US2081344A - Braun tube - Google Patents

Braun tube Download PDF

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Publication number
US2081344A
US2081344A US679501A US67950133A US2081344A US 2081344 A US2081344 A US 2081344A US 679501 A US679501 A US 679501A US 67950133 A US67950133 A US 67950133A US 2081344 A US2081344 A US 2081344A
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Prior art keywords
ray
tube
anode
cathode
coils
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Expired - Lifetime
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US679501A
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English (en)
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Ardenne Manfred Von
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Individual
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Individual
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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
    • H01J29/52—Arrangements for controlling intensity of ray or beam, e.g. for modulation

Definitions

  • This invention relates to Braun tubes, more particularly for television purposes.
  • FIG. 1 is a diagrammatic view of a known television receiver designed by the inventor.
  • Figs. 2 and 3 show by way of example television devices according to the invention.
  • flection light intensity control as employed by the applicant heretofore resides in the numerous control manipulations and in the difliculty to perform adjustment. Practical tests were, therefore, carried out with tubes specifically intended for television purposes in order to simplify the deflection light control. On the basis of these investigations the following aspects and simpli-.
  • Fig. 1 shows the circuit system for deflection lightintensity control heretofore employed by the applicant at the receiving end.
  • the first direct potential which biases the plate designated I, serves for the purpose of regulating the resting posi- 10 tion of the ray, and of selecting between positive and negative control. Insofar as change over is contemplated to be made from positive to negative control, and as long as adjustment of the working point is desired on the light control 15 curve, regulation of the position of the ray tube is not to be avoided. In contradistinction to the following regulations, this regulation is, from a practical standpoint of considerable importance. In the case of the plate 2 in Fig. 1 only the al- 20 ternating potential is really necessary to compensate the deflection of the ray. 'A direct potential is not required for this purpose, particularly if the'shutter is so arranged in the tube that the ray is disposed to a certain extent in a 5 straight line.
  • the electrostatic deflection at this point possesses the fundamental disadvantage of causing variations in speed in addition to the desired deflections. For this reason it is proposed, in 40 place of electrostatic deflection, to make use of magnetic deflection. In the case of magnetic deflection much clearer experimental conditions may be obtained, which moreover greatly facilitate the entire arrangement.
  • the deflection it- 45 self naturally requires to be performed with coils of very small geometric dimensions, which are fitted in the tube in the vicinity of the passage of the ray.
  • the natural wave length of the very thin-wire, vacuum-encased coils may be located 50 at, say, III cycles.
  • the strengths of field resulting upon a corresponding number of windings and anode currents of 10 milliamperes are sufflcient to cause the desired deflections of the ray.
  • An arrangement with magnetic deflection of the 55 ray, as proposed by the inventor, is illustrated in Fig. 2.
  • the coils l and 2 have the same eifect as the plates I and 2 in Fig. 1.
  • Fig. 2, 3 is the envelope of the Braun tube, at the front end whereof the picture receiving screen 4 is preferably provided.
  • 5 is the cathode of the Braun tube which may conveniently be surrounded by a Wehnelt cylinder 6.
  • the anode may be formed as shown by a long metallic tube 1 provided at both its ends with apertured discs 8:9.
  • I0 is the diaphragm for shuttering off a varying percentage of the cathode ray in accordance with the controlling variations which are applied to the magnet coil l and effect a varying cathode ray deflection.
  • Ii and H are two pairs of deflecting plates for deflecting the cathode ray in two directions perpendicular to each other so that the ray scans the picture area on the screen 4.
  • NG is a voltage supply, for instance, a mains supply apparatus which may be fed from alternating current mains. the output tube of the amplifier for the light intensity controlling voltages.
  • the'direct anode current is made to flow therethrough together with the alternating anode current of the said output tube.
  • the ray is situated more or less at the edge of the shutter l0 dependent on the adjustment of the working pointof the tube l3, 1. e., dependent on the position of the potentiometer P in Fig. 2. This adjustment accordingly governs the deflection of the ray in the stationary condition.
  • the coil 2 only the alternating anode current is made to flow therethrough for performing the compensation. The arrangement is still more simple if only alternating current is made to flow through both of the two coils, and the resting position of the ray is adjusted from the exterior by means of a small magnet H.
  • the deflecting coils themselves are raised to the potential of the anode.
  • the electrons possess a fully constant speed from the entry into the anode tube up to the exit from the anode tube.
  • the sheathing also of the deflecting plates by the anode has the advantage that the slow electrons returning from the screen do not for the greater part reach the deflecting plates, but are intercepted previously, whereby the conditions in the Braun tube are also more defined.
  • the two deflecting coils arranged in front of and behind the shutter are also provided with small geometric dimensions; the static coil field, however, is screened off against the ray by means of a grid-like arrangement l5, ii. If this screening effect is performed with the gridlike arrangement as shown, or in other suitably adapted fashion, the magnetic fleld of the deflecting coils will be affected only to an inappreciable extent in its action on the ray. In an arrangement according to Fig. 3, therefore, a pure control of the intensity of the ray is performed without any action of whatever kind on the speed, so that the after concentration cylinder may also be dispensed with.
  • the following advan-- tages are accordingly obtained:
  • a Braun tube comprising a cathode and an anode mounted'in operative relationship thereto for producing a cathode ray
  • said anode consisting of a metallic tube which is furnished at its both ends with apertured discs, a fluorescent screen, two pairs of deflecting plates for deflecting the cathode ray in two directions vertical to each other for scanning said screen, said deflecting plates being mounted within said anode I: I tube near that end of said tube which is facing said screen, an apertured disc mounted within said anode tube between said deflecting plates and that opening of said tube which is facing said cathode, and two coils, each of said coils comprising a high number of windings, each oi said coils being mounted at one side of said apertured disc within said anode tube.
  • a Braun tube comprising a cathode and an anode mounted in operative relationship therein for producing a cathode ray, a picture receiving screen, two pairs of deflecting plates mounted between said anode and said screen for deflecting the cathode ray in two directions vertical to each other for scanning said screen, an apertured disc mounted between said anode and said deflecting plates, two magnetic coils, each of said coils being mounted at one side of said disc, and two grids, each of said grids being adapted to be supplied with a constant potential, each of said grids being interposed between one of said magnetic coils and the path of the ray for preventing an electrostatic influence of said coils on said ray.
  • a Braun tube comprising a cathode and an anode mounted in operative relationship thereto for producing a cathode ray, a picture receiving screen, two pairs of deflecting plates mounted between said anode and said screen for deflecting the cathode ray in two directions vertical to each other for scanning said screen, an apertured disc mounted between said anode and said deflecting plates, two magnetic coils, each of said coils being mounted at one side of said disc, and two grids, each of said grids being adapted to be supplied with a constant potential, each of said grids being interposed between one of said magnetic coils and the path of the ray for preventing an electrostatic influence of said coils on said ray, and an additional magnet disposed outside the tube for adjusting the direction of the non-deflected ray.
  • a Braun tube comprising an evacuated envelope enclosing a cathode and an anode arranged in operative relationship thereto for producing a cathode ray, said anode consisting of a metallic tube which is furnished at its both ends with apertured discs, a picture receiving screen, two pairs of deflecting plates for deflecting the cathode ray for the purpose of scanning said screen, and means for controlling the intensity of said cathode ray, said deflecting plates and said intensity control means being arranged within said anode tube.
  • a Braun tube comprising a closed envelope, a cathode and an anode mounted inside said envelope and in operative relationship to said cathode for producing a cathode ray, said anode consisting of a metallic tube which is furnished at its both ends with apertured discs, a fluorescent screen, two pairs of deflecting plates for deflecting the cathode ray in two directions perpendicular to each other for scanning said screen, said defleeting plates being mounted within said anode tube.
  • a Braun tube comprising a closed envelope, a cathode and an anode mounted inside said envelope and in operative relationship to said cathode for, producing a cathode ray
  • said anode consisting of a metallic tube which is furnished at its both ends with apertured discs, a fluorescent screen, two pairs of deflecting plates for deflecting the cathode ray in two directions perpendicular to each other for scanning said screen, said deflecting plates being mounted within said anode tube more remote from that end of said tube which is facing said cathode than from that end of said tube which is facing said screen.

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  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
US679501A 1932-07-11 1933-07-08 Braun tube Expired - Lifetime US2081344A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE423793X 1932-07-11

Publications (1)

Publication Number Publication Date
US2081344A true US2081344A (en) 1937-05-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
US679501A Expired - Lifetime US2081344A (en) 1932-07-11 1933-07-08 Braun tube

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US (1) US2081344A (fr)
FR (1) FR758237A (fr)
GB (1) GB423793A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3694686A (en) * 1970-01-09 1972-09-26 Tokyo Shibaura Electric Co Unidirectional double deflection type cathode ray tube

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3694686A (en) * 1970-01-09 1972-09-26 Tokyo Shibaura Electric Co Unidirectional double deflection type cathode ray tube

Also Published As

Publication number Publication date
GB423793A (en) 1935-02-08
FR758237A (fr) 1934-01-12

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