US2829298A - Grid for use in electric discharge tubes - Google Patents

Grid for use in electric discharge tubes Download PDF

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Publication number
US2829298A
US2829298A US494690A US49469055A US2829298A US 2829298 A US2829298 A US 2829298A US 494690 A US494690 A US 494690A US 49469055 A US49469055 A US 49469055A US 2829298 A US2829298 A US 2829298A
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United States
Prior art keywords
grid
wires
electric discharge
discharge tubes
winding
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Expired - Lifetime
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US494690A
Inventor
Gude Helmut Franz Alois Te
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US Philips Corp
North American Philips Co Inc
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US Philips Corp
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    • 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 invention obviates the described disadvantage to a sufficient extent for practical purposes by the use of simple measures which aim at damping any natural vibrations of the grid or of the grid-wires.
  • the grid wire consists of at least two closely adjacent winding wires.
  • the winding wires may have equal or different diameters and may consist of the same or of dilferent materials.
  • FIG. 1 to show for the sake of simplicity only parts of a grid in accordance with the invention, since even from this simplified representation the substance of the invention and its embodiments will follow.
  • FIG. 1 reference numerals 3 and 4 designate the grid supports.
  • the winding wire consists of two closely adjacent wires 1 and 2. As may be seen from the figure the wires 1 and 2 have equal diameters. However, frequently it will be of advantage to arrange the diameters of the wires 1 and 2 to be diiferent, as may be seen from Fig. 3.
  • the wires may alternatively be arranged one on top of the other, as is shown in Figs. 4 and 5.
  • the individual winding wires may be made of different materials, that is to say different metals or metal alloys which are suitable from the point of view of the vacuum and with re gard to strength. Suitable metals are, for example, nickel and molybdenum.
  • Fig. 2 shows the way in which the winding wires 1 and 2 may be arranged in notches 5, which usually are formed in the coil winding head of the grid coiling machine and preferably are subsequently closed again by pinching.
  • the grid wire may obviously also be secured to the supports by welding.
  • grids in accordance with the invention damp any natural vibrations of grid-shaped electrodes of the usual construction to a sufiicient extent.
  • the invention can be used to particular advantage in screen grids the natural frequency of which lies within the audible range.
  • a self-damping grid structure for electron discharge devices comprising a support rod and a pair of helically arranged grid wires supported at a point in each turn by said rod with vibratory portions of said wires between said points of contact, said wires being parallel to each other and contiguous with each other substantially throughout their length, the frequency of mechanical resonance of said vibratory portions of one of said wires being different from the frequency of me chanical resonance of contiguous portions of the other of said wires whereby incipient mechanical vibration of said vibratory portions of said grid wires is damped out by mutual mechanical interference therebetween.

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  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Description

April 1, 1958 H. F. A. TE GUDE GRID FOR USE IN ELECTRIC DISCHARGE TUBES Filed March 16, 1955 1 INVENTOR Heimut E'qnz' Am's T7: G de AGENT United States Patent GRID FOR USE IN ELECTRIC DISCHARGE TUBES Helmut Franz Alois te Gude, Hamburg-Lockstedt, Gen
many, assignor, by mesne assignments, to North American Philips Company, Inc., New York, N. Y., a corporation of Delaware Application March 16, 1955, Serial No. 494,690
Claims priority, application Germany April 14, 1954 2 Claims. (Cl. 313350) It is known that changes in the geometry of electric discharge tubes may act upon the electric values such as current, capacitances, amplification and so on due to microphonic phenomena. Slight variations in the position of the control grid or its windings may, for example, adversely affect the anode current. The grid-shaped electrodes of the usual construction in which the helical grid is supported from two supports, tend to natural vibrations the frequency of which depends upon the geometry of the half grid winding and on the properties of the material.
The invention obviates the described disadvantage to a sufficient extent for practical purposes by the use of simple measures which aim at damping any natural vibrations of the grid or of the grid-wires.
According to the invention for this purpose in a grid for use in electric discharge tubes the grid wire consists of at least two closely adjacent winding wires.
The winding wires may have equal or different diameters and may consist of the same or of dilferent materials.
The invention will now be described more fully with reference to the accompanying drawing in which some embodiments thereof are shown by way of example.
Figs. 1 to show for the sake of simplicity only parts of a grid in accordance with the invention, since even from this simplified representation the substance of the invention and its embodiments will follow.
In Fig. 1 reference numerals 3 and 4 designate the grid supports. The winding wire consists of two closely adjacent wires 1 and 2. As may be seen from the figure the wires 1 and 2 have equal diameters. However, frequently it will be of advantage to arrange the diameters of the wires 1 and 2 to be diiferent, as may be seen from Fig. 3. The wires may alternatively be arranged one on top of the other, as is shown in Figs. 4 and 5. Fig. 3
2,829,298 Patented Apr. 1, 1958.
shows the wires 1 and 2 when mounted and Fig. 5 shows a junction between the support 3 and the grid wires 1 and 2 after flattening. As an alternative, the individual winding wires may be made of different materials, that is to say different metals or metal alloys which are suitable from the point of view of the vacuum and with re gard to strength. Suitable metals are, for example, nickel and molybdenum.
Fig. 2 shows the way in which the winding wires 1 and 2 may be arranged in notches 5, which usually are formed in the coil winding head of the grid coiling machine and preferably are subsequently closed again by pinching.
As will beseen from Fig. 3, if winding wires of different diameters are used it is preferable for the wires to be arranged in the notches 5 of the grid supports 3 in a manner such that the larger diameter wire is situated on the outside.
In all these cases the grid wire may obviously also be secured to the supports by welding.
It has been found that grids in accordance with the invention damp any natural vibrations of grid-shaped electrodes of the usual construction to a sufiicient extent. The invention can be used to particular advantage in screen grids the natural frequency of which lies within the audible range.
What is claimed is:
1. A self-damping grid structure for electron discharge devices, said grid structure comprising a support rod and a pair of helically arranged grid wires supported at a point in each turn by said rod with vibratory portions of said wires between said points of contact, said wires being parallel to each other and contiguous with each other substantially throughout their length, the frequency of mechanical resonance of said vibratory portions of one of said wires being different from the frequency of me chanical resonance of contiguous portions of the other of said wires whereby incipient mechanical vibration of said vibratory portions of said grid wires is damped out by mutual mechanical interference therebetween.
2. The self-damping grid structure of claim 1 in which one of said wires has a larger cross sectional arrangement than the other of said wires.
References Cited in the file of this patent UNITED STATES PATENTS 1,616,214 Brown Feb. 1, 1927 1,989,954 Van Gessel Feb. 5, 1935 2,501,002 Parker Mar. 21, 1950
US494690A 1954-04-14 1955-03-16 Grid for use in electric discharge tubes Expired - Lifetime US2829298A (en)

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DE2829298X 1954-04-14

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2936391A (en) * 1957-07-29 1960-05-10 Sylvania Electric Prod Frame grid
US2936392A (en) * 1958-03-26 1960-05-10 Sylvania Electric Prod Frame grid
US3045713A (en) * 1957-04-18 1962-07-24 Philips Corp Method of making grids for electron discharge tubes and a grid made by said method
US3114071A (en) * 1960-03-21 1963-12-10 Westinghouse Electric Corp Electron discharge device having improved electrode support
US3158777A (en) * 1959-06-16 1964-11-24 Philips Corp Grid for electron tubes

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1616214A (en) * 1922-05-05 1927-02-01 John L Brown Vacuum tube
US1989954A (en) * 1930-11-21 1935-02-05 Rca Corp Electric discharge tube
US2501002A (en) * 1946-10-26 1950-03-21 Sylvania Electric Prod Control grid

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1616214A (en) * 1922-05-05 1927-02-01 John L Brown Vacuum tube
US1989954A (en) * 1930-11-21 1935-02-05 Rca Corp Electric discharge tube
US2501002A (en) * 1946-10-26 1950-03-21 Sylvania Electric Prod Control grid

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3045713A (en) * 1957-04-18 1962-07-24 Philips Corp Method of making grids for electron discharge tubes and a grid made by said method
US2936391A (en) * 1957-07-29 1960-05-10 Sylvania Electric Prod Frame grid
US2936392A (en) * 1958-03-26 1960-05-10 Sylvania Electric Prod Frame grid
US3158777A (en) * 1959-06-16 1964-11-24 Philips Corp Grid for electron tubes
US3114071A (en) * 1960-03-21 1963-12-10 Westinghouse Electric Corp Electron discharge device having improved electrode support

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