| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve ambient illumination intensity in a light-emitting device using a solid light-emitting diode (LED) by allowing light to be irradiated toward a construction surface. <P>SOLUTION: A light-emitting device 1 includes: a solid light-emitting diode (LED 2); a substrate 3 configured to mount the LED 2 thereon; and an optical member 4 disposed in a light lead-out direction of the LED 2. The optical member 4 is disposed to cover the LED 2 and the substrate 3, and extends toward an outer periphery of the substrate 3 beyond a peripheral edge part thereof, and includes: an incidence surface 41 opposed to the LED 2; a first transmission surface 42 opposing the incidence surface 41; a total reflection surface 43 located closer to the outer periphery of the first transmission surface 42; and a second transmission surface 44 located closer to the outer periphery of the peripheral edge part of the substrate 3. According to this configuration, the light entered from the incidence surface 41 is outputted from the first transmission surface 42, or is subjected to total internal reflection by the total reflection surface 43, and is then outputted from the second transmission surface 44. Therefore, the light can be irradiated toward a construction surface of the light-emitting device 1, thereby improving ambient illumination intensity. <P>COPYRIGHT: (C)2013,JPO&INPIT |
