Optical: systems and elements – Lens – Microscope objective
Patent
1996-10-15
1998-06-30
Nelms, David C.
Optical: systems and elements
Lens
Microscope objective
359656, 359775, 359776, 359777, 359778, G02B 300, G02B 936
Patent
active
057742723
ABSTRACT:
Low-power objective lenses for a microscope are disclosed. The objective lenses exhibit apochromatic optical performance at a numerical aperture of at least 0.1 and have a magnification of about 2.times. or less. Each such objective lens comprises, in order from the object side, a first lens group having positive refractive power; a second lens group having negative refractive power and comprising a negative meniscus lens with a concave surface oriented toward the image side; a third lens group having negative refractive power and having at least one cemented surface; and a fourth lens group having positive refractive power and comprising a positive meniscus lens element with a convex surface oriented toward the image side, and a positive cemented lens including a negative lens element cemented to a positive lens element. The objective lenses satisfy the condition: 1.2<f.sub.1 /D.sub.1 <2.3 and other conditions, wherein f.sub.l is focal length of the first lens group and D.sub.1 is the axial distance from a lens surface in the first lens group closest to the image side to a lens surface in the second lens group closest to the object side.
REFERENCES:
patent: 4501474 (1985-02-01), Kimura
Lester Evelyn A.
Nelms David C.
Nikon Corporation
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