US3904908A - Manufacture of electrical devices having sealed envelopes - Google Patents

Manufacture of electrical devices having sealed envelopes Download PDF

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Publication number
US3904908A
US3904908A US387595A US38759573A US3904908A US 3904908 A US3904908 A US 3904908A US 387595 A US387595 A US 387595A US 38759573 A US38759573 A US 38759573A US 3904908 A US3904908 A US 3904908A
Authority
US
United States
Prior art keywords
envelope
mounting member
fingers
bracing means
sealed
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
US387595A
Other languages
English (en)
Inventor
Kenneth Roy Wolfe
Maurice George Clarke
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.)
Thorn Electrical Industries Ltd
Original Assignee
Thorn Electrical Industries Ltd
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 Thorn Electrical Industries Ltd filed Critical Thorn Electrical Industries Ltd
Application granted granted Critical
Publication of US3904908A publication Critical patent/US3904908A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K3/00—Apparatus or processes adapted to the manufacture, installing, removal, or maintenance of incandescent lamps or parts thereof
    • H01K3/08—Manufacture of mounts or stems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/18—Mountings or supports for the incandescent body
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K3/00—Apparatus or processes adapted to the manufacture, installing, removal, or maintenance of incandescent lamps or parts thereof
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making

Definitions

  • the present invention relates to improvements in the manufacture of electrical devices which incorporate sealed encapsulations or envelopes, such as lamps. valves and the like When making lamps in the past. it has been customary to install supporting wires inside their envelopes.
  • the wires carrying various internal lamp components of an electrical or optical nature Etamples of such components include filaments, shields and reflectors.
  • Some of the supporting wires also serve as current conductors and. are sealed through the lamp envelopes so as to be accessible from the outside. Frequently. it is necessary to locate the filaments of lamps accurately relative to lenses or reflectors in optical apparatus.
  • the lamps be manufactured to within very small tolerances. It is far from easy to accomplish this by any massproduction technique. since cylindrical wires forming filaments and supporting wires are prone to distortion by shifting. bending and rolling during various phases of the manufacturing process.
  • the internal components may include filaments. anodes. cathodes. grids and screens. which need be accurately located relative to one another.
  • the aim of the present invention is to improve and simplify the manufacturing techniques by eliminating the need for embedding the support wires in insulating bridge members. whilst still retaining adequate stiffness as a safeguard against distortion.
  • a method of making an electrical device having an enclosing scaled envelope comprising the steps of making a metallic mounting member having a plurality of fingers which are interconnected by a transverse brace. attaching components of the device to the fingers. loeating the mounting member and the components borne thereby within an envelope, forming a seal be tween the envelope and the mounting member with the transverse brace inside the envelope. and thereafter breaching the brace by focus-sing a beam of radiation from a laser onto the brace so as to isolate selected fingers mechanically and electrically from one another. After breaching the brace. the isolated fingers remain supported within the envelope as a result of being sealed thereto.
  • the exact nature of the internal components depend upon the type of device being made.
  • the mounting member can be fabricated from wires. it is preferred though not essential to make it from sheet metal.
  • a sheet metal blank can be shaped. to define the fingers and brace. by such techniques as pressing. stamping, photo-etching and spark machining. inter alia.
  • the fingers are made sufficientlylong that they will project outwardly of the seal. in this case. it may be desirable so to form the mounting memher that the outer ends of the fingers are also provided with a transverse stiffening brace. This brace will help to ensure that the outer ends of the fingers remain pre cisely located with one another before and during seal ing. The stiffening brace is cropped off after sealing.
  • the invention can be applied to the manufacture of such lamps as single and twin fil ament vehicle lightbulbs. GLS bulbs. monoplane filament lamps for projectors and the like. as well as to other glass encapsulated devices.
  • FIG. 1 is a plan view of a filament mount assembly before scaling into an envelope when manufacturing a lamp in accordance with the invention
  • FIG. 2 is a perspective view of a completed lamp.
  • the completed lamp ]0 shown in FIG. 2 is a doublefilament tungsten halogen vehicle headlamp bulb. of the type known as the H4.
  • the lamp 10 has a tubular envelope of high silica content ll which is sealed at its opposite ends and contains a conventional gas filling including a halogen.
  • Inside the envelope 11 there are two filaments l2. l3 and a reflector or shield 14.
  • the filaments I2, 13 and the shield 14 are supported on a sheet metal mount indicated generally by the reference 16.
  • the mount 16 has three separate fingers or branches l7, l8 and 19.
  • the branches l7, l8 and 19 form current conductors and each is attached to a thin molybdenum foil 20 about which the envelope ll is pinched to form an hermetic seal.
  • the foils 20 are pro vided with sheet metal tails 22 which extend outwardly from the pinch seal 23 for connection to appropriate contacts of a lamp cap (not shown).
  • the mount 16 is made from any metal which will withstand the operating temperature within the lamp 10.
  • a refractory metal such as molybdenum may be Chosen.
  • the foils 20 can be omitted if desired. in which case the branches l7. l8 and 19 are lengthened as indicated by the chaindashed lines in FIG. 1 so as to embody the tails 22. It may be necessary to reduce the thickness of the branches 1?. l8 and l) locally, in the region of the pinch 23, to assure a mechanically satisfactory seal at elevated temperatures.
  • the mount 16 is shown in more detail in FIG. 1, and is shaped by any convenient operation such as punching or photo-etching a molybdenum sheet blank. As shown. the fingers or branches l7. l8 and 19 are inter connected intermediate their ends by transverse brac ing portions 31 and 32.
  • the next step in manufacturing the lamp It involves attaching the filaments l2, l3 and shield 14 to the mount 16.
  • the shield 14 is a deep-drawn or cupped bowl which is mounted on a molybdenum strip support 34 e.g. by spot welding.
  • One end of the filament 12 is secured and electrically connected to the branch 17 by a member 35 which includes a tang (not shown).
  • the other end of the filament 12 is attached to the branch 18 at its free end by another tang 36 which is bent over to grip the end of the filament 12.
  • the fila ment 13 is secured between the support 34 and the free end of the branch 19 in a similar fashion, i.e., by bending over tangs 37 to grip the ends of the filament 13.
  • the foils 20 and tails 22 are then secured to the ends 38 of the branches l7, l8 and 19 by welding. This completes the mount and filament assembly which is now ready for inserting into the envelope tube 11.
  • the pinch seal 23 is made in the usual way.
  • the envelope tube 11 is open at its opposite end 40 and is fitted with an exhaust tube (not shown).
  • the exhaust tube is then attached to a pumping machine and the air is evacuated from the tube 11. Thereafter, the tube is flushed and filled with an appropriate gas, e.g. argon.
  • the exahust tube is then sealed off to leave the exhaust tip seen at the end 40 of the envelope tube 11.
  • the final manufacturing steps can be effected. These steps may include fitting a lamp cap (not shown) to the pinch seal 23 and electrically isolating the fingers or branches 1?, l8 and 19 from one another.
  • the branches 17, 18 and 19 are isolated by severing or breaching the transverse bracing portions 31, 32. These portions are breached by causing the sheet metal to evaporate leaving the gaps 42 seen in FIG. 2.
  • the gaps 42 are formed by focussing a beam of radiation from a alaser onto the portions 31, 32. It has been found that no damage to the envelope tube 11 will result, provided care is taken to ensure that the beam is not focussed on the envelope tube.
  • the foils 20 and tails 22 can be eliminated, for simplicity, in which case the branches 17, 18 and 19 are extended as shown by chain-dashed lines.
  • An additional transverse brace or bridge 45 is desirably attached to the ends of branches as shown to strengthen the mount 16 and enable it to be handled safely. The brace 45 is retained until after the mount and filament assembly has been scaled to the envelope tube 11. The brace 45 is then severed from the branches l7, l8 and 19 along the line 46.
  • bracing means is located intermediate the ends of said mounting member and nearer one end thereof than the other, lead out conductors including refractory metal foils being welded to finger ends adjacent said bracing means, and said envelope being sealed to said foils.
  • bracing means is located intermediate the ends of said mounting member, said mounting member being provided with a transverse bridge at one end thereof which also interconnects said fingers, said mounting member being inserted into said envelope and the latter being sealed directly thereto, said transverse bridge being disposed externally of said envelope and being removed subsequent to said sealing step.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Package Closures (AREA)
  • Making Paper Articles (AREA)
US387595A 1972-08-11 1973-08-13 Manufacture of electrical devices having sealed envelopes Expired - Lifetime US3904908A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3764672A GB1430070A (en) 1972-08-11 1972-08-11 Manufacture of electrical devices having sealed envelopes

Publications (1)

Publication Number Publication Date
US3904908A true US3904908A (en) 1975-09-09

Family

ID=10397961

Family Applications (1)

Application Number Title Priority Date Filing Date
US387595A Expired - Lifetime US3904908A (en) 1972-08-11 1973-08-13 Manufacture of electrical devices having sealed envelopes

Country Status (8)

Country Link
US (1) US3904908A (de)
JP (1) JPS5612979B2 (de)
AT (1) AT343220B (de)
CA (1) CA983568A (de)
DE (1) DE2340931C3 (de)
GB (1) GB1430070A (de)
HU (1) HU171058B (de)
NL (1) NL169120C (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5245180A (en) * 1975-10-07 1977-04-09 Stanley Electric Co Ltd Method of manufacture of electric bulb
US4508514A (en) * 1983-09-19 1985-04-02 Gte Products Corporation Single-ended metal halide discharge lamp arc gap fabricating process
WO1988005599A1 (en) * 1987-01-22 1988-07-28 Fraunhofer-Gesellschaft Zur Förderung Der Angewand Process and device for improving the vacuum in a gas-tight container
US4997400A (en) * 1989-11-06 1991-03-05 Gte Products Corporation Method of aligning and gapping arc lamp electrodes
US5186669A (en) * 1990-02-01 1993-02-16 Cooper Industries, Inc. Incandescent lamp
WO1997049117A1 (de) * 1996-06-20 1997-12-24 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Abschattungsvorrichtung für eine kraftfahrzeugscheinwerferlampe und herstellungsverfahren für eine derartige abschattungsvorrichtung
US5850124A (en) * 1996-06-04 1998-12-15 Honda Giken Kogyo Kabushiki Kaisha Automobile lamp bulb with welded low beam shield
US6017258A (en) * 1996-11-06 2000-01-25 Sakurai; Yumiko Filament attaching method
EP1160821A2 (de) * 2000-05-30 2001-12-05 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Verfahren zur Beschriftung von Quarzglaslampen und damit hergestellte Quarzglaslampen
WO2003036684A1 (en) * 2001-10-23 2003-05-01 Federal-Mogul Corporation Incandescent halogen lamp having flattened filament support leads
US20100067247A1 (en) * 2006-12-21 2010-03-18 Frank Auer Shield device

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54137286U (de) * 1978-03-17 1979-09-22
JPS54143552U (de) * 1978-03-27 1979-10-05
JPS5760532Y2 (de) * 1979-04-17 1982-12-23
JPS58214269A (ja) * 1982-06-04 1983-12-13 松下電子工業株式会社 ヘツドライト用ハロゲン電球

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3768157A (en) * 1971-03-31 1973-10-30 Trw Inc Process of manufacture of semiconductor product
US3774064A (en) * 1970-04-16 1973-11-20 Thorn Electrical Ind Ltd Incandescent lamp filament supports
US3817591A (en) * 1968-04-11 1974-06-18 Lampes Elect Fab Reunies Method of manufacturing a lamp
US3827142A (en) * 1972-12-11 1974-08-06 Gti Corp Tuning of encapsulated precision resistor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3817591A (en) * 1968-04-11 1974-06-18 Lampes Elect Fab Reunies Method of manufacturing a lamp
US3774064A (en) * 1970-04-16 1973-11-20 Thorn Electrical Ind Ltd Incandescent lamp filament supports
US3768157A (en) * 1971-03-31 1973-10-30 Trw Inc Process of manufacture of semiconductor product
US3827142A (en) * 1972-12-11 1974-08-06 Gti Corp Tuning of encapsulated precision resistor

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5431317B2 (de) * 1975-10-07 1979-10-05
JPS5245180A (en) * 1975-10-07 1977-04-09 Stanley Electric Co Ltd Method of manufacture of electric bulb
US4508514A (en) * 1983-09-19 1985-04-02 Gte Products Corporation Single-ended metal halide discharge lamp arc gap fabricating process
WO1988005599A1 (en) * 1987-01-22 1988-07-28 Fraunhofer-Gesellschaft Zur Förderung Der Angewand Process and device for improving the vacuum in a gas-tight container
US4997400A (en) * 1989-11-06 1991-03-05 Gte Products Corporation Method of aligning and gapping arc lamp electrodes
US5186669A (en) * 1990-02-01 1993-02-16 Cooper Industries, Inc. Incandescent lamp
US5850124A (en) * 1996-06-04 1998-12-15 Honda Giken Kogyo Kabushiki Kaisha Automobile lamp bulb with welded low beam shield
CN1106672C (zh) * 1996-06-20 2003-04-23 电灯专利信托有限公司 机动车前灯的遮光装置及其制造方法
WO1997049117A1 (de) * 1996-06-20 1997-12-24 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Abschattungsvorrichtung für eine kraftfahrzeugscheinwerferlampe und herstellungsverfahren für eine derartige abschattungsvorrichtung
KR100292449B1 (ko) * 1996-06-20 2001-08-07 타실로 다우너 ; 랄프 프레준 ; 요아힘 베르너 자동차전조등용차폐장치및상기장치의제조방법
US6017258A (en) * 1996-11-06 2000-01-25 Sakurai; Yumiko Filament attaching method
EP1160821A2 (de) * 2000-05-30 2001-12-05 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Verfahren zur Beschriftung von Quarzglaslampen und damit hergestellte Quarzglaslampen
EP1160821A3 (de) * 2000-05-30 2004-09-29 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Verfahren zur Beschriftung von Quarzglaslampen und damit hergestellte Quarzglaslampen
WO2003036684A1 (en) * 2001-10-23 2003-05-01 Federal-Mogul Corporation Incandescent halogen lamp having flattened filament support leads
US6856090B2 (en) * 2001-10-23 2005-02-15 Federal-Mogul Worldwide, Inc. Incandescent halogen lamp having flattened filament support leads
US20100067247A1 (en) * 2006-12-21 2010-03-18 Frank Auer Shield device

Also Published As

Publication number Publication date
CA983568A (en) 1976-02-10
DE2340931B2 (de) 1978-04-13
NL169120C (nl) 1982-06-01
NL7311111A (de) 1974-02-13
HU171058B (hu) 1977-10-28
DE2340931A1 (de) 1974-02-28
JPS5612979B2 (de) 1981-03-25
NL169120B (nl) 1982-01-04
JPS4992879A (de) 1974-09-04
AT343220B (de) 1978-05-10
DE2340931C3 (de) 1978-12-14
GB1430070A (en) 1976-03-31
ATA705673A (de) 1977-09-15

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