GB304721A - - Google Patents
Info
- Publication number
- GB304721A GB304721A GB514/29A GB51429A GB304721A GB 304721 A GB304721 A GB 304721A GB 514/29 A GB514/29 A GB 514/29A GB 51429 A GB51429 A GB 51429A GB 304721 A GB304721 A GB 304721A
- Authority
- GB
- United Kingdom
- Prior art keywords
- angle
- prism
- take place
- reflections
- mirrors
- 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
- G02B5/00—Optical elements other than lenses
- G02B5/04—Prisms
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
304,721. Zeiss, C., [Firm of]. Jan. 25, 1928, [Convention date]. Prism, systems.-In order to avoid the necessity of utilizing glass of high refractive index in the Porro prisms of telescopes having wideangle objectives, the prisms are modified in such a manner that at least two reflections will take place under an angle of incidence greater than 45‹. The entering and emerging rays are rendered parallel by reclining the intersecting line of one of the two double mirrors. The two reflections mentioned above may be in the same double mirror or may take place, one in each of the double mirrors. In Figs. 1-3 the two reflections take place in prism I, and the prism II has the intersecting edge J, K of the two mirrors inclined at an angle #2 to the entrance surface MPON cf the ray. The angle alpha1, of prism I is 47‹ and the angle #1, is 39‹, the angle #1 being 94‹. The angles #1 and #2 are both 94‹ so that the ray emerges at an angle of 8‹ to the direction of incidence. In the case in which the angles of incidence greater than 45‹ occur one in each prism the intersecting lines of the mirrors of both prisms are inclined to the entrance surface of the ray. In a modification all the reflections take place under an angle of incidence greater than 45‹.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE304721T | 1928-01-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB304721A true GB304721A (en) | 1929-10-10 |
Family
ID=31894400
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB514/29A Expired GB304721A (en) | 1928-01-25 | 1929-01-07 |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB304721A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2463692A1 (en) * | 2010-12-07 | 2012-06-13 | Andreas Dr. Perger | Prism |
-
1929
- 1929-01-07 GB GB514/29A patent/GB304721A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2463692A1 (en) * | 2010-12-07 | 2012-06-13 | Andreas Dr. Perger | Prism |
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