US3558818A - Method of strengtherning a television display tube - Google Patents

Method of strengtherning a television display tube Download PDF

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Publication number
US3558818A
US3558818A US696238A US3558818DA US3558818A US 3558818 A US3558818 A US 3558818A US 696238 A US696238 A US 696238A US 3558818D A US3558818D A US 3558818DA US 3558818 A US3558818 A US 3558818A
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US
United States
Prior art keywords
conical portion
television display
display tube
polyester
strengthening
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
US696238A
Other languages
English (en)
Inventor
Floris Deboer
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
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 US3558818A publication Critical patent/US3558818A/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

  • This invention relates to a method of strengthening a television display tube with a substantially rectangular screen for the purpose of reducing the risk of implosion. More particularly in accordance with the invention the transition region between thewindow and the cone of the completed tube is surrounded by a metallic band so as to obtain a space of substantially wedge-shaped section between the whole or part of the inner surface of the band and the outer surface of the transition regions. Thereafter this space is filled with a mixture consisting of an unsaturated polyester resin, a monomer which is polymerisable therewith and a filler. Subsequently, the mixture is hardened at room temperature in a manner as is usable for this mixture with the aid of a redox system. Part of the metallic band may be surrounded by further metallic bands under stress.
  • thermoplastic synthetic material more particularly polyvinylacetate
  • An object of the present invention is to provide a solution to this problem.
  • the problem of obtaining satisfactory adhesion was solved by using an adhesive layer containing a reducing agent of the kind which is also used in the redox system for hardening the polyester mass.
  • the primary object of this method is to prevent premature polymerisation of the mixture of unsaturated polyester and monomer polymerisable therewith. If better adaptation of the shape of an injection-moulded mass to the shape of the mould or better adhesion of lacquer layers should in this case be obtained, then the beginning of the polymerisation of the mass at the surface covered with primer layer is responsible for this.
  • the polymerisation takes place in the whole of the mass at the same time. Also, a contraction of the mass in the direction of the metal and glass surfaces does not occur. This contraction causes cracks in the mass, but such cracks do not occur when the method according to the invention is used.
  • the inner surface of the metallic band 4, (which is, for example, of aluminum) and the outer surface of the transition region 1 are covered with 30 gm. of a polyvinyl acetate solution consisting of 150 gm. of polyvinyl acetate, 1.5 liters of water to which 1 percent by weight of dimethyl paratoluidine has been added.
  • the metallic band is placed in a holder (now shown). Subsequently the completed television display tube is placed in the metallic band in the manner shown in the FIG.
  • the space of slightly wedge-shaped section between the band 4 and the marginal region 1 is filled with a mass consisting of a mixture having the composition:
  • filler (CaCO 5 gm. of benzyl peroxide
  • This composition may be used at a temperature of the working space between 20 C. and 22C. At a higher temperature the amount of dimethyl paratoluidine is reduced proportionately.
  • the polyester resin used was of the general purpose type and consisted substantially of polyglycol-isophthalatemaleinate and styrene.
  • the band 4 can embrace the tube over part of its width under stress.
  • the band 4 which may possibly consist of two parts can be surrounded by a clamping band after the resin has been poured in and hardened.
  • the band 4 may be positioned so that the aperture of the wedge-shaped space 6 lies adjacent the window side 3 of the tube.
  • a method of strengthening a television display tube having a substantially rectangular window closing one end of a conical portion for the purpose of reducing the risk of implosion comprising the steps of applying to a surface of a metallic band and the surface of the conical portion adjoining the window an adhesive layer containing a reducing agent for hardening a polyester mass, surrounding the conical portion covered with said adhesive layer with said metallic band leaving a space therebetween, filling said space between the metallic band and the conical portion with a mixture consisting of an the adhesive layer is the same as that in the redox system.
  • unsalumtcfj Polyester a monomer which pllymcrlsa' 3.

Landscapes

  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Macromonomer-Based Addition Polymer (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
US696238A 1967-01-18 1968-01-08 Method of strengtherning a television display tube Expired - Lifetime US3558818A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6700756A NL6700756A (xx) 1967-01-18 1967-01-18

Publications (1)

Publication Number Publication Date
US3558818A true US3558818A (en) 1971-01-26

Family

ID=19799017

Family Applications (1)

Application Number Title Priority Date Filing Date
US696238A Expired - Lifetime US3558818A (en) 1967-01-18 1968-01-08 Method of strengtherning a television display tube

Country Status (11)

Country Link
US (1) US3558818A (xx)
AT (1) AT274059B (xx)
BE (1) BE709452A (xx)
CH (1) CH472114A (xx)
DE (1) DE1639343A1 (xx)
DK (1) DK119435B (xx)
ES (1) ES349366A1 (xx)
FR (1) FR1551542A (xx)
GB (1) GB1147312A (xx)
NL (1) NL6700756A (xx)
SE (1) SE325966B (xx)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3835250A (en) * 1970-10-27 1974-09-10 A Kaljuko Explosion-proof cathode-ray tubes
US4218932A (en) * 1977-04-29 1980-08-26 The Gates Rubber Company Belt sprocket wheel
US6737796B2 (en) 2001-05-04 2004-05-18 Thomson Licensing S. A. Cathode-ray tube mounting apparatus

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3220592A (en) * 1962-03-19 1965-11-30 Owens Illinois Glass Co Cathode-ray and other vacuumized tubes resistant to violent devacuation
US3412203A (en) * 1965-08-16 1968-11-19 Mercury Aircraft Inc Tv picture tube and mounting frame assembly

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3220592A (en) * 1962-03-19 1965-11-30 Owens Illinois Glass Co Cathode-ray and other vacuumized tubes resistant to violent devacuation
US3412203A (en) * 1965-08-16 1968-11-19 Mercury Aircraft Inc Tv picture tube and mounting frame assembly

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3835250A (en) * 1970-10-27 1974-09-10 A Kaljuko Explosion-proof cathode-ray tubes
US4218932A (en) * 1977-04-29 1980-08-26 The Gates Rubber Company Belt sprocket wheel
US6737796B2 (en) 2001-05-04 2004-05-18 Thomson Licensing S. A. Cathode-ray tube mounting apparatus

Also Published As

Publication number Publication date
DE1639343A1 (de) 1971-02-04
GB1147312A (en) 1969-04-02
DK119435B (da) 1971-01-04
CH472114A (de) 1969-04-30
NL6700756A (xx) 1968-07-19
AT274059B (de) 1969-09-10
SE325966B (xx) 1970-07-13
ES349366A1 (es) 1969-04-01
FR1551542A (xx) 1968-12-27
BE709452A (xx) 1968-07-16

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