lead portions 26A and 27A along with the lead portions 23A and 24A.

  In the second embodiment, the first resistor is constituted by the first slider 28 that is in sliding contact with the resistance element portion 25 and the first current collector 26. The point that the second resistor is constituted by the second slider 29 that is in sliding contact with the electric body 27 is the same as that shown in the first embodiment.

  At this time, the first slider 28 and the second slider 29 are arranged in an angle arrangement that is ½ of the angular range in which rotation is possible, as in the first embodiment.

  However, the resistance film 22 arranged in an arc shape is the same as that of the first embodiment from the position corresponding to the start position at the time of the right rotation operation, the first slider 28 and the second slider 29. The difference is that the angle range is slightly larger than the angle formed by the angle, that is, the angle is larger than ½ of the angle range in which the rotation operation can be performed to the extent that it exceeds the range of each component or manufacturing variation. .

  Since other configurations are the same as those according to the first embodiment, description thereof is omitted.

  Next, in the rotary operation type variable resistor according to the second embodiment configured as described above, the resistance change characteristic when the right rotation operation is performed from the right rotation start end in the operable angle range will be described.

  FIG. 6 is a resistance change characteristic diagram of the rotary operation type variable resistor according to the second embodiment, and the upper diagram is constituted by a combination of the resistance element portion 25, the first current collector 26, and the first slider 28. The resistance change characteristic of the first resistor, and the lower diagram shows the resistance change characteristic of the second resistor constituted by the combination of the resistance element portion 25, the second current collector 27, and the second slider 29, The horizontal axis represents the rotation angle, and the vertical axis represents the output voltage V1 / V0 (%).

  In the present embodiment, the resistance film 22 is provided slightly larger than ½ of the angular range in which the rotational operation can be performed. Therefore, as shown in FIG. 5 and the resistance change characteristics of the upper first resistor. The first resistor can be formed before the output voltage reaches 100% when the first slider 28 is still in sliding contact with the resistance film 22 at the central angular position of the angular range in which rotation is possible. On the other hand, the output voltage of the second resistor can be set to a change position that increases from 0% as in the first embodiment.

  The sliding contact position of the first slider 28 moves from the right end of the resistance coating 22 onto the second conductive portion 24 at a position further slightly rotated clockwise from the center position, and the output voltage is 100%. When this happens, the output voltage of the second resistor is always at a position where it has increased from 0%.

  As described above, according to the second embodiment, the output voltage of the first resistor and the output voltage of the second resistor can be switched in a constantly changing state. It is also possible to absorb the effects of variations in combinations, etc., eliminating restrictions on the use of the output voltage switching part of the first resistor and the second resistor, making it easier to use on the equipment side It becomes.

  In the first and second embodiments, the output voltage is increased by the right rotation operation. However, the output voltage may be decreased by the rotation operation in the same direction.

  Further, a configuration in which the output voltage changes linearly by a left rotation operation may be used.

  Further, when the first resistor and the second resistor are switched at the central angular position of the angular range in which the rotation operation can be performed as described above, the resistance change characteristics of the first resistor and the second resistor are most efficient. Although it can be used and is useful, even if the switching position is set to another angular position, it is possible to realize a high position accuracy at a low cost.

  In addition, the first current collector and the second current collector may be formed in an arc shape only at a portion necessary for configuring the first resistor and the second resistor. The effect of is obtained.

  The rotary operation type variable resistor according to the present invention is a rotary operation type variable resistor in which an angular range in which a rotary operation is possible is restricted to an angle range smaller than 360 degrees, and the first slider is formed on one arc-shaped resistance film. The first slider function and the second resistor function are sequentially generated by sliding the second slider in order, and the one resistance film is made to correspond to a small operating angle range in each resistor. Therefore, there is an effect that a high position accuracy can be realized at low cost without developing a new method for forming a resistance film and performing secondary work. It is useful for a rotary operation type variable resistor used for controlling various electronic devices such as temperature control.

1 is an exploded perspective view of a rotary operation type variable resistor according to a first embodiment of the present invention. Cross section The figure which shows the relationship between the printed pattern of the resistor board and the slider Resistance change characteristics The figure which shows the relationship between the pattern of the resistor board of the rotary operation type | mold variable resistor by the 2nd Embodiment of this invention, and a slider. Resistance change characteristics An exploded perspective view of a conventional rotary operation type variable resistor The figure which shows the relationship between the printed pattern of the resistor board and the slider Resistance change characteristics

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Case 1A Circular hole 1B Cylindrical part 1C Recessed part 4 Cover 4A Locking part 11, 21 Resistor board 12 Operation body 12A Operation shaft 12B Flange part 12C Step part 13, 28 First slider 14, 29 Second slider 15, 22 Resistive coating 16, 23 First conductive part 17, 24 Second conductive part 16A, 17A, 19A, 20A, 23A, 24A, 26A, 27A Lead-out part 18, 25 Resistive element part 19, 26 First current collector 20, 27 Second current collector

Claims (4)

A rotary operation type variable resistor in which an angular range in which a rotationally operable operating body can be rotated is regulated to an angular range smaller than 360 degrees, the resistance element substrate is substantially formed on an insulating substrate and an upper surface thereof. A resistance element portion configured in an annular shape, and a first current collector and a second current collector concentrically provided on the resistance element portion, wherein the resistance element portion includes a part of the ring An arc-shaped resistance film formed at a predetermined angle and a first conductive part and a second conductive part connected to both ends thereof, respectively, while the operating body includes the first and second conductive parts on the resistance element part and the first conductive part. The first slider that slides on the current collector and the second slider that slides on the resistance element portion and the second current collector have an arrangement angle relationship between the two sliders. The angle at which the arcuate resistive coating is formed is substantially the same as the angle formed by the arc-shaped resistance film, and the operating body can be rotated. When the first slider is positioned on one end of the resistance coating on the first conductive portion side or the first conductive portion in a state where the first slider is fully turned to the start end side of the enclosure, and the manipulation body is rotated, When the first slider slides on the resistance film and the first current collector and further rotates in the same direction, the first slider slides on the resistance film. A rotary operation type variable resistor in which a child moves on the second conductive part and the second slider moves on the resistance film from the first conductive part and slides. 2. The rotary operation type variable resistor according to claim 1, wherein an angle formed by the arc-shaped resistance film is arranged at an angle that is ½ of an angular range in which the rotation operation is possible. Before the first slider moves from the resistance film onto the second conductive part, the arc-shaped resistance film is formed so that the second slider can move from the first conductive part onto the resistance film. 2. The rotary operation type variable resistor according to claim 1, wherein an arrangement angle is set. 2. The rotary operation type variable resistor according to claim 1, wherein the rotation element type variable resistor is provided so that an interval between the resistance element portion and the first current collector and an interval between the resistance element portion and the second current collector are equal to each other.

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