A color mixing system for a stage light

Abstract

A kind of mixing system for stage lamp, by the single color lamp bead 11 arranged according to certain rule, the mixing effect of outgoing light can be significantly optimized, the light emitted by single color lamp bead 11 first enters the light guide frame in the bottom of light collecting component 2, and the mixing of light is realized by the diffuse reflection of outgoing light by each light guide unit 21 of octagonal light guide frame;Outgoing light is guided into light collecting lens 22 by light guide frame, and the light angle is compressed to 85 after twice light collection, then the optical distance is dynamically adjusted by the Fresnel mirror 3 that can be translated along optical axis, the outgoing light with 60 °-80 ° continuously adjustable light angle is formed, and finally projected to imaging plane to form transition natural and uniform spot.

Description

Technical Field

[0001] This utility model relates to the field of stage lighting technology, and more specifically, to a color mixing system for stage lighting. Background Technology

[0002] As stage performances place increasing demands on lighting effects, single-color stage lighting fixtures can no longer meet diverse needs.

[0003] In existing technologies, the mixing system of traditional spotlights usually adopts a combination of reflector cup and lens, which has poor color mixing effect. Therefore, uneven distribution of color blocks is likely to occur after mixing of multi-color light sources. The light output angle of traditional spotlights is usually 60°, and its beam angle is usually small. Therefore, the ratio of its beam angle to spot angle is small, which can easily lead to obvious light intensity discontinuity between the center and edge of the spot formed by the emitted light on the imaging surface. This results in a harsh outline of the projected spot and the inability to achieve a natural gradient effect. Summary of the Invention

[0004] This invention proposes a color mixing system for stage lights, aiming to solve the problems existing in the background technology.

[0005] A color mixing system for stage lighting, comprising: A multi-color light source assembly includes a light source substrate and several monochrome LEDs of different colors mounted in the middle of the light source substrate. The monochrome LEDs are arranged at equal intervals to form a regular polygonal color mixing array. The colors of each pair of adjacent monochrome LEDs are different, and the monochrome LEDs of each color are symmetrically distributed around the center of the light source substrate. The light-concentrating assembly includes a stepped cylinder, several light-guiding units circumferentially attached to the inner wall of the lower part of the cylinder, and a light-concentrating lens located at the upper part of the cylinder. A Fresnel lens changes the size of the light spot by translating back and forth along the direction of light output; The multicolor light source group, the focusing component, and the Fresnel mirror are located sequentially on the light output path.

[0006] As a further improvement of this utility model, several light guide units are arranged to form a regular polygonal light guide frame for guiding the light emitted from the monochromatic lamp beads, and the color mixing array is located within the projection range of the light guide frame in the direction of the light source substrate.

[0007] As a further improvement of this utility model, the number of light guide units is 8, the light guide frame is a regular octagon, and the length of the light guide unit is 60mm.

[0008] As a further improvement of this utility model, the condensing lens includes a first condensing lens located at the lower part and a second condensing lens located at the upper part. The aperture of the light-emitting surface of the light guide frame is smaller than the aperture of the light-incident surface of the first condensing lens, and the aperture of the light-emitting surface of the first condensing lens is smaller than the aperture of the light-incident surface of the second condensing lens.

[0009] As a further improvement of this utility model, the radius of curvature of the second condenser lens is in the range of 88-92mm, and the radius of curvature of the first condenser lens is in the range of 24-27mm.

[0010] As a further improvement of this utility model, the focal length of the Fresnel lens is 3mm-150mm.

[0011] As a further improvement of this utility model, the exit beam angle of the condenser lens is θ, the maximum focal length of the Fresnel lens is L, and the radius is R. The relationship between the exit beam angle θ of the Fresnel lens and the condenser lens satisfies: tan( )= .

[0012] As a further improvement of this utility model, the light emission color of the monochrome LED bead includes, but is not limited to, any one or a combination of red (R), green (G), blue (B), amber (A), lemon yellow (L), and cyan (C).

[0013] As a further improvement of this utility model, the color mixing array is a regular octagon, and no single-color LED beads are set at the center of the color mixing array.

[0014] As a further improvement of this utility model, the cylinder also includes a mounting plate for mounting a multi-color light source group, and the lower part of the cylinder is provided with external threads, and the mounting plate is threadedly connected to the lower part of the cylinder.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: (1) In this utility model, each color of monochrome LED beads is symmetrically distributed in the middle of the light source substrate. The colors of each pair of adjacent single LED beads are different, which is conducive to the initial mixing of the light emitted by the monochrome LED beads. The light of the monochrome LED beads first passes through the light guide frame formed by the light guide unit, and is diffusely reflected by the light guide frame and guided to the first condenser lens to achieve the first focusing. The emitted light that is collected by the first condenser lens enters the second condenser lens to achieve the second focusing. The beam angle of the emitted light after the two focusing is greater than the beam angle of the emitted light of the traditional spotlight. Finally, the emitted light is mixed again by the Fresnel lens and then emitted. The beam angle of the emitted light is large, which can form a bright spot effect with a large area and uniform transition. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the Fresnel lens of this utility model at its minimum focal length.

[0017] Figure 2 This is a schematic diagram of the Fresnel lens of this utility model at its maximum focal length.

[0018] Figure 3 This is a schematic diagram of the monochrome LED arrangement of this utility model.

[0019] Figure 4 This is a cross-sectional view of the light-concentrating component of this utility model.

[0020] In the diagram: 1-Multicolor light source group; 11-Monochrome lamp bead; 12-Light source substrate; 13-Color mixing array; 2-Concentrating light assembly; 21-Light guide unit; 22-Concentrating lens; 221-First condenser lens; 222-Second condenser lens; 23-Cylinder; 231-Mounting plate; 3-Fresnel mirror. Detailed Implementation

[0021] Combined with appendix Figure 1 To be continued Figure 4A color mixing system for stage lighting includes a multicolor light source group, a focusing component, and a Fresnel lens arranged sequentially on the light output path. The multicolor light source group 1 includes a light source substrate 12 and several monochromatic LED beads 11 of different colors mounted in the middle of the light source substrate 12. The light source substrate 12 is a rectangular plate with multiple mounting holes at both ends. The several monochromatic LED beads 11 are arranged at equal intervals to form a regular polygonal color mixing array 13, and the center of the regular polygonal color mixing array 13 formed by the monochromatic LED beads 11 coincides with the center of the light source substrate 12. The colors of each pair of adjacent monochromatic LED beads 11 are different, and the monochromatic LED beads 11 of each color are symmetrically distributed around the center of the light source substrate 12. In this embodiment, the amber LED bead A and the green LED bead G are centrally symmetrically distributed, while the monochromatic LED beads 11 of other colors are axially symmetrically distributed. The emitted light from the various colors of monochromatic LED beads 11 can be more evenly distributed, which is beneficial for better light mixing when the emitted light from the several monochromatic LED beads 11 is emitted. The focusing assembly 2 includes a stepped cylinder 23, several light guide units circumferentially attached to the lower inner wall of the cylinder 23, and a focusing lens 22 located at the upper part of the cylinder. The cylinder 23 is divided into two parts: the lower part of the cylinder 23 is used to install the light guide units 21, and the upper part of the cylinder 23 is used to install the focusing lens 22. The shape of the light guide units 21 is adapted to the polygonal inner wall of the lower part of the cylinder 23, and can completely cover the inner wall of the light guide units 21. Since the colors of each pair of adjacent monochromatic lamp beads 11 are different, the emitted light of the monochromatic lamp beads 11 undergoes preliminary light mixing when emitted. The emitted light is first mixed again by several light guide units 21, and then guided by the light guide units 21 into the focusing lens 22 for two focusing. The Fresnel lens 3 moves back and forth along the light-emitting direction to change the size of the light spot. The size of the light spot is adjusted by changing the divergence angle of the emitted light through adjusting the relative distance between the Fresnel lens 3 and the condenser lens 22. When the Fresnel lens 3 is closer to the condenser lens 22, the beam angle formed by the emitted light from the lamp is larger, and the ratio of the beam angle to the light spot angle is greater, resulting in a brighter central area and slightly darker edge areas; this creates a light spot with a large bright area and a natural transition. Conversely, when the Fresnel lens 3 is farther from the condenser lens 22, the beam angle formed by the emitted light from the lamp is smaller, and the ratio of the beam angle to the light spot angle is relatively smaller, resulting in a brighter central area and slightly darker edge areas; this creates a light spot with a relatively small bright area and a natural transition.

[0022] The multicolor light source group 1, the focusing component 2, and the Fresnel mirror 3 are located sequentially on the light output path.

[0023] The emitted light from the multicolor light source group 1 is light that has undergone preliminary light mixing. After entering the light-concentrating component 2, the emitted light is mixed again and then collected twice, forming a beam with a small emission angle and good color mixing effect. Subsequently, the emitted light enters the Fresnel mirror 3, which can be translated along the emission direction, for further light mixing. The Fresnel mirror 3 can change the size of the light spot formed by the emitted light by changing the beam angle and spot angle of the emitted light. Finally, the emitted light through the Fresnel mirror 3 can form a light spot with a natural transition and uniform color.

[0024] The beneficial effects of this embodiment are that the arrangement of the monochrome LED beads 11, the setting of the light guide unit 21, and the light-emitting surface of the Fresnel lens 3 can effectively improve the light mixing effect of the emitted light, which is conducive to forming a light spot with uniform color; the condenser lens 22 realizes secondary focusing of the emitted light, and the Fresnel lens 3 can change the beam angle and spot angle of the emitted light, which is conducive to forming a light spot with a large bright area and uniform transition.

[0025] As a new implementation method, combined with the appendix Figure 1 and attached Figure 2 A plurality of light guide units 21 are arranged to form a regular polygonal light guide frame for guiding the emitted light from a plurality of monochromatic lamp beads 11. The plurality of monochromatic lamp beads 11 are located within the projection range of the light guide frame in the direction of the light source substrate 12. In this embodiment, the light guide unit 21 is a rectangular lens, and the inner wall of the lower part of the cylinder 23 is a regular polygonal structure; the light guide frame formed by the plurality of light guide units 21 has the same shape as the inner wall of the lower part of the cylinder 23, and the outer surface of the light guide frame is in close contact with the inner wall; when there is a gap between every two adjacent light guide units 21, part of the emitted light entering the light guide frame will be absorbed by the black light-absorbing inner wall of the cylinder, increasing unnecessary light loss; therefore, when every two adjacent light guide units 21 are in close contact with each other, the reflectivity of the light guide frame can reach 98%; the first condenser lens A gap exists between the light guide unit 221 and the light guide unit 21, which facilitates the installation of the fitting structure; a gap exists between the first condenser lens 221 and the second condenser lens 222 to prevent interference and wear between the first condenser lens 221 and the second condenser lens 222; the shape of the color mixing array 13 formed by several monochromatic lamp beads 11 is the same as the shape of the light guide frame, and the radius of the inscribed circle of the color mixing array 13 is smaller than the radius of the inscribed circle of the light guide frame; the emitted light from the monochromatic lamp beads 11 can all enter the light guide frame formed by the light guide unit 21, which helps to reduce light loss. The beneficial effect of this embodiment is that the emitted light from the monochromatic lamp beads 11 can all enter the light guide frame, the light guide frame can remix the emitted light, and the light loss during the color mixing process can be reduced.

[0026] As a new implementation method, combined with the appendix Figure 1The light guide unit 21 consists of eight pieces, with a regular octagonal light guide frame and a length of 60mm for each unit. The octagonal light guide frame, compared to a regular hexagonal frame, has two more reflective surfaces, resulting in diffuse reflection of the emitted light in eight directions within the frame. Therefore, the octagonal frame provides better light mixing. A shorter length for the light guide unit 21 results in poorer color mixing, while a longer length leads to higher light loss after entering the frame. The advantage of this implementation is that a length of 60mm for the light guide unit 21 provides good color mixing within the frame and lower light loss after entering the frame.

[0027] As a new implementation method, combined with the appendix Figure 1 and attached Figure 2 The condenser lens 22 includes a first condenser lens 221 located at the bottom and a second condenser lens 222 located at the top. The aperture of the light-emitting surface of the light guide frame is smaller than the aperture of the light-incident surface of the first condenser lens 221, and the aperture of the light-emitting surface of the first condenser lens 221 is smaller than the aperture of the light-incident surface of the second condenser lens 222. Both the first condenser lens 221 and the second condenser lens 222 are plano-convex lenses, and the first condenser lens 221 and the second condenser lens 222 are arranged alternately with the light guide frame. The gap between the first condenser lens 221 and the light guide frame is small, and the light-incident surface of the first condenser lens 221 is directly above the light-emitting surface of the light guide frame, which can effectively prevent the emitted light from escaping from the gap between the light guide frame and the first condenser lens 221, which is conducive to the fact that all the emitted light can enter the first condenser lens 221. Although the exit angle of the emitted light after passing through the first condenser lens 221 is reduced, the emitted light... Since the light is still relatively diffuse, a second condenser lens 222 is provided. When the aperture of the light-incident surface of the second condenser lens 222 is larger than the aperture of the light-outceasing surface of the first condenser lens, most of the light passing through the first condenser lens 221 can enter the second condenser lens 222. The beneficial effect of this embodiment is that most of the outgoing light can enter the first condenser lens 221 and the second condenser lens 222 through the light guide frame, which not only effectively reduces the light-outceasing angle of the outgoing light, but also allows most of the outgoing light to enter the color mixing system, effectively improving the light utilization rate.

[0028] As a new implementation method, combined with the appendix Figure 1 and attached Figure 2The radius of curvature of the second condenser lens 222 ranges from 88 to 92 mm, and the radius of curvature of the first condenser lens 221 ranges from 24 to 27 mm. When the radius of curvature of the first condenser lens 221 is less than 24 mm, the exit angle of its emitted light will be too small, resulting in concentrated light. When the radius of curvature of the first condenser lens 221 is greater than 27 mm, the exit angle of its emitted light will be too large, resulting in diffused light. Similarly, when the radius of curvature of the second condenser lens 222 is less than 88 mm, the exit angle of its emitted light will be too small, resulting in concentrated light. When the radius of curvature of the second condenser lens 222 is greater than 92 mm, the exit angle of its emitted light will be too large, resulting in diffused light. In this embodiment, the radius of curvature of the first condenser lens 221 is 25.3 mm, and the radius of curvature of the second condenser lens 222 is 90 mm. At this time, the beam effect formed by the emitted light after passing through the first condenser lens 221 and the second condenser lens 222 is the best, and the exit angle of the emitted light from the condenser lens 22 is 85°. The beneficial effect of this embodiment is that the first condenser lens 221 and the second condenser lens 222 can effectively reduce the exit angle of the emitted light, making the emitted light more collimated after passing through the condenser lens 22.

[0029] As a new implementation method, combined with the appendix Figure 1 and attached Figure 2The focal length of the Fresnel lens 3 is 3mm-150mm. In this embodiment, the Fresnel lens 3 can be translated along the light-emitting direction, either relatively closer to or relatively farther away from the condenser lens 22. The minimum distance between the Fresnel lens 3 and the condenser lens 22 is 2.3mm, which effectively avoids interference between the Fresnel lens 3 and the condenser lens 22, preventing wear on the light-emitting surface of the condenser lens 22 and affecting its light-emitting effect. When the focal length of the Fresnel lens 3 is 3mm, the light-emitting angle of the light emitted through the Fresnel lens 3 is approximately 80°. The beam angle of the emitted light is 70°, and the spot angle is 80°. At this time, the ratio of the beam angle to the spot angle is relatively large, and the emitted light can form a large bright area and a relatively dark area. The light spot is narrow and has a uniform transition between bright and dark areas. In contrast, the bright area of ​​the light spot formed by the beam of a traditional spotlight at the same focal length is smaller than that formed by the light spot at the same focal length of this invention. That is, at the same focal length, the beam angle of a traditional spotlight is smaller than that of this invention. When the focal length of the Fresnel lens 3 is 150mm, the angle of the light rays exiting the Fresnel lens 3 is approximately 60°. The beam angle of the exiting light is 50°, and the spot angle is 60°. At this time, the light spot formed by the exiting light is smaller than the light spot formed when the focal length of the Fresnel lens 3 is 3mm. Due to the reduced beam angle, the bright area of ​​the light spot also decreases. The beneficial effect of this embodiment is that the Fresnel lens 3 can be shifted within the focal length range, and the focal length of the Fresnel lens 3 can be adjusted according to actual needs to form light spots of various sizes.

[0030] As a new implementation method, combined with the appendix Figure 2 The exit beam angle of the condenser lens 22 is θ, the maximum focal length of the Fresnel lens 3 is L, the radius of the Fresnel lens 3 is R, and the relationship between the Fresnel lens 3 and the beam angle θ of the light emitted through the condenser lens 22 satisfies: tan( )= The radius of the Fresnel lens 3 calculated by this formula is the maximum radius of the Fresnel lens 3. That is, when the radius of the Fresnel lens 3 is R, all outgoing light rays can enter the Fresnel lens 3. In this embodiment, the outgoing beam angle of the condenser lens 22 is about 85°, and the maximum focal length of the Fresnel lens 3 is 150mm. The calculated maximum value of the Fresnel lens 3 is 137mm. That is, when the diameter of the Fresnel lens 3 is 274mm, all outgoing light rays passing through the condenser lens 22 can enter the Fresnel lens 3. Although the condenser lens 22 has gathered most of the light, a small amount of light rays still maintain a large angle, and the housing of the lamp is compatible with the Fresnel lens 3. As those skilled in the art can understand, when the diameter of the Fresnel lens 3 is 200mm, most of the outgoing light rays can enter the Fresnel lens 3, and the diameter of the Fresnel lens 3 can be adapted to small-volume lamps. The beneficial effect of this embodiment is that when the radius of the Fresnel mirror 3 is 200mm, most of the outgoing light rays can enter the Fresnel mirror 3, and the Fresnel mirror 3 can be installed on a small-volume lamp.

[0031] As a new implementation method, combined with the appendix Figure 3 The single-color LED beads 11 emit colors including, but not limited to, any one or a combination of red (R), green (G), blue (B), amber (A), lemon yellow (L), and cyan (C). In this embodiment, each single-color LED bead 11 can emit light independently or in combination. When multiple single-color LED beads 11 emit light simultaneously, the light spot formed by the emitted light from the plurality of single-color LED beads 11 is a white light spot. When only one single-color LED bead 11 emits light independently, the light spot formed by the emitted light is a light spot of that color. For example, when only red LED bead R emits light, the light beam or light spot formed by the emitted light is red. It is understood that two different colors of single-color LED beads 11 can also emit light simultaneously, or three, four, five, etc. The beneficial effect of this embodiment is that each single-color LED bead 11 can emit light independently or in combination, forming light beams and light spots of various different colors.

[0032] As a new implementation method, combined with the appendix Figure 3The color mixing array 13 is a regular octagon, and no single-color LED bead 11 is placed at the center of the color mixing array 13. In conventional spotlights, single-color LED beads are usually placed at the center of the color mixing array when arranging single-color LED beads; if no single-color LED bead is placed at the center of the color mixing array, a dark area will be formed at the center of the light spot formed by the emitted light. However, in this embodiment, no single-color LED bead 11 is placed at the center of the color mixing array 13, but no dark area is formed at the center of the light spot formed by the emitted light, that is, the emitted light can form a light spot with uniform color. This is because the single-color LED beads 11 of each color are symmetrically distributed around the center of the light source substrate 12, and the emitted light of each single-color LED bead 11 can be evenly distributed. That is, when only one single-color LED bead 11 emits light, the emitted light of this symmetrical and evenly arranged single-color LED bead 11 can form a light spot with uniform color. On the contrary, when a single-color LED bead is placed at the center of the color mixing array 13, the light spot formed by the emitted light will have problems such as local brightness and color blocks. The beneficial effect of this embodiment is that since no monochrome LED beads 11 are provided at the center of the color mixing array 13, it can prevent the center of the light spot formed by the emitted light from having a color deviation or being too bright.

[0033] As a new implementation method, combined with the appendix Figure 4 The cylinder 23 also includes a mounting plate 231 for mounting a multi-color light source assembly. The lower part of the cylinder 23 has external threads, and the mounting plate 231 is threadedly connected to the lower part of the cylinder 23. The mounting plate 231 has a rectangular structure, with a through hole in the center for clearing the circular hole. The through hole has internal threads. The lower end of the lower part of the cylinder 23 has external threads that match the internal threads of the through hole. The mounting plate 231 is fixed to the lower end of the lower part of the cylinder. Mounting holes for mounting the light source substrate 12 are provided around the mounting plate 231, and the light source substrate 12 is locked onto the mounting plate. The beneficial effect of this embodiment is that the light source substrate 12 is fixed to the lower part of the cylinder 23 by the mounting plate 231, which shortens the distance between the monochrome LED bead 11 and the light guide unit 21, and makes it easier to assemble and disassemble the light source substrate 12.

[0034] The working principle of the technical solution of this utility model is explained as follows, as shown in the appendix. Figure 1 To be continued Figure 4 As shown, the monochromatic LED beads 11 arranged according to a specific pattern can significantly optimize the color mixing effect of the emitted light. The light emitted by the monochromatic LED beads 11 first enters the light guide frame at the bottom of the focusing assembly 2. After diffuse reflection of the emitted light by each light guide unit 21 of the regular octagonal light guide frame, the light mixes. The emitted light is guided by the light guide frame into the focusing lens 22. After two focusing processes, the light output angle is compressed to 85°. Then, the optical distance is dynamically adjusted by the Fresnel lens 3, which can be translated along the optical axis, forming an emitted light with a continuously adjustable light output angle of 60°-80°. Finally, it is projected onto the imaging surface to form a light spot with a natural and uniform transition.

Claims

1. A color mixing system for stage lighting, characterized in that, include: A multicolor light source group includes a light source substrate and several monochrome LEDs of different colors mounted in the middle of the light source substrate. The monochrome LEDs are arranged at equal intervals to form a regular polygonal color mixing array. The colors of each pair of adjacent monochrome LEDs are different, and the monochrome LEDs of each color are symmetrically distributed around the center of the light source substrate. The light-concentrating assembly includes a stepped cylinder, several light-guiding units circumferentially attached to the inner wall of the lower part of the cylinder, and a light-concentrating lens located at the upper part of the cylinder. A Fresnel lens changes the size of the light spot by translating back and forth along the direction of light output; The multicolor light source group, the focusing component, and the Fresnel mirror are located sequentially on the light output path.

2. The color mixing system for stage lights according to claim 1, characterized in that, Several light guide units are arranged to form a regular polygonal light guide frame for guiding the light emitted from the monochromatic lamp beads. The color mixing array is located within the projection range of the light guide frame in the direction of the light source substrate.

3. A color mixing system for stage lighting according to claim 2, characterized in that, The number of light guide units is 8, the light guide frame is a regular octagon, and the length of the light guide unit is 60mm.

4. A color mixing system for stage lighting according to claim 2, characterized in that, The condensing lens includes a first condensing lens located at the bottom and a second condensing lens located at the top. The light-emitting surface diameter of the light guide frame is smaller than the light-incident surface diameter of the first condensing lens, and the light-emitting surface diameter of the first condensing lens is smaller than the light-incident surface diameter of the second condensing lens.

5. A color mixing system for stage lighting according to claim 4, characterized in that, The radius of curvature of the second condenser lens ranges from 88 to 92 mm, and the radius of curvature of the first condenser lens ranges from 24 to 27 mm.

6. A color mixing system for stage lighting according to claim 1, characterized in that, The focal length of the Fresnel lens is 3mm-150mm.

7. A color mixing system for stage lighting according to claim 6, characterized in that, The exit beam angle of the condenser lens is θ, the maximum focal length of the Fresnel lens is L, and the radius is R. The relationship between the exit beam angle θ of the Fresnel lens and the condenser lens satisfies: tan( )= .

8. A color mixing system for stage lighting according to claim 1, characterized in that, The luminous color of the monochromatic LED bead includes, but is not limited to, any one or a combination of red (R), green (G), blue (B), amber (A), lemon yellow (L), and cyan (C).

9. A color mixing system for stage lighting according to claim 1, characterized in that, The color mixing array is a regular octagon, and no single-color LED is placed at the center of the color mixing array.

10. A color mixing system for stage lighting according to claim 1, characterized in that, The cylinder also includes a mounting plate for mounting a multi-color light source group. The lower part of the cylinder is provided with external threads, and the mounting plate is threadedly connected to the lower part of the cylinder.

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