| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an illumination device having a constitution which is low in cost and simple in constitution, and capable of reducing visibility in an interference fringe, and to provide a projection type image display device. <P>SOLUTION: The illumination device 1a includes: a laser light source 10; and an optical member (for example, a fly-eye lens 12 and a condenser lens 13) that spatially divides incident light based on emitted light from the laser light source 10, multiplexes the divided light along a predetermined direction (multiplexing direction) toward an emitting surface and emits the multiplexed light. An axial direction of the light entering the fly-eye lens 12 in which coherency is high and directions of multiplexing by the condenser lens 13 are different from one another, and thereby it is possible to prevent the light divided by the fly-eye lens 12 from being multiplexed along the axial direction in which the coherency is high in the condenser lens 13. <P>COPYRIGHT: (C)2011,JPO&INPIT |
