Immersion-type microscope objective lens

Details Immersion-type microscope objective lens Immersion-type microscope objective lens

1996-10-28

1998-08-25

Epps, Georgia Y.

Optical: systems and elements

Lens

Microscope objective

359656, G02B 2102

Patent

active

057988692

ABSTRACT:
An apochromatic, immersion-type microscope objective lens is disclosed, comprising (in order from the object side) a first lens group having positive refractive power, a second lens group having a positive refractive power, and a third lens group having a negative refractive power. The first lens group comprises a planoconvex lens element (having refractive index n.sub.1) as the most objectwise lens element in the objective lens. The planoconvex lens element is "embedded" in and cemented to a negative meniscus lens having a refractive index n.sub.2 and a convex surface oriented imagewise. Also in the first lens group is a positive meniscus lens element having a concave surface oriented objectwise. The second lens group comprises at least one compound lens. The third lens group comprises a cemented meniscus lens having a concave surface oriented imagewise. The objective lens satisfies Conditional Expressions including n.sub.2 -n.sub.1 .gtoreq.0.2.

REFERENCES:
patent: 4232940 (1980-11-01), Nakagawa
patent: 5502596 (1996-03-01), Suzuki
patent: 5532878 (1996-07-01), Suenaga et al.

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