| 摘要 |
A semi-apochromatic or apochromatic objective lens system for fluorescence microscopes comprising: a first lens unit which comprises a cemented lens component consisting of a meniscus lens element having a concave surface on the object side and a positive refractive power or a plano-convex lens element, and a meniscus lens element having a concave surface on the object side; a second lens unit which comprises a plurality of cemented lens components; and a third lens unit composed of a cemented lens component which consists, in order from the object side, of a positive lens element and a negative lens element, and has a weak refractive power, This objective lens system has a medium to high magnificaiton and a large numerical aperture, thereby being capable of forming an image having high resolution and high contrast.
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