Microscope objective

Details Microscope objective Microscope objective

1993-12-09

1995-08-22

Sugarman, Scott J.

Optical: systems and elements

Lens

Microscope objective

359661, G02B 2102

Patent

active

054445736

ABSTRACT:
An apochromatic microscope objective of high NA wherein variation of aberrations, including chromatic aberration, caused by a change in the cover glass thickness, is minimized with a relatively simple arrangement. The microscope objective has a 1-st lens unit (G.sub.1) which includes a positive meniscus lens having a concave surface directed toward the object side to convert a bundle of rays from an object into a convergent bundle of rays, a 2-nd lens unit (G.sub.2) having a negative refractive power, and a 3-rd lens unit (G.sub.3) having a small refractive power. The 2-nd lens unit (G.sub.2) is movable relative to the 1-st and 3-rd lens units (G.sub.1 and G.sub.3) along the optical axis in accordance with a change in thickness of a transparent plane-parallel plate disposed between the 1-st lens unit (G.sub.1) and the object. The microscope objective satisfies conditions concerning the curvature radius of a lens surface in the 1-st lens unit (G.sub.1) that is the closest to the object side and the focal lengths of the 2-nd and 3-rd lens units (G.sub.2 and G.sub.3).

REFERENCES:
patent: 2206155 (1940-07-01), Boegehold
patent: 3912378 (1975-10-01), Goto
patent: 4379623 (1983-04-01), Rybicki
patent: 4417787 (1983-11-01), Danner

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