JPS61147502A - Potentiometer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a potentiometer used as a position detection means such as angle or linear displacement, and in particular, a potentiometer that is displaced following external mechanical displacement and changes the contact point to a resistive element. It concerns the structure of the part.

The potentiometer transmits external mechanical displacement to the drive shaft,
Due to the rotation or linear displacement of the shaft, the contacts of the slider attached to the shaft slide over the resistance element, and the change in resistance due to the change in the contact to the resistance element corresponds to the amount of mechanical displacement. This is to detect the electrical displacement m.

Therefore, in such a potentiometer, it is necessary that the contacts of the slider reliably come into contact with the resistance element, and that the contacts change in accordance with external mechanical displacement.

Prior Art Therefore, in the past, a potentiometer as shown in FIG. 5 was used. In this case, sliders 52 and 53 having elastic force are attached to the drive shaft 51 so that the contact points of the sliders 52 and 53 slide on the resistance element 55 and conductor element 56 attached to the inner surface of the casing 54. It is something. Note that reference number 57 is a bearing, 58 is a spring, and 59, 60, and 61 are terminals.

An applied voltage is applied between terminals 59 and 60, and the voltage between terminals 59 and 61 is taken out as an output.

The drive shaft 51 is linearly displaced by external mechanical displacement,
The contact point of the slider 52,53 attached to the drive shaft 51 slides on the resistive element 55 and the conductive element 56, and the resistance value changes due to the change in the contact point to the resistive element 55 corresponding to the 1wC displacement m. Detect voltage.

Since the sliders 52 and 53 have elastic force, even if the drive shaft 51 is tilted, the contact points can be changed while reliably contacting the resistive element 55 and the conductive element 56.

Problems to be Solved by the Invention In this case, there is a problem that the displacement resistance becomes relatively large and the error becomes large. This is because when the contacts of the sliders 52 and 53 slide on the resistive element 55 and the conductive element 56, the sliding I
This is because it works with low friction resistance.

If the contact force of the contact point is reduced, the displacement resistance will be reduced, but
Contacts are unreliable.

The technical problem of the present invention is to reduce displacement resistance without weakening the contact force of the contacts.

Means for Solving the Problems The technical means of the present invention taken to solve the above-mentioned technical problems is to connect a bearing to the drive shaft, and to move the bearing! Two resistive elements or a resistive element and a conductive element are attached over a force range, and a bearing is biased against the resistive element or conductive element using an elastic member.

Here, the elastic member used is one strong enough to ensure that the bearing contacts the resistance element and the conductor element.

Action of technical means The operation of the above technical means is as follows.

The bearing is urged by the elastic member to reliably contact the resistive element and the conductive element, and is moved over the element as the drive shaft is displaced. In other words, the bearing becomes a contact point, and the contact point changes by rolling on the element, so rolling frictional resistance acts between the bearing and the element, reducing displacement resistance.

Effect of the invention The present invention produces the following unique effects.

Since the rolling friction resistance is extremely small compared to the sliding friction resistance, the potentiometer of the present invention has a lower resistance than the conventional one.
Accuracy is better than 1 digit.

Since the entire outer peripheral surface of the bearing can be used as a contact point, the life of the contact point is extended.

Since the displacement resistance is small, contact followability is improved, hysteresis is small, and resolution is improved.

Embodiment An embodiment illustrating a specific example of the above technical means will be described (see FIGS. 1 and 2).

A drive shaft 2 is attached to a casing 1 to be displaced in accordance with external mechanical displacement. A bearing 3 is interposed between the casing 1 and the drive shaft 2. A housing cylinder 4 is attached to the tip of the drive shaft 2. Containment I! Two bearings 5.6 are accommodated within 14. Openings are formed in the upper and lower surfaces of the housing cylinder 4 through which the outer peripheral portions of the bearings 5 and 6 protrude. A spring 9.10 is installed between the fixed shaft 7.8 of the bearing 5.6. Bearing 5 is located on the inner surface of casing 1 opposite to bearing 5.6.
The resistance element 11 and the conductor element 12 are pasted over the movement range. An input terminal 13 and a ground terminal 1 are connected to both ends of the resistive element 11.
4, an output terminal 15 is attached to one end of the conductor element 12 so as to face the input terminal 13.

Applying a voltage between both terminals 13 and 14 of the resistance element 11,
The voltage between the input terminal 13 and the output terminal 15 is taken out. Bearing 5.6 and spring 9.10 are conductors.

The drive shaft 2 is linearly displaced by an external mechanical displacement, and the bearing 5.6 in the housing cylinder 3 attached to the drive shaft 2 is biased by the spring 9.10, and the resistance element 11 and the conductor element 12 are biased. Transfer while in touch. Bearing 5.6 and element 11.1
2, rolling frictional resistance acts, reducing displacement resistance. Voltage is detected by a change in resistance value due to a change in the contact point of the bearing 5 to the resistance element 11 corresponding to the amount of mechanical displacement.

Another embodiment will be described (see FIGS. 3 and 4).

Components corresponding to those in FIGS. 1 and 2 are given the same reference numerals and detailed explanations will be omitted.

In this embodiment, one bearing 31 is arranged in the housing cylinder 4, the resistance element 11 and the conductor element 12 are installed side by side on the inner surface of the casing 1 facing the bearing 31, and the fixed shaft 32 of the bearing 31 is housed. A spring 9.10 is arranged between the cylinders 4.

Since the outer peripheral surface of one bearing 31 can be in contact with the resistance element 11 and the conductor element 12, the number of parts can be reduced and the shape can be made smaller.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a potentiometer according to an embodiment of the present invention;
Fig. 2 is a cross-sectional view taken along the line ■-] in Fig. 1, Fig. 3 is a cross-sectional view of another embodiment, Fig. 4 is a cross-sectional view taken along the Il -■ line in Fig. 39, and Fig. 5 is a conventional potentiometer. FIG.

Claims (1)

[Claims] (1) A potentiometer in which a bearing is connected to a drive shaft, two resistance elements or a resistance element and a conductor element are attached over the range of movement of the bearing, and the bearing is biased against the element by an elastic member.