CN113639674B - Non-contact rotary potentiometer based on light refraction principle - Google Patents
Non-contact rotary potentiometer based on light refraction principle Download PDFInfo
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- CN113639674B CN113639674B CN202111190054.5A CN202111190054A CN113639674B CN 113639674 B CN113639674 B CN 113639674B CN 202111190054 A CN202111190054 A CN 202111190054A CN 113639674 B CN113639674 B CN 113639674B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/26—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes
Abstract
The invention discloses a non-contact rotary potentiometer based on a light refraction principle, which comprises a shell, a rotating shaft, a refraction lens, a light source, a photosensitive device and a circuit board, wherein the refraction lens is connected with the rotating shaft and can be driven by the rotating shaft to rotate around a central shaft of the refraction lens, the photosensitive device is correspondingly connected with the circuit board, and the light source and the photosensitive device are respectively positioned at two axial sides of the refraction lens and meet the following conditions: emergent light of the light source can be projected to the photosensitive end of the photosensitive device after being refracted by the refraction lens, and the position of the emergent light of the light source projected to the photosensitive end of the photosensitive device after being refracted in the rotation process of the refraction lens is different. The invention realizes the non-contact angular displacement detection function, is not influenced by the contact resistance of a contact part and the like, improves the detection precision and prolongs the service life of a product; the vibration resistance can be improved by improving the mechanical connection strength, and the device can adapt to a strong vibration environment; because the magnetic force is not influenced, the magnetic field generator is suitable for a strong magnetic environment.
Description
Technical Field
The invention relates to a rotary potentiometer, in particular to a non-contact rotary potentiometer based on a light refraction principle.
Background
The rotary potentiometer is also called an angular displacement potentiometer, is a potentiometer for detecting the rotation angle of an object, is a core component constituting an angular displacement sensor, and can also be directly used as the angular displacement sensor. The traditional rotary potentiometer mainly adopts a contact mode, namely a rotating shaft is utilized to drive an electric brush to contact and slide on a circular resistor body to output a change electric signal to realize the purpose of detecting the rotating angle, and the defects of the rotary potentiometer are as follows: the electric brush is in close contact with the resistor body by virtue of elasticity, so that the contact resistance between the electric brush and the resistor body can be increased in a strong vibration environment, the detection precision is reduced, and the electric brush is not suitable for the strong vibration environment.
In order to overcome the problems, potentiometers such as magnetic steel potentiometers which use magnetic force to realize angular displacement calibration have the characteristic of non-contact detection, but the potentiometers are interfered by external magnetic fields, and even if a metal shell is adopted to realize the magnetic isolation effect as much as possible, the magnetic field interference is difficult to avoid in a strong magnetic environment, so that the detection precision is reduced, namely the potentiometers are not suitable for the strong magnetic environment.
In summary, the conventional rotary potentiometer has various defects, and is difficult to adapt to application environments such as strong vibration and strong magnetism.
Disclosure of Invention
The present invention has been made to solve the above problems, and an object of the present invention is to provide a non-contact rotary potentiometer based on the principle of light refraction that can be adapted to an application environment such as strong vibration or strong magnetism.
The invention realizes the purpose through the following technical scheme:
the utility model provides a rotatory potentiometre of non-contact based on light refraction principle, includes shell and pivot, the pivot passes the shell and through the pivot bearing with the shell is connected, rotatory potentiometre of non-contact still including install in refractive lens, light source, sensitization device and circuit board in the shell, ring shape refractive lens with the pivot is connected and can be quilt the pivot drive is rotatory around self center pin, sensitization device with the circuit board corresponds the connection, the light source with sensitization device is located respectively refractive lens's axial both sides and satisfy following condition: the emergent light of light source passes through can throw after the refraction lens refraction the sensitization end of sensitization device, just it is right in the rotatory in-process of refraction lens the emergent light of light source is thrown after the refraction the position of sensitization end of sensitization device is different.
In the structure, the refraction lens is a lens with refraction effect, the selection of the refraction index is determined according to actual needs, the refraction index and the distance of light passing through the refraction lens jointly determine the position change size of a light source projected on a photosensitive device after the refraction lens rotates for a certain angle, and the position change size is related to the precision of calculating the rotation angle, so that the detection precision needs to be comprehensively considered by combining actual needs and the product volume factor needs to be reduced as much as possible; the light source is a component for generating light beams, and the light source capable of generating the light beams is required to be used for being received by the photosensitive device; the photosensitive device is an electronic element capable of detecting light and converting the light into an electric signal, such as a photoelectric sensor and the like, and is stable as required; and the circuit board is provided with electronic elements such as a microprocessor and the like for processing and calculating the electric signals of the photosensitive device to finally obtain the rotation angle information of the rotating shaft, and the signal output end of the photosensitive device is correspondingly connected with the signal input end of the microprocessor on the circuit board.
As preferred, in order to realize the purpose that the position of throwing on photosensitive device is different when refracting lens rotates, establish the light source is located refracting lens's top photosensitive device is located refracting lens's below refracting lens's central axial is vertical, refracting lens's lower extreme surface is the annular horizontal plane of circle, refracting lens's upper end surface is annular inclined plane or arcwall face. The inclined plane or the arc-shaped surface is a surface with a low end and a high end, namely, the light passes through different distances in the refraction lens, so that the light is reflected by the refraction lens and then is projected on the photosensitive device at different positions, and the size of an included angle between the inclined plane or the arc-shaped surface and the horizontal plane is determined according to actual needs.
According to actual needs, the upper end surface of the refraction lens is formed by connecting two symmetrical inclined planes or arc-shaped surfaces end to end, the structure is favorable for reducing the height of the refraction lens so as to reduce the volume of the whole product, when the rotating shaft rotating angle is larger than 180 degrees, the purpose of calculating the rotating shaft rotating angle by utilizing the two inclined planes or arc-shaped surfaces can be realized by matching time factors, and the calculation difficulty can be improved because time information is combined during calculation, and meanwhile, a certain error exists at the transition position of the two inclined planes or arc-shaped surfaces; or, the upper end surface of the refraction lens starts to rise gradually from a low position to another high position, and the low position and the high position are located on the same vertical straight line, when the rotating shaft rotating angle is larger than 180 degrees but smaller than 360 degrees, the rotating shaft rotating angle can be calculated without time information, so the calculation difficulty can be reduced, meanwhile, no transition position exists in 360 degrees, the calculation result is more accurate, but the height of the refraction lens needs to be higher, and the volume of the whole product can be increased by a few degrees.
Preferably, the light source is a point light source and is mounted on an insulating plate mounted in the housing in order to obtain a light beam having a smaller cross-sectional area and reduce diffused reflection of light.
Preferably, in order to minimize the diffuse reflection of light in order to improve the detection precision of sensitization device, the sensitization device installs the lens hood outward, the upper end of lens hood is equipped with the lens hood through-hole, the rotatory 360 in-process of refractive lens, the emergent light process of light source all can pass behind the refractive lens refraction the lens hood through-hole is thrown sensitization end of sensitization device.
Preferably, in order to further improve the detection accuracy, the light source, the light sensing device, and the light shielding cover are two and are respectively located at two symmetrical sides of the central axis of the refractive lens. The data of the two groups of light sensing components can be comprehensively calculated to reduce errors as much as possible, or one group can work normally after the other group fails.
Preferably, in order to make the connection between the rotating shaft and the refractive lens more compact as much as possible so as to reduce the volume of the whole potentiometer, the rotating shaft is reduced to penetrate through the central through hole of the refractive lens, and the rotating shaft is provided with an outward convex mounting part and is fixedly connected with the refractive lens through the mounting part.
Or, in order to slow down the rotation speed of pivot in order to improve resolution ratio and detection precision, rotatory potentiometre of non-contact still including install in transmission mount pad, drive gear, transmission shaft and the lens installation axle in the shell, the periphery of pivot is equipped with the pivot gear, drive gear through self one end external tooth with the teeth of a cogwheel meshing of pivot gear is connected, drive gear's the other end passes through the transmission bearing and installs in the mounting hole of transmission mount pad, the transmission mount pad with shell fixed connection, the transmission shaft passes drive gear's central through-hole and fixed connection, the one end of lens installation axle with transmission shaft fixed connection, the lens installation axle passes refractive lens's central through-hole, the other end of lens installation axle with refractive lens fixed connection.
Preferably, in order to eliminate or reduce the transmission error of the transmission gear, the transmission gear is an anti-backlash gear.
The invention has the beneficial effects that:
according to the invention, the light source, the refraction lens and the photosensitive device are arranged in the shell, and the purpose of calculating the rotation angles of the refraction lens and the rotating shaft by utilizing the output signals of the photosensitive device is realized by utilizing the characteristic that the light is projected on the photosensitive device at different positions after being refracted at different distances, so that the non-contact type angular displacement detection function is realized, the detection precision is improved, and the service life of a product is prolonged without being influenced by the contact resistance of a contact part and the like; because all the components are in hard connection structures, the vibration resistance can be improved by improving the mechanical connection strength, and the vibration-resistant structure can adapt to strong vibration environments; the magnetic force is not influenced, so that the magnetic field generator is suitable for a strong magnetic environment; and the rotating position of the refraction lens and the position of the photosensitive point of the photosensitive device have absolute corresponding relation, so that the position information is not lost after power failure, and the rotating potentiometer is more advantageous than a resistor-based rotating potentiometer.
Drawings
FIG. 1 is a schematic cross-sectional front view of a non-contact rotary potentiometer according to the principle of light refraction;
FIG. 2 is a perspective view of a refractive lens of the non-contact rotary potentiometer according to the present invention based on the principle of light refraction;
FIG. 3 is a second schematic cross-sectional front view of the non-contact rotary potentiometer according to the light refraction principle of the present invention;
FIG. 4 is a second perspective view of a refractive lens of the non-contact rotary potentiometer according to the light refraction principle of the present invention;
FIG. 5 is a third schematic sectional view of the non-contact rotary potentiometer according to the present invention, which is based on the principle of light refraction;
FIG. 6 is a fourth schematic diagram of the front cross-sectional structure of the non-contact rotary potentiometer according to the present invention based on the light refraction principle;
FIG. 7 is a schematic diagram of the light spot trace on the photosensitive device of the non-contact rotary potentiometer based on the principle of light refraction according to the present invention;
FIG. 8 is a second schematic diagram of the light spot trace on the photosensitive device of the non-contact rotary potentiometer based on the light refraction principle according to the present invention.
In the figure, 1-casing cover, 2-casing base, 3-light-isolating plate, 4-light source, 5-refraction lens, 6-rotating shaft, 7-rotating shaft bearing, 8-central through hole, 9-inclined plane, 10-transverse plane, 11-light shield through hole, 12-photosensitive device, 13-light shield, 14-circuit board, 15-lead, 16-integral inclined plane, 17-rotating shaft gear, 18-transmission mounting base, 19-transmission gear, 20-transmission shaft, 21-lens mounting shaft and 22-transmission bearing.
Detailed Description
The invention is further illustrated by the following examples and figures:
as shown in fig. 1-6, the non-contact rotary potentiometer based on the light refraction principle of the present invention includes a housing and a rotating shaft 6, the housing is formed by connecting a housing base 2 and a housing cover 1, the rotating shaft 6 penetrates through the housing and is connected with the housing through a rotating shaft bearing 7, the non-contact rotary potentiometer further includes a refraction lens 5, a light source 4, a photosensitive device 12 and a circuit board 14 installed in the housing, the annular refraction lens 5 is connected with the rotating shaft 6 and can be driven by the rotating shaft 6 to rotate around its central axis, the photosensitive device 12 is correspondingly connected with the circuit board 14, the light source 4 and the photosensitive device 12 are respectively located at two axial sides of the refraction lens 5 and satisfy the following conditions: emergent light of the light source 4 can be projected on the photosensitive end of the photosensitive device 12 after being refracted by the refraction lens 5, and the positions of the emergent light of the light source 4 projected on the photosensitive end of the photosensitive device 12 after being refracted are different in the rotation process of the refraction lens 5.
The basic working principle of the non-contact rotary potentiometer based on the light refraction principle is as follows: the rotating shaft 6 (connected with other equipment) rotates to drive the refraction lens 5 to rotate, emergent light of the light source 4 is refracted by the refraction lens 5 and then is projected to the photosensitive end of the photosensitive device 12, the projection position of the emergent light changes along with the rotation of the refraction lens 5, the photosensitive device 12 converts the changed photosensitive signals into corresponding electric signals and transmits the electric signals to the microprocessor on the circuit board 14, and the microprocessor obtains angle information of the rotating shaft after signal processing and calculation, so that the angular displacement detection function of the rotating shaft is realized.
To more particularly illustrate various preferred configurations of the present invention, reference is made to the following detailed description taken in conjunction with various embodiments and the accompanying drawings.
Example 1:
as shown in fig. 1 and 2, it is assumed that the light source 4 is located above the refractive lens 5, the photosensitive device 12 is located below the refractive lens 5, the central axis of the refractive lens 5 is vertical, the lower end surface of the refractive lens 5 is a circular horizontal plane 10, the upper end surface of the refractive lens 5 is circular and is formed by connecting two symmetrical inclined planes 9 (or arc planes) end to end, that is, the refractive lens 5 shown in fig. 2 is adopted, the light source 4 is a point light source and is installed on the light-shielding plate 3, the light-shielding plate 3 is installed in the housing, the photosensitive device 12 is externally provided with a light-shielding cover 13, the upper end of the light-shielding cover 13 is provided with a light-shielding cover through hole 11, in the process that the refractive lens 5 rotates 360 degrees, the emergent light of the light source 4 can pass through the light-shielding cover through hole 11 and project onto the photosensitive end of the photosensitive device 12 after being refracted by the refractive lens 5, the light source 4, the photosensitive device 12 and the light-shielding cover 13 are two and are respectively located at two symmetrical sides of the central axis of the refractive lens 5, the rotating shaft 6 passes through a central through hole 8 of the refractive lens 5, and a convex mounting part is arranged on the rotating shaft 6 and is fixedly connected with the refractive lens 5 through the mounting part.
In the structure, the rotating shaft 6 directly drives the refraction lens 5 to synchronously rotate, so that direct transmission is realized, no error exists, and the transmission occupies small volume; the rotation speed of the rotating shaft 6 is the same as that of the refractive lens 5, which is suitable for the application where the rotation speed of the rotating shaft 6 is not too fast, otherwise, the rotation speed too fast may reduce the resolution of the light spot position recognized by the light sensing device 12. The locus of the light spots on the two photosensitive devices 12 (i.e., photosensitive device a and photosensitive device B) is shown in fig. 7 as a linear law similar to a sine curve, and by this law, the angle value of the rotation of the refractive lens 5 and the rotating shaft 6 and the velocity value of the rotation on the differential can be calculated in a backward calculation manner. Also shown in fig. 1, 3, 5 and 6 are leads 15 for input of power and output of a detection signal.
Example 2:
as shown in fig. 3 and 4, it is assumed that the light source 4 is located above the refractive lens 5, the photosensitive device 12 is located below the refractive lens 5, the central axis of the refractive lens 5 is vertical, the lower end surface of the refractive lens 5 is a circular horizontal plane 10, the upper end surface of the refractive lens 5 is a whole inclined plane 16 (or a whole arc surface), which gradually rises from a low position to another high position, and the low position and the high position are located on the same vertical straight line, that is, the refractive lens 5 shown in fig. 4 is adopted, the light source 4 is a point light source and is installed on the light-shielding plate 3, the light-shielding plate 3 is installed in the housing, a light-shielding cover 13 is installed outside the photosensitive device 12, a light-shielding through hole 11 is arranged at the upper end of the light-shielding cover 13, in the process of rotating the refractive lens 5 by 360 °, the emergent light of the light source 4 can pass through the light-shielding through hole 11 and project onto the photosensitive end of the photosensitive device 12 after being refracted by the refractive lens 5, the light source 4, the photosensitive device 12 and the light shield 13 are two and are respectively located on two symmetrical sides of the central axis of the refractive lens 5, the rotating shaft 6 penetrates through the central through hole 8 of the refractive lens 5, and the rotating shaft 6 is provided with a convex mounting part and is fixedly connected with the refractive lens 5 through the mounting part. Description of the drawings: the integral inclined plane 16 and the inclined plane 9 of the embodiment 1 adopt different numbers because two inclined planes are different, one is the annular integral inclined plane 16, and the other is formed by connecting two semicircular inclined planes 9.
The same as the embodiment 1, the rotation of the rotating shaft 6 directly drives the refraction lens 5 to synchronously rotate, and the transmission is direct, so that no error exists, and the transmission occupies small volume; the rotation speed of the rotating shaft 6 is the same as that of the refractive lens 5, which is suitable for the application where the rotation speed of the rotating shaft 6 is not too fast, otherwise, the rotation speed too fast may reduce the resolution of the light spot position recognized by the light sensing device 12. The light spot trajectories on the two photo-sensors 12 (i.e. photo-sensor a and photo-sensor B) are shown in fig. 8 as a linear law similar to a right triangle, and by this law, the angle value of the rotation of the refractive lens 5 and the rotation shaft 6 and the velocity value of the rotation on the differential can be calculated by reverse calculation.
Example 3:
as shown in fig. 5, it is assumed that the light source 4 is located above the refractive lens 5, the photosensitive device 12 is located below the refractive lens 5, the central axis of the refractive lens 5 is vertical, the lower end surface of the refractive lens 5 is a circular transverse plane 10, the upper end surface of the refractive lens 5 is circular and is formed by connecting two symmetrical inclined planes 9 (which may also be arc planes) end to end, namely, the refraction lens 5 shown in figure 2 is adopted, the light source 4 is a point light source and is arranged on the light-shielding plate 3, the light-shielding plate 3 is arranged in the shell, the light-shielding cover 13 is arranged outside the photosensitive device 12, the upper end of the light-shielding cover 13 is provided with the light-shielding through hole 11, in the process that the refraction lens 5 rotates 360 degrees, emergent light of the light source 4 can penetrate through the light shield through hole 11 and project on the light sensing end of the light sensing device 12 after being refracted by the refraction lens 5, and the light source 4, the light sensing device 12 and the light shield 13 are two and are respectively positioned on two symmetrical sides of the central axis of the refraction lens 5; the non-contact rotary potentiometer further comprises a transmission mounting seat 18, a transmission gear 19, a transmission shaft 20 and a lens mounting shaft 21 which are mounted in the shell, a rotating shaft gear 17 is arranged on the periphery of the rotating shaft 6, the transmission gear 19 is meshed with gear teeth of the rotating shaft gear 17 through outer teeth at one end of the transmission gear 19, the other end of the transmission gear 19 is mounted in a mounting hole of the transmission mounting seat 18 through a transmission bearing 22, the transmission mounting seat 18 is fixedly connected with the shell, the transmission shaft 20 penetrates through a central through hole of the transmission gear 19 and is fixedly connected with the transmission shaft, one end of the lens mounting shaft 21 is fixedly connected with the transmission shaft 20, the lens mounting shaft 21 penetrates through a central through hole 8 of the refraction lens 5, the other end of the lens mounting shaft 21 is fixedly connected with the refraction lens 5, and the transmission gear 19 is an anti-backlash gear.
In the structure, the rotation of the rotating shaft 6 drives the rotating shaft gear 17 to synchronously rotate, the rotating shaft gear 17 drives the transmission gear 19 to rotate according to a certain transmission ratio, the transmission gear 19 drives the transmission shaft 20 and the lens mounting shaft 21 to synchronously rotate, and the rotation speed of the rotating shaft 6 can be reduced through the transmission of the transmission gear 19 so as to improve the resolution of the light spot position recognized by the photosensitive device 12, thereby improving the detection precision, but the transmission occupies a larger volume; the method is suitable for the application where the rotating speed of the rotating shaft 6 is too high, otherwise, the rotating speed of the refractive lens 5 is too high, and the resolution of the light spot position recognized by the light-sensing device 12 is reduced. As in embodiment 1, the locus of the light spots on the two photosensitive devices 12 (i.e., photosensitive device a and photosensitive device B) is in a linear law similar to a sine curve as shown in fig. 7, and by this law, the angle value of the rotation of the refractive lens 5 and the rotation shaft 6 and the velocity value of the rotation in the differential can be calculated by reverse extrapolation.
Example 4:
as shown in fig. 6, it is assumed that the light source 4 is located above the refractive lens 5, the photosensitive device 12 is located below the refractive lens 5, the central axis of the refractive lens 5 is vertical, the lower end surface of the refractive lens 5 is a circular horizontal plane 10, the upper end surface of the refractive lens 5 is a whole inclined plane 16 (or a whole arc surface), which gradually rises from a low position to another high position, and the low position and the high position are located on the same vertical straight line, that is, the refractive lens 5 shown in fig. 4 is adopted, the light source 4 is a point light source and is installed on the light-shielding plate 3, the light-shielding plate 3 is installed in the housing, the photosensitive device 12 is externally installed with a light-shielding cover 13, the upper end of the light-shielding cover 13 is provided with a light-shielding cover through hole 11, in the process of the refractive lens 5 rotating 360 °, the emergent light of the light source 4 can pass through the light-shielding cover through hole 11 and project on the photosensitive end of the photosensitive device 12 after being refracted by the refractive lens 5, the light source 4, the photosensitive device 12 and the light shield 13 are two and are respectively positioned at two symmetrical sides of the central axis of the refractive lens 5; the non-contact rotary potentiometer further comprises a transmission mounting seat 18, a transmission gear 19, a transmission shaft 20 and a lens mounting shaft 21 which are mounted in the shell, a rotating shaft gear 17 is arranged on the periphery of the rotating shaft 6, the transmission gear 19 is meshed with gear teeth of the rotating shaft gear 17 through outer teeth at one end of the transmission gear 19, the other end of the transmission gear 19 is mounted in a mounting hole of the transmission mounting seat 18 through a transmission bearing 22, the transmission mounting seat 18 is fixedly connected with the shell, the transmission shaft 20 penetrates through a central through hole of the transmission gear 19 and is fixedly connected with the transmission shaft, one end of the lens mounting shaft 21 is fixedly connected with the transmission shaft 20, the lens mounting shaft 21 penetrates through a central through hole 8 of the refraction lens 5, the other end of the lens mounting shaft 21 is fixedly connected with the refraction lens 5, and the transmission gear 19 is an anti-backlash gear. Description of the drawings: the integral inclined plane 16 and the inclined plane 9 of the embodiment 3 adopt different numbers because two inclined planes are different, one is the annular integral inclined plane 16, and the other is formed by connecting two semicircular inclined planes 9.
The same as the embodiment 3, the rotation of the rotating shaft 6 drives the rotating shaft gear 17 to rotate synchronously, the rotating shaft gear 17 drives the transmission gear 19 to rotate according to a certain transmission ratio, the transmission gear 19 drives the transmission shaft 20 and the lens mounting shaft 21 to rotate synchronously, and the rotation speed of the rotating shaft 6 can be reduced through the transmission of the transmission gear 19, so that the resolution of the light spot position recognized by the photosensitive device 12 is improved, the detection precision is improved, but the transmission occupies a larger volume; the method is suitable for the application where the rotating speed of the rotating shaft 6 is too high, otherwise, the rotating speed of the refractive lens 5 is too high, and the resolution of the light spot position recognized by the light-sensing device 12 is reduced. As in embodiment 2, the locus of the light spots on the two photosensitive devices 12 (i.e., photosensitive device a and photosensitive device B) is in a linear law similar to a right triangle as shown in fig. 8, and by this law, the angle value of the rotation of the refractive lens 5 and the rotation shaft 6 and the velocity value thereof in the differential can be calculated by reverse calculation.
The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the technical solutions of the present invention, so long as the technical solutions can be realized on the basis of the above embodiments without creative efforts, which should be considered to fall within the protection scope of the patent of the present invention.
Claims (7)
1. A non-contact rotary potentiometer based on the light refraction principle comprises a shell and a rotating shaft, wherein the rotating shaft penetrates through the shell and is connected with the shell through a rotating shaft bearing, and the non-contact rotary potentiometer is characterized in that: rotatory potentiometre of non-contact still including install in refractive lens, light source, sensitization device and circuit board in the shell, ring shape refractive lens with the pivot is connected and can by the pivot drive is rotatory around self center pin, sensitization device with the circuit board corresponds and is connected, the light source with sensitization device is located respectively refractive lens's axial both sides just satisfy following condition: emergent light of the light source can be projected to the photosensitive end of the photosensitive device after being refracted by the refraction lens, and the positions of the emergent light of the light source projected to the photosensitive end of the photosensitive device after being refracted are different in the rotation process of the refraction lens; the light source is arranged above the refraction lens, the photosensitive device is arranged below the refraction lens, the central axial direction of the refraction lens is vertical, the lower end surface of the refraction lens is a circular transverse plane, the upper end surface of the refraction lens is a circular inclined plane or arc-shaped surface, and the upper end surface of the refraction lens is formed by connecting two symmetrical inclined planes or arc-shaped surfaces end to end; or the upper end surface of the refraction lens gradually rises from a low position to another high position, and the low position and the high position are positioned on the same vertical straight line.
2. The non-contact rotary potentiometer according to the light refraction principle, wherein the potentiometer comprises: the light source is a point light source and is arranged on a light-shielding plate, and the light-shielding plate is arranged in the shell.
3. The non-contact rotary potentiometer according to the light refraction principle, wherein the potentiometer comprises: the utility model discloses a light sensing device, including light sensing device, lens, refracting lens, lens through-hole, lens cover, light sensing device installs the lens cover outward, the upper end of lens cover is equipped with the lens cover through-hole, the rotatory 360 in-process of refracting lens, the emergent light process of light source all can pass after the refracting of refracting lens the lens cover through-hole is projected the sensitization end of light sensing device.
4. The non-contact rotary potentiometer according to the light refraction principle, wherein the potentiometer comprises: the light source, sensitization device with the lens hood is two and is located respectively the symmetry both sides of refracting lens's the central axis.
5. Non-contact rotary potentiometer according to any of the claims 1 to 4, characterized in that: the pivot passes refractive lens's central through-hole, be equipped with the installation department of evagination in the pivot and through this installation department with refractive lens fixed connection.
6. Non-contact rotary potentiometer according to any of the claims 1 to 4, characterized in that: rotatory potentiometre of non-contact still including install in transmission mount pad, drive gear, transmission shaft and lens installation axle in the shell, the periphery of pivot is equipped with the pivot gear, drive gear through self one end external tooth with the teeth of a cogwheel meshing of pivot gear is connected, drive gear's the other end passes through the transmission bearing and installs in the mounting hole of transmission mount pad, the transmission mount pad with shell fixed connection, the transmission shaft passes drive gear's central through-hole and fixed connection, the one end of lens installation axle with transmission shaft fixed connection, the lens installation axle passes the central through-hole of refraction lens, the other end of lens installation axle with refraction lens fixed connection.
7. The non-contact rotary potentiometer according to the light refraction principle, wherein the potentiometer comprises: the transmission gear is an anti-backlash gear.
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