US2577628A - Television system - Google Patents

Television system Download PDF

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Publication number
US2577628A
US2577628A US731275A US73127547A US2577628A US 2577628 A US2577628 A US 2577628A US 731275 A US731275 A US 731275A US 73127547 A US73127547 A US 73127547A US 2577628 A US2577628 A US 2577628A
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US
United States
Prior art keywords
electrons
window
image
wall
tube
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
US731275A
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English (en)
Inventor
Ponte Maurice
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.)
Thales SA
Original Assignee
CSF Compagnie Generale de Telegraphie sans Fil SA
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 CSF Compagnie Generale de Telegraphie sans Fil SA filed Critical CSF Compagnie Generale de Telegraphie sans Fil SA
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Publication of US2577628A publication Critical patent/US2577628A/en
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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

Definitions

  • the present invention -concerns the means for providing astrong luminous screen,'the various points of-which canfollow the modulation of the exciting beam, while it provides a new solution of the problem of tubesffor the conversionv of kinetic energy into luminous energy, applied nonlimitatively to the reproduction of television images.
  • the invention employs the luminous excitation of gases or of vapours traversed by beams of particles, and in particular by beams of electrons.
  • Figure 1 shows diagrannnatically ionization produced by passagev of electrons through a thin wall.
  • FIG. 2 shows a cathode ray tube constructed in accordance with this invention.
  • Figure 3 shows, partly in section, the development of parts constituting a resistance grid structure.
  • Figure 4 shows diierent structures for a goffered sheet in section.
  • Figure 5 shows diagrammatically an arrangement of the plurality of gas chambers usedV in the production of different colors.
  • Figure 6' shows partly diagrammatically and partly in section a cathode ray tube involving 'a further feature of this invention.
  • the invention involves the idea of increasing the-pressure of the gas in order to localise the light emitted so as to determine a suillcientl'y small point to permit of a good deinition, in conjunction with improvements in the outlet Win dow rendering possible the' application of the principle and defining the mesh of the system.
  • a cathode tube C ( Figure 2) comprises a very thin impervious windowfF.
  • This tube may be constructed in the normal way, for example with tWoelectric lenses L1, Laand deiiecting systems illustrated as magnetic systems (MnMz).
  • MnMz Laand deiiecting systems illustrated as magnetic systems
  • a chamber V pro- 'Videdwith a light-transparent Iglass G is connected to the window F transparent to electrons.
  • This chamber contains a gas which is illuminated at T under the action of the electrons assembled 4at I. 'It is necessary to localise this light to the f aluminum one-hundredth of a millimeter thick;
  • This window must have suicient dimensions to permit of obtaining an image with a good denition and at least with the substances at present known, this sheet could not withstand the pressure difference between the two containers C and V.
  • this window is constructed with the aid of a resistant grid, the mesh l of which is illustrated in Figure 3a, the window 2 (section 3b) being stuck thereto or supported thereby.
  • the section ofan element of this cellular structure is shown.
  • One improvement consists in directing the sides of the mesh towards the region of rotation of the beam in the tube, so that the beam is not too greatly intercepted on the sides of the image.
  • the transparent sheet may thus consist of light material, either metallic or semi-insulating.
  • the first category will include aluminium, for example, and the second will include sheets of plastic material, which can be obtained in very small thickness at least down to 100 a.
  • the grid itself may be ne if it is constructed from suitable metals such as high-resistance steel wires criss-crossing to form a mesh.
  • suitable metals such as high-resistance steel wires criss-crossing to form a mesh.
  • the actual form of the grid may be either that of a squared pattern, or it may be limited to parallel wires.
  • the ensemble of the window and of its grid may be produced in a single operation by moulding, so as to obtain a goiered sheet, the depth of the meshes of which may be determined as a function of the pressure to be withstood.
  • the goffering may also be formed on the two sides of the part transparent to electrons ( Figures 4a and 4b).
  • the moulding may be carried out on a metal grid, which gives a particularly resistant window.
  • That part of the meshes c which faces towards the tube C may also be metallised so that its potential is well deiined, which is advantageous as compared with fluorescent screens acting by transparency.
  • This construction aiiords the possibility of a Very fine mesh, having sides of the'order of T16 mm., so that a screen having sides of from several centimetres to one decimetre gives a suitable image.
  • the texture of the image may be given by the mesh of the window and that it will not be necessary to have too high a definition of the cathode spot, which affords the advantage of facilitating the construction of the tube.
  • the colour of the image is defined by the nature of the gas, and the apparatus according to the invention thus makes available to the person skilled in the art a very extensive range of colours as well as a screen which, by its very nature, is not liable to change colour or show fatigue.
  • the tubes according to the invention are therefore suitable not only for all applications in which it is desired to convert energy of particles into a luminous energy of one colour, but also for colour television.
  • several tubes-for example three-one for each of the fundamental colours may be simultaneously employed by ,superposing their projections on a screen by means of suitable optical systems.
  • a tube of a given colour, constructed in accordance with the invention, can receive all necessary improvements on the cathode side.
  • the scanning may be effected on slow electrons, for example 4,000 to 10,000 volts, and an additional acceleration to 100,000 or 500,000 volts will be effected by a combination of electric lenses.
  • Figure 6 shows diagrammatically a tube according to the invention provided with this improvement.
  • This figure shows at K the emitting cathode, a rst electric system L1, L2 which gives by scanning through the elds M1 and M2 an intermediate image I1 owing to the modulation of the beam by the electrode W.
  • the system V1, Vo gives the final image I2 on the window F after acceleration of the electrons to the desired voltage.
  • the goffering of the window is shown on a scale much larger than the true scale in order to reproduce the structure described in Figure 4b.
  • the voltage difference between Vo and K may be, for example, from 100,000 to 500,000 volts, the distribution of the voltages between the various electrodes being eiected according to the optical-requirements of the system.
  • the gas chamber is illustrated at V,
  • the inner face of the window will preferably be metallised on the thicker parts of the goi'fering so that the potential of the region of the final image may be well defined.
  • Television receiving tube comprising inside of an evacuated vessel an electron gun producing an electron beam, means for modulating said beam in intensity means for deecting the beam, means for impressing on the beam a high acceleration, said mentioned means being arranged in cascade at the beginning of the electron gun, a thin wall of material permeable to electrons closing tightly the said vessel, said wall being arranged within the sweep range of the' beam, a metallic grill or large mechanical resistance attached to said wall so as to render it more rigid, a chamber in part bounded by said wall and lled with gas under suitable pressure and a transparent wall closing said chamber through which the produced luminosity is observable.
  • Television receiving tube comprising inside of an evacuated vessel an electron gun producing an electron beam, means for modulating said "f beam in intensity, means for deecting the beam,
  • said mentioned means being arranged in cascade along the beam path at the beginning portion of the electron gun, a thin wall of material permeable to electrons closing tightly the said vessel, a metallic grill of large mechanical resistance located close to the said wall on the side opposite the beam impact, said wall being arranged within the sweep range of the beam, a chamber in part bounded by said wall and lled 5 with gas under pressure of over one atmosphere and a transparent Wall closing said chamber through which the produced luminosity is observable.

Landscapes

  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
US731275A 1946-02-09 1947-02-27 Television system Expired - Lifetime US2577628A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR923646T 1946-02-09

Publications (1)

Publication Number Publication Date
US2577628A true US2577628A (en) 1951-12-04

Family

ID=9438863

Family Applications (1)

Application Number Title Priority Date Filing Date
US731275A Expired - Lifetime US2577628A (en) 1946-02-09 1947-02-27 Television system

Country Status (4)

Country Link
US (1) US2577628A (de)
DE (1) DE838169C (de)
FR (1) FR923646A (de)
GB (1) GB648823A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2686275A (en) * 1951-03-31 1954-08-10 Rca Corp Art of storing or delaying the transmission of electrical signals

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1907507A (en) * 1925-04-28 1933-05-09 Gen Electric Electron discharge device
US2030492A (en) * 1931-12-14 1936-02-11 Applebaum David Glow tube control system
US2036532A (en) * 1928-12-12 1936-04-07 Knoll Cathode-ray-oscillograph
US2050411A (en) * 1930-12-20 1936-08-11 Cfcmug Receiving apparatus for television
US2143095A (en) * 1937-06-07 1939-01-10 Albert G Thomas Electronic device
US2191515A (en) * 1937-01-07 1940-02-27 Telefunken Gmbh Color television
US2213060A (en) * 1935-07-09 1940-08-27 Toulon Pierre Marie Gabriel Cathode ray tube
US2213070A (en) * 1936-07-11 1940-08-27 Farnsworth Television & Radio Image source
US2294820A (en) * 1941-04-28 1942-09-01 Hazeltine Corp Color television signal-translating system
US2310863A (en) * 1941-01-25 1943-02-09 Rca Corp Luminescent screen
US2330172A (en) * 1938-04-12 1943-09-21 Scophony Corp Of America Color television
US2335180A (en) * 1942-01-28 1943-11-23 Alfred N Goldsmith Television system
US2389645A (en) * 1943-02-05 1945-11-27 Jr George E Sleeper Television system
US2449872A (en) * 1946-10-04 1948-09-21 Electronized Chemleals Corp Electron discharge vessel

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1907507A (en) * 1925-04-28 1933-05-09 Gen Electric Electron discharge device
US2036532A (en) * 1928-12-12 1936-04-07 Knoll Cathode-ray-oscillograph
US2050411A (en) * 1930-12-20 1936-08-11 Cfcmug Receiving apparatus for television
US2030492A (en) * 1931-12-14 1936-02-11 Applebaum David Glow tube control system
US2213060A (en) * 1935-07-09 1940-08-27 Toulon Pierre Marie Gabriel Cathode ray tube
US2213070A (en) * 1936-07-11 1940-08-27 Farnsworth Television & Radio Image source
US2191515A (en) * 1937-01-07 1940-02-27 Telefunken Gmbh Color television
US2143095A (en) * 1937-06-07 1939-01-10 Albert G Thomas Electronic device
US2330172A (en) * 1938-04-12 1943-09-21 Scophony Corp Of America Color television
US2310863A (en) * 1941-01-25 1943-02-09 Rca Corp Luminescent screen
US2294820A (en) * 1941-04-28 1942-09-01 Hazeltine Corp Color television signal-translating system
US2335180A (en) * 1942-01-28 1943-11-23 Alfred N Goldsmith Television system
US2389645A (en) * 1943-02-05 1945-11-27 Jr George E Sleeper Television system
US2449872A (en) * 1946-10-04 1948-09-21 Electronized Chemleals Corp Electron discharge vessel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2686275A (en) * 1951-03-31 1954-08-10 Rca Corp Art of storing or delaying the transmission of electrical signals

Also Published As

Publication number Publication date
FR923646A (fr) 1947-07-11
GB648823A (en) 1951-01-10
DE838169C (de) 1952-03-27

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