| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lighting device with a further improved light use efficiency than a prior art. <P>SOLUTION: The lighting device 100 includes a light source device 110 emitting light, a first lens array 120 with a plurality of first micro lenses 122, a second lens array 130 with a plurality of second micro lenses 132 corresponding to the plurality of first micro lenses 122, and a superposing lens 150 for superposing light from the second lens array 130. In the lighting device 100, when a point where light passing through the first micro lenses 122 most gathers is a focussed point, a curvature of the first micro lens 122 is set for each lens 122 so that the focussed point is to be positioned in, or in the vicinity of, a given optical element which is situated further toward rear steps than the first lens array 120. <P>COPYRIGHT: (C)2013,JPO&INPIT |
