Optical sheet and surface light source apparatus
An optical sheet and one-sided technology, applied in the direction of electroluminescent light source, optics, light source, etc., can solve the problem of increased light loss, achieve the effect of small color change, reduce surface unevenness, and improve light extraction efficiency
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[0170] (Example 1)
[0171] (1-1. Coating liquid (1))
[0172] The resin (UV curable resin with urethane acrylate as the main component, refractive index 1.54 after curing) is added as the first diffuser particles with a number average particle diameter of 4.5 μm (silicone resin, refractive index 1.43) , Stirring was performed to disperse the particles, and a coating liquid (1) that became a material of the light diffusion layer was prepared. The content ratio of the particles was set to 50% by weight in the total amount of the coating liquid (1).
[0173] (1-2. Coating liquid (2))
[0174] Dissolve a resin mainly composed of acid-modified polyolefin polymer (refractive index 1.48) as a binder in a solvent that is a mixture of methylcyclohexane and ethyl acetate at an 8:2 (weight ratio), Furthermore, as the second diffusion particles, particles with a number average particle diameter of 0.6 μm (silicone resin, refractive index 1.43) and zirconia particles (number average particle di...
Example Embodiment
[0200] (Example 2)
[0201] In step (1-1), as the first diffusion particles, instead of particles with a number average particle diameter of 4.5 μm, particles with a number average particle diameter of 1.7 μm (silicone resin, refractive index 1.43) were used. The steps (1-1) to (1-9) of Example 1 were carried out in the same manner, and optical sheets, surface light source devices, and other research samples were produced and evaluated. The results are shown in Table 1.
[0202] In this embodiment, the thickness of the light diffusion layer obtained in the step (1-5) is 15 μm, and an uneven structure with Ra=0.3 μm is formed on the surface.
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