EP0093383A2 - Lampe à atmosphère gazeuse et son procédé de fabrication - Google Patents

Lampe à atmosphère gazeuse et son procédé de fabrication Download PDF

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Publication number
EP0093383A2
EP0093383A2 EP83104091A EP83104091A EP0093383A2 EP 0093383 A2 EP0093383 A2 EP 0093383A2 EP 83104091 A EP83104091 A EP 83104091A EP 83104091 A EP83104091 A EP 83104091A EP 0093383 A2 EP0093383 A2 EP 0093383A2
Authority
EP
European Patent Office
Prior art keywords
envelope
lamp
mercury
trap
gas
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.)
Withdrawn
Application number
EP83104091A
Other languages
German (de)
English (en)
Other versions
EP0093383A3 (fr
Inventor
Robert A. Brigman
James R. West
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.)
UVP Inc
Original Assignee
UVP Inc
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 UVP Inc filed Critical UVP Inc
Publication of EP0093383A2 publication Critical patent/EP0093383A2/fr
Publication of EP0093383A3 publication Critical patent/EP0093383A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
    • H01J5/02—Vessels; Containers; Shields associated therewith; Vacuum locks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/40—Closing vessels

Definitions

  • This invention relates generally to improvements in gas-filled lamps and methods of manufacturing such lamps and, more particularly, to a new and improved gas-filled lamp devoid of a weakened tip-off region, and an improved process for manufacturing such lamps in an efficient, economical and reliable manner.
  • tip-off region may severely limit the operating pressures which can be safely provided inside the lamp envelope, since the tip-off region represents a weakened area in the glass bulb which can rupture and explode in the presence of excessively high internal gas pressures within the lamp.
  • samples of such lamps must be explosion tested to mitigate the possibility of potentially extensive and costly damage to the environments in which the lamps are used in the event of such explosions.
  • the present invention provides a new and improved gas-filled lamp devoid of the usual weakened tip-off region on the glass envelope of the lamp, and further provides a new and improved method of manufacturing such lamps wherein the glass envelope is provided with a coaxial mercury trap at one end of the glass envelope and all pumping of gas is accomplished at the opposite, coaxial end of the envelope where the electrode enters the glass.
  • the new and improved gas-filled lamp is manufactured by providing a glass envelope with a coaxial mercury trap at one end of the envelope adjacent an electrode and opposite the pumping end of the envelope.
  • a pair of coaxial cathode and anode electrodes are inserted through the open pumping end of the envelope, air is pumped out of the envelope and a suitable fill gas is pumped into the envelope.
  • the envelope is then shrunk down onto the electrode at the pumping end, mercury is tipped from the mercury trap into the bulb portion of the envelope, and the mercury is held against the remote colder region of the envelope bulb while simultaneously shrinking down the envelope into sealing engagement with the second electrode.
  • each of the sealed ends of the lamp may be covered by a suitable electrode cap or the like which serves to further cover and/or reinforce the sealed ends.
  • the new and improved gas-filled lamp and method for lamp manufacture of the present invention provides a safer, substantially explosion-proof lamp capable of successfully withstanding higher internal gas pressures than lamps of the prior art, and the manufacturing process simplifies the manufacturing procedures in an efficient, economical and reliable manner.
  • the present invention relates to a new and improved gas-filled lamp, such as a mercury short-arc lamp, and a method of manufacturing such a lamp, wherein the usual lamp tip-off region can be eliminated.
  • a glass stem is normally used to evacuate the lamp envelope and to introduce mercury to the inside of the lamp in conventional manufacturing procedures.
  • the stem is then sealed or tipped-off, leaving a weakened area subject to rupture and explosion from high internal gas pressure within the lamp.
  • evacuation is accomplished at one end of the lamp envelope and introduction of mercury is accomplished at the opposite end of the envelope, adjacent the lamp electrodes, rather than forming a separate stem on the envelope bulb for that purpose.
  • the envelope ends When the envelope ends are sealed, they may then be covered by electrode caps or the like which further serve to cover and/or reinforce the terminal ends of the lamp.
  • FIGs. la-li of the drawings a prior art technique for forming a conventional gas-filled lamp with associated tip-off region on the glass bulb is described, in order to facilitate a better understanding of the present invention which will be subsequently contrasted with the prior art process.
  • the process begins by drawing glass tubing from stock and cutting to length to provide a pair of smaller end tubes 10, 12 and a larger midsection 11 which ultimately will define the bulb region of the lamp envelope.
  • the tubing is then placed in a lathe and attached together to form the lamp body or envelope.
  • a hole is blown in the bulb to attach a hollow pumping stem 13, as illustrated in FIG. lb. This is done by heating a small area on the bulb and holding the pressure inside the bulb until the hole opens.
  • the pumping stem 13, which is normally a two-inch length of quartz tubing, is then fused to the bulb directly over the previously formed hole.
  • the entire length of the body is then fire-polished to remove any quartz dust produced during forming of the body and attaching of the pumping stem 13. Once this has been accomplished, a small area on the body arm 10 is heated to seal one end 14 and prepare the envelope for electrode loading.
  • a pair of coaxial electrodes 15, -16 are loaded into the envelope through the open end 17 which is then, in turn, sealed off in the same manner as the end 14.
  • the lamp envelope is attached to a suitable pump 18 to evacuate the lamp. Subsequently, the lamp is baked out to drive out moisture and impurities. The lamp may also be purged with nitrogen.
  • the lamp is removed from the pump 18 by heating the pumping stem 13 with a torch to close off the pumping stem and leave approximately 1-1/2" of stem remaining attached to the lamp bulb.
  • Both electrodes 15, 16 are then set into place coaxially at opposite ends of the glass envelope and the envelope is then shrunk onto the ribbon of each electrode to seal the lamp.
  • the setting of the electrodes is typically accomplished by hand, using a fixed bench torch and spinning the lamp in the flame.
  • the shrinking process is accomplished in a glass lathe using a hand torch. Once the lamp is shrunk onto the electrodes 15, 16, it is ready to pump and fill.
  • the pump and fill operation begins by breaking open the pumping stem 13 and attaching a mercury trap 19 which is typically a section of 2 mm x 4 mm tubing with a small bubble blown in the center of the tubing.
  • a mercury trap 19 which is typically a section of 2 mm x 4 mm tubing with a small bubble blown in the center of the tubing. This bubble is adapted to contain the mercury during the pump and fill operation. It is not desirable to insert the mercury directly into the glass envelope at any earlier stage of the process because the mercury might vaporize and cause the envelope to explode, or provide offsetting pressure during the shrinking process.
  • one end of the mercury trap is sealed onto the pumping stem 13 which has been broken open again so that the trap can be attached to the stem by heating with a torch.
  • the mercury trap 19 is sealed onto the stem 13, it is loaded with the proper quantity of mercury 21 and the open end of the trap is attached to the pump 18.
  • the lamp envelope is then evacuated to an appropriate pressure, after which the lamp is again baked out using a hand torch.
  • the lamp is backfilled with a predetermined amount of inert gas such as argon or xenon.
  • inert gas such as argon or xenon.
  • the mercury trap 19 is then heated with a torch, while tipping the trap and the lamp, to run the mercury into the lamp envelope. As shown in FIG. li, the mercury trap is then removed or tipped-off, leaving a small bump or exhaust pip 23 on the lamp bulb. The tip-off region represents a weakened area in the glass envelope. At this point, the sealed lamp is ready for any external operations, such as the installation of electrode end caps.
  • FIGs. 2a-2g of the drawings the new and improved gas-filled lamp and method of manufacturing such a lamp will become apparent.
  • three pieces of tubing 10, 11 and 12 are again used to form the lamp body or envelope by placing the tubing in a lathe and attaching all the pieces together, using a hand torch.
  • FIG. 2b illustrates the formation of a coaxial mercury trap 25 at one end of the lamp envelope, after the entire length of the lamp body has first been fire-polished.
  • the mercury pocket 25 is typically provided by measuring approximately 4-1/2" from the lamp bulb on the side in which the trap is to be provided, applying heat to the glass (usually quartz) and allowing the glass to collapse to about half of its original internal diameter. The glass is then stretched until there is a passage of approximately 1 mm internal diameter. After this latter step, the glass is again heated approximately 1/4" further away from the bulb along the axis of the lamp envelope, to seal off the open end adjacent the mercury trap 25.
  • a predetermined quantity of mercury 21 is injected into the lamp envelope and tapped down into the mercury pocket 25.
  • the electrodes 15, 16 are next loaded into the envelope, the coaxial cathode 15 first (closest to the mercury trap) followed by the coaxial anode electrode 16.
  • the lamp is ready to attach to the pump 18 so that it can be evacuated, baked out, cooled under vacuum and then backfilled with a predetermined amount of inert gas, such as argon or xenon.
  • inert gas such as argon or xenon.
  • FIG. 2e shows the lamp removed from the pump and sealed off.
  • the anode is set into place carefully by hand-positioning, and the glass envelope is shrunk down onto the ribbon of the anode electrode 16 by heating with a torch.
  • the anode end of the lamp is elevated relative to the cathode end to keep the cathode electrode 15 and the mercury 21 out of the envelope bulb.
  • the lamp is removed from the glass lathe and the cathode is set into place by collapsing portions of the glass envelope onto the corners of the cathode ribbon at location 27a, 27b, (FIG. 2f) leaving enough of a clearance passage for the mercury 21 to run down the end of the lamp into the bulb.
  • the mercury 21 is run down into the lamp bulb, by heating the mercury pocket 25 with a torch while tipping the lamp so that the anode end is lower than the cathode end.
  • the final set on the cathode electrode 15 is performed by shrinking down the glass envelope into sealing engagement with the ribbon of the cathode electrode, using a torch.
  • the mercury 21 is held against the portion of the lamp bulb remote from the cathode electrode 15, i.e., adjacent the anode electrode 16, which is the coolest region of the lamp bulb during the cathode shrinking process, and thus mitigates the possible excess vaporization of the mercury which might otherwise pose the threat of explosion.
  • the mercury trap 25 is removed and, using a torch, the cathode end of the envelope is sealed, thus readying the lamp for any external operations, such as the installation of electrode end caps (not shown).
  • the gas-filled lamp and method of manufacture of the present invention satisfies a long existing need for a new and improved lamp wherein the usual lamp tip-off region and its associated problems are eliminated and, further, for a simplified, efficient, reliable and cost effective method for manufacturing such lamps.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
EP83104091A 1982-05-03 1983-04-26 Lampe à atmosphère gazeuse et son procédé de fabrication Withdrawn EP0093383A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US37403882A 1982-05-03 1982-05-03
US374038 1982-05-03

Publications (2)

Publication Number Publication Date
EP0093383A2 true EP0093383A2 (fr) 1983-11-09
EP0093383A3 EP0093383A3 (fr) 1984-07-18

Family

ID=23474984

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83104091A Withdrawn EP0093383A3 (fr) 1982-05-03 1983-04-26 Lampe à atmosphère gazeuse et son procédé de fabrication

Country Status (1)

Country Link
EP (1) EP0093383A3 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3500022A1 (de) * 1984-01-04 1985-07-11 Gte Products Corp., Wilmington, Del. Verfahren zum herstellen von kapseln mit genau bemessenem materialinhalt
GB2252199A (en) * 1990-11-27 1992-07-29 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh High pressure sodium discharge lamps
EP0938125A3 (fr) * 1998-02-18 2002-01-23 Phoenix Electric Co., Ltd. Lampe à décharge électrique et procédé pour sa fabrication
WO2001037307A3 (fr) * 1999-11-17 2002-02-14 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Procede de fabrication d'une lampe
US8212479B2 (en) 2006-07-13 2012-07-03 Osram Ag High-pressure discharge lamp with improved intensity distribution
CN115582950A (zh) * 2022-07-12 2023-01-10 柴群群 一种用于亚克力吸顶灯的外壳火抛处理装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE642327C (de) * 1935-05-22 1937-03-01 Patra Patent Treuhand Verfahren zur Herstellung von Quecksilberdampflampen sehr hohen Dampfdruckes
US2550658A (en) * 1947-03-29 1951-04-24 Sylvania Electric Prod Exhaust tubulation
FR1392384A (fr) * 1964-05-08 1965-03-12 Lampes Sa Perfectionnements aux procédés de fabrication de lampes électriques
US3466488A (en) * 1966-08-22 1969-09-09 Sylvania Electric Prod Arc discharge envelope and method of making same with three butted glassy tubes

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3500022A1 (de) * 1984-01-04 1985-07-11 Gte Products Corp., Wilmington, Del. Verfahren zum herstellen von kapseln mit genau bemessenem materialinhalt
GB2252199A (en) * 1990-11-27 1992-07-29 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh High pressure sodium discharge lamps
US5192239A (en) * 1990-11-27 1993-03-09 Patent Treuhand Gesellschaft Fur Elektrische Gluhlampen M.B.H. Method and apparatus to make a discharge vessel for a sodium high-pressure discharge lamp
GB2252199B (en) * 1990-11-27 1994-12-07 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Improvements in or relating to high pressure sodium lamps
EP0938125A3 (fr) * 1998-02-18 2002-01-23 Phoenix Electric Co., Ltd. Lampe à décharge électrique et procédé pour sa fabrication
WO2001037307A3 (fr) * 1999-11-17 2002-02-14 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Procede de fabrication d'une lampe
KR100735173B1 (ko) * 1999-11-17 2007-07-03 파텐트-트로이한트-게젤샤프트 퓌어 엘렉트리쉐 글뤼람펜 엠베하 램프 제조 방법
US8212479B2 (en) 2006-07-13 2012-07-03 Osram Ag High-pressure discharge lamp with improved intensity distribution
CN115582950A (zh) * 2022-07-12 2023-01-10 柴群群 一种用于亚克力吸顶灯的外壳火抛处理装置

Also Published As

Publication number Publication date
EP0093383A3 (fr) 1984-07-18

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Effective date: 19850319

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Inventor name: BRIGMAN, ROBERT A.

Inventor name: WEST, JAMES R.