GB627673A - Improvements in or relating to optical projection systems - Google Patents

Improvements in or relating to optical projection systems

Info

Publication number
GB627673A
GB627673A GB21989/47A GB2198947A GB627673A GB 627673 A GB627673 A GB 627673A GB 21989/47 A GB21989/47 A GB 21989/47A GB 2198947 A GB2198947 A GB 2198947A GB 627673 A GB627673 A GB 627673A
Authority
GB
United Kingdom
Prior art keywords
mirror
projection
screen
spherical
relating
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
GB21989/47A
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.)
Marconis Wireless Telegraph Co Ltd
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph Co Ltd
Marconi Co Ltd
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 Marconis Wireless Telegraph Co Ltd, Marconi Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Publication of GB627673A publication Critical patent/GB627673A/en
Expired legal-status Critical Current

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
    • G02B17/0888—Catadioptric systems having a pupil corrector the corrector having at least one aspheric surface, e.g. Schmidt plates
    • 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)
  • Transforming Electric Information Into Light Information (AREA)
  • Lenses (AREA)
  • Stereoscopic And Panoramic Photography (AREA)

Abstract

627,673. Optical systems. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. Aug. 8, 1947, No. 21989. Convention date, Nov. 29, 1940. [Class 97 (i)] In objectives comprising a spherical mirror 11 and a plate 12 correcting for spherical aberration, and used for projecting from a cathoderay tube 10, kinematograph film &c., in a position such that the spherical mirror faces the screen of the cathode-ray tube &c., the central portion of the surface of the mirror is rendered non-reflecting with the object of improving contrast in the projected image. The central area is not substantially less than that of the projection of the screen by lines parallel to the optical axis, and may, as shown, equal the area of the projection by lines radiating from the centre of curvature of the mirror; it may have a mask 16 applied to it, may be painted dead black, may be left unsilvered, or may be cut away. Specifications 452,148, 487,241, [both in Group XL], and 537,738 are referred to.
GB21989/47A 1940-11-29 1947-08-08 Improvements in or relating to optical projection systems Expired GB627673A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US627673XA 1940-11-29 1940-11-29

Publications (1)

Publication Number Publication Date
GB627673A true GB627673A (en) 1949-08-12

Family

ID=22044659

Family Applications (1)

Application Number Title Priority Date Filing Date
GB21989/47A Expired GB627673A (en) 1940-11-29 1947-08-08 Improvements in or relating to optical projection systems

Country Status (1)

Country Link
GB (1) GB627673A (en)

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