Optical system of LED stage spotlight and stage lamp

Abstract

The utility model discloses a kind of optical system and stage lamp of LED stage spotlight, including light path of emitting light. The light path of emitting light includes light source, light guide component, light mixing sheet and light emitting lens sequentially coaxially arranged along light emitting direction;Light guide component includes light guide stick and spotlight lens sequentially arranged along light emitting direction;The light entrance surface of light emitting lens is compound eye concave surface, and its light emitting surface is screw thread convex surface;Compound eye concave surface is plated with atomizing layer;It further include first drive unit, the first drive unit drives the light mixing sheet rotates along plane, to cut into or cut out the light path of emitting light. By optimizing Fresnel mirror and light guide stick design, and according to the light beam angle requirement dynamic adjustment light mixing intensity, solved the problem that any angle under color LED spotlight mixes color evenly, without color block chromatism, simultaneously significantly improved the light beam brightness of small angle, and compared with the brightness of spotlight of equivalent performance, increased by 40%-50%, and overall structure is simple, and practicality is strong.

Description

Technical Field

[0001] This utility model belongs to the field of lighting equipment technology, specifically relating to an optical system and stage lighting fixture for an LED stage spotlight. Background Technology

[0002] In the field of lighting equipment technology, colored light fixtures, with their rich and diverse color expression capabilities, are widely used in stage performances, commercial displays, film and television shooting, and many other scenarios, creating a highly engaging visual atmosphere for various events. Among these, the color mixing effect is one of the key performance indicators of colored light fixtures. An ideal color mixing effect requires that the projected light spot from any viewing angle achieves a uniform color mixing state, without obvious color blocks or differences. This ensures a natural and smooth color transition, providing viewers with a comfortable and high-quality visual experience.

[0003] Currently, most existing spotlight optical systems use Fresnel lenses as the light-emitting lenses. However, in color LED light mixing, relying solely on Fresnel lenses is insufficient to achieve ideal color mixing effects. To achieve uniform color mixing, existing technologies typically require the addition of a diffuser to the front end of the light guide. The diffuser scatters light, causing different colors to mix and thus achieving a more uniform color distribution. For example, Chinese Patent CN 208186009U discloses a stage lighting fixture with a novel optical system. This fixture includes several light-emitting units, each comprising a light source, a light guide, a diffuser, and a lens. The light guide receives and mixes the light emitted from the light source, and the diffuser is fixedly mounted on the mounting portion at the light-emitting end of the light guide.

[0004] While the aforementioned existing technologies can achieve uniform light mixing by adding atomizing sheets, they still have significant drawbacks in practical applications: there is a contradiction between the color mixing effect and the transmittance of the atomizing sheet during light mixing. When the atomization degree of the atomizing sheet is high, its scattering effect on light is stronger, the mixing between different colors of light is more complete, and the color mixing effect is better. However, at the same time, the transmittance of the atomizing sheet will be significantly reduced. This means that the amount of effective light that can penetrate and continue to propagate after being scattered by the atomizing sheet is greatly reduced, resulting in a significant decrease in the brightness of the lamp. In scenarios requiring high-brightness lighting, such as large-scale stage performances and outdoor advertising lighting, these lamps will struggle to meet the high brightness requirements of spotlights. Summary of the Invention

[0005] To address the problems in related technologies, this utility model proposes an optical system and stage lighting fixture for an LED stage spotlight, overcoming the aforementioned technical issues in existing related technologies. By optimizing the design of the Fresnel lens and light guide rod, and dynamically adjusting the mixing intensity according to the beam angle requirements, this utility model solves the problem of uniform color mixing and no color difference at any angle in a colored LED spotlight. At the same time, it significantly improves the beam brightness at small angles, and the brightness is 40%-50% higher than that of spotlights with equivalent performance.

[0006] The technical solution of this utility model is implemented as follows: An optical system for an LED stage spotlight includes a light-emitting optical path, which includes a light source, a light guide assembly, a light mixing plate, and a light-emitting lens arranged coaxially along the light-emitting direction; the light guide assembly includes a light guide rod and a condensing lens arranged sequentially along the light-emitting direction, and a housing is fitted around the light guide rod and the condensing lens, with the light-emitting surface of the condensing lens protruding from one end of the housing; the other end of the housing is connected to a mounting bracket; one end of the light guide rod is connected to the mounting bracket. The light-emitting lens has a compound eye concave surface for its light-incident surface and a threaded convex surface for its light-emitting surface. It also includes a first driving unit, which drives the light mixing plate to rotate along the plane to cut into or out of the light output path; Furthermore, the first driving unit drives the light mixing plate to rotate clockwise or counterclockwise to cut into or out of the light output path; or, The first driving unit drives the light mixing plate to rotate in a counterclockwise or clockwise direction to cut into or out of the light output path.

[0007] Furthermore, it also includes a support frame, a heat dissipation component, and a zoom component. The bottom of the support frame is provided with a slider, and the zoom component is provided with a guide rail. The slider is slidably connected to the guide rail. The heat dissipation component, the light guide component, the light mixing sheet, and the first driving unit are all integrated on the support frame. The change in the distance the slider moves on the guide rail corresponds to the zoom distance from the light guide assembly to the light-emitting lens; The zoom assembly includes a second drive unit, which drives the support frame as a whole to reciprocate in a direction closer to or further away from the light-emitting lens, so as to shorten or lengthen the zoom distance. Furthermore, the zoom distance corresponds to different zoom channel values; The zoom component includes a first zoom channel value and a second zoom channel value, and the value of each zoom channel value is in the range of 0-255, wherein the first zoom channel value is less than the second zoom channel value.

[0008] Furthermore, it also includes a central processing unit (CPU) and a position feedback unit, the position feedback unit being connected to the CPU, and the CPU being communicatively connected to an external console. The position feedback device is used to locate different zoom distances in order to obtain the corresponding real-time zoom channel value; Preferably, the position feedback device is a Hall sensor or a position switch; Furthermore, the console is a DMX console, which communicates with the central processing unit via the DMX control protocol and controls the stage lighting in the form of digital signals; the console includes multiple control channels, one of which has a zoom channel value of 0-255; the central processing unit is equipped with a storage unit and control software, and the storage unit is used to store the control channel and zoom channel values.

[0009] Furthermore, the second drive unit includes a zoom motor plate and two sets of drive components arranged in parallel; each drive component includes a lead screw motor, a motor lead screw, and a lead screw flange; one end of the motor lead screw passes through the center of the lead screw flange and is connected to the output shaft of the lead screw motor; the other end of the motor lead screw is provided with a zoom limit block; the zoom motor plate is used to fix the two lead screw motors; The lead screw motor is connected to the central processing unit.

[0010] Furthermore, the light output path includes a first beam angle value and a second beam angle value, wherein the first beam angle value is smaller than the second beam angle value; the range of each beam angle value is 12°-20°; Furthermore, in this invention, the first beam angle is preferably 12°, and the second beam angle is preferably 20°. The first driving unit includes an atomizing motor, an atomizing flange, and an atomizing adhesive plate. The light mixing plate is disposed at one end of the atomizing adhesive plate, and the other end of the atomizing adhesive plate is connected to the drive shaft of the atomizing motor. The atomizing motor drives the atomizing adhesive plate to rotate, thereby causing the light mixing plate to enter or exit the light output path. The atomizing motor is connected to the central processing unit.

[0011] Furthermore, the support frame is provided with an atomizing motor plate, which is used to fix the first driving unit; the atomizing motor plate is provided with a light-transmitting hole, which is located on the same optical axis as the light guide component; The drive shaft of the atomizing motor passes through the atomizing motor plate and the atomizing adhesive plate in sequence, and is connected to the atomizing flange; The atomizing adhesive plate is provided with a rotating positioning groove and a limiting post. The rotating positioning groove includes a first end and a second end that are arranged opposite to each other. The limiting post is used to abut against the first end or the second end. Furthermore, the opening of the rotary positioning groove is arc-shaped; It should be noted that: when the measured beam angle value of the output optical path does not exceed the first beam angle value, the real-time zoom channel value is set to not exceed the first zoom channel value; when the measured beam angle value is between the first beam angle value and the second beam angle value, the real-time zoom channel value is set to be between the first zoom channel value and the second zoom channel value; when the measured beam angle value exceeds the second beam angle value, the real-time zoom channel value is set to exceed the second zoom channel value. When the real-time zoom channel value obtained by the position feedback device does not exceed the first zoom channel value, the limiting post abuts against the first end, and the light mixing sheet does not enter the light output path; when the real-time zoom channel value is between the first zoom channel value and the second zoom channel value, the atomizing motor drives the atomizing adhesive plate to rotate, and the light mixing sheet begins to rotate and enter the light output path until the limiting post abuts against the second end; when the real-time zoom channel value exceeds the second zoom channel value, the limiting post remains abutting against the second end, and the light mixing sheet remains in the state of being entered into the light output path. It should be noted that in the process of setting the corresponding zoom channel value through the beam angle value, this utility model can verify the measured beam angle value through a beam angle measuring instrument.

[0012] Furthermore, when the support frame zooms in the reverse direction, the same zooming process described above is followed, as follows: When the real-time zoom channel value obtained by the position feedback device exceeds the second zoom channel value, the limiting post remains in contact with the second end, and the light mixing plate remains in the state of being cut into the light output path; when the real-time zoom channel value is between the first zoom channel value and the second zoom channel value, the atomizing motor drives the atomizing adhesive plate to rotate in the opposite direction, and the light mixing plate begins to rotate and cut out the light output path until the limiting post abuts with the first end; when the real-time zoom channel value does not exceed the first zoom channel value, the limiting post remains in contact with the first end, and the light mixing plate remains cut out of the light output path.

[0013] Furthermore, the heat dissipation component includes a heat sink assembly and a cooling fan. The heat sink assembly is disposed on the side of the light source that does not emit light, and the cooling fan is disposed at the bottom of the heat sink assembly. The light source is an LED lamp bead board. Furthermore, the LED bead board is a multi-color COB light source, which includes red, green, blue, amber, and grass green; or, The LED light bead board is a mixed warm and cool light source.

[0014] Furthermore, the light-mixing sheet is an atomizing sheet, which is made of frosted glass; the transmittance of the atomizing sheet is 65%. The light-emitting lens is a Fresnel lens, which is made of glass. The concave surface of the compound eye is coated with a fogging layer, and the fogging degree of the fogging layer is 4°-6°, preferably 5° in this embodiment. The fogging degree of the fogging layer is lower than that of the fogging sheet.

[0015] Furthermore, the mounting bracket is provided with a limiting groove; one end of the light guide rod passes through the limiting groove and engages with the inner wall of the limiting groove; an air gap is left between the light guide rod and the condensing lens; The cross-sectional shape of one end of the light guide rod is a regular octagon, and the cross-sectional shape of the other end of the light guide rod is a circle. Furthermore, one end of the light guide rod, which is octagonal, passes through the limiting groove.

[0016] A stage lighting fixture includes a spotlight head having an optical system as described above.

[0017] The beneficial effects of this utility model are: This invention solves the problem of uniform color mixing and no color difference at any angle in colored LED spotlights by optimizing the design of the Fresnel lens and light guide rod, and dynamically adjusting the mixing intensity according to the beam angle requirements. At the same time, it significantly improves the beam brightness at small angles, and the brightness is 40%-50% higher than that of spotlights with equivalent performance. The entire optical system has a simple structure and is easy to manufacture and maintain. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the optical system of this utility model; Figure 2 This is a schematic diagram of the optical system of this utility model from another angle; Figure 3 This is a schematic diagram of the zoom component and support frame of this utility model separated; Figure 4 This is a bottom view showing that the heat dissipation component, light guide component, light mixing sheet and first drive unit of this utility model are all integrated on the support frame; Figure 5 The side view shows that the heat dissipation component, light guide component, light mixing sheet and the first driving unit of this utility model are all integrated on the support frame; Figure 6 This is a schematic diagram of the structure of the first driving unit of this utility model driving the light mixing plate to enter the light output optical path; Figure 7 This is a schematic diagram of the structure of the second driving unit of this utility model, which drives the entire assembly to translate toward the direction of the light-emitting lens. Figure 8 This is a schematic diagram of the structure of the first driving unit of this utility model, which drives the light mixing plate to fully enter the light output path. Figure 9 This is a schematic diagram of the optical system of this invention when the real-time zoom channel value is T1-T2; Figure 10 This is a schematic diagram of the structure of the light guide component of this utility model; Figure 11 This is a cross-sectional view of the light guide component of this utility model; Figure 12 This is a bottom view of the light guide component of this utility model; Figure 13 This is an exploded view of the structure of the light guide component of this utility model; Figure 14 This is a schematic diagram of the threaded convex surface of the Fresnel mirror of this utility model; Figure 15 This is a schematic diagram of the compound eye concave surface of the Fresnel lens of this utility model; Figure 16 This is a schematic diagram illustrating the principle of the light output path of this utility model; Figure 17 This is a schematic diagram of the optical path before the atomizing plate of this utility model enters the light path. Figure 18 This is a schematic diagram of the optical path after the atomizing plate of this utility model is inserted into the light path; Figure 19 This is a schematic diagram of the module connection structure of this utility model.

[0019] Marker explanation: 1. Light source; 2. Light guide assembly; 21. Mounting bracket; 211. Limiting groove; 22. Housing; 23. Light guide rod; 24. Condensing lens; 25. Atomizing sheet; 26. Fresnel lens; 261. Compound eye concave surface; 262. Threaded convex surface; 3. First drive unit; 31. Atomizing motor; 32. Atomizing flange; 33. Atomizing adhesive plate; 34. Rotary positioning groove; 341. First end position; 342. Second end position; 35. Limiting post; 36. Atomizing motor plate; 361. Light transmission hole; 4. Support frame; 41. Slider; 5. Heat sink assembly; 6. Cooling fan; 7. Guide rail; 8. Second drive unit; 81. Zoom motor plate; 82. Lead screw motor; 83. Motor lead screw; 84. Lead screw flange; 85. Zoom limiting block. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", 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, and are not intended to indicate or imply that the device or component 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 of this utility model.

[0022] like Figure 1-18 As shown, this embodiment provides an optical system for an LED stage spotlight, including a light-emitting optical path. The light-emitting optical path includes a light source 1, a light guide assembly 2, a light mixer, and a light-emitting lens arranged coaxially along the light-emitting direction. The light guide assembly 2 includes a light guide rod 23 and a condenser lens 24 arranged sequentially along the light-emitting direction. A housing 22 is fitted around the light guide rod 23 and the condenser lens 24, and the light-emitting surface of the condenser lens 24 protrudes from one end of the housing 22. The other end of the housing 22 is connected to a mounting bracket 21. One end of the light guide rod 23 is connected to the mounting bracket 21. The light-emitting lens has a compound eye concave surface 261 as its light-emitting surface and a threaded convex surface 262 as its light-emitting surface; the compound eye concave surface 261 is coated with a frosting layer. It also includes a first driving unit 3, which drives the light mixing sheet to rotate clockwise or counterclockwise to cut into or out of the light output path; When the beam angle of the optical system is small, the mixing plate does not intersect the light-emitting path, the focal length of the condenser lens 24 on the light guide assembly 2 is small, and the beam emitted from the light source 1 is not imaged onto the light-emitting lens. The mixing problem at small angles can be easily solved by the atomization layer on the compound eye concave surface 261 of the light-emitting lens. When the beam angle of the optical system is large, the light-emitting lens is very close to the light guide assembly 2, and the beam emitted from the light source 1 is completely imaged onto the light-emitting lens. At this time, the mixing plate needs to be intersected to achieve a greater degree of atomization, thereby achieving uniform light mixing.

[0023] First, this embodiment introduces a light-mixing plate that can be driven by the first driving unit 3, enabling the system to dynamically adjust the light-mixing intensity according to the beam angle requirements. In small-angle mode, the light-mixing plate cuts out the light-emitting path, avoiding the luminous flux loss caused by traditional fixed atomizing plates. This ensures the basic light-mixing effect while maximizing the preservation of the original brightness of the light source 1, meeting the core requirement of high illuminance for the spotlight. In large-angle mode, the light-mixing plate engages, providing a stronger atomization effect and ensuring uniform color mixing under large light spots. This design fundamentally solves the traditional problem of "better color mixing, lower brightness."

[0024] Furthermore, the light-emitting lens employs a combination of a compound eye concave surface 261 and a threaded convex surface 262. The optical properties of the compound eye concave surface 261 help to disperse light and achieve initial light uniformity. Depositing a fogging layer on this surface effectively integrates a light fogging function into the main optical element, replacing the need for an additional fixed fogging plate in small-angle modes, simplifying the structure, and reducing cost and assembly complexity. The threaded convex surface 262 is essentially a Fresnel lens structure, effectively reducing the weight and size of the lens while achieving the required focusing or diverging functions.

[0025] Furthermore, this embodiment solves the problem of uniform color mixing and no color difference at any angle in a colored LED spotlight by optimizing the design of the Fresnel lens 26 and the light guide 23, and dynamically adjusting the mixing intensity according to the beam angle requirements. At the same time, it significantly improves the beam brightness at small angles, and the brightness is 40%-50% higher than that of spotlights with equivalent performance. Moreover, the entire optical system has a simple structure and is easy to manufacture and maintain.

[0026] Specifically, it also includes a support frame 4, a heat dissipation component, and a zoom component. The bottom of the support frame 4 is provided with a slider 41, and the zoom component is provided with a guide rail 7. The slider 41 is slidably connected to the guide rail 7. The heat dissipation component, the light guide component 2, the light mixing sheet, and the first driving unit 3 are all integrated on the support frame 4. The change in the distance that the slider 41 moves on the guide rail 7 corresponds to the zoom distance from the light guide assembly 2 to the light output lens; The zoom assembly includes a second drive unit 8, which drives the support frame 4 to reciprocate in a direction closer to or further away from the light-emitting lens, so as to shorten or lengthen the zoom distance. More specifically, the zoom distance corresponds to different zoom channel values; The zoom component includes a first zoom channel value and a second zoom channel value, and the value of each zoom channel value is in the range of 0-255, wherein the first zoom channel value is less than the second zoom channel value.

[0027] like Figure 19As shown, it also includes a central processing unit (CPU) and a position feedback unit, the position feedback unit being connected to the CPU, and the CPU being communicatively connected to an external console. The position feedback device is used to locate different zoom distances in order to obtain the corresponding real-time zoom channel value; Preferably, the position feedback device is a Hall sensor or a position switch; More specifically, the console is a DMX console, which communicates with the central processing unit via the DMX control protocol and controls the stage lighting in the form of digital signals; the console includes multiple control channels, one of which has a zoom channel value of 0-255; the central processing unit is equipped with a storage unit and control software, and the storage unit is used to store the control channel and zoom channel values.

[0028] Specifically, the second drive unit 8 includes a zoom motor plate 81 and two sets of drive components arranged in parallel; each drive component includes a lead screw motor 82, a lead screw 83, and a lead screw flange 84; one end of the lead screw 83 passes through the center of the lead screw flange 84 and is connected to the output shaft of the lead screw motor 82; the other end of the lead screw 83 is provided with a zoom limit block 85 to ensure the normal rotation of the lead screw 83; the zoom motor plate 81 is used to fix the two lead screw motors 82. The lead screw motor 82 is connected to the central processing unit.

[0029] Specifically, the light output path includes a first beam angle value and a second beam angle value, wherein the first beam angle value is smaller than the second beam angle value; the range of each beam angle value is 12°-20°; More specifically, in this embodiment, the first beam angle value is preferably 12°, and the second beam angle value is preferably 20°; The first driving unit 3 includes an atomizing motor 31, an atomizing flange 32, and an atomizing adhesive plate 33. The light mixing plate is disposed at one end of the atomizing adhesive plate 33, and the other end of the atomizing adhesive plate 33 is connected to the drive shaft of the atomizing motor 31. The atomizing motor 31 drives the atomizing adhesive plate 33 to rotate, thereby causing the light mixing plate to enter or exit the light output path. The atomizing motor 31 is connected to the central processing unit.

[0030] Specifically, the support frame 4 is provided with an atomizing motor plate 36, which is used to fix the first driving unit 3; the atomizing motor plate 36 is provided with a light-transmitting hole 361, which is located on the same optical axis as the light guide component 2; The drive shaft of the atomizing motor 31 passes through the atomizing motor plate 36 and the atomizing adhesive plate 33 in sequence, and is connected to the atomizing flange 32; like Figure 5 As shown, the atomizing adhesive plate 33 is provided with a rotating positioning groove 34 and a limiting post 35. The rotating positioning groove 34 includes a first end 341 and a second end 342 that are arranged opposite to each other. The limiting post 35 is used to abut against the first end 341 or the second end 342. More specifically, the opening of the rotary positioning groove 34 is arc-shaped.

[0031] like Figure 6-9 As shown, when the real-time zoom channel value obtained by the position feedback device does not exceed the first zoom channel value, the limiting post 35 abuts against the first end 341, and the light mixing sheet does not enter the light output path; when the real-time zoom channel value is between the first zoom channel value and the second zoom channel value, the atomizing motor 31 drives the atomizing adhesive plate 33 to rotate, and the light mixing sheet begins to rotate and enter the light output path until the limiting post 35 abuts against the second end 342; when the real-time zoom channel value exceeds the second zoom channel value, the limiting post 35 remains abutting against the second end 342, and the light mixing sheet remains in the state of being entered into the light output path; It should be noted that in the process of setting the corresponding zoom channel value through the beam angle value, this embodiment can verify the measured beam angle value by using a beam angle measuring instrument.

[0032] Specifically, when the support frame 4 zooms in the reverse direction, the same zooming process described above is followed, as follows: When the real-time zoom channel value obtained by the position feedback device exceeds the second zoom channel value, the limiting post 35 remains in contact with the second end 342, and the light mixing plate remains in the state of being cut into the light output path; when the real-time zoom channel value is between the first zoom channel value and the second zoom channel value, the atomizing motor 31 drives the atomizing adhesive plate 33 to rotate in the opposite direction, and the light mixing plate begins to rotate and cut out the light output path until the limiting post 35 abuts with the first end 341; when the real-time zoom channel value does not exceed the first zoom channel value, the limiting post 35 remains in contact with the first end 341, and the light mixing plate remains cut out of the light output path.

[0033] It should be noted that: the above changes can be tested by testing the beam angle value in relation to the zoom stroke position parameter and the fogging control state parameter, and stored in the control channel of the storage unit; when the stage lighting is actually controlled by the control software, only the zoom channel value needs to be changed, and the mixing plate can change in conjunction with the zoom channel value (including maintaining the initial fogging position, linear fogging entry or exit, and maintaining complete fogging entry) to achieve changes in beam angle and beam brightness. Since the fogging in this application is linear entry, it will not cause a rapid jump in the brightness of the light spot.

[0034] It should be further explained that when the beam angle of the stage lighting fixture is small, the entire light path is relatively long, the focal length of the condenser lens 24 on the light guide assembly 2 is small, and the beam emitted from the light source 1 is not imaged onto the Fresnel lens 26. In addition, there is slight fogging on the compound eye concave surface 261 of the Fresnel lens 26, which easily solves the problem of light mixing at small angles. When the beam angle of the stage lighting fixture is large, the Fresnel lens 26 is very close to the light guide assembly 2, and the beam emitted from the light source 1 is completely imaged onto the Fresnel lens 26. After the action of the Fresnel lens 26, the beam is magnified and imaged onto the light spot. At this time, a greater degree of fogging is required to achieve uniform light mixing, therefore, the light mixing plate needs to be inserted.

[0035] Specifically, the heat dissipation component includes a heat sink assembly 5 and a cooling fan 6. The heat sink assembly 5 is disposed on the side of the light source 1 that does not emit light, and the cooling fan 6 is disposed at the bottom of the heat sink assembly 5. The light source 1 is an LED lamp bead board. More specifically, the LED bead board is a multi-color COB light source, and the multi-color COB light source includes red, green, blue, amber, and grass green; or, The LED light bead board is a mixed warm and cool light source.

[0036] Specifically, the light-mixing sheet is an atomizing sheet 25, which is made of frosted glass; the transmittance of the atomizing sheet 25 is 65%. The light-emitting lens is a Fresnel lens 26, which is made of glass. The atomization degree of the atomization layer is 4°-6°, preferably 5° in this embodiment. The atomization degree of the atomization layer is lower than that of the atomizing sheet 25 to eliminate the ring-shaped light emission problem caused by the excessive ring distance of the Fresnel lens 26, so as to make the emitted light spot softer and the light mixing more uniform.

[0037] Specifically, the mounting bracket 21 is provided with a limiting groove 211; one end of the light guide rod 23 passes through the limiting groove 211 and is engaged with the inner wall of the limiting groove 211; an air gap is left between the light guide rod 23 and the condensing lens 24; The cross-sectional shape of one end of the light guide rod 23 is a regular octagon, and the cross-sectional shape of the other end of the light guide rod 23 is a circle. The design of the light guide rod 23 transitioning from a regular octagon to a cylindrical shape makes the light spot emitted at a small angle more uniform and the edges softer. It is easier to form a high-quality circular light spot without the atomizing plate 25 cutting in, thereby greatly reducing optical defects. More specifically, one end of the light guide rod 23, which is in the shape of a regular octagon, passes through the limiting groove 211.

[0038] This embodiment also provides a stage lighting fixture, including a spotlight head, wherein the spotlight head has an optical system as described above.

[0039] like Figure 6-9 As shown in the figure, an example of the use of a stage lighting fixture described in this embodiment is as follows: When the first beam angle is set to 12°, the first zoom channel value is T1. When the measured beam angle is greater than 12°, the second zoom channel value is T2. These two zoom channel values ​​can be obtained based on the actual light output test of the lamp. The position of the atomization linear cut-in can be adjusted according to the difference between T1 and T2. When T1 is detected, the atomization motor 31 controls the atomization plate 25 to start cutting in. When T2 is detected, the atomization plate 25 is in a fully cut-in state. At this time, the brightness of the light spot will not be greatly reduced due to the influence of atomization transmittance at small angles. More specifically, when the real-time zoom channel value is 0-T1, it means that the beam angle of the stage lighting fixture is less than 12°, and the fogging remains in its initial state without cutting in; when the real-time zoom channel value is T1-T2, it means that the beam angle of the stage lighting fixture is greater than 12° and less than 20°, and the fogging cuts in linearly; when the real-time zoom channel value is T2-255, it means that the beam angle of the stage lighting fixture is greater than 20°, and the fogging remains in the cutting state. The above data can be measured by testing the lighting fixtures and stored in the corresponding control channel of the storage unit. The lighting fixtures can be controlled by an external DMX control console to obtain the corresponding zoom channel value. The position feedback device can be used to determine the initial zoom position and set the initial position DM value to 0. The maximum zoom position is 255, and the zoom channel value is 0-255. T1 is a value between 0-255, which satisfies the condition that the beam angle is 12°. The DM value T1 is data obtained from the test of the R&D prototype and is preset in the control channel of the lighting control software. The corresponding zoom channel value is controlled by an external DMX control console. When the channel DM value is less than T1, the atomizing plate 25 will remain in the initial position. When T1 is reached and the device continues to move forward, the atomizing motor 31 will drive the atomizing plate 25 to synchronously and linearly engage (note that the atomization function is a synchronous zoom channel that performs linear engagement, disengagement, or hold, and cannot be controlled independently). When the channel DM value is T2, the linear engagement of the atomization is completed, and the lamp can continue to zoom forward, but the atomizing plate 25 remains in the engagement and hold state. Conversely, when the zoom channel DM value decreases, the support frame 4 will drive the entire device to reverse and retract, and the atomizing motor 31 will drive the atomizing plate 25 to switch between hold engagement, reverse disengagement, or hold disengagement states according to the change in the zoom channel value.

[0040] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to this utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. An optical system for an LED stage spotlight, comprising a light-emitting optical path, characterized in that: The light-emitting optical path includes a light source, a light guide assembly, a light mixer, and a light-emitting lens arranged coaxially along the light-emitting direction; the light guide assembly includes a light guide rod and a condensing lens arranged sequentially along the light-emitting direction, with a housing fitted around the light guide rod and the condensing lens, and the light-emitting surface of the condensing lens protruding from one end of the housing; the other end of the housing is connected to a mounting bracket; one end of the light guide rod is connected to the mounting bracket. The light-emitting lens has a compound eye concave surface as its incident surface and a threaded convex surface as its light-emitting surface; the compound eye concave surface is coated with a frosting layer. It also includes a first driving unit, which drives the light mixing plate to rotate along the plane to cut into or out of the light output path.

2. The optical system according to claim 1, characterized in that, It also includes a support frame, a heat dissipation component, and a zoom component. The bottom of the support frame is provided with a slider, and the zoom component is provided with a guide rail. The slider is slidably connected to the guide rail. The heat dissipation component, the light guide component, the light mixing sheet, and the first drive unit are all integrated on the support frame. The change in the distance the slider moves on the guide rail corresponds to the zoom distance from the light guide assembly to the light-emitting lens; The zoom assembly includes a second drive unit, which drives the support frame to reciprocate in a direction closer to or further away from the light-emitting lens, so as to shorten or lengthen the zoom distance.

3. The optical system according to claim 2, characterized in that, It also includes a central processing unit and a position feedback unit, the position feedback unit being connected to the central processing unit, and the central processing unit being communicatively connected to an external console; The position feedback device is used to locate different zoom distances.

4. The optical system according to claim 3, characterized in that, The second drive unit includes a zoom motor plate and two sets of drive components arranged in parallel; each drive component includes a lead screw motor, a motor lead screw, and a lead screw flange; one end of the motor lead screw passes through the center of the lead screw flange and is connected to the output shaft of the lead screw motor; the other end of the motor lead screw is provided with a zoom limit block; the zoom motor plate is used to fix the two lead screw motors. The lead screw motor is connected to the central processing unit.

5. The optical system according to claim 3, characterized in that, The first driving unit includes an atomizing motor, an atomizing flange, and an atomizing adhesive plate. The light mixing sheet is disposed at one end of the atomizing adhesive plate, and the other end of the atomizing adhesive plate is connected to the drive shaft of the atomizing motor. The atomizing motor drives the atomizing adhesive plate to rotate, thereby causing the light mixing sheet to cut into or out of the light output path; the atomizing motor is connected to the central processing unit.

6. The optical system according to claim 5, characterized in that, The support frame is provided with an atomizing motor plate, which is used to fix the first driving unit; the atomizing motor plate is provided with a light-transmitting hole, which is located on the same optical axis as the light guide component; The drive shaft of the atomizing motor passes through the atomizing motor plate and the atomizing adhesive plate in sequence, and is connected to the atomizing flange; The atomizing adhesive plate is provided with a rotating positioning groove and a limiting post. The rotating positioning groove includes a first end and a second end that are arranged opposite to each other. The limiting post is used to abut against the first end or the second end.

7. The optical system according to claim 2, characterized in that, The heat dissipation component includes a heat sink assembly and a cooling fan. The heat sink assembly is located on the side of the light source that does not emit light, and the cooling fan is located at the bottom of the heat sink assembly. The light source is an LED lamp bead board.

8. The optical system according to claim 1, characterized in that, The light mixing sheet is an atomizing sheet, and the atomizing sheet is made of frosted glass; The light-emitting lens is a Fresnel lens, which is made of glass; the atomization degree of the atomization layer is lower than that of the atomization sheet.

9. The optical system according to claim 1, characterized in that, The mounting bracket is provided with a limiting groove; one end of the light guide rod passes through the limiting groove and is engaged with the inner wall of the limiting groove; an air gap is left between the light guide rod and the condensing lens; The cross-sectional shape of one end of the light guide rod is a regular octagon, and the cross-sectional shape of the other end of the light guide rod is a circle.

10. A stage lighting fixture, comprising a spotlight head, characterized in that, The spotlight head has an optical system as described in any one of claims 1-9.

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