GB680916A - Improvements relating to cathode ray tube apparatus - Google Patents

Improvements relating to cathode ray tube apparatus

Info

Publication number
GB680916A
GB680916A GB3045449A GB3045449A GB680916A GB 680916 A GB680916 A GB 680916A GB 3045449 A GB3045449 A GB 3045449A GB 3045449 A GB3045449 A GB 3045449A GB 680916 A GB680916 A GB 680916A
Authority
GB
United Kingdom
Prior art keywords
ray tube
screen
tube apparatus
mirror
cathode ray
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
GB3045449A
Inventor
Edward Albert James Hall
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.)
EMI Ltd
Electrical and Musical Industries Ltd
Original Assignee
EMI Ltd
Electrical and Musical Industries 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 EMI Ltd, Electrical and Musical Industries Ltd filed Critical EMI Ltd
Priority to GB3045449A priority Critical patent/GB680916A/en
Publication of GB680916A publication Critical patent/GB680916A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/02—Simple or compound lenses with non-spherical faces
    • G02B3/08—Simple or compound lenses with non-spherical faces with discontinuous faces, e.g. Fresnel lens
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor
    • H04N5/7416—Projection arrangements for image reproduction, e.g. using eidophor involving the use of a spatial light modulator, e.g. a light valve, controlled by a video signal
    • H04N5/7425—Projection arrangements for image reproduction, e.g. using eidophor involving the use of a spatial light modulator, e.g. a light valve, controlled by a video signal the modulator being a dielectric deformable layer controlled by an electron beam, e.g. eidophor projector

Abstract

680,916. Optical-projection systems. ELECTRIC & MUSICAL INDUSTRIES, Ltd. Nov. 16, 1950 [Nov. 28, 1949], No. 30454/49. Drawings to Specification. Class 97 (i). [Also in Groups XL (a) and XL (b)] In a cathode-ray tube apparatus, e.g. a television receiver of the type wherein the picture is projected by an optical system, a Fresnel lens is provided close to the fluorescent screen and may form the end wall of the tube. The lens projects the light from the screen on to a concave mirror which reflects and focuses the light on a projection screen. A further reflector may be interposed between the lens and the mirror so that the cathode-ray tube may be arranged outside the light path between the mirror and the projection screen.
GB3045449A 1949-11-28 1949-11-28 Improvements relating to cathode ray tube apparatus Expired GB680916A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3045449A GB680916A (en) 1949-11-28 1949-11-28 Improvements relating to cathode ray tube apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3045449A GB680916A (en) 1949-11-28 1949-11-28 Improvements relating to cathode ray tube apparatus

Publications (1)

Publication Number Publication Date
GB680916A true GB680916A (en) 1952-10-15

Family

ID=10307944

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3045449A Expired GB680916A (en) 1949-11-28 1949-11-28 Improvements relating to cathode ray tube apparatus

Country Status (1)

Country Link
GB (1) GB680916A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1166816B (en) * 1964-04-02 Karl Pichler Projection device for television receivers
US4589739A (en) * 1985-09-09 1986-05-20 Steven Goodman Television magnification apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1166816B (en) * 1964-04-02 Karl Pichler Projection device for television receivers
US4589739A (en) * 1985-09-09 1986-05-20 Steven Goodman Television magnification apparatus

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