US3386785A - Method of manufacturing a gas discharge tube - Google Patents

Method of manufacturing a gas discharge tube Download PDF

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Publication number
US3386785A
US3386785A US542167A US54216766A US3386785A US 3386785 A US3386785 A US 3386785A US 542167 A US542167 A US 542167A US 54216766 A US54216766 A US 54216766A US 3386785 A US3386785 A US 3386785A
Authority
US
United States
Prior art keywords
stay
rods
electrodes
discharge tube
gas discharge
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
US542167A
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English (en)
Inventor
Frouws Simon Mari
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.)
US Philips Corp
North American Philips Co Inc
Original Assignee
US Philips 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 US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US3386785A publication Critical patent/US3386785A/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
    • H01J17/00—Gas-filled discharge tubes with solid cathode
    • H01J17/38—Cold-cathode tubes
    • H01J17/48—Cold-cathode tubes with more than one cathode or anode, e.g. sequence-discharge tube, counting tube, dekatron
    • H01J17/49—Display panels, e.g. with crossed electrodes, e.g. making use of direct current
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0069—Tubes for displaying characters

Definitions

  • a character display gaseous discharge tube in which a plurality of character-shaped electrodes are arranged in a stack, each electrode being provided with a stay-rod, a cross-section of which is only partly embedded in a member of insulating material for supporting these electrodes which facilitates assembly thereof.
  • the invention relates to a method of manufacturing a gas discharge tube, particularly of mounting the electrodes of such a tube.
  • the invention furthermore relates to a gas discharge tube particularly a character display tube manufactured by this method.
  • these electrodes are, in general, provided with supporting members formed by cars of forks by means of which the electrodes are united into an electrode assembly by stacking with the interposition of spacer rings so as to be insulated from each other.
  • This assembly must then be fixed to form a rigid unit by welding suitable members to the ends of, for example, stay rods on which the electrode supports are strung.
  • each electrode for a gas-discharge tube is provided with at least one stay rod.
  • the stay rods of the various electrodes are clamped tight in coplanar arrangement in a jig and are pressed, at a place located between the end and the electrode, into a rod of insulating material which is in a soft state.
  • This rod extends transversely of the longitudinal direction of the stay rods so that the stay rods sink down into the insulating soft material and are fixed therein after hardening of the insulating material without, however, being completely surrounded by the insulating material.
  • the insulating rod may consist of a thermo-plastic substance which can be softened by heating, for example glass, certain minerals, synthetic resin, ceramic substances or a soft, hardenable synthetic resin.
  • the stay rods project from the insulating rod and may, if necessary, be bent over to be connected with other electrodes or with current supply conductors. Moreover, it appears that the formation of leak- 3,336,785 Patented June 4, 1968 age paths by metal deposits is practically avoided, since the rods are not fused in the insulating material.
  • the insulating surface comes into contact with the surface of the stay rods at an acute angle, so that a narrow gap, which is narrower than the free path of metal atoms in the gas, is formed around the contact area betwen the insulating material and the metal. Consequently no metal atoms can be deposited therein, since they do not perform a rectilinear movement in the gas. In this method the electrodes need no longer be stacked up, nor is it necessary to pass stay rods through narrow apertures.
  • FIGS. 1 and 2 are sectional views of stay rods and an insulating rod
  • FIG. 3 is a front elevational view in section of a character display tube according to the invention.
  • FIG. 4 is a side elevation of the tube shown in FIG. 3.
  • the electrodes 11 are clamped tight with their stay rods 1 in a jig and at a place located between the stay rod end and the electrode, they are pressed in a glass rod 2 softened for example by heating.
  • the soft glass is urged aside by the rod 1, so that glass accumulations 3 and 4 are formed as is shown in FIGS. 1 and 2.
  • These glass accumulations do not surround the stay rods 1, but join the metal 1 at acute angles without wetting the metal, so that a gap is formed around the contact area of the glass 2 and the metal 1, where practically no metal atoms have access. In spite of the small distance between the stay rods 1 a constant, satisfactory insulation is thus obtained.
  • the stay rods are fixed in the glass rod and the electrode assembly can then be mounted in a tube as shown in FIGS. 3 and 4.
  • the glass tubes 2 are fixed for example by means of metal cylinders partly fused in a tube bottom 8, after which the ends of the stay rods 1 are connected directly or indirectly to the contact pins 9.
  • the ends of the rods 1 can be bent over and be connected, if desired, to a conductor 5. In certain cases some ends can be directly connected to the current supply pins 9.
  • a bulb 10 is fused to the tube bottom 8 and the tube is exhausted and, after the desired quantity of gas is introduced, it is sealed.
  • the characters 11 can be viewed from the top side of the bulb.
  • a method of manufacturing a gas-discharge tube having electrodes each of which is provided with a stayrod each having a side edge comprising the steps, clamping the stay-rods of the electrodes in coplanar arrangement in a jig, pressing the stay-rods at a place between the end thereof and the electrode with their side edges into a member of insulating material in a soft state extending transversely to the longitudinal direction of the cross-section of the stay-rods whereby the stay-rods are partly embedded into the insulating material, hardening the insulating material, inserting the member with the electrodes secured thereto by the stay-rods into an envelope, and filling the envelope with an ionizable medium.
  • thermoplastic thermoplastic

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
US542167A 1965-04-24 1966-04-12 Method of manufacturing a gas discharge tube Expired - Lifetime US3386785A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6505268A NL6505268A (enrdf_load_html_response) 1965-04-24 1965-04-24

Publications (1)

Publication Number Publication Date
US3386785A true US3386785A (en) 1968-06-04

Family

ID=19793022

Family Applications (1)

Application Number Title Priority Date Filing Date
US542167A Expired - Lifetime US3386785A (en) 1965-04-24 1966-04-12 Method of manufacturing a gas discharge tube

Country Status (5)

Country Link
US (1) US3386785A (enrdf_load_html_response)
CH (1) CH445653A (enrdf_load_html_response)
DE (1) DE1564400A1 (enrdf_load_html_response)
GB (1) GB1123098A (enrdf_load_html_response)
NL (1) NL6505268A (enrdf_load_html_response)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5487549A (en) * 1994-10-24 1996-01-30 Demag Delaval Turbomachinery Corp. Turbocare Division Turbine interfitting packing with cam adjustment

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2769939A (en) * 1950-06-12 1956-11-06 Northrop Aircraft Inc Read-out tube circuit
US2950406A (en) * 1954-05-10 1960-08-23 Philco Corp Precision cathode-ray tube assembly
US2991388A (en) * 1958-07-02 1961-07-04 Ericsson Telephone Ltd Display devices employing glow discharge tubes
GB893553A (en) * 1958-08-21 1962-04-11 Standard Telephones Cables Ltd Improvements in or relating to cold cathode display tubes
US3317981A (en) * 1963-11-18 1967-05-09 Sylvania Electric Prod Expanding hollow plastic posts on opposite sides of electrode apertures for gripping electrodes

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2769939A (en) * 1950-06-12 1956-11-06 Northrop Aircraft Inc Read-out tube circuit
US2950406A (en) * 1954-05-10 1960-08-23 Philco Corp Precision cathode-ray tube assembly
US2991388A (en) * 1958-07-02 1961-07-04 Ericsson Telephone Ltd Display devices employing glow discharge tubes
GB893553A (en) * 1958-08-21 1962-04-11 Standard Telephones Cables Ltd Improvements in or relating to cold cathode display tubes
US3317981A (en) * 1963-11-18 1967-05-09 Sylvania Electric Prod Expanding hollow plastic posts on opposite sides of electrode apertures for gripping electrodes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5487549A (en) * 1994-10-24 1996-01-30 Demag Delaval Turbomachinery Corp. Turbocare Division Turbine interfitting packing with cam adjustment

Also Published As

Publication number Publication date
CH445653A (de) 1967-10-31
NL6505268A (enrdf_load_html_response) 1966-10-25
DE1564400A1 (de) 1969-08-28
GB1123098A (en) 1968-08-14

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