GB597468A - Improvements in or relating to cathode-ray tubes having an electrostatic projection lens and circuit arrangements comprising such a tube - Google Patents

Improvements in or relating to cathode-ray tubes having an electrostatic projection lens and circuit arrangements comprising such a tube

Info

Publication number
GB597468A
GB597468A GB21304/45A GB2130445A GB597468A GB 597468 A GB597468 A GB 597468A GB 21304/45 A GB21304/45 A GB 21304/45A GB 2130445 A GB2130445 A GB 2130445A GB 597468 A GB597468 A GB 597468A
Authority
GB
United Kingdom
Prior art keywords
diaphragm
electrode
cathode
tube
electrons
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
GB21304/45A
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.)
Philips Lamps Ltd
Koninklijke Philips NV
Original Assignee
Philips Lamps Ltd
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 Lamps Ltd, Philips Gloeilampenfabrieken NV filed Critical Philips Lamps Ltd
Publication of GB597468A publication Critical patent/GB597468A/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
    • 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
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/06—Screens for shielding; Masks interposed in the electron stream
    • 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

Landscapes

  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)
  • Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)
  • Pyridine Compounds (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

597,468. Cathode-ray tubes. PHILIPS LAMPS, Ltd. Aug. 21, 1945, No. 21304. Convention date, March 9, 1940. [Class 39 (i)] In a cathode-ray tube a diaphragm 11 delimiting the beam 13 is placed beyond the cross-section 6 of the beam which is projected on the picture screen by the electrostatic lens 4, 5 and is adapted to transmit only that part 14 of the electrons diverging from the path of the effective beam which does not directly adjoin the beam. As shown in Fig. 2, the diaphragm is a small ring joined to the cylinder 4 by narrow arms 12. It is found that only the diverging electrons directly adjoining the beam give harmful secondary emission when they strike the end diaphragm 7 of electrode 5, so that the remainder can be allowed to pass without harm. Further, since only a small number of electrons is collected by diaphragm 11, undesirably large fluctuations of the potential of electrode 4 are provided ; what small fluctuation remains can be turned to account by arranging that the resultant change in focal length of lens 4, 5 shall exactly compensate for the axial movement of cross-section 6 during modulation. Pre-concentration is effected by lens 2, 3, electrode 3 being made unitary with electrode 4 to form a long fieldfree tube which absorbs any secondaries emitted by diaphragm 11. The subject-matter is identical with that of Specification 549,476.
GB21304/45A 1940-03-09 1945-08-21 Improvements in or relating to cathode-ray tubes having an electrostatic projection lens and circuit arrangements comprising such a tube Expired GB597468A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL223635X 1940-03-09

Publications (1)

Publication Number Publication Date
GB597468A true GB597468A (en) 1948-01-27

Family

ID=19779509

Family Applications (2)

Application Number Title Priority Date Filing Date
GB12155/41A Expired GB549476A (en) 1940-03-09 1941-09-19 Improvements in or relating to cathode ray tubes having an electrostatic projection lens and devices comprising such tubes
GB21304/45A Expired GB597468A (en) 1940-03-09 1945-08-21 Improvements in or relating to cathode-ray tubes having an electrostatic projection lens and circuit arrangements comprising such a tube

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB12155/41A Expired GB549476A (en) 1940-03-09 1941-09-19 Improvements in or relating to cathode ray tubes having an electrostatic projection lens and devices comprising such tubes

Country Status (7)

Country Link
US (1) US2341764A (en)
BE (1) BE440981A (en)
CH (1) CH223635A (en)
DE (1) DE1077336B (en)
FR (1) FR874105A (en)
GB (2) GB549476A (en)
NL (1) NL58348C (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB648118A (en) * 1948-11-25 1950-12-28 Frederick Henry Townsend Improvements in or relating to cathode ray tubes with magnetic deflection
NL153273B (en) * 1950-05-02 Bosch Gmbh Robert DRAIN DEVICE FOR THE CONTINUOUS DRAINAGE OF A SUGAR MASS FROM A VACUUM BOILER FOR VAPORING A VISCOUS MASS OF SUGAR.
US2672568A (en) * 1951-03-27 1954-03-16 Int Standard Electric Corp Electron gun for cathode-ray tubes
DE1076827B (en) * 1952-05-24 1960-03-03 Telefunken Gmbh Electron beam generation system for cathode ray tubes
BE521804A (en) * 1952-07-30
US2818519A (en) * 1953-11-13 1957-12-31 Telefunken Gmbh Cathode-ray tube
NL98369C (en) * 1958-07-17
US4345182A (en) * 1980-06-02 1982-08-17 The Boeing Company Electrode having spiral-shaped electrically conducting regions therein useful as an anode in electron beam discharge devices
DE19534124A1 (en) * 1995-09-14 1997-03-20 Licentia Gmbh cathode ray tube

Also Published As

Publication number Publication date
DE1077336B (en) 1960-03-10
CH223635A (en) 1942-09-30
GB549476A (en) 1942-11-23
FR874105A (en) 1942-07-29
US2341764A (en) 1944-02-15
NL58348C (en)
BE440981A (en)

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