US2170251A - Television tube - Google Patents

Television tube Download PDF

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Publication number
US2170251A
US2170251A US751190A US75119034A US2170251A US 2170251 A US2170251 A US 2170251A US 751190 A US751190 A US 751190A US 75119034 A US75119034 A US 75119034A US 2170251 A US2170251 A US 2170251A
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US
United States
Prior art keywords
cathode
tube
deflecting
plate
cathode ray
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
US751190A
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English (en)
Inventor
Schlesinger Kurt
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.)
Loewe Opta GmbH
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Loewe Opta GmbH
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 Loewe Opta GmbH filed Critical Loewe Opta GmbH
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Publication of US2170251A publication Critical patent/US2170251A/en
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    • 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

Definitions

  • the subject matter of the invention is a television tube with high vacuum, which may be operated with magnetic deflection, and also with a special electrostatic deflection according to the invention.
  • a hot cathode consisting of an incandescent head portion l and a sufliciently large spot of oxide 2 of approximately 1 mm. diameter applied to the centre thereof is heated in the manner known per se by means of an internally arranged simple or bifilar filament 3.
  • the aperture of l the object which is optically reproduced, is furnished with the form of the desired image point, and with the dimensions of the tube quoted afterwards is of the order of 1 mm.
  • a negative bias applied to the intermediate cylinder 6 it may be accomplished that in the position light the entire emission passes through I unweakened.
  • the geometrical dimensions of 6 may be easily so selected that it is possible to connect 6 with the cathode in direct fashion as shown in the drawing. In other cases a suitable bias source may be provided.
  • the optical reproduction is performed by generating an electrically refractive plane 8, which in accordance with the invention is obtained by the fact that the bulb is provided at its inside with a metallic coating and that this coating is interrupted at a point 8, and the thus resulting metallic coatings of the neck and the bulb-abutting portion 9 and the body of the bulb H] on the screen side are linked up with difierent potentials.
  • the potential at 9 amounts to approximately 500 volts assuming the potential of the bulb coating l0 amounts to approximately 2000 volts.
  • the more the line of intersection 8 is approached towards the screen the greater fi requires to be the difference in potential between 9 and 10, as it is all the greater that the refractive power of this electrostatic lens requires to be.
  • the applicant has found that it is possible to- 0 perform the deflection of the bundle of cathode rays in the space between the cathode and the electron optical lens, provided that 1.
  • the cross-sectional area marked by the oscillating cone of rays in the plane of the lens 8 is small in comparison to the total cross-section of the lens (in the model made approximately mm. movement of ray within 80 mm. lens diameter);
  • counter-cadence-operation means that one deflecting plate is supplied with a deflecting voltage and the other deflecting plate is supplied with a voltage of the same amplitude as said deflecting voltage but reverse phase.
  • Deflecting voltages of this kind may be produced for example with the use of counter-cadence amplifiers arranged in the output circuit of a thyratron valve and the use of such arrangements forms also a part of the present invention.
  • the supply of potential to the plates may take place directly through the bulb or by leads con.- ducted in screened insulating tubes I4, preferably in small silvered glass tubes 2
  • the tube surrounding the deflecting plates in the same manner as the dynamically earthed condenser plate, is preferably connected with earth in direct fashion.
  • a potential distributor H permits of veryexact adjustment of the maximum sharpness of image.
  • the middle annular coating 20 formed over the deflecting system may be connected with a lower potential than the front and rear coatings 9' and I0.
  • Two-electrostatic lenses are then connected in'series, and there is then obtained 'a certainly somewhat poorer scale of reproduction, i. e., a somewhat larger image point than in 'the case of the previous tube with one line of intersection.
  • Separate means may be provided (for example potentiometers) for being able to adjust the potential of each'o'fthe electrode coatings independently of one another.
  • a cathode ray tube comprising an evacuated envelope enclosing a cathode and an anode mounted in operative relationship thereto for producing a. cathode ray, a control electrode mounted in the vicinity of said cathode for controlling the intensity of said cathode ray, a picture receiving screen, an electrostatical electron-optical system for focussing the cathode ray onto said screen, two deflecting systems mounted between said anode and said screen for deflecting the cathode ray in two directions perpendicular to one another for the purpose of scanning said e'creen, 'each of said deflecting systems comprising two deflecting, plates, and connecting leads for said deflecting plates, said leads extending in the direction of the tube axis and being provided with a cover-of insulating material,
  • a cathode ray tube comprising an evacuated envelope enclosing a cathode for producing a cathode ray, an anode mounted in operative relationship to said cathode, a picture receiving screen, an electron-optical system mounted between said anode and said screen for focussing the cathode ray onto said screen, said electronoptical system comprising a plurality of metallic Wall coatings mounted along the axis of said envelope on.
  • each of said metallic wall coatings having a circular crosssection, said wall coatings being adapted to have 'diiferent voltages impressed thereon, two pairs of deflecting plates mounted between said anode and said screen for deflecting the cathode ray in two directions perpendicular to one another for the purpose of scanning said screen, connecting leads for said deflecting plates, said connecting leads extending in the direction of the axis of said envelope, tubes of insulating material surrounding said connecting leads, a plurality of metallic coatings surrounding each of said tubes, the number and length of said coatings corresponding to the number and length 'of-said wall coatings forming said electron-optical system, and means forconnecting each of said coating with the corresponding wall coating of the electron-optical system.
  • a deflecting condenser for deflecting the cathode ray comto those edges of the adjacent condenser plate which are to be dispensed transversely to the cathode 'ray direction turned over edges which embrace the adjacentcondenser plate edges.
  • a cathode ray tube comprising means. to produce a cathode ray the combination comprising at least one deflecting condenser mounted in said tube and comprising two deflecting plates, means/to supply at least one of said deflecting plates with alternating deflecting potentials, at least one'auxiliary plate mounted adjacent and substantially parallel to any such of said deflecting plates as has alternating deflectingpotentials applied thereto, said auxiliary plate having, at its side situated adjacent to those edges of the adjacent condenser plate which are disposed transversely to the cathode ray direction turned over edges which embrace the adjacent condenser plate edges, and means for earthing said auxiliary plate dynamically.
  • a cathode ray tube comprising means to produce a cathode ray the combination comprising at least one deflecting condenser comprising two deflecting plates, means for supplying one of said deflecting plates with alternating deflecting potentials, means for earthing the other one of said deflecting plates dynamically, an auxiliary plate mounted adjacent and substantially parallel to the first said deflecting plate, said auxiliary plate having at its sides situated adjacent to those edges of the adjacent condenser plate which are disposed transversely to the cathode ray direction, turned over edges which embrace the adjacent condenser plate edges, and means for earthing said auxiliary plate dynamically.
  • a cathode ray tube comprising means to produce a cathode ray
  • the combination comprising at least one deflecting condenser comprising two deflecting plates, means for supplying one of said deflecting plates with alternating deflecting potentials, means for supplying the other one of said deflecting plates with alternating deflecting potentials having at each moment the same amplitude as the first mentioned deflecting potentials but opposite sign, and two auxiliary electrodes each mounted adjacent and substantially parallel to one of said deflecting plates, said auxiliary electrodes having, at their sides situated adjacent to those edges of the adjacent condenser plates which are disposed transversely to the cathode ray direction, turned over edges which embrace the adjacent condenser plates edges, and means for earthing said auxiliary electrodes dynamically.
  • a cathode ray tube comprising means including a cathode for producing a cathode ray, a picture receiving screen and an electron-optical lens system for focussing said cathode beam onto said picture receiving screen: an electronoptical pre-concentrator mounted between said cathode and said lens system and comprising two apertured plate electrodes mounted transverse to the axis of the cathode ray tube and having their apertures axially aligned with said cathode, and a cylindrical electrode mounted between said two plate electrodes and having its axis aligned with the apertures in said plate electrodes, said cylindrical electrode being adapted to be maintained negative relatively to said plate electrodes.
  • a cathode ray tube comprising means including a cathode for producing a cathode beam, a picture receiving screen and an electron-optical lens system for focussing said cathode beam onto said picture receiving screen: an electronoptical pre-concentrator mounted between said cathode and said lens system and comprising two apertured plate electrodes mounted transverse to the axis of the cathode ray tube and having their apertures axially aligned with said cathode, and a cylindrical electrode mounted between said two plate electrodes and having its axis aligned with the apertures in said plate electrodes, said cylindrical electrode being directly connected with said cathode.
  • a cathode ray tube comprising means including a cathode for producing a cathode beam, a picture receiving screen, a main anode for accelerating said cathode beam onto said picture receiving screen, and an electron-optical lens system for focussing said cathode beam onto said picture receiving screen: an electron-optical pre-concentrator mounted between said cathode and said lens system and comprising two apertured plate electrodes mounted transverse to the axis of the cathode ray tube and having their apertures axially aligned with said cathode, at least one of said plate electrodes being directly connected with said main anode, and a cylindrical electrode mounted between said two plate electrodes and having its axis aligned with the apertures in said plate electrodes, said cylindrical electrode being adapted to be maintained negative relatively to said plate electrodes.
  • a cathode ray tube comprising means including a cathode for producing a cathode beam, a picture receiving screen and an electronoptical lens system for focussing said cathode beam onto said picture receiving screen: an electron-optical ore-concentrator mounted between said cathode and said lens system and comprising three apertured plate electrodes mounted transverse to the axis of the cathode ray tube and having their apertures axially aligned with said cathode, that one of said plate electrodes disposed nearest said cathode having a short cylindrical abutment projecting in the direction away from said cathode, and a cylindrical electrode mounted between the two ones more remote from said cathode of said plate electrodes and having its axis aligned with the apertures in said plate electrodes, said cylindrical electrode being adapted to be maintained negative relatively to those two of said plate electrodes between which it is mounted.
  • a cathode ray tube having 'a wall of insulating material and comprising means for producing a cathode beam and a picture receiving screen
  • the combination comprising an electron lens system comprising two metal coatings on the inside of the wall of said tube, said twowall coatings being separated by a ring-shaped non-conductive zone of the wall of the tube the axis of which ring-shaped zone coincides with the axis of said tube, and means for applying to said two coatings a potential difference of at least several hundreds of volts so that an image producing lens field is formed between said two coatings.
  • a cathode ray tube having a wall of insulating material and comprising means for producing a cathode beam and a picture receiving screen
  • the combination comprising an electron lens system comprising three metal coatings on the inside of the wall of said tube, every two adjacent ones of said wall coatings being separated by a ring-shaped non-conductive zone of the wall of the tube the axis of which ringshaped zone coincides with the axis of said tube, and means for applying to every two adjacent ones of said coatings a potential difference of at least several hundreds of volts so that an image producing lens field is formed between every two adjacent ones of said coatings.
  • a cathode ray tube comprising an evacuated envelope of insulating material enclosing a cathode and an anode mounted in operative relationship thereto for producing a cathode beam, a picture receiving screen, an electron lens system for focussing said cathode beam onto said picture receiving screen, said lens system comprising metal coatings on the inside of the wall of said tube, every two adjacent ones of said metal coatings being separated by a ring-shaped zone of the wall of the tube the axis of which ring-shaped zone coincides with the axis of said tube, every two adjacent ones of said coatings being adapted to have different potentials im pressed thereon, an electron-optical preconcentrator mounted between said cathode and said lens system and comprising three apertured plate electrodes mounted transverse to the axis of said cathode ray tube and having their apertures axially aligned with said cathode, that one of said plate electrodes disposed nearest said cathode having a short cylindrical abutment projecting
  • a cathode ray tube comprising an evacuated envelope of insulating material enclosing a cathode and an anode mounted in operative relationship thereto for producing a cathode beam, a picture receiving screen, an electron lens system for focussing said cathode beam onto said picture receiving screen, said lens system comprising metal coating on the inside of the wall of said tube, every two adjacent ones of said metal coatings being separated by a ringshaped zone of the wall of the tube the axis of which ring-shaped zone coincides with the axis of said tube, every two adjacent ones of said coatings being adapted to have different potentials impressed thereon, an electron-optical preconcentrator mounted between said cathode and said lens system and comprising three apertured plate electrodes mounted transverse to the axis of said cathode ray tube and having their apertures axially aligned with said cathode, that one of said plate electrodes disposed nearest said cathode having a short cylindrical abutment projecting in the direction away

Landscapes

  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
US751190A 1933-11-08 1934-11-02 Television tube Expired - Lifetime US2170251A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE451574X 1933-11-08

Publications (1)

Publication Number Publication Date
US2170251A true US2170251A (en) 1939-08-22

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Family Applications (1)

Application Number Title Priority Date Filing Date
US751190A Expired - Lifetime US2170251A (en) 1933-11-08 1934-11-02 Television tube

Country Status (3)

Country Link
US (1) US2170251A (fr)
FR (1) FR780912A (fr)
GB (1) GB451574A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2617076A (en) * 1948-01-13 1952-11-04 Motorola Inc Electrostatic deflection system
US2658160A (en) * 1951-11-23 1953-11-03 Rauland Corp Image-reproducing device
US2733379A (en) * 1950-10-12 1956-01-31 Device of the kind comprising an elec-
US2834902A (en) * 1953-07-18 1958-05-13 Telefunken Gmbh Deflection system for cathode ray tubes
US3372298A (en) * 1966-05-31 1968-03-05 Texas Instruments Inc Color display system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2617076A (en) * 1948-01-13 1952-11-04 Motorola Inc Electrostatic deflection system
US2733379A (en) * 1950-10-12 1956-01-31 Device of the kind comprising an elec-
US2658160A (en) * 1951-11-23 1953-11-03 Rauland Corp Image-reproducing device
US2834902A (en) * 1953-07-18 1958-05-13 Telefunken Gmbh Deflection system for cathode ray tubes
US3372298A (en) * 1966-05-31 1968-03-05 Texas Instruments Inc Color display system

Also Published As

Publication number Publication date
FR780912A (fr) 1935-05-06
GB451574A (en) 1936-08-05

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