| 摘要 |
PROBLEM TO BE SOLVED: To correct various aberration well from a visible region to an infrared region in a microscope objective lens of which magnification is from four times to about ten times. SOLUTION: The microscope objective lens is composed of a first lens group including at least one cemented lens, and a second lens group including at least one cemented lens in order from an object side. The cemented lens of the first lens group comprises a positive lens and a negative lens directing a concave face to an image side. The cemented lens of the second lens group comprises a negative lens and a positive lens directing a plane or a concave face to the image side. A next condition (1) to a condition (5): (1)ν<SB>d</SB>(L1p)-ν<SB>d</SB>(L1n)>20, (2)ν<SB>d</SB>(L2p)>75, (3) -0.007<äθCt(L2p)-θCt(L2n)}/äν<SB>d</SB>(L2p)-ν<SB>d</SB>(L2n)}<0, (4) 15<f<55, and (5) ¾f(L2)/f¾<4 are satisfied. COPYRIGHT: (C)2006,JPO&NCIPI
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