| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an LED illuminating device can enhance light-extraction efficiency and restrain generation of color shading. <P>SOLUTION: The LED illuminating device is provided with a light source 1 with a plurality of LED chips 10 with different emission wavelengths, a face sheet 2 made of a diffusion reflection sheet of a rectangular plate shape with a number of opening parts 21 for light extraction formed and arranged so as its thickness direction to coincide with a light axis M1 of the light source 1, a rear sheet 3 arranged in opposition to the face sheet 2 at a side contrary to a light-irradiating face of the face sheet 2 and made of a diffusion reflection sheet of a rectangular plate shape diffusing and reflecting light diffused and reflected at the face sheet 2 toward a face sheet 2 side, and a spacer 4 of a frame shape (here, a rectangular frame shape) intercalated between the face sheet 2 and the rear sheet 3. A medium 5 between the face sheet 2 and the rear sheet 3 is air, and the face sheet 2 has each opening part 21 formed so that direct light from the light source 1 shall not irradiate outward and luminance at a light-irradiating face side shall be uniform. <P>COPYRIGHT: (C)2010,JPO&INPIT |
