US2378569A - Cathode-ray tube - Google Patents

Cathode-ray tube Download PDF

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Publication number
US2378569A
US2378569A US386266A US38626641A US2378569A US 2378569 A US2378569 A US 2378569A US 386266 A US386266 A US 386266A US 38626641 A US38626641 A US 38626641A US 2378569 A US2378569 A US 2378569A
Authority
US
United States
Prior art keywords
cylinder
cathode
ray tube
emissive layer
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
US386266A
Other languages
English (en)
Inventor
Messner Maximilian
Schantl Erich
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of US2378569A publication Critical patent/US2378569A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J21/00—Vacuum tubes
    • H01J21/36—Tubes with flat electrodes, e.g. disc electrode
    • 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
    • H01J29/48—Electron guns
    • H01J29/484—Eliminating deleterious effects due to thermal effects, electrical or magnetic fields; Preventing unwanted emission

Definitions

  • the cathode is a metal cylinder in which a heating coil is arranged and which at its front end carries the emissive layer. This cylinder expands in accordance with the temperature the cathode acquires.
  • the practice has been to fix the cylinder atthe end (remote from the emissive'layer. As a result, with rising temperaturethe cylinder yexpands toward the control electrode and thus brings the emissive layer nearer to this eleotrode. Therefore, it has been proposed to mount the cylinder by means of a device arranged to Withdraw from the controlr electrode whenever the't'emperature rises. ⁇ Such device, however, is
  • the present invention therefore -proposes that held in position with the aid of supporting means by which it is engaged at ,a zone located in close v,proximity to the emissive layer. In this way, the
  • i cylinder is prevented from expanding toward the control electrode. It will expand instead in the opposite direction, that is, in the direction of its
  • the accompanying drawing is a fragmentary sectional View of a cathode ray tube as provided by the invention.
  • the emissive vlayer, E is tted to one end of a tubular metal cylinder Z, which is closed at this end While its other end is open. Fixed within this cylinder is a heating coil I-I, ⁇ inserted Cylinder Z 'is control electrode S is spaced from the layer E by a desired ldistance aiorded by an insulating ring R that rests against disc T or is formed integral therewith.
  • the parts T, R, S may be held together by a, tubular body D of moulded insulating ⁇ material.
  • a suitable clamping device may be used to hold together by a, tubular body D of moulded insulating ⁇ material.
  • a suitable clamping device may be used for simplicity.
  • the connectors V may be wires or tapes4 and are secured in the. stem of the bulb C in a well-known manner not represented here.
  • f T, R, D, N1, N2, B may be added as a whole to the cathode cylinder, that is, ythe metal cylinder which at one end carries the emissive layer, be
  • the cathode structure is hence exchangeable, and as it is a separate body, the act of arranging the cathode structure may be the last step in the manufacture of such a tube, namely, a step effected with the avoidance of an unduly high sealing temperature.
  • a cathode ray tube having a, cathode structure that comprises a tubular metal cylinder, an
  • emissive layer tted to one end thereof and insulating means to support this cylinder, such/supporting means being fitted to that end of the cyl- 'I'he disc T carrying the cylinder Z is'iitted to it at a zone adjacent to the emissive layer E.
  • the cylinder thus ⁇ has a portion that projects from discT and on the side thereof remote :from layer ⁇ E.
  • Thisfportion is free to expand during the inderwhichcarries the emissive layer while the remaining portion of the cylinder is free to expand, a vheating coil in said cylinder, a pair of rigid Vmetallic rods ⁇ fastened to said supporting means adjacent said cylinder but spaced therefrom, an insulating bridge member joining said rods and supported thereby, a conducting terminal mountet on said bridge member and spaced from said rods, and electrical connections from the cylinder and the ends of the heating coil to said rods and terminal respectively.
  • a cathode ray tube as recited in claim 1 including, a grid mounted on said supporting means in spaced relation with that end of the cylinder which carries the emissive layer.

Landscapes

  • Electrodes For Cathode-Ray Tubes (AREA)
US386266A 1940-03-29 1941-04-01 Cathode-ray tube Expired - Lifetime US2378569A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE218217X 1940-03-29

Publications (1)

Publication Number Publication Date
US2378569A true US2378569A (en) 1945-06-19

Family

ID=5831179

Family Applications (1)

Application Number Title Priority Date Filing Date
US386266A Expired - Lifetime US2378569A (en) 1940-03-29 1941-04-01 Cathode-ray tube

Country Status (5)

Country Link
US (1) US2378569A (is")
BE (1) BE440695A (is")
CH (1) CH218217A (is")
FR (1) FR871120A (is")
NL (1) NL59615C (is")

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2467506A (en) * 1944-08-04 1949-04-19 Farnsworth Res Corp Electron gun
US2523099A (en) * 1947-09-12 1950-09-19 Hartford Nat Bank & Trust Co Electric discharge tube comprising a directional electron beam
US2529134A (en) * 1947-10-02 1950-11-07 Rauland Corp Support for electron guns
US2551871A (en) * 1949-02-11 1951-05-08 Superior Tube Co Thermionic cathode construction
US2716199A (en) * 1951-01-26 1955-08-23 Hartford Nat Bank & Trust Co Electric discharge tube for short waves
US2732512A (en) * 1956-01-24 briggs
US2764708A (en) * 1953-03-20 1956-09-25 Int Standard Electric Corp Electron discharge devices
US3465195A (en) * 1967-03-10 1969-09-02 Funkwerk Erfurt Veb K Shock and vibration-resistant arrangement for cathodes of small heating power

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2732512A (en) * 1956-01-24 briggs
US2467506A (en) * 1944-08-04 1949-04-19 Farnsworth Res Corp Electron gun
US2523099A (en) * 1947-09-12 1950-09-19 Hartford Nat Bank & Trust Co Electric discharge tube comprising a directional electron beam
US2529134A (en) * 1947-10-02 1950-11-07 Rauland Corp Support for electron guns
US2551871A (en) * 1949-02-11 1951-05-08 Superior Tube Co Thermionic cathode construction
US2716199A (en) * 1951-01-26 1955-08-23 Hartford Nat Bank & Trust Co Electric discharge tube for short waves
US2764708A (en) * 1953-03-20 1956-09-25 Int Standard Electric Corp Electron discharge devices
US3465195A (en) * 1967-03-10 1969-09-02 Funkwerk Erfurt Veb K Shock and vibration-resistant arrangement for cathodes of small heating power

Also Published As

Publication number Publication date
NL59615C (is")
FR871120A (fr) 1942-04-09
BE440695A (is")
CH218217A (de) 1941-11-30

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