Color mixing device

Abstract

The invention provides a color mixing device. The color mixing device comprises a light source module, an achromatic module and a first color mixing module which are arranged in sequence, the light source module comprises at least two monochromatic light sources with different wavelengths; the first color mixing module comprises a first prism, the first prism is provided with a first incident plane and n first non-incident planes, the first incident plane is arranged close to one side of the achromatic module, a first reflecting mirror is arranged on one side of each first non-incident plane, and a gap is formed between the first non-incident plane and the first reflecting mirror; light emitted by the light source module is collimated by the achromatic module, enters the first color mixing module from the first incident plane for at least six times of refraction and light splitting, and is emitted from the first incident plane to form a first-stage mixed light beam. According to the color mixing device, the light rays emitted by the monochromatic light sources are synthesized into white light or mixed light of other colors through the prism by reversely applying the light splitting principle of the prism, the structure is simple, and the manufacturing cost is low.

Description

technical field [0001] The invention relates to the technical field of lighting, in particular to a color mixing device. Background technique [0002] Stage lighting, projectors, projection lamps and other lamps all have the demand for color change, and the lighting part is realized by mixing multi-color light sources, for example, colored LED RGB light sources can be used. However, in the field of projection, with the development of the industry, the requirement for the uniformity of color mixing is getting higher and higher, because if the light mixing of the lighting components is not uniform, it will eventually be projected to the receiving surface through the projection lens, resulting in inconsistency in the color of the picture. The picture is mottled. [0003] There are three kinds of polychromatic light color mixing methods in the prior art. The first polychromatic light color mixing method uses X-CUBE color combining prism, and its structural principle is as follo...

AI Technical Summary

Problems solved by technology

However, in the field of projection, with the development of the industry, the requirement for the uniformity of color mixing is getting higher and higher, because if the light mixing of the lighting components is not uniform, it will eventually be projected to the receiving surface through the projection lens, resulting in inconsistency in the color of the picture. mottled picture

[0003] There are three kinds of polychromatic light color mixing methods in the prior art. The first polychromatic light color mixing method uses X-CUBE color combining prism, and its structural principle is as follows figure 1 As shown, the color combination of the three light beams of RGB is realized by adopting a high-pass filter film or a low-pass filter film on the bonding surfaces of the four prisms. This structure has the following disadvantages: (1) its effect on the color combination prism The production requirements are very high and the production cost is high; (2) It needs to be combined with four triangular prisms, resulting in a relatively large weight for the overall equipment

[0004] The second way of mixing polychromatic light is to use color filters to combine light, and its structural principle is as follows: figure 2 As shown, its principle is similar to that of the X-CUBE color combining prism, and the light filtering is also realized by coating a high-pass filter film or a low-pass filter film. This structure has the following disadvantages: (1) The angle of the color filter The fixed requirements are very high, and the light paths of the three color lights are different, such as figure 2 The optical path of medium-red light is the shortest, resulting in reddish synthetic light; (2) Using multiple color filters, the production cost is relatively high

[0005] The third way of mixing polychromatic light is to use a light mixing column (also called an integrating lens), and its structural principle is as follows: image 3 As shown, in this structure, if the uniformity of light mixing needs to be improved, the light mixing column needs to be long enough, but this will significantly increase the volume of the system, and the light is not easy to collimate, which is not conducive to the design of the projection module

But this method requires multiple prisms, but the disadvantage is obvious, increasing the number of prisms, thereby increasing the cost; and increasing the volume, and also increasing the weight of the system

Most importantly, this design is only suitable for the thin beam color mixing of laser light sources, not suitable for light sources with a certain divergence angle such as LEDs

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