EP0262736A2 - Stromzuführungshalter für Entladungskolben - Google Patents

Stromzuführungshalter für Entladungskolben Download PDF

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Publication number
EP0262736A2
EP0262736A2 EP87201853A EP87201853A EP0262736A2 EP 0262736 A2 EP0262736 A2 EP 0262736A2 EP 87201853 A EP87201853 A EP 87201853A EP 87201853 A EP87201853 A EP 87201853A EP 0262736 A2 EP0262736 A2 EP 0262736A2
Authority
EP
European Patent Office
Prior art keywords
lamp
wire
lead
discharge vessel
opening
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Withdrawn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
EP87201853A
Other languages
English (en)
French (fr)
Other versions
EP0262736A3 (de
Inventor
John Paul Dunn
Kent Lewis Collins
Norman Randal King
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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
Priority claimed from US06/912,451 external-priority patent/US4708679A/en
Priority claimed from US06/912,452 external-priority patent/US4774431A/en
Application filed by Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Gloeilampenfabrieken NV
Publication of EP0262736A2 publication Critical patent/EP0262736A2/de
Publication of EP0262736A3 publication Critical patent/EP0262736A3/de
Withdrawn legal-status Critical Current

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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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/36—Seals between parts of vessels; Seals for leading-in conductors; Leading-in conductors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/82—Lamps with high-pressure unconstricted discharge having a cold pressure > 400 Torr

Definitions

  • the invention relates to a high-pressure dis­charge lamp including a ceramic discharge vessel having at one end a hollow cylindrical lead-through element as a part of an electrode construction having on the side remote from the discharge vessel an opening of defined substantially circular cross-section, in which a wire-­shaped supporting member is arranged.
  • ceramic discharge vessel is to be understood in this description and the appended Claims to mean a discharge vessel having a wall of crystalline oxidic material containing at least aluminium oxide. This may be, for example, monocrystalline sapphire. Other possibilities are for instance densely sintered polycrys­talline aluminium oxide or yttrium-aluminium-garnet.
  • the lead-through element is generally connected by means of a melting glass connection in a gas-tight manner at the end to the discharge vessel. It is common practice that the lead-through member is made of niobium because this material has an expansion coefficient which differs comparatively slightly from that of aluminium oxide. However, molybdenum has also been suggested.
  • the lead-through member will generally be provided with means for positioning the lead-through element in the end of the discharge vessel before a gas-tight melting glass connection is established. These positioning means can consist of one or more local deformations of at least the outer surface of the lead-through element. A large number of variations is known from literature.
  • Wire-shaped supporting elements are generally obtained by cutting, clipping or mechanically severing in another manner lengths of wire of prescribed length from a supply. In this case, burrs are formed. Such burrs may lead to damage of the lead-through element.
  • wire-shaped supporting elements is very advantageous with a view to material consumption and is particularly suitable for comparatively simple automized mass production.
  • the invention has for its object to provide a measure which, whilst maintaining a favourable material consumption and the possibility of the use of simple and automatized mass production, results in a more rigid lamp construction.
  • a lamp of the kind mentioned in the opening paragraph is characterized in that the wire-shaped supporting element is provided, at least as far as it is located within the hollow lead-through element, with a plastically deformed part having a largest outer dimension substantially equal to the defined cross-section of the opening.
  • An advantage of the invention is that the amount of clearance between the lead-through element and the supporting element is limited, as a result of which the possibility of damage of the lead-through element by a burr of the wire-shaped supporting element is also limited.
  • a further advantage is that in this manner the wire-shaped supporting member can serve for centering the discharge vessel. This is favourable especially with the use in reflector luminaires.
  • Plastic deformation of metal wire can generally be realized in mass production.
  • the plas­tically deformed part of the wire-shaped supporting element is formed as a coiled wire.
  • the plastically deformed part of the wire-­shaped supporting element is formed as a flattened wire.
  • Coiled wire and flattened wire are both wire shapes which can be realized very well by means of a simple reproducible mass production. Especially in the case of a flattened wire, the absence of a burr can also be ensured due to the fact that the end of the length of wire is flattened. Damage of the lead-through element due to a burr is then not possible.
  • a further improvement of the lamp construction can be attained in that the flattened wire part consists of two portions, which are arranged substantially at right angles to each other.
  • the Japanese Patent laid open Publication 61-118955 (1986) discloses, it is true, a construction of a supporting element having a rectangular cross-section at the area at which it is passed into the hollow lead-­through element.
  • a beam-shaped element is used as a supporting element, which conflicts with advantageous material consumption, while on the other hand the lead-through element is deformed at the area of the supporting element in such a manner that it encloses the supporting element. This requires a particular treat­ment of the lead-through element.
  • a lamp according to the invention is provided with two ends each provided with a hollow cylindrical lead-through element, which is provided on the side remote from the discharge vessel with an opening of defined substantially circular cross-section, in which a wire-shaped supporting element is arranged, which is provided, at least as far as it is located within the relevant lead-through element, with a plastically deformed part having a largest outer dimension substantially equal to the defined cross-section of the opening. Due to the fact that the lamp is provided with a similar construction on either side of the discharge vessel, the manufacture is comparatively simple and a rigid lamp construction can be realized.
  • a further improvement with respect to the rigidity of the lamp construction can be realized in the case in which the flattened wire portions of each of the supporting elements are arranged substantially at right angles to each other.
  • a discharge vessel in the form of an arc tube 11 having electrode structures 13 and 15 at each of its ends.
  • these structures include as hollow cylindrical lead-through elements niobium tubes 17 and 19 and electrodes 21 and 23.
  • the support means for arc tube 11 includes support wires 25 and 27 each having a prescribed length which could be different for each wire depending on the lamp design. Wires 25 and 27 are depicted as two separate wires but could be two ends of a single prescribed length of support wire which would later be cut in two.
  • the niobium tubes 17 and 19 are each provided on the side remote from the arc tube with an opening having a defined substantially circular cross-section.
  • the ends of support wires 25 and 27 which are inserted in the open ends of niobium tubes 17 and 19 are plastically deformed to coiled portions 29 and 31 in order to form expanded parts whose external dimensions nearly equal the internal dimension of the niobium tubes.
  • the expanded parts can provide centerline alignment between the discharge vessel and the support wires. They also provide more lateral support than wires 25 and 27 would provide without expanded parts.
  • Figure 2 shows an arrangement similar to Figure 1. Instead of coiling the ends of support wires 25 and 27 to form coiled portions 29 and 31 as in Figure 1, however, the ends of support wires 25 and 27 are plastically deformed by flattening to form flat portions 33 and 35. It is to be understood that the edges of flat portions 33 and 35 are so disposed that they are at approximately right angles to each other which favours the rigidity of the lamp construction.
  • FIG 3 shows the presently preferred embodiment of the invention.
  • flat portions 33 and 35 of the arrangement of Figure 2 are replaced by dual flattened end portions 37 and 39.
  • each of these axial sections comprises two flattened portions 41 and 43 with rounded edges disposed at approximately right angles to each other.
  • Flattened portions 41 and 43 are readily provided at the ends of wires 25 and 27 by crimping the ends of these wires as desired. It is contemplated that more than two flattened portions could be provided at the ends of each of wires 25 and 27. If so these might be arranged at different angles from the 90° angle shown in Figures 4a and 4b.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
EP87201853A 1986-09-29 1987-09-28 Stromzuführungshalter für Entladungskolben Withdrawn EP0262736A3 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US06/912,451 US4708679A (en) 1986-09-29 1986-09-29 Method of making support means for discharge lamp tubes
US06/912,452 US4774431A (en) 1986-09-29 1986-09-29 Arc tube wire support
US912451 1986-09-29
US912452 1986-09-29

Publications (2)

Publication Number Publication Date
EP0262736A2 true EP0262736A2 (de) 1988-04-06
EP0262736A3 EP0262736A3 (de) 1990-03-14

Family

ID=27129603

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87201853A Withdrawn EP0262736A3 (de) 1986-09-29 1987-09-28 Stromzuführungshalter für Entladungskolben

Country Status (3)

Country Link
EP (1) EP0262736A3 (de)
CN (1) CN1009407B (de)
HU (1) HU196531B (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1557527A (de) * 1967-03-31 1969-02-14
EP0052844A1 (de) * 1980-11-21 1982-06-02 GTE Laboratories Incorporated Vakuumdichte Anordnung
EP0074720A2 (de) * 1981-09-15 1983-03-23 THORN EMI plc Entladungslampe
GB2129609A (en) * 1982-11-02 1984-05-16 Heraeus Gmbh W C Electrodes for laser exciter lamps
EP0126503A1 (de) * 1983-04-22 1984-11-28 Koninklijke Philips Electronics N.V. Hochdruckentladungslampe

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1557527A (de) * 1967-03-31 1969-02-14
EP0052844A1 (de) * 1980-11-21 1982-06-02 GTE Laboratories Incorporated Vakuumdichte Anordnung
EP0074720A2 (de) * 1981-09-15 1983-03-23 THORN EMI plc Entladungslampe
GB2129609A (en) * 1982-11-02 1984-05-16 Heraeus Gmbh W C Electrodes for laser exciter lamps
EP0126503A1 (de) * 1983-04-22 1984-11-28 Koninklijke Philips Electronics N.V. Hochdruckentladungslampe

Also Published As

Publication number Publication date
CN87106683A (zh) 1988-04-06
HUT45170A (en) 1988-05-30
CN1009407B (zh) 1990-08-29
EP0262736A3 (de) 1990-03-14
HU196531B (en) 1988-11-28

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Inventor name: COLLINS, KENT LEWIS

Inventor name: DUNN, JOHN PAUL

Inventor name: KING, NORMAN RANDAL