Optical: systems and elements – Lens – Microscope objective
Patent
1997-10-30
1999-03-30
Epps, Georgia
Optical: systems and elements
Lens
Microscope objective
359659, 359660, 359791, G02B 2102
Patent
active
058896180
ABSTRACT:
An inexpensive achromatic object lens for a microscope has a magnification of about 20 and a relatively long working distance. Aberrations are satisfactorily corrected even at the periphery of the image. The object lens includes a first lens group having a positive refractive power, a second lens group having a positive refractive power, and a third lens group having a negative refractive power in this order from the object side. The first lens group consists of a positive lens and a cemented lens which is composed of a negative lens and a positive lens. The second lens group consists of a positive lens for converting the divergent light flux that has exited the first lens group into convergent light flux. The third lens group consists of a negative meniscus lens with its concave surface facing the image side. The object lens satisfies the conditions 4.0.ltoreq.f1/d0.ltoreq.15.0, 55.ltoreq.v2p, and 35.ltoreq.v1p-v1n.
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Epps Georgia
Lester Evelyn A.
Nikon Corporation
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