US3278682A - Implosion-resistant cathode-ray tube with mounting brackets - Google Patents

Implosion-resistant cathode-ray tube with mounting brackets Download PDF

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Publication number
US3278682A
US3278682A US355857A US35585764A US3278682A US 3278682 A US3278682 A US 3278682A US 355857 A US355857 A US 355857A US 35585764 A US35585764 A US 35585764A US 3278682 A US3278682 A US 3278682A
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US
United States
Prior art keywords
band
lugs
bulb
glass
ray tube
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
US355857A
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English (en)
Inventor
Panis Constantius Jo Walterhus
Boer Floris De
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.)
US Philips Corp
North American Philips Co Inc
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US Philips Corp
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 US Philips Corp filed Critical US Philips Corp
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Publication of US3278682A publication Critical patent/US3278682A/en
Anticipated expiration legal-status Critical
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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
    • H01J29/86—Vessels; Containers; Vacuum locks
    • H01J29/87—Arrangements for preventing or limiting effects of implosion of vessels or containers

Definitions

  • This invention relates to cathode-ray tubes for television display, comprising a glass bulb having its zone adjoining the image surface surrounded by a metal band which exerts substantially no pressure on the bulb, the space between the band and the glass bulb of the tube being filled with a solid filler, and lugs being provided for securing the tube in a cabinet.
  • the lugs have sometimes been fixed under a metal band which is clamped around the bulb.
  • the lugs can be fixed in a layer of synthetic substance, but in this case a metal band was not provided and the layer of synthetic substance had been reinforced by the addition of glass fibres.
  • the lugs in the form of rectangularly bent plates can have a fiat portion clamped under the strip. During the tightening of the clamping device, however, the lugs are apt to be shifted in position due to the tensioning of the band.
  • the metal band When use is made of a metal band it seems eflicient to weld the lugs to the band, but in this case the distance between the lugs and the front of the glass window is not accurately determined since the tolerances of the glass, especially of the window, now also play a part, that is to say the convexity of the window may vary.
  • Another disadvantage consists in that the metal band, if it consists of a single ring which must be slipped from the front of the tube onto the portion of the bulb of the largest crosssection, must have a greater width if the rectangularly bent lugs are previously welded to the inner side of the ring.
  • the welding operation has a further limitation in that stresses can be produced in the band and cause it to warp when taken out of the welding jig, as a result of which the lugs are no longer co-planar.
  • the securement of the lugs to the band has still further disadvantages, as will appear hereinafter.
  • each of the lugs located between the band and the bulb is held solely by the solid filler.
  • This portion of each lug is then preferably provided with a few peripheral recesses in order to increase the hold of the filler on this portion.
  • the lugs can be provided after the metal band has been arranged around the bulb, the gap between the bulb and the band need not be particularly wide since the portion of the bulb having the greatest transverse dimensions need no longer slide along the portions of the lugs located inside the band. Since the material of the lugs is com-. paratively thick (2.5 mm.) and mostly four lugsare provided, this makes a considerable difference for the width of the gap at the lugs. The saving in filler is consequently considerable.
  • FIGURE 1 shows part of a cathode-ray tube in accordance with the invention
  • FIGURE 2 is a perspective view of a lug
  • FIGURE 3 shows a detail of a band of other design.
  • FIGURE 4 shows a detail of the bulb prior to pouring the filler into the gap between the band and the bulb.
  • the reference numeral 1 denotes a glass window of a cathode-ray tube which is sealed at 3 to a glass cone 2.
  • the cone 2 is coated with a thin layer 4 consisting of glass tissue impregnated with a synthetic substance.
  • a band 5 which has the shape of a profiled metal ring, is arranged around the bulb so that the bulb engages an edge 6 of the band 5.
  • this edge conforms to the surface of the window so that the tolerance deviations of the glass cause deformation of the band. Consequently, lugs secured to the band would leave their planes and, upon fastening by screws in the receiver cabinet, would give rise to deformation of the band and to stresses in the bulb and in the receiver cabinet.
  • a direct contact between the edge 6 and the bulb 1 is avoided by previously coating the glass with a layer of glue or providing spacers between the edge 6 and the glass.
  • the band 5 At its top the band 5 has a portion 7 of constant crosssection. The cross-section of the portion 7 must exceed the greatest transverse dimensions of the bulb.
  • the tube is suspended by means of lugs 8 comprising rectangularly bent metal plates each having an aperture 10. If the portion 9 of the lugs 8 were welded to the band beforehand the diagonal of the portion 7 would have to be greater for twice the thickness of the material of the lugs. As a result, the gap between the band 5 and the bulb 1 would locally become equally wider so that the content of the gap and hence the quantity of filler 11 would be much greater. Besides, the reinforcement of the bulb becomes greater as the gap has a smaller width.
  • FIGURE 2 shows the manner in which the portion 9 of each lug is bent cylindrically and provided with recesses 12, so that the filler 11 has a better hold on the lugs.
  • the filler is preferably a synthetic substance satisfactorily adhering to the glass and the band and hence also to the material of the lugs. Such fillers may be those disclosed in US. Patent 3,206,056 and in copending US. application Serial No. 170,639, filed February 2, 1962.
  • the tube is placed, as shown in FIGURE 4, in a mold or a support 14 in which provision is made of a flexible sealing edge 15, consisting of sponge rubber, and also of spacers 16.
  • the bulb is pulled downwards by means of suction devices (not shown) placed on the center of the window and connected to a vacuum line. Since the window of the bulb then comes to bear on the spacers 16 the flexible ring is depressed only with a slight force, so that excessive deformation of the band does not occur and yet the gap between the edge 6 and the glass is satisfactorily sealed notwithstanding the fact that, as viewed along the circumference, the edge 6 is arcuated since it follows the curvature of the edge of the display screen.
  • the flexible ring 15 has a greater thickness on its outer side, resulting in a more satisfactory seal being obtained.
  • the lugs 8 are accurately fixed in their correct position by means of jigs 17 and, where necessary, pins 18 fitting in the apertures of the lugs, completely independent of the band 5. Since the distance between the lugs and the base plate 14 is accurately determined, as is that between the upper sides of the spacers 16 and this base plate, the distance H between the lugs and the edge of the screen is also fixed, completely independent of the tolerances of the glass or of deformation of the band.
  • a cathode-ray tube comprising a glass envelope having a cone portion and an adjoining window portion, a rigid band surrounding the juncture between the window portion and the cone portion and spaced therefrom thereby exerting substantially no pressure on the envelope, a solid filler material filling the space between the band and the envelope, and mounting members for securing the tube to a housing, said mounting members each comprising a rectangularly-bent metal plate one portion of which is provided with an aperture, one portion of said metal plate being securely positioned in said filler material, the other portion of said metal plate extending radially beyond the filler material.
  • a cathode-ray tube comprising a glass envelope having a cone portion and an adjoining window portion, a rigid band surrounding the juncture between the Window portion and the cone portion and spaced therefrom thereby exerting substantially no pressure on the envelope, a solid filler material filling the space between the band and the envelope, and mounting members for securing said tube to a housing, said mounting members each comprising a rectangularly-bent metal plate one portion of which is provided with an aperture, one portion of said metal plate having reentrant portions and extending into said filler material and being securely position therein, the other porton of said metal plate extending radially beyond the filler material.
  • a cathode-ray tube comprising a glass envelope having a cone portion and an adjoining window portion, a rigid metal band surrounding the juncture between the window portion and the cone portion and spaced therefrom thereby exerting substantially no pressure on the envelope, a solid filler material adhering poorly to glass and metal filling the space between the band and the envelope, said metal band having protruding portions on the side adjacent the Window portion to anchor the band in the filler material, and mounting members for securing the tube to a housing, said mounting members each comprising a rectangularly-bent metal plate one portion of which is provided with an aperture, one portion of the metal plate being securely positioned in said filler mate rial, the other portion of said metal plate extending radially beyond the filler material.

Landscapes

  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
US355857A 1963-04-03 1964-03-30 Implosion-resistant cathode-ray tube with mounting brackets Expired - Lifetime US3278682A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL291096 1963-04-03

Publications (1)

Publication Number Publication Date
US3278682A true US3278682A (en) 1966-10-11

Family

ID=19754593

Family Applications (1)

Application Number Title Priority Date Filing Date
US355857A Expired - Lifetime US3278682A (en) 1963-04-03 1964-03-30 Implosion-resistant cathode-ray tube with mounting brackets

Country Status (9)

Country Link
US (1) US3278682A (da)
AT (1) AT242761B (da)
BE (1) BE646060A (da)
CH (1) CH418473A (da)
DE (1) DE1224843B (da)
DK (1) DK107822C (da)
ES (1) ES298182A1 (da)
GB (1) GB1005485A (da)
NL (1) NL291096A (da)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3377504A (en) * 1964-06-27 1968-04-09 Chirana Praha X-ray image intensifier tube with magnetically shielding mounting sleeve secured to envelope
US3422220A (en) * 1965-06-09 1969-01-14 Philips Corp Color television display tube with ferromagnetic screening member
US3508310A (en) * 1967-07-08 1970-04-28 Philips Corp Method of manufacturing an implosion-free television display tube
US3512674A (en) * 1965-11-01 1970-05-19 Standard Elektrik Lorenz Ag Frame for jacketing the glass bulb of picture tubes for implosion-protection
US3569990A (en) * 1967-03-03 1971-03-09 Thorn Radio Valves And Tubes L Implosion protection apparatus for cathode ray tubes
US3573368A (en) * 1967-05-11 1971-04-06 Philips Corp Cathode-ray tube implosion guard with beeswax annular metal frame and metal band
US3730990A (en) * 1969-08-01 1973-05-01 Hitachi Ltd Implosion-proof cathode-ray tube
US3835250A (en) * 1970-10-27 1974-09-10 A Kaljuko Explosion-proof cathode-ray tubes
US6737796B2 (en) 2001-05-04 2004-05-18 Thomson Licensing S. A. Cathode-ray tube mounting apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4483452A (en) * 1981-12-07 1984-11-20 Corning Glass Works Television bulb

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2851679A (en) * 1956-07-24 1958-09-09 E H Titchener & Co Holders for television tubes and other objects
US2874017A (en) * 1956-11-07 1959-02-17 Owens Illinois Glass Co Prevention of fracture in glass cathode-ray tubes
CA607500A (en) * 1960-10-25 V. Pringle Frank Mounting assembly for cathode ray tubes
US3220593A (en) * 1962-03-19 1965-11-30 Owens Illinois Glass Co Cathode-ray and other vacuumized tubes resistant to fracture and capable of controlled devacuation

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA607500A (en) * 1960-10-25 V. Pringle Frank Mounting assembly for cathode ray tubes
US2851679A (en) * 1956-07-24 1958-09-09 E H Titchener & Co Holders for television tubes and other objects
US2874017A (en) * 1956-11-07 1959-02-17 Owens Illinois Glass Co Prevention of fracture in glass cathode-ray tubes
US3220593A (en) * 1962-03-19 1965-11-30 Owens Illinois Glass Co Cathode-ray and other vacuumized tubes resistant to fracture and capable of controlled devacuation

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3377504A (en) * 1964-06-27 1968-04-09 Chirana Praha X-ray image intensifier tube with magnetically shielding mounting sleeve secured to envelope
US3422220A (en) * 1965-06-09 1969-01-14 Philips Corp Color television display tube with ferromagnetic screening member
US3512674A (en) * 1965-11-01 1970-05-19 Standard Elektrik Lorenz Ag Frame for jacketing the glass bulb of picture tubes for implosion-protection
US3569990A (en) * 1967-03-03 1971-03-09 Thorn Radio Valves And Tubes L Implosion protection apparatus for cathode ray tubes
US3573368A (en) * 1967-05-11 1971-04-06 Philips Corp Cathode-ray tube implosion guard with beeswax annular metal frame and metal band
US3508310A (en) * 1967-07-08 1970-04-28 Philips Corp Method of manufacturing an implosion-free television display tube
US3730990A (en) * 1969-08-01 1973-05-01 Hitachi Ltd Implosion-proof cathode-ray tube
US3835250A (en) * 1970-10-27 1974-09-10 A Kaljuko Explosion-proof cathode-ray tubes
US6737796B2 (en) 2001-05-04 2004-05-18 Thomson Licensing S. A. Cathode-ray tube mounting apparatus

Also Published As

Publication number Publication date
BE646060A (da) 1964-10-02
ES298182A1 (es) 1964-06-01
NL291096A (da)
AT242761B (de) 1965-10-11
DE1224843B (de) 1966-09-15
DK107822C (da) 1967-07-10
CH418473A (de) 1966-08-15
GB1005485A (en) 1965-09-22

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