| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce the cost and the size of the device by arranging the plate type polarized light separating mirrors, whose surfaces are set so that it is tilted to the optical axis of light beams, between picture displaying elements and a light source. SOLUTION: A PS converting unit 15 is used to take out only desired S wave, for example, from parallel light beams LP obtained from a reflection mirror 55 of a light source. When the beams LP are made incident on two polarized light separating mirrors 63, P wave pass the mirrors 63. However, S wave are reflected by the mirrors 63 and reachλ/4 plate mirrors 65. Then, the mirrors 65 reflect the S wave and send the S wave in parallel with an optical axis OP. On the other hand, the P wave passed the mirrors 63 are polarization converted to S wave by aλ/2 plate 67 and send out in parallel with the axis OP. Thus, only S wave are polarization separated from the beams LP and send to the first fly array lens side of a next stage.</p> |
