Microscope objective lens

Details Microscope objective lens Microscope objective lens

1997-02-25

1998-12-01

Pihulic, Daniel T.

Optical: systems and elements

Lens

Microscope objective

G02B 2102

Patent

active

H00017639

ABSTRACT:
Apochromatic-type microscope objective lenses are disclosed having a high numeral aperture number with few component lenses. The objective lenses are operable to correct any of various aberrations arising due to use of the objective lens with cover glasses having variable thickness. The objective lenses comprise a first positive lens group comprising a positive meniscus lens with a concave surface facing objectwise, a second positive lens group comprising a positive cemented lens in which the cemented surface has negative refractive power and a negative cemented lens in which the cemented surface has positive refractive power, and a third (negative) lens group comprising at least one cemented lens. The second and third lens groups are movable on the optical axis relative to the first lens group so as to facilitate correction of aberrations arising from use of cover glasses having variable thickness.

REFERENCES:
patent: 3799680 (1974-03-01), Weisner
patent: 4666256 (1987-05-01), Shimizu et al.
patent: 5444573 (1995-08-01), Saito
patent: 5532878 (1996-07-01), Suenaga et al.
English Abstract of Japanese reference No. 61-275,812, issued on Dec. 5, 1986.
English Abstract of Japanese reference No. 5-50517, issued on Mar. 5, 1991.
English Abstract of Japanese reference No. 5-119263, issued on May 18, 1993 .

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