In an effort to flatten the front face of the front lens as much as possible, it has been proposed to enlarge the lenses in the objective portion on the side of the object, particularly the front lens, by widening the path of the bundle of rays. results in considerable manufacturing difficulties and also makes it quite difiicult to clean the front surface of the objective after its use. It is known that the first radius of the front lens meniscus becomes very small in strong microscope objectives of the described type. and the negative and positive lenses constitute the objective portion on the side of the image. In this manner, the front lens and the additional lenses constitute the obiective portion on the side of the object. The negative lens of said correction lens defines an air space with the last additional lens and the negative and positive lenses of said correction lens define air spaces therebetween, each of the latter two air spaces having an axial length at least twice the focal length of the objective. two of the additional lenses following a concavo-convex front lens of considerable thickness consist each of two cemented components, and the negative correction lens is split into a negative lens and a positive lens. The advantages of the present invention are accomplished by a modification of this optical system wherein at least. 924,539, for instance, a negative lens on the side of the image follows the two additional lenses on the side of the object, the spacing of the negative lens from the preceding lens being more than twice the focal length of the objective and the negative lens being designed primarily to correct the astigmatism of the objective. In the objective shown in German Patent No. G02B- OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS.238000006011 modification reaction Methods 0.000 description 1.238000004519 manufacturing process Methods 0.000 description 1.230000004323 axial length Effects 0.000 claims description 8.Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Priority to DEL43109A priority Critical patent/DE1184981B/en Application filed by Ernst Leitz GmbH filed Critical Ernst Leitz GmbH Priority claimed from US04/664,969 external-priority patent/US4009945A/en Application granted granted Critical Publication of US3380793A publication Critical patent/US3380793A/en Anticipated expiration legal-status Critical Status Expired - Lifetime legal-status Critical Current Links Original Assignee Ernst Leitz GmbH Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number Inventor Klein Walter Current Assignee (The listed assignees may be inaccurate.
#Ernst leitz wetzlar microscope objective pdf#
Google Patents US3380793A - Microscope objectiveĭownload PDF Info Publication number US3380793A US3380793A US30675963A US3380793A US 3380793 A US3380793 A US 3380793A US 30675963 A US30675963 A US 30675963A US 3380793 A US3380793 A US 3380793A Authority US United States Prior art keywords lens lenses additional air space image Prior art date Legal status (The legal status is an assumption and is not a legal conclusion.
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