GB732427A - Improvements relating to centred optical systems - Google Patents
Improvements relating to centred optical systemsInfo
- Publication number
- GB732427A GB732427A GB25311/53A GB2531153A GB732427A GB 732427 A GB732427 A GB 732427A GB 25311/53 A GB25311/53 A GB 25311/53A GB 2531153 A GB2531153 A GB 2531153A GB 732427 A GB732427 A GB 732427A
- Authority
- GB
- United Kingdom
- Prior art keywords
- conical
- concave
- mirror
- plane
- axis
- 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
- G02B17/0884—Catadioptric systems having a pupil corrector
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
732,427. Optical systems. NAAMLOOZE VENNOOTSCHAP OPTISCHE INDUSTRIE DE OUDE DELFT. Sept. 14, 1953 [Sept. 12, 1952; May 22, 1953; May 22, 1953], No. 25311/53. Class 97 (1). A central optical system includes one or more conical refracting or reflecting elements located so as to reduce the spherical aberration of the system. Each element comprises a surface in the shape of a circular cone with straight or substantially straight generatrix and with axis of symmetry coinciding with the optical axis of the system. The conical surface may be composed of several conical surfaces, each differently inclined to the axis. The other surface of the element being plane, concave or convex as' necessary. As shown in Fig. 3, a correcting element 1 having one surface conical and the other plane is used in conjunction with a doublet 2, 3 to correct spherical aberration. The other surface of the element may be concave, convex or aspherical and the central portion of the conical surface may be plane or spherical. If desired the central portion may be obscured by a mask a. Such an element may also be used as a condenser or in combination with a concave spherical mirror with, if desired, a meniscus correcting lens. Both surfaces of the element may be made conical in the same sense so that rays from the edge of the object are incident on the upper and lower parts of the conical lens at about equal angles. Fig. 7 shows a concave mirror receiving light from a meniscus correcting lens C and directing it to an image plane F via a conical mirror 12 having an apex angle of almost 180 degrees. When, for manufacturing reasons, the mirror 12 is provided with a central aperture it is obscured by an opaque disc a. Specification 638,976 is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL732427X | 1952-09-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB732427A true GB732427A (en) | 1955-06-22 |
Family
ID=19820305
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB25311/53A Expired GB732427A (en) | 1952-09-22 | 1953-09-14 | Improvements relating to centred optical systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB732427A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2949820A (en) * | 1956-01-06 | 1960-08-23 | Optische Ind De Oude Delft Nv | Optical systems |
| FR2424560A1 (en) * | 1978-04-24 | 1979-11-23 | Polaroid Corp | FIXED-FOCUS EXPOSURE CONTROL DEVICE WITH REVERSE SPHERICAL ABERRATION CORRECTION CHARACTERISTIC |
-
1953
- 1953-09-14 GB GB25311/53A patent/GB732427A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2949820A (en) * | 1956-01-06 | 1960-08-23 | Optische Ind De Oude Delft Nv | Optical systems |
| FR2424560A1 (en) * | 1978-04-24 | 1979-11-23 | Polaroid Corp | FIXED-FOCUS EXPOSURE CONTROL DEVICE WITH REVERSE SPHERICAL ABERRATION CORRECTION CHARACTERISTIC |
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