| 摘要 |
PROBLEM TO BE SOLVED: To provide a semi-apochromat class objective lens which has a high NA, a long working distance and large magnification. SOLUTION: The microscope objective lens is provided with a first lens group including at least two positive lenses which turned convex faces to an image side, a second lens group of three cemented lenses of positive, negative and positive, a positive third lens group, a fourth lens group consisting of a cemented meniscus lens and having a surface nearest and concave to the image side, and a fifth lens group including a cemented meniscus lens having a surface nearest and concave to the image side. The microscope objective lens satisfies the following conditions: (1) t5 +D<t4 , and (2) 0.2<r42 /r41 <0.7.
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