CN201487708U - LED Stage Lighting Equipment with Improved Color Uniformity - Google Patents

Abstract

An LED stage lighting device for improving color uniformity, comprising three LED arrays emitting red light, green light, and blue light respectively, a lens array facing each LED array, a light splitting and color combining device, and a focusing lens; in particular, It also includes a pair of fly-eye lenses placed between the light-splitting and color-combining device and the focusing lens, the pair of fly-eye lenses includes two opposite fly-eye lenses, and each fly-eye lens is composed of a plurality of closely coupled and identical mirror curvatures. along the direction of the optical path, the latter fly-eye lens is located at the focal point of the former fly-eye lens. The fly-eye lens cuts and integrates the light initially mixed by the color combining and splitting device, thereby improving the uniformity of the mixed light, improving the white field brightness and color uniformity of the projected image, and solving the problem of LED stage lighting in the prior art. Color cast problem of lighting equipment.

Description

LED Stage Lighting Equipment with Improved Color Uniformity

technical field

The utility model relates to functional features or parts of a lighting device or its system, in particular to equipment mainly used for stage lighting.

Background technique

The high-power stage lighting in the prior art mainly uses metal halide discharge bulbs as the light source; since the metal halide discharge bulbs are white light sources, the light color emitted by the lighting equipment needs to be realized by setting a filter in front of the metal halide discharge bulbs. The service life of the metal halide discharge bulbs is relatively low, ranging from hundreds of hours to thousands of hours; if a light filter is used to obtain stage lighting of various colors, the color saturation of the projected image is low, the color is not bright, and the color Not rich either. The light-emitting diode (LED) light source is a green, pollution-free, clean, energy-saving light source with a long service life. As the luminous flux increases year by year, the LED light source has gradually become the preferred device for development and application in the lighting field. The LED light source can emit a variety of monochromatic light. If the stage lighting equipment adopts the LED light source, the filter in the traditional method can be omitted, and the principle of RGB three-color light can be used to adjust the red light, green light and blue light. The LED current method is used to obtain RGB three-primary color mixed light of any color. Due to the relatively high color saturation of monochromatic LEDs, the use of LED light sources in stage lighting has a very high degree of freedom in color expression.

In the prior art, LEDs generate high heat, a single LED chip cannot withstand high power, and the luminous efficiency is not very high. Usually, an LED array is used to achieve high luminous flux to obtain an ideal light source for stage lighting.

The Chinese patent with the application number 200720061982.0 discloses a light source assembly for a stage light, which uses an LED array and a large cooling device, can provide a luminous power of 100 watts, and can control the work of different colored LEDs in the LED array. Implement color adjustments. Its shortcoming is: based on performance indicators such as heat dissipation and luminous flux, especially the consideration of the uniformity of bright color of the output light, this light source module cannot meet the needs of high-power stage lighting.

For this reason, the company has proposed in the Chinese patent application that the monochromatic light from multiple LED arrays is synthesized into one beam through a light splitting and color combining device, which can increase the output power of the light source and improve the uniformity of light output brightness.

Also there are some defectives and weak points in above-mentioned technology:

1. The emission spectrum, brightness and temperature characteristics of each LED chip that make up the LED array are different. The characteristics of light emitted by each LED chip, such as brightness and spectrum, are different, resulting in partial color cast of the projected image;

2. Relying solely on the light-splitting and color-combining device cannot achieve a good light mixing effect after mixing the monochromatic lights, resulting in poor color uniformity of the image projected on the stage or screen, especially the projected white field. Color cast.

Utility model content

The technical problem to be solved by the utility model is to avoid the deficiencies of the prior art and propose an LED stage lighting equipment with improved light mixing effect to solve the problem of color cast in images projected on the stage or screen.

The present invention can also solve the technical problem by adopting the following technical solutions:

Design and manufacture an LED stage lighting equipment that improves color uniformity, including three LED arrays emitting red light, green light, and blue light respectively, a lens array facing each LED array, a light splitting and color combining device, and a lens; The light emitted by each of the above-mentioned LED arrays is respectively injected into the light splitting and color combining device through the respective facing lens arrays for light mixing, and then the stage lighting light is emitted through the lens; A fly-eye lens pair in between, the fly-eye lens pair includes two opposite fly-eye lenses, each fly-eye lens is composed of a plurality of lens units that are closely connected together and have the same mirror curvature; along the direction of the optical path, the latter fly-eye lens is located At the focal point of the previous fly eye lens.

In order to improve the utilization rate of the LED light source, the longitudinal section of each lens unit is regular hexagonal or square, and the lens units are seamlessly connected together; or, the longitudinal section of each lens unit is circular, and the edge of each lens unit Tangentially closely linked together. The fly-eye lens is made of glass, or made of plastic and processed through a film-opening process. The fly-eye lens pair is integrally formed.

The light-splitting and color-combining device is an X-type light-splitting and color-synthesizing device, or a light-splitting and color-synthesizing prism; the X-type light-splitting and color-synthesizing device includes two vertically intersecting light-splitting and color-synthesizing filters, and the two light-splitting and color-synthesizing filters Three light entrances and one light exit formed by crossing light sheets; the light-splitting color filter is a dichroic film, or a light-transmitting film coated with a light-splitting filter film.

The light-splitting and color-synthesizing device can also be the following scheme, comprising two parallel light-splitting and color-synthesizing filters; The port and the second incident port, and the exit port laterally opposite to the reflective surface of the light-splitting color filter. Along the light beam direction, the exit port of the first light-splitting and color-synthesizing filter is facing the first entrance of the second light-splitting and color-synthesizing filter, so that the light from the three LED arrays respectively enters the first Two entrances of the light-splitting and color-synthesizing filter and the second entrance of the second light-splitting and color-synthesizing filter, and the synthesized light is emitted from the exit port of the second light-splitting and color-synthesizing filter. The light-splitting color filter is a dichroic film, or a light-transmitting film coated with a light-splitting filter film.

The LED stage lighting equipment also includes a gobo plate with a gobo plate arranged on the light exit path of the lens.

Compared with the prior art, the technical effect of the utility model "LED stage lighting equipment with improved light mixing effect" lies in:

The fly-eye lens cuts and integrates the light initially mixed by the color combining and splitting device, thereby improving the uniformity of the mixed light, improving the white field brightness and color uniformity of the image projected on the stage or screen, and solving the problem of The color cast problem of LED stage lighting lighting equipment in the prior art; moreover, while solving the color cast problem of LED stage lighting lighting equipment, considering that the lighting spot matches the circular pattern, the longitudinal section of each lens unit of the fly-eye lens pair The regular hexagonal design is adopted to optimize the optical efficiency.

Description of drawings

Fig. 1 is the optical path schematic diagram of the first embodiment of the utility model;

FIG. 2 is a schematic diagram of the optical path principle of the fly-eye lens 300 of the first embodiment;

FIG. 3 is a schematic diagram of an orthographic projection of the gobo wheel 500 of the first embodiment;

FIG. 4 is a schematic diagram of an orthographic projection of the fly-eye lens 300 of the first embodiment;

Fig. 5 is a partial schematic view of the longitudinal section of the embodiment of the fly-eye lens in Fig. 4;

Fig. 6 is a schematic diagram of light energy loss of the embodiment of the fly-eye lens in Fig. 4;

Fig. 7 is the projection spot obtained by the first embodiment;

Fig. 8 is the illuminance test curve of the spot shown in Fig. 7;

FIG. 9 is a schematic diagram of the orthographic projection of the second embodiment of the fly-eye lens 300 of the present invention;

Fig. 10 is a partial schematic diagram of the longitudinal section of the embodiment of the fly-eye lens in Fig. 9;

FIG. 11 is a schematic partial orthographic projection of the third embodiment of the fly-eye lens 300 of the present invention;

Fig. 12 is a schematic diagram of light energy loss of the fly-eye lens in Fig. 11;

Fig. 13 is a schematic diagram of the optical path of the second embodiment of the device of the present invention.

Detailed ways

Further details will be given below in conjunction with various embodiments shown in the accompanying drawings.

The utility model relates to an LED stage lighting equipment for improving color uniformity, as shown in Fig. 1, comprising three LED arrays 110 emitting red light, green light, and blue light respectively, and a lens array 120 facing each LED array respectively. , the light splitting and color combining device 200 and the focusing lens 400. The LED array 110 is composed of LED chips 111 uniformly arranged in an array, thereby forming an array light source. The lens array is composed of lenses 121 facing each LED chip 111 respectively. The light emitted by each of the LED arrays 110 respectively enters the light-splitting and color-combining device 200 through the lens arrays 120 facing each other for light mixing, and then emits stage lighting light through the focusing lens 400 . In particular, the LED stage lighting equipment also includes a fly-eye lens pair 300 placed between the light-splitting and color-synthesizing device 200 and the focusing lens 400, the fly-eye lens pair 300 includes two opposite fly-eye lenses, each fly-eye lens The lenses are all composed of a plurality of lens units 310 closely connected together with the same curvature of the mirror surfaces; along the direction of the optical path, the latter fly-eye lens is located at the focal point of the former fly-eye lens.

In order to make the light spot projected on the stage have a pattern effect, the LED stage lighting equipment further includes a pattern plate 500 with a pattern plate, and the pattern plate is arranged on the outgoing light path of the focusing lens 400 .

In various embodiments of the present invention, the LED chip 111 of the LED array 110 is a square light source with a light emitting angle of 180°. The lens array 120 collimates the light emitted by each LED chip 111 into a nearly parallel beam. The light-splitting and color-synthesizing device 200 is used to preliminarily mix three monochromatic lights of red, green and blue and emit the mixed parallel light. On the optical path between the light-splitting and combining device 200 and the focusing lens 400, along the direction of the optical path, the fly-eye lens 300 located in front focuses the mixed parallel light emitted from the color-combining and combining device 200 on the surface of the rear fly-eye lens 300 . Each lens unit 310 of the fly-eye lens 300 at the front cuts and integrates the light intensity on the incident area, and each lens unit 310 of the fly-eye lens 300 at the front forms an image on the pattern plate 500 through the fly-eye lens 300 and the focusing lens 400 at the rear Above, each lens unit 310 performs intensity integration on the gobo disk 500, that is, the front surface of each lens unit 310 of the fly-eye lens 300 in the front is imaged at the gobo disk 500, so that a good brightness uniformity is obtained on the gobo disk 500 and color uniformity. Fig. 7 and Fig. 8 are experimentally measured light spots and their optical characteristics projected by the application of the present invention. It can be seen that the optical characteristics (illuminance) of the light spots are very uniform. Therefore, the present invention solves the color cast problem of the LED stage lighting equipment in the prior art, and improves the uniformity of the color.

The shape of the longitudinal section of the lens unit 310 when placed vertically should match the shape of the gobo plate 500 to achieve higher optical utilization. In stage lighting, it is usually necessary to project a circular light spot on the stage, so in the first embodiment of the present invention and other embodiments, as shown in Figure 3, the gobos on the gobo wheel 500 are more commonly used is round. At this time, the shape and arrangement of the lens units 310 of the fly-eye lens 300 are the main factors causing light energy loss. Considering the improvement of the optical efficiency of the fly-eye lens 300, the seamless connection of the lens units 310 is required. Generally, the seamless connection of the lens units 310 can only be achieved when the longitudinal center section is a regular polygon. However, when the regular polygonal light spot formed by the fly-eye lens 300 is projected on the circular gobo, part of the light cannot be projected on the circular gobo, resulting in loss of light energy. Considering the improvement of the optical efficiency from the aspect of the gobo wheel 500 , it is required that the shape of the projected light spot is circular, so the longitudinal section of each lens unit 310 is preferably circular. However, such lens units 310 with a circular longitudinal section cannot be seamlessly connected, but can only be connected tangentially. At this time, not all light rays can pass through each lens unit 310 , resulting in loss of light energy. In the first embodiment of the fly-eye lens of the present invention, as shown in FIG. 4 and FIG. 5 , the vertical cross-section of the lens unit 310 is a regular hexagon, and each lens unit 310 is closely connected seamlessly. The shaded portion 610 in FIG. 6 is the light energy loss portion when the light spot area projected on the gobo is the largest. In the second embodiment of the fly-eye lens of the present invention, as shown in FIG. 9 and FIG. 10 , the longitudinal section of the lens unit 310 when placed upright is circular, and the lens units 310 are close to each other and connected together tangentially. At this time, although the projected light spot can cover the whole gobo, the light passing through the shaded portion 620 in FIG. 10 cannot be projected on the gobo. Therefore, the shaded portion 620 is the light energy loss part of the second embodiment. In the third embodiment of the fly-eye lens of the present invention, as shown in FIG. 11 , the vertical cross-section of the lens unit 310 is square, and the lens units 310 are seamlessly connected together tightly. The shaded portion 630 in FIG. 12 is the light energy loss portion when the light spot area projected on the gobo is the largest. Analyzing FIG. 6 , FIG. 10 and FIG. 12 , it can be determined that, for a circular pattern sheet with the same area, the light energy loss of each of the first to third embodiments increases gradually.

The fly-eye lens 300 is made of glass, or made of plastic and processed by film opening. Considering cost and easy assembly, the fly-eye lens pair 300 is preferably integrally formed, so that the two sides facing the optical path will be wavy and convex.

The color combining and splitting device 200 can have the following two implementation schemes:

As shown in Figure 1, the described light separation and color combination device 200 is an X-type light separation and color combination device 210, or a light separation and color combination prism; the X type light separation and color combination device 210 includes two vertically intersecting light separation and color combination filters 230, and three light entrances 212 and one light exit port 213 formed by the intersection of the two light-splitting color filters 230; the light-splitting color filter 230 is a dichroic film, or is coated with Light-transmitting sheet of light film.

As shown in Figure 13, the second embodiment of the device of the present invention, the light-splitting and color-synthesizing device 200 includes two parallel light-splitting and color-synthesizing filters 230; The first incident port 231 and the second incident port 232 of the two sides of the optical filter 230, and the exit port 233 laterally opposite to the reflective surface of the light splitting color filter 230; along the light beam direction, the first light splitting and combining The exit port 233 of the color filter 230 is facing the first entrance port 231 of the second light-splitting and color-combining filter 230, so that the light from the three LED arrays 110 enters the first light-splitting and color-splitting filter respectively. Two entrances 231, 232 of the optical filter 230 and the second entrance 232 of the second light-splitting and color-combining filter 230, the combined light is emitted from the exit port 233 of the second light-splitting and color-combining filter 230 ; The light-splitting and color-synthesizing filter 230 is a dichroic film, or a light-transmitting film coated with a light-splitting filter film.

Claims (8)

1. An LED stage lighting device for improving color uniformity, comprising three LED arrays (110) emitting red light, green light, and blue light respectively, lens arrays (120) facing each LED array respectively, light splitting and color combining device (200) and focusing lens (400); the light emitted by each of the LED arrays (110) enters the light-splitting and color-combining device (200) through the lens arrays (120) facing each other for light mixing, and then passes through the The focusing lens (400) emits stage lighting light; it is characterized in that: It also includes a fly eye lens pair (300) placed between the light splitting and color combining device (200) and the focusing lens (400), the fly eye lens pair (300) includes two opposite fly eye lenses, each fly eye lens It is composed of a plurality of lens units (310) that are closely connected together and have the same mirror curvature; along the direction of the light path, the latter fly-eye lens is located at the focal point of the former fly-eye lens. 2. The LED stage lighting equipment for improving color uniformity according to claim 1, characterized in that: The longitudinal section of each lens unit (310) is either a regular hexagon or a square; each lens unit (310) is seamlessly connected together. 3. The LED stage lighting equipment for improving color uniformity according to claim 1, characterized in that: The longitudinal section of each lens unit (310) is circular, and the edges of each lens unit (310) are closely connected together tangentially. 4. The LED stage lighting equipment for improving color uniformity according to claim 1, characterized in that: The light-splitting and color-combining device (200) is an X-type light-splitting and color-synthesizing device (210), or a light-splitting and color-synthesizing prism; the X-type light-splitting and color-synthesizing device (210) includes two vertically intersecting light-splitting and color-synthesizing filters (230), and three light entrances (212) and one light exit (213) formed by the intersection of the two photosynthetic color filters (230). 5. The LED stage lighting equipment for improving color uniformity according to claim 1, characterized in that: The light-splitting and color-combining device (200) includes two parallel light-splitting and color-synthesizing filters (230); The first incident port (231) and the second incident port (232) of side incidence, and the exit port (233) laterally opposite to the reflective surface of the light-splitting color filter (230); Along the beam direction, the exit port (233) of the first light-splitting and color-synthesizing filter (230) is facing the first entrance (231) of the second light-splitting and color-synthesizing filter (230), thereby, from the The light of the three LED arrays (110) enters the two entrances (231, 232) of the first light-splitting and color-synthesizing filter (230) and the second port of the second light-splitting and color-synthesizing filter (230) respectively. The input port (232), and the synthesized light is emitted from the output port (233) of the second light-splitting and color-synthesizing filter (230). 6. The LED stage lighting equipment for improving color uniformity according to claim 4 or 5, characterized in that: The light-splitting color filter (230) is a dichroic film, or a light-transmitting film coated with a light-splitting filter film. 7. The LED stage lighting equipment for improving color uniformity according to claim 1, characterized in that: It also includes a pattern plate (500) with a pattern plate, and the pattern plate is arranged on the outgoing light path of the focusing lens (400). 8. The LED stage lighting equipment for improving color uniformity according to claim 1, characterized in that: The fly-eye lens pair (300) is integrally formed.

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