EP0374571A2 - Contact surface made of a suspension containing graphite - Google Patents

Contact surface made of a suspension containing graphite Download PDF

Info

Publication number
EP0374571A2
EP0374571A2 EP89122354A EP89122354A EP0374571A2 EP 0374571 A2 EP0374571 A2 EP 0374571A2 EP 89122354 A EP89122354 A EP 89122354A EP 89122354 A EP89122354 A EP 89122354A EP 0374571 A2 EP0374571 A2 EP 0374571A2
Authority
EP
European Patent Office
Prior art keywords
graphite
tub
contact
suspension
composée
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.)
Granted
Application number
EP89122354A
Other languages
German (de)
English (en)
Other versions
EP0374571B1 (fr
EP0374571A3 (fr
Inventor
Heinz Beckerle
Rolf Reidinger
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.)
Panasonic Holdings Corp
Original Assignee
Nokia Unterhaltungselektronik Deutschland GmbH
Nokia Deutschland GmbH
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 Nokia Unterhaltungselektronik Deutschland GmbH, Nokia Deutschland GmbH filed Critical Nokia Unterhaltungselektronik Deutschland GmbH
Publication of EP0374571A2 publication Critical patent/EP0374571A2/fr
Publication of EP0374571A3 publication Critical patent/EP0374571A3/fr
Application granted granted Critical
Publication of EP0374571B1 publication Critical patent/EP0374571B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/20—Manufacture of screens on or from which an image or pattern is formed, picked up, converted or stored; Applying coatings to the vessel
    • 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
    • H01J29/88—Vessels; Containers; Vacuum locks provided with coatings on the walls thereof; Selection of materials for the coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/88—Coatings
    • H01J2229/882—Coatings having particular electrical resistive or conductive properties

Definitions

  • the invention relates to a graphite-containing conductive suspension for a contact surface on the inner edge of a tub of a picture tube.
  • the phosphors After the phosphors have been introduced into the tub of the picture tube, they are usually covered with a layer of lacquer. Subsequently, contact lines from a graphite-containing conductive suspension are applied to the inner edge of the tub, starting from the holding pins for the shadow mask to be used later. After the contact lines have been applied, a thin aluminum layer is evaporated onto the inside of the tub in a high vacuum. In the finished state of the picture tube, the contact lines connect the aluminum layer in the tub to the shadow mask via the holding pins. This is connected via a spring to the inner conductive layer in the piston of the picture tube and thus to the high-voltage connection (FUNK-TECHNIK, 1967, No. 16, pages 576 to 580).
  • the invention has for its object to provide a guide suspension for a contact surface on the inner edge of the tub of a picture tube.
  • the lead suspension consists of graphite, iron oxide, water glass and water.
  • the solids content should be 30 to 40% by weight, preferably 35% by weight.
  • This master suspension dries quickly and washable on the glass of the inner edge, so that it can be used in an automated production line with short cycle times. It also does not change due to contact with the paint layer, so that it can even be applied before painting. When the tub is heated, this conductive suspension does not cause any bubbles in the aluminum layer and is then abrasion-resistant and very low-resistance. Resistance values of less than 500 ohms result with a test area of 10 mm by 20 mm.
  • the conductive suspension can be applied to the inner edge of the tub by printing, preferably pad printing.
  • the contact area thus generated is so good that a single area per well for the connection of the aluminum layer via, for example A spring attached to the frame of the shadow mask with the inner conductive layer in the cone is sufficient.
  • the contact area must be so large that a good, low-resistance connection with the aluminum layer is achieved and the contact ends of the spring lie securely on the contact area.
  • the contact area preferably has the dimensions 20 mm by 40 mm and its layer thickness is approximately 10 to 30 micrometers, preferably 20 micrometers. Because of this great thickness, a corresponding depth in the cliché of the printing device is required; it is approximately 100 micrometers with a layer thickness of 20 micrometers.
  • the conductive suspension is printed on the inner edge of the tub to produce the contact surface.
  • the phosphor layer and the contact surface are then dried, which can be done, for example, by using radiant heaters.
  • the lacquer film is applied and then the tub is aluminized. This is followed by the other usual manufacturing steps.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Cookers (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
EP89122354A 1988-12-20 1989-12-04 Contact surface made of a suspension containing graphite Expired - Lifetime EP0374571B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3842837 1988-12-20
DE3842837A DE3842837A1 (de) 1988-12-20 1988-12-20 Graphithaltige leitsuspension

Publications (3)

Publication Number Publication Date
EP0374571A2 true EP0374571A2 (fr) 1990-06-27
EP0374571A3 EP0374571A3 (fr) 1991-06-12
EP0374571B1 EP0374571B1 (fr) 1996-03-06

Family

ID=6369604

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89122354A Expired - Lifetime EP0374571B1 (fr) 1988-12-20 1989-12-04 Contact surface made of a suspension containing graphite

Country Status (2)

Country Link
EP (1) EP0374571B1 (fr)
DE (2) DE3842837A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0844641A1 (fr) * 1996-11-26 1998-05-27 Lg Electronics Inc. Revêtement interne pour tube à rayons cathodiques couleur
NL1002804C2 (nl) * 1995-04-04 1999-01-12 Hitachi Powdered Metals Bekledingsmateriaal voor een binnenlaag van een kathodestraalbuis.

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0782821B2 (ja) * 1990-05-21 1995-09-06 日本アチソン株式会社 陰極線管用内装コーティング剤組成物

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3791546A (en) * 1971-11-26 1974-02-12 Rca Corp Cathode-ray tube having conductive internal coating comprised of iron oxide and graphite
US4301041A (en) * 1979-10-22 1981-11-17 Zenith Radio Corporation Method and solution for conductive coating for use in cathode ray tubes
JPS58216331A (ja) * 1982-06-11 1983-12-16 Toshiba Corp 陰極線管の製造方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3791546A (en) * 1971-11-26 1974-02-12 Rca Corp Cathode-ray tube having conductive internal coating comprised of iron oxide and graphite
US4301041A (en) * 1979-10-22 1981-11-17 Zenith Radio Corporation Method and solution for conductive coating for use in cathode ray tubes
JPS58216331A (ja) * 1982-06-11 1983-12-16 Toshiba Corp 陰極線管の製造方法

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Funk-Technik, 1967, Nr. 16, Seiten 576 - 580 *
PATENT ABSTRACTS OF JAPAN, Band 8, Nr. 66 (E-234)[1503], 28. März 1984; & JP-A-58 216 331 (TOKYO-SHIBAURA) 16-12-1983 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1002804C2 (nl) * 1995-04-04 1999-01-12 Hitachi Powdered Metals Bekledingsmateriaal voor een binnenlaag van een kathodestraalbuis.
EP0844641A1 (fr) * 1996-11-26 1998-05-27 Lg Electronics Inc. Revêtement interne pour tube à rayons cathodiques couleur
CN1121461C (zh) * 1996-11-26 2003-09-17 Lg电子株式会社 彩色显象管用的内装涂料

Also Published As

Publication number Publication date
EP0374571B1 (fr) 1996-03-06
DE3842837A1 (de) 1990-06-21
DE58909618D1 (de) 1996-04-11
EP0374571A3 (fr) 1991-06-12

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