Stage lamp capable of accurately detecting angle of effect disc

Abstract

The stage lamp capable of accurately detecting the angle of the effect disc comprises a control unit and a lamp holder, a light source generating light beams is arranged in the lamp holder, and the effect disc, a driving assembly and a position detection device with a sensing mechanism and a plurality of code marks are further arranged in the lamp holder. The coding marks are mutually arranged at certain intervals and are arranged on the effect disc in a surrounding manner; wherein each coding mark sequentially passes through the sensing mechanism in the rotating process of the effect disc, and the sensing mechanism generates an induction signal representing the real-time angle change of the effect disc and feeds back the induction signal to the control unit. According to the utility model, a control system of the stage lamp can monitor the working position of the effect disc in real time, so that the control system can correct the working position of the effect disc more accurately in the operation process of the stage lamp.

Description

Technical Field

[0001] The utility model relates to the technical field of stage lighting equipment, in particular to a stage lighting capable of accurately detecting the angle of an effect disk. Background Art

[0002] Stage lights are important equipment in stage performances. Their main function is to project light onto the stage. Their structure generally includes a base chassis, a support arm pivotally connected to the base chassis, and a lamp head pivotally connected to the support arm. The light source responsible for projecting light outward is installed in the lamp head. At the same time, to adapt to different application scenarios, designers will also add patterns and colorful effect disks inside the lamp to enable stage lights to display a variety of visual effects. To further enhance the liveliness of the stage, the effect disk is driven to rotate through a transmission mechanism to add dynamic elements. However, since stage lights are usually hung high on the stage, there is a certain distance between them and the projection target plane, it is also necessary to add lenses to the lamp to adjust the divergence angle of the light so that the light source of the lamp head can be projected to the target area at a distance.

[0003] However, since errors may occur in the motors, belts or effect disks inside the lamps during the processing and installation process, these errors will be amplified when the projection distance of the lens increases or its magnification becomes larger. When multiple lamps rotate the effect disks at the same time, the audience may intuitively see that the pattern positions of some lamps are offset, affecting the consistency of the stage effects. In order to overcome these errors, lamps on the market usually use Hall position sensors to calibrate the rotating effect disks. However, this type of device usually has only one sensor, so the effect disk needs to rotate one circle before its position can be read and fed back to the control unit for calibration. This method can only perform initial calibration at the beginning of the lamp turning on, or reset calibration before the lamp is turned off. It is difficult to achieve real-time monitoring of the position of the effect disk. The system lacks flexibility in identifying the position of the effect disk, so it is not convenient for the control system to calibrate the position of the effect disk in real time during the operation of the stage light. Utility Model Content

[0004] In order to solve the technical problems existing in the prior art to a certain extent as much as possible, the utility model provides a stage light that can accurately detect the angle of the effect disk, which can better help the control system of the stage light to monitor the working position of the effect disk in real time, so that the control system can more accurately correct the working position of the effect disk during the operation of the stage light.

[0005] The utility model discloses a stage light for accurately detecting the angle of an effect disk, comprising a control unit and a lamp head, wherein the lamp head is provided with a light source for generating a light beam, and further provided with:

[0006] an effect disk, located in the optical path of the light source and interfering with the light beam to produce a light effect;

[0007] A driving assembly is transmission-connected to the effect disk to drive the effect disk to rotate, and the effect disk has a plurality of stop positions for the interference light beams;

[0008] A position detection device having a sensing mechanism and a plurality of coding marks, wherein the coding marks are arranged around the effect disk at a certain interval; the sensing mechanism approaches the effect disk along the motion trajectory of the coding marks;

[0009] Wherein, each of the coding marks passes through the sensing mechanism in sequence during the rotation of the effect disk, and the sensing mechanism generates a sensing signal representing the real-time angle change of the effect disk and feeds it back to the control unit.

[0010] According to the utility model of a stage light for accurately detecting the angle of an effect disk, the position detection device is a magnetic encoder, an inductive encoder, or a capacitive encoder.

[0011] According to the utility model of a stage light for accurately detecting the angle of an effect disk, the position detection device is a photoelectric detector, and the sensing mechanism includes a light-emitting element and a photoelectric sensor;

[0012] In which, the light-emitting component projects continuous light onto the effect disk along the motion trajectory of each of the coding marks; each of the coding marks sequentially reflects the light emitted by the light-emitting component as the effect disk rotates to reflect it to the photoelectric sensor to form a sensing signal, and the control unit receives the sensing signal from the photoelectric sensor.

[0013] According to the utility model of a stage light for accurately detecting the angle of an effect disk, each of the coding marks is a reflective mark suitable for reflecting light;

[0014] The reflectivity between two adjacent reflective marks is smaller than the reflectivity of each reflective mark.

[0015] According to the utility model, a stage light that accurately detects the angle of an effect disk is provided, wherein the reflective mark is formed by applying aluminum oxide or a reflective nano-coating on the surface of the effect disk. During operation of the stage light, the interior of the lamp head is exposed to a high temperature environment, and the reflective mark made of these materials has good stability.

[0016] According to the utility model of a stage light for accurately detecting the angle of an effect disk, the photoelectric detector is an absolute photoelectric encoder.

[0017] According to the stage light for accurately detecting the angle of an effect disk of the utility model, the light-emitting element and the photoelectric sensor of the photoelectric detector are located on a side of the effect disk away from the light source.

[0018] According to a stage light for accurately detecting the angle of an effect disk of the utility model, the position detection device includes a photoelectric IC, and the signal emitting end and the signal receiving end of the position detection device are respectively set as the light emitting end and the light receiving end of the photoelectric IC; a control circuit for isolation protection is connected between the photoelectric IC and the control unit.

[0019] According to the stage light for accurately detecting the angle of the effect disk of the present invention, each of the coding marks is away from the rotation center of the effect disk and is arranged on the periphery of the effect disk.

[0020] According to the utility model of a stage light for accurately detecting the angle of an effect disk, the number of the coded marks arranged on the effect disk is 3600 to 7500, and the intervals between the coded marks are equal.

[0021] Preferably, the number of the coding marks arranged on the effect disk is 7200, and the spacing distances between the coding marks are equal.

[0022] According to the utility model, a stage light for accurately detecting the angle of an effect disk is provided. The driving assembly includes a motor, a driving gear, a driven gear, and a synchronous belt simultaneously sleeved on the driving gear and the driven gear. The driving gear is coaxially arranged on the power output shaft of the motor, and the driven gear is coaxially arranged on the rotating shaft of the effect disk.

[0023] According to the utility model, a stage light for accurately detecting the angle of an effect disk is provided. The effect disk is a fixed pattern disk, a rotating pattern disk, a fire disk, or a color disk.

[0024] According to the utility model, a stage light for accurately detecting the angle of an effect disk is provided, wherein the lamp head is further provided with a positioning magnet and a magnetic sensitive detector for detecting the positioning magnet, and a signal output end of the magnetic sensitive detector is connected to the control unit;

[0025] The positioning magnet is arranged on the effect disk and can rotate with the effect disk; the magnetic sensitive detector is located at the rotation starting position of the effect disk and detects the positioning magnet once during the process of the positioning magnet rotating one circle.

[0026] According to the utility model, a stage light for accurately detecting the angle of the effect disk is provided:

[0027] The position detection device is a magnetic encoder, and the sensing mechanism includes a signal sending end and a signal receiving end for sending magnetic field signals and receiving magnetic field signals respectively;

[0028] As the effect disk rotates, each of the coding marks passes through the signal emitting end of the position detection device in turn and changes the magnetic field signal strength emitted by the signal emitting end in turn to convert an induction signal; the signal receiving end of the position detection device receives the induction signal converted by each of the coding marks and feeds it back to the control unit.

[0029] Optionally, the sensing mechanism only includes a magnetically sensitive sensor, the coding mark is a magnet, and the magnetically sensitive sensor is used to sense magnets arranged in sequence and at intervals to generate an induction signal, which is finally fed back to the control unit.

[0030] According to the utility model, a stage light for accurately detecting the angle of the effect disk is provided:

[0031] The sensing mechanism includes a signal emitting end and a signal receiving end, and is used to emit current signals and receive current signals respectively;

[0032] As the effect disk rotates, each of the coding marks passes through the signal emitting end of the position detection device in turn and alternately changes the current signal intensity emitted by the signal emitting end to convert into a current pulse signal; the signal receiving end of the position detection device receives the current pulse signal converted by each of the coding marks and feeds it back to the control unit.

[0033] The utility model relates to a stage light for accurately detecting the angle of an effect disk. A sensing mechanism is added to the lamp head, and a plurality of coding marks are added to the effect disk, which are arranged at a certain interval and surround the effect disk. The sensing mechanism of the position detection device is close to the effect disk on the motion trajectory of each coding mark. When the stage light is working and the effect disk is driven to rotate by a driving component in the lamp head, each coding mark passes through the sensing mechanism in sequence during the rotation of the effect disk, so that the sensing mechanism generates a sensing signal representing the real-time angle change of the effect disk and feeds it back to the control unit MCU. The control unit MCU can calculate the rotation angle of the effect disk based on the number of times the sensing signal is generated. This can help the control system of the stage light to monitor the rotation position of the effect disk in real time. When it is detected that the effect disk is offset / moved, the control unit can promptly adjust and correct the rotation angle of the effect disk through the driving component to compensate or correct it. Therefore, the control unit can more accurately correct the working position of the effect disk during the operation of the stage light. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0035] Figure 1 This is the overall structure diagram of the stage light of the present utility model;

[0036] Figure 2 This is a partial exploded view of the internal structure of the lamp holder in the present utility model;

[0037] Figure 3 This is a partial structural diagram of the effect disk in the utility model;

[0038] Figure 4 This is a structural diagram of the effect disk in the present utility model;

[0039] Figure 5 It is a structural diagram of the control circuit in the present utility model.

[0040] Reference numerals:

[0041] 1. Bottom chassis, 2. Support arm, 3. Lamp head, 4. Light source, 5. Effect disk, 6. Position detection device, 7. Reflective mark, 71. Light-absorbing layer, 8. Positioning magnet, 9. Lens, 10. Motor, 11. Driving gear, 12. Driven gear, 13. Synchronous belt. DETAILED DESCRIPTION

[0042] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention. In the description of the present invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like, indicating positions or positional relationships, are based on the positions or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and are therefore not to be construed as limiting the present invention.

[0043] Example 1

[0044] like Figures 1 to 4 As shown, a stage light for accurately detecting the angle of an effect disk in this embodiment comprises a bottom chassis 1, a support arm 2 is pivotally connected to the bottom chassis 1, a lamp head 3 is pivotally connected to the support arm 2, a lens 9 is installed at the light outlet of the lamp head, a light source 4 and a control unit MCU are installed in the lamp head 3, and an effect disk 5, a driving component (not shown) and a position detection device 6 with a sensing mechanism and a plurality of coding marks are also installed. The effect disk 5 is located on the optical path of the light source 4 and between the lens 9 and the light source 4. The driving component is controlled by the control unit MCU in the lamp head, and the driving component is transmission-connected to the effect disk 5, so the control The control unit MCU can control the operation of the driving component and drive the effect disk 5 to rotate, and the effect disk 5 has a plurality of stop positions for the interference light beams; specifically, the driving component includes a motor 10, a driving gear 11, a driven gear 12, and a synchronous belt 13 that is simultaneously sleeved on the driving gear 11 and the driven gear 12. The driving gear 11 is coaxially arranged on the power output shaft of the motor 10, and the driven gear 12 is coaxially arranged on the rotating shaft of the effect disk 5. Therefore, when the control unit MCU starts the motor, the driven gear 12 can be synchronously driven to rotate through the synchronous belt 13. When the driven gear 12 rotates, it also synchronously drives the effect disk 5 to rotate. On the other hand, the sensing mechanism of the position detection device 6 is provided with a signal emitting end and a signal receiving end. The signal receiving end of the position detection device 6 is electrically connected to the control unit MCU to transmit a signal to the control unit MCU. In addition, a plurality of coding marks are distributed on the effect disk 5, each of which is spaced a certain distance apart and arranged around the effect disk 5. The signal emitting end and the signal receiving end of the sensing mechanism of the position detection device 6 are close to the effect disk 5 on the motion trajectory of each coding mark. When the stage light is working, the effect disk 5 rotates together with each coding mark. Each coding mark passes through the signal emitting end of the sensing mechanism in turn during the rotation of the effect disk 5. During this process, each coding mark changes the continuous signal of the signal emitting end of the sensing mechanism in turn, so that the sensing mechanism generates an induction signal representing the real-time angle change of the effect disk 5, and feeds it back to the control unit.

[0045] Optionally, the control unit MCU can be installed in the chassis 1 as needed.

[0046] It can be understood that the stage light of this embodiment adds a sensing mechanism in the lamp head 3 and adds a number of coding marks on the effect disk 5 that are spaced apart from each other and arranged around the effect disk 5, and the sensing mechanism of the position detection device 6 is close to the effect disk 5 on the motion trajectory of each coding mark. When the stage light is working and the effect disk 5 is driven to rotate by the driving component in the lamp head, each coding mark passes through the sensing mechanism in turn during the rotation of the effect disk 5, so that the sensing mechanism generates a sensing signal representing the real-time angle change of the effect disk 5 and feeds it back to the control unit MCU, so that the control unit MCU can convert the rotation angle of the effect disk 5 according to the number of times the sensing signal is generated. This can help the control system of the stage light to monitor the rotation position of the effect disk 5 in real time. When it is detected that the effect disk 5 is offset / moved, the control unit can adjust and correct the rotation angle of the effect disk 5 in time through the driving component, so that the control unit can more accurately correct the working position of the effect disk during the operation of the stage light.

[0047] Optionally, the position detection device 6 may be a magnetic encoder, an inductive encoder, or a capacitive encoder according to design requirements.

[0048] Specifically, the position detection device 6 is preferably a photoelectric detector, and the sensing mechanism includes a light-emitting element and a photoelectric sensor. In addition, correspondingly, each coded mark is a reflective mark 7, each reflective mark 7 is away from the rotation center of the effect disk 5 and is arranged on the periphery of the effect disk 5, and the surface of the reflective mark 7 is covered with aluminum oxide or a reflective nano-coating. These coating materials are resistant to high temperatures and have good reflective effects, so that the surface of the reflective mark 7 is suitable for reflecting light, and the reflectivity between two adjacent reflective marks 7 is less than the reflectivity of each reflective mark 7. The light-emitting element projects continuous light onto the effect disk 5 along the motion trajectory of each coded mark. Each coded mark sequentially reflects the light emitted by the light-emitting element during the rotation of the effect disk 5, thereby forming a sensing signal. The control unit is signal-connected to the photoelectric sensor to receive the generated sensing signal (wherein the generated sensing signal may be a pulse signal or a sine wave signal). That is to say, when the stage light is working and the effect disk 5 is driven to rotate by the driving component in the lamp head, each reflective mark 7 passes through the light-emitting part of the photodetector in turn as the effect disk 5 rotates and alternately changes the continuous light of the reflected light-emitting part, thereby converting the continuous light into a pulse light signal. At the same time, the photoelectric sensor of the photodetector receives the pulse light signal reflected by each reflective mark 7 and sends it to the photoelectric converter to form a pulse electrical signal, which is fed back to the control unit MCU through the formed pulse electrical signal, so that the control unit MCU can calculate the angle of the rotating effect disk 5 according to the pulse electrical signal and in combination with the algorithm to know the rotation position of the effect disk 5 in real time. When the control unit MCU detects that the position of the effect disk 5 is inaccurate and the pattern on the effect disk 5 is offset / moved in the above manner, the effect disk 5 can be compensated and corrected by software later to maintain the position accuracy of the effect disk 5 during operation.

[0049] In one embodiment, preferably, the light emitting element and the photoelectric sensor of the photoelectric detector are located on a side of the effect disk 5 away from the light source 4 to prevent strong light generated by the light source from entering the photoelectric sensor and affecting the detection accuracy of the photoelectric sensor.

[0050] In addition, in this embodiment, the signal emitting end and the signal receiving end of the position detection device 6 are located on the same side of the effect disk 5, that is, the light-emitting element and the photoelectric sensor of the photoelectric detector are located on the same side of the effect disk 5, so that while the light-emitting element projects light onto each reflective mark 7, the reflective mark 7 can simply and directly emit light to the photoelectric sensor of the photoelectric detector, ensuring the simplicity of the structure.

[0051] Optionally, the effect wheel 5 is a fixed pattern wheel (the fixed pattern wheel is not a fixed pattern wheel, but a plate surface is provided with a plurality of small pattern wheels that do not rotate) or a rotating pattern wheel or a fire wheel or a color plate.

[0052] Optionally, in order to ensure the detection accuracy of the photoelectric detector on the effect disk 5, the number of coding marks arranged on the effect disk 5 is 3600 to 7500. Specifically, in this embodiment, the number of coding marks arranged on the effect disk 5 is 7200, and the spacing distance between each coding mark is equal, which is equivalent to arranging 7200 reflective marks 7 evenly circumferentially on the effect disk 5, which can ensure the detection accuracy of the photoelectric detector on the effect disk 5.

[0053] Furthermore, in order to compensate for the fact that the photoelectric detector cannot realize the function of resetting the effect disk 5, a positioning magnet 8 and a magnetic sensitive detector (not shown) are further provided in the lamp holder 3. The magnetic sensitive detector is used to detect the positioning magnet 8, and the signal output end of the magnetic sensitive detector is connected to the control unit MCU so that the magnetic sensitive detector sends a signal to the control unit MCU. In addition, the positioning magnet 8 is fixed to the surface of the effect disk 5 and can rotate with the effect disk 5, and the magnetic sensitive detector is located at the rotation starting position of the effect disk 5, and the magnetic sensitive detector can detect the positioning magnet 8 once during the rotation of the positioning magnet 8. Through the above structure, when it is necessary to recalibrate the effect disk 5 and allow the effect disk 5 to be reset to the initial position, the magnetic sensitive detector can detect the positioning magnet 8 on the rotation path of the positioning magnet 8. During the rotation of the effect disk 5, when the magnetic sensitive detector detects the positioning magnet 8, the control unit MCU controls the effect disk 5 to stop rotating. At this time, the effect disk 5 can be reset, and the overall reset calibration of the effect disk is achieved, so that it is in the initial working position, which is more convenient to operate.

[0054] In one embodiment, specifically, the position detection device 6 includes a photoelectric IC, that is, the photoelectric detector in this embodiment is provided with a photoelectric IC, the signal emitting end and the signal receiving end of the position detection device 6 are respectively set as the light emitting end and the light receiving end of the photoelectric IC, and a control circuit is connected between the photoelectric IC and the control unit MCU in the lamp head. Figure 5As shown, U1 in the figure is a photoelectric IC, pins 1, 2, and 3 of the photoelectric IC are light-emitting ends, and pins 4, 5, and 6 are light-receiving ends. The control circuit includes transistors Q1, Q2 and inverters U2A and U2B. The collectors 2 of the transistors Q1 and Q2 are respectively connected to the power supply, and the emitters 3 of the transistors Q1 and Q2 are respectively grounded. The signal input pins 1 and 3 of the inverters U2A and U2B are respectively connected to the collectors 2 of the transistors Q1 and Q2, and the signal output pins 2 and 4 of the inverters U2A and U2B are respectively connected to the control unit MCU (not shown in the figure); the light receiving pins 5 and 4 of the photoelectric IC are respectively connected to the bases 1 of the transistors Q1 and Q2 so that the light receiving end of the photoelectric IC sends a level signal to the transistors Q1 and Q2 when receiving the light signal. In operation, when the photoelectric IC's light receiver receives reflected light, it turns on, and Q1 and Q2 also turn on. The +5V power supply is connected to Q2 via D2 and R1, and to Q1 via D1 and R4. When Q1 and Q2 are conducting, the 5V waveform is pulled low, and D1 and D2 flash. Conversely, when the photoelectric receiver detects no light and turns off, Q1 and Q2 are not conducting, maintaining a 5V voltage. Therefore, when the photoelectric IC detects light emitted by the reflective coating, a 0-5V pulse is generated. Software can use the number of pulses to determine the trip level. (R1, R4, R7, and R5 are current-limiting resistors, and R6 and R8 are pull-down resistors. U2 is an inverter for voltage inversion. It also isolates the photoelectric detector from the MCU, preventing photoelectric anomalies from causing MCU breakdown and providing protection.)

[0055] Example 2

[0056] This embodiment is similar to the first embodiment, except that Figure 3 As shown, the surface of the effect disk 5 is coated with a light-absorbing layer 71 between two adjacent reflective marks 7. The light-absorbing layer 71 is used to absorb most of the light from the light-emitting element, so that the difference in reflectivity between the portion between two adjacent reflective marks 7 and each reflective mark 7 is more obvious, which is conducive to allowing each reflective mark 7 to generate a more obvious pulse light signal during the rotation of the effect disk 5, thereby ensuring the detection accuracy of the photoelectric sensor.

[0057] The parts not mentioned in this embodiment are the same as those in the first embodiment and will not be described again here.

[0058] Example 3

[0059] The difference between this embodiment and the first embodiment is that the sensing mechanism of the position detection device 6 is a magnetic sensitive detector, and each coding mark is a magnet. Each coding mark passes through the magnetic sensitive detector alternately during the rotation of the effect disk 5, so that the magnetic sensitive detector detects the magnetic signal of each coding mark and feeds it back to the control unit. It is also convenient for the control unit MCU to calculate the rotation angle of the effect disk 5 according to the number of times the magnetic signal is generated, and monitor the rotation position of the effect disk 5.

[0060] Example 4

[0061] The difference between this embodiment and the first embodiment is that each of the coding marks passes through the sensing mechanism in sequence during the rotation of the effect disk 5. The sensing mechanism generates a current signal representing the real-time angle change of the effect disk 5 and feeds it back to the control unit. It is also convenient for the control unit MCU to calculate the rotation angle of the effect disk 5 according to the number of times the current signal is generated, and monitor the rotation position of the effect disk 5.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A stage light for accurately detecting the angle of an effect disk, comprising a control unit and a lamp head (3), wherein a light source (4) for generating a light beam is provided in the lamp head (3), characterized in that: The lamp holder (3) is further provided with: an effect disk (5) located on the optical path of the light source (4) and interfering with the light beam to produce a light effect; A driving assembly is transmission-connected to the effect disc (5) to drive the effect disc (5) to rotate, and the effect disc (5) has a plurality of stop positions for the interference light beams; A position detection device (6) having a sensing mechanism and a plurality of coding marks, wherein the coding marks are arranged at a certain interval and surround the effect disk (5); the sensing mechanism is close to the effect disk (5) on the movement trajectory of the coding marks; Wherein, each of the coding marks passes through the sensing mechanism in sequence during the rotation of the effect disc (5), and the sensing mechanism generates a sensing signal representing the real-time angle change of the effect disc (5) and feeds back to the control unit.

2. The stage light for accurately detecting the angle of the effect disk according to claim 1, characterized in that: The position detection device (6) is a magnetic encoder, an inductive encoder, or a capacitive encoder.

3. The stage light for accurately detecting the angle of the effect disk according to claim 1, characterized in that: The position detection device (6) is a photoelectric detector, and the sensing mechanism includes a light-emitting element and a photoelectric sensor; The light emitting element projects continuous light onto the effect disc (5) along the motion trajectory of each coding mark; each coding mark sequentially reflects the light emitted by the light emitting element as the effect disc (5) rotates, and the light is reflected to the photoelectric sensor to form a sensing signal; and the control unit receives the sensing signal from the photoelectric sensor.

4. The stage light for accurately detecting the angle of the effect disk according to claim 3, characterized in that: Each of the coding marks is a reflective mark (7) suitable for reflecting light; The reflectivity between two adjacent reflective marks (7) is smaller than the reflectivity of each reflective mark (7).

5. The stage light for accurately detecting the angle of the effect disk according to claim 4, characterized in that: The reflective mark (7) is formed by arranging aluminum oxide or a reflective nano coating on the surface of the effect disk (5).

6. The stage light for accurately detecting the angle of the effect disk according to claim 3, characterized in that: The photoelectric detector is an absolute photoelectric encoder.

7. The stage light for accurately detecting the angle of the effect disk according to claim 3, characterized in that: The light-emitting element and the photoelectric sensor of the photoelectric detector are located on a side of the effect disk (5) away from the light source (4).

8. The stage light for accurately detecting the angle of the effect disk according to claim 3, characterized in that: The position detection device (6) includes a photoelectric IC, and the signal emitting end and the signal receiving end of the position detection device (6) are respectively set as the light emitting end and the light receiving end of the photoelectric IC; a control circuit for isolation protection is connected between the photoelectric IC and the control unit.

9. The stage light for accurately detecting the angle of the effect disk according to claim 1, characterized in that: Each of the coding marks is away from the rotation center of the effect disk (5) and is arranged on the periphery of the effect disk (5).

10. The stage light for accurately detecting the angle of the effect disk according to claim 1, characterized in that: The number of the coding marks arranged on the effect disk (5) is 3600 to 7500, and the spacing distances between the coding marks are equal.

11. The stage light for accurately detecting the angle of the effect disk according to claim 1, characterized in that: The driving assembly comprises a motor (10), a driving gear (11), a driven gear (12), and a synchronous belt (13) which is sleeved on both the driving gear (11) and the driven gear (12); the driving gear (11) is coaxially arranged on the power output shaft of the motor (10), and the driven gear (12) is coaxially arranged on the rotating shaft of the effect disc (5).

12. The stage light for accurately detecting the angle of the effect disk according to claim 1, characterized in that: The effect disk (5) is a fixed pattern disk or a rotating pattern disk or a fire disk or a color disk.

13. The stage light for accurately detecting the angle of the effect disk according to claim 1, characterized in that: The lamp holder (3) is further provided with a positioning magnet (8) and a magnetic sensitive detector for detecting the positioning magnet (8), and a signal output end of the magnetic sensitive detector is connected to the control unit; The positioning magnet (8) is arranged on the effect disk (5) and can rotate with the effect disk (5); the magnetic sensitive detector is located at the rotation starting position of the effect disk (5) and detects the positioning magnet (8) once during the process of the positioning magnet (8) rotating one circle.

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