US2799422A - Cathode-ray tube having a glass cone - Google Patents

Cathode-ray tube having a glass cone Download PDF

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Publication number
US2799422A
US2799422A US517885A US51788555A US2799422A US 2799422 A US2799422 A US 2799422A US 517885 A US517885 A US 517885A US 51788555 A US51788555 A US 51788555A US 2799422 A US2799422 A US 2799422A
Authority
US
United States
Prior art keywords
glass
ring
window
cathode
cone
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
US517885A
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English (en)
Inventor
Hagenberg Theodorus
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
Original Assignee
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
Application granted granted Critical
Publication of US2799422A publication Critical patent/US2799422A/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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
    • H01J5/20—Seals between parts of vessels
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
    • H01J5/20—Seals between parts of vessels
    • H01J5/22—Vacuum-tight joints between parts of vessel
    • H01J5/26—Vacuum-tight joints between parts of vessel between insulating and conductive parts of vessel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0033—Vacuum connection techniques applicable to discharge tubes and lamps
    • H01J2893/0037—Solid sealing members other than lamp bases
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0033—Vacuum connection techniques applicable to discharge tubes and lamps
    • H01J2893/0037—Solid sealing members other than lamp bases
    • H01J2893/0041—Direct connection between insulating and metal elements, in particular via glass material
    • H01J2893/0043—Glass-to-metal or quartz-to-metal, e.g. by soldering

Definitions

  • the invention relates to a cathode-ray tube, more particularly a television tube, having a rectangular glass window and a glass cone, the seal between window and cone being reinforced by means of a metal ring.
  • the glass particularly that of the window, must have a large thickness or this window must be strongly curved.
  • the weight of such tubes is great, whilst the image is deformed owing to the large thickness of the glass or the strong curvature of the window.
  • Such tubes it is moreover difiicult to manufacture the window free from inperfections.
  • it is diflicult to seal such a thick glass window to the glass cone, since the thickness of the glass at the area of the seal must be still larger.
  • the thickness of the glass may be smaller and the window may be manufactured from plate glass, which is completely free from imperfections.
  • a seal with which the ring is coated on the inner side of the tube is obtained only with difficulty. If the glass parts are positioned one upon the other in the cold state, the ring surrounding them, the ring will become hot first when heated by means of burners or high-frequency currents and owing to the expansion it will get loose from the glass parts. Therefore the heating of the glass parts throughout their thickness will give rise to difficulties and a complete sealing will practically not occur, particularly since we are concerned with glass parts having a fairly large wall thickness (6 to 8 mms.).
  • the glass nearest the ring melts, flows along the ring around the seam between the glass parts and screens off this scam to a greater or smaller extent from the hot ring, so that on the inner side of the tube the seam subsists and the glass parts are not satisfactorily sealed to one another.
  • a ring contributes comparatively little to the rigidity of the sealing zone, since the glass is subjected not only to pressure, but also to off-setting and bending. It is furthermore a problem how to support the ring during the sealing operation.
  • the said disadvantages may be completely obviated with a cathode-ray tube comprising a glass window and a glass, cone, which are sealed together, the sealing edge being reinforced by means of a metal ring, it the metal ring has a cross section in the shape of a T, the leg of which is completely sealed in the glass and is shorter than the thickness of the glass wall of the. cone at that area.
  • This shape of the ring has various great advantages.
  • the ring may be made by bending a rod having a T profile, the ends of which can be welded to one another by the material itself in a reducing or inert atmosphere for example by means of an argon are weld.
  • the glass of the edge of the window melts to the ring and flows finally smoothly over the inner edge of the leg of the T down to mix with the hot edge of the cone.
  • the metal of the ring on the inner side of the tube is thus completely coated.
  • the glass parts are held in gaps, they are subjected practically only to pressure by the ring, so that the risk of cracks is materially reduced.
  • the ring may be made of comparativlcy thin material, since the fairly thick glass layer coating the inner side of the ring has great rigidity.
  • Fig. l is a sectional view of the seal prior to the sealing operation
  • Fig. 2 is a sectional view of the seal subsequent to the sealing operation
  • Fig. 3 is a lateral view of a cathode-ray tube according to the invention.
  • reference numeral 1 designates the glass window, preferably made of plate glass
  • 2 designates the glass cone and 3 the supporting ring according to the invention. In the cold state these component parts are positioned one upon the other as is illustarted in Fig. 1.
  • the edges of the cone and the window are adjacent the inner edge or leg 4 of the T-shaped profile of the ring 3, which includes a top portion surrounding and abutting the junction of the conical and window portions. If the ring 3 expands during heating, the edges of the window 1 and the cone 2 remain in contact with the edge 4, so that an eliicient heating of the glass edges is realized.
  • the edge 4 forms gaps with the ring 3, in which gaps the glass is collected during melting, a saitsfactory seal of this glass to the ring is obtained.
  • the leg 4 has a smaller length than the thickness of the cone wall at this area, the liquid glass of the window is capable of sealing completely with that of the cone, as is shown in uninterrupted glass layer contributes materially to the rigidity of the sealing Zone, so that the ring 3, which is preferably made of ferrochromium, need exhibit only a small wall thickness and may thus be cheap.
  • the ring may be made from a rod having a T-profile, both for tubes having circular windows or rectangular windows, substantially no material is wasted.
  • the upright edge of the ring tapers from the inner side to the outer side, for example by 3 and if itjexhibits rounded-oft edges. Since the metal ring 3 is coated on the inner side of the tube, there is no risk of a charge or of corrosion during the operation, the cleaning of the bulb or the manufacture of the screen.
  • Fig. 3 shows the finished tube.
  • the thickness of the window may be approximately may be placed one upon that the ring need not be ring gets loose at its Fig. 2. The thick,
  • a cathode-ray tube having an envelope constituted of a glass, window portion and a glass, substantially conical portion sealed together at their junction, said conical portion having a given Wall thickness at its junction with the window portion, and a metal ring having a T-shaped cross-section and including a top portion surrounding the junction of the sealed glass portions and a leg portion sealed between the window and conical portions, said leg portion having a shorter length than said given thickness of said conical wall portion at the junction, said leg portion being completely covered by glass sealing together sadi window and conicalportions and thus said metal ring being inaccessible from the interior of said envelope.
  • a cathode-ray tube having an envelope constituted of a glass, window portion and a glass, substantially conical portion sealed together at their junction, said conical portion having a given wall thickness at its junction with the window portion, and a thin metal ring having a T- shaped cross-section and including a top portion surrounding and abutting the junction of the sealed glass portions and a leg portion sealed between the window and conical portions, said leg portion having a shorter length than said given thickness of said conical wall portion at the junction, said leg portion being completely covered by glass sealing together said Window and conical portions and thus said metal ring being inaccessible from the interior of said envelope.

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)
  • Vessels And Coating Films For Discharge Lamps (AREA)
US517885A 1954-07-06 1955-06-24 Cathode-ray tube having a glass cone Expired - Lifetime US2799422A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL329551X 1954-07-06

Publications (1)

Publication Number Publication Date
US2799422A true US2799422A (en) 1957-07-16

Family

ID=19784298

Family Applications (1)

Application Number Title Priority Date Filing Date
US517885A Expired - Lifetime US2799422A (en) 1954-07-06 1955-06-24 Cathode-ray tube having a glass cone

Country Status (6)

Country Link
US (1) US2799422A (enrdf_load_stackoverflow)
BE (1) BE539531A (enrdf_load_stackoverflow)
CH (1) CH329551A (enrdf_load_stackoverflow)
DE (1) DE948995C (enrdf_load_stackoverflow)
FR (1) FR1127173A (enrdf_load_stackoverflow)
GB (1) GB780827A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4029898A (en) * 1976-03-24 1977-06-14 Corning Glass Works Television picture tube face plate
US5248914A (en) * 1990-12-26 1993-09-28 Zenith Electronics Corporation In process tension mask CRT panel with peripheral bodies
WO2000001219A1 (en) 1998-07-06 2000-01-13 Rain Bird Sprinkler Manufacturing Corporation Irrigation tube with flexible margin

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1402851A (fr) * 1963-11-22 1965-06-18 Loing Verreries Procédé pour le ceinturage de récipients en verre, par exemple d'ampoules de télévision

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1293441A (en) * 1918-01-04 1919-02-04 Western Electric Co Combined metal and glass structure and method of forming same.
US2498644A (en) * 1945-06-15 1950-02-28 Int Standard Electric Corp Method of manufacturing a metal to glass seal
FR1005363A (fr) * 1948-02-12 1952-04-09 Procédé pour l'obtention de scellements étanches

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1293441A (en) * 1918-01-04 1919-02-04 Western Electric Co Combined metal and glass structure and method of forming same.
US2498644A (en) * 1945-06-15 1950-02-28 Int Standard Electric Corp Method of manufacturing a metal to glass seal
FR1005363A (fr) * 1948-02-12 1952-04-09 Procédé pour l'obtention de scellements étanches
FR57285E (fr) * 1948-02-12 1952-12-31 Procédés pour l'obtention de scellements étanches

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4029898A (en) * 1976-03-24 1977-06-14 Corning Glass Works Television picture tube face plate
US5248914A (en) * 1990-12-26 1993-09-28 Zenith Electronics Corporation In process tension mask CRT panel with peripheral bodies
WO2000001219A1 (en) 1998-07-06 2000-01-13 Rain Bird Sprinkler Manufacturing Corporation Irrigation tube with flexible margin

Also Published As

Publication number Publication date
CH329551A (de) 1958-04-30
BE539531A (enrdf_load_stackoverflow)
GB780827A (en) 1957-08-07
FR1127173A (fr) 1956-12-10
DE948995C (de) 1956-09-13

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