| 摘要 |
A projection lens system includes a first lens group for correcting spherical aberration and coma aberration, a second lens group for correcting chromatic aberration, a third lens group for providing the main optical power for the whole system, and a fourth lens group for correcting petzval aberration. The first, second and third lens groups are sequentially disposed forward of a screen in front of a dichromatic mirror, and the fourth lens group is disposed between the CRTs and dichromatic mirror. Further, the fourth lens group and CRTs form an enclosure and are filled with transparent cooling oil, thereby accomplishing a high-resolution color image having no chromatic aberration and using a reduced number of lenses.
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