JPH0754963Y2 - Variable resistor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a rotary operation type variable resistor suitable as a semi-fixed variable resistor or the like.

[Prior Art] As a semi-fixed variable resistor used for adjusting the resistance value at the time of assembling a product or after assembling, a slider along a resistor formed in a substantially horseshoe shape on an insulating substrate has hitherto been used. It was common to have a structure of sliding. That is, the first electrode terminal connected to one end of the resistor is changed by rotating the slider using an adjusting jig such as a driver to change the position of the sliding contact on the resistor. And the resistance value between the second electrode terminal taken out from the slider and the second electrode terminal are changed.

[Problems to be solved by the invention] By the way, as is well known for this type of variable resistor,
There is a strong demand for downsizing and cost reduction. However, in the conventional product described above, in order to take out the second electrode terminal from the slider, for example, the slider is rotatably caulked by the eyelet member penetrating the insulating substrate and extending to the back side. Since the structure is complicated and the parts processing cost and the assembling cost are high, there is a problem that desired miniaturization and cost reduction cannot be achieved.

Therefore, it is an object of the present invention to provide a rotary operation type variable resistor which can be easily miniaturized at low cost.

[Means for Solving the Problems] An object of the present invention described above is to provide a resistor between the first electrode terminal and the second electrode terminal, and to rotate the resistor at a position facing the resistor. Sliding contacts are provided at least at two positions of possible sliders, the sliding contact closest to the first electrode terminal and the resistance value between the first electrode terminal, and the closest to the second electrode terminal. This is achieved by configuring the sliding contact and the resistance value between the second electrode terminals to be the partial resistance value between these two electrode terminals, respectively.

[Operation] According to the above means, since the conductive path between the first and second electrode terminals is short-circuited via the slider, the partial resistance value between the slider and each electrode terminal is different on the resistor. It changes according to the position of the slider, and the total resistance value between both electrode terminals changes accordingly. Therefore, it is not necessary to take out the electrode terminal from the slider, and since the structure is simplified by that much, downsizing can be easily realized and the manufacturing cost can be significantly reduced.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 is an operation explanatory view of the semi-fixed variable resistor according to this embodiment, and FIG. 2 is a sectional view of the semi-fixed variable resistor.

In these figures, a first electrode terminal 2 and a second electrode terminal 3 are attached to the two sides of the insulating substrate 1 which form a pair. On the insulating substrate 1, both electrode terminals 2, A rectangular resistor 4 overlapping with 3 is formed. A box-shaped insulating case 5 is formed integrally with the insulating substrate 1, and a slider receiver 7 having a slider 6 made of a thin metal plate fixed to a circular bottom surface is rotatably incorporated in the insulating case 5. After that, slider holder 7
A semi-fixed variable resistor is formed by fixing a lid 8 having an opening 8a for allowing the upper surface of the slider to be exposed to the upper end surface of the insulating case 5, and a plurality of sliding contacts formed on the slider 6 6a is elastically contacted with the resistor 4.

The center of rotation of the slider support 7 is aligned with the center of the resistor 4, and an adjustment groove 7a extending in a straight line across the center of rotation is formed on the upper surface of the slider support 7. I am doing it. Further, the plurality of sliding contacts 6a of the slider 6 are arranged in a line along the adjustment groove 7a. Therefore, when an adjusting jig such as a driver is inserted into and locked in the adjusting groove 7a and the slider receiver 7 is rotated, the sliding contact 6a group rotates in the direction of the arrow in FIG. , The relative position with respect to the resistor 4 is changed.

In the above configuration, when the rotation angle of the sliding contact 6a group is θ, the total resistance value R between the first electrode terminal 2 and the second electrode terminal 3 is the maximum value R ₀ when θ is 0 degree. And is generally expressed as R≈ (1−sin θ) R ₀ . This is because the conductive path between the first and second electrode terminals 2 and 3 is short-circuited via the slider 6, and therefore, between the sliding contact 6a closest to the first electrode terminal 2 and the electrode terminal 2. The resistance value of R ₁ and the resistance value between the sliding contact 6a closest to the second electrode terminal 3 and the electrode terminal 3 are R ₂
Then, R ₁ and R ₂ are partial resistance values between the electrode terminals 2 and 3, respectively, and the total resistance value is expressed as R = R ₁ + R ₂ . Therefore, when the rotation angle θ increases within the range of 0 degrees and 90 degrees, the total resistance value R decreases and θ becomes 90 degrees.
In degrees, R is minimum.

As described above, in the above-mentioned embodiment in which the total resistance value R is changed by changing the partial resistance values R ₁ and R ₂ according to the rotation angle θ of the sliding contact 6a group, Since it is not necessary to take out the electrode terminal, the structure is simplified as compared with the conventional product. Specifically, the shape of the slider is simple, and the eyelet member and the caulking process are omitted. Therefore, the parts processing cost and the assembly cost are low, and the miniaturization can be easily realized.

In the above embodiment, the total resistance value R is almost equal to the rotation angle θ.
It changes along the sin curve, but for example, the resistor 4
Also, by making such an attempt as widening near the second electrode terminals 2 and 3 and narrowing the width near the middle, a variable resistor whose total resistance value R changes linearly with respect to the rotation angle θ is obtained. You can also

Further, the present invention is not limited to the semi-fixed variable resistor, but can be applied to other rotary operation type variable resistors.

[Effects of the Invention] As described above, according to the present invention, it is not necessary to take out the electrode terminal from the slider, so that the structure can be simplified and the parts processing cost and the assembly cost can be reduced. Variable resistor can be provided at low cost.

[Brief description of drawings]

FIG. 1 is an operation explanatory view of a semi-fixed variable resistor according to an embodiment of the present invention, and FIG. 2 is a sectional view of the semi-fixed variable resistor. 1 ... Insulating substrate, 2 ... First electrode terminal, 3 ... Second electrode terminal, 4 ... Resistor, 6 ... Slider, 6a ... Sliding contact, 7 ... Slider Receiving.

Claims (1)

[Scope of utility model registration request] 1. A rotary operation type variable resistor in which a resistance value between electrode terminals is varied by rotating a slider sliding on a resistor, wherein a first electrode terminal and a second electrode terminal are provided. And a resistor is provided between the slider and the slider, and sliding contacts are provided at least at two positions of a slider that can rotate at a position facing the resistor, and the sliding contact is closest to the first electrode terminal. And a resistance value between the first electrode terminals, and a resistance value between the sliding contact closest to the second electrode terminal and the second electrode terminal, respectively.
A variable resistor having a partial resistance value between the two electrode terminals.