US2387608A - Electronic scanning device for television - Google Patents

Electronic scanning device for television Download PDF

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Publication number
US2387608A
US2387608A US272073A US27207339A US2387608A US 2387608 A US2387608 A US 2387608A US 272073 A US272073 A US 272073A US 27207339 A US27207339 A US 27207339A US 2387608 A US2387608 A US 2387608A
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US
United States
Prior art keywords
screen
tube
mosaic
television
electron beam
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
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US272073A
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English (en)
Inventor
Paumier Andre Paul
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Individual
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Individual
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Publication date
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Publication of US2387608A publication Critical patent/US2387608A/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
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/021—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof arrangements for eliminating interferences in the tube

Definitions

  • It essen- tially consists in the use-of: armagnetic correcting field of relativelys'tsmall'i amplitude; the a'ction of which may be assumed tobe exerted on the very soft-secondary lfiparas'itic) electrons'Whiah cause themarks' as has been suggested.
  • the direction of-said magnetic field has to be'substantiallypar- --allel'vvith thecathode raylbeampf the icono- -scope-and inclinedfr'elatively' to the surface -'of --the scanningscreen.
  • Said tube l essentially comprises a screen 2 and a cathoderay oscillograph 3.
  • the screen 2 is formed by a metal collecting plate which is separated from a mosaic of photo-electric elements by an insulating plate.
  • On said screen is projected the image to be scanned 4 by means of an optical system 5.
  • the oscillograph essentially comprises a cathode 6, a grid 7, a first anode 8 and a second anode 9, and also means I 0 for causing the oathode-ray beam to deviate in two directions at right angles, so as to scan the screen 2.
  • Said'field' may be createdby a coil llwhich is suitably'arranged about the iconosco'pe'and-is supplied by a device 12 which supplies "it "with the necessary current. Satisfactory results are also obtained with an alternating magnetic field of appropriate form and -'frequency, -orwith-a field which is-a discontinuous function of Y thetime, for example which isof suitable intensity at certain instants" or during" certainver'y 'short intervalsgand is Zero "outside saidintervals, the -irequ'e'nc'y of thefield being in this case preferably 1 connected to the periodicity of the scanning, for example by controlling the device I2 by means of the same source of frequency which control the scanning device Hi.
  • a television transmitting tube comprising a mosaic screen formed by a conducting collecting surface, a mosaic of photo-electric elements, an insulating plate separating the latter from said surface, an electron gun, and deflecting means for scanning said screen by the electron beam, means for creating inside the transmitting tube a magnetic field of small intensity relatively to the other fields existing in the tube, the direction of which is substantially parallel with the electron beam and is inclined relatively to said screen,
  • a television transmitting tube comprising a mosaic screen formed by a conducting collecting surface, a mosaic of photo-electric elements, an
  • insulating plate separating the latter from said surface, an electron gun, and deflecting means for scanning said screen by the electron beam, a coil surrounding said tube, the axis of said coil being substantially parallel with the electron beam of the tube and inclined relatively to said screen, and means for sending an electric current through said coil, whereby a magnetic field hood of the screen, the axis of said coil being substantially parallel with the axis of the tube and inclined relatively to said screen, and means for sending an electric current through said coil, whereby a magnetic field directed to said screen is created inside the tube, which field prevents parasitic modulation of the image projected on said screen.
  • a television transmitting tube comprising a mosaic screen formed by a conducting collecting surface, a mosaic of photo-electric elements, an insulating plate separating the latter from said surface, an electron gun, and deflecting means for scanning said screen by the electron beam, means for creating inside the transmitting tube a continuous magnetic field of small intensity relatively to the other fields existing in the tube,
  • a television transmitting tube comprising a mosaic screen formed by a conducting collecting surface, a mosaic of photo-electric elements, an insulating plate p ing the latter from said surface, an electron gun, and deflecting means for scanning said screen by the electron beam, means for creating inside the transmitting tube an alternating magnetic field of small intensity relatively to the other fields existing in the tube, the direction of which is substantially parallel with the electron beam and is inclined relatively to saidscreen, whereby parasitic modulation of the image projected on said mosaic screen is prevented.
  • a television transmitting tube comprising a mosaic screen formed by a conducting collecting a means for creating inside the transmitting tube a discontinuous magnetic field of small intensity relatively to the other fields existing in the tube, the direction of which is substantially parallel with the electron beam and is inclined relatively to said screen, whereby parasitic modulation of the image projected on said mosaic screen is prevented.
  • a television transmitting tube comprising a mosaic screen formed by a conducting collecting surface, a mosaic of photo-electric elements, an insulating plate separating the latter from said surface, an electron gun, and deflecting means for scanning said screen by the electron beam, a coil surrounding said tube, the axis of said coil being substantially parallel with the electron beam of the tube and inclined relatively to said screen, and means for sending a continuous electric current through said coil, whereb a magnetic field is created inside the tube which prevents parasitic modulation of the image projected on said screen.
  • a television transmitting tube comprising a mosaic screen formed by a conducting collecting surface, a mosaic of photo-electric elements, an insulating plate separating the latter from said surface, an electron gun, and deflecting means for scanning said screen by the electron beam, a coil surrounding said tube, the axis of said coil being substantially parallel with the electron beam of the tube and inclined relatively to said screen, and means for sending an alternating electric current through said coil, whereby a magnetic field is created inside the tube which prevents parasitic modulation of the image projected on said screen.
  • a television transmitting tube comprising a mosaic screen formed by a conducting collecting surface, a mosaic of photo-electric elements, an insulating plate separating the latter from said surface, an electron gun, and deflecting means for scanning said screen by the electron beam, a coil surrounding said tube, the axis of said coil being substantially parallel with the electron beam of the tube and inclined relatively to said screen, and means for sending a discontinuous electric current through said coil, whereby a magnetic field is created inside the tube which prevents parasitic modulation of the image projected on said screen.

Landscapes

  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Transforming Electric Information Into Light Information (AREA)
US272073A 1938-05-12 1939-05-06 Electronic scanning device for television Expired - Lifetime US2387608A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR837860T 1938-05-12

Publications (1)

Publication Number Publication Date
US2387608A true US2387608A (en) 1945-10-23

Family

ID=9298774

Family Applications (1)

Application Number Title Priority Date Filing Date
US272073A Expired - Lifetime US2387608A (en) 1938-05-12 1939-05-06 Electronic scanning device for television

Country Status (4)

Country Link
US (1) US2387608A (enrdf_load_stackoverflow)
BE (1) BE433926A (enrdf_load_stackoverflow)
FR (1) FR837860A (enrdf_load_stackoverflow)
GB (1) GB541872A (enrdf_load_stackoverflow)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2517807A (en) * 1945-05-30 1950-08-08 Rca Corp Neutralization of deflection field between photocathode and mosaic of pickup tube
US2572644A (en) * 1947-08-29 1951-10-23 Emi Ltd Electron discharge tube
US2675499A (en) * 1948-07-10 1954-04-13 Bell Telephone Labor Inc Cathode-ray device
US2675501A (en) * 1950-10-31 1954-04-13 Rca Corp Electron beam focusing system
US2849530A (en) * 1955-09-12 1958-08-26 John H Fleet Means for observing boreholes
US2925524A (en) * 1956-03-16 1960-02-16 Gen Electric Methods and structures correcting for beam deflections in a television picture tube
US2962622A (en) * 1958-10-10 1960-11-29 Westinghouse Electric Corp Television degaussing apparatus
US2962621A (en) * 1958-10-10 1960-11-29 Westinghouse Electric Corp Color television apparatus
US3939378A (en) * 1973-08-16 1976-02-17 Tektronix, Inc. Storage cathode ray tube having auxiliary coils to correct non-symmetrical geometry

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1040704B (de) * 1957-04-03 1958-10-09 Pintsch Electro Gmbh Magnetische Kompensation des Stoersignals bei elektronischen Linienspeicherroehren

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2517807A (en) * 1945-05-30 1950-08-08 Rca Corp Neutralization of deflection field between photocathode and mosaic of pickup tube
US2572644A (en) * 1947-08-29 1951-10-23 Emi Ltd Electron discharge tube
US2675499A (en) * 1948-07-10 1954-04-13 Bell Telephone Labor Inc Cathode-ray device
US2675501A (en) * 1950-10-31 1954-04-13 Rca Corp Electron beam focusing system
US2849530A (en) * 1955-09-12 1958-08-26 John H Fleet Means for observing boreholes
US2925524A (en) * 1956-03-16 1960-02-16 Gen Electric Methods and structures correcting for beam deflections in a television picture tube
US2962622A (en) * 1958-10-10 1960-11-29 Westinghouse Electric Corp Television degaussing apparatus
US2962621A (en) * 1958-10-10 1960-11-29 Westinghouse Electric Corp Color television apparatus
US3939378A (en) * 1973-08-16 1976-02-17 Tektronix, Inc. Storage cathode ray tube having auxiliary coils to correct non-symmetrical geometry

Also Published As

Publication number Publication date
GB541872A (en) 1941-12-16
BE433926A (enrdf_load_stackoverflow)
FR837860A (fr) 1939-02-22

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