US2003775A - Braun tube - Google Patents

Braun tube Download PDF

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Publication number
US2003775A
US2003775A US670819A US67081933A US2003775A US 2003775 A US2003775 A US 2003775A US 670819 A US670819 A US 670819A US 67081933 A US67081933 A US 67081933A US 2003775 A US2003775 A US 2003775A
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United States
Prior art keywords
anode
cathode
electrode
potential
tube
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Expired - Lifetime
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US670819A
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English (en)
Inventor
Schlesinger Kurt
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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
    • H01J29/58—Arrangements for focusing or reflecting ray or beam
    • H01J29/62—Electrostatic lenses
    • H01J29/622—Electrostatic lenses producing fields exhibiting symmetry of revolution
    • H01J29/624—Electrostatic lenses producing fields exhibiting symmetry of revolution co-operating with or closely associated to an electron gun

Definitions

  • the concentration field formed pursuant to the invention may be produced by means of semi-conductors.
  • the invention may be more fully understood from the appended drawing, whereof Fig. 1 shows schematically the arrangement according to the invention, whilst in Fig. 2 a Braun tube furnished with a circular ring consisting of semi-conductive material is shown, and
  • Fig. 3 is a Braun tube, wherein a semi-conductor is provided which possesses the form of a conical tube.
  • l is a shutter having the aperture 2, through which there emerges the bundle of electrons (electron outlet aperture).
  • the shutter I is preferably constructed in the form of a circular ring, and furnished with a highly ohmic resistive coating 3 on the side directed towards the anode.
  • a suitably selected high negative bias for example 500-1000 volts
  • the inner edge at the outlet aperture possesses, in comparison potential in relation to the ray, and 6 a screening means, the potential of which is selected in such fashion that the upward point of the field situated between the resistive coating 3 and the anode l coincides approximately with the centre point of the anode.
  • Fig. 2 there is shown a suitable form of embodiment of a semi-conductive perforated shutter in conjunction with screening electrodes.
  • a stream of electrons passes from a cathode I having a relatively large surface to a metallic shutter 2 without concentration, i. e., with a certain dispersion.
  • the dispersion may certainly already be reduced, preferably by means of a Wehnelt cylinder 9, but it is impossible with 9 and 2 alone to obtain from a large-surface cathode l a small focal point on the luminous screen.
  • the arrangement 9, 2 does not cover in lenticularly exact fashion bundles of rays with large dispersion and expanse. The efficiency of the same is greater in the arrangement described in the following.
  • the potential between 2 and l is positive and relatively small, for example about +200 volts.
  • the problem resides in focusing of all paths of electrons on a remotely arranged screen image point 3. This is only possible if the. rays of the bundle 4 wandering to the greatest extent are deflected to the greatest degree towards the centre. According to the invention, this is accomplished by the stated semi-condu'ctive shutter 5.
  • the inner edge of a disc of mica coated with a resistive substance possesses the potential of the screening shutter 2, whilst the outer edge on the other hand is raised to a preferably variable and strongly negative potential of, say, (-l)-(--500) volts.
  • the outer edge of disc 5 is supplied with the negative bias through the lead attached to the lower end of said disc.
  • Shutters of this nature may be produced in ready fashion.
  • This actual main anode is the metallic shutter 6, which is furnished with a very small hole.
  • the method is suitable for use in television tubes with light control.
  • screening walls I. to avoid the effect of external fields, which walls may possess approximately the potential of the first anode 2 or the inner edge respectively. It may be accomplished by a screening means 8, which leaves merely a small ring of the high potential anode uncovered, that the latter acts virtually with merely a very small opening corresponding with the small reciprocal of 8.
  • the screening means are preferably linked up with a potential, which corresponds with that of the preliminary anode or that of the inner edge of the highly ohmic of semi-conductive plate.
  • a large-surface cathode I is situated at the entrance of a conical tube I 5.
  • the tube is made from a semi-conductive material, or is coated with a material of this nature on the inside and is otherwise insulatory. It is possible, therefore, to build up between the. closing rings 2 and III of this tube a difierence in potential which, with suitable production of the tube resistance, may readily amount to a few hundred volts. 'It may then be observed that a large number of the field lines run parallel to the walls of the tube, and there is accordingly an excellent possibility of producing in positive fashion a defined converging acceleration field of cylindrically symmetrical kind.
  • a preliminary concentration of the bundle of rays is rendered possible from the largesurface cathode I with the assistance of a condenser of the Wehnelt cylinder 9 to approximately .50 volts, so that the bundle of rays already enters the metallic shutter 2 with a divergence which is no longer of an excessive kind,
  • the semi-conductor tube I5 may also be combined in many different ways with other arrangements of a known kind. Behind the same, for example, there may be provided an after-acceleration anode 6 raised to correspondingly higher potential, and the like.
  • Light control may also take place, for example before the entry into the shutter 2, at the Wehnelt cylinder 9, or also otherwise, in the manner known per se, without variation in the optical conditions, as the same are rigidly determined by the semi-conductor tube I5.
  • An advantage of the arrangement is also to be regarded in the fact that the optical axis, with suitable length of the tube I5, is very well defined, andowing to the large aperture of this optic is not varied even if on account of inexact centering of the Wehnelt cylinder 9 upon the light control small lateral movements of the bundle of rays take place at the commencement.
  • the invention is of particular importance for Braun tubes with a hot cathode.
  • the same may be used with advantage in the case of tubes having a gas filling, but is also of advantage in connection with high-vacuum cathode ray tubes.
  • the tubes may naturally be furnished in the known'manner with one or more pairs.
  • said means comprising an electrode consisting of semi-conductive material, being arranged between said cathode and said anode.
  • a Braun tube comprising a plate-shaped indirectly heated cathode, an anode, means to control, means to, deflect the cathode ray, a fluorescent screen, and a plate-shaped electrode of semi-conductive material furnished with an opening, said electrode being arranged in the path of the cathode ray between said cathode and said anode.
  • a Braun tube comprising a plate-shaped indirectly heated cathode, an anode, means to control, means to deflect the cathode ray, a fluorescent screen, and a plate of insulating material furnished with an opening and arranged in the path of the cathode "ray between said cathode and said anode, the side of. said plate of insulating material directed to the anode being coated with a material of a high ohmic resistance, the outer edge of said coating being adapted to be connected with the negative pole, and the'inner edge of said coating being adapted to be connected with the positive pole' of a potential source.
  • a Braun tube comprising a plate-shaped indirectly heated cathode, an anode, means to control, means to defiect the cathode ray a fluorescent screen, a plate-shaped metallic electrode furnished with an opening arranged between said cathode and said anode, a plate-shaped element of insulating material furnished on its one side directed to the anode witha material of a high ohmic resistance, said insulating element arranged between said metallic electrode and said anode and a further plate-shaped metallic electrode furnished with an opening arranged between said semi-conductive element and said anode, said further electrode being connected with the first said one.
  • a Braun tube comprising a plate-shaped indirectly heated cathode, an anode, means to control, means to deflect the cathode ray, a fluorescent screen, and an electrode of a truncated hollow conical form consisting of poorly conductive material, said electrode arranged between said cathode and said anode, the end of said electrode directed to the anode adapted to' have a high positive potential applied thereto.
  • a Braun tube comprising a plate-shaped indirectly heated cathode, an anode, means to control, means to deflect the cathode ray, a fluorescent screen, and an electrode of a. truncated hollow conical form consisting of poorly conductive material, said electrode arranged between said cathode and said anode, the end of said electrode directed to the anode being adapted to have a high positive potential applied thereto, the conical base of said electrode being directed towards said anode.
  • a Braun tube comprising a plate-shaped indirectly heated cathode, an anode, means to control, means to deflect the cathode ray and a fluorescent screen, a metallic electrode adapted to have a positive potential applied thereto, arranged between said cathode and said anode, an electrode adapted to have a negative potential applied thereto at least partly consisting of a material of high ohmic resistance arranged between said electrode and said anode, and a cylinder adapted to have a positive potential applied thereto furnished at its end directed to the anode with a shutter furnished with an opening surrounding said two electrodes.
  • a Braun tube comprising a cathode, an anode, a picture receiving screen, two pairs of deflecting plates for scanning said screen, and means for concentrating the cathode ray, said means including an electrode consisting of semiconductive material, said electrode being arranged between said cathode and said anode.

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)
US670819A 1932-05-14 1933-05-13 Braun tube Expired - Lifetime US2003775A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE421050X 1932-05-14

Publications (1)

Publication Number Publication Date
US2003775A true US2003775A (en) 1935-06-04

Family

ID=6455496

Family Applications (1)

Application Number Title Priority Date Filing Date
US670819A Expired - Lifetime US2003775A (en) 1932-05-14 1933-05-13 Braun tube

Country Status (4)

Country Link
US (1) US2003775A (enrdf_load_stackoverflow)
FR (1) FR755580A (enrdf_load_stackoverflow)
GB (1) GB421050A (enrdf_load_stackoverflow)
NL (1) NL41683C (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2430482A (en) * 1942-02-12 1947-11-11 Raytheon Mfg Co Gaseous electric lamp
US2438709A (en) * 1942-08-06 1948-03-30 Hartford Nat Bank & Trust Co Thermionic tube having secondary electron emissive electrode with surface and form variations
US2498673A (en) * 1945-09-22 1950-02-28 Int Standard Electric Corp Velocity modulation tube
US3355618A (en) * 1965-10-21 1967-11-28 Rca Corp Electron gun for use in a cathode ray tube exhibiting enhanced electron emission

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2430482A (en) * 1942-02-12 1947-11-11 Raytheon Mfg Co Gaseous electric lamp
US2438709A (en) * 1942-08-06 1948-03-30 Hartford Nat Bank & Trust Co Thermionic tube having secondary electron emissive electrode with surface and form variations
US2498673A (en) * 1945-09-22 1950-02-28 Int Standard Electric Corp Velocity modulation tube
US3355618A (en) * 1965-10-21 1967-11-28 Rca Corp Electron gun for use in a cathode ray tube exhibiting enhanced electron emission

Also Published As

Publication number Publication date
NL41683C (enrdf_load_stackoverflow)
GB421050A (en) 1934-12-12
FR755580A (fr) 1933-11-27

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