US2348853A - Cathode ray tube - Google Patents

Cathode ray tube Download PDF

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Publication number
US2348853A
US2348853A US239153A US23915338A US2348853A US 2348853 A US2348853 A US 2348853A US 239153 A US239153 A US 239153A US 23915338 A US23915338 A US 23915338A US 2348853 A US2348853 A US 2348853A
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US
United States
Prior art keywords
screen
cathode ray
anode
image
deflecting
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 - Lifetime
Application number
US239153A
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English (en)
Inventor
Schlesinger Kurt
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Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of US2348853A publication Critical patent/US2348853A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01J29/84—Traps for removing or diverting unwanted particles, e.g. negative ions, fringing electrons; Arrangements for velocity or mass selection
    • 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
    • H01J29/84—Traps for removing or diverting unwanted particles, e.g. negative ions, fringing electrons; Arrangements for velocity or mass selection
    • H01J29/845—Traps for removing or diverting unwanted particles, e.g. negative ions, fringing electrons; Arrangements for velocity or mass selection by means of magnetic systems

Definitions

  • the line results from the impact of ions on the fluorescent screen.
  • electrostatic flelds As well known the deflection in electrostatic flelds is independent of the mass of the particles, whereas an electromagnetic field causes a splitting of the bundle of rays owing to the diflerent effect of particles of different mass.
  • the screen is scanned by combined electrostatic and electro-magnetie deflecting means, the conditions are such that the ions in the'electrostatic field are deflected in exactly the same fashion as the electrons, wherev as in the magnetic field they are hardly-appreciably aii'ected.
  • the ions accordingly pass over a fairly sharp line through the centre of the image field parallel to the magnetic and electric lines of the field.
  • the ions meet against the fluorescent screen with great kinetic energy. Since at the present time sulphide is the chief material employed for the screen, the black line results under the well known greatly reducing action of the ions by reduction of the zinc sulphide, and-consists of a thin layer of metallic zinc.
  • an additional pair of defleeting plates the lines of force of which, in operation, are substantially perpendicular to the lines of force of the magnet coils forming part of the scanning system.
  • These deflecting plates are supplied with a constant potential of such nature that the ray, in its position of rest, is deflected beyond the extreme edge of the image. Since this preliminary deflection takes place el ostatically the electrons and the ions are acted upon in equal fashion.
  • the varying deflection of the image point for scanning the screen takes place asbefore by the usual methods.
  • Fig. 1 shows the tube according to the invention in an axial section parallel to the planes of the main deflecting plates, and some essential circuit elements,
  • Fig. 2 is a sectional view, vertical to that of Fig. 1, of the deflecting space,
  • Figs. 3 and 4 illustrate certain modifications of the connection of -a tube according to Fig. 1.
  • I is the anode
  • 4 and 5 are the coils for the magnetiedeflection vertical to the direction of the lines
  • 6 and I are two sheet iron boxes, which in the known fashion act as pole shoes for the electromagnet.
  • an additional pair of deflecting plates which consist of two plates 8 ands of non-magnetic sheet metal.
  • the deflecting plates) and 9 are applied with the aid of two potential sources is and ii to potentials which are preferably symmetrical with relation to the anode potential, and which are so selected that electrons and ions are deflected in common by at least one-half of thewidth of the image fleld, the ray n its stationary condition accordingly impinging on the image screen I! at the point P.
  • the requisite auxiliary potentials can be derived from the existing mains apparatus. It is also possible to dispense with one of these potentiais by connecting the plate 8 in direct In this manner the' The electronic ray accordingly.
  • the interfering eflect of the ions makes itself noticeable by the occurrence of a black spot at the centre of the image field.
  • a cathode ray tube comprising a luminescent screen and means including a cathode and an anode for producing a cathode ray and for focusing said cathode ray on said screen, a deflecting system arranged between said anode and said screen and comprising a pair of magnet coils, for causing said ray to scan said screen, a pair of deflecting plates mounted between said said pair of deflecting plates being so arranged that, in operation, the lines of force of said deflecting plates extend substantially vertically to the lines of force of said coils, means for connecting the one plate of said pair inside said tube to said anode and means for providing the other plate of said pair with such a potential with respect to said anode that said cathode ray in its stationary position is deflected out of the image field.
  • a cathode ray tube comprising a luminescent screen and means for focusing said cathode my on said screen
  • deflecting system arranged between said anode and said screen and comprising a pair of magfor causing said ray to scan said screen.
  • a pair of deflecting plates mounted between said anode and said deflecting system, said pair of deflecting plates being so arranged that, in operation, the lines of force of said deflecting plates extend substantially vertically to the lines of force of said coils, means for connecting the one plate of said pair inside said tube to said anode, and means for connecting the other plate of said pair inside said tube to an electrode of said tube other than said anode, said other electrode bein connected to a source of potential of such an amount with respect to said anode that said cathode ray in its stationary position is deflected out of the image field.

Landscapes

  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)
US239153A 1938-05-31 1938-11-05 Cathode ray tube Expired - Lifetime US2348853A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE214713X 1938-05-31
DE2332881X 1938-11-30

Publications (1)

Publication Number Publication Date
US2348853A true US2348853A (en) 1944-05-16

Family

ID=32094484

Family Applications (2)

Application Number Title Priority Date Filing Date
US239153A Expired - Lifetime US2348853A (en) 1938-05-31 1938-11-05 Cathode ray tube
US305967A Expired - Lifetime US2332881A (en) 1938-05-31 1939-11-24 Cathode ray tube arrangement

Family Applications After (1)

Application Number Title Priority Date Filing Date
US305967A Expired - Lifetime US2332881A (en) 1938-05-31 1939-11-24 Cathode ray tube arrangement

Country Status (5)

Country Link
US (2) US2348853A (fr)
BE (2) BE434620A (fr)
CH (2) CH214713A (fr)
FR (2) FR855511A (fr)
GB (1) GB529341A (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2623692A (en) * 1942-11-30 1952-12-30 Cossor Ltd A C Electrical fire control calculating apparatus
US2907915A (en) * 1956-02-16 1959-10-06 Gen Electric Cathode ray tube structure including combined electrostatic and magnetic convergence system
US2975325A (en) * 1956-05-26 1961-03-14 Gen Electric Electron beam deflection system
US3497762A (en) * 1965-11-03 1970-02-24 Minnesota Mining & Mfg Electron beam recording system and apparatus

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2724099A (en) * 1942-06-26 1955-11-15 Raytheon Mfg Co Signalling apparatus
US2448059A (en) * 1943-05-29 1948-08-31 Standard Telephones Cables Ltd Oscillograph trace control system
US2473691A (en) * 1947-08-05 1949-06-21 Bell Telephone Labor Inc Stabilization of cathode beam tubes
US2692945A (en) * 1951-03-01 1954-10-26 Honeywell Regulator Co Cathode-ray tube modulator
NL170932B (nl) * 1951-07-11 B & J Mfg Co Inrichting voor het omleggen en afnemen van een buitenband van een voertuigwiel, voorzien van een drukluchttoevoerconstructie voor een binnenbandloze band.
US2677779A (en) * 1953-05-22 1954-05-04 Rca Corp Tricolor kinescope magnetic shield
US5376864A (en) * 1992-10-29 1994-12-27 The United States Of America As Represented By The Department Of Energy Shielded serpentine traveling wave tube deflection structure

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2623692A (en) * 1942-11-30 1952-12-30 Cossor Ltd A C Electrical fire control calculating apparatus
US2907915A (en) * 1956-02-16 1959-10-06 Gen Electric Cathode ray tube structure including combined electrostatic and magnetic convergence system
US2975325A (en) * 1956-05-26 1961-03-14 Gen Electric Electron beam deflection system
US3497762A (en) * 1965-11-03 1970-02-24 Minnesota Mining & Mfg Electron beam recording system and apparatus

Also Published As

Publication number Publication date
CH234050A (de) 1944-08-31
US2332881A (en) 1943-10-26
FR855511A (fr) 1940-05-14
FR51069E (fr) 1941-08-06
GB529341A (en) 1940-11-19
CH214713A (de) 1941-05-15
BE434620A (fr)
BE437191A (fr)

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