Objective lens system
November 23, 2013. 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 References 3700311 3879111 Microscope objective Objective lens system for microscopes Objective lens system for microscopes High zoom-ratio zoom lens system for use in a compact camera Objective lens system for microscopes UV-capable dry lens for microscopes Objective lens system for microscope High mangification objective lens system InventorAssigneeApplicationNo. 155917 filed on 11/23/1993US Classes:359/661, Having less than four components359/355, Lens, lens system or component359/357, Having four or more components359/656Microscope objectiveExaminersPrimary: Nguyen, ThinhAttorney, Agent or FirmForeign Patent References
International ClassesG02B 021/02G02B 013/14 Foreign Application Priority Data1990-05-15 JPAbstractA high resolution objective lens system for use in the ultraviolet region around 250 nm comprising in order from the object side: a first lens unit comprising a meniscus lens component having an object side concave surface having high curvature and a positive lens component, and having a positive refractive power as a whole; a second lens unit comprising at least two cemented lens components and having a positive refractive power as a whole; and a third lens unit comprising a cemented lens component and having a negative refractive power as a whole: each of the lens elements arranged in the lens units being made of an optical material which has, a thickness of at least 5 mm, and an internal transmittance of at least 50% for a ray having a wavelength of 300 nm.Other References
Field of SearchLENSOptically compensated Microscope objective Having seven components Having six components Having five components Having four components Having less than four components Three groups + - + Arrangement Three components With third component biconvex + + - Arrangement + + + Arrangement HAVING SIGNIFICANT INFRARED OR ULTRAVIOLET PROPERTY Lens, lens system or component Infrared lens Having four or more components | |
