Light emitting mechanism of stage lamp

Abstract

The utility model relates to the technical field of stage lamp, propose a stage lamp's light outlet mechanism, including installation base plate, multiple color LED array light source, light guide stick, rotation drive part, rotation swing arm, position inductor, sensing element, first lens and second lens, light guide stick is set up in installation base plate through fixed light guide stick seat, LED array light source sets up in the input of light guide stick, rotation drive part is fixedly set up in installation base plate, and rotation swing arm sets up in the output of rotation drive part, and rotation drive part drives rotation swing arm to rotate with the rotation center of rotation drive part, and sensing element is fixedly connected in rotation swing arm, position inductor sets up in installation base plate for inducting the position of sensing element, and first lens and second lens are arranged in the rotation department of rotation swing arm along the arc, the utility model discloses compact structure, significantly reduce the volume and weight, determine zero through position inductor, cooperate the position feedback of rotation drive part, effectively improve the precision of rotation swing arm movement angle.

Description

Technical Field

[0001] This utility model relates to the technical field of stage lighting, and in particular to a light-emitting mechanism for a stage lighting. Background Technology

[0002] In professional theater performances, concerts and music festivals, entertainment venue performances, and tourism performances, lighting, as a unique form of artistic expression, has become an important component of the artistic expression of performance activities. In these performances, a variety of stage lighting effects are often required, such as fogging effects to create a hazy feeling, and beam effects to illuminate sharp edges of light and shadow, etc., which are core optical effects for creating stage atmosphere. Previously, stage lights often had a fixed glass lens at the light outlet, projecting only one light effect and unable to project multi-color, multi-beam effects, resulting in limited functionality. Currently, some stage lights have structures with multiple glass lenses, rotating via motors, gears, and tracks to correspond to different display effects. However, this structure is not only complex and space-consuming, resulting in excessively large stage lights that are difficult to transport and handle. Furthermore, the lack of positioning during rotation, specifically the lack of positioning of the turntable, can easily lead to inconsistencies between the beam and the glass lens, affecting the lighting effect. Utility Model Content

[0003] To address the aforementioned shortcomings, the purpose of this utility model is to propose a light-emitting mechanism for a stage lamp, solving the problems of complex structure, large space occupation, and lack of position positioning in existing technologies.

[0004] To achieve this objective, the present invention adopts the following technical solution: A stage light emission mechanism includes a mounting base plate, a multi-color LED array light source, a light guide bar, a rotation drive, a rotation swing arm, a position sensor, a sensing element, a first lens, and a second lens. The light guide rod is mounted on the mounting substrate via a fixed light guide rod holder; the LED array light source is located at the input end of the light guide rod; The rotation drive is fixedly mounted on the mounting base plate, and the rotation swing arm is disposed at the output end of the rotation drive. The rotation drive drives the rotation swing arm to rotate around the rotation center of the rotation drive. The sensing element is fixedly connected to the rotating swing arm; The position sensor is disposed on the mounting substrate and is used to sense the position of the sensing element; The first lens and the second lens are arranged along an arc in the rotating part of the rotating arm.

[0005] Preferably, it further includes a positioning arm, one end of which is fixedly disposed on the rotating arm, and the other end of which extends outward in a direction away from the rotating arm, and the sensing element is disposed on the outwardly extending end of the positioning arm.

[0006] Preferably, the first lens and the second lens are arranged side by side on the rotating arm, and the position sensor is located below, above or to one side of the sensing element. When the rotating arm rotates and moves the sensing element to the position sensor, the sensing element triggers the position sensor, and the position sensor identifies the current position of the rotating arm.

[0007] Preferably, the sensing element is a positioning magnet, and the position sensor is a Hall sensor.

[0008] Preferably, the rotation drive is disposed on one side of the mounting base plate, the rotation swing arm is rotatably disposed on the other side of the mounting base plate, and the output end of the rotation drive passes through the mounting base plate and is connected to the rotation swing arm for transmission.

[0009] Preferably, the mounting base plate is provided with a limiting post, and one side of the rotating swing arm is provided with a limiting groove. During the rotation of the rotating swing arm, the limiting post can fall into the limiting groove, thereby limiting the rotation angle of the rotating swing arm.

[0010] Preferably, the openings of the limiting groove are provided with guide rounded corners at both ends.

[0011] Preferably, the limiting post is cylindrical, and the limiting groove is a circular groove with the same diameter as the limiting post.

[0012] Preferably, the rotating arm is provided with an effect light output hole, and the second lens is detachably disposed in the effect light output hole.

[0013] Preferably, the rotation drive is a servo motor or a stepper motor with a built-in encoder.

[0014] One of the above technical solutions has the following advantages or beneficial effects: 1. It replaces the traditional complex transmission system consisting of motors, gear sets, and tracks to rotate the heavy glass lens group. It adopts a direct drive mode with a simple combination of motor and rotating swing arm. The number of parts is greatly reduced and the transmission chain is extremely short, making the entire mechanism more compact and significantly reducing its size and weight. The smaller size and lighter weight allow as many effects as possible to be achieved in a small space, and the effect switching speed is fast. 2. Traditional structures lack effective positioning, which can easily lead to the optical center of the lens not coinciding with the beam axis, affecting the quality and brightness of the light spot. A position sensor is introduced to determine the "zero position" and, in conjunction with the position feedback of the rotation drive, form a high-precision positioning system. This improves the accuracy of the rotation arm's movement angle and ensures that the center of the second or first lens is accurately aligned with the center of the light outlet every time the lens is switched. This guarantees the integrity and consistency of the beam effect and avoids problems such as incomplete light spots and uneven brightness caused by misalignment. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a stage lamp with a light-emitting mechanism installed according to one embodiment of the present invention. Figure 2 yes Figure 1 A magnified view of a portion of the view; Figure 3 This is a perspective view of one embodiment of the present invention; Figure 4 This is an exploded view of one embodiment of the present invention; Figure 5 This is a schematic diagram of a rotating swing arm according to one embodiment of the present invention; The components include: mounting base plate 1, light outlet 11, limiting post 12, light guide rod 2, rotation drive component 3, rotation swing arm 4, limiting groove 41, guide rounded corner 42, effect light outlet hole 43, first lens 5, second lens 6, position sensor 7, sensing element 8, positioning swing arm 9, locking component 10, pressing end 101, and locking end 102. Detailed Implementation

[0016] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0017] In the description of this utility model, it should be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. Furthermore, features defined with "first" and "second" may explicitly or implicitly include one or more of these features, used to distinguish and describe features, without any order or emphasis.

[0018] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0019] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] The following is combined with Figures 1 to 5 This invention describes a stage light emitting mechanism according to an embodiment of the present invention, comprising a mounting base 1, a multi-color LED array light source, a light guide rod 2, a rotation drive 3, a rotation swing arm 4, a first lens 5, a second lens 6, a position sensor 7, and a sensing element 8; the first lens 5 can be a prism, a frosting sheet, a patterned sheet, or a color sheet, and the second lens 6 can also be a prism, a frosting sheet, a patterned sheet, or a color sheet. The light guide rod 2 can be a uniform light guide rod or a non-uniform light guide rod. A non-uniform light guide rod has a smaller light inlet area near the light source and a larger light outlet area away from the light source. The light guide rod 2 can be hollow glass, plastic, or other tubular structures with an internal reflective surface, or it can be a solid rod-shaped structure. It can be a prism with a cross-section of the same regular polygon or a prism with different cross-sections. A non-uniform light guide rod, such as... Figure 4 As shown, it is a square prism. It can also be a pentagonal prism, hexagonal prism, octagonal prism, etc. The light outlet can be a flat surface, a curved surface, or an irregular concave-convex surface.

[0021] The light guide rod 2 is mounted on the mounting substrate 1 via a fixed light guide rod seat; the LED array light source is located at the input end of the light guide rod 2; The rotation drive 3 is fixedly mounted on the mounting base 1 plate, and the rotation swing arm 4 is mounted on the output end of the rotation drive 3. The rotation drive 3 drives the rotation swing arm 4 to rotate around the rotation center of the rotation drive 3. The sensing element 8 is fixedly connected to the rotating swing arm 4; The position sensor 7 is disposed on the mounting substrate 1 and is used to sense the position of the sensing element 8; The first lens 5 and the second lens 6 are arranged along an arc on the rotating part of the rotating arm 4.

[0022] Furthermore, the middle part of the rotating swing arm 4 is connected to the rotating drive member 3 for transmission. The first lens 5 and the second lens 6 are disposed at one end of the rotating swing arm 4, and the other end of the rotating swing arm 4 is provided with the sensing element 8. The position sensor 7 is disposed below, above or on one side of the sensing element 8. When the rotating swing arm 4 rotates and drives the sensing element 8 to move to the sensing element 8, the sensing element 8 triggers the position sensor 7, and the position sensor 7 will identify the current position of the rotating swing arm 4.

[0023] The mounting substrate 1 is provided with a light outlet 11, which is located on the path of the first lens 5 and the second lens 6, and the light guide rod 2 is located below the light outlet 11.

[0024] In this embodiment, the first lens and the second lens are arranged side by side on the rotating arm, and the position sensor is located below the sensing element. When the rotating arm rotates and moves the sensing element above the position sensor, the sensing element triggers the position sensor, and the position sensor identifies the current position of the rotating arm.

[0025] Specifically, the sensing element 8 is installed at the other end of the rotating swing arm 4, and the position sensor 7 is fixedly installed on the mounting base plate 1. When the swing arm rotates to a specific position, causing the sensing element 8 to move to the position sensor 7, the sensor is triggered, and the system recognizes that the swing arm has reached the "zero position". By arranging the sensing element 8 and the position sensor 7 at the other end of the rotating swing arm 4, they are physically completely separated from the first lens 5, the second lens 6, and the driving end of the rotating drive component 3. The sensing process is completely independent of the optical elements and drive components, avoiding potential obstruction, friction, or interference to the optical path or transmission mechanism by the sensor and cables in a compact space. The concentration of the first lens 5 and the second lens 6 at one end of the rotating swing arm 4, while placing the sensing element 8 at the other end, helps to balance the rotational inertia of the swing arm, making the operation smoother. At the same time, the sensor is installed on an open base plate, which is beneficial for wiring and subsequent maintenance.

[0026] When the stage lights are turned on or a reset command is received, a "zeroing" operation is first performed: the rotation drive 3 is a servo motor or stepper motor with a built-in encoder. The rotation drive 3 drives the rotating arm 4 to slowly rotate closer to the position sensor 7. When the position sensor 7 senses the rotating arm 4, it triggers a signal to be sent to the control system. Upon receiving this signal, the control system sets the current position of the rotation drive 3 to a known "zero position". During the design phase, engineers will accurately measure how many angles need to be rotated from the "zero position" to accurately send the first lens 5 and each of the second lenses 6 into the optical path of the light outlet 11 in sequence. These angle data, such as first lens 5: +30°, second lens 61: +60°, second lens 62: +120°, etc., will be pre-stored in the "position mapping table" of the control system. During operation: When switching effects is required, the control system no longer needs the position sensor 7. The system queries the "position mapping table" for the angular coordinates corresponding to the target effect and sends a corresponding rotation angle command to the rotation drive 3. The rotation drive 3, relying on its own high-precision position feedback system, monitors the rotation angle of the output shaft in real time and forms a closed-loop control. It drives the swing arm to rotate and ensures that it stops precisely at the target angle with minimal error. This design allows the system to periodically or when a potential error is detected to re-execute the "zeroing" operation to eliminate errors accumulated due to factors such as long-term operation, slight slippage, or temperature changes, ensuring long-term operational accuracy.

[0027] The specific working principle of the light emission mechanism: The light emitted by the light source is integrated and conducted through the light guide rod 2 and emitted upward from the light outlet 11. The control system determines which beam effect needs to be presented according to the preset program or user instructions. The system sends the target angle instruction to the rotation drive 3. After receiving the instruction, the rotation drive 3 starts to work. The output shaft of the rotation drive 3 passes through the mounting base plate 1 and directly drives the rotating arm 4 to rotate and swing. The rotating arm 4 rotates at a preset angle so that the selected second lens 6 or the first lens 5 is exactly in the light path of the light outlet 11. If the second lens 6 is selected, the beam will pass through the pattern or color filter on the disk to form the corresponding pattern or colored light spot. The second lens 6 can be set with one, two or more, each corresponding to a different beam effect. If the first lens 5 is selected, the beam will be diffused to form a soft, foggy light effect. This application replaces the traditional complex transmission system consisting of a motor, gear set, and track to rotate the heavy glass lens group. It adopts a direct drive mode with a simple combination of motor and rotating arm 4, which greatly reduces the number of parts and the transmission chain, making the entire mechanism more compact and significantly reducing its size and weight. The smaller size and lighter weight make the stage lights more convenient in production, warehousing, logistics, and on-site setup, reducing costs and manpower requirements, while also reducing manufacturing costs and failure rates. The traditional structure lacks effective positioning, which can easily lead to the optical center of the lens not coinciding with the beam axis, affecting the quality and brightness of the light spot. The application introduces a position sensor 7 and a sensing element 8. The position sensor 7 and the sensing element 8 determine the "zero position" and, together with the position feedback of the rotating drive 3, form a high-precision positioning system. This improves the accuracy of the movement angle of the rotating arm 4, ensuring that the center of the second lens 6 or the first lens 5 is accurately aligned with the center of the light outlet 11 with each switch. This guarantees the integrity and consistency of the beam effect and avoids problems such as incomplete light spots and uneven brightness caused by misalignment.

[0028] Furthermore, it also includes a positioning swing arm 9, one end of which is fixedly disposed on the rotating swing arm 4, and the other end of which extends outward in a direction away from the rotating swing arm 4, and the sensing element 8 is disposed on the outwardly extending end of the positioning swing arm 9.

[0029] Specifically, a positioning arm 9 is installed at the end of the rotating arm 4. This is equivalent to adding another section to the original lever, which increases the lever arm from the rotation axis to the sensing element 8. When the rotating drive 3 rotates by a small angle, a larger linear displacement is generated at the end of the positioning arm 9. This allows the position sensor 7 to detect the zero position signal with extremely high sensitivity and clarity, which helps to improve the sensing accuracy of the sensing element 8 and the position sensor 7. After adding the positioning arm 9, it helps to balance the rotational inertia of the swing arms at both ends of the rotating drive 3, making the operation more stable.

[0030] Furthermore, the sensing element 8 is made of magnet, and the position sensor 7 is a Hall sensor.

[0031] Specifically, the combination of sensing element 8 and position sensor 7 can be a combination of a metal sheet and a proximity switch, or a combination of a magnet and a Hall sensor, etc. In this embodiment, sensing element 8 uses a magnet, and position sensor 7 uses a Hall sensor. A Hall sensor is a semiconductor device that works by detecting changes in a magnetic field. When a magnet (permanent magnet) approaches it, the Hall sensor outputs an electrical signal. If a physical contact sensor such as a microswitch is used, a mechanical collision will occur every time the swing arm returns to zero, resulting in wear and a limited lifespan. However, there is no physical contact between the Hall sensor and the magnet, so there is no wear or mechanical fatigue. This allows the lifespan of the sensing system to be theoretically the same as the natural lifespan of the element, and it can withstand hundreds of millions or even an infinite number of action cycles. This greatly improves the durability and reliability of stage lights that require frequent effect switching.

[0032] Furthermore, the rotation drive 3 is disposed on one side of the mounting base plate 1, and the rotation swing arm 4 is rotatably disposed on the other side of the mounting base plate 1. The output end of the rotation drive 3 passes through the mounting base plate 1 and is connected to the rotation swing arm 4 for transmission.

[0033] Furthermore, it also includes a locking member 10, which includes a pressing end 101 and a locking end 102. The pressing end 101 presses against the upper surface of the positioning swing arm 9, and the locking end 102 passes through the positioning swing arm 9 and the rotating swing arm 4 and is threadedly connected to the output end of the rotating drive member 3.

[0034] Specifically, the locking component 10 is typically a flanged screw used to rigidly connect the three moving parts—positioning swing arm 9, rotating swing arm 4, and the output shaft of the rotating drive component 3—into a single unit. Specifically, the pressing end 101 is the flange face of the screw, pressing down on the positioning swing arm 9; the locking end 102 is the threaded portion of the screw, passing downwards through the mounting holes of the positioning swing arm 9 and rotating swing arm 4, and finally tightening into the threaded hole at the center of the output shaft of the rotating drive component 3. This forms a "sandwich" structure, firmly locking the two swing arms onto the output shaft of the rotating drive component 3. This generates significant static friction between all connecting surfaces, completely eliminating any slight movement or wobbling in any direction, achieving true zero-backlash transmission. The relative positions of the two swing arms remain unchanged, further ensuring that after calibrating the zero position, the correspondence between the mechanical zero position and the optical element positions of the first lens 5 and the second lens 6 remains absolutely accurate throughout the entire lifespan of the equipment.

[0035] Furthermore, the mounting base plate 1 is provided with a limiting post 12, and one side of the rotating arm 4 is provided with a limiting groove 41. During the rotation of the rotating arm 4, the limiting post 12 can fall into the limiting groove 41, thereby limiting the rotation angle of the rotating arm 4.

[0036] Specifically, when the rotating arm 4 rotates to a certain boundary of its working range, the limiting groove 41 will rotate to the position of the limiting post 12. Under the action of the rotational force, the limiting post 12 will "fall" into the limiting groove 41. The two side walls of the limiting groove 41 will tightly lock the limiting post 12. Since the limiting post 12 is fixed, the limiting post 12 physically prevents the rotating arm 4 from continuing to rotate in that direction by blocking the movement of the groove wall. Although the control system and software will set the rotation range of the rotating drive 3, once a program error, signal interference or drive chip failure occurs, the rotating drive 3 may go out of control and turn beyond the design range. The mechanical limiting structure of the limiting post 12 and the limiting groove 41 constitutes the final safety guarantee. It can effectively prevent the rotating arm 4 from rotating excessively and hitting other precision parts, avoiding the breakage, deformation or permanent damage of the mechanical structure.

[0037] Furthermore, the opening ends of the limiting groove 41 are provided with guide radii 42.

[0038] Specifically, if the opening of the limiting groove 41 is a right angle, when the rotating arm 4 rotates to the limiting position, the limiting post 12 will have a violent, line-contact hard collision with the edge of the limiting groove 41, producing impact noise and vibration. Over time, this can easily lead to deformation of the limiting post 12 or the edge of the limiting groove 41. The rounded corner provides a gradually changing contact surface. When the limiting post 12 approaches the limiting groove 41, it will first contact the curved surface of the guide rounded corner 42. As the swing arm continues to rotate, the contact point smoothly transitions, eventually guiding the limiting post 12 to smoothly slide into the bottom of the limiting groove 41. This process greatly buffers the impact force, making the movement quiet and smooth. This greatly improves the contact fatigue strength and wear resistance of the two parts, the limiting post 12 and the limiting groove 41, thereby extending the service life of the entire limiting mechanism and even the rotating arm 4.

[0039] Furthermore, the limiting post 12 is cylindrical, and the limiting groove 41 is a circular groove with the same diameter as the limiting post 12.

[0040] Specifically, the fit between the cylinder and the groove ensures that when the limiting post 12 falls into the bottom of the groove, its positioning center is unique and definite. Each time the swing arm reaches the limiting position, its stopping angular position has extremely high consistency and repeatability. The fit between the cylinder and the groove also greatly reduces the pressure on the contact surface when the limiting post 12 falls into the bottom of the groove, thus improving the wear resistance of the parts and significantly extending their service life.

[0041] Furthermore, the rotating arm 4 is provided with an effect light output hole 43, and the second lens 6 is detachably disposed in the effect light output hole 43.

[0042] Specifically, the second lens 6 is detachably installed in the effect light output hole 43 and can be replaced. Different performances, plays, or events require specific patterns, and the effect lens 6 can be replaced and installed in the effect light output hole 43 to project different light effects. In the past, if a second lens 6 was damaged or a new pattern was needed, the entire second lens 6 module usually had to be replaced or even sent back to the factory for repair, which was costly and time-consuming. In this embodiment, if a single second lens 6 is damaged, the user only needs to replace that small, low-cost second lens 6 piece, without having to replace the entire swing arm or send it for repair, which greatly saves repair time and costs. When a new popular pattern appears, the user does not need to buy a new lamp; they only need to purchase a new second lens 6 at a very low cost to give the old lamp a new lease on life, which greatly extends the technical life cycle and commercial value of the stage lamp.

[0043] Furthermore, the rotation drive 3 is a servo motor or stepper motor with a built-in encoder.

[0044] Specifically, the encoder is a sensor used to detect the actual position and speed of the motor shaft. The built-in encoder can provide extremely high angular resolution, and the control system can control the motor to rotate by an extremely small angle. This micron-level control can ensure that the second lens 6 and the first lens 5 can be accurately and repeatedly positioned at the center of the light outlet 11, thereby ensuring the perfect presentation of the beam effect. The position sensor 7 provides an absolute position reference (zero position), and the built-in encoder provides high-precision relative position control. The combination of the two constitutes a complete and highly reliable positioning system with absolute coordinates and precise displacement.

[0045] For specific examples, the light-emitting mechanism has the following modes: 1. When the first lens is a frosting sheet, and the frosting sheet is cut into the front end of the light guide, it becomes a conventional lamp; 2. When the first lens is a frosting sheet, and the frosting sheet is cut out from the front end of the light guide, the effect sheet of the second lens is also cut out from the front end of the light guide at the same time. At this time, there is no lens at the front end of the light guide, and the effect is a small-angle flower. 3. When a prism is used as the second lens, and the second lens cuts into the front end of the light guide, a large-angle flower effect is achieved.

[0046] Other components and operations of the light-emitting mechanism of a stage lamp according to an embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0047] In this specification, the terms "embodiment," "example," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0048] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A light-emitting mechanism for a stage lamp, characterized in that: It includes a mounting base, a multi-color LED array light source, a light guide bar, a rotation drive, a rotation swing arm, a position sensor, a sensing element, a first lens, and a second lens; The light guide rod is mounted on the mounting substrate via a fixed light guide rod holder; the LED array light source is located at the input end of the light guide rod; The rotation drive is fixedly mounted on the mounting base plate, and the rotation swing arm is disposed at the output end of the rotation drive. The rotation drive drives the rotation swing arm to rotate around the rotation center of the rotation drive. The sensing element is fixedly connected to the rotating swing arm; The position sensor is disposed on the mounting substrate and is used to sense the position of the sensing element; The first lens and the second lens are arranged along an arc in the rotating part of the rotating arm.

2. The light-emitting mechanism of a stage lamp according to claim 1, characterized in that: It also includes a positioning swing arm, one end of which is fixedly disposed on the rotating swing arm, and the other end of which extends outward in a direction away from the rotating swing arm, and the sensing element is disposed on the outwardly extending end of the positioning swing arm.

3. The light-emitting mechanism of a stage lamp according to claim 2, characterized in that: The first lens and the second lens are arranged side by side on the rotating arm. The position sensor is located below, above or to one side of the sensing element. When the rotating arm rotates and moves the sensing element to the position sensor, the sensing element triggers the position sensor, and the position sensor identifies the current position of the rotating arm.

4. The light-emitting mechanism of a stage lamp according to any one of claims 2 or 3, characterized in that: The sensing element is a positioning magnet, and the position sensor is a Hall sensor.

5. The light-emitting mechanism of a stage lamp according to claim 4, characterized in that: The rotation drive is disposed on one side of the mounting base plate, and the rotation swing arm is rotatably disposed on the other side of the mounting base plate. The output end of the rotation drive passes through the mounting base plate and is connected to the rotation swing arm for transmission.

6. The light-emitting mechanism of a stage lamp according to claim 1, characterized in that: The mounting base plate is provided with a limiting post, and one side of the rotating arm is provided with a limiting groove. During the rotation of the rotating arm, the limiting post can fall into the limiting groove, thereby limiting the rotation angle of the rotating arm.

7. The light-emitting mechanism of a stage lamp according to claim 6, characterized in that: The openings of the limiting groove are provided with guide radii at both ends.

8. The light-emitting mechanism of a stage lamp according to claim 6, characterized in that: The limiting post is cylindrical, and the limiting groove is a circular groove with the same diameter as the limiting post.

9. The light-emitting mechanism of a stage lamp according to claim 1, characterized in that: The rotating arm is provided with an effect light output hole, and the second lens is detachably disposed in the effect light output hole.

10. The light-emitting mechanism of a stage lamp according to claim 1, characterized in that: The rotation drive is a servo motor or stepper motor with a built-in encoder.

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