| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an indoor illuminating device capable of providing bright illumination with a small number of semiconductor light emitting devices which are low-cost and low-electric power consumption. <P>SOLUTION: The indoor illuminating device is provided with a bulk type lens 20 having a bottom part 7, an outer circumferential part 9, a top part 3 used as a lens surface and a recessed part 6 consisting of a ceiling part 2 formed from the bottom part to the top part and an inner circumferential part 5 and so structured that the ceiling part functions as a first lens plane; the inner circumferential part, as a plane of light incidence; an outer circumferential part, as a total reflection plane; the bottom part, as a reflection plane; and a top part, as a second lens plane, and a light source 1 stored in the recessed part of the bulk type lens via an optical medium. The light source is stored in a storing part via the optical medium of which refractive index is higher than the bulk type lens and a luminous flux of the light source is focused and radiated by using the bulk type lens. <P>COPYRIGHT: (C)2009,JPO&INPIT |
