Photoelectric encoder

Abstract

A photoelectric encoder relates to the technical field of encoders. The photoelectric encoder comprises an encoding part and a code reading part, the encoding part is arranged on a to-be-tested piece, and the encoding part comprises a plurality of light-transmitting areas and a plurality of light-proof areas which are alternately arranged in sequence; the code reading part comprises a photoelectric detector and at least one pulse light source, when the to-be-detected piece moves in the preset direction to drive the coding part to move, light emitted by the pulse light source can pass through a light-transmitting area and a light-proof area on the coding part, and the light passing through the light-transmitting area is received by the photoelectric detector and converted into photoelectric charges to be stored; the photoelectric encoder further comprises a signal processing circuit which is connected with the photoelectric detector. The signal processing circuit can output the photoelectric charges stored in the photoelectric detector within the light emitting interval of the pulse light source. According to the photoelectric encoder, the measurement precision and the measurement efficiency can be ensured in each measurement period, and the production cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to encoder technical field, specifically, relates to a photoelectric encoder. BACKGROUND

[0002] Encoder is a kind of physical quantity such as displacement, angle and so on is converted into digital signal or electrical signal device.It has wide application in automation control, robot technology, numerical control machine tool, motor control and many other fields, and can measure the relative displacement such as displacement, rotation angle of object.

[0003] Encoder is mainly composed of code disc or code ruler, light source and photoelectric detector.Light emitted by light source can illuminate code disc or code ruler, and photoelectric detector receives changed light signal and converts into electrical signal after light changes.However, the light source of the existing encoder is usually continuously illuminated in the whole measuring device, if the measuring time is longer, the signal of code reader will change within the measuring time, thereby error is generated, and the measurement accuracy is reduced;In order to reduce error, in high-precision encoder, many detector pixels are often used to read out signal, leading to long decoding time, and reducing measurement efficiency;And if detector pixels are too many, multiple parallel processing channels need to be set, thereby leading to complex circuit setting and high cost. SUMMARY

[0004] The utility model aims at providing a kind of photoelectric, can guarantee measurement accuracy and measurement efficiency within each measurement period.

[0005] The embodiment of the utility model is realized as follows:

[0006] One aspect of the utility model provides a kind of photoelectric encoder, including encoding part and code reading part, encoding part is set on the measured piece, and encoding part includes a plurality of light-transmitting regions and a plurality of non-light-transmitting regions that are sequentially and alternately arranged;Code reading part includes photoelectric detector and at least one pulsed light source, when the measured piece moves along the preset direction to drive encoding part to move, the light emitted by pulsed light source can pass through the light-transmitting region and the non-light-transmitting region on encoding part, and the light passing through the light-transmitting region is received by photoelectric detector and converted into photoelectric charge storage;Photoelectric encoder further includes signal processing circuit, and signal processing circuit is connected with photoelectric detector;Signal processing circuit can output the photoelectric charge stored by photoelectric detector within the light emitting interval of pulsed light source.

[0007] Optionally, the number of pulsed light sources is at least one;When the number of pulsed light sources is multiple, multiple pulsed light sources are uniformly distributed along the movement direction of measured piece, and the arrangement period of multiple pulsed light sources is equal to the arrangement period of the plurality of light-transmitting regions and the plurality of non-light-transmitting regions of encoding part;Multiple pulsed light sources emit light to generate multiple measurement signals respectively.

[0008] Optionally, the number of the pulsed light source is at least one; when the number of the pulsed light source is multiple, the multiple pulsed light sources are uniformly distributed along the movement direction of the measured member, and the arrangement period of the multiple pulsed light sources is different from the arrangement period of the multiple light-transmitting regions and the multiple light-blocking regions of the encoding portion by an integer number of periods.

[0009] Optionally, the photoelectric encoder further comprises a control portion connected with the pulsed light source, and the control portion is capable of adjusting the pulse period of the pulsed light source according to a preset signal.

[0010] Optionally, the encoding portion comprises a code disc, and the multiple light-transmitting regions and the multiple light-blocking regions are alternately arranged along the displacement direction of the code disc.

[0011] Optionally, the encoding portion comprises a code ruler, and the multiple light-transmitting regions and the multiple light-blocking regions are alternately arranged along the displacement direction of the code ruler.

[0012] Optionally, the pulsed light source is oppositely arranged with the photoelectric detector, and the encoding portion is arranged between the pulsed light source and the photoelectric detector, and the light emitted by the pulsed light source is received by the photoelectric detector after being transmitted through the light-transmitting region.

[0013] Optionally, the light transmission of the light-transmitting region changes by less than 10%.

[0014] Optionally, the pulsed light source and the photoelectric detector are arranged at intervals, and are both located on the side of the encoding portion away from the measured member, and the light emitted by the pulsed light source is received by the photoelectric detector after being reflected by the light-transmitting region.

[0015] Optionally, the light reflection of the light-transmitting region changes by less than 10%.

[0016] Optionally, the photoelectric encoder further comprises a time synchronization device, one end of the time synchronization device is connected with the signal processing circuit, and the other end is connected with an external device, and the external device is capable of synchronizing time with the signal processing circuit through the time synchronization device.

[0017] The beneficial effects of the present application include:

[0018] The application provides an optical-electric encoder, which comprises an encoding part and a code reading part. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of the drawings.

[0020] Figure 1 Fig. 1 is a structural schematic diagram of the optical-electric encoder provided by the present application;

[0021] Figure 2 Fig. 2 is another structural schematic diagram of the optical-electric encoder provided by the present application;

[0022] Figure 3 Fig. 3 is a third structural schematic diagram of the optical-electric encoder provided by the present application.

[0023] Fig. 1 is a structural schematic diagram of the optical-electric encoder provided by the present application; Fig. 2 is another structural schematic diagram of the optical-electric encoder provided by the present application; Fig. 3 is a third structural schematic diagram of the optical-electric encoder provided by the present application; Fig. 4 is a schematic diagram of the working principle of the optical-electric encoder provided by the present application; and Fig. 5 is a schematic diagram of the working principle of the optical-electric encoder provided by the present application. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0026] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0027] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, or the orientations or positional relationships commonly placed when the product of the present application is used, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third", etc. are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0028] In addition, the terms "horizontal", "vertical", etc. do not mean that the components must be absolutely horizontal or vertical, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0029] In the description of the present application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set", "mount", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] Please refer toFigure 1 and Figure 2 The embodiment provides an optical encoder 100, which comprises an encoding part 110 and a code reading part 120. The encoding part 110 is arranged on a measured object. The encoding part 110 comprises a plurality of light-transmitting regions 111 and a plurality of light-blocking regions 112 arranged alternately. The code reading part 120 comprises a photoelectric detector 122 and at least one pulse light source 121. When the measured object moves along a preset direction to drive the encoding part 110 to move, light emitted by the pulse light source 121 can pass through the light-transmitting regions 111 and the light-blocking regions 112 on the encoding part 110, and the light passing through the light-transmitting regions 111 is received by the photoelectric detector 122 and converted into photoelectric charges.

[0031] Specifically, the optical encoder 100 comprises the encoding part 110 and the code reading part 120. The encoding part 110 is arranged on a measured object. When the measured object moves along a preset direction, the encoding part 110 moves synchronously. In a specific embodiment of the application, the measured object is a rotating shaft of a motor, and the encoding part 110 is installed on the rotating shaft. Therefore, the encoding part 110 can instantaneously perceive and synchronously change the position corresponding to each rotation of the motor shaft.

[0032] As shown in FIGS. 1 and 2, the encoding part 110 comprises a plurality of light-transmitting regions 111 and a plurality of light-blocking regions 112 arranged alternately. The light-transmitting regions 111 can be in the shape of a sector, a rectangle or a trapezoid. With the movement of the encoding part 110 following the movement of the measured object, the light-transmitting regions 111 and the light-blocking regions 112 change alternately, forming a series of light signals with specific rules. The light signals can be recognized by the code reading part 120, and then converted into corresponding electrical signals, so as to realize accurate encoding and measurement of the position and speed of the measured object. Figure 1 and Figure 2 As shown in FIGS. 1 and 2, the encoding part 110 comprises a plurality of light-transmitting regions 111 and a plurality of light-blocking regions 112 arranged alternately. The light-transmitting regions 111 can be in the shape of a sector, a rectangle or a trapezoid. With the movement of the encoding part 110 following the movement of the measured object, the light-transmitting regions 111 and the light-blocking regions 112 change alternately, forming a series of light signals with specific rules. The light signals can be recognized by the code reading part 120, and then converted into corresponding electrical signals, so as to realize accurate encoding and measurement of the position and speed of the measured object.

[0033] The code reading part 120 is composed of the photoelectric detector 122 and at least one pulse light source 121. During the movement of the measured object along a preset direction to drive the encoding part 110 to move, the pulse light source 121 emits light at a set frequency. The light passes through the light-transmitting regions 111 and the light-blocking regions 112 on the encoding part 110 alternately.

[0034] The light emitting time of the pulse light source 121 is less than 100% duty cycle, so that the pulse light source 121 emits light intermittently. Each time the pulse light source 121 emits light, the light irradiates on the encoding part 110 to form a light signal, which is received by the photoelectric detector 122, so as to form a measurement cycle. Optionally, the light emitting time of the pulse light source 121 can be controlled to be less than 1 us.

[0035] Because the pulse time is short, and the error caused by the movement between the encoding part 110 and the code reading part 120 during the time when the photoelectric detector 122 reads the signal can be ignored, higher measurement accuracy can be obtained, and greater displacement speed is allowed.

[0036] The number of the pulse light source 121 is at least one. When the number of the pulse light source 121 is multiple, the multiple pulse light sources 121 are uniformly distributed along the movement direction of the measured member. Through such a setting mode, light can be emitted to the encoding part 110 from different positions, and more accurate position and rotation angle information of the code disc can be obtained by comprehensively processing the signals received by the pulse light sources 121 at different positions.

[0037] In a specific embodiment of the present application, when the number of the pulse light source 121 is multiple, the multiple pulse light sources 121 are uniformly distributed along the movement direction of the measured member, and the arrangement period of the multiple pulse light sources 121 is equal to the arrangement period of the multiple light-transmitting regions 111 and the multiple light-blocking regions 112 of the encoding part 110; the multiple pulse light sources 121 emit light to generate multiple measurement signals, which are used for signal redundancy or measurement of multiple code channels, so as to ensure that the signals of each pulse light source 121 do not interfere with each other; in another specific embodiment of the present application, the multiple pulse light sources 121 are uniformly distributed along the movement direction of the measured member, and the arrangement period of the multiple pulse light sources 121 is different from the arrangement period of the multiple light-transmitting regions 111 and the multiple light-blocking regions 112 of the encoding part 110 by an integer number of periods, so as to ensure that the signals do not cause phase interference after superposition, thereby ensuring the measurement accuracy.

[0038] The photoelectric detector 122 includes multiple pixels, and the light signal received by the photoelectric detector 122 accumulates photoelectric charges in each pixel of the detector array. The average displacement of the measured member during the light-emitting period of the pulse light source 121 is determined according to the signal difference read by the multiple pixels of the photoelectric detector 122, which further improves the measurement accuracy. After the pulse light source 121 is turned off, the photoelectric charge integration value in the pixel remains unchanged until the photoelectric charge integration value in the pixel is reset after reading out, so as to prepare for the photoelectric charge accumulation in the next measurement period. In this way, the measurement result of each measurement period can be more accurate, and the measurement error is further reduced.

[0039] It should be noted that, in an embodiment of the present application, first, the photoelectric encoder 100 further includes a signal processing circuit, which is connected with the photoelectric detector 122; the signal processing circuit can output the photoelectric charges stored by the photoelectric detector 122 within the light-emitting interval of the pulse light source 121.

[0040] Specifically, the signal processing circuit is connected with the photodetector 122, so that the signal processing circuit can directly obtain the signal generated and stored by the photodetector 122. During the light-emitting interval of the pulsed light source 121, the signal processing circuit can output the photoelectric charge stored by the photodetector 122.

[0041] In the working process of the photoelectric encoder 100, the pulsed light source 121 emits pulsed light according to a set rule, and there is an interval between two light-emitting times. The signal processing circuit utilizes the interval to process and output the photoelectric charge stored by the photodetector 122. This is because when the pulsed light source 121 emits light, the photodetector 122 mainly performs the conversion and storage of the optical signal to photoelectric charge. If the photoelectric charge is output at this time, it may be disturbed by the optical signal in the conversion process, resulting in inaccurate output signal. During the light-emitting interval of the pulsed light source 121, the photodetector 122 has completed the conversion and storage of the corresponding optical signal, and the signal processing circuit can accurately output these photoelectric charges in the form of a specific electrical signal. Thus, the measurement accuracy and efficiency are further improved.

[0042] Secondly, the photoelectric encoder 100 further comprises a control unit connected with the pulsed light source 121, and the control unit can adjust the pulse period of the pulsed light source 121 according to a preset signal.

[0043] Specifically, the control unit is connected with the pulsed light source 121 and can send various control instructions and signals to the pulsed light source 121, so as to ensure that the pulsed light source 121 operates according to the required working mode and performance requirements.

[0044] The control unit can be connected with an external device, and a user can drive the control unit to control the pulsed light source 121 through the external device. Through such a connection mode, the light-emitting frequency of the pulsed light source 121 and the measurement position data can be transmitted to the user synchronously. Moreover, the user can control the light-emitting frequency of the pulsed light source 121 through the control unit, or the pulsed light source 121 can emit light after a preset time delay after the user gives a light-emitting instruction. Through the setting of the control unit, the pulse period can be adjusted, and the performance of the photoelectric encoder 100 can be flexibly adjusted to meet different use requirements and improve the applicability and reliability of the photoelectric encoder 100 under various working conditions.

[0045] The present application divides each light-emitting time into a measurement period by the pulsed light source 121, and receives and converts the photoelectric charge of each measurement period by the photodetector 122, so as to greatly improve the measurement accuracy and reduce the measurement error. The above photoelectric encoder 100 can ensure the measurement accuracy and efficiency in each measurement period, and reduce the production cost.

[0046] In one specific embodiment of the present application, the encoding part 110 comprises a code disc, and a plurality of light-transmitting regions 111 and a plurality of light-blocking regions 112 are arranged alternately along the displacement direction of the code disc.

[0047] Specifically, the encoding part 110 can be a code disc, which has a circular structure. A plurality of light-transmitting regions 111 and a plurality of light-blocking regions 112 are arranged on the side surface of the code disc facing the pulsed light source 121 along the displacement direction. When the code disc moves in the circumferential direction relative to the pulsed light source 121, the light emitted by the pulsed light source 121 will pass through different light-transmitting and light-blocking regions 112, resulting in regular changes in the light signal.

[0048] The measured object transmits its circular motion to the code disc through certain connection methods, such as shaft connection or shaft coupling, so that the code disc rotates in the circumferential direction relative to the pulsed light source 121, ensuring that the circular motion of the measured object can be accurately reflected in the position change of the code disc relative to the pulsed light source 121, and then the photoelectric detector 122 can receive the corresponding light signal change to realize the measurement of the circular motion.

[0049] The measured object can be a rotating shaft of a motor or a rotating component of a mechanical transmission device, and the code disc and the optical encoder 100 can accurately measure and monitor the motion speed, motion angle, and rotation direction of the measured object, providing accurate data basis for subsequent automatic control, position detection, or speed feedback applications.

[0050] In another specific embodiment of the present application, the encoding part 110 comprises a code ruler, and a plurality of light-transmitting regions 111 and a plurality of light-blocking regions 112 are arranged alternately along the displacement direction of the code ruler.

[0051] Specifically, the encoding part 110 can be a code ruler, which has a long strip shape. The code ruler can be made of materials with certain rigidity and stability, such as metal or hard plastic, to ensure that it will not deform or shift during the measurement process, thereby affecting the accuracy of the measurement.

[0052] On the surface of the code ruler facing the pulsed light source 121, a plurality of light-transmitting regions 111 and a plurality of light-blocking regions 112 are distributed and arranged alternately along the horizontal direction. The arrangement along the horizontal direction allows these regions to pass through the light emitted by the pulsed light source 121 in turn when the code ruler moves in a straight line relative to the pulsed light source 121. Different combinations of light-transmitting and light-blocking regions 112 can represent different position information. In this way, when the code ruler moves in the horizontal direction, the light signal received by the photoelectric detector 122 will change according to a certain encoding rule, so that the position of the code ruler can be determined according to the change of the light signal, and the straight-line displacement of the measured object can be accurately measured.

[0053] When the measured object moves in the horizontal direction, it will transmit its linear motion to the ruler, so that the ruler produces relative displacement in the horizontal direction relative to the pulsed light source 121. In this way, the positions of the light-transmitting region 111 and the light-blocking region 112 on the ruler relative to the pulsed light source 121 will change, thereby causing the light emitted by the pulsed light source 121 to change in the case of passing through these regions, and ultimately being perceived by the photodetector 122, thereby realizing the measurement of linear displacement.

[0054] Optionally, as shown in Figure 2 , the pulsed light source 121 is arranged opposite the photodetector 122, which can ensure that the light propagates from the pulsed light source 121 towards the photodetector 122; the encoding part 110 is arranged between the pulsed light source 121 and the photodetector 122, so that the light emitted by the pulsed light source 121 must pass through the encoding part 110 during propagation; the light emitted by the pulsed light source 121 is transmitted through the light-transmitting region 111 and is received by the photodetector 122.

[0055] As shown in Figure 3 , the light-emitting side of the pulsed light source 121 can also be provided with a collimating lens 130, and the light emitted by the pulsed light source 121 can be collimated by the collimating lens 130 and then vertically incident on the encoding part 110, and then transmitted through the light-transmitting region 111 and received by the photodetector 122.

[0056] It should be noted that the light transmittance refers to the proportion of light that can pass through the light-transmitting region 111, and the change in light transmittance refers to the fluctuation in the ability of the light-transmitting region 111 to allow light to pass through at different times, under different environmental conditions, or at different stages of use. The light transmittance of the light-transmitting region 111 of the photoelectric encoder 100 according to the present application changes by less than 10%. If the light transmittance changes too much, it may cause a large deviation in the light signal received by the photodetector 122.

[0057] By controlling the change in light transmittance of the light-transmitting region 111 to be less than 10%, it can be ensured that the photoelectric encoder 100 can provide relatively stable and consistent light signals in various possible use scenarios and environments, thereby making the encoding and measurement based on these light signals more accurate and reliable, reducing the measurement error introduced by the performance fluctuation of the light-transmitting region 111, and improving the performance and measurement accuracy of the entire photoelectric encoder 100 system, providing a more stable signal basis for subsequent signal processing and measurement applications.

[0058] Optionally, as shown in Figure 1 , the pulsed light source 121 and the photodetector 122 are arranged apart from each other and on the same side of the encoding part 110, and by such an arrangement, the volume of the photoelectric encoder 100 can be reduced; the light emitted by the pulsed light source 121 is reflected by the light-transmitting region 111 and is received by the photodetector 122.

[0059] It should be noted that the light reflectivity refers to the ratio of the reflected light flux to the incident light flux when the light is irradiated to the surface of the light-transmitting region 111. In order to ensure the performance and measurement accuracy of the photoelectric encoder 100, the light reflectivity of the light-transmitting region 111 is required to be less than 10%. If the light reflectivity changes too much, the reflected light signal intensity received by the photoelectric detector 122 will fluctuate greatly, thereby affecting the accurate reading of the encoding information.

[0060] The application controls the light reflectivity of the light-transmitting region 111 within 10%, which can ensure the stability of the reflected light signal during the entire service life of the photoelectric encoder 100. By limiting the light reflectivity of the light-transmitting region 111 within such a small range, the reflected light signal received by the photoelectric detector 122 can have high consistency and reliability, the measurement error caused by the fluctuation of the light reflectivity is reduced, and the photoelectric encoder 100 can work stably under various conditions, thereby providing good optical conditions and signal basis for accurate measurement of the motion information of the measured object.

[0061] In an embodiment of the application, the photoelectric encoder 100 further comprises a time synchronization device, one end of the time synchronization device is connected with the signal processing circuit, and the other end is connected with an external device, and the external device can synchronize time with the signal processing circuit through the time synchronization device.

[0062] Specifically, the time synchronization device can be a separate module or a functional unit integrated in other components, and the main purpose is to manage and coordinate the time information in the system to solve the problems of inconsistent information or measurement error caused by the difference in time reference of different components in the working process of the photoelectric encoder 100.

[0063] One end of the time synchronization device is connected with the signal processing circuit, and the other end is connected with an external device. In actual working process, the external device can have its own time reference, but in order to ensure the cooperative work and accuracy of information processing of the entire system, it is required to reach an agreement with the signal processing circuit in the photoelectric encoder 100 in time. Through the time synchronization device, the external device can receive the time information from the signal processing circuit or other system components, and adjust its own time reference according to the information.

[0064] Optionally, the synchronization signal includes but is not limited to a hardware synchronization signal, a bit synchronization signal through a communication port, or a Network Time Protocol (NTP), an IEEE 1588 Precision Network Synchronization Protocol (PTP), etc.

[0065] Through the setting of the time synchronization device, data processing errors and operation errors caused by time deviation are avoided, the consistency and coordination of the whole system in time are ensured, and the accurate operation of the whole system is ensured.

[0066] The above only describes optional embodiments of the present application and is not intended to limit the present application.

[0067] In addition, it should be noted that various specific technical features described in the foregoing specific embodiments can be combined in any appropriate manner without contradiction, and in order to avoid unnecessary repetition, the present application will not further describe various possible combination manners.

Claims

1. An optical encoder, characterized by, The photoelectric encoder comprises an encoding part and a reading part, the encoding part is arranged on a measured object, and the encoding part comprises a plurality of light-transmitting regions and a plurality of light-blocking regions arranged alternately; the reading part comprises a photoelectric detector and at least one pulse light source; when the measured object moves along a preset direction to drive the encoding part to move, the light emitted by the pulse light source can pass through the light-transmitting regions and the light-blocking regions on the encoding part, the light passing through the light-transmitting regions is received by the photoelectric detector and converted into photoelectric charges; the photoelectric encoder further comprises a signal processing circuit, the signal processing circuit is connected with the photoelectric detector; the signal processing circuit can output the photoelectric charges stored in the photoelectric detector within the light-emitting interval of the pulse light source.

2. The optical encoder of claim 1, wherein, The number of the pulse light sources is at least one; when the number of the pulse light sources is multiple, the multiple pulse light sources are arranged at intervals along the movement direction of the measured object, and the arrangement period of the multiple pulse light sources is equal to the arrangement period of the multiple light-transmitting regions and the multiple light-blocking regions of the encoding part; the multiple pulse light sources emit light to generate multiple measurement signals respectively.

3. The optical encoder of claim 1, wherein, The number of the pulse light sources is at least one; when the number of the pulse light sources is multiple, the multiple pulse light sources are arranged at intervals along the movement direction of the measured object, and the arrangement period of the multiple pulse light sources is different from the arrangement period of the multiple light-transmitting regions and the multiple light-blocking regions of the encoding part by an integer number of periods.

4. The optical encoder of claim 1, wherein, The photoelectric encoder further comprises a control part, the control part is connected with the pulse light source, and the control part can adjust the pulse period of the pulse light source according to a preset signal.

5. The optical encoder of claim 1, wherein, The encoding part comprises a code disc, and the multiple light-transmitting regions and the multiple light-blocking regions are arranged alternately along the displacement direction of the code disc.

6. The optical encoder of claim 1, wherein, The encoding part comprises a code ruler, and the multiple light-transmitting regions and the multiple light-blocking regions are arranged alternately along the displacement direction of the code ruler.

7. The optical encoder of claim 1, wherein, The pulse light source is arranged opposite to the photoelectric detector, and the encoding part is arranged at intervals between the pulse light source and the photoelectric detector; the light emitted by the pulse light source is transmitted through the light-transmitting regions and then received by the photoelectric detector.

8. The optical encoder of claim 7, wherein, The light transmittance of the light-transmitting regions changes by less than 10%.

9. The optical encoder of claim 1, wherein, The pulse light source and the photoelectric detector are arranged at intervals, and both are located on the side of the encoding part away from the measured object; the light emitted by the pulse light source is reflected by the light-transmitting regions and then received by the photoelectric detector.

10. The optical encoder of claim 9, wherein, The light reflectance of the light-transmitting regions changes by less than 10%.

11. The optical encoder of claim 2, wherein, The photoelectric encoder further comprises a time synchronization device, one end of the time synchronization device is connected with the signal processing circuit, the other end is connected with an external device, and the external device can synchronize time with the signal processing circuit through the time synchronization device.

Images