| 摘要 |
A projection lens system including seven lens elements for use in a projection television which comprises, in order from the screen side, a first lens unit composed of a positive lens element, a second lens unit composed of an aspherical lens element made of plastic in a meniscus form having at least one aspherical surface, a third lens unit composed of a concave lens element, a fourth lens unit composed of a positive cemented lens having a convex surface on both sides, a fifth lens unit composed of a positive lens element made of plastic in meniscus form having at least one aspherical surface, and a sixth lens unit composed of a negative lens element which has a concave surface directed toward the screen, the sixth lens unit being made of a plastic lens in meniscus form having at least one aspherical surface.
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