GB548750A - Improvements in or relating to projectors for the light image of a cathode-ray tube - Google Patents

Improvements in or relating to projectors for the light image of a cathode-ray tube

Info

Publication number
GB548750A
GB548750A GB45742A GB45742A GB548750A GB 548750 A GB548750 A GB 548750A GB 45742 A GB45742 A GB 45742A GB 45742 A GB45742 A GB 45742A GB 548750 A GB548750 A GB 548750A
Authority
GB
United Kingdom
Prior art keywords
mirror
screen
tube
spherical
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
Application number
GB45742A
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Priority to GB45742A priority Critical patent/GB548750A/en
Publication of GB548750A publication Critical patent/GB548750A/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)
  • Projection Apparatus (AREA)

Abstract

548,750. Optical-projection apparatus. PHILIPS LAMPS, Ltd. (Naamlooze Vennootschap Philips' Gloeilampenfabrieken). Jan. 12, 1942, No. 457. [Class 97 (i)] The image on the screen 2 of a cathoderay tube 1 is projected on to a screen 3 by means of a concave mirror 4 having its axis coincident with the axis of the tube, and by a mirror 6 inclined to this axis and apertured to receive the tube or to permit passage of light from it. The mirror 4 may be spherical, parabolic &c. and may be concentric with a spherical screen 2. Spherical and other aberrations may be corrected by a transparent plate 7 or by curvature of the mirror 6. The edge of the screen 2 may be tangential to the surface of the mirror 6, and the mirror surface may have an electric potential applied to it sufficient to prevent discharge to it from the screen 2 when the tube is in use, the mirror being insulated from the casing of the apparatus.
GB45742A 1942-01-12 1942-01-12 Improvements in or relating to projectors for the light image of a cathode-ray tube Expired GB548750A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB45742A GB548750A (en) 1942-01-12 1942-01-12 Improvements in or relating to projectors for the light image of a cathode-ray tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB45742A GB548750A (en) 1942-01-12 1942-01-12 Improvements in or relating to projectors for the light image of a cathode-ray tube

Publications (1)

Publication Number Publication Date
GB548750A true GB548750A (en) 1942-10-22

Family

ID=9704674

Family Applications (1)

Application Number Title Priority Date Filing Date
GB45742A Expired GB548750A (en) 1942-01-12 1942-01-12 Improvements in or relating to projectors for the light image of a cathode-ray tube

Country Status (1)

Country Link
GB (1) GB548750A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2476124A (en) * 1940-09-30 1949-07-12 Hartford Nat Bank & Trust Co Folded schmidt television projector
US2593724A (en) * 1941-07-14 1952-04-22 Optische Ind De Oude Delft Nv Microscope with reflecting objective

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2476124A (en) * 1940-09-30 1949-07-12 Hartford Nat Bank & Trust Co Folded schmidt television projector
US2593724A (en) * 1941-07-14 1952-04-22 Optische Ind De Oude Delft Nv Microscope with reflecting objective

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