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US 4,054,369 AGranted
Four-component microscope objective
AssigneeAmerican Optical Corporation
InventorArthur H. Shoemaker
Life of this patent
Estimating the term…
Abstract
A four-member microscope objective having a numerical aperture of 0.25 provides a magnification of substantially 10.times. and a substantially flat image field of 24mm in combination with a telescope objective as described in U.S. Pat. No. 3,355,234 and a typical 10.times. eyepiece.
Claims3
A microscope objective having a numerical aperture of 0.25 which consists of, in alignment along an optical axis, a biconcave negative singlet I, a positive meniscus singlet II concave to the object side, a biconvex positive singlet III and a biconvex positive doublet IV consisting of a negative meniscus and a positive biconvex lens
Dependencies are inferred from the claim text.