Immersion microscope objective lens system
Patent 5982559 Issued on November 9, 1999. Estimated Expiration Date: 
January 27, 2018. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
January 27, 2018. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesMicroscope objective lens Objective lens system for microscope Immersion-type microscope objective lens Patent #: 5798869 InventorAssigneeApplicationNo. 014410 filed on 01/27/1998US Classes:359/656Microscope objectiveExaminersPrimary: Sugarman, Scott J.Attorney, Agent or FirmInternational ClassG02B 021/02Foreign Application Priority Data1997-01-28 JPAbstractThe immersion microscope objective lens system of the present invention provides a numerical aperture of 1.3, a magnification of 40×, a planatic image field even in the wide field of view and appropriately compensates for all aberrations. The immersion microscope objective lens system of the present invention comprises a structure including a plurality of lens groups G1 through G8 arranged along a common optical axis wherein the first lens group G1 from the object side of the lens system includes a planoconvex lens and a meniscus lens cemented to the planoconvex lens with its convex surface facing toward the image side of the lens system and wherein the second lens group G2 includes two positive meniscus lenses having convex surfaces facing toward the object side of the lens system and wherein the following condition is fulfilled: that n2 is larger than 1.70 where n2 is the refractive index in relation to the "d" line of the meniscus lens of the first lens group G1 (λ=587.6 nm). | |
