Polycarbonate-substrate hard back-projection screen for edge blending
A technology of polycarbonate and edge fusion, applied in projection devices, instruments, optics, etc., can solve problems such as the inability to use the rear projection screen, the inability to ensure the normal operation of the fusion belt, and the insufficient light diffusion ability of the light diffusing agent. The effect of simple processing technology, good gain and easy installation
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Embodiment 1
[0013] Using aromatic polycarbonate, light diffusing agent particles and transparent black masterbatch as raw materials, it is processed by plastic extrusion technology, and its characteristics are: the surface roughness of the roll used is 10μm~100μm, and the light diffusion factor FD≥0.95, The larger the value of the diffusion factor FD, the stronger the diffusion ability, and the more suitable for high-lumen short-focus projectors to project seamless super-large images in a fusion manner, that is, the half-gain viewing angle of the screen can only be used for edge fusion when it reaches 55 degrees or more. .
[0014] The FD=(no-n)*Dp*h / d, where:
[0015] no-n: The difference between the optical refractive index no of the light diffusing agent and the optical refractive index n of the aromatic polycarbonate is ±0.03~±0.09, and is calculated by absolute value in the formula;
[0016] Dp: mass percentage of light diffusing agent, 1.5~3.5%;
[0017] h: screen thickness, 1.0~3...
Embodiment 2
[0025] Raw material is with embodiment 1.
[0026] The mass percentage of each component is as follows: 94.5% aromatic polycarbonate, 3.5% light diffusing agent, 2% transparent black color masterbatch, the difference between the light refractive index of light diffusing agent and the light refractive index of aromatic polycarbonate The difference is 0.09.
[0027] The production method is the same as in Example 1, and the thickness of the product produced by the extrusion process is 1.0 mm, and the width of the plate is 2.3 m.
[0028] Calculated according to the formula FD=(no-n)*Dp*h / d, the diffusion factor FD is 1.05. After testing: the gain of the obtained product is 0.70, and the half-gain viewing angle (diffusion angle) is 60 degrees. This screen is suitable for brightness between 2500- Projectors between 4000 lumens work in fusion.
Embodiment 3
[0030] Raw material is with embodiment 1.
[0031] The mass percentage of each component is as follows: aromatic polycarbonate 96.0%, light diffusing agent 2.6%, transparent black masterbatch 1.4%.
[0032] The production method is the same as in Example 1, and the product produced by the extrusion process has a thickness of 2.1 mm and a plate width of 2.3 m.
[0033] Calculated according to the formula FD=(no-n)*Dp*h / d, the diffusion factor FD is 1.638. After testing: the gain of the obtained product is 0.55, and the half-gain viewing angle (diffusion angle) is 70 degrees. This screen is suitable for brightness between 6500~ Projectors between 9000 lumens work in fusion.
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