US3928782A - Method of manufacturing an electric discharge tube and discharge tube obtained in this manner - Google Patents

Method of manufacturing an electric discharge tube and discharge tube obtained in this manner Download PDF

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Publication number
US3928782A
US3928782A US388255A US38825573A US3928782A US 3928782 A US3928782 A US 3928782A US 388255 A US388255 A US 388255A US 38825573 A US38825573 A US 38825573A US 3928782 A US3928782 A US 3928782A
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United States
Prior art keywords
tube
recesses
discharge tube
wall
particles
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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
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US388255A
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English (en)
Inventor
Esdonk Johannes Van
Johannes Petrus Hornman
Hass Franciscus Cupertinus De
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US Philips Corp
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US Philips Corp
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Filing date
Publication date
Application filed by US Philips Corp filed Critical US Philips Corp
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Publication of US3928782A publication Critical patent/US3928782A/en
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    • 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
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/82—Mounting, supporting, spacing, or insulating electron-optical or ion-optical arrangements
    • 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
    • H01J19/42—Mounting, supporting, spacing, or insulating of electrodes or of electrode assemblies
    • H01J19/50—Spacing members extending to the envelope
    • H01J19/52—Spacing members extending to the envelope without fixed connection between spacing member and envelope
    • 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
    • H01J2893/0002—Construction arrangements of electrode systems
    • H01J2893/0005—Fixing of electrodes
    • H01J2893/0009—Electrode system pressing against vessel wall

Definitions

  • ABSTRACT In manufacturing an electric discharge tube recesses are provided in the Wall of the tube by means of sandblasting or liquid honing. The electrodes of the electrode system of the tube are fixed in said recesses the shape and orientatio'rifof which are determined by a mask.
  • the invention relates to a method of manufacturing an electric discharge tube in which one or more recesses are provided in the wall of the tube and by means of which at least one component of the electrode system of the tube is fixed with respect to other components.
  • the invention furthermore relates to an electric discharge tube obtained by the above method.
  • a method of the type mentioned in the preamble is characterized according to the invention in that the recesses are provided in the wall of the tube by exposing it to the action of particles of grinding material incorporated in a flow of gas or liquid.
  • Such a method is generally referred to as sand-blasting when the grinding material is incorporated in a gas flow, and as liquid honing when the grinding material is incorporated in a flow of liquid.
  • sand-blasting when the grinding material is incorporated in a gas flow
  • liquid honing when the grinding material is incorporated in a flow of liquid.
  • These denominations will also be used hereinafter on the understanding that the particles of grinding material are not restricted to sand grains but in principle may consist of any suitable granular material, for example, aluminium oxide powder.
  • Sand-blasting and liquid honing presents a few advantages over the already mentioned methods.
  • the said recesses are obtained in a particularly rapid and in particular in a simple manner. These recesses do not show any sharp edges or abrupt transitions.
  • sand-blasting and liquid honing are known methods which are used in particular in surface treatments, such as frosting and cleaning, of hard materials.
  • accuracy hardly plays a part.
  • sand-blasting is generally considered as a rather coarse treatment, said method has never been used in the manufacture of articles which are subject to particularly small tolerances.
  • liquid honing it is to be noted that it is known from Dutch Patent application No. 6709115 to provide a groove in the wall of a television display tube by means of this method, which groove extends coaxially with the axis of the tube.
  • it deals with an accurately defined local weakening in the wall of the display tube.
  • accuracy with respect to the place of the groove is out of order.
  • a mask is preferably used. With said mask, the shape and orientation of the recesses are accurately determined since therewith the surfaces adjoining said recesses are protected from the action of the particles of grinding material.
  • a mask may be formed, for example, by one or more hollow cylinders which are slid so as to fit closely in the tube to be provided with grooves and which are fixed in the tube with respect to a certain reference.
  • the hollow cylinders themselves show slots or holes which have a shape corresponding to that of the desired recesses.
  • the said hollow cylinders are manufactured from material which is resistant to detrition, such as nylon or linen soaked in resin.
  • the recesses in the wall of the tube are preferably sand-blasted. This is done because liquid honing in the first place is a less clean operation and in the second place because the liquid with the particles of grinding agents suspended therein easily penetrate between the mask and the wall of the tube. As a result of this, scratches could be formed in the wall of the tube upon removing the mask, which scratches in the case of a glass tube could even result in fracture as a result of temperature fluctuations.
  • the recesses in the wall of the tube are preferably sand-blasted by means of powdered aluminium oxide.
  • Good results have been obtained with grinding material having an average grain dimension between 10 ,um and 20 ,um, and a largest grain size of at most 30 pm.
  • a sufficiently smooth bottom of the recesses without abrupt transitions is obtained with such a grain size, while tolerances of 50 um in the mutual distance of the recesses can be fulfilled as such.
  • FIG. 1 is an axial sectional view of a part of an electric discharge tube during the performance of a method according to the invention
  • FIG. 2 shows on an enlarged scale a sectional view of the coaxial groove 9 in FIG. 1;
  • FIG. 3 is an axial sectional view of a part of an electrode system mounted in a discharge tube manufactured according to the invention
  • FIG. 4 is a sectional view taken on the line IV-IV
  • FIG. 5 is a sectional view taken on the line V-V.
  • FIG. 6 is a sectional view taken on the line VIVI of the discharge tube of FIG. 2.
  • a glass tube 1 having a wall thickness of 1 mm and an inner diameter of 14 mm is clamped on a device which is not shown in the drawing.
  • the tube 1 can be moved axially according to the double arrow 2 and rotated about its axis in the direction of the arrow 3.
  • Particles of aluminium oxide incorporated in a flow of air are blown to a nozzle head 6 having a nozzle 7 via a nylon hose 5 at a pressure of '6 atm. in the direction of the arrow 4.
  • the nozzle 7 which has an inner diameter of 0.4 mm, the aluminium oxide grains 8 which have an average grain dimension of 17 um are directed on the glass wall of the tube 1.
  • a groove 9 having a width of 0.5 mm and a depth of 0.4 mm is obtained coaxially with the tube axis.
  • a mask formed by the hollow cylinders 10 and 11 consisting of a resin and having a wall thickness of 0.8 mm the place and width of the groove 9 are accurately determined.
  • the grooves 12 which extend in the axial direction have been obtained by moving the tube 1 in the axial direction during the sand-blasting operation.
  • the shape and the place of the grooves 12 are accurately determined by the slots 13 present in the hollow cylinder 11. After the desired recesses have thus been provided, the hollow cylinders 10 and 11 are removed from the tube 1.
  • the glass tube 1 is then rinsed in a hexane bath by means of ultrasonic vibrations and the various electrodes are finally fixed in the grooves 9 and 12.
  • a characteristic feature of recesses obtained by sand-blasting or liquid honing is that they do not show sharp edges or abrupt transitions.
  • the groove 9 of FIG. 1 which is shown in an enlarged crosssectional view in FIG. 2 shows rounded corners at 14 and 15. These facilitate not only the fixing of the electrodes but the removal thereof is also considerably simplified. The latter operation is necessary when an electrode has to be moved over one or more recesses before it reaches its place of destination.
  • FIG. 3 is an axial sectional view of a part of an electric discharge tube manufactured according to the invention.
  • a few recesses are provided on the inside of the hollow glass tube 20, in which recesses the electrodes 21, 22 and 23 are fixed.
  • Four resilient lugs 24 are spot-welded at one end to the electrode 21 to be fixed. The other end of each lug 24 bears in a recess 25 provided in the wall 20. Since the lugs 24 are slightly resilient in the radial direction, the electrode 21 can be inserted at one open end of a tube 20. In the place of destination, the lugs 24 snap into engagement with the recesses 25 destined for this purpose.
  • the cross-sectional view of FIG. 4 shows this once again.
  • electrode 22 shows a number of resilient lugs 26 which snap into engagement in the coaxial groove 27 as is shown in FIG. 5.
  • an electrode is used in a gauze electrode 23.
  • Such an electrode often forms part of the electrode system of a television camera tube of the vidicon type.
  • a gauze 23 clamped between two rings 28 during a thermal treatment is held in its place in that the rings 28 themselves are clamped between two locking springs 29 which each snap into engage ment with a coaxial groove 30.
  • Such a way of fixing which is shown again in the cross-sectional view of FIG. 6, ensures a perpendicular position of the gauze electrode 23 relative to the axis of the tube.
  • a number of electrodes 31 provided on the wall of the tube by vapour deposition or chemically can particularly readily be combined with the other electrodes.
  • the holes for the electric lead-throughs 32 have been obtained in the same operation and by means of the same mask as the above-described recesses.
  • the axial groove 33 does not serve as a fixing possibility for an electrode but is provided with a view to increasing the leakage path between the electrodes 31 so that higher electric potentials for the electrodes 31 can be permitted.
  • a method of manufacturing an electric discharge tube having a plurality of recesses in its inner wall for holding supporting parts of the electrode system of the tube comprising the steps of: fixing into the tube relative to a reference point a mask having openings corresponding to the shape and mutual displacement of the recesses to be created, and exposing the uncovered wall portions of the tube to the action of a jet of particles of grinding material incorporated in a fluid until the recesses are created.

Landscapes

  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Gas-Filled Discharge Tubes (AREA)
  • Microwave Tubes (AREA)
US388255A 1972-09-27 1973-08-14 Method of manufacturing an electric discharge tube and discharge tube obtained in this manner Expired - Lifetime US3928782A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7213022A NL7213022A (enrdf_load_stackoverflow) 1972-09-27 1972-09-27

Publications (1)

Publication Number Publication Date
US3928782A true US3928782A (en) 1975-12-23

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Family Applications (1)

Application Number Title Priority Date Filing Date
US388255A Expired - Lifetime US3928782A (en) 1972-09-27 1973-08-14 Method of manufacturing an electric discharge tube and discharge tube obtained in this manner

Country Status (10)

Country Link
US (1) US3928782A (enrdf_load_stackoverflow)
JP (1) JPS4971781A (enrdf_load_stackoverflow)
AU (1) AU6067473A (enrdf_load_stackoverflow)
BE (1) BE805361A (enrdf_load_stackoverflow)
CA (1) CA997150A (enrdf_load_stackoverflow)
DE (1) DE2345176A1 (enrdf_load_stackoverflow)
FR (1) FR2200612B1 (enrdf_load_stackoverflow)
GB (1) GB1389776A (enrdf_load_stackoverflow)
IT (1) IT1004580B (enrdf_load_stackoverflow)
NL (1) NL7213022A (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7613412A (nl) * 1976-12-02 1978-06-06 Philips Nv Elektrische ontladingsbuis.

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2731578A (en) * 1951-04-30 1956-01-17 Eitel Mccullough Inc Electron tube
US2980984A (en) * 1957-08-19 1961-04-25 Rca Corp Art of fabricating electron tubes
US2989046A (en) * 1958-06-05 1961-06-20 Paramount Pictures Corp Method for drilling finished holes in glass
US3328618A (en) * 1965-09-13 1967-06-27 High Voltage Engineering Corp High-voltage acceleration tube with inserts for the electrodes
US3396494A (en) * 1965-05-07 1968-08-13 Reynolds Metals Co Removal of protrusions formed on carbon anodes
US3423632A (en) * 1965-12-08 1969-01-21 Nippon Electric Co Electron discharge device construction
US3427644A (en) * 1963-10-01 1969-02-11 Sylvania Electric Prod Process of forming a matrix structure
US3444428A (en) * 1964-01-15 1969-05-13 Lignes Telegraph Telephon Magnetron anode blocks
US3604080A (en) * 1970-01-16 1971-09-14 Rca Corp Method for making an electron-tube grid assembly

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2731578A (en) * 1951-04-30 1956-01-17 Eitel Mccullough Inc Electron tube
US2980984A (en) * 1957-08-19 1961-04-25 Rca Corp Art of fabricating electron tubes
US2989046A (en) * 1958-06-05 1961-06-20 Paramount Pictures Corp Method for drilling finished holes in glass
US3427644A (en) * 1963-10-01 1969-02-11 Sylvania Electric Prod Process of forming a matrix structure
US3444428A (en) * 1964-01-15 1969-05-13 Lignes Telegraph Telephon Magnetron anode blocks
US3396494A (en) * 1965-05-07 1968-08-13 Reynolds Metals Co Removal of protrusions formed on carbon anodes
US3328618A (en) * 1965-09-13 1967-06-27 High Voltage Engineering Corp High-voltage acceleration tube with inserts for the electrodes
US3423632A (en) * 1965-12-08 1969-01-21 Nippon Electric Co Electron discharge device construction
US3604080A (en) * 1970-01-16 1971-09-14 Rca Corp Method for making an electron-tube grid assembly

Also Published As

Publication number Publication date
CA997150A (en) 1976-09-21
NL7213022A (enrdf_load_stackoverflow) 1974-03-29
AU6067473A (en) 1975-03-27
BE805361A (fr) 1974-03-26
IT1004580B (it) 1976-07-20
GB1389776A (en) 1975-04-09
DE2345176A1 (de) 1974-03-28
FR2200612A1 (enrdf_load_stackoverflow) 1974-04-19
JPS4971781A (enrdf_load_stackoverflow) 1974-07-11
FR2200612B1 (enrdf_load_stackoverflow) 1976-06-18

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