CN220490090U - Photoelectric encoder - Google Patents

Abstract

The application provides a photoelectric encoder, leading-in light source through the arc mouth, make light can export through n first light guide structures, and fourth teeth of a cogwheel and outside pivoted gear dock, under the drive of outside gear, make the second gear board rotate around round platform structure, and every rotatory a round of single tooth groove structure on the second gear board, just mesh once with double-deck gear's second teeth of teeth, drive double-deck gear and rotate one tooth, and double-deck gear's first teeth of a cogwheel also rotate, drive with it meshed first gear board rotates around breach cylinder, in first gear board's rotation, a plurality of first light transmission areas take place angular displacement, thereby make the light that n first light guide structures export can periodically see through first light transmission area, and first light transmission area is in the rotation in-process, whether have light to pass through in the first slit of decision n, be convenient for outside receiving element detects, thereby judge rotatory angle according to the result of detection.

Description

Photoelectric encoder

Technical Field

The application relates to the technical field of encoders, in particular to a photoelectric encoder.

Background

An encoder (encoder) is a device that compiles, converts, or converts a signal (e.g., a bit stream) or data into a signal form that can be used for communication, transmission, and storage. The encoder may convert or convert the angular displacement into an electrical signal, also known as a code wheel.

In the conventional encoder, the photoelectric encoder generally needs a one-to-one mode when designing the light source, that is, one light source corresponds to one hole, so as to realize detection of the signal photoelectric signal, but the mode consumes cost, which is not beneficial to popularization to various miniaturized and low-cost products.

Disclosure of Invention

An object of the embodiments of the present application is to provide an optoelectronic encoder, which reduces the manufacturing cost of the encoder.

In order to achieve the above object, embodiments of the present application are realized by:

in a first aspect, embodiments of the present application provide an optoelectronic encoder, including: the transparent light guide plate is provided with a notch circular center column at the center of the abdomen side, cylinders are arranged in the area of the abdomen side edges, n first light guide structures are arranged at equal angular intervals around the notch circular center column, the back side of the transparent light guide plate is covered with a shading layer, the side edges of the transparent light guide plate are provided with arc-shaped openings, and the sections except the arc-shaped openings are covered with the shading layer, wherein the arc-shaped openings are used for guiding light sources; the double-layer gear is provided with first gear teeth at a first height and second gear teeth at a second height, and a gear through hole is formed in the center of the double-layer gear; the first gear plate is provided with third gear teeth at the outer edge, a first through hole is formed in the center, and a plurality of first light transmission areas are formed around the first through hole; the slit cover plate is provided with a circular truncated cone structure in the central area, a notch circular groove is formed in the center of the circular truncated cone structure, and n first slits which are equiangular are formed in the edge area of the circular truncated cone structure; the center of the second gear plate is provided with a second through hole, the outer edge of the first level is provided with a single tooth slot structure, and the second level is provided with fourth gear teeth which are used for being in butt joint with an external rotating gear; the double-layer gear passes through the gear through hole and passes through the cylinder to be arranged on the abdomen side of the transparent light guide plate, the first gear plate passes through the first through hole and passes through the notch circular center column to be rotationally arranged on the abdomen side of the transparent light guide plate, so that the third gear teeth are meshed with the first gear teeth, the second gear plate passes through the second through hole and passes through the circular truncated cone structure to be rotationally arranged on the slit cover plate, the slit cover plate passes through the notch circular groove and is in butt joint with the notch circular center column, so that a single tooth slot structure on the second gear plate is meshed with the second gear teeth periodically, n first slits are positioned in the same annular range with n first light guide structures and a plurality of first light transmission areas, and n first slits are in one-to-one correspondence with n first light guide structures.

With reference to the first aspect, in a first possible implementation manner of the first aspect, a slot is provided inside the notch circular center column, and correspondingly, a slot is provided at a bottom of the notch circular groove, and the photoelectric encoder further includes a connecting piece, where two ends of the connecting piece are respectively inserted into the slot of the notch circular center column and the slot of the notch circular groove.

With reference to the first aspect, in a second possible implementation manner of the first aspect, n=5.

With reference to the second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the number of the first light-transmitting areas is 3, and a coverage angle range of each first light-transmitting area is different.

With reference to the third possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, the annular area where the plurality of first light-transmitting areas are located is equally divided into a first sub-area, a second sub-area and a third sub-area with a central angle of 120 °, where no first light-transmitting area exists in the first sub-area, one first light-transmitting area exists in the second sub-area, the first light-transmitting area is located in the second sub-area and occupies a central angle of 100 ° to 110 °, two first light-transmitting areas exist in the third sub-area, one first light-transmitting area occupies a central angle of 50 ° to 55 °, the other first light-transmitting area occupies a central angle of 25 ° to 27.5 °, and an interval between the two first light-transmitting areas is 37.5 ° to 45 °.

With reference to the first aspect, in a fifth possible implementation manner of the first aspect, a surface of each first light guiding structure facing a ventral side of the transparent light guiding plate is in a convex arc shape.

With reference to the first aspect, in a sixth possible implementation manner of the first aspect, an abdomen side of the transparent light guide plate is further provided with m second light guide structures, the m second light guide structures are disposed around the notch circular center column at equal angular intervals, and an annular area where the second light guide structures are located is not intersected with an annular area where the first light guide structures are located.

With reference to the sixth possible implementation manner of the first aspect, in a seventh possible implementation manner of the first aspect, the second gear plate opens a plurality of second light-transmitting areas around the second through holes on a plate surface of the second level.

With reference to the seventh possible implementation manner of the first aspect, in an eighth possible implementation manner of the first aspect, m second slits are disposed on a plate surface of the slit cover plate around the circular truncated cone structure at equal angles, where the m second slits and the m second light guiding structures, the plurality of second light transmitting areas are located in the same annular range, and the m second slits and the m second light guiding structures are in one-to-one correspondence.

The beneficial effects are that: 1. the double-layer gear passes through the cylinder through the gear through hole and sets up the ventral side at transparent light guide plate, first gear plate passes breach circle center post through first through hole and rotates the ventral side that sets up at transparent light guide plate, make third teeth of a cogwheel and first teeth of a cogwheel keep meshing, the second gear plate passes the round platform structure through the second through hole and rotates to set up on the slit apron, and the slit apron passes breach circular slot and breach circle center post butt joint, make the single tooth's socket structure on the second gear plate keep periodic engagement with the second teeth of a cogwheel, n first slits and n first light guide structures, a plurality of first printing opacity regions are located same annular scope. The light source is led in through the arc-shaped opening, light can be led out through n first light guide structures, the fourth gear teeth are in butt joint with an external rotating gear, the second gear plate is driven by the external gear to rotate around the circular truncated cone structure, each time the single tooth groove structure on the second gear plate rotates for one circle, the single tooth groove structure is meshed with the second gear teeth of the double-layer gear once, the double-layer gear is driven to rotate by one tooth, the first gear teeth of the double-layer gear are also rotated, the first gear plate meshed with the double-layer gear is further driven to rotate around the notch circular central column, in the rotation of the first gear plate, a plurality of first light transmission areas are subjected to angular displacement, so that the light led out by the n first light guide structures can periodically penetrate through the first light transmission areas, and the first light transmission areas are also in different positions where the first light transmission areas are located in the rotation process, whether light transmission exists in the n first slits or not is determined, and the external receiving units (namely the light detection modules) are convenient to detect according to detection results, and the rotation angles are judged. Therefore, the rotation angle detection with relatively high precision can be realized in a low-cost mode, and the rotation angle detection device is favorable for popularization to various miniaturized and low-cost products.

2. The inside slot that sets up of breach center column, the bottom of breach circular groove sets up the slot, utilizes the both ends of connecting piece to insert the slot of breach center column and the slot of breach circular groove respectively, stabilizes the connection between each part of photoelectric encoder. One surface of each first light guide structure facing the abdomen side of the transparent light guide plate is in a convex arc shape, so that light rays are conveniently concentrated and guided out.

3. The number of the first light guide structures and the corresponding first slits is 5, the number of the first light transmission areas is 3, and the coverage angle ranges of the first light transmission areas are different. Dividing the annular region where the plurality of first light transmission regions are located into a first subregion with a central angle of 120 degrees, a second subregion and a third subregion, wherein the first light transmission region does not exist in the first subregion, one first light transmission region exists in the second subregion, the first light transmission region is located in the second subregion and occupies a central angle of 100 degrees to 110 degrees (preferably 108 degrees), two first light transmission regions exist in the third subregion, one first light transmission region occupies a central angle of 50 degrees to 55 degrees (preferably 54 degrees), the other first light transmission region occupies a central angle of 25 degrees to 27.5 degrees (preferably 27 degrees), and the interval between the two first light transmission regions is 37.5 degrees to 45 degrees (preferably 39 degrees). By the design mode, the first light-transmitting areas in the second subarea can observe light rays of two adjacent first slits at most (the central angle between the two adjacent first light guide structures is 72 degrees) and at least one first slit, the first light-transmitting areas occupying 50-55 degrees of central angle in the third subarea can observe light rays of one first slit at most, the first slit can not be observed, the first light-transmitting areas occupying 37.5-45 degrees of central angle in the third subarea can observe light rays of one first slit at most, the first slit can not be observed, the three first light-transmitting areas are matched, the 4 first slit light rays can be observed at most, and at least 1 first slit light ray can be observed, so that the rotation angle can be calculated, and the precise positioning can be realized.

4. The abdomen side of the transparent light guide plate is also provided with m second light guide structures, the m second light guide structures are arranged at equal angular intervals around the notch circular center column, and the annular area where the second light guide structures are positioned is not intersected with the annular area where the first light guide structures are positioned. The second gear plate is provided with a plurality of second light transmission areas around the second through holes on the plate surface of the second layer. The surface of the slit cover plate is provided with m second slits which are arranged around the round platform structure at equal angles, wherein the m second slits, the m second light guide structures and the plurality of second light transmission areas are positioned in the same annular range, and the m second slits and the m second light guide structures are in one-to-one correspondence. In such a way, the existing components of the photoelectric encoder can be utilized for design, the angle measurement precision of the photoelectric encoder is further improved, more accurate angular displacement detection can be realized, and the additional cost is lower.

In order to make the above objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of the abdomen side of a transparent light guide plate of an optical-electrical encoder according to an embodiment of the present application.

Fig. 2 is a schematic diagram of a double-layer gear of an optical-electrical encoder according to an embodiment of the present application.

Fig. 3 is a schematic diagram of a first gear plate of an optoelectronic encoder according to an embodiment of the present disclosure.

Fig. 4 is a schematic diagram of a slit cover plate of an optical-electrical encoder according to an embodiment of the present application.

Fig. 5 is a schematic diagram of a second gear plate of the photoelectric encoder according to the embodiment of the present application.

Fig. 6 is a schematic diagram of the abdomen side of a transparent light guide plate of another photoelectric encoder according to the embodiment of the present application.

Fig. 7 is a schematic diagram of a slit cover plate of another photoelectric encoder according to an embodiment of the present application.

Fig. 8 is a schematic diagram of a second gear plate of another photoelectric encoder according to an embodiment of the present application.

Icon: 110-a transparent light guide plate; 111-a notched circular center column; 112-cylinder; 113-a first light guiding structure; 114-arc mouth; 115-a second light guiding structure; 120-double layer gear; 121-first gear teeth; 122-second gear teeth; 123-gear through holes; 130-a first gear plate; 131-third gear teeth; 132-a first through hole; 133-a first light-transmitting region; 140-slit cover plate; 141-notch circular grooves; 142-a first slit; 143-a second slit; 150-a second gear plate; 151-a second through hole; 152-single spline structure; 153-fourth gear teeth; 154-a second light-transmitting region; 160-slots.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.

In the description of the present application, it should be noted that, the azimuth or positional relationship indicated by the terms "inner", "outer", etc. are based on the azimuth or positional relationship shown in the drawings, or the azimuth or positional relationship that is commonly put when the product of the application is used, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and therefore should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

It should also be noted that the terms "disposed," "coupled," and "connected" are to be construed broadly, and may be, for example, fixedly coupled, detachably coupled, or integrally coupled, unless otherwise specifically defined and limited; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

Referring to fig. 1 to 5, fig. 1 to 5 are schematic diagrams of a transparent light guide plate 110, a double-layer gear 120, a first gear plate 130, a second gear plate 150, and a slit cover plate 140 of the photoelectric encoder, respectively.

In this embodiment, the transparent light guide plate 110 (as shown in fig. 1) of the photoelectric encoder is provided with a notched circular center column 111 at the central portion of the abdomen side, a column 112 is provided at the region of the abdomen side, n first light guide structures 113 are equiangular spaced around the notched circular center column 111 (n=5, which is only an example, and in other embodiments, a greater number of first light guide structures 113 can be designed according to the requirements and industrial conditions to improve the detection accuracy), the back side covers the light shielding layer, the side edge of the light guide plate is provided with an arc-shaped opening 114, and the portions except the arc-shaped opening 114 are covered with the light shielding layer, wherein the arc-shaped opening 114 is used for guiding a light source. The light-shielding layer may be a light-shielding paint, a light-shielding film, a light-shielding adhesive, or the like, and is not limited thereto. And a surface of each first light guide structure 113 facing the abdomen side of the transparent light guide plate 110 is designed as a convex arc shape, which plays a role of converging light.

The double-layer gear 120 (fig. 2) of the photoelectric encoder is provided with a first gear tooth 121 at a first height and a second gear tooth 122 at a second height, and the double-layer gear 120 is provided with a gear through hole 123 at the center. In this embodiment, the first gear teeth 121 and the second gear teeth 122 are each designed to be 8 teeth, and may be selected according to need in other embodiments, which is not limited herein.

The first gear plate 130 (as shown in fig. 3) of the photoelectric encoder has a third gear tooth 131 formed on an outer edge, a first through hole 132 formed in a center, and a plurality of first light-transmitting areas 133 formed around the first through hole 132. The number of the first light-transmitting regions 133 may be 3 (not limited to, and may be adjusted according to the number of the light-guiding structures and design requirements), and the coverage angle range of each first light-transmitting region 133 is different.

Specifically, the annular area where the plurality of first light-transmitting areas 133 are located is equally divided into a first sub-area, a second sub-area and a third sub-area with a central angle of 120 °, so that the first light-transmitting area 133 does not exist in the first sub-area, one first light-transmitting area 133 exists in the second sub-area and occupies a central angle of 100 ° -110 ° (preferably 108 °), two first light-transmitting areas 133 exist in the third sub-area, one first light-transmitting area 133 occupies a central angle of 50 ° -55 ° (preferably 54 °), the other first light-transmitting area 133 occupies a central angle of 25 ° -27.5 ° (preferably 27 °), and the two first light-transmitting areas 133 are spaced by 37.5 ° -45 ° (preferably 39 °).

Taking the example that the first light-transmitting area 133 of the second sub-area occupies a central angle of 108 ° and one first light-transmitting area 133 of the third sub-area occupies a central angle of 54 ° and the other first light-transmitting area 133 occupies a central angle of 27 °, the light-transmitting and light-impermeable portions in the annular area where the first light-transmitting area 133 is located are distributed as follows, with one end of the first light-transmitting area 133 of the second sub-area away from the third sub-area as a starting point: light-transmitting region 108 ° -light-opaque region 12 ° -light-transmitting region 27 ° -light-opaque region 39 ° -light-transmitting region 54 ° -light-opaque region 120 °.

The slit cover plate 140 (fig. 4) of the photoelectric encoder has a circular truncated cone structure in the central region, a notch circular groove 141 in the center of the circular truncated cone structure, and n first slits 142 arranged at equal angles in the edge region of the circular truncated cone structure.

A second gear plate 150 (as shown in fig. 5) of the photoelectric encoder is provided with a second through hole 151 in the center, a single tooth slot structure 152 is provided on the outer edge of the first level, and a fourth gear 153 is provided on the second level, wherein the fourth gear 153 is used for being in butt joint with an external rotating gear.

Based on this, the individual components of the photoelectric encoder are combined: the double-layer gear 120 is arranged on the abdomen side of the transparent light guide plate 110 by penetrating the cylinder 112 through the gear through hole 123, the first gear plate 130 is rotatably arranged on the abdomen side of the transparent light guide plate 110 by penetrating the notch circular central column 111 through the first through hole 132, the third gear 131 is meshed with the first gear teeth 121, the second gear plate 150 is rotatably arranged on the slit cover plate 140 by penetrating the circular truncated cone structure through the second through hole 151, the slit cover plate 140 is butted with the notch circular central column 111 by penetrating the notch circular groove 141, the single tooth groove structure 152 on the second gear plate 150 is periodically meshed with the second gear teeth 122, n first slits 142 are positioned in the same annular range with n first light guide structures 113 and a plurality of first light transmission areas 133, and n first slits 142 are in one-to-one correspondence with n first light guide structures 113.

The light source is led in through the arc-shaped opening 114, so that the light can be led out through n first light guide structures 113, the fourth gear teeth 153 are in butt joint with an external rotating gear, the second gear plate 150 rotates around the circular truncated cone structure under the driving of the external gear, and each time the single tooth groove structure 152 on the second gear plate 150 rotates around the circular truncated cone structure, the single tooth groove structure 152 is meshed with the second gear teeth 122 of the double-layer gear 120 once, the double-layer gear 120 is driven to rotate by one tooth, the first gear teeth 121 of the double-layer gear 120 also rotate, the meshed first gear plate 130 is further driven to rotate around the notch circular center column 111, in the rotation of the first gear plate 130, the first light transmission areas 133 are subjected to angular displacement, so that the light led out by the n first light guide structures 113 can periodically pass through the first light transmission areas 133, and in the rotation process of the first light transmission areas 133, whether light is transmitted out of n first slits 142 is determined due to different positions of the first light transmission areas 133, and the detection of an external receiving unit (namely a light detection module) is facilitated, and the detection is judged according to the detection result of the rotation angle.

And the slot 160 is disposed in the notch center column 111, and the slot 160 is disposed at the bottom of the corresponding notch center column 141, so that the photoelectric encoder may further include a connecting piece (e.g. a pin), where two ends of the connecting piece are inserted into the slot 160 of the notch center column 111 and the slot 160 of the notch center column 141, respectively.

In order to further improve the detection accuracy of the photoelectric encoder, the above components may be further designed, please refer to fig. 6 to 8, and fig. 6 to 8 are schematic diagrams of the transparent light guide plate 110, the second gear plate 150 and the slit cover plate 140 of the photoelectric encoder.

The abdomen side of the transparent light guide plate 110 is further provided with m second light guide structures 115, the m second light guide structures 115 are arranged around the notch circular center column 111 at equal angular intervals, and the annular area where the second light guide structures 115 are located and the annular area where the first light guide structures 113 are located are not intersected. The second gear plate 150 is provided with a plurality of second light-transmitting areas 154 around the second through holes 151 on the plate surface of the second level. The surface of the slit cover plate 140 is provided with m second slits 143 around the circular truncated cone structure at equal angles, wherein the m second slits 143, the m second light guide structures 115 and the plurality of second light transmission areas 154 are located in the same annular range, and the m second slits 143 and the m second light guide structures 115 are in one-to-one correspondence.

In the figure, the number of the m second slits 143 and the m second light guiding structures 115 is designed to be 7 (only for example), and the number of the second light transmitting regions 154 is designed to be 5 (only for example), so that the reading of the codes and the matching effect with the first light guiding structures 113, the first slits 142 and the light transmitting regions described above need to be considered in designing the light transmitting regions, and the design can be performed according to actual needs, which is not repeated here.

In summary, the embodiments of the present application provide an optoelectronic encoder:

1. the double-layer gear 120 is arranged on the abdomen side of the transparent light guide plate 110 by penetrating the cylinder 112 through the gear through hole 123, the first gear plate 130 is rotatably arranged on the abdomen side of the transparent light guide plate 110 by penetrating the notch circular central column 111 through the first through hole 132, the third gear 131 is meshed with the first gear teeth 121, the second gear plate 150 is rotatably arranged on the slit cover plate 140 by penetrating the circular truncated cone structure through the second through hole 151, the slit cover plate 140 is butted with the notch circular central column 111 through the notch circular groove 141, the single tooth groove structure 152 on the second gear plate 150 is periodically meshed with the second gear teeth 122, and the n first slits 142, the n first light guide structures 113 and the plurality of first light transmission areas 133 are positioned in the same annular range. The light source is led in through the arc-shaped opening 114, so that the light can be led out through n first light guide structures 113, the fourth gear teeth 153 are in butt joint with an external rotating gear, the second gear plate 150 rotates around the circular truncated cone structure under the driving of the external gear, and each time the single tooth groove structure 152 on the second gear plate 150 rotates around the circular truncated cone structure, the single tooth groove structure 152 is meshed with the second gear teeth 122 of the double-layer gear 120 once, the double-layer gear 120 is driven to rotate by one tooth, the first gear teeth 121 of the double-layer gear 120 also rotate, the meshed first gear plate 130 is further driven to rotate around the notch circular center column 111, in the rotation of the first gear plate 130, the first light transmission areas 133 are subjected to angular displacement, so that the light led out by the n first light guide structures 113 can periodically pass through the first light transmission areas 133, and in the rotation process of the first light transmission areas 133, whether light is transmitted out of n first slits 142 is determined due to different positions of the first light transmission areas 133, and the detection of an external receiving unit (namely a light detection module) is facilitated, and the detection is judged according to the detection result of the rotation angle. Therefore, the rotation angle detection with relatively high precision can be realized in a low-cost mode, and the rotation angle detection device is favorable for popularization to various miniaturized and low-cost products.

2. The slot 160 is arranged in the notch circular center column 111, the slot 160 is arranged at the bottom of the notch circular groove 141, and the two ends of the connecting piece are respectively inserted into the slot 160 of the notch circular center column 111 and the slot 160 of the notch circular groove 141 to stabilize the connection between all parts of the photoelectric encoder. The surface of each first light guiding structure 113 facing the abdomen side of the transparent light guiding plate 110 is in a convex arc shape, so that light rays are conveniently guided out in a concentrated manner.

3. The number of the first light guiding structures 113 and the corresponding first slits 142 is 5, the number of the first light transmitting regions 133 is 3, and the coverage angle ranges of each first light transmitting region 133 are different. The annular region where the plurality of first light transmitting regions 133 are located is equally divided into a first sub-region, a second sub-region and a third sub-region of 120 ° central angle, wherein the first light transmitting region 133 is absent in the first sub-region, one first light transmitting region 133 is present in the second sub-region, the first light transmitting region 133 is located in the second sub-region, the central angle of 100 ° to 110 ° (preferably 108 °), two first light transmitting regions 133 are present in the third sub-region, one first light transmitting region 133 occupies 50 ° to 55 ° (preferably 54 °), the other first light transmitting region 133 occupies 25 ° to 27.5 ° (preferably 27 °), and the interval between the two first light transmitting regions 133 is 32.5 ° to 35 ° (preferably 33 °). In this way, the first light-transmitting area 133 in the second sub-area can observe the light of at most two adjacent first slits 142 (the central angle between the two adjacent first light-guiding structures 113 is 72 °), and at least one light of the first slits 142 can be observed at most, while the first light-transmitting area 133 in the third sub-area occupies the central angle of 50 ° to 55 ° and at most one light of the first slits 142 can be observed at most, and may not observe the light of the first slits 142, while the first light-transmitting area 133 in the third sub-area occupies the central angle of 32.5 ° to 35 ° and at most one light of the first slits 142 can not be observed at most, and the three first light-transmitting areas 133 cooperate to observe the light of at most 4 first slits 142 and at least 1 light of the first slits 142 at most, thereby calculating the rotation angle, and thus the precise positioning.

4. The abdomen side of the transparent light guide plate 110 is further provided with m second light guide structures 115, the m second light guide structures 115 are arranged around the notch circular center column 111 at equal angular intervals, and the annular area where the second light guide structures 115 are located and the annular area where the first light guide structures 113 are located are not intersected. The second gear plate 150 is provided with a plurality of second light-transmitting areas 154 around the second through holes 151 on the plate surface of the second level. The surface of the slit cover plate 140 is provided with m second slits 143 around the circular truncated cone structure at equal angles, wherein the m second slits 143, the m second light guide structures 115 and the plurality of second light transmission areas 154 are located in the same annular range, and the m second slits 143 and the m second light guide structures 115 are in one-to-one correspondence. In such a way, the existing components of the photoelectric encoder can be utilized for design, the angle measurement precision of the photoelectric encoder is further improved, more accurate angular displacement detection can be realized, and the additional cost is lower.

The foregoing is merely exemplary embodiments of the present application and is not intended to limit the scope of the present application, and various modifications and variations may be suggested to one skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims (9)

1. An optoelectronic encoder, comprising:

the transparent light guide plate is provided with a notch circular center column at the center of the abdomen side, cylinders are arranged in the area of the abdomen side edges, n first light guide structures are arranged at equal angular intervals around the notch circular center column, the back side of the transparent light guide plate is covered with a shading layer, the side edges of the transparent light guide plate are provided with arc-shaped openings, and the sections except the arc-shaped openings are covered with the shading layer, wherein the arc-shaped openings are used for guiding light sources;

the double-layer gear is provided with first gear teeth at a first height and second gear teeth at a second height, and a gear through hole is formed in the center of the double-layer gear;

the first gear plate is provided with third gear teeth at the outer edge, a first through hole is formed in the center, and a plurality of first light transmission areas are formed around the first through hole;

the slit cover plate is provided with a circular truncated cone structure in the central area, a notch circular groove is formed in the center of the circular truncated cone structure, and n first slits which are equiangular are formed in the edge area of the circular truncated cone structure;

the center of the second gear plate is provided with a second through hole, the outer edge of the first level is provided with a single tooth slot structure, and the second level is provided with fourth gear teeth which are used for being in butt joint with an external rotating gear;

the double-layer gear passes through the gear through hole and passes through the cylinder to be arranged on the abdomen side of the transparent light guide plate, the first gear plate passes through the first through hole and passes through the notch circular center column to be rotationally arranged on the abdomen side of the transparent light guide plate, so that the third gear teeth are meshed with the first gear teeth, the second gear plate passes through the second through hole and passes through the circular truncated cone structure to be rotationally arranged on the slit cover plate, the slit cover plate passes through the notch circular groove and is in butt joint with the notch circular center column, so that a single tooth slot structure on the second gear plate is meshed with the second gear teeth periodically, n first slits are positioned in the same annular range with n first light guide structures and a plurality of first light transmission areas, and n first slits are in one-to-one correspondence with n first light guide structures.

2. The photoelectric encoder of claim 1, wherein the inside of the notched circular column is provided with a slot, and the bottom of the notched circular groove is provided with a slot, and the photoelectric encoder further comprises a connecting piece, and two ends of the connecting piece are respectively inserted into the slot of the notched circular column and the slot of the notched circular groove.

3. The photoelectric encoder of claim 1, wherein n = 5.

4. The optical-electrical encoder of claim 3, wherein the number of first light-transmitting regions is 3, and wherein the angular coverage of each first light-transmitting region is different.

5. The photoelectric encoder according to claim 4, wherein the annular area in which the plurality of first light transmitting areas are located is equally divided into a first sub-area, a second sub-area and a third sub-area with a central angle of 120 °, the first light transmitting area is absent in the first sub-area, one first light transmitting area is present in the second sub-area, the first light transmitting area is located in the second sub-area and occupies a central angle of 100 ° to 110 °, two first light transmitting areas are present in the third sub-area, one of the first light transmitting areas occupies a central angle of 50 ° to 55 °, the other first light transmitting area occupies a central angle of 25 ° to 27.5 °, and a space between the two first light transmitting areas is 37.5 ° to 45 °.

6. The optical-electrical encoder of claim 1, wherein a face of each of the first light guiding structures facing the ventral side of the transparent light guiding plate is in a convex arc shape.

7. The photoelectric encoder of claim 1, wherein m second light guide structures are further arranged on the abdomen side of the transparent light guide plate, the m second light guide structures are arranged around the notch circular center column at equal angular intervals, and an annular area where the second light guide structures are located is not intersected with an annular area where the first light guide structures are located.

8. The optoelectronic encoder of claim 7, wherein the second gear plate defines a plurality of second light transmissive regions on the second level of plate surface surrounding the second through holes.

9. The photoelectric encoder of claim 8, wherein m second slits are arranged on the plate surface of the slit cover plate around the truncated cone structure at equal angles, the m second slits and the m second light guide structures, the plurality of second light transmission areas are located in the same annular range, and the m second slits and the m second light guide structures are in one-to-one correspondence.