| 摘要 |
<p>To make less visible a dark line (DL) resulting from a central axis of a cross-dichroic prism, the upper portion (120u) and lower portion (120d) of a first lens array (120) may be relatively offset from each other in an x direction. A second lens array (130) is also offset correspondingly to the first lens array. Since an angle at which a partial light beam L32 (L32a, L32b) transmitted through the upper portions of the first and second lens arrays illuminates an area of illumination 252a is different from an angle at which a partial light beam L42 (L42a, L42b) transmitted through the lower portions of the first and second lens arrays illuminates the area of illumination 252a, dark lines generated by these partial light beams appear in different positions on a screen (7). With this arrangement, the dark lines resulting from the centre line of a cross-dichroic prism (4) are made less visible. <IMAGE></p> |
