GB402460A - Improvements in or relating to cathode ray tubes - Google Patents

Improvements in or relating to cathode ray tubes

Info

Publication number
GB402460A
GB402460A GB15693/32A GB1569332A GB402460A GB 402460 A GB402460 A GB 402460A GB 15693/32 A GB15693/32 A GB 15693/32A GB 1569332 A GB1569332 A GB 1569332A GB 402460 A GB402460 A GB 402460A
Authority
GB
United Kingdom
Prior art keywords
cathode
electrodes
apertured
tube
electrode
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
GB15693/32A
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 GB15693/32A priority Critical patent/GB402460A/en
Priority to FR754518D priority patent/FR754518A/en
Priority to US672974A priority patent/US2072957A/en
Publication of GB402460A publication Critical patent/GB402460A/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
    • H01J29/58—Arrangements for focusing or reflecting ray or beam
    • H01J29/62—Electrostatic lenses
    • H01J29/622—Electrostatic lenses producing fields exhibiting symmetry of revolution
    • H01J29/624—Electrostatic lenses producing fields exhibiting symmetry of revolution co-operating with or closely associated to an electron gun

Abstract

402,460. Cathode-ray tubes. ELECTRICAL & MUSICAL INDUSTRIES, Ltd., Hayes, Middlesex, and McGEE, J. D., 184, Haverstock Hill, London. June 2, 1932, No. 15693. [Class 39 (i).] A cathode-ray tube is provided with an apertured control electrode and two or more apertured auxiliary electrodes, one at least of which is in the form of an annulus having a frusto-conical or dished shape. In the form shown in Fig. 1, a tube contains an indirectlyheated cathode 5, a frustoconically shaped auxiliary electrode 9 and cylindrical control and auxiliary electrodes 7, 11 which are provided with apertured diaphragms. The anode 6 consists of a metallic deposit on the tube, preferably on both the cylindrical and the conical portions thereof. In a modification, two or more frusto-conically shaped electrodes 9, 11, Fig. 3, are provided, the length of these electrodes and the vo tages thereon increasing directly in dependence upon their distance from the cathode. A numerical relationship between the electrode voltages and the distances therebetween is given in the Specification. The apertures, which may be covered with wire mesh, are smaller the greater the distance from the cathode.
GB15693/32A 1932-06-02 1932-06-02 Improvements in or relating to cathode ray tubes Expired GB402460A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB15693/32A GB402460A (en) 1932-06-02 1932-06-02 Improvements in or relating to cathode ray tubes
FR754518D FR754518A (en) 1932-06-02 1933-04-19 Improvements to cathode ray tubes
US672974A US2072957A (en) 1932-06-02 1933-05-26 Electron tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB15693/32A GB402460A (en) 1932-06-02 1932-06-02 Improvements in or relating to cathode ray tubes

Publications (1)

Publication Number Publication Date
GB402460A true GB402460A (en) 1933-12-04

Family

ID=10063743

Family Applications (1)

Application Number Title Priority Date Filing Date
GB15693/32A Expired GB402460A (en) 1932-06-02 1932-06-02 Improvements in or relating to cathode ray tubes

Country Status (3)

Country Link
US (1) US2072957A (en)
FR (1) FR754518A (en)
GB (1) GB402460A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE763222C (en) * 1938-08-23 1954-10-04 Siemens & Halske A G Indirectly heated glow cathode for electron beam tubes

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL83700C (en) * 1942-03-24
US2451813A (en) * 1943-03-30 1948-10-19 Westinghouse Electric Corp Electron discharge device having an electron beam passage and aligning means therewith for the cathode
BE514668A (en) * 1951-10-09
US2712087A (en) * 1954-10-19 1955-06-28 Plural beam electron discharge devices
US5220239A (en) * 1991-12-09 1993-06-15 Chunghwa Picture Tubes, Ltd. High density electron beam generated by low voltage limiting aperture gun
US5159240A (en) * 1991-12-09 1992-10-27 Chunghwa Picture Tubes, Ltd. Low voltage limiting aperture electron gun
US5223764A (en) * 1991-12-09 1993-06-29 Chunghwa Picture Tubes, Ltd. Electron gun with low voltage limiting aperture main lens
US5327044A (en) * 1992-04-27 1994-07-05 Chunghwa Picture Tubes, Ltd. Electron beam deflection lens for CRT
US5204585A (en) * 1992-04-27 1993-04-20 Chen Hsing Yao Electron beam deflection lens for color CRT
US5182492A (en) * 1992-05-20 1993-01-26 Chunghwa Picture Tubes, Ltd. Electron beam shaping aperture in low voltage, field-free region of electron gun

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE763222C (en) * 1938-08-23 1954-10-04 Siemens & Halske A G Indirectly heated glow cathode for electron beam tubes

Also Published As

Publication number Publication date
FR754518A (en) 1933-11-08
US2072957A (en) 1937-03-09

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