GB598994A - Improvements in or relating to the manufacture of metal screens and electron discharge devices comprising such screens - Google Patents

Improvements in or relating to the manufacture of metal screens and electron discharge devices comprising such screens

Info

Publication number
GB598994A
GB598994A GB2227345A GB2227345A GB598994A GB 598994 A GB598994 A GB 598994A GB 2227345 A GB2227345 A GB 2227345A GB 2227345 A GB2227345 A GB 2227345A GB 598994 A GB598994 A GB 598994A
Authority
GB
United Kingdom
Prior art keywords
matrix
grooves
metal
sheet
mesh
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
Application number
GB2227345A
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.)
Individual
Original Assignee
Individual
Filing date
Publication date
Priority to NL81364D priority Critical patent/NL81364C/xx
Application filed by Individual filed Critical Individual
Publication of GB598994A publication Critical patent/GB598994A/en
Expired 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
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/14—Manufacture of electrodes or electrode systems of non-emitting electrodes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D47/00—Making rigid structural elements or units, e.g. honeycomb structures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J19/00—Details of vacuum tubes of the types covered by group H01J21/00
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0001—Electrodes and electrode systems suitable for discharge tubes or lamps
    • H01J2893/0012—Constructional arrangements
    • H01J2893/0019—Chemical composition and manufacture
    • H01J2893/0022—Manufacture

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Printing Plates And Materials Therefor (AREA)

Abstract

598,994. Making metal mesh screens. HOLMAN, H. E. Aug. 29, 1945, No. 22273. [Classes 83 (ii) and 83 (iv)] [Also in Group XL] Punchingand embossing dies ; perforating.- In a method of making 'a metal mesh screen, suitable for use in cathode-ray tubes used for television transmission, a matrix is provided having grooves corresponding to the pattern of the mesh and a thin sheet of metal to form the mesh is pressed against the matrix by a second matrix formed with ridges corresponding to the grooves so as to force the metal of the sheet into the grooves, the metal between the grooves being subsequently removed to form the mesh. In a modification, the second matrix is replaced by a compressible pad, the first matrix having flat areas between the grooves. A wax plate is ruled in two directions at right angles with 200 V-shaped grooves per inch, 0.003 inches deep. The plate is rendered conducting by a film of graphite and a master plate is obtained by electro-deposition in known manner. From this is produced a positive matrix 1 having grooves 3. A negative matrix 2 is formed by electro-deposition on the matrix 1, the apices of the projections 4 being removed by lapping. Matrix 1 may be of copper and matrix 2 of nickel or of copper coated with nickel or chromium. A sheet of aluminium about 0.003 inch thick is pressed between the matrices, so that metal of the sheet is forced into the grooves 3 as shown in Fig. 3. The matrix 2 is stripped off and if the portions 7 of the plate between the grooves have not been completely severed, they are removed by lapping. The matrix 1 is then removed by a chemical solvent leaving a metal mesh screen of aluminium. When the second matrix is replaced by a compressible pad, the pad may comprise watersaturated bristol board or like material. Specifications 458,675 and 533,213, [Group XL], are referred to.
GB2227345A 1945-08-29 1945-08-29 Improvements in or relating to the manufacture of metal screens and electron discharge devices comprising such screens Expired GB598994A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
NL81364D NL81364C (en) 1945-08-29

Publications (1)

Publication Number Publication Date
GB598994A true GB598994A (en) 1948-03-02

Family

ID=1736839

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2227345A Expired GB598994A (en) 1945-08-29 1945-08-29 Improvements in or relating to the manufacture of metal screens and electron discharge devices comprising such screens

Country Status (1)

Country Link
GB (1) GB598994A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USB264833I5 (en) * 1972-06-21 1975-01-28

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USB264833I5 (en) * 1972-06-21 1975-01-28
US3923566A (en) * 1972-06-21 1975-12-02 Rca Corp Method of fabricating an apertured mask for a cathode-ray tube

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