| 摘要 |
A Fourier transform lens system includes a first lens group having positive power, a second lens group having positive power, and a third lens group having negative power, all arranged on a common optical axis in that sequence. The first lens group includes a first positive meniscus lens, and a negative meniscus lens adjacent to the second lens group. The first positive meniscus lens has a concave lens surface facing toward a concave lens surface of the negative meniscus lens. The second lens group includes at least one bi-convex lens. The third lens group includes a second positive meniscus lens adjacent to the second lens group and a bi-concave lens. The second positive meniscus lens has a convex lens surface facing toward the second lens group. The Fourier transform lens system satisfies the following conditions: (1) 0.8<F<SUB>2</SUB>/f<1.4; (2) -1.3<R<SUB>12F</SUB>/f<-0.7; (3) 0.35<R<SUB>31F</SUB>/f<0.75; and (4) 0.3<R<SUB>32R</SUB>/f<0.7.
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