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
Application number
GB514/29A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Carl Zeiss AG
Original Assignee
Carl Zeiss AG
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 as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Carl Zeiss AG filed Critical Carl Zeiss AG
Publication of GB304721A publication Critical patent/GB304721A/en
Expired legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/04Prisms

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‹.
GB514/29A 1928-01-25 1929-01-07 Expired GB304721A (en)

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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2463692A1 (en) * 2010-12-07 2012-06-13 Andreas Dr. Perger Prism

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2463692A1 (en) * 2010-12-07 2012-06-13 Andreas Dr. Perger Prism

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