US3900237A - Method of making arch shaped arc tube - Google Patents

Method of making arch shaped arc tube Download PDF

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Publication number
US3900237A
US3900237A US386868A US38686873A US3900237A US 3900237 A US3900237 A US 3900237A US 386868 A US386868 A US 386868A US 38686873 A US38686873 A US 38686873A US 3900237 A US3900237 A US 3900237A
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Prior art keywords
tube
tubing
arch
opening
arc tube
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Expired - Lifetime
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US386868A
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Rudoph Marcucci
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GTE Sylvania Inc
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GTE Sylvania Inc
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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B23/00—Re-forming shaped glass
    • C03B23/04—Re-forming tubes or rods
    • C03B23/09—Reshaping the ends, e.g. as grooves, threads or mouths
    • C03B23/099—Reshaping the ends, e.g. as grooves, threads or mouths by fusing, e.g. flame sealing
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B23/00—Re-forming shaped glass
    • C03B23/04—Re-forming tubes or rods
    • C03B23/06—Re-forming tubes or rods by bending
    • C03B23/065—Re-forming tubes or rods by bending in only one plane, e.g. for making circular neon tubes
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B23/00—Re-forming shaped glass
    • C03B23/20—Uniting glass pieces by fusing without substantial reshaping
    • C03B23/207—Uniting glass rods, glass tubes, or hollow glassware
    • C03B23/213—Joining projections or feet
    • 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
    • H01J9/24—Manufacture or joining of vessels, leading-in conductors or bases
    • H01J9/245—Manufacture or joining of vessels, leading-in conductors or bases specially adapted for gas discharge tubes or lamps
    • H01J9/247—Manufacture or joining of vessels, leading-in conductors or bases specially adapted for gas discharge tubes or lamps specially adapted for gas-discharge lamps

Definitions

  • ABSTRACT In the manufacture of an arch shaped arc tube having electrodes sealed at its ends, a cylindrical tube of quartz is prepared with smaller diameter quartz tubing extending from its ends. The tube is then bent into an arch shape and electrodes are vacuum sealed into the tubing extensions, using a suitably shaped exhaust tube fastened to the center of the arc tube as a support.
  • This invention is in the field of high intensity are discharge lamps and relates particularly to the manufacture of arc tubes used in such lamps.
  • the are tubes of'such lamps have generally been straight cylindrical tubes having electrodes at each end. usually sealed therein by press seals.
  • This invention is concerned with the manufacture of an arch shape are tube, which can be used with a horizontally operated high intensity are discharge lamp to increase the efficiency thereof.
  • FIGS. 1-5 show the sequential steps in the manufacture of an arc tube in accordance with this invention.
  • tubes 1 and 2 were each 4 inches long having inner and outer diam eters of 4 mm and 8 mm respectively.
  • Tube 3 was 55 mm long and had inner and outer diameters of and 22 mm respectively.
  • Tube 3 was then heated, such as by an oxygenhydrogen flame, to the softening point of quartz and then bent into an arch shape, as shown in FIG. 2.
  • the angle formed by tubes 1 and 2 was 140.
  • tubulation 4 was attached to the center of arch shaped tube 3 after an opening had been made in the wall of tube 3 thereat, so that passage was provided from the interior of tube 3 to the interior of tubulation 4, as shown in FIG. 3.
  • tubulation 4 had an inner diameter of2 mm and an outer diameter of 3 mm.
  • Tubulation 4 was then bent into a shape so as to be in alignment with one of the extending tubes, say, tube 1.
  • An electrode assembly comprising electrode 5 fastened to a thin molybdenum ribbon 6 fastened, in turn,
  • the assembly was then placed in a suitable lathe, with tube 1 held within a chuck and tubulation 4 held within another chuck. Prior to this step, the end of tubulation 4 had been scaled by melting, so that vacuum exhaust could be effected through the open end of tube 1. Tube 1 was then sealed by heating an intermediate portion thereof to its softening point, while the assembly was rotated, and permitting the vacuum to collapse the walls of tube 1 to effect a hermetic seal.
  • the hermetic seal region included the entire length of ribbon 6. After removal from the lathe, the excess length of tube 1 was removed, thereby permitting lead-in wire 7 to extend beyond the end of tube 1.
  • FIG. 5 shows the arc tube with a straightened (or new) tubulation 4 ready for exhaustion, filling and final sealing of the arc tube.
  • the filling usually includes mercury and an inert starting gas.
  • steps which comprise: join ing two lengths of quartz tubing to the ends of a larger diameter cylindrical quartz tube; bending the cylindrical quartz tube into an arch shape; forming an opening in the wall of the arch tube, said opening being substantially at the longitudinal center of the arch tube; joining an exhaust tube to the arch tube in alignment with said opening; bending the exhaust tube into axial alignment with one of the lengths of tubing; sealing the open end of said exhaust tube and the open end of the other length of tubing; inserting an electrode assembly including a molybdenum ribbon into said one length of tubing and vacuum sealing the tubing onto a molybdenum ribbon.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)

Abstract

In the manufacture of an arch shaped arc tube having electrodes sealed at its ends, a cylindrical tube of quartz is prepared with smaller diameter quartz tubing extending from its ends. The tube is then bent into an arch shape and electrodes are vacuum sealed into the tubing extensions, using a suitably shaped exhaust tube fastened to the center of the arc tube as a support.

Description

United States Patent 11 .1
Marcucci Aug. 19, 1975 METHOD OF MAKING ARCH SHAPED ARC TUBE [75] Inventor:
[73] Assignee: GTE Sylvania Incorporated,
Danvers, Mass.
{22] Filed: Aug. 9, 1973 [21] Appl. No.: 386,868
Rudoph Marcucci, Beverly, Mass.
52 us. c1. 316/20; 65/59; 313/220 51 1m. (:1. HOlj 9/38 58 Field Of Search 316/17, 18, 19, 20, 21; 313/220, 317; 29/25.]6; 220/21 R; 65/34,
[56] References Cited UNITED STATES PATENTS 7611.789 5/1904 Hewitt 1. 316/26 2,145,157 l/l939 Cowhig 316/19 3,260,583 7/ l 966 Eisler 3,466,488 9/1969 Evans et a1 220/2.1 R
Primary ExaminerRoy Lake Assistant Examiner-James W. Davie Attorney, Agent, or Firm1ames Theodosopoulos [57] ABSTRACT In the manufacture of an arch shaped arc tube having electrodes sealed at its ends, a cylindrical tube of quartz is prepared with smaller diameter quartz tubing extending from its ends. The tube is then bent into an arch shape and electrodes are vacuum sealed into the tubing extensions, using a suitably shaped exhaust tube fastened to the center of the arc tube as a support.
3 Claims, 5 Drawing Figures PATENTEB Am; 1 9 I975 SHEET 2 UP 2 FIG.
METHOD OF MAKING ARCH SHAPED ARC TUBE THE INVENTION This invention is in the field of high intensity are discharge lamps and relates particularly to the manufacture of arc tubes used in such lamps.
The are tubes of'such lamps have generally been straight cylindrical tubes having electrodes at each end. usually sealed therein by press seals.
This invention is concerned with the manufacture of an arch shape are tube, which can be used with a horizontally operated high intensity are discharge lamp to increase the efficiency thereof.
As a brief description of the drawing FIGS. 1-5 show the sequential steps in the manufacture of an arc tube in accordance with this invention.
As shown in FIGv I, initially two lengths of quartz tubing I and 2 were joined to the ends ofa larger diam eter quartz tube 3. In a specific example. tubes 1 and 2 were each 4 inches long having inner and outer diam eters of 4 mm and 8 mm respectively. Tube 3 was 55 mm long and had inner and outer diameters of and 22 mm respectively.
Tube 3 was then heated, such as by an oxygenhydrogen flame, to the softening point of quartz and then bent into an arch shape, as shown in FIG. 2. In the specific example, the angle formed by tubes 1 and 2 was 140.
Next. a quartz tubulation 4 was attached to the center of arch shaped tube 3 after an opening had been made in the wall of tube 3 thereat, so that passage was provided from the interior of tube 3 to the interior of tubulation 4, as shown in FIG. 3. In the specific example, tubulation 4 had an inner diameter of2 mm and an outer diameter of 3 mm.
Tubulation 4 was then bent into a shape so as to be in alignment with one of the extending tubes, say, tube 1. An electrode assembly comprising electrode 5 fastened to a thin molybdenum ribbon 6 fastened, in turn,
- to a lead-in wire 7 was then inserted through tube 1 so that electrode 5 extended into tube 3 while all of ribbon 6 was contained within tube 1. The open end of tube 2 had been sealed by melting.
The assembly was then placed in a suitable lathe, with tube 1 held within a chuck and tubulation 4 held within another chuck. Prior to this step, the end of tubulation 4 had been scaled by melting, so that vacuum exhaust could be effected through the open end of tube 1. Tube 1 was then sealed by heating an intermediate portion thereof to its softening point, while the assembly was rotated, and permitting the vacuum to collapse the walls of tube 1 to effect a hermetic seal. The hermetic seal region included the entire length of ribbon 6. After removal from the lathe, the excess length of tube 1 was removed, thereby permitting lead-in wire 7 to extend beyond the end of tube 1.
Tubulation 4 was then heated and bent to be in alignment with the other extending tubing, tube 2 and the tube 2 is opened. The assembly was then again mounted in the lathe, as shown in FIG. 4, with tube 2 held within chuck 8 and tubulation 4 held within chuck 9. Tube 2 was then hermetically sealed around ribbon 6 and the excess length removed, as before. FIG. 5 shows the arc tube with a straightened (or new) tubulation 4 ready for exhaustion, filling and final sealing of the arc tube. The filling usually includes mercury and an inert starting gas.
I claim:
1. In the manufacture of an arc tube for a high intensity arc discharge lamp, the steps which comprise: join ing two lengths of quartz tubing to the ends of a larger diameter cylindrical quartz tube; bending the cylindrical quartz tube into an arch shape; forming an opening in the wall of the arch tube, said opening being substantially at the longitudinal center of the arch tube; joining an exhaust tube to the arch tube in alignment with said opening; bending the exhaust tube into axial alignment with one of the lengths of tubing; sealing the open end of said exhaust tube and the open end of the other length of tubing; inserting an electrode assembly including a molybdenum ribbon into said one length of tubing and vacuum sealing the tubing onto a molybdenum ribbon.
2. The process of claim 1 including the step of rebending the exhaust tube into axial alignment with the other length of tubing; opening the sealed end of said other tubing; and vacuum sealing an electrode assembly in said other tubing.
3. The process of claim 2 including the step of exhausting and filling the arc tube through the exhaust

Claims (3)

1. In the manufacture of an arc tube for a high intensity arc discharge lamp, the steps which comprise: joining two lengths of quartz tubing to the ends of a larger diameter cylindrical quartz tube; bending the cylindrical quartz tube into an arch shape; forming an opening in the wall of the arch tube, said opening being substantially at the longitudinal center of the arch tube; joining an exhaust tube to the arch tube in alignment with said opening; bending the exhaust tube into axial alignment with one of the lengths of tubing; sealing the open end of said exhaust tube and the open end of the other length of tubing; inserting an electrode assembly including a molybdenum ribbon into said one length of tubing and vacuum sealing the tubing onto a molybdenum ribbon.
2. The process of claim 1 including the step of rebending the exhaust tube into axial alignment with the other length of tubing; opening the sealed end of said other tubing; and vacuum sealing an electrode assembly in said other tubing.
3. The process of claim 2 including the step of exhausting and filling the arc tube through the exhaust tube.
US386868A 1973-08-09 1973-08-09 Method of making arch shaped arc tube Expired - Lifetime US3900237A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4340264A (en) * 1979-07-05 1982-07-20 The Perkin-Elmer Corporation Manufacture of glass base lamp
US4498027A (en) * 1982-06-11 1985-02-05 Gte Products Corporation Arc discharge lamp with improved starting capabilities, improved efficacy and maintenance, and line-of-sight arched arc tube for use therewith
US5353113A (en) * 1993-07-15 1994-10-04 Cetac Technologies Incorporated Single and multiple radiation transparent afterglow electric discharge detector systems
US5382804A (en) * 1993-07-15 1995-01-17 Cetac Technologies Inc. Compact photoinization systems
US20050212433A1 (en) * 2005-06-20 2005-09-29 Osram Sylvania Inc. Single-ended discharge vessel with diverging electrodes

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US760789A (en) * 1903-12-04 1904-05-24 Cooper Hewitt Electric Co Vapor-electric-lamp manufacture.
US2145157A (en) * 1937-07-13 1939-01-24 Gen Electric Incandescent electric lamp
US3260583A (en) * 1963-02-21 1966-07-12 Eisler Engineering Co Method of sealing glass tubes
US3466488A (en) * 1966-08-22 1969-09-09 Sylvania Electric Prod Arc discharge envelope and method of making same with three butted glassy tubes

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US760789A (en) * 1903-12-04 1904-05-24 Cooper Hewitt Electric Co Vapor-electric-lamp manufacture.
US2145157A (en) * 1937-07-13 1939-01-24 Gen Electric Incandescent electric lamp
US3260583A (en) * 1963-02-21 1966-07-12 Eisler Engineering Co Method of sealing glass tubes
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 (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4340264A (en) * 1979-07-05 1982-07-20 The Perkin-Elmer Corporation Manufacture of glass base lamp
US4498027A (en) * 1982-06-11 1985-02-05 Gte Products Corporation Arc discharge lamp with improved starting capabilities, improved efficacy and maintenance, and line-of-sight arched arc tube for use therewith
US5353113A (en) * 1993-07-15 1994-10-04 Cetac Technologies Incorporated Single and multiple radiation transparent afterglow electric discharge detector systems
US5382804A (en) * 1993-07-15 1995-01-17 Cetac Technologies Inc. Compact photoinization systems
US20050212433A1 (en) * 2005-06-20 2005-09-29 Osram Sylvania Inc. Single-ended discharge vessel with diverging electrodes
US7414366B2 (en) * 2005-06-20 2008-08-19 Osram Sylvania Inc. Single-ended discharge vessel with diverging electrodes

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