US 4,373,785 AGrant
Microscope Objective
Issue Date:1983-02-15
•2 Claims
•1 Drawing Sheets
Abstract
A eight component, oil-immersion, apochromatic microscope objective has a numerical aperture of 1.30. When used with a telescope as described in U.S. Pat. No. 3,355,234, the objective provides a magnification of 100 X in an embodiment having a focal length of 1.824 mm and is well corrected for the usual chromatic image aberrations, spherical aberration, coma and astigmatism.
Metadata
Assignee
- Warner Lambert Technologies, Inc.
Inventor
- Arthur H. Shoemaker
Application Information
Application Number:US 2563258
Filing Date:1981-04-22
Priority Date:1981-04-22
Art Unit:257
Classifications
IPC:
G02B 2102
Field of Search:
350414
Patent Drawings (1 sheets)
Description
Background of the Invention
This invention relates to microscope objectives and more particularly to apochromatic microscope objectives having a numerical aperture of substantially 1.30 and a magnification of 100X, when used with a telescope objective as described in U.S. Pat. No. 3,355,234 and having a focal length of 1.824 mm.
Microscope objectives according to this invention are well corrected for the usual chromatic image aberrations, spherical aberration, coma and astigmatism when used with a telescope objective and have a substantially flat image field.
U.S. Pat. No. 3,700,311, issued Oct. 24, 1972, discloses an eight element, oil-immersion, apochromatic microscope objective having an N.A. of 1.30. The specific ranges of curves, thicknesses, spacings, indices of refraction and Abbe numbers, as well as the preferred embodiments are different, although the general configuration is the same as that of the present invention.
Description of the Drawing and Invention
The drawing is an optical diagram of an embodiment of the present invention .
Referring to the drawing, objective XX is shown in a view transverse to its optical axis relative to object plane 0 and illustrates the lens components aligned along the optical axis. The first component I of objective XX is a plano-convex positive doublet followed by a concavo-convex positive singlet II. A biconvex positive doublet III is next succeeded by a concavo-convex positive doublet IV and a convex-concavo positive doublet V. A biconvex positive doublet VI, convex-concavo negative singlet VII and concavo-convex positive singlet complete objective XX.
The parameters of objectives according to the present invention are set forth in Table I, wherein successive axial spaces are identified as S.sub.1 to S.sub.8 and axial thicknesses of successive lens elements are identified as T.sub.1 to T.sub.14. The radii of successive lens surfaces are designated R.sub.1 to R.sub.22 with the minus sign (-) being applied to the radius of a surface whose center of curvature lies on the object side of its vertex. The refractive indices and Abbe numbers of the successive lenses are absolute values designated ND.sub.1 to ND.sub.14 and .nu..sub.1 to .nu..sub.14 successively.
wherein F is 1.80 to 1.85 mm.
A preferred embodiment of the present invention wherein F is 1.824 has the following parameters.
Claims
What is claimed is:
1. An eight component, oil immersion apochromatic objective having an N.A. of 1.30 which has a plano-convex doublet I, a concavo-convex singlet II, a biconvex doublet III, a concavo-convex doublet IV, a convex-concavo doublet V, a biconvex doublet VI, a convex-concavo singlet VII and a concavo-convex doublet VIII having the parameters of the respective axial spacings (S.sub.0 -S.sub.8) in mm, radii (R.sub.1 -R.sub.22), in mm with a minus sign (-) indicating a center of curvature on the object side of the lens, thickness (T.sub.1 -T.sub.14) in mm, indices of refraction (ND.sub.1 -ND.sub.14) and Abbe numbers (.nu..sub.1 -.nu..sub.14) are absolute values, all being determined by the following table: RefractiveAbbe RadiusThicknessSpacingIndexNo Lens(R)(T)(S)(ND)(.nu.) ______________________________________ S.sub.1 =0.154F R.sub.1 =.infin. T.sub.1 =0.313F1.535<ND.sub.1 <1.54550.5<.nu..sub.1 <51.5 IR.sub.2 =-0.583F T.sub.2 =1.568F1.88<ND.sub.2 <1.8941.5<.nu..sub.2 <42.5 R.sub.3 =-1.356F S.sub.2 =0.011F R.sub.4 =-9.156F IIT.sub.3 =1.118F1.78<ND.sub.3 <1.7950<.nu..sub.3 <51 R.sub.5 =-3.632F S.sub.3 =0.291F R.sub.6 =8.123F T.sub.4 =0.658F1.715<ND.sub.4 <1.72534<.nu..sub.4 <35 IIIR.sub.7 =4.399F T.sub.5 =2.577F1.43<ND.sub.5 <1.4495<.nu..sub.5 <96 R.sub.8 =-4.399F S.sub.4 =0.252F R.sub.9 =-21.809F T.sub.6 =0.658F1.65<ND.sub.6 <1.6639<.nu..sub.6 <40 IVR.sub.10 =3.907F T.sub.7 = 2.248F1.43<ND.sub.7 <1.4495<.nu..sub.7 <96 R.sub.11 =7.204F S.sub.5 =0.055F R.sub.12 =5.212F T.sub.8 =2.193F1.43<ND.sub.8 <1.4495<.nu..sub.8 <96 VR.sub.13 =-5.869F T.sub.9 =0.658F1.715<ND.sub.9 <1.72534<.nu..sub.9 <35 R.sub.14 =10.204F S.sub.6 =0.055F R.sub.15 =6.014F T.sub.10 =1.919F1.43<ND.sub.10 <1.4495<.nu..sub.10 <96 VIR.sub.16 =-6.014F T.sub.11 =0.658F1.715<ND.sub.11 <1.72534<.nu..sub.11 <35 R.sub.17 =-6.014F S.sub.7 =0.055F R.sub.18 =6.272F VIIT.sub.12 =2.193F1.62<ND.sub.12 <1.6346.5<.nu..sub.12 <47.5 R.sub.19 =3.098F S.sub.8 =1.069F R.sub.20 =-2.209F T.sub.13 =0.987F1.785<ND.sub.13 <1.79547<.nu..sub.13 <48 VIIIR.sub.21 =3.410F T.sub.14 =1.645F1.78<ND.sub.14 <1.7925.5<.nu..sub. 14 <26.5 R.sub.22 =-5.943F ______________________________________ wherein R is 1.80 to 1.85 mm.
2. The microscope objective according to claim 1 wherein F is 1.824, ND.sub.1 is 1.540, ND.sub.2 is 1.883, ND.sub.3 is 1.786, ND.sub.4, ND.sub.9 and ND.sub.11 are 1.720, ND.sub.5, ND.sub.7, ND.sub.8 and ND.sub.10 are 1.434, ND.sub.6 is 1.654, ND.sub.12 is 1.624, ND.sub.13 is 1.788, ND.sub.14 is 1.784, .nu..sub.1 is 51.1, .nu..sub.2 is 40.8, .nu..sub.3 is 50.2, .nu..sub.4, .nu..sub.9 and .nu..sub.11 are 34.6, .nu..sub.5, .nu..sub.7, .nu..sub.8 and .nu..sub.10 are 95.6, .nu..sub.6 is 39.6, .nu..sub.12 is 47, .nu..sub.13 is 47.4 and .nu..sub.14 is 26.1.
Patent Citations (2)
| Patent | Date | Inventor | Cited By |
|---|---|---|---|
| US3355234 | 1967-11-01 | Muller | |
| US3700311 | 1972-10-01 | Shoemaker |