US2100703A - Braun tube and method of producing the same - Google Patents

Braun tube and method of producing the same Download PDF

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Publication number
US2100703A
US2100703A US733996A US73399634A US2100703A US 2100703 A US2100703 A US 2100703A US 733996 A US733996 A US 733996A US 73399634 A US73399634 A US 73399634A US 2100703 A US2100703 A US 2100703A
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United States
Prior art keywords
envelope
bulb
screen
end portion
image receiving
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Expired - Lifetime
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US733996A
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English (en)
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Schlesinger Kurt
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Individual
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Individual
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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
    • H01J29/861—Vessels or containers characterised by the form or the structure thereof
    • 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
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
    • H01J29/18—Luminescent screens
    • H01J29/24—Supports for luminescent material

Definitions

  • the bottom of the bulb is subjected to a comparatively strong tensile strain both at the center as well as more particularly along the line of connection between the bottom of the bulb and the bulb body.
  • relatively large tubes such as are necessary more particularly for television purposes this form of bulb frequently results in implosion.
  • the object of the invention is a Braun tube having a picture receiving screen in the order of more than 15X15 cm., and also a method of producing the same, in which complete proof against implosion is ensured in spite of the great size of the tube.
  • the bulb of the Braun tube is constructed on such lines that tensile strains are unable to take place at all or only to a very small extent.
  • the tube according to the invention may preferably be constructed as a spherical body furnished with a cylindrical neck portion.
  • the spherical body may be replaced by a body which consists of two spherical sections with an intermediate cylindrical portion located between the same.
  • the elevation i. e., the distance between the center of the bottom of the sphere a and the center of the upper cylinder plane must amount to, at least 7 cm. in the case of a cylinder diameter of cm. or more. With a diameter of the cylinder amounting to 34 cm. the elevation will preferably be approximately 10-12 cm.
  • the fluorescent substance may preferably be provided on a plane parallel sheet of glass, which is secured within the bulb, preferably in the vicinity of the bottom thereof.
  • this support for the luminous screen- which may be constructed as a very thin sheet of glass (for example, 0.5-1 mm.) may take place, for example with the use of resilient distance pieces, which engage in corresponding recesses or contractions in the bulb or about elevations provided for this purpose.
  • resilient rings there may conveniently be employed rings composed of material well capable of being outgassed but not resilient in itself, for example phosphor bronze, which rings are pressed apart by means of a spring fitted at a suitable point.
  • attachment means on a ring of this nature, and to mount the support for the luminous screen on these attachment means.
  • the total of the system may be arranged in this neck, and the total length of the tube, i. e., the total derived from the length of the neck of the bulb and of the tube bulb is practically the same in all cases, i. e., both in thecase of gas tubes as well as high vacuum tubes.
  • Fig. 1 shows the basic form of the bulb (having a bulged portion for holding the luminous screen). 7
  • Fig. 2 shows a bulb for high vacuum tubes, the body of which bulb is shortened during the fitting operation, whilst in Fig. 3 there is shown a bulb having a luminous screen held by means of springs engaging in the bulged portion, whilst Fig. 4 shows a tube having a luminous screen held by a single press ring.
  • Fig. 5 shows a tube, in which the luminous screen is held by two press rings.
  • the method may be performed as follows 2 In the first place there is produced in the manner known per se the axially symmetrical bulb comprising the cylindrical neck portion 2, the two spherical parts I and 3, and the cylindrical middle portion II,
  • This bulb is held preferably at the nepk in a suitable device, and rotated about its axis at an even speed.
  • the bulb is thereupon scored by a suitable device along the line A--B, and if desired along the line BO, and the two scored lines subjected to a sudden jump in temperatu e, so that co l y re ular ou dge r formed along the on or oss bl a ne he two straight lines.
  • the luminous screen is thereupon fitted, as described later, and the body of the bulb is again fused together to form a whole, in the case of gastubes along the line AB and in the case ofhigh vacuum tubes along the lines A.,B and B O, by simultaneous rotation of the two parts of the bulb, which preferably are pressed sharply together. 7
  • the fusing .line may conve n be disposed in all cases as far away as possible from the luminous screen.
  • the support 6 carrying the fluorescent substance 5 may be furnished with a mounting 1 consisting, for example, of phosphor bronze, on which mounting there are secured resilient parts 8, which are fitted into the recess 9 in the glass bulb and hold the screen inimmovable fashion.
  • Thenum ber of resilient members 8 distributed along the metallic mounting I may be selected as desired, for example may be 4-42 in number.
  • a press ring which may consist, for example, of the non-resilient metal ring l3, pressed apart. by the spring l4 and furnished with abutments l5.
  • press ring or spring ring
  • the image screen 6 is secured to the abutments 15 in suitable fashion (for example by welding a metallic mounting to. the holding. means l5).
  • the two forms of embodiment last described have the advantage that every deformation of the tube body which might result in a weakening of the tube, and accordingly in an increased danger of implosion, is safely avoided.
  • the luminous screen is produced outside of the bulb, it is possible to make use of the sedimentation process, and in this way to produce luminous screens of a considerably more regular nature.
  • the method according to the invention enables for the first time Braun tubes to be produced, completely secure against implosion, for the production of television images of large size, which tubes in an optical respect are at least equivalent to the known tubes.
  • a cathode ray tube fer television purposes comprising an image receiving screen, said image receiving screen having an area of at least fifteen times fifteen cm., an envelope having a curved end portion and wherein the radius of curvature of the end portion of the envelope is substantially constant throughout the curved end portion, and means for secur-,
  • said means including a metal ring pressed against the inner wall of said envelope, and means for firmly connecting said image receiving screen with said metal ring.
  • a cathode ray tube for television purposes comprising an image receiving screen, said ima re e v creen h vin an are of at least fifteen times fifteen cm., an envelope having a curved end portion and wherein the radius of curvature of the end portion of the envelope is substantially constant throughout the curved end portion, means for securing said image receiving screen within said envelope, said means comprising a non-resilient metal ring, a spring pressing said metal ring against the glass wall of said envelope and means for firmly connecting said image receiving screen to said metal ring.
  • a cathode ray tube for television purposes comprising an image receiving screen, said image receiving screen having an area of at least fifteen times fifteen cm., an envelope having a curved end portion and wherein the radius of curvature of the end portion of theenvelope is substantially constant throughout the curved end portion, and means for securing said image receiving screen within saidenvelope, said means comprising a deformation in the body of said envelope, a metallic frame surrounding said image receiving screen, and a plurality of springs connected to said metallic frame and secured to said deformation.
  • a cathode ray tube for television purposes comprising an envelope having a curved end portion and wherein the radius of curvature of the end portion of the envelope is substantially constant throughout the curved end portion, an image receiving screen, and means for securing said image receiving screen within said envelope, said means comprising a non-resilient metal ring, a spring pressing said metal ring against the glass wall of said envelope, and means for firmly connecting said image receiving screen to said metal ring.
  • a cathode ray tube for television purposes comprising an envelope having a curved end portion and wherein the radius of curvature of the end portion of the envelope is substantially constant throughout the curved end portion, an image receiving screen, and means for securing said image receiving screen within said envelope, said means comprising a deformation in the body of said envelope, a metallic frame surrounding said image receiving screen, and a plurality 'of springs connected to said metallic frame and engaging against said deformation.
  • a cathode ray tube for television purposes comprising an envelope having a curved end portion and wherein the radius of curvature of the end portion of the envelope is substantially constant throughout the curved end portion, an image receiving screen, and means for securing said image receiving screen within said envelope, said means comprising a ring shaped spring member firmly engaging due to its elasticity against the wall of said envelope, and means for firmly connecting said image receiving screen to said ring shaped spring member.
  • a cathode ray tube for television purposes comprising an envelope having a curved end portion and wherein the radius of curvature of the end portion of the envelope is substantially constant throughout the curved end portion, an image receiving screen, and means for securing said image receiving screen within said envelope, said means comprising two ring-shaped spring members mounted adjacent to, and axially aligned with, each other within said envelope and firmly engaging, due to their elasticity, against the wall of said envelope, said screen being disposed between said two members and so supported in position.
  • An envelope for Braun tubes for television purposes comprising a cylindrical portion having a diameter of at least 30 centimetres, two curved portions each attached to one end of said cylindrical portion so as substantially to close off said cylindrical portion at the end to which said curved portion is attached, each of said curved portions having the shape of a part of a hollow sphere facing said cylindrical portion with its concave side, the apex of one of said curved portions having a distance from the virtual base of said curved portion which is at least equal to 7 centimetres, the other one of said curved portions having an opening at its apex, a neck-portion secured to the edge of said opening in a position co-axial with said cylindrical portion, and a picture receiving screen attached to said cylindrical portion at the inside thereof.
  • An envelope for Braun tubes for television purposes comprising a cylindrical portion having a diameter of at least 30 centimetres, two curved portions each attached to one end of said cylindrical portion so as substantially to close oiT said cylindrical portion at the end to which said curved portion is attached, each of said curved portions having the shape of a part of a hollow sphere facing said cylindrical portion with its concave side, the apex of one of said curved portions having a distance from the virtual base of said curved portion which is at least equal to '7 centimetres, the other one of said curved portions having an opening at its apex, a neck-portion secured to the edge of said opening in a position co-axial with said cylindrical portion, and a picture receiving screen attached to the first said curved portion.

Landscapes

  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
US733996A 1933-07-10 1934-07-06 Braun tube and method of producing the same Expired - Lifetime US2100703A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE442519X 1933-07-10

Publications (1)

Publication Number Publication Date
US2100703A true US2100703A (en) 1937-11-30

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US733996A Expired - Lifetime US2100703A (en) 1933-07-10 1934-07-06 Braun tube and method of producing the same

Country Status (4)

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US (1) US2100703A (en:Method)
BE (1) BE404142A (en:Method)
FR (1) FR775686A (en:Method)
GB (1) GB442519A (en:Method)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2425980A (en) * 1944-04-28 1947-08-19 Shelley Kew Edwin Screen for television
US2546828A (en) * 1950-02-17 1951-03-27 Nat Union Radio Corp Target assembly for cathode-ray tubes
US2745981A (en) * 1952-02-21 1956-05-15 American Television Mfg Corp I Mounting means for a vacuum tube electrode assembly
US2959894A (en) * 1955-10-01 1960-11-15 Philips Corp Method of sealing glass members together
US3421038A (en) * 1966-10-03 1969-01-07 Hughes Aircraft Co Storage mesh ring assembly support
US3440469A (en) * 1966-09-01 1969-04-22 Georges Bradu Flat screen attachment inside cathoderay tube by snap ring and clip assembly
US3683224A (en) * 1968-05-13 1972-08-08 Rank Organisation Ltd Low depth cathode ray tubes

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL173574B (nl) * 1952-11-04 Stamicarbon Werkwijze voor het in de grond leggen van kabels, alsmede daarbij te gebruiken band.

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2425980A (en) * 1944-04-28 1947-08-19 Shelley Kew Edwin Screen for television
US2546828A (en) * 1950-02-17 1951-03-27 Nat Union Radio Corp Target assembly for cathode-ray tubes
US2745981A (en) * 1952-02-21 1956-05-15 American Television Mfg Corp I Mounting means for a vacuum tube electrode assembly
US2959894A (en) * 1955-10-01 1960-11-15 Philips Corp Method of sealing glass members together
US3440469A (en) * 1966-09-01 1969-04-22 Georges Bradu Flat screen attachment inside cathoderay tube by snap ring and clip assembly
US3421038A (en) * 1966-10-03 1969-01-07 Hughes Aircraft Co Storage mesh ring assembly support
US3683224A (en) * 1968-05-13 1972-08-08 Rank Organisation Ltd Low depth cathode ray tubes

Also Published As

Publication number Publication date
BE404142A (en:Method)
GB442519A (en) 1936-02-10
FR775686A (fr) 1935-01-07

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