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US3790837A - Method of making a gas- and/or vapour discharge tube ready for operation - Google Patents

Method of making a gas- and/or vapour discharge tube ready for operation Download PDF

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Publication number
US3790837A
US3790837A US00250348A US3790837DA US3790837A US 3790837 A US3790837 A US 3790837A US 00250348 A US00250348 A US 00250348A US 3790837D A US3790837D A US 3790837DA US 3790837 A US3790837 A US 3790837A
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US
United States
Prior art keywords
heat shield
discharge tube
parts
tube
wall
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
US00250348A
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English (en)
Inventor
A Timmermans
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Individual
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Individual
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Publication of US3790837A publication Critical patent/US3790837A/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/04—Electrodes; Screens; Shields
    • H01J61/045—Thermic screens or reflectors

Definitions

  • the invention relates to a method of making a gasand/or vapour discharge tube ready for operation, in which at least one external part of the wall of the discharge tube is covered by an adjustable heat shield, which is adjusted when the tube is made ready for operation, and furthermore the invention relates to a discharge tube made ready for operation by this method.
  • a heat shield which consists of a paint coating including aluminum
  • the heat shield may only bemodified by either providing more aluminium paint or by removing the paint coating from an already painted portion. Both methods require extra means while great care is to be taken in the use of the paint coating.
  • An object of the invention is to provide a method of the kind described in the preamble in which on the one hand the drawback of resecurement of a shifted or deformed heat shield ,is prevented and in which on the other hand if some parts of the heat shield remain in their position the displacement of the other parts of the heat shield is very simple.
  • the heat shield is adjusted when the tube is made ready for operation is characterized in that firstly a too large heat shield consisting of ductile metal strip is provided on the wall of the discharge tube and that subsequently parts of this heat shield are removed from said wall, the remaining parts of the heat shield remaining in position.
  • An advantage of this method is that making the dis charge tube ready for operation is very simple in this case.
  • the only operation to be carried out is that some pieces of the ductile metal strip have to be removed from the wall of the discharged tube. This may be effected, for example, by hand or by means of simple pliers. In this case such a quantityof the ductile metal strip is removed until the desired condition of the discharge tube is obtained. Resecurement at a later stage of the other parts of the heat shield is no longer necessary in this case.
  • the metal strip may have a width which is equal to the width of the too large heat shield initially provided. It is alternatively feasible that the metal strip is less wide and that a plurality of these metal strips provided side by side or partly across each other constitutes the heat shield. In the latter case the adjustment of the heat shield may consist of winding several turns of this metal strip off the discharge tube.
  • parts of the heat shield are removed from the ex- 2 ternal wall of the discharge tube by bending these parts of the heat shield.
  • An advantage of this preferred method is that the entire removal of the superfluous parts of the heat shield from the discharge tube and discarding of this waste material is prevented.
  • parts of the heat shield are removed from the external wall of the discharge tube by tearing off these parts.
  • An advantage of the last-mentioned method is that the heat shield can be adjusted in a very simple manner, for example, by hand.
  • the heat shield is preferaby placed at one end of the tube comprising an electrode.
  • a discharge tube made ready for operation by means of a method according to the invention is preferably provided with a heat shield which has parts bent away from the wall of the discharge tube.
  • This is a discharge tube which is made ready for operation by means of a method in which some heat shield parts are removed, from the wall of the discharge tube, by bending.
  • the heat shield may have, for example, the same thickness everywhere. It is alternatively feasible that some parts of the heat shield are mechanically slightly weaker than other parts, namely for the purpose of bending away or tearing off parts of the shield from these mechanically weaker portions. Such a mechanically weak portion may be obtained in advance, for example, by notching theheat shield.
  • a perforation line is understood to means a line which connects a plurality of perforations placed one after the other.
  • Such a perforation line of the heat shield is preferably a closed line encompassng the discharge tube.
  • At least one portion of the surface of this shield has of course a slightly knurled shape which knurls consist of inter alia remaining circumferences of half perforations.
  • FIG. 1 shows a discharge tube still to undergo an operation according to the invention
  • FIG. 2 shows the same discharge tube as in FIG. 1 after having been subjected to a method according to the invention
  • FIG. 3 shows one end of the discharge tube before being subjected to a method according to the invention
  • FIG. 4 shows the end of the discharge tube as in FIG. 3 after having been subjected to a method according to the invention.
  • reference numeral 1 is a discharge tube intended for a high-pressure sodium vapour discharge lamp. It is, for example, a discharge tube for a lamp described in the United Kingdom Patent specification No. 1,205,871. The length of this discharge tube is approximately 11 cms and the external diameter is approximately 1 cm.
  • the discharge tube is connected to two supply conductors 2 and 3 which are provided on either side of the tube 1. Conductor 2 leads to an internal electrode present within one end of the tube. Conductor 3 leads to an internal electrode present in the other end of the tube 1. The electrodes are not visible.
  • Reference numerals 4 and 5 denote heat shields of metal strip, namely of tantalum having a thickness of 0.05 mm. Metal strip 4 and metal strip Sconstitute too large heat shields for this discharge tube 1.
  • each heat shield is initially provided with two perforation Ines. It is of course feasible that a heat shield is initially provided with only one perforation line or with more than two perforation lines.
  • FIG. 2 shows the situation where an annular strip has been torn off the heat shield 4, namely on the perforation line 7 and in which an annular strip has likewise been torn off the heat shield 5 on the perforation line 9.
  • the other reference numerals given in FIG. 2 of course also relate to the same components as those in FIG. 1.
  • FIG. 3 shows one end of a discharge tube which is likewise intended for a high-pressure sodium discharge lamp, namely as stated with reference to the test of FIG. 1.
  • the discharge tube of FIG. 3 is denoted by 10.
  • the reference numeral 12 denotes a supply conductor which leads to an electrode (not shown) present in the discharge tube.
  • the reference numeral 14 denotes a heat shield which is provided with a plurality of longitudinal grooves 15, 16, 17 etc. These grooves serve to easily bend parts of the heat shield at a later stage so that these parts no longer engage the wall of the discharge tube 10.
  • FIG. 4 again shows the discharge tube 10 of FIG. 3.
  • the reference numeral 12 denotes an electric supply conductor and 14 denotes a heat shield.
  • FIG. 4 shows a situation where a lug 20 of the heat shield located between the grooves 16 and 17 (of FIG. 3) is bent upwards. If desired further lugs of this heat shield 14 may be bent away from the discharge tube so that the temperature of this portion of the discharge tube can be adjusted to a slightly different value.
  • Tearing off and bending away can be effected, for example, by hand or by simple pliers in the described embodiments.
  • the adjustments of the heat shield in all these embodiments is very simple. It may therefore be used not only for one prototype of the discharge tube but for any discharge tube which is made in the normal manufacture. Thus all these tubes can be adjusted in a simple manner.
  • a method of making a gasand/or vapour discharge tube ready for operation in which at least one external part of the wall of the discharge tube is covered by an adjustable heat shield, which heat shield is adjusted when the tube is made ready for operation, characterized in that firstly a too large heat shield consisting of ductile metal strip is provided on the wall of the discharge tube and that subsequently parts of the heat shield are removed from said wall, the other parts of the heat shield remaining in position.

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  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
US00250348A 1971-05-08 1972-05-04 Method of making a gas- and/or vapour discharge tube ready for operation Expired - Lifetime US3790837A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7106348A NL7106348A (de) 1971-05-08 1971-05-08

Publications (1)

Publication Number Publication Date
US3790837A true US3790837A (en) 1974-02-05

Family

ID=19813116

Family Applications (1)

Application Number Title Priority Date Filing Date
US00250348A Expired - Lifetime US3790837A (en) 1971-05-08 1972-05-04 Method of making a gas- and/or vapour discharge tube ready for operation

Country Status (9)

Country Link
US (1) US3790837A (de)
AT (1) AT318076B (de)
AU (1) AU469996B2 (de)
BE (1) BE783167A (de)
CA (1) CA952972A (de)
DE (1) DE2221777A1 (de)
FR (1) FR2137618A1 (de)
GB (1) GB1334992A (de)
NL (1) NL7106348A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0026428A2 (de) * 1979-09-29 1981-04-08 Kabushiki Kaisha Toshiba Leuchtstofflampe
US4970431A (en) * 1987-11-03 1990-11-13 U.S. Philips Corporation High-pressure sodium discharge lamp with fins radially extending from the discharge vessel for controlling the wall temperature of the discharge vessel
US20100244647A1 (en) * 2007-10-19 2010-09-30 Osram Gesellschaft Mit Beschraenkter Haftung High-Pressure Discharge Lamp
US20110298370A1 (en) * 2010-06-03 2011-12-08 Ushio Denki Kabushiki Kaisha Extra-high pressure mercury lamp and method of manufacturing extra-high pressure mercury lamp of the same

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL168993C (nl) * 1975-01-17 1982-05-17 Philips Nv Werkwijze voor het bedrijven van een zelfstabiliserende ontladingslamp.
HU191305B (en) * 1984-03-29 1987-02-27 Tungsram Rt,Hu High pressure sodium or metal halogen lamp for dc operation

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3333132A (en) * 1964-05-19 1967-07-25 Westinghouse Electric Corp Discharge lamp having heat reflecting shields surrounding its electrodes

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3333132A (en) * 1964-05-19 1967-07-25 Westinghouse Electric Corp Discharge lamp having heat reflecting shields surrounding its electrodes

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0026428A2 (de) * 1979-09-29 1981-04-08 Kabushiki Kaisha Toshiba Leuchtstofflampe
EP0026428A3 (en) * 1979-09-29 1981-04-15 Tokyo Shibaura Denki Kabushiki Kaisha Fluorescent lamp
US4970431A (en) * 1987-11-03 1990-11-13 U.S. Philips Corporation High-pressure sodium discharge lamp with fins radially extending from the discharge vessel for controlling the wall temperature of the discharge vessel
US20100244647A1 (en) * 2007-10-19 2010-09-30 Osram Gesellschaft Mit Beschraenkter Haftung High-Pressure Discharge Lamp
US20110298370A1 (en) * 2010-06-03 2011-12-08 Ushio Denki Kabushiki Kaisha Extra-high pressure mercury lamp and method of manufacturing extra-high pressure mercury lamp of the same

Also Published As

Publication number Publication date
GB1334992A (en) 1973-10-24
AU4180872A (en) 1973-11-08
NL7106348A (de) 1972-11-10
AU469996B2 (en) 1976-02-26
AT318076B (de) 1974-09-25
FR2137618A1 (de) 1972-12-29
CA952972A (en) 1974-08-13
BE783167A (fr) 1972-11-08
DE2221777A1 (de) 1972-12-07

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