Optical projection system

Abstract

The provided optical projection system comprises; a light source, a beam-splitting unit with multiple guide-light surfaces, a reflection color wheel with multiple filters, a color-light adjust unit, and a projection lens. Wherein, when traveling to the guide-light surfaces from source, the beam can be splitted into multiple secondary beams toward the wheel, and the filter has some opposite blocks to reflect the secondary beams to the adjust unit and generate an image beam for projection.

Description

technical field [0001] The invention relates to an optical projection system, in particular to an optical projection system capable of reducing light energy loss. Background technique [0002] As shown in Figures 1 and 2, it is an existing optical projection system, which includes a light source 1 that can project a light beam 101, a light guide 2 (Light Tunnel) that can guide and collect light, a rotatable and has a plurality of A transmissive color wheel 3 (Color Wheel), a digital micromirror chip 4 (Digital Micro-mirrorDevice, DMD), and a screen 5 in a spirally distributed color zone 301, the color zone 301 of the color wheel 3 is The red (R), blue (B) and green (G) three-color cycle configuration is sequentially arranged. When the light beam 101 passes through the light guide 2 and is projected onto the three-color area 301 of the color wheel 3, with the rapid rotation of the color wheel 3, the color wheel 3 can make red (R), blue (B) ), green (G) three-color light cyc...

AI Technical Summary

Problems solved by technology

[0004] One, such as figure 2 As shown, when the light beam 101 passes through the light guide 2 and is projected onto the three color regions 301 of the color wheel 3, although each color region 301 can provide red (R), blue (B), green ( G) one of the three colors of light passes through, but the light beam 101 is projected to the part of the red (R) color zone 301, except that the red (R) color light can pass through the red (R) color zone 301, and the blue ( B) color light and green (G) color light will all be reflected, similarly, blue (B) color area 301 and green (G) color area 301 will also have similar problems, and will reflect other color lights respectively , in this way, not only will it cause loss of light energy, but also affect the brightness performance of the screen 5 picture

[0005] 2. Although the above-mentioned colored light reflected by the color zone 301 can be recovered by the light guide 2 and then projected onto the color wheel 3, in fact, only a small part of the reflected colored light can pass through the light guide again 2 and re-projected onto the color wheel 3, therefore, the reflected color light tends to make the light guide 2 prone to overheating, thus shortening the service life of the light guide 2 and affecting the quality of the entire optical system

[0006] 3. The light source 1, light guide 2, color wheel 3 and digital micromirror chip 4 of the optical projection system are arranged along a straight line, and the light guide 2 is spaced between the light source 1 and the color wheel along the straight line 3 and has a certain length, therefore, this kind of optical projection system is often bulky and takes up more space

[0007] like image 3 As shown, there are also people who use another transmissive color wheel 6 with three fan-shaped color zones 601 to replace the above-mentioned color wheel 3, but the color zones 601 are also only available for the red (R) of the light beam 101 respectively. , blue (B), green (G) one of the three-color light passes through, therefore, the color zone 601 will also produce the absence of the above-mentioned color zone 301 reflecting other color light

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