| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce color unevenness and restrain degradation of illuminance right under a light source when emission light irradiates an irradiation surface in a light emitting device. <P>SOLUTION: The light emitting device 1 includes a light source 2, and an optical lens 3 for controlling light distribution of emission light. The optical lens 3 includes a first lens 4 condensing emission light from the light source 2, and a second lens 5 with the condensed light as parallel light. The first lens 4 includes a first reflecting surface 42 with a cross section of a parabolic shape, which condenses light incident from an incident surface 41 to a condensing surface 43. The second lens 5 includes a second reflecting surface 52 with a cross section of a parabolic shape, which reflects light incident from a connection surface 51 with the condensing surface 43 to an emission surface as parallel light. With this structure, color unevenness of emission light is reduced by mixing light through condensing light onto the condensing surface 43 by the first reflecting surface 42, with the condensing surface 43 using as a pseudo light source, light from the condensing surface 43 is to be parallel light by the second reflecting surface 52 so as to enable to restrain degradation of illuminance right under the light source 2. <P>COPYRIGHT: (C)2013,JPO&INPIT |
