US2915039A - Formation of conducting layers - Google Patents

Formation of conducting layers Download PDF

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Publication number
US2915039A
US2915039A US621061A US62106156A US2915039A US 2915039 A US2915039 A US 2915039A US 621061 A US621061 A US 621061A US 62106156 A US62106156 A US 62106156A US 2915039 A US2915039 A US 2915039A
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US
United States
Prior art keywords
tube
window
formation
glass tube
envelope
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
US621061A
Other languages
English (en)
Inventor
Wardley John
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.)
EMI Ltd
Electrical and Musical Industries Ltd
Original Assignee
EMI Ltd
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 EMI Ltd filed Critical EMI Ltd
Application granted granted Critical
Publication of US2915039A publication Critical patent/US2915039A/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
    • H01J29/88—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
    • 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
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/14—Manufacture of electrodes or electrode systems of non-emitting electrodes
    • 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
    • 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

  • This invention relates to the formation of conducting layers by spraying.
  • Such layers are used, for example, to form transparent signal plates in electronic devices such as television pickup tubes and the material to form said layer is usually in the form of a solution which is sprayed onto a hot surface of glass, frequently forming a window sealed to the end of a tubular envelope via a metal ring as in known types of photo-conductive tubes. It is essential during the spraying operation to confine the conducting layer to a predetermined area of the window since for example the presence of a conducting layer on the tube wall may cause leakage or a short circuit between the signal plate and other electrodes.
  • the object of the present invention is to provide an improved method of confining the formation of a conducting layer to a predetermined area in the envelope of an electronic device with a view to alleviating the above mentioned difficulty.
  • a device for spray coating the inner surface of the window of a glass tube and for preventing a coating from being deposited on the glass tube during the spraying a metal ring sealed between the window and the end of the glass tube, a masking tube within the glass tube exposing the inner surface of said window, for preventing the coating material from being deposited on the glass tube during spraying, the masking tube being of less diameter than the glass tube and concentrically arranged within the glass tube and spaced therefrom to provide a gas pressure chamber, the masking tube having a diameter to in clude the inner edge of the metal ring, the inner end of the masking tube being in juxtaposition to the ring, a gas inlet duct connected with the said gas pressure chamber for supplying a gas to said pressure chamber.
  • the masking tube so used may be of metal, asbestos or any other suitable material, and the pressure of gas which causes said gas to tend to flow around the edges of the mask, may not only serve the purpose of preventing leakage of said substance around the edge of the masking tube but in addition may maintain those surfaces on which a conducting layer is not required to be formed at a temperature below that at which the layer formed is conductive.
  • the invention is particularly applicable to photo-conductive tubes and in the drawing there is shown in crosssection a portion of a tube in which a conducting layer forming the signal plate of the tube is formed by a method in accordance with the invention and onto which is afterwards deposited at photo-conductive layer.
  • the tube comprises a Window 1 and a metal ring 2 sealed between the window 1 and the end of a glass envelope 3 the latter having a side tube 4.
  • a tubular mask 6 of such diameter as to include the inner edge of the metal ring 2 is inserted into said envelope 3 with one end in contact with said ring.
  • the conducting layer required to be formed on the inner surface of the Window 1 may be formed from an aqueous solution of fused stannic chloride, for example the solution may comprise 1 part by weight of water and 10 parts by weight of stannic chloride pentahydrate with or without the addition of a small quantity of a reducing agent such as phenylhydrazine hydrochloride.
  • a layer formed by spraying such a solution is called in the art a NESA layer, and substances suitable for forming NESA layers are obtainable from the Pittsburgh Plate Glass Co.
  • the temperature of the window is raised to that required to form such a layer and a suitable solution such as the one described above is then sprayed through the tubular mask onto the window 1.
  • the mask 6 serves in general to prevent the sprayed solution from becoming deposited on to the inner wall of the envelope but in order to reduce the possibility of leakage of the sprayed solution past the end of the mask where it makes contact with the metal ring 2 a stream of air is introduced into the envelope 3 through the side tube 4 so as to cause the pressure of the air between said envelope 3 and mask 6 to be such that there is a tendency for the air to flow in the direction indicated by the arrows 7 between the outer surface of the mask 6 and the inner surface of the envelope 3 so opposing said leakage.
  • the velocity of the stream of air need not be great, and a few cubic centimeters per second has been found to be effective in preventing a conducting layer from being formed on the glass envelope.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Apparatuses And Processes For Manufacturing Resistors (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Non-Adjustable Resistors (AREA)
  • Surface Treatment Of Glass (AREA)
US621061A 1955-11-12 1956-11-08 Formation of conducting layers Expired - Lifetime US2915039A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB32396/55A GB845985A (en) 1955-11-12 1955-11-12 Improvements in or relating to the formation of electrically conducting layers

Publications (1)

Publication Number Publication Date
US2915039A true US2915039A (en) 1959-12-01

Family

ID=10337972

Family Applications (1)

Application Number Title Priority Date Filing Date
US621061A Expired - Lifetime US2915039A (en) 1955-11-12 1956-11-08 Formation of conducting layers

Country Status (4)

Country Link
US (1) US2915039A (fr)
FR (1) FR1160235A (fr)
GB (1) GB845985A (fr)
NL (2) NL211978A (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3280794A (en) * 1960-04-15 1966-10-25 Int Latex Corp Coating apparatus including masking means
US3349480A (en) * 1962-11-09 1967-10-31 Ibm Method of forming through hole conductor lines
US3809011A (en) * 1969-05-23 1974-05-07 Tunzini Ameliorair Sa Apparatus for the surface coating of objects
US3874333A (en) * 1972-09-28 1975-04-01 Nat Steel Corp Preventing edge wrap-around in one-side electrostatic coating

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3294576A (en) * 1963-01-14 1966-12-27 First Safe Deposit Nat Bank Of Method of producing printed circuit structures
GB2215426A (en) * 1988-03-03 1989-09-20 Bowthorpe Hellermann Ltd Masking tubular components
US8460760B2 (en) 2010-11-30 2013-06-11 United Technologies Corporation Coating a perforated surface

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1956637A (en) * 1931-01-28 1934-05-01 Hygrade Sylvania Corp Spraying apparatus
US2123706A (en) * 1932-07-20 1938-07-12 Hygrade Sylvania Corp Method of manufacture of reflector bulbs
US2242032A (en) * 1937-10-30 1941-05-13 Chrysler Corp Mask
US2559969A (en) * 1950-02-16 1951-07-10 Pittsburgh Plate Glass Co Method of applying a masking composition to a glass base

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1956637A (en) * 1931-01-28 1934-05-01 Hygrade Sylvania Corp Spraying apparatus
US2123706A (en) * 1932-07-20 1938-07-12 Hygrade Sylvania Corp Method of manufacture of reflector bulbs
US2242032A (en) * 1937-10-30 1941-05-13 Chrysler Corp Mask
US2559969A (en) * 1950-02-16 1951-07-10 Pittsburgh Plate Glass Co Method of applying a masking composition to a glass base

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3280794A (en) * 1960-04-15 1966-10-25 Int Latex Corp Coating apparatus including masking means
US3349480A (en) * 1962-11-09 1967-10-31 Ibm Method of forming through hole conductor lines
US3809011A (en) * 1969-05-23 1974-05-07 Tunzini Ameliorair Sa Apparatus for the surface coating of objects
US3874333A (en) * 1972-09-28 1975-04-01 Nat Steel Corp Preventing edge wrap-around in one-side electrostatic coating

Also Published As

Publication number Publication date
FR1160235A (fr) 1958-07-09
GB845985A (en) 1960-08-24
NL100960C (fr)
NL211978A (fr)

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