Non-contact photoelectric encoder and angle measurement apparatus

Abstract

Disclosed in the present invention are a non-contact photoelectric encoder and an angle measurement apparatus. The non-contact photoelectric encoder comprises a fixed disk, a movable disk and a plurality of photoelectric sensors; the movable disk is rotatably arranged about its own central axis, and the movable disk is provided with multiple circles of code tracks in the radial direction thereof, each code track being provided with a plurality of sectors in the circumferential direction thereof; the sectors comprises first sectors and second sectors encoded in a Gray code manner, the optical properties of the first sectors and the second sectors being differentially configured; the plurality of photoelectric sensors are arranged at the fixed disk in one-to-one correspondence with the code tracks, each photoelectric sensor comprising a transmitting component and a receiving component that are arranged in pairs, the transmitting component being configured to emit sensing light rays toward sectors which movably pass by same, and the receiving component being configured to receive the sensing light rays. The present invention facilitates non-contact, highly stable and highly reliable angle measurement.

Description

Non-contact photoelectric encoder and angle measuring device Technical Field

[0001] This invention relates to the field of encoder technology, specifically to a non-contact photoelectric encoder and an angle measuring device. Background Technology

[0002] An optical encoder is an angle measuring device that integrates optics, mechanics, and electronics. It converts optical signals into electrical signals through mechanical structures and signal processing circuits, thereby enabling direct or indirect measurement of various physical quantities such as angular displacement, position, and velocity. Technical issues

[0003] The main objective of this invention is to provide a non-contact photoelectric encoder and angle measuring device with stable performance and high reliability. Technical solutions

[0004] To achieve the above objectives, the present invention proposes a non-contact photoelectric encoder, comprising:

[0005] Fixed plate;

[0006] A movable disk, coaxial with and spaced opposite to the fixed disk, is rotatable about its central axis. The movable disk has multiple rings of code tracks radially, and each code track has multiple sectors circumferentially. Each sector includes a first sector and a second sector encoded according to Gray code, and the optical properties of the first sector and the second sector are differentiated.

[0007] Multiple photoelectric sensors are arranged on the fixed disk, one for each of the code tracks. Each photoelectric sensor includes a pair of transmitting and receiving elements. The transmitting element emits sensing light toward the sector that it moves through, and the receiving element receives the sensing light.

[0008] Optionally, the emitting surface of the emitting element and / or the receiving surface of the receiving element extend along a direction that is radially inclined relative to the fixed disk.

[0009] Optionally, the reflectivity of the first sector and the second sector are set differently;

[0010] The fixed disk is provided on one side of the axial direction of the movable disk. The pair of transmitting and receiving components are both located on the fixed disk and are situated within the orthographic projection area formed by the sector that the movable disk passes through. The receiving component is used to receive the inductive light reflected back by the sector.

[0011] Optionally, the transmitting and receiving components, which are arranged in pairs, are spaced apart circumferentially or tangentially along the fixed disk.

[0012] Optionally, the movable disk includes a transparent disk body and a reflective coating applied to the entire surface of the transparent disk body, wherein the reflective properties of the reflective coating applied to the first sector and the reflective coating applied to the second sector are configured to be different; or,

[0013] The movable disk includes a transparent disk body and a reflective coating applied to a portion of the disk surface of the transparent disk body. The disk surface coated with the reflective coating constitutes the first sector, and the remaining disk surface constitutes the second sector; or...

[0014] The movable disk includes a reflective disc body, a portion of which is hollowed out, forming the second sector, and the remaining portion forming the first sector.

[0015] Optionally, the light transmission performance of the first sector and the second sector are set differently;

[0016] The fixed disk is provided in two parts, which are respectively located on both sides of the axial direction of the movable disk, and are respectively a first disk body and a second disk body. The transmitting element is located on the first disk body and is located in the orthographic projection area of ​​the sector that the movable disk passes through on the first disk body. The receiving element is located on the second disk body and is located in the orthographic projection area of ​​the sector that the movable disk passes through on the second disk body. The receiving element is used to receive the sensed light transmitted through the sector.

[0017] Optionally, the orthographic projection of the transmitting surface of the paired transmitting elements onto the second disk body falls within the receiving surface of the receiving element.

[0018] Optionally, the movable disk includes a transparent disk body and a light-shielding coating applied to the entire surface of the transparent disk body, wherein the light-shielding coating applied to the first sector and the light-shielding coating applied to the second sector have different light transmittance properties; or,

[0019] The movable disk includes a transparent disk body and a light-shielding coating applied to a portion of the disk surface of the transparent disk body. The disk surface coated with the light-shielding coating constitutes the first sector, and the remaining disk surface constitutes the second sector; or...

[0020] The movable disc includes a disc body with a partially open surface. The open surface of the disc body forms the second sector, and the remaining surface forms the first sector.

[0021] Optionally, the photoelectric sensors are arranged sequentially along the same radial direction of the fixed disk; or,

[0022] The photoelectric sensors are arranged in a staggered manner along the circumference of the fixed disk;

[0023] Each sector is encoded according to the arrangement of each photoelectric sensor.

[0024] In addition, to achieve the above objectives, the present invention also provides an angle measuring device, including the non-contact photoelectric encoder described above. Beneficial effects

[0025] In the technical solution provided by this invention, the multi-turn code track helps to provide absolute position information, and can still retain the last position information even after power failure and restart without recalibration; it can also provide very high resolution and position accuracy, ensuring precise position control; and encoding each sector according to Gray code to obtain the first sector and second sector with different optical performance helps to simplify the structural design and can significantly reduce errors caused by contact switching during signal conversion, thereby improving the reliability of the system; combined with the detection of photoelectric sensors, it helps to realize non-contact, highly stable and highly reliable angle measurement. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0027] Figure 1 is a perspective view of a first embodiment of the non-contact photoelectric encoder provided by the present invention;

[0028] Figure 2 is a perspective view of a second embodiment of the non-contact photoelectric encoder provided by the present invention;

[0029] Figure 3 is a three-dimensional schematic diagram of the third embodiment of the non-contact photoelectric encoder provided by the present invention at the movable disk;

[0030] Figure 4 is a three-dimensional schematic diagram of the fourth embodiment of the non-contact photoelectric encoder provided by the present invention at the movable disk.

[0031] Explanation of icon numbers:

[0032] 100 Fixed disk; 110 First disk body; 120 Second disk body; 200 Movable disk; 210 Code track; 211 First sector; 212 Second sector; 220 Mounting position projection area; 300 Photoelectric sensor; 310 Transmitting component; 320 Receiving component.

[0033] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Embodiments of the present invention

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0035] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0036] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0037] Please refer to Figures 1 to 4. This invention provides a non-contact photoelectric encoder and the angle measurement device applied thereto. It is understood that the angle measurement device can be any device that requires a non-contact, absolute encoder to measure the rotation angle during its own operation.

[0038] Specifically, the non-contact photoelectric encoder includes a fixed disk 100, a movable disk 200, and multiple photoelectric sensors 300. The movable disk 200 is coaxial with the fixed disk 100 and arranged opposite each other at intervals. The movable disk 200 is rotatable around its own central axis. The movable disk 200 has multiple code tracks 210 along its radial direction. Each code track 210 has multiple sectors along its circumference. Each sector includes a first sector 211 and a second sector 212 encoded according to Gray code. The optical performance of the first sector 211 and the second sector 212 is set differently. Multiple photoelectric sensors 300 are arranged one-to-one with each code track 210 at the fixed disk 100. Each photoelectric sensor 300 includes a pair of transmitting elements 310 and receiving elements 320. The transmitting element 310 is used to emit sensing light towards the sector that the sensor moves through, and the receiving element 320 is used to receive the sensing light.

[0039] In the technical solution provided by this invention, the multi-circle code track 210 helps to provide absolute position information, and can still retain the last position information even after power failure and restart without recalibration; it can also provide very high resolution and position accuracy, ensuring precise position control; and encoding each sector according to Gray code to obtain the first sector 211 and the second sector 212 with different optical performance helps to simplify the structural design and can significantly reduce errors caused by contact switching during signal conversion, thereby improving the reliability of the system; combined with the detection of the photoelectric sensor 300, it helps to realize non-contact, highly stable and highly reliable angle measurement.

[0040] It is understood that the fixed disk 100 and the movable disk 200 are coaxially arranged, and their shapes and sizes are roughly compatible. The fixed disk 100 is a disk body that is fixed in position, at least in the direction of rotation. The movable disk 200 can rotate around its own central axis. The rotation of the movable disk 200 can be driven by any suitable method, such as by a specially designed rotary drive mechanism that is connected to the movable disk 200.

[0041] The movable disk 200 has multiple concentric code tracks 210. That is, each code track 210 is arranged in multiple concentric rings from the center of the movable disk 200 to its outer perimeter. Each code track 210 is a concentric ring. Generally, the width of the concentric rings corresponding to each code track 210 is approximately the same, so that the shape and size of the sectors divided on the same code track 210 are basically consistent, and the shape and size of the sectors divided on different code tracks 210 maintain a relatively uniform variation.

[0042] Each sector on each code track 210 is encoded using Gray code, thereby dividing it into several first sectors 211 and several second sectors 212. Since this design does not limit the number of loops in the code track 210, the specific representations of the number and arrangement of the first sectors 211 and second sectors 212 obtained by Gray code encoding may differ. However, it is understandable that to minimize the angular resolution, the number of loops in the code track 210 can be set to a relatively large number. For example, as shown in Figures 3 and 4, when the number of loops in the code track 210 is set to 4, the maximum circumferential resolution is 360 / 16 = 22.5 degrees. When the number of loops in the code track 210 is set to 8, the maximum circumferential resolution is 360 / 256 = 1.4 degrees. Of course, when the number of loops in the code track 210 is set to 8, only a segment can be taken, for example, divided into 180 equal parts using Gray code, in which case the angular resolution is 2 degrees.

[0043] The optical properties of the first sector 211 and the second sector 212 are configured differently. These optical properties can be, but are not limited to, reflective properties and light-transmitting properties. The specific limitations are related to the specific type of the photoelectric sensor 300.

[0044] For example, referring to Figure 1, in one application, the reflective properties of the first sector 211 and the second sector 212 are set differently, with the first sector 211 having better reflective properties than the second sector 212 as an example:

[0045] Specifically, both the first sector 211 and the second sector 212 may have a certain reflective ability to the same light, but their reflective abilities may differ in strength. In this case, the movable disk 200 may specifically include a transparent disk body and a reflective coating applied to the entire surface of the transparent disk body, wherein the reflective properties of the reflective coating applied to the first sector 211 and the reflective coating applied to the second sector 212 are set differently. Of course, the reflective coating can be applied to the transparent disk body using any process, such as screen printing, coating, inkjet printing, etc. The difference in reflective properties between the first sector 211 and the second sector 212 can be adjusted according to actual needs.

[0046] Alternatively, specifically, only the first sector 211 may have a certain reflective ability, while the second sector 212 has almost no reflective ability, for example, it may be completely transparent. In one embodiment, the movable disk 200 may specifically include a transparent disk body and a reflective coating applied to a portion of the disk surface of the transparent disk body. The disk surface coated with the reflective coating constitutes the first sector 211, and the remaining disk surface constitutes the second sector 212. In this case, the first sector 211 has a certain reflective ability thanks to the reflective coating. The second sector 212, however, is transparent like the transparent disk body and has virtually no reflective ability. Alternatively, in one embodiment, the movable disk 200 includes a reflective disc body, with a portion of the disk surface of the reflective disc body being hollowed out. The hollowed-out disk surface constitutes the second sector 212, and the remaining disk surface constitutes the first sector 211. In this case, the reflective disc body refers to a disk body with a certain reflective ability, which can be made entirely of reflective material, or it can be made by covering a transparent disk body with a reflective coating as described above. The first sector 211 has a certain reflective ability thanks to the reflective disc body. The second sector 212 is hollowed out and has virtually no reflective ability.

[0047] Correspondingly, the fixed disk 100 has a pair of transmitting elements 310 and receiving elements 320 on one axial side of the movable disk 200. These are located on the same side of the fixed disk 100, i.e., on the same side of the movable disk 200. The pair of transmitting elements 310 and receiving elements 320 are located within the orthographic projection area formed on the fixed disk 100 by the sector through which the movable disk passes. The receiving element 320 is used to receive the sensed light reflected back from the sector. Specifically, if the fixed disk 100 is defined to have a mounting position corresponding to each code track 210, the mounting position can be used to mount the photoelectric sensor 300, i.e., the pair of transmitting elements 310 and receiving elements 320. The mounting position has an axially projected mounting position area 220 on the movable disk 200. The area of ​​the mounting position projection area 220 is no larger than the area of ​​each sector.

[0048] When the first sector 211 moves past a photoelectric sensor 300, the emitting element 310 emits light towards it. Since the first sector 211 has a certain reflective ability, it can reflect the light emitted by the emitting element 310 back to the fixed disk 100, where it is received by the paired receiving elements 320, triggering the formation of the first sensing signal.

[0049] When the second sector 212 moves past a photoelectric sensor 300, the transmitting element 310 emits light towards it. If the second sector 212 has weak reflectivity, it can reflect the light emitted by the transmitting element 310 back to the fixed disk 100, where it is received by the paired receiving elements 320, triggering the formation of a second sensing signal. If the second sector 212 has virtually no reflectivity, the light emitted by the transmitting element 310 penetrates the second sector 212 and cannot be reflected back to the fixed disk 100, meaning it cannot be received by the paired receiving elements 320. In this case, the photoelectric sensor 300 triggers the formation of a third sensing signal. The first sensing signal and the second / third sensing signal all have differences, which facilitates the reception, storage, and analysis of the non-contact photoelectric encoder by data processing centers, for example.

[0050] Next, in practical applications, the paired transmitting components 310 and receiving components 320 are arranged at intervals along the circumference or tangential direction of the fixed disk 100. This ensures that the aforementioned mounting projection area 220 makes full use of the space of the corresponding sector in the circumferential or tangential direction, while minimizing excessive occupation of the radial space of the corresponding sector. In this way, on the limited surface of the movable disk 200, more code tracks 210 can be provided according to actual needs.

[0051] And / or referring to Figure 2, in one application, the light transmittance of the first sector 211 and the second sector 212 is set differently. For example, the light transmittance of the first sector 211 is weaker than that of the second sector 212:

[0052] Specifically, both the first sector 211 and the second sector 212 may have a certain light transmittance for the same light, but their light transmittance may differ in strength. For example, the movable disk 200 may include a transparent disk body and a light-shielding coating applied to the entire surface of the transparent disk body. The light transmittance of the light-shielding coating applied to the first sector 211 and the light-shielding coating applied to the second sector 212 may be different. Similarly, the light-shielding coating may be applied to the transparent disk body using any process, such as screen printing, coating, inkjet printing, etc. The area coated by the light-shielding coating generally has a certain degree of light blocking, that is, it weakens the light transmittance of that area. The difference in light transmittance between the first sector 211 and the second sector 212 can be adjusted according to actual needs.

[0053] Alternatively, specifically, only the first sector 211 may have a certain light-blocking capability, while the second sector 212 may be completely transparent. In this case, the movable disk 200 includes a transparent disk body and a light-blocking coating applied to a portion of the transparent disk body. The disk surface coated with the light-blocking coating constitutes the first sector 211, and the remaining disk surface constitutes the second sector 212. In this case, the first sector 211 has a certain degree of light blocking capability due to the light-blocking coating, and its light transmission capability is weakened. The second sector 212, on the other hand, is transparent like the transparent disk body and has virtually no light blocking capability. Alternatively, in one embodiment, the movable disk 200 includes a light-blocking disk body, with a portion of the disk surface of the light-blocking disk body being hollowed out. The hollowed-out disk surface constitutes the second sector 212, and the remaining disk surface constitutes the first sector 211. In this case, the light-blocking disk body refers to a disk body with a certain light-blocking capability, which can be made entirely of light-blocking material, or it can be made by covering a transparent disk body with a light-blocking coating as described above. The first sector 211 provides some light blocking through the optical disc. The second sector 212, however, is open and provides virtually no light blocking, allowing light to pass through.

[0054] Next, in practical application, two fixed disks 100 are provided, one on each side of the movable disk 200 along its axial direction, namely a first disk body 110 and a second disk body 120. The transmitting element 310 is located on the first disk body 110, within the projected area of ​​the sector it passes through. The receiving element 320 is located on the second disk body 120, within the projected area of ​​the sector it passes through. The receiving element 320 is used to receive the sensed light transmitted through the sector. Similarly, if the fixed disk 100 (including the first disk body 110 and the second disk body 120) has a mounting position corresponding to each code track 210, the mounting position can accommodate the photoelectric sensor 300, i.e., the paired transmitting element 310 and receiving element 320. The mounting position has an axially projected area 220 on the movable disk 200. Therefore, the area of ​​the mounting position projection area 220 is no larger than the area of ​​each sector.

[0055] When the first sector 211 moves past a photoelectric sensor 300, the emitting element 310 emits light towards it. Since the first sector 211 has a certain degree of light blocking, it can reflect the light emitted by the emitting element 310 back to the first disk 110, or it can be completely absorbed and cannot be received by the paired receiving elements 320 at the second disk 120. The photoelectric sensor 300 is then triggered to generate a first sensing signal.

[0056] When the second sector 212 moves past a photoelectric sensor 300, the transmitting element 310 emits light towards it. If the second sector 212 has weak light-blocking properties, it can reflect part of the light emitted by the transmitting element 310 back to the first disk 110 or absorb it, while the remaining light penetrates the second sector 212 and is received by the paired receiving elements 320 on the second disk 120, triggering the formation of a second sensing signal. If the second sector 212 has virtually no light-blocking properties, almost all the light emitted by the transmitting element 310 penetrates the second sector 212 and is received by the paired receiving elements 320 on the second disk 120. In this case, the photoelectric sensor 300 triggers the formation of a third sensing signal. The first sensing signal and the second / third sensing signal are all different, which facilitates the reception, storage, and analysis of non-contact photoelectric encoders, such as in data processing centers.

[0057] In practical applications, to improve the light receiving capability of the receiving element 320, the orthographic projection of the emitting surface of the paired emitting elements 310 onto the second disk 120 falls within the receiving surface of the receiving element 320. This means that within a limited space, the receiving surface of the receiving element 320 is made as large as possible to receive light that has passed through the sector but may be deflected due to refraction or other reasons.

[0058] Furthermore, the emitting surface of the aforementioned transmitting element 310 and / or the receiving surface of the receiving element 320 extend along a direction radially inclined relative to the fixed disk 100. It can be understood that when the emitting surface of the transmitting element 310 and / or the receiving surface of the receiving element 320 are inclined, the aforementioned mounting projection area 220 fully utilizes the circumferential or tangential space of the corresponding sector, while minimizing excessive occupation of the radial space of the corresponding sector. Thus, on the limited surface of the movable disk 200, more code tracks 210 can be provided according to actual needs, without substantially reducing the light transmission and reception quality of the photoelectric sensor 300.

[0059] Furthermore, based on one or more of the above embodiments, and referring to Figure 3, in one embodiment, the photoelectric sensors 300 are arranged sequentially along the same radial direction of the fixed disk 100, and the photoelectric sensors 300 are arranged sequentially and staggered along the circumference of the fixed disk 100. In this way, the installation of each photoelectric sensor 300 on the fixed disk 100 (first disk body 110 and second disk body 120) is kept as regular as possible, and the arrangement of each first sector 211 and second sector 212 is made simpler.

[0060] Alternatively, referring to Figure 4, the photoelectric sensors 300 are arranged in a staggered manner along the circumference of the fixed disk 100; each sector is encoded according to the arrangement of the photoelectric sensors 300. In this way, the installation of each photoelectric sensor 300 on the fixed disk 100 (first disk 110 and second disk 120) is staggered in the circumference, which helps to reserve enough space in the radial direction for the installation of each photoelectric sensor 300; on the other hand, it helps to fully separate each two adjacent photoelectric sensors 300, avoiding mutual interference between the sensing of each two adjacent photoelectric sensors 300.

[0061] Therefore, in a further embodiment, in the structure shown in Figure 4, when the photoelectric sensors 300 are arranged staggered along the circumference of the fixed disk 100, in order to ensure the initial position alignment of the non-contact photoelectric encoder, the first sector 211 and the second sector 212 on each code track 210 need to be circumferentially misaligned compared to the structure shown in Figure 3. Therefore, in one embodiment, the movable disk 200 may include a substrate and multiple annular plates disposed on the substrate. Each annular plate is arranged sequentially from the center of the substrate to its outer periphery, and each annular plate constitutes a code track 210. At this time, each annular plate can be rotated around the center of the substrate, having a rotating state and a locked state. The rotating state can be achieved by a preset power component; the locked state can be achieved by a locking structure. The locking structure can be, but is not limited to, an adsorption structure, a snap-fit ​​structure, etc. Thus, when the photoelectric sensors 300 are arbitrarily staggered along the circumference of the fixed disk 100, only the corresponding annular plates need to be rotated and adjusted.

[0062] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A non-contact photoelectric encoder, characterized in that, include: Fixed plate; A movable disk, coaxial with and spaced opposite to the fixed disk, is rotatable about its central axis. The movable disk has multiple rings of code tracks radially, and each code track has multiple sectors circumferentially. Each sector includes a first sector and a second sector encoded according to Gray code, and the optical properties of the first sector and the second sector are differentiated. Multiple photoelectric sensors are arranged on the fixed disk, one for each of the code tracks. Each photoelectric sensor includes a pair of transmitting and receiving elements. The transmitting element emits sensing light toward the sector that it moves through, and the receiving element receives the sensing light.

2. The non-contact photoelectric encoder as described in claim 1, characterized in that, The emitting surface of the emitting element and / or the receiving surface of the receiving element extend in a direction that is radially inclined relative to the fixed disk.

3. The non-contact photoelectric encoder as described in claim 1, characterized in that, The reflective properties of the first sector and the second sector are set differently; The fixed disk is provided on one side of the axial direction of the movable disk. The pair of transmitting and receiving components are both located on the fixed disk and are situated within the orthographic projection area formed by the sector that the movable disk passes through. The receiving component is used to receive the inductive light reflected back by the sector.

4. The non-contact photoelectric encoder as described in claim 3, characterized in that, The transmitting and receiving components, which are arranged in pairs, are spaced apart along the circumference or tangential direction of the fixed disk.

5. The non-contact photoelectric encoder as described in claim 3, characterized in that, The movable disk includes a transparent disk body and a reflective coating applied to the entire surface of the transparent disk body, wherein the reflective properties of the reflective coating applied to the first sector and the reflective coating applied to the second sector are configured to be different; or... The movable disk includes a transparent disk body and a reflective coating applied to a portion of the disk surface of the transparent disk body. The disk surface coated with the reflective coating constitutes the first sector, and the remaining disk surface constitutes the second sector; or... The movable disk includes a reflective disc body, a portion of which is hollowed out, forming the second sector, and the remaining portion forming the first sector.

6. The non-contact photoelectric encoder as described in claim 1, characterized in that, The light transmittance properties of the first sector and the second sector are set differently; The fixed disk is provided in two parts, which are respectively located on both sides of the axial direction of the movable disk, and are respectively a first disk body and a second disk body. The transmitting element is located on the first disk body and is located in the orthographic projection area of ​​the sector that the movable disk passes through on the first disk body. The receiving element is located on the second disk body and is located in the orthographic projection area of ​​the sector that the movable disk passes through on the second disk body. The receiving element is used to receive the sensed light transmitted through the sector.

7. The non-contact photoelectric encoder as described in claim 6, characterized in that, The orthographic projection of the transmitting surface of the paired transmitting elements onto the second disk body falls within the receiving surface of the receiving element.

8. The non-contact photoelectric encoder as described in claim 6, characterized in that, The movable disk includes a transparent disk body and a light-shielding coating applied to the entire surface of the transparent disk body. The light-shielding coating applied to the first sector and the light-shielding coating applied to the second sector have different light transmittance properties; or... The movable disk includes a transparent disk body and a light-shielding coating applied to a portion of the disk surface of the transparent disk body. The disk surface coated with the light-shielding coating constitutes the first sector, and the remaining disk surface constitutes the second sector; or... The movable disc includes a disc body with a partially open surface. The open surface of the disc body forms the second sector, and the remaining surface forms the first sector.

9. The non-contact photoelectric encoder as described in any one of claims 1 to 8, characterized in that, The photoelectric sensors are arranged sequentially along the same radial direction of the fixed disk; or, The photoelectric sensors are arranged in a staggered manner along the circumference of the fixed disk; Each sector is encoded according to the arrangement of each photoelectric sensor.

10. An angle measuring device, characterized in that, Including the non-contact photoelectric encoder as described in any one of claims 1 to 9.

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