Dry-type microscope objective lens

Details Dry-type microscope objective lens Dry-type microscope objective lens

2011-07-19

2011-07-19

Sugarman, Scott J (Department: 2873)

Optical: systems and elements

Lens

Microscope objective

C359S661000

Reexamination Certificate

active

07982961

ABSTRACT:
The present invention offers a dry-type microscope objective lens which has a high NA in the range from low magnification to middle magnification and is lightweight and by which a high-resolution image can be obtained without taking a user time and trouble in observation.A dry-type microscope objective lens according to the present invention comprises, in order from the object side, a first lens group, a second lens group, and a third lens group, the first lens group comprises a meniscus lens which is arranged on the most object side and which turns its concave surface to the object side and the first lens group has positive refracting power as a whole, the second lens group comprises plural cemented lens units and has positive refracting power as a whole, the third lens group comprises air contact surfaces which are concave surfaces adjoining each other and facing toward each other and the third lens group has negative refracting power as a whole, and the dry-type microscope objective lens satisfies the following conditions:in-line-formulae description="In-line Formulae" end="lead"?6≦D/f≦8in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?5≦fin-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.8≦NA<1.0in-line-formulae description="In-line Formulae" end="tail"?where D is a distance from an object surface to the last surface of the objective lens, f is a focal length of the objective lens, and NA is an object-side numerical aperture.

REFERENCES:
patent: 5920432 (1999-07-01), Suenaga et al.
patent: 6501603 (2002-12-01), Kasahara
patent: 7382542 (2008-06-01), Wartmann
patent: 2008/0180805 (2008-07-01), Yonetani
patent: 11-249024 (1999-09-01), None
patent: 2005-189732 (2005-07-01), None
patent: 2007-133071 (2007-05-01), None

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