US2909200A - Grid electrodes for electron discharge devices - Google Patents

Grid electrodes for electron discharge devices Download PDF

Info

Publication number
US2909200A
US2909200A US498538A US49853855A US2909200A US 2909200 A US2909200 A US 2909200A US 498538 A US498538 A US 498538A US 49853855 A US49853855 A US 49853855A US 2909200 A US2909200 A US 2909200A
Authority
US
United States
Prior art keywords
grid
wires
mandrel
members
discharge devices
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
US498538A
Inventor
Carl F Miller
Ernest F Smart
Gene R Feaster
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.)
Westinghouse Electric Corp
Original Assignee
Westinghouse Electric 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 Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Priority to US498538A priority Critical patent/US2909200A/en
Application granted granted Critical
Publication of US2909200A publication Critical patent/US2909200A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • H01J2893/0025—Manufacture by winding wire upon a support

Definitions

  • the present invention involves placing a :number of grid frame members on a support member, winding wire material around the support member at .:any desired pitch, joining the wire material to the grid I'frame members at the intersections of the wire material and the grid frame members, and separating the com- ,pleted grids from each other by cutting the wire material between adjacent grid frame members.
  • Figure l is a partial end view of the apparatus upon which the grid frame members are mounted during manufacture of the grid electrodes;
  • Fig. 2 is a top view of the apparatus of Fig. 1;
  • Fig. 3 is a view in elevation, partly in section, of a suitable method of joining grid wires to grid frame members
  • Fig. 4 is a perspective View of the apparatus used to separate the completed grid electrodes from each other;
  • Fig. 5 is a cross sectional view of a part of Fig. 4 "showing the cutting of the wires between the grid frame :members;
  • Fig. 6 is an exploded perspective view of another form of the apparatus upon which the grid frame members are mounted during manufacture of the grid electrodes.
  • a shaft member 11 which may be rotatable, if desired, around which a mandrel member 13 is positioned.
  • a key member 15 is used in positioning the mandrel member 13 on the shaft member 11.
  • Grid frame members 17 are attached to the mandrel member 13. Suitable methods of attaching the grid frames 17 to the mandrel member 13 include providing the shaft member 11 and the mandrel member 13 with Iainternal channels by which the grid frames 17 may be held by.vacuum to the mandrel member 13. Another method is to utilize magnetic attraction to attachthe grid frames 17 to the mandrel member 13. Also the edges of the grid frames 17 can be held to the mandrel member 13 by a clip. Another suitable method is shown by Fig. 2. Wirematerial 19 is wound around the mandrel member 13 in such a manner as to cross the grid frames 17 a number of times. The spacing and the pitch.
  • the mandrel member 13 may be removed from the shaft member 11 and may with a source of compressed gas to eject a spray of molten metal.
  • the metal spray gun 25 is supplied with a rod 27 of a suitable metal to be used in joining the grid wires 23 to the grid frame 17. In operation, the metal spray gun 25 creates a flame of intense heat in which the rod 27 is fused and is immediately subjected to a blast of air or gas whereby the molten metal is projected as a spray 29 of fused metal.
  • the gas may be such as to prevent oxidation of the metal spray.
  • a metal coating 31 is formed over the intersections of the lateral gridwires 23 and the grid frame members 17 so that thelateral grid wires 23 are bonded to the grid frame member 17. Since it is possible to spray a large variety of metals by the Schoop process, a wide choice of metals are available for use in joining the grid wire 23 to the grid frame members 17. Molybdenum has been found to be a suitable metal for use ,in the Schoop process, as have the brazing solder powders discussed below. Suitable masking to avoid metal deposition in undesirable locations may be used. Other methods which may be used to join the lateral grid wires 23 to the grid frame member 17 include cold welding, welding, notching and peening, and brazing.
  • FIG. 4 there is shown the shaft member 11, the mandrel member 13, the key member 15, the grid frame member. 17 and the lateral cross wires 23.
  • Cutting members 33 are mountedon a cutting member supportmember 35 between rubber. pads 37.. .
  • the cutting member support member 35 is' gearedtothe shaft member 11 so that as the shaft member 11 is rotated, the cutting member support member 35 is rotated in such a manner as to position a cutting member 33 between each grid frame member 17 so that the wire material between the grid frames 17 is severed, thus separating the completed grid electrodes 39 from each other.
  • a suitable grid electrode is shown in Fig. 4 including a grid frame member 17 having a U-shaped cross section, a flat middle portion 41 and at least one aperture 20 in the flat middle portion 41.
  • Lateral grid wires 23 are positioned across the aperture 20 and joined to the grid frame member 17 by any of the methods discussed elsewhere in this application.
  • the grid electrode 39 has tapered leg members 45 at the end portions. It is apparent, however, that the present invention is not necessarily limited to grid electrodes of the above configurations.
  • the edge portions 49 of the grid frame member 17 may be positioned at any desired anglewith respect to the flat middle portion 41 of the grid frame member 17 including perpendicular and coplanar configurations.
  • Fig. 5 there is shown the actual cutting operation in which the cutting member 33 is severing the wires 23 Patented Oct. 20, 1,959
  • FIG. 1 may bemounted.
  • 'I 'he grid frame rnembers areheld in position by collar members 55 and 57.
  • the mandrel member 53 with the grid frame members.
  • mandrel member 53 with the collar members 55 and 57 still attached may be removed from the shaft member 5-1 and brazed if desired.
  • collar members 55 and 57 are removed from themandrel member 53 before the grids are separated as is shown in Fig. 4.
  • the mandrel members may have a smooth surface as shown by mandrel member- 53 or a notched surface as shown by mandrel member 13 in Fig. 1.
  • Grid frame members 17 and the lateral grid wires 23 Materials used for the grid frame members 17 and the lateral grid wires 23 must be chosen carefully. It is very important that the coeflicients of thermal expansion of the grid frame members 17, the lateral grid wires 23, and any brazing materials-used in joining the lateral grid wires 23 to the grid frame members 17, be closely matched.
  • a first combination of suitable materials would include grid frames 17 made of .015 inch sheet Kovar with lateral wires made of gold plated molybdenum of .002 inch diameter.
  • a suitable solder powder is composed of 15%,silver, 80% copper and 5% phosphorous, and is heated at 700 C. for three minutes.
  • a second combination of suitable materials would include grid frames 17 made of .010 inch sheet steel of the type known in the trade under the designation SAE 1010 and lateral wires made of .002 inch diameter stainless steel.
  • the preferred solder powder may be either one composed of 15% silver, 80% copper and 5% phosphorous which is heated at 7 00 C. for three minutes or a powder composed of 60% silver, 30% copper and tin, which is heated at 750 C. for three minutes.
  • methanol binders are suitable.
  • Another suitable binder is polymerized methyl methacrylate, known under the trade name Lucite.
  • This invention utilized a method suited for fully automatic grid manufacture procedures with -a reduction of labor costs, improved efiiciency and better control of tolerances.
  • These grid electrodes may be made with from 100 to 400 lateral wires 23 per inch.
  • the number of grid frame members 17 mounted on the mandrel member 4 13 or 53 may vary in number but groups of 2, 10 and 20 grid electrodes have been made at one time by this method.
  • the wire 19 must be attached to the first grid by known methods such as spot welding or by the use of pins.
  • the mandrel member 13 or 53 may be of any desired shape or configuration but a cylindrical mandrel member is preferred. Because, using this shape, the circular winding speed is uniform which results in more uniform tension of the lateral grid wires 23. After completing the winding, the wire 19 is fastened to the last grid'frame member 17 in the same manner as it was first attached. Also, more than one mandrel member 13 may be supported on the same shaft member 11 allowing more grids to be manufactured in one operation.
  • a method of fabricating a plurality of frame grid members characterizing and having a planar support member with an aperture therein and lateral wires overlying and extending beyond said aperture said method including the steps of providing a mandrel member, providing a plurality of positioning means on the surface of said mandrel for individually positioning a plurality of support members therein, securing said support members to the surface of said mandrel by magnetic attraction, winding wire material at equally spaced intervals across the apertures in said frames thereby providing a suitable number of lateral wires for each of said support members, spraying a molten metal onto said lateral wires and said support member to bond said lateral wires to said support member and separating the completed grid electrodes from each other and the mandrel to provide a plurality of individual frame grid electrode members.

Landscapes

  • Cell Electrode Carriers And Collectors (AREA)

Description

Oct. 20, 1959 c F. MILLER .ET AL GRID ELECTRODES FOR ELECTRON DISCHARGE DEVICES 2 Sheets-Sheet 1 Filed April 1, 1955 15 lam- X INVENTORS Ernest F. Smart WITNESSES Carl F. Mill er, and Gene R. Feoster.
f ATTORNEY Maya;
Oct. 20, 1959 c. F. MILLER ETAL 2,999,200
' GRID ELECTRODES FOR' ELECTRON DISCHARGE DEVICES Filed April 1, 1955 2 Sheets-Sheet 2 Fig.6.
v eni (a United States Patent C M GRID ELECTRODES FOR ELECTRON DISCHARGE DEVICES Carl F. Miller, Bath, and Ernest F. Smart and Gene R. Feaster, Horseheads, N.Y., assignors to Westinghouse Electric Corporation, East Pittsburgh, Pa., a corporation of Pennsylvania Application April 1, 1955, Serial No. 498,538 '1 Claim. (Cl. 140-715 This invention relates to electron discharge devices and more particularly to improvements in or relating to the construction of grid electrodes for use in said electron discharge devices.
In general, the present invention involves placing a :number of grid frame members on a support member, winding wire material around the support member at .:any desired pitch, joining the wire material to the grid I'frame members at the intersections of the wire material and the grid frame members, and separating the com- ,pleted grids from each other by cutting the wire material between adjacent grid frame members.
It is an object of this invention to provide a method of manufacturing grid electrodes for electron discharge devices.
It is another object to provide a method for manufac turing grid electrodes for electron discharge devices, which method is suitable for use in the automatic production of electronic parts.
It is an additional object to provide an improved grid electrode sturdy enough to be used in automatic production methods of manufacture.
It is a different object to provide a method of manufaeturing grid electrodes for electron discharge devices, which method results in a lower percentage of rejected grids and, therefore, in higher efficiency in the manufacture of grid electrodes.
It is still another object to provide an improved method of attaching lateral grid wires to grid frames.
These and other objects of the invention will be apparent from the following description taken in accordance with the accompanying drawings which form a part of this application, and in which:
Figure l is a partial end view of the apparatus upon which the grid frame members are mounted during manufacture of the grid electrodes;
Fig. 2 is a top view of the apparatus of Fig. 1;
Fig. 3 is a view in elevation, partly in section, of a suitable method of joining grid wires to grid frame members;
Fig. 4 is a perspective View of the apparatus used to separate the completed grid electrodes from each other;
Fig. 5 is a cross sectional view of a part of Fig. 4 "showing the cutting of the wires between the grid frame :members; and
Fig. 6 is an exploded perspective view of another form of the apparatus upon which the grid frame members are mounted during manufacture of the grid electrodes.
In Fig. 1 there is shown a shaft member 11, which may be rotatable, if desired, around which a mandrel member 13 is positioned. A key member 15 is used in positioning the mandrel member 13 on the shaft member 11. Grid frame members 17 are attached to the mandrel member 13. Suitable methods of attaching the grid frames 17 to the mandrel member 13 include providing the shaft member 11 and the mandrel member 13 with Iainternal channels by which the grid frames 17 may be held by.vacuum to the mandrel member 13. Another method is to utilize magnetic attraction to attachthe grid frames 17 to the mandrel member 13. Also the edges of the grid frames 17 can be held to the mandrel member 13 by a clip. Another suitable method is shown by Fig. 2. Wirematerial 19 is wound around the mandrel member 13 in such a manner as to cross the grid frames 17 a number of times. The spacing and the pitch.
of the wire 19 are guided by a guide member 21. After the winding operation, if desired, the mandrel member 13 may be removed from the shaft member 11 and may with a source of compressed gas to eject a spray of molten metal. The metal spray gun 25 is supplied with a rod 27 of a suitable metal to be used in joining the grid wires 23 to the grid frame 17. In operation, the metal spray gun 25 creates a flame of intense heat in which the rod 27 is fused and is immediately subjected to a blast of air or gas whereby the molten metal is projected as a spray 29 of fused metal.. The gas may be such as to prevent oxidation of the metal spray. In this way, a metal coating 31 is formed over the intersections of the lateral gridwires 23 and the grid frame members 17 so that thelateral grid wires 23 are bonded to the grid frame member 17. Since it is possible to spray a large variety of metals by the Schoop process, a wide choice of metals are available for use in joining the grid wire 23 to the grid frame members 17. Molybdenum has been found to be a suitable metal for use ,in the Schoop process, as have the brazing solder powders discussed below. Suitable masking to avoid metal deposition in undesirable locations may be used. Other methods which may be used to join the lateral grid wires 23 to the grid frame member 17 include cold welding, welding, notching and peening, and brazing.
In Fig. 4 there is shown the shaft member 11, the mandrel member 13, the key member 15, the grid frame member. 17 and the lateral cross wires 23. Cutting members 33 are mountedon a cutting member supportmember 35 between rubber. pads 37.. .The cutting member support member 35is' gearedtothe shaft member 11 so that as the shaft member 11 is rotated, the cutting member support member 35 is rotated in such a manner as to position a cutting member 33 between each grid frame member 17 so that the wire material between the grid frames 17 is severed, thus separating the completed grid electrodes 39 from each other.
A suitable grid electrode is shown in Fig. 4 including a grid frame member 17 having a U-shaped cross section, a flat middle portion 41 and at least one aperture 20 in the flat middle portion 41. Lateral grid wires 23 are positioned across the aperture 20 and joined to the grid frame member 17 by any of the methods discussed elsewhere in this application. The grid electrode 39 has tapered leg members 45 at the end portions. It is apparent, however, that the present invention is not necessarily limited to grid electrodes of the above configurations. The edge portions 49 of the grid frame member 17 may be positioned at any desired anglewith respect to the flat middle portion 41 of the grid frame member 17 including perpendicular and coplanar configurations.
In Fig. 5 there is shown the actual cutting operation in which the cutting member 33 is severing the wires 23 Patented Oct. 20, 1,959
whichgrid frames similar to the grid frame member 1.7.2
showninFig. 1 may bemounted. 'I 'he grid frame rnembers areheld in position by collar members 55 and 57. The mandrel member 53 with the grid frame members.
and collar membersSS and 57' attached is thenfitted to; the shaft member 51 and locked into position by screwing end member 59 into the shaft member 51. After the winding operation the mandrel member 53 with the collar members 55 and 57 still attached may be removed from the shaft member 5-1 and brazed if desired. After the brazing operation, collar members 55 and 57 are removed from themandrel member 53 before the grids are separated as is shown in Fig. 4. The mandrel members may have a smooth surface as shown by mandrel member- 53 or a notched surface as shown by mandrel member 13 in Fig. 1.
Materials used for the grid frame members 17 and the lateral grid wires 23 must be chosen carefully. It is very important that the coeflicients of thermal expansion of the grid frame members 17, the lateral grid wires 23, and any brazing materials-used in joining the lateral grid wires 23 to the grid frame members 17, be closely matched. A first combination of suitable materials would include grid frames 17 made of .015 inch sheet Kovar with lateral wires made of gold plated molybdenum of .002 inch diameter. In addition, if brazing is the method used to join the lateral wires 23 to the grid frame members 17, a suitable solder powder is composed of 15%,silver, 80% copper and 5% phosphorous, and is heated at 700 C. for three minutes. A second combination of suitable materials would include grid frames 17 made of .010 inch sheet steel of the type known in the trade under the designation SAE 1010 and lateral wires made of .002 inch diameter stainless steel. Again, if brazing is used as the method for joining the lateral wires 23-to the grid frames 17, the preferred solder powder may be either one composed of 15% silver, 80% copper and 5% phosphorous which is heated at 7 00 C. for three minutes or a powder composed of 60% silver, 30% copper and tin, which is heated at 750 C. for three minutes. In the brazing process methanol binders are suitable. Another suitable binder is polymerized methyl methacrylate, known under the trade name Lucite.
This invention utilized a method suited for fully automatic grid manufacture procedures with -a reduction of labor costs, improved efiiciency and better control of tolerances. These grid electrodes may be made with from 100 to 400 lateral wires 23 per inch. The number of grid frame members 17 mounted on the mandrel member 4 13 or 53 may vary in number but groups of 2, 10 and 20 grid electrodes have been made at one time by this method. The wire 19 must be attached to the first grid by known methods such as spot welding or by the use of pins.
The mandrel member 13 or 53 may be of any desired shape or configuration but a cylindrical mandrel member is preferred. because, using this shape, the circular winding speed is uniform which results in more uniform tension of the lateral grid wires 23. After completing the winding, the wire 19 is fastened to the last grid'frame member 17 in the same manner as it was first attached. Also, more than one mandrel member 13 may be supported on the same shaft member 11 allowing more grids to be manufactured in one operation.
While the present invention has been shown in a few preferred forms only, it will be obvious to those skilled in the art that it is not so limited but is susceptible of various changes and, modifications without departingfrom the spirit thereof.
We claim as our invention:
A method of fabricating a plurality of frame grid members characterizing and having a planar support member with an aperture therein and lateral wires overlying and extending beyond said aperture, said method including the steps of providing a mandrel member, providing a plurality of positioning means on the surface of said mandrel for individually positioning a plurality of support members therein, securing said support members to the surface of said mandrel by magnetic attraction, winding wire material at equally spaced intervals across the apertures in said frames thereby providing a suitable number of lateral wires for each of said support members, spraying a molten metal onto said lateral wires and said support member to bond said lateral wires to said support member and separating the completed grid electrodes from each other and the mandrel to provide a plurality of individual frame grid electrode members.
References Cited in the file of this patent UNITED STATES PATENTS Bongers Dec. 13, 19
US498538A 1955-04-01 1955-04-01 Grid electrodes for electron discharge devices Expired - Lifetime US2909200A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US498538A US2909200A (en) 1955-04-01 1955-04-01 Grid electrodes for electron discharge devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US498538A US2909200A (en) 1955-04-01 1955-04-01 Grid electrodes for electron discharge devices

Publications (1)

Publication Number Publication Date
US2909200A true US2909200A (en) 1959-10-20

Family

ID=23981484

Family Applications (1)

Application Number Title Priority Date Filing Date
US498538A Expired - Lifetime US2909200A (en) 1955-04-01 1955-04-01 Grid electrodes for electron discharge devices

Country Status (1)

Country Link
US (1) US2909200A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2998033A (en) * 1957-02-12 1961-08-29 Sylvania Electric Prod Apparatus for producing cathode ray tubes
DE1134767B (en) * 1960-06-29 1962-08-16 Telefunken Patent Device for the production of frame grids wound on one side for electrical discharge tubes
US3094150A (en) * 1958-07-29 1963-06-18 Cie Ind Francaise Tubes Elect Manufacture of grids for electronic tubes
US3130757A (en) * 1960-08-12 1964-04-28 Rca Corp Method of fabricating grid electrodes
US3159188A (en) * 1962-03-01 1964-12-01 Motorola Inc Method of supplying wire for mounting in electronic units
US3200854A (en) * 1960-02-17 1965-08-17 Philips Corp Method of manufacturing grids for use in electronic discharge valves

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1666071A (en) * 1926-05-22 1928-04-17 Perryman Electric Company Inc Grid for vacuum tubes
US1669145A (en) * 1925-01-08 1928-05-08 Gen Electric Control electrode for space-current devices
US2004246A (en) * 1934-12-06 1935-06-11 Soverign Machinery Company Method of producing radio tube grids
US2005897A (en) * 1933-09-27 1935-06-25 Westinghouse Electric & Mfg Co Electrode for a vapor electric device and method of constructing the same
US2037231A (en) * 1933-09-06 1936-04-14 Heintz & Kaufman Ltd Shielded electrode tube
US2064169A (en) * 1936-01-03 1936-12-15 Sovereing Machinery Company Method of and apparatus for producing radio tube grids
US2391969A (en) * 1944-03-07 1946-01-01 Herzog Carl Apparatus for producing cage grids
US2426522A (en) * 1944-01-17 1947-08-26 Heathway Engineering Company L Apparatus for winding helixes
US2567415A (en) * 1948-09-30 1951-09-11 Bell Telephone Labor Inc Grid assembly and method of fabrication
US2610387A (en) * 1945-03-22 1952-09-16 Eileen E Borland Method of making grid assemblies
US2661029A (en) * 1948-10-20 1953-12-01 Bell Telephone Labor Inc Method of making a fine wire mesh
US2726686A (en) * 1950-06-15 1955-12-13 Hartford Nat Bank & Trust Co Jig for winding grid wires

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1669145A (en) * 1925-01-08 1928-05-08 Gen Electric Control electrode for space-current devices
US1666071A (en) * 1926-05-22 1928-04-17 Perryman Electric Company Inc Grid for vacuum tubes
US2037231A (en) * 1933-09-06 1936-04-14 Heintz & Kaufman Ltd Shielded electrode tube
US2005897A (en) * 1933-09-27 1935-06-25 Westinghouse Electric & Mfg Co Electrode for a vapor electric device and method of constructing the same
US2004246A (en) * 1934-12-06 1935-06-11 Soverign Machinery Company Method of producing radio tube grids
US2064169A (en) * 1936-01-03 1936-12-15 Sovereing Machinery Company Method of and apparatus for producing radio tube grids
US2426522A (en) * 1944-01-17 1947-08-26 Heathway Engineering Company L Apparatus for winding helixes
US2391969A (en) * 1944-03-07 1946-01-01 Herzog Carl Apparatus for producing cage grids
US2610387A (en) * 1945-03-22 1952-09-16 Eileen E Borland Method of making grid assemblies
US2567415A (en) * 1948-09-30 1951-09-11 Bell Telephone Labor Inc Grid assembly and method of fabrication
US2661029A (en) * 1948-10-20 1953-12-01 Bell Telephone Labor Inc Method of making a fine wire mesh
US2726686A (en) * 1950-06-15 1955-12-13 Hartford Nat Bank & Trust Co Jig for winding grid wires

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2998033A (en) * 1957-02-12 1961-08-29 Sylvania Electric Prod Apparatus for producing cathode ray tubes
US3094150A (en) * 1958-07-29 1963-06-18 Cie Ind Francaise Tubes Elect Manufacture of grids for electronic tubes
US3200854A (en) * 1960-02-17 1965-08-17 Philips Corp Method of manufacturing grids for use in electronic discharge valves
DE1134767B (en) * 1960-06-29 1962-08-16 Telefunken Patent Device for the production of frame grids wound on one side for electrical discharge tubes
US3130757A (en) * 1960-08-12 1964-04-28 Rca Corp Method of fabricating grid electrodes
US3159188A (en) * 1962-03-01 1964-12-01 Motorola Inc Method of supplying wire for mounting in electronic units

Similar Documents

Publication Publication Date Title
US2909200A (en) Grid electrodes for electron discharge devices
US2451360A (en) Method of making grids
US2721952A (en) Grid structure and the process of making
US3130757A (en) Method of fabricating grid electrodes
US2661029A (en) Method of making a fine wire mesh
JPS62287560A (en) Manufacture photoelectric multiplier
JPS6141097B2 (en)
US2550592A (en) Focusing coil for cathode-ray tubes
US2845691A (en) Manufacture of grids for electron discharge devices
US2680824A (en) Electric discharge device
US3188720A (en) Method of sealing and joining and articles made thereby
US2810186A (en) Method of producing planar grids for vacuum tubes
US2463635A (en) Electron discharge device and method of making the same
US2738438A (en) Grid structure and method of making same
DE2135439A1 (en) Device with a hnienformigem electron beam
US2415360A (en) Method of making electron discharge devices
US2897395A (en) Grid electrodes for electric discharge devices
US2724216A (en) Method of fabricating electrode spacers
US3465400A (en) Method of making cylindrical mesh electrode for electron tubes
US3172002A (en) Cathode mount and method of fabrication
US2869015A (en) Method of fabricating a grid electrode
US3158513A (en) Method of manufacturing disc-shaped anodes for rotary-anode X-ray tubes
US3080641A (en) Method of manufacturing magnetic deflection yokes
US3315330A (en) Electron tubes
US3208137A (en) Method of fabricating electron tubes