JPS60182702A - 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] Technical 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 whose contact point to a resistance element changes. It is related to the structure of

Technical background The potentiometer transmits an external (regular displacement) to the drive shaft, and by rotating or linearly displacing that shaft, the contacts of the slider placed on the shaft move over the resistive element. 188, and the electrical displacement corresponding to the mechanical displacement is detected by the change in the resistance value caused by the change in the contact point to this primary resistance element.

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 and Its Problems Conventionally, a potentiometer as shown in FIG. 6 has been used.1. . . . In this, sliders 42 and 43 having elastic force are attached to the drive shaft 41, and sliders 42 and 43 are attached to the drive shaft 41.
3 contact point is a resistance element 45 attached to the inner surface of the casing 44
It is designed to slide on the conductor element 46. still,
Reference number 47 is bearing, 48 is spring, 49.50.51
is a terminal.

Apply voltage to terminal 49.5C1'l,
Take out the voltage between 1 and J' as output.

That is, the drive shaft 41 is linearly displaced due to external mechanical displacement, and the contacts of the sliders 42 and 43 attached to the drive shaft 41 slide on the resistance element 45 and the conductor element 4θ, and the mechanical displacement The voltage is detected by a change in resistance value due to a change in the contact point to the resistor cable 45 corresponding to the amount.

Since the sliders 42 and 43 have elastic force, the drive shaft 41
Even if the contact point is tilted, the contact can be changed while reliably contacting the resistive element 45 and the conductive element 46.

However, in this case, there is a problem that the frictional resistance is large and the error becomes large. This is because the contacts of the sliders 42 and 43 slide on the resistive element 45 and the conductive element 4G.

If the contact force of the contact point is reduced, the frictional resistance will be reduced, but
Contact points lack reliability.

Technical Problem Technique 1 of the present invention (the i-problem is to maintain the contact force of the contact point,
This is to change the contact point without sliding.

Technical Means The technical means of the present invention taken to solve the above-mentioned technical problem is to attach a magnet to the drive shaft, arrange a resistive element across the movement range of the magnet apart from the magnet, and Flexible thin plates made of magnetic and conductive material are arranged with gaps provided over the range of movement of the magnet.

Here, a magnet with a strength of ( ) is used to ensure that the flexible thin plate comes into contact with the resistive element.

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

The flexible thin plate is a magnetic material and is attracted to a magnet.

This attractive force deforms the flexible thin plate to ensure that only the portion where the magnet is located comes into contact with the resistance element, and as the magnet is displaced, the portion that contacts the resistance element changes. That is, a flexible thin plate that is a conductor becomes a contact, and the contact changes as the flexible thin plate deforms.

Unique effects The present invention produces the following unique effects.

Since the contacts do not slide, there is no wear on the contacts or resistance elements.
Improves longevity.

The drive shaft and the flexible film that form the contact point are mechanically non-contact, so the frictional resistance of the drive shaft does not increase and errors are small.

Since there is no frictional resistance at the contact points, followability is improved and hysteresis is reduced.

DESCRIPTION OF EMBODIMENTS An embodiment will be described without showing specific examples of the above technique 11j (see FIG. 1.2).

This is a rotary potentiometer, and the casing 1
A drive shaft 2 is attached to the drive shaft 2, which rotates by following external mechanical displacement. The casing 1 is made of a non-magnetic insulator. A bearing 3.4 is interposed between the casing 1 and the drive shaft 2. Attach the mounting shaft 6 to the drive shaft 2 and attach the magnet 5. An annular protruding portion 9 extending to the upper surface of the magnet 5 is formed on the gauging 1. The inner part 11 of the protruding part 9 is formed thinner than the outer part 10. A resistive element 8 is pasted on the upper surface of the inner part 11 over the movement range of the magnet 5.

A very small gap is provided between the protruding portion 9 and the magnet 5.

The protruding portion 9 is formed of a non-magnetic insulator. outer part 1
A flexible thin plate 7 made of a magnetic and conductive material and extending above the resistive element 8 is attached to the upper surface of the magnet 0 over the movement range of the magnet. A plurality of cuts are provided in the portion of the flexible thin plate 7 facing the resistance element 8. Input terminals at both ends of resistor element 80 (not shown)
and a ground terminal (not shown) at one end of the flexible thin plate 7, facing the input terminal and an output terminal (not shown) (=J
Rir.

A voltage is applied between both terminals of the resistance element 8, and a voltage between the input terminal and the output terminal is extracted.

By increasing the number of cuts and making the contact portion of the flexible thin plate needle-like, the change in the contact point can be brought closer to continuous change.

In this embodiment, since a plurality of cuts are provided in the flexible thin plate, it can be easily deformed.

Another embodiment will be described (see Figure 3.4.5).

This is a reciprocating potentiometer, and the casing 21 is divided into two chambers by a thin partition wall 22 made of non-magnetic and insulating material. A drive shaft 23 is attached to one of the chambers for linear displacement following external mechanical displacement. Attach the IaUi 24 to the tip of the drive shaft 23. A bearing ( ) 25 is interposed between the drive shaft 23 and the casing 21 . The partition wall 22 of the other chamber is formed thin on the side where the stones 24 move, and a resistance element 28 is pasted over the movement range of the magnets 24. A flexible thin plate 2G made of a magnetic and conductive material extending to the upper surface of the resistor element 28 is arranged in the thick portion 27 of the partition wall 22 over the movement range of the magnet to form a gap with the resistor element 28. An input terminal (not shown) and a ground terminal (not shown) are attached to both ends of the resistive element 28, and an output terminal (not shown) is attached to one end of the flexible thin plate 26 opposite to the input terminal. .

A voltage is applied between the terminals of the resistance element 28, and a voltage between the input terminal and the output terminal is extracted.

In this embodiment, the resolution of the flexible thin plate is improved because it changes continuously.

The flexible thin plate can be easily processed by simply forming it into a thin plate shape.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of the potentiometer of the present invention;
Fig. 2 is an enlarged perspective view of the contact portion in Fig. 1, Fig. 3 is a sectional view of another embodiment, Fig. 4 is a sectional view taken along line W-77 in Fig. 3,
FIG. 5 is an enlarged perspective view of the contact portion of FIG. 3, and FIG. 6 is a sectional view of a conventional potentiometer. 2.23... Drive shaft, 5.24... Magnet, 7.2
6... Flexible thin plate, 8.28... Resistance element patent applicant

Claims (1)

[Claims] (1) Attach a magnet to the drive shaft, separate it from the magnet, and move the magnet 1IiIJfIi! A resistive element is placed all around the
A potentiometer in which nine flexible thin plates made of magnetic material are arranged with a gap from the resistance element over the range of movement of the magnet.