Non-contact rotary potentiometer based on light refraction principle

Abstract

The invention discloses a non-contact rotary potentiometer based on the principle of light refraction, which includes a casing, a rotating shaft, a refracting lens, a light source, a photosensitive device and a circuit board. The refracting lens is connected to the rotating shaft and can be driven by the rotating shaft to rotate around its own central axis. The photosensitive device is connected to the circuit board correspondingly. The light source and the photosensitive device are respectively located on both axial sides of the refracting lens and the following conditions are met: the outgoing light of the light source can be projected on the photosensitive end of the photosensitive device after being refracted by the refracting lens, and the refracting lens rotates The position of the light emitted from the light source being refracted and projected on the photosensitive end of the photosensitive device is different. The invention realizes the non-contact angular displacement detection function, is not affected by the contact resistance of the contact parts, etc., improves the detection accuracy, and improves the service life of the product; by improving the mechanical connection strength, the anti-vibration ability can be improved, and it can adapt to strong vibration Environment; since it is not affected by magnetism, it is suitable for strong magnetic environments.

Description

technical field [0001] The invention relates to a rotary potentiometer, in particular to a non-contact rotary potentiometer based on the principle of light refraction. Background technique [0002] The rotary potentiometer, also known as the angular displacement potentiometer, is a potentiometer used to detect the rotation angle of an object. It is the core component of the angular displacement sensor, and can also be used directly as an angular displacement sensor. The traditional rotary potentiometer is mainly of the contact type, that is, the rotating shaft drives the brush to touch and slide on the circular resistor to output a changing electrical signal to achieve the purpose of rotation angle detection. The defect of this rotary potentiometer lies in: the brush and the resistor Contact friction is always maintained between the body, so the service life is low, and the precision measurement accuracy is also affected by the contact resistance between the brush and the re...

AI Technical Summary

Problems solved by technology

The traditional rotary potentiometer is mainly of the contact type, that is, the rotating shaft drives the brush to touch and slide on the circular resistor to output a changing electrical signal to achieve the purpose of rotation angle detection. The defect of this rotary potentiometer lies in: the brush and the resistor Contact friction is always maintained between the body, so the service life is low, and the precision measurement accuracy is also affected by the contact resistance between the brush and the resistor body, which reduces the detection accuracy to a certain extent, and the brush needs to rely on elasticity to maintain the contact between the resistor body and the brush. In the strong vibration environment, it will increase the contact resistance between the brush and the resistor body and reduce the detection accuracy, so it is not suitable for the strong vibration environment

[0003] In order to overcome the above problems, potentiometers that use magnetic force to achieve angular displacement calibration, such as magnetic steel potentiometers, have the characteristics of non-contact detection, but this type of potentiometer is subject to external magnetic field interference, even if the metal shell is used to achieve the magnetic isolation effect as much as possible, but in It is difficult to avoid magnetic field interference in a strong magnetic environment, thereby reducing the detection accuracy, that is, this type of potentiometer is not suitable for a strong magnetic environment

[0004] In summary, the traditional rotary potentiometers have their own defects, and it is difficult to adapt to the application environment of strong vibration and strong magnetism.

Images