US2332876A - Braun tube - Google Patents

Braun tube Download PDF

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Publication number
US2332876A
US2332876A US261726A US26172639A US2332876A US 2332876 A US2332876 A US 2332876A US 261726 A US261726 A US 261726A US 26172639 A US26172639 A US 26172639A US 2332876 A US2332876 A US 2332876A
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US
United States
Prior art keywords
cathode ray
mirror
electron
screen
potential
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
US261726A
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English (en)
Inventor
Uhlmann Wolfram
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Individual
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Individual
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Filing date
Publication date
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Application granted granted Critical
Publication of US2332876A publication Critical patent/US2332876A/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
    • 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
    • H01J29/60—Mirrors

Definitions

  • a cathode ray emitted from the electron sun of a cathode ray or Braumtube as employed for metering purposes or in television receiver equipments is subjected to a predetermined deflection along two coordinates of the coordinate system on its way toward the fluorescent screen of such tube in order to scan the screen and thus perform image reproduction on this screen.
  • This cathode ray deflection has heretofore been effected by means of homogeneous electrostatic or electromagnetic flelds, or even by suitably combining these two possibilities.
  • This facility in the first instance involves the essential feature that on account of a considerable bend imparted to the cathode ray when reflected at the electron mirror, also the vessel of the cathode ray tub may be fundamentally changed from its prior straight form and be accommodated to the bend of the cathode ray, in other words, the vessel ma assume a shap which corresponds to the letter L, or even to the letter V.
  • This is of particular importance when it is desirable to increase the diameter of the fluorescent screen, since such increase would inevitably require a proportional elongation of the heretofore known straight cathode ray tube, while a vacuum vessel of the new shape as a result of my invention is compact even in connection with'a fluorescent screen of larger diameter.
  • the throat portion may cathode ray tubes may be partially or entirely omitted by employing an electron mirror or mirrors for deflecting the cathode ray to scan and screen
  • G is a V-shaped evacuated vessel of a cathode ray or of a Braun tube according to my invention.
  • the cathode of this tube is shown at K, while the cathode ray concentrating, accelerating and intensity control means are indicated by dashes, since these means form no part of this invention.
  • The-cathode ray T of lumped cross'sectional area emitted from'the cathode K is projected onto the electron mirror S.
  • My invention makes use of the known fact that it is-possible by varying the potential of the control electrode 2 of the be considerably reduced because of the fact that the electrostatic o'r electromagnetic deflecting means located in this portion of the conventional electron mirror S to, gradually change the reflective action of this mirror from that of a divergent reflector, to that of a convergent or concentrating reflector via the state of a plane mirror, or vice versa.
  • This effect of reflective action variability is involved on account of a change of the electron reflecting equipotential surfaces from con-s vexity via planeness to concavity, or vice versa, in response to a variable potential applied to the electrode 2 controlling said equipotential surfaces.
  • the electron reflecting properties of an electron mirror are thus utilized according to my invention for reflecting the cathode ray onto the fluorescent screen L and for gradually defleeting this ray on the screen in either direction along one of the coordinates of the coordinate system, that is, for the line scanning or for the scanning along the other coordinate.
  • deflection along the other of the coordinates may be achieved in a similar manner by means of a second electron mirror as above described. but it is alsopossible to apply any of the heretofore known methods for effecting this deflection without departing from the scope of my invention.
  • a cathode ray tube including an evacuated vessel, an electron gun for emitting a cathode ray, a fluorescent screen at one end of said vessel, defleeting means for causing said ray to scan said screen, said, deflecting means including an electron mirror located in thepath of said cathode I my control means for varying the eflective shape of the reflecting surface of said electron mirror, and means for applying a scanning potential to said control means, whereby said cathode ray scans the surface or said screen in: accordance with variation in the scanning potential applied to said control means.
  • a cathode ray tube in which said electron mirror include electrode means for producing an equi-potential surface in the path of said cathode. ray to reflect said ray at an angle onto said fluorescent scream said mirror including further electrode means for changing the shape or said equi-potential surface.
  • a cathode ray tube including an evacuated vessel having a throat portion and a flared n n tion, an electron gun in said throat portion for producing a cathode ray, a fluorescent screen at the end or said flared portion, deflecting means for causing said my to scan said screen, said deflecting means including a first virtual electron mirror in the path of said cathode ray, said electron mirror including means for varying the shape or the reflecting surface of said mirror, and a second virtual electron mirror in the range of said cathode ray for continually reproducing said ray on said fluorescent screen along parallel lines perpendicular to those caused by said first-mentioned electron mirror, and means for applying scanning potentials 'to said shape varying means and said second virtual mirror, whereby said cathode ray scans said fluorescent screen along perpendicular coordinates.

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  • Transforming Electric Information Into Light Information (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
US261726A 1938-04-04 1939-03-14 Braun tube Expired - Lifetime US2332876A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE208840X 1938-04-04

Publications (1)

Publication Number Publication Date
US2332876A true US2332876A (en) 1943-10-26

Family

ID=5794459

Family Applications (1)

Application Number Title Priority Date Filing Date
US261726A Expired - Lifetime US2332876A (en) 1938-04-04 1939-03-14 Braun tube

Country Status (4)

Country Link
US (1) US2332876A (OSRAM)
BE (1) BE433386A (OSRAM)
CH (1) CH208840A (OSRAM)
FR (1) FR851959A (OSRAM)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2453647A (en) * 1940-08-15 1948-11-09 Hartford Nat Bank & Trust Co Electric discharge tube with deflection control
US2502146A (en) * 1946-10-14 1950-03-28 Csf Electron microscope provided with a projecting mirror
US2506659A (en) * 1941-04-11 1950-05-09 Csf Electron discharge tube
US2538714A (en) * 1948-04-14 1951-01-16 Hartford Nat Bank & Trust Co Electric discharge tube
US2580675A (en) * 1947-06-26 1952-01-01 Csf Correction device for microscopes of the reflection mirror type
US2653993A (en) * 1948-04-29 1953-09-29 Rca Corp Simultaneous color television optical system
US2762916A (en) * 1950-07-13 1956-09-11 Hartford Nat Bank & Trust Co Device comprising an electric discharge tube having a concentrated electron beam
US2842711A (en) * 1957-04-19 1958-07-08 Du Mont Allen B Lab Inc Television tube
US2926274A (en) * 1955-06-20 1960-02-23 Nat Res Dev Electron lenses
US2997621A (en) * 1956-04-04 1961-08-22 Motorola Inc Image display device
US2999957A (en) * 1956-08-01 1961-09-12 Philips Corp Cathode ray tube
US3023342A (en) * 1958-07-18 1962-02-27 Gen Atronics Corp Beam modulating devices and method
EP0221639A1 (en) * 1985-09-20 1987-05-13 Hitachi, Ltd. Cathode-ray tube
US4739218A (en) * 1985-04-18 1988-04-19 Schwartz Samuel A Short cathode ray tube
US6617779B1 (en) 2001-10-04 2003-09-09 Samuel A. Schwartz Multi-bend cathode ray tube

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2453647A (en) * 1940-08-15 1948-11-09 Hartford Nat Bank & Trust Co Electric discharge tube with deflection control
US2506659A (en) * 1941-04-11 1950-05-09 Csf Electron discharge tube
US2502146A (en) * 1946-10-14 1950-03-28 Csf Electron microscope provided with a projecting mirror
US2580675A (en) * 1947-06-26 1952-01-01 Csf Correction device for microscopes of the reflection mirror type
US2538714A (en) * 1948-04-14 1951-01-16 Hartford Nat Bank & Trust Co Electric discharge tube
US2653993A (en) * 1948-04-29 1953-09-29 Rca Corp Simultaneous color television optical system
US2762916A (en) * 1950-07-13 1956-09-11 Hartford Nat Bank & Trust Co Device comprising an electric discharge tube having a concentrated electron beam
US2926274A (en) * 1955-06-20 1960-02-23 Nat Res Dev Electron lenses
US2997621A (en) * 1956-04-04 1961-08-22 Motorola Inc Image display device
US2999957A (en) * 1956-08-01 1961-09-12 Philips Corp Cathode ray tube
US2842711A (en) * 1957-04-19 1958-07-08 Du Mont Allen B Lab Inc Television tube
US3023342A (en) * 1958-07-18 1962-02-27 Gen Atronics Corp Beam modulating devices and method
US4739218A (en) * 1985-04-18 1988-04-19 Schwartz Samuel A Short cathode ray tube
EP0221639A1 (en) * 1985-09-20 1987-05-13 Hitachi, Ltd. Cathode-ray tube
US4808890A (en) * 1985-09-20 1989-02-28 Hitachi, Ltd. Cathode-ray tube
US6617779B1 (en) 2001-10-04 2003-09-09 Samuel A. Schwartz Multi-bend cathode ray tube

Also Published As

Publication number Publication date
CH208840A (de) 1940-02-29
BE433386A (OSRAM) 1939-04-29
FR851959A (fr) 1940-01-19

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