US2222197A - Braun tube - Google Patents

Braun tube Download PDF

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Publication number
US2222197A
US2222197A US203549A US20354938A US2222197A US 2222197 A US2222197 A US 2222197A US 203549 A US203549 A US 203549A US 20354938 A US20354938 A US 20354938A US 2222197 A US2222197 A US 2222197A
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US
United States
Prior art keywords
tube
plate
jacket
curvature
pressure
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
US203549A
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English (en)
Inventor
Engels Bernhard
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of US2222197A publication Critical patent/US2222197A/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
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/86—Vessels; Containers; Vacuum locks
    • H01J29/87—Arrangements for preventing or limiting effects of implosion of vessels or containers

Definitions

  • the image cathode ray oscillographs in the form of the so-called Braun tube.
  • This consists of a Vdischarge tube which is suitably evacuated until almost absolute vacuum, with a cathode connected on to negative potential as the source of the rays, an anode usually earthed, a diaphragm also earthed, allowing the passage of a narrow beam of rays, one or more deflecting condensers or deecting coils and a luminous screen perpendicular to the path of the cathode rays, which is arranged directly in front of or on the inner surface of the end of the tube oppositethe cathode.
  • Such Braun tubes were at first made com pletely of glass and this in the usual Way by blowing in a mould. In this way, however, such tubes could only be made up to limited dimensions determined by the working conditions applying with this method of shaping, and it was hardly possible to go beyond 20 cm. in the diameterof the reception end of the tube having the form if an Erlenmeyer bulb.
  • This limitation carries with it a limitation of the images received on the surface given in this way, with respect to their size, vwhich limitation is very undesirable.
  • a further disadvantage of the blown tubes lies in the fact that in the production by blowing the glass is never plane-parallel but shows uctuations in thickness and certain distortions.
  • the tube which may consist of glass or metal, a spherical cap-shaped mirror glass plate of flat curvature, ground and pol- 30 ished plane-parallel, which rests tightly along a flat and/or circularly curved-and thus in both cases easily worked-surface on a corre sponding surface of the tube jacket and is thus joined thereto.
  • An absolutely secure vacuum- 35 tight closing can here be'attained either by cementing or by fusing, according to recent processes, with the tube wall.
  • Such a closing of the tube by a spherically curved mirror glass plate represents the best form of construction for taking the pressure stresses, it being possible according to the diameter of the end of the tube to select the curvature of the mirror glass plate bearing in mind the pressure stresses to be taken thereby, i. e., to make the curvature so great as 45 is necessary for taking these stresses.
  • FIG. 1 represents a longitudinal section through the end l part of the improved tube, at the same time illustrating on the left-hand andon the righthand halves, different possibilities for the tight uniting of the closing plate with the tube
  • Fig. 2 is a fragmentary sectional view of a tube l5 showing the end plate in its initial andl nal positions.
  • a represents the jacket of the tube, which Vfor example consists of metal
  • b indicates the end piece, consisting of a cap or 20 dome-shaped mirror glass disc, uniformly curved all over and ground and polished plane-parallel, the radius of curvature of which is approximately equal to the greatest diameter of the cap or dome and over which is applied in known 25 manner the luminous screen if this is not arranged independently thereof in front of the end of the tube.
  • This counter-surface can preferably also be provided with grooves g and such grooves can also 40 be ground into the edge surface of the mirror glass plate in order in this way to still further ensure the vacuum-tight connection.
  • a ring i is fitted round the flange, preferably under tension.
  • Fig. 2 represents in exaggerated form an end plate b having an initially spherical curvature mounted over the end of the tube body a. Subsequent evacuation of the body of the tube causes the end plate b to assume its final level position which may be that indicated in dotted lines. While in the form shown the flnal position of the end plate is planar, it will be appreciated that any desired final curvature may be attained, so long as it is caused by distortion of a plate having initially spherical curvature.
  • a Braun tube including a jacket containing gas under sub-atmospheric pressure, an end member seated in said jacket having plane parallel surfaces, one of which is coated, and sealing means surrounding said end member, said end member being formed as a spherically formed plate and being suiliciently flexible to be bent by the diilerential pressure between the interior and exterior of the jacket into a plane position and being held in its plane position by the pressure diierence between the exterior and the interior of said jacket.
  • a Braun tube in accordance with claim 1 in which the peripheral surface of said end member is parallel to its-seat in said jacket and is maintained in parallelism by the pressure of the atmosphere.

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)
US203549A 1935-11-05 1938-04-22 Braun tube Expired - Lifetime US2222197A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE2222197X 1935-11-05
GB9220/38A GB493602A (en) 1935-11-05 1938-03-25 Improvements in braun tubes for television
NL87093A NL49779C (enrdf_load_stackoverflow) 1935-11-05 1938-03-26
FR836063T 1938-04-02

Publications (1)

Publication Number Publication Date
US2222197A true US2222197A (en) 1940-11-19

Family

ID=32070948

Family Applications (1)

Application Number Title Priority Date Filing Date
US203549A Expired - Lifetime US2222197A (en) 1935-11-05 1938-04-22 Braun tube

Country Status (4)

Country Link
US (1) US2222197A (enrdf_load_stackoverflow)
FR (1) FR836063A (enrdf_load_stackoverflow)
GB (1) GB493602A (enrdf_load_stackoverflow)
NL (1) NL49779C (enrdf_load_stackoverflow)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2503813A (en) * 1949-01-27 1950-04-11 Richard A Fisch Insulated shield for metal backed television tubes
US2562163A (en) * 1949-03-01 1951-07-31 Philips Lab Inc Electric discharge tube
US2697311A (en) * 1949-12-19 1954-12-21 Polan Ind Inc Method of making glass tube envelopes
US2699510A (en) * 1951-02-24 1955-01-11 Hartford Nat Bank & Trust Co Cathode-ray tube
US2728009A (en) * 1950-11-14 1955-12-20 Rca Corp Cathode-ray tube with target support
US2740062A (en) * 1952-05-27 1956-03-27 Rca Corp Cathode ray picture tube
US2753073A (en) * 1949-12-15 1956-07-03 Rca Corp Seal for composite cathode ray tubes
US2760119A (en) * 1952-01-15 1956-08-21 Products And Licensing Corp Mural television screen
US2785820A (en) * 1952-06-28 1957-03-19 Owens Illinois Glass Co Controlling implosions in cathode ray and other tubes
US4021850A (en) * 1975-10-20 1977-05-03 Zenith Radio Corporation Color television picture tubes with improved implosion protection system
US4037255A (en) * 1975-12-11 1977-07-19 Zenith Radio Corporation Implosion protection system for color CRT bulb having a bonded funnel frame
US4054913A (en) * 1976-09-01 1977-10-18 Zenith Radio Corporation Hybrid implosion protection system for a flangeless faceplate color cathode ray tube and method of assembly thereof
US4100451A (en) * 1974-08-19 1978-07-11 Zenith Radio Corporation Face panel assembly for a color cathode ray tube
US4119234A (en) * 1975-03-27 1978-10-10 Siemens Aktiengesellschaft Vacuum-tight windows for passage of X-rays or similar penetrating radiation
US5293096A (en) * 1991-06-13 1994-03-08 Mitsubishi Denki Kabushiki Kaisha Cathode ray tube device having insulator coating
US5304890A (en) * 1991-01-16 1994-04-19 Mitsubishi Denki Kabushiki Kaisha Cathode ray tube device having reinforcing frame
DE4244755C2 (de) * 1991-01-16 1998-08-13 Mitsubishi Electric Corp Kathodenstrahlröhre

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1598888A (en) * 1978-05-30 1981-09-23 Philips Electronic Associated Electron display tubes

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2503813A (en) * 1949-01-27 1950-04-11 Richard A Fisch Insulated shield for metal backed television tubes
US2562163A (en) * 1949-03-01 1951-07-31 Philips Lab Inc Electric discharge tube
US2753073A (en) * 1949-12-15 1956-07-03 Rca Corp Seal for composite cathode ray tubes
US2697311A (en) * 1949-12-19 1954-12-21 Polan Ind Inc Method of making glass tube envelopes
US2728009A (en) * 1950-11-14 1955-12-20 Rca Corp Cathode-ray tube with target support
US2699510A (en) * 1951-02-24 1955-01-11 Hartford Nat Bank & Trust Co Cathode-ray tube
US2760119A (en) * 1952-01-15 1956-08-21 Products And Licensing Corp Mural television screen
US2740062A (en) * 1952-05-27 1956-03-27 Rca Corp Cathode ray picture tube
US2785820A (en) * 1952-06-28 1957-03-19 Owens Illinois Glass Co Controlling implosions in cathode ray and other tubes
US4100451A (en) * 1974-08-19 1978-07-11 Zenith Radio Corporation Face panel assembly for a color cathode ray tube
US4119234A (en) * 1975-03-27 1978-10-10 Siemens Aktiengesellschaft Vacuum-tight windows for passage of X-rays or similar penetrating radiation
US4021850A (en) * 1975-10-20 1977-05-03 Zenith Radio Corporation Color television picture tubes with improved implosion protection system
US4037255A (en) * 1975-12-11 1977-07-19 Zenith Radio Corporation Implosion protection system for color CRT bulb having a bonded funnel frame
US4054913A (en) * 1976-09-01 1977-10-18 Zenith Radio Corporation Hybrid implosion protection system for a flangeless faceplate color cathode ray tube and method of assembly thereof
US5304890A (en) * 1991-01-16 1994-04-19 Mitsubishi Denki Kabushiki Kaisha Cathode ray tube device having reinforcing frame
DE4244755C2 (de) * 1991-01-16 1998-08-13 Mitsubishi Electric Corp Kathodenstrahlröhre
US5293096A (en) * 1991-06-13 1994-03-08 Mitsubishi Denki Kabushiki Kaisha Cathode ray tube device having insulator coating

Also Published As

Publication number Publication date
GB493602A (en) 1938-10-11
NL49779C (enrdf_load_stackoverflow) 1941-01-15
FR836063A (fr) 1939-01-10

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