| 摘要 |
<p>A projection optical system 130 for a liquid crystal projector having a plurality of lenses and projecting an image from liquid crystal display devices onto a screen 110 includes a front lens portion 131 which may have a meniscus lens, a first concave lens, a convex lens and a second concave lens sequentially arranged from the furthermost of an image plane; and a rear lens portion 132 having two piano-convex lenses positioned between the front lens portion and image plane (display screen) 110, optionally with the flat surfaces thereof facing the image plane. The projection optical system is focused by adjusting the distance between the front and rear lens portions. <IMAGE></p> |
