US2785821A - Cathode-ray tube - Google Patents

Cathode-ray tube Download PDF

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Publication number
US2785821A
US2785821A US423123A US42312354A US2785821A US 2785821 A US2785821 A US 2785821A US 423123 A US423123 A US 423123A US 42312354 A US42312354 A US 42312354A US 2785821 A US2785821 A US 2785821A
Authority
US
United States
Prior art keywords
cone
edge
cathode
ray tube
metal
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
US423123A
Other languages
English (en)
Inventor
Vermaas Henricus Gerbra Pieter
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 US2785821A publication Critical patent/US2785821A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C27/00—Joining pieces of glass to pieces of other inorganic material; Joining glass to glass other than by fusing
    • C03C27/02—Joining pieces of glass to pieces of other inorganic material; Joining glass to glass other than by fusing by fusing glass directly to metal
    • 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 window is, in general, sealed to the cone in such a manner that part of the metal edge of the cone slightly projects above the outer surface of the glass of the seal, the metal edge constituting a protecting rim for the sealing edge.
  • a cathode-ray tube comprising a glass window which is sealed to a metal cone so that the edge of the cone slightly projects beyond the seal
  • said disadvantage is greatly reduced by providing that, in accordance with the invention, the wall thickness of the edge of the cone, approximately flush with the outer surface of the glass of the seal, is locally smaller than that of that part of the edge of the cone which is situated at the seal.
  • the outer edge of the cone is preferably provided with an encircling groove, about opposite the point where the edge of the glass window is sealed to the metal wall.
  • the invention is of particular importance for cones having a substantially rectangular shape, since in this case notably the centre of the long sides of the rectangle is very sensitive to shocks on the inner side of the rim.
  • the reference numeral 1 denotes the glass window which is sealed into the edge 6 of the cone 2 made, for example, from chrome iron.
  • the edge of the cone slightly extends beyond the seal and constitutes a rim 3.
  • the wall thickness of the edge 6 of the cone which is approximately 2.5 mm., is locally reduced to say one half by means of a groove 5 shown in Fig. l which is provided approximately opposite the outer surface 4 of the glass of the seal.
  • the groove 5 may alternatively be provided internally of the edge, just above the glass surface 4.
  • the groove may be 1 to 2 mm. wide. It is found that the evacuated tube can now be tested at an excess pressure of 3.5 atmos. instead of 1.7 atmos. as customary, which confirms that the to bustness of the bulb has appreciably increased.
  • the tube is also much more resistant to impact internally of the rim 3.
  • Fig. 2 two grooves 5, 5 are provided opposite each other, and in Fig. 3 the rim 3 itself is thinner than the edge 6 at the seal. According to Fig. 4 the wall thickness may alternatively be reduced only at the long sides of a sub rstantially rectangular cone.
  • a cathode-ray tube comprising an evacuated envelope, said envelope including a metal substantiallyconical portion and a glass window sealed thereto at the larger end, the end of the metal cone slightly projecting in a direction substantially parallel to the axis of the cone beyond the area of the cone sealed to the glass window, the thickness of the end of the cone approximately aligned with the outer surface of the glass Window at the seal being smaller than the portion of the cone end at the sealing area.
  • a cathode-ray tube comprising an evacuated en velope, said envelope including a hollow substantiallyconical metal portion having a rectangular end with two longer sides and a rectangular glass window sealed to the rectangular end of the metal portion, the end of the metal portion slightly projecting in a direction substantially parallel to the axis of the metal substantially-conical portion beyond the area of the metal portion sealed to the glass window, a pair of grooves being provided at the long sides or" the rectangular end approximately aligned with the outer surface of the window at the seal to provide areas of reduced thickness thereat.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Joining Of Glass To Other Materials (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
US423123A 1953-05-04 1954-04-14 Cathode-ray tube Expired - Lifetime US2785821A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL747930X 1953-05-04

Publications (1)

Publication Number Publication Date
US2785821A true US2785821A (en) 1957-03-19

Family

ID=19822867

Family Applications (1)

Application Number Title Priority Date Filing Date
US423123A Expired - Lifetime US2785821A (en) 1953-05-04 1954-04-14 Cathode-ray tube

Country Status (5)

Country Link
US (1) US2785821A (enrdf_load_stackoverflow)
DE (1) DE936348C (enrdf_load_stackoverflow)
FR (1) FR1099815A (enrdf_load_stackoverflow)
GB (1) GB747930A (enrdf_load_stackoverflow)
NL (2) NL178077B (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
US4483452A (en) * 1981-12-07 1984-11-20 Corning Glass Works Television bulb
US4537322A (en) * 1982-12-13 1985-08-27 Tokyo Shibaura Denki Kabushiki Kaisha Glass envelope for a cathode-ray tube

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3193443A (en) * 1960-11-04 1965-07-06 Tcxas Instr Inc Semi-conductor header

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2654070A (en) * 1948-04-07 1953-09-29 Weston Electrical Instr Corp Sealed instrument
US2682963A (en) * 1949-10-08 1954-07-06 Rca Corp Metal cone for cathode-ray tubes

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2654070A (en) * 1948-04-07 1953-09-29 Weston Electrical Instr Corp Sealed instrument
US2682963A (en) * 1949-10-08 1954-07-06 Rca Corp Metal cone for cathode-ray tubes

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
US4483452A (en) * 1981-12-07 1984-11-20 Corning Glass Works Television bulb
US4537322A (en) * 1982-12-13 1985-08-27 Tokyo Shibaura Denki Kabushiki Kaisha Glass envelope for a cathode-ray tube

Also Published As

Publication number Publication date
NL83868C (enrdf_load_stackoverflow)
GB747930A (en) 1956-04-18
DE936348C (de) 1955-12-07
NL178077B (nl)
FR1099815A (fr) 1955-09-09

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