| http://www.w3.org/ns/prov#value | - The anti-reflection films 81 are formed on the upper surface of each package 71 and the entire light-incident surface 50a of the light-directing plate 50 with a film thickness of ??/4 (?? is a light-emitting wavelength of the LED) by vapor-depositing on them a material such as MgF2 having a refractive index of 1.2 to 1.4 by using an EB (Electron Beam) evaporation device.
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