GB447493A - Improvements in and relating to modulating means for cathode ray tubes - Google Patents

Improvements in and relating to modulating means for cathode ray tubes

Info

Publication number
GB447493A
GB447493A GB33294/34A GB3329434A GB447493A GB 447493 A GB447493 A GB 447493A GB 33294/34 A GB33294/34 A GB 33294/34A GB 3329434 A GB3329434 A GB 3329434A GB 447493 A GB447493 A GB 447493A
Authority
GB
United Kingdom
Prior art keywords
aperture
diaphragm
cathode
diameter
diaphragms
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
GB33294/34A
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 GB33294/34A priority Critical patent/GB447493A/en
Priority to FR46705D priority patent/FR46705E/en
Priority to US50121A priority patent/US2112378A/en
Priority to DEE2690D priority patent/DE895200C/en
Publication of GB447493A publication Critical patent/GB447493A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/52—Arrangements for controlling intensity of ray or beam, e.g. for modulation

Abstract

447,493. Cathode-ray tubes. NICOLL, F. H., 24, Basildene Road, Hounslow West, and ELECTRIC & MUSICAL INDUSTRIES, Ltd., Blyth Road, Hayes, both in Middlesex. Nov. 19, 1934, No. 33294. Addition to 431,327. [Class 39 (i)] In a cathode-ray tube provided with accelerating and decelerating electrodes in the manner described in the parent Specification, the decelerating electrode, used for modulating purposes, comprises an apertured diaphragm in which the thickness of the material surrounding the aperture substantially exceeds one-tenth of the diameter of the aperture, or comprises a plurality of apertured diaphragms located one behind the other in the electron path. A single diaphragm may be of uniform thickness and is provided with a cylindrical or tapered aperture or with an aperture, the periphery of which is curved, e.g. partly circular, as shown in Fig. 8. The required thickness around the aperture may be obtained by an extension 8a, Fig. 3, which may be cylindrical, conical or flared and may be located on either side thereof. When two diaphragms are provided, the sizes of the apertures therein may be equal or the aperture in the diaphragm nearer the cathode may be smaller or larger than that in the other. Three diaphragms may be provided and the diameter of the aperture in the middle diaphragm, and also the diameter of the central part of the aperture of the diaphragm shown in Fig. 8, may be as small as possible.
GB33294/34A 1934-11-19 1934-11-19 Improvements in and relating to modulating means for cathode ray tubes Expired GB447493A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB33294/34A GB447493A (en) 1934-11-19 1934-11-19 Improvements in and relating to modulating means for cathode ray tubes
FR46705D FR46705E (en) 1934-11-19 1935-11-07 Improvements to cathode ray lamps
US50121A US2112378A (en) 1934-11-19 1935-11-16 Modulating means for cathode ray tubes
DEE2690D DE895200C (en) 1934-11-19 1935-11-20 Cathode ray tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB33294/34A GB447493A (en) 1934-11-19 1934-11-19 Improvements in and relating to modulating means for cathode ray tubes

Publications (1)

Publication Number Publication Date
GB447493A true GB447493A (en) 1936-05-19

Family

ID=10351051

Family Applications (1)

Application Number Title Priority Date Filing Date
GB33294/34A Expired GB447493A (en) 1934-11-19 1934-11-19 Improvements in and relating to modulating means for cathode ray tubes

Country Status (4)

Country Link
US (1) US2112378A (en)
DE (1) DE895200C (en)
FR (1) FR46705E (en)
GB (1) GB447493A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4318027A (en) 1978-04-12 1982-03-02 Rca Corporation High potential, low magnification electron gun

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2672568A (en) * 1951-03-27 1954-03-16 Int Standard Electric Corp Electron gun for cathode-ray tubes
US2597363A (en) * 1951-06-29 1952-05-20 Ibm Cathode-ray storage tube
US3374379A (en) * 1964-03-02 1968-03-19 Nippon Columbia Low second grid voltage electron gun
EP0725972B1 (en) * 1994-08-25 1998-11-18 Koninklijke Philips Electronics N.V. Picture display device provided with an electron gun, and electron gun for use in such a device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4318027A (en) 1978-04-12 1982-03-02 Rca Corporation High potential, low magnification electron gun

Also Published As

Publication number Publication date
US2112378A (en) 1938-03-29
FR46705E (en) 1936-08-10
DE895200C (en) 1953-11-02

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