| 摘要 |
PURPOSE: To provide a liquid immersion microscope objective lens for which a magnification is set about from 40 times to 60 times, operating distance is comparatively long, the flatness of an image is improved as well, the number of openings is large about from 0.8 to 0.95 and the diameter of an objective lens top end is made fine ans sharp while maintaining satisfactory image formation performance. CONSTITUTION: This objective lens is composed of a 1st lens group G1 of positive refracting power, which is arranged on the most-object side and provided with the joint lens of a positive lens component and a meniscus lens component turning its concave surface toward the object side, and a 2nd lens group G2 of negative refracting power and satisfies the conditions as follows; d2 <|r2|<4.5F and|r1 /F|>7. In this case, F is the focal distance of an entire system, r1 and r2 are the curvature radius of the lens surface on the most-object side of the joint lens and the curvature radius of a joint surface, and d2 is the central thickness of the meniscus lens component arranged on the image side of the joint lens.
|
