JPH0541105U - Variable resistor - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a variable resistor in which an output voltage ratio L hardly shifts even if a slight shift occurs between a high resistance pattern and a low resistance pattern printed on a substrate. thing. An insulating substrate 10, a low resistance pattern 25 formed on the insulation substrate 10, a high resistance pattern 20 electrically connected to at least both ends of the low resistance pattern 25, and a high resistance. The variable resistor includes electrode patterns 30 and 31 provided on both sides of the body pattern 20, and a slider provided with a contact that makes sliding contact with each pattern. When printing the low resistance pattern 25, the low resistance pattern 2
The low resistance pattern for connection 27, 2 is located at a position separated by a predetermined distance d from both ends of 5 and electrically connects the high resistance pattern 20 and the electrode patterns 30, 31.
8 is provided. The length of the high resistance pattern 20 is always constant at the distance d between the low resistance pattern 25 and the connecting low resistance patterns 27 and 28.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a variable resistor.

[0002]

[Prior art]

 Conventionally, a rotary variable resistor has been used as a volume for adjusting the temperature of a car air conditioner, for example. And, in this type of car air conditioner, if the variable resistor for temperature adjustment is rotated in one direction (for example, left rotation direction), the set temperature of the air conditioner gradually decreases, and the variable resistor is Immediately before turning in the same direction, the cooling output of the air conditioner switches to the maximum output state (that is, the set temperature is ignored and the maximum cooling output is set), while the variable resistor for temperature setting is rotated in the other direction (right rotation direction). If this is done, the set temperature of the air conditioner gradually rises, and the heating output of the air conditioner switches to the maximum output state immediately before turning the variable resistor in the same direction (i.e., ignoring the set temperature and setting the maximum heating output to the maximum heating output). There is something that works like.

In order to exert such a function, the rotation angle-output voltage ratio characteristic of the slider as shown in FIG. 11 is required. That is, this characteristic is that when the rotation angle of the slider is 0 °, the output voltage ratio L changes abruptly to L ₁ when it rotates by the angle θ _1, and then the output voltage ratio L changes in accordance with the rotation angle θ. Rise in a stepwise manner, and when the rotation angle changes from θ _{n -1} to θ _n , the output voltage ratio L rapidly changes to 1.0.

In order to approximately realize the above characteristics by the rotary variable resistor, as shown by the dotted line in the figure, when the rotation angle of the slider is between θ ₁ and θ _n-1 , the output voltage is changing the ratio L linearly, it is necessary to change as much as possible abrupt 0 or 1.0 the output voltage ratio is at both ends (the range of 0～Shita ₁ and θ _n-1 ~θ _n).

Here, FIG. 8 is a plan view showing a substrate 80 of a conventional rotary variable resistor for obtaining the rotation angle-output voltage ratio of such a slider. Further, FIG. 9 is a schematic cross-sectional view showing a cross-sectional state of each pattern when the outer pattern provided on the substrate 80 is cut from point a to point b shown in FIG.

As shown in both figures, in this substrate 80, an arc-shaped high resistance pattern 83 is first formed on the upper surface of an insulating substrate 81 by screen printing. Next, an arc-shaped low resistance pattern 82 having the same width as the high resistance pattern 83 and a short length is formed on the high resistance pattern 83 by screen printing. At this time, both ends of the high resistance pattern 83 are exposed from both ends of the low resistance pattern 82.

Next, electrode patterns 85 and 86 are screen-printed on both ends of the high resistance pattern 83. At this time, the inner ring-shaped current collecting pattern 87 and the electrode pattern 88 continuous with the current collecting pattern 87 are simultaneously screen-printed.

As a result, an outer track having high resistance patterns 83, 83 provided at both ends of the low resistance pattern 82 and electrode patterns 85, 86 provided at both ends of the low resistance pattern 82, and an inner track made of a current collecting pattern 87 are provided. Complete.

At the center of the insulating substrate 81, there is provided a through hole 90 penetrating a rotary shaft for fixing a slider or the like, and a metal terminal is fixed to each of the electrode patterns 85, 86, 88. Through holes 91, 92, 93 are provided for this purpose.

A slider (not shown) is in sliding contact with each of these patterns. That is, the slider slides on the electrode pattern 85 → high resistance pattern 83 → low resistance pattern 82 → high resistance pattern 83 → electrode pattern 86 from point a shown in FIG. to b. At this time, the slider is also in sliding contact with the current collecting pattern 87 at the same time. Then, for example, a predetermined voltage V ₀ is applied between the electrode patterns 85 and 86 on both sides, the voltage between the electrode patterns 85 and 88 is set as the output voltage V ₁ , and the ratio L = V ₁ / V ₀ is output. Assuming the voltage ratio, the relationship between the rotation angle θ of the slider and the output voltage ratio L is as shown in FIG.

That is, as shown in FIGS. 8 and 10, from the point a of the electrode pattern 85 to the high resistance pattern 83 (ie, θ = 0 to θ ₁ ), the output voltage ratio L Is 0, the output voltage ratio L rises at a steep angle when sliding on the high resistance pattern 83 (that is, θ = θ _{1 to} θ ₂ ), and sliding on the low resistance pattern 82. When the output voltage ratio L rises at a gentle angle (immediately θ = θ _{2 to} θ _n-2 ), it further slides on the high resistance pattern 84 (that is, θ = θ _n-2). through? _n-1) is the output voltage ratio L leads to again rise to L = 1.0 becomes at a steep angle, the angle θ points on the electrode pattern 86 with _n b.

As can be seen by comparing FIG. 10 and FIG. 11, it can be seen that the substrate 80 can obtain the characteristics that are almost required.

[0013]

[Problems to be solved by the device]

 In the above conventional example, as described above, the high resistance pattern 83 is first screen-printed on the substrate 81, then the low resistance pattern 82 is screen-printed thereon, and the electrode patterns 85 and 86 are further screen-printed. Printing is performed, but at this time, the printing position of each pattern may be displaced.

If the shift is in the vertical and horizontal directions shown in FIG. 8, the characteristics shown in FIG. 10 are not changed so much, but a shift occurs in the rotation direction (shown by arrow A) shown in FIG. If it does, a large change is given to the characteristics shown in FIG.

For example, it is assumed that the printing position of the low resistance pattern 82 shown in FIG. 8 is displaced from the high resistance pattern 83 by the angle θ _x ° in the right rotation direction. The cross-sectional state of the outer track at this time is shown in FIG. As can be seen by comparing FIG. 9 with FIG. 9, when the low resistance pattern 82 is displaced to the right, the distance e ₁ between the electrode pattern 85 and the low resistance pattern 82 is widened by an amount corresponding to the displacement. The distance e ₂ between the pattern 86 and the low resistance pattern 82 is narrowed. That is, electrically, the lengths of the high resistance patterns 83, 83 connected to both ends of the low resistance pattern 82 change.

FIG. 13 is a diagram showing a rotation angle θ-output voltage ratio L characteristic of the slider at this time. As shown in the figure, in this case, the resistance values of the high-resistance antibody patterns 83, 83 on the left and right are changed by the rotation angle θ _{x in} which the deviation occurs, and the output voltage ratio L as a whole is l ' Only rises. Therefore, when such a rotary variable resistor is used as a temperature adjusting volume of an air conditioner, a deviation l'in the output voltage ratio L thereof causes a considerable error in the set temperature.

The present invention has been made in view of the above points, and even if there is some deviation between the high resistance pattern and the low resistance pattern printed on the substrate, the deviation of the output voltage ratio L is caused. It provides a variable resistor that hardly causes

[0018]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention provides an insulating substrate 10, a low resistance pattern 25 formed on the insulation substrate 10, and a high resistance pattern electrically connected to at least both ends of the low resistance pattern 25. A variable resistor comprising: a resistor pattern 20, electrode patterns (30, 31) provided on both sides of the high resistor pattern (20); When the pattern 25 is printed, it is connected to a position which is separated from both ends of the low resistance pattern 25 by a predetermined distance d and electrically connects between the high resistance pattern 20 and the electrode patterns 30 and 31. The low resistance pattern 27, 28 for use is provided.

[0019]

[Action]

 According to the above-described configuration, the length of the high resistance pattern 20 does not change even if the misalignment in the rotational direction occurs between the low resistance pattern 25 and the high resistance pattern 20 printed on the insulating substrate 10. The distance d between the low resistance pattern 25 and the connection low resistance patterns 27 and 28 is always constant. Then, the deviation occurs in the low resistance pattern for connection 27, 28 having a low resistance value, and therefore the deviation in the output voltage ratio L hardly occurs.

[0020]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view showing a substrate 1 of a rotary variable resistor according to an embodiment of the present invention. 2 is a schematic cross-sectional view showing a cross-sectional state of each pattern when the outer pattern provided on the substrate 1 is cut from point a to point b shown in FIG. Note that, in FIG. 2, the thickness of each pattern is shown to be considerably thick in order to clearly show the laminated state of each pattern, but in reality, the thickness is so thin that it is almost negligible with respect to the length of the pattern.

To manufacture this substrate 1 as shown in both figures, first, an arc-shaped high resistance pattern 20 is printed on the upper surface of the insulating substrate 10 by screen printing.

Next, an arc-shaped low resistance pattern 25 having the same width as the high resistance pattern 20 and a short length is screen-printed on the high resistance pattern 20. At the same time when the low resistance pattern 25 is printed, the connection low resistance patterns 27 and 28 are also screen-printed at positions separated by a predetermined distance d from both ends of the low resistance pattern 25. The connecting low resistance patterns 27 and 28 are provided so as to be connected to both ends of the high resistance pattern 20.

Here, the low resistance pattern 25 and the connection low resistance patterns 27 and 28 are simultaneously screen-printed using the same mask. Therefore, the length d of the high resistance pattern 20 exposed between the low resistance pattern 25 and the connecting low resistance patterns 27 and 28 can be accurately set to a constant distance.

Next, the electrode patterns 30 and 31 are screen-printed so as to be connected to both ends of the connection low resistance pattern 27, 28. At the same time, the inner ring-shaped current collecting pattern 33 and The electrode pattern 35 continuous with the current collecting pattern 33 is also screen printed.

As a result, the track on the outside of the substrate 1 electrically connects the high resistance patterns 20 and 20 to both ends of the low resistance pattern 25, and connects the low resistance patterns 27 and 28 to both ends thereof. And the electrode patterns 30 and 31 are connected to both ends of the circuit.

A through hole 40 is formed in the center of the insulating substrate 10 so as to penetrate a rotary shaft for fixing a slider or the like, and the electrode patterns 30, 31, 35 are not shown. Through holes 41, 42, 43 for fixing the metal terminals are provided.

A slider (not shown) slides on each of these patterns. That is, the slider is first from the point a shown in the same figure, the electrode pattern 30 → the low resistance pattern 27 for connection → the high resistance pattern 20 → the low resistance pattern 25 → the high resistance pattern 20 → the low resistance pattern for connection. 28-> Slides on the electrode pattern 31 and reaches the point b. At this time, the slider is also in sliding contact with the current collecting pattern 33 at the same time. Then, for example, a predetermined voltage V ₀ is applied between the electrode patterns 30 and 31 on both sides, the voltage between the electrode patterns 30 and 35 is defined as the output voltage V ₁ , and the ratio L = V ₁ / V ₀ is defined as the output voltage. In terms of the ratio, the rotation angle θ of the slider-output voltage ratio L characteristic is as shown in FIG.

That is, as shown in FIGS. 1 and 3, from the point a of the electrode pattern 30 to the connection low resistance pattern 27 (that is, θ = 0 to θ ₁ ), the contact point of the slider is the output voltage. The ratio L is 0, and the output voltage ratio L gradually increases while sliding on the connection low resistance pattern 27 (that is, θ = θ ₁ to θ ₁ ′). Next, when the slider is in sliding contact with the high-resistor pattern 20 (that is, θ = θ ₁ ′ to θ ₂ ), the output voltage ratio L rises at a steep angle, and then on the low-resistor pattern 25. The output voltage ratio L rises at a gentle angle when the sliding contact is made (that is, θ = θ _{2 to} θ _n-2 ), and when the high resistance pattern 20 is slid next (that is, θ = θ 2 _{n-2 to} θ _n-1 ′), the output voltage ratio L again rises at a steep angle, and when the contact is made on the connecting low resistance pattern 28 (that is, θ = θ _n-1 ′ to θ _{n −1} ), the output voltage ratio L again rises at a gentle angle to L = 1.0, and reaches the point b on the electrode pattern 31 at the angle θ _n .

As can be seen by comparing the characteristics shown in FIG. 3 with the characteristics shown in FIG. 11, the required characteristics can be obtained from the base plate 1.

Next, a case where the printing positions of the respective patterns provided on the substrate 1 are displaced in the rotational direction will be described. For example, if the low-resistor pattern 25 of the substrate 1 shown in FIG. 1 is printed with a slight shift in the right rotation direction (the distance h at the rotation angle θ _x ) with respect to the high-resistor pattern 20 printed below it. To do. FIG. 4 is a schematic cross-sectional view showing a cross-sectional state of each pattern at this time. As shown in the figure, in the case of this substrate 1, even if the printing position of the low resistance pattern 25 is displaced from the high resistance pattern 20 by a distance h, both ends of the low resistance pattern 25 and the low resistance for connection are connected. The distance d between the body patterns 27 and 28 remains constant without change. This is because the low resistance pattern 25 and the connection low resistance patterns 27 and 28 can be printed simultaneously with the same mask. Therefore, the length d of the exposed portion of the high resistance pattern 20 does not change on either side.

Further, the length of the low resistance pattern 25 does not change. At this time, the deviation is caused by the length of the exposed portions of the connection low resistance pattern 27, 28.

FIG. 5 shows the rotation angle θ-output of the slider of the substrate 1 in which the printing position of the low resistance pattern 25 is displaced from the high resistance pattern 20 by the angle θ _{x in the} right rotation direction as described above. It is a figure which shows the voltage ratio L characteristic.

In the case of this substrate 1, it is the low resistance pattern connecting low resistance patterns 27 and 28 where the low resistance pattern 25 is displaced as described above, and the high resistance value is high. It is not a part of the high resistance pattern 20. Therefore, as shown by the dotted line in the figure, even if the connecting low resistance patterns 27 and 28 are deviated by an angle θ _x , the resistance value does not change so much, and the output voltage ratio L only rises by 1 as a whole. Is. This shift amount 1 is considerably smaller than the shift amount 1'in the conventional example shown in FIG.

That is, in the case of the substrate 80 shown in FIG. 8, when the printing positions of the high resistance pattern 83 and the low resistance pattern 82 are displaced in the rotation direction, the length of the high resistance pattern 83 changes. Although a large deviation occurs in the output voltage ratio L, in the case of the substrate 1 shown in FIG. 1, the length of the high resistance pattern 20 does not change and is constant, and the low resistance patterns 27 and 28 for connection at both ends thereof are constant. Since only the length of the output voltage changes, the output voltage ratio L hardly changes.

Next, FIGS. 6 and 7 are views showing another embodiment of the present invention, in which only one end on the side of one electrode 31 is shown. As shown in both figures, the stacking order of each pattern can be variously changed.

That is, as shown in FIG. 6A, printing may be performed in the order of the low resistance pattern 25 and the connection low resistance pattern 28 → high resistance pattern 20 → electrode pattern 31. As shown in FIG. 7B, the low resistance pattern 25 and the connection low resistance pattern 28 → the electrode pattern 31 → the high resistance pattern 20 may be printed in this order, or in FIG. As shown, the electrode pattern 31 may be printed in the order of the high resistance pattern 20 and the low resistance pattern 25 and the connection low resistance pattern 28. Alternatively, as shown in FIG. The pattern 31 may be printed in the order of the low resistance pattern 25, the low resistance pattern for connection 28, and the high resistance pattern 20.

Further, as shown in FIGS. 7A to 7D, the high resistance pattern 20 may be provided only in the range where the low resistance pattern 25 and the connection low resistance pattern 28 are connected. Yes. Also in this case, the printing order can be variously changed as shown in FIGS.

Also in each of the embodiments shown in FIGS. 6 and 7, since the low resistance pattern 25 and the connection low resistance pattern 28 can be printed at the same time, the length d of the high resistance pattern 20 does not change, Even if the printing shift occurs between the respective patterns, the output voltage ratio L hardly changes.

In each of the above embodiments, the rotary variable resistor has been described, but it goes without saying that the present invention is not limited to this and may be used for a slide variable resistor.

[0040]

[Effect of the device]

 As described in detail above, according to the variable resistor of the present invention, even if the misalignment in the rotational direction occurs between the low resistance pattern and the high resistance pattern printed on the substrate, the output It has an excellent effect that the voltage ratio L hardly deviates.

[Brief description of drawings]

FIG. 1 is a plan view showing a substrate 1 of a rotary variable resistor according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view showing a cross-sectional state of each pattern when the outer pattern provided on the substrate 1 is cut from a point a to a point b shown in FIG.

FIG. 3 is a diagram showing a rotation angle θ-output voltage ratio L characteristic of a slider of the substrate 1.

FIG. 4 is a schematic cross-sectional view showing a cross-sectional state of each outer pattern when the low-resistor pattern 25 on the substrate 1 is printed with a slight deviation in the clockwise direction from the high-resistor pattern 20.

FIG. 5 is a diagram showing the rotation angle θ-output voltage ratio L characteristic of the slider of the substrate 1 in which the printing position of the low resistance pattern 25 is displaced by the angle θ _{x in the} clockwise direction from the high resistance pattern 20. Is.

FIG. 6 is a view showing another embodiment of the present invention.

FIG. 7 is a view showing another embodiment of the present invention.

FIG. 8 is a plan view showing a substrate 80 of a conventional rotary variable resistor.

9 is a schematic cross-sectional view showing a state of a cross section of each pattern when the outer pattern provided on the substrate 80 is cut from a point a to a point b shown in FIG.

FIG. 10 is a diagram showing a rotation angle θ-output voltage ratio L characteristic of a slider of a substrate 80.

FIG. 11 is a diagram showing required rotation angle-output voltage ratio characteristics of the slider.

FIG. 12 is a schematic cross-sectional view showing a state of the outer pattern when the printing position of the low resistance pattern 82 on the substrate 80 is deviated by an angle θ _x ° in the right rotation direction.

FIG. 13 is a diagram showing a rotation angle θ-output voltage ratio L characteristic of a slider.

[Explanation of symbols]

 10 Insulating Substrate 20 High Resistance Pattern 25 Low Resistance Pattern 27, 28 Connection Low Resistance Pattern 30, 31 Electrode Pattern

Claims (1)

[Scope of utility model registration request] 1. An insulating substrate, a low-resistor pattern formed on the insulating substrate, a high-resistor pattern electrically connected to at least both ends of the low-resistor pattern, and a high-resistor pattern of the high-resistor pattern. A variable resistor comprising an electrode pattern provided on both sides and a slider provided with a contact that makes sliding contact with each pattern, wherein when printing the low resistance pattern, a predetermined value is applied from both ends of the low resistance pattern. A variable resistor characterized in that a low resistance pattern for connection is provided at a position distant from each other and electrically connecting the high resistance pattern and the electrode pattern.