GB691530A - Improvements in or relating to optical systems - Google Patents
Improvements in or relating to optical systemsInfo
- Publication number
- GB691530A GB691530A GB26203/49A GB2620349A GB691530A GB 691530 A GB691530 A GB 691530A GB 26203/49 A GB26203/49 A GB 26203/49A GB 2620349 A GB2620349 A GB 2620349A GB 691530 A GB691530 A GB 691530A
- Authority
- GB
- United Kingdom
- Prior art keywords
- objective
- lens
- convex
- elements
- quartz
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/08—Catadioptric systems
- G02B17/0852—Catadioptric systems having a field corrector only
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/08—Catadioptric systems
- G02B17/0804—Catadioptric systems using two curved mirrors
- G02B17/0808—Catadioptric systems using two curved mirrors on-axis systems with at least one of the mirrors having a central aperture
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B21/00—Microscopes
- G02B21/02—Objectives
- G02B21/04—Objectives involving mirrors
Abstract
691,530. Reflecting objectives. INTERNATIONAL POLAROID CORPORATION. Oct. 12, 1949 [Oct. 20, 1948; March 10, 1949; May 7, 1949], Nos. 26203/49, 26204/49 and 26205/49. Class 97 (i). An objective for use throughout a spectral range from within the ultra-violet region to within the infra-red region comprises a plurality of optically aligned catoptric and dioptric components having spherical surfaces and comprising a pair of mirror elements, the first having a central light-transmitting portion surrounded by a concave reflecting surface facing the short conjugate focus of the objective and the second having a convex reflecting sur- . face facing said concave reflecting surface, and one or more refractive elements transparent throughout the said spectral range and of such dimentions and form as to correct the mirror elements for spherical aberration and coma for differences in refraction caused by changes in refractive index of the order of 0.1 between the limits of said range while maintaining the position of the conjugate foci constant, and together with the mirror elements providing an objective of numerical aperture at least equal to 0.5, said second mirror element obscuring a small central portion of one refractive surface. Suitable materials for the dioptric components are calcium fluoride, lithium fluoride, fused quartz, and #-magnesium oxide. As shown in Fig. 3, the convex and concave reflecting elements are front-surface aluminium mirrors on elements VII, IX and correction of aberration is supplied by a thick plano-convex lens VI and a thick negative meniscus lens VIII, both of calcium fluoride, the latter serving also to prevent entry of dust into the objective through the aperture in the element IX. The objective is designed for use as an immersion objective in a microscope and the data given in the Specification allows for a quartz cover slide and water as the immersion liquid. In a modification the member VI is made in two parts, a planoconvex member of quartz and a contacting thick meniscus lens of calcium fluoride. These objectives may be used as " dry " objectives by replacing the plane surface by a curved surface having its centre of curvature at the short conjugate focus of the system. In a further arrangement the correcting elements are all placed on the short conjugate focus side of the convex mirror and consist of a doublet comprising an outer quartz double concave lens and a double convex lens of calcium fluoride. In a different embodiment (Fig. 4), the concave reflector is formed on the rear of a lens II and the convex reflector is formed on the front of a lens I, both of quartz. In a modification of this which may be used either as a " dry " objective or with a cover slide as an immersion objective, the convex mirror supporting lens and a piano convex lens having its plane face at the focus of the objective may both be of calcium fluoride. The Specification as open to inspection under Sect. 91, states without giving examples, that sodium chloride, potassium bromide, and potassium chloride may be used for the dioptric components and that the systems disclosed are adapted for the use of materials having a more restricted range of transmission, e.g. of glass which transmits visible light but not ultraviolet. This subject-matter does not appear in the Specification as accepted.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US691530XA | 1948-10-20 | 1948-10-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB691530A true GB691530A (en) | 1953-05-13 |
Family
ID=22087091
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB26203/49A Expired GB691530A (en) | 1948-10-20 | 1949-10-12 | Improvements in or relating to optical systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB691530A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112543884A (en) * | 2018-08-02 | 2021-03-23 | 浜松光子学株式会社 | Solid immersion lens unit and semiconductor inspection device |
-
1949
- 1949-10-12 GB GB26203/49A patent/GB691530A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112543884A (en) * | 2018-08-02 | 2021-03-23 | 浜松光子学株式会社 | Solid immersion lens unit and semiconductor inspection device |
CN112543884B (en) * | 2018-08-02 | 2024-02-09 | 浜松光子学株式会社 | Solid immersion lens unit and semiconductor inspection device |
US11913888B2 (en) | 2018-08-02 | 2024-02-27 | Hamamatsu Photonics K.K. | Solid immersion lens unit and semiconductor inspection device |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS6057314A (en) | Night visual apparatus | |
ES2102309B1 (en) | ULTRACOMPACT COMPLEX OPTICAL. | |
US2413286A (en) | Lens | |
US3897133A (en) | Telescopic optical system | |
GB1462164A (en) | Catadioptric optical system | |
US2490747A (en) | Infinity sight using a transparent reflector | |
US2604002A (en) | Optical infinity sight | |
US4344676A (en) | Single element spherical surfaced optics insensitive to wavelength and temperature | |
US4097141A (en) | Optical objectives using apertured retrodirective reflectors | |
US3001446A (en) | Optical systems comprising a spherical concave mirror and a meniscus lens | |
US3486805A (en) | Ultra-achromatic fluorite silica triplet lens system | |
US2576011A (en) | Catadioptric optical system | |
US2402216A (en) | Means for securing improvements in | |
GB691530A (en) | Improvements in or relating to optical systems | |
US4429956A (en) | Wet cornea telescope | |
US4266849A (en) | Optical objectives | |
ATE3590T1 (en) | MEASURING HEAD FOR A DENSITOMETER. | |
SU544422A1 (en) | Endoscope Optical System | |
US5319399A (en) | Optical alignment device | |
US2520636A (en) | Optical objective | |
GB1095078A (en) | Improvements relating to unit magnification catadioptric systems | |
SU16444A1 (en) | Objective system | |
GB680221A (en) | Improvements relating to microscope objectives | |
US2393782A (en) | Ocular | |
GB688067A (en) | Improvements in or relating to optical systems comprising two reflecting spherical surfaces |