Microscope objectives lens
Patent 6392814 Issued on May 21, 2002. Estimated Expiration Date: 
July 3, 2021. 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.
July 3, 2021. 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 Microscope objective lens system with correction ring Objective lens system for a microscope Patent #: 5861996 InventorAssigneeApplicationNo. 897398 filed on 07/03/2001US Classes:359/661, Having less than four components359/356, Infrared lens359/656Microscope objectiveExaminersPrimary: Nguyen, ThinhAttorney, Agent or FirmForeign Patent References
International ClassesG02B 021/02G02B 013/14 Foreign Application Priority Data2000-07-05 JPAbstractA microscope objective lens of the present having, in the order from the object side, a first lens group, a second lens group and a third lens group. The first lens group comprises a meniscus lens with its concave surface facing the object side and a plurality of cemented lenses, and has a positive refractive power on the whole. The second lens group comprises a plurality of cemented lenses and has a positive refractive power on the whole. The third lens group comprises a plurality of cemented lenses and having a negative refractive power on the whole, and fulfills the following conditions (1) to (3):2.5<f1/f<5 (1)30<f2/f<70 (2)15<|f3/f|<30 (3)where f1 is the focal length of the first lens group, f2 is the focal length of the second lens group, f3 is the focal length of the third lens group, and f is the focal length of the whole microscope objective lens system.Field of SearchMicroscopeIlluminator Including continuously variable magnification or focal length (zoom lens, adjustable lens) Lens, lens system or component Infrared lens Having four or more components Microscope objective Having seven components Having six components Having five components Having four components Having less than four components Three groups | |
