EP0229429B1 - Elektrische Lampe und Verfahren zur Herstellung dieser Lampe - Google Patents

Elektrische Lampe und Verfahren zur Herstellung dieser Lampe Download PDF

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Publication number
EP0229429B1
EP0229429B1 EP19860202354 EP86202354A EP0229429B1 EP 0229429 B1 EP0229429 B1 EP 0229429B1 EP 19860202354 EP19860202354 EP 19860202354 EP 86202354 A EP86202354 A EP 86202354A EP 0229429 B1 EP0229429 B1 EP 0229429B1
Authority
EP
European Patent Office
Prior art keywords
lamp
end portion
vessel
synthetic resin
lamp vessel
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
EP19860202354
Other languages
English (en)
French (fr)
Other versions
EP0229429A3 (en
EP0229429A2 (de
Inventor
Livio Borgis
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 IT67018/86A external-priority patent/IT1187847B/it
Application filed by Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Gloeilampenfabrieken NV
Publication of EP0229429A2 publication Critical patent/EP0229429A2/de
Publication of EP0229429A3 publication Critical patent/EP0229429A3/en
Application granted granted Critical
Publication of EP0229429B1 publication Critical patent/EP0229429B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01J5/50—Means forming part of the tube or lamps for the purpose of providing electrical connection to it
    • H01J5/54—Means forming part of the tube or lamps for the purpose of providing electrical connection to it supported by a separate part, e.g. base
    • H01J5/58—Means for fastening the separate part to the vessel, e.g. by cement
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/42—Means forming part of the lamp for the purpose of providing electrical connection, or support for, the lamp
    • H01K1/46—Means forming part of the lamp for the purpose of providing electrical connection, or support for, the lamp supported by a separate part, e.g. base, cap

Definitions

  • the invention relates to an electric lamp provided with:
  • the lamp cap is fixed to the lamp vessel by means of a synthetic resin, for example a thermoplastic synthetic resin of the kind of which in this known lamp the lamp cap consists, i.e. a polysulphone or a polyketone.
  • a synthetic resin for example a thermoplastic synthetic resin of the kind of which in this known lamp the lamp cap consists, i.e. a polysulphone or a polyketone.
  • a ring of this polymer is arranged to surround the end portion of the lamp vessel and is caused to melt. Subsequently, the lamp cap is provided and a butt joint is obtained between the lamp vessel and the lamp cap by cooling the assembly.
  • the invention has for its object to provide an electric lamp of the kind mentioned in the opening paragraph which can readily be manufactured and of which the connection between the lamp vessel and the lamp cap has an improved torsional strength.
  • this object is achieved in an electric lamp of the kind mentioned in the opening paragraph in that polyetherimide is used as the thermoplastic synthetic resin.
  • the synthetic resin connects in radial directions, i.e. directions transverse to the axis of the lamp vessel, the end portion of the lamp vessel to the lamp cap.
  • This embodiment is advantageous because in this case there is a comparatively large surface of application for the synthetic resin both to the lamp vessel and to the lamp cap. Moreover, size differences in these components are then more readily neutralized and the lamp cap can be more readily positioned correctly coaxially to the lamp vessel.
  • the lamp vessel, the synthetic resin and the lamp cap are then arranged substantially coaxially.
  • the torsional strength of the connection between the lamp vessel and the lamp cap is even considerably larger if the end portion of the lamp vessel has a projection which extends transversely to the axis of the lamp vessel and projects into the synthetic resin.
  • a projection neutralizes shearing forces in the interface between the lamp vessel and the synthetic resin.
  • the uniformity of the forces in this interface is large if several, for example two or more, of such projections are distributed along the circumference of the end portion.
  • Such projections are readily obtained during the operation in which the end portion of the lamp vessel is shaped. This operation is a normal step in the manufacture of conventional lamps of which the lamp vessel is fixed in the lamp cap by means of cement.
  • the end portion of the lamp vessel is unround in a different manner, i.e. is non-circular in cross-sections transverse to the axis of the lamp vessel.
  • the end portion may be, for example, oval in cross-sections or may have one or more depressions, for example transversal or axial grooves, in which the thermoplastic synthetic resin has adhered and which are filled with this synthetic resin.
  • the projections mentioned in the preceding paragraph have a particular advantage, however, which will be mentioned hereinafter.
  • the adhesion of the synthetic resin to the material of the lamp cap is generally stronger than to glass of the lamp vessel. Nevertheless, the inner surface of the lamp cap where it is in contact with the synthetic resin can be profiled to enlarge the application of the synthetic resin thereto. A good possibility is to use for this purpose an inwardly depressed metal lamp cap. The depression(s) is (are) then at least tangentially enclosed in the synthetic resin.
  • a current supply conductor to the light source is clamped between the synthetic resin and the sheath of the lamp cap.
  • lamp caps having a metal sheath it has surprisingly been found that a good electrical contact between this sheath and this conductor is obtained.
  • Swan-s lamp caps i.e. Swan lamp caps having only one contact at the base portion and one contact at the sheath, and with Edison lamp caps to connect the contact at the sheath of the lamp cap to a current supply conductor without using a soldering or welding operation.
  • polyetherimides such as polyetherimides marketed under the tradename Ultem by General Electric Plastics and having the structure of a repeating unit shown in Figure 6 of the drawings.
  • the polyetherimides may have a filling of mineral powders, such as SiO2, CaCO3, MgO, ZnO, BaSO4, Al2O3, but alternatively of fibres, such as glass fibres.
  • the lamp according to the invention may be one of several kinds, for example an incandescent lamp, in which the light source is a filament.
  • the filament may be surrounded by an inner bulb which is arranged in the lamp vessel.
  • the lamp may alternatively be a discharge lamp, for example a low-pressure discharge lamp, such as a low-pressure mercury discharge lamp.
  • the light source is in this case an ionizable mercury-containing gas with electrodes that may be arranged in the lamp vessel. Inside the lamp vessel, the gas filling may be present in an inner bulb, such as in a low-pressure sodium discharge lamp.
  • the lamp may alternatively be a high-pressure discharge lamp, such as a high-pressure sodium discharge lamp, which emits at least substantially white light.
  • the light source is in this case a sodium-containing ionizable gas in a crystalline inner bulb provided with electrodes.
  • the lamp according to the invention can be very readily manufactured. It has proved to be favourable to arrange a preformed ring of polyetherimide around the hot end portion of the lamp vessel. It is favourable to carry out this step while this end portion is still hot, for example has a temperature of 400 - 450°C due to the operation in which this portion is shaped.
  • the ring is brought to an elevated temperature, for example 150 - 200°C.
  • the ring adheres, when it is provided, to the hot surface of the end portion.
  • the ring around the end portion may then be shaped by means of a jig.
  • the jig may have an elevated temperature, for example of 150 - 200°C. Subsequently, the lamp cap is provided.
  • the lamp cap is heated for this purpose at a temperature of about 400 - 450°C.
  • the temperatures are not critical.
  • the synthetic material rapidly softens and adheres.
  • the ring retains its shape and does not adhere to objects with which it is in contact. On adhesion to objects of about 400°C, a connection is obtained which becomes stronger upon cooling.
  • the ring of synthetic resin has in a favourable embodiment a conical shape, for example with an apic angle of 2 x 5°. This shape facilitates the step of providing the ring around the end portion of the lamp vessel.
  • the lamp vessel is moreover conical at the free end of its end portion, because glass mouldings cannot be made with sharp shapes.
  • One or more projections at the end portion of the lamp vessel are particularly favourable means for enlarging the grip of the synthetic resin on the lamp vessel.
  • the ring of synthetic resin can then have at its inner surface one or more grooves, which are caused to engage these projections.
  • a ring having a smaller wall thickness can be used whilst maintaining its enlarged grip if this ring has at its wide end one or more recesses with which the ring laterally engages a projection.
  • EP-A-0 186 827 discloses a lamp of pressed glass whose lamp cap is connected via a skirt of synthetic resin to the bottom of the lamp vessel.
  • the sleeve then replaces a metal collar and a glass body through which in conventional lamps of pressed glass the bottom of the lamp vessel is connected to the lamp cap.
  • the skirt of synthetic resin has a wide collar portion with longitudinal slots and internal nose-shaped projections, which under elastic deformation of the collar portion are caused to engage cavities in the bottom of the lamp vessel. As a result, a mechanical coupling is obtained between the lamp vessel and the skirt.
  • the skirt At its outer surface the skirt has parts of screw-thread onto which the Edison lamp cap is screwed, while it further has in its outer surface recesses in which the lamp cap is depressed in order to lock the screw connection between the skirt and the lamp cap against displacement.
  • the skirt is consequently secured mechanically both to the lamp vessel and to the lamp cap.
  • the skirt is more than a means for coupling the lamp vessel to the lamp cap. It is an insulator body between the lamp vessel and the lamp cap and a body which causes the length of the lamp to be considerably greater than in the case of a direct connection of the lamp cap to the lamp vessel.
  • To the synthetic resin that can be used for the sleeve belong polyetherimides.
  • the lamp of Figure 1 has a translucent glass lamp vessel 1 having an axis 2 and an end portion 3.
  • a filament 4 serving as the light source is arranged in the lamp vessel 1.
  • the lamp cap 5 which has a sheath portion 6 and base portion 7, the end portion 3 of the lamp vessel 1 is fixed by means of a thermoplastic synthetic resin 8 in that the latter has adhered both to the lamp vessel and to the lamp cap.
  • the lamp cap 5 has an electrical contact at the sheath 6 to which a current supply conductor 11 to the light source 4 is connected.
  • a base contact 9 at the base portion 7 is connected to a second current supply conductor 12 to the light source 4.
  • thermoplastic synthetic resin use is made of polyetherimide containing 30% by weight of glass fibre.
  • the synthetic resin 8 connects the end portion 3 of the lamp vessel 1 in directions transverse to the axis 2 of the lamp vessel 1 to this lamp vessel.
  • the synthetic resin 8 and the lamp cap 5 consequently surround the end portion 3 and the synthetic resin 8, respectively, substantially coaxially.
  • the end portion 3 has a non-circular cross-section transverse to the axis 2 of the lamp vessel 1 in which the end portion 3 is in contact with the synthetic resin.
  • this non-circularity is due to a projection 10 which extends transversely to the axis 2 and projects into the synthetic resin 8 ( Figure 5).
  • the end portion 3 has diametrically opposite to the projection 10 a second similar projection (14 in Figure 3).
  • the projections 10, 14 are consequently distributed regularly along the circumference.
  • the current supply conductor 11 is in electrical contact with the lamp cap 5 on the inner side of this lamp cap due to the fact that this conductor 11 is clamped between the synthetic resin 8 and the sheath portion 6 of the lamp cap 5.
  • Figure 2 shows a conical ring 8 of the thermoplastic synthetic resin, whose wide end is provided with two diametrically opposed recesses 13.
  • the lamp vessel 1 is rotated through 180° with respect to Figure 1 and is held in position by a holder 20.
  • the end portion 3 has a temperature of 400 to 450°C due to a shaping and cleaning process, at the end of which the lamp vessel 1 was sealed in a vacuum-tight manner by closing the exhaust tube 15.
  • a thermoplastic ring 8 heated at about 150 - 200°C is situated in a holder 21 accommodating heating elements 22.
  • the holders 20, 21 are moved towards each other and the ring 8 is pressed on the end portion 3, the ring melting at its inner surface and adhering to the end portion 3.
  • the recesses 13 in the ring 8 then engage the projections 10, 14.
  • the ring consequently has a profile cooperating with the non-circular cross-section of said end portion 3. Similar recesses could be present at the narrow end of the ring 8 in order to cooperate with depressions that can be present in the lamp cap 5.
  • a holder 24 ( Figure 5) with a lamp cap 5 shown diagrammatically, which is heated by means of, for example, a flame to a temperature of about 400 to 450°C, is pressed on the ring 8, this ring melting at its outer surface and adhering to the sheath portion 6 of the lamp cap 5.
  • the connection of the base contact 9 with the current supply conductor 12 can be made and the lamp may be cooled by means of an air jet.
  • the current supply conductor may be shortened before the ring 8 is applied in Figure 3.

Landscapes

  • Common Detailed Techniques For Electron Tubes Or Discharge Tubes (AREA)
  • Fastening Of Light Sources Or Lamp Holders (AREA)

Claims (11)

  1. Elektrische Lampe mit:
    - einem lichtdurchlässigen Lampenkolben (1) mit einer Achse (2) und einem Endteil (3),
    - einer Lichtquelle (4) im Lampenkolben (1),
    - einem Lampensockel (5) mit einem Hüllenteil (6) und einem Basisteil (7), in dem der Endteil (3) des Lampenkolbens (1) mittels eines thermoplastischen Kunstharzes (8) festgesetzt ist, daß dieser Kunstharz sowohl am Lampenkolben (1) als auch am Lampensockel (5) haftet, wobei der Lampensockel (5) einen elektrische Kontakt aufweist, an den ein Stromversorgungsleiter (11) nach der Lichtquelle (4) angeschlossen ist,
    dadurch gekennzeichnet, daß Polyätherimid als der erwähnte thermoplastische Kunstharz verwendet wird.
  2. Elektrische Lampe nach Anspruch 1,
    dadurch gekennzeichnet, daß der Kunstharz (8) in Richtungen quer zur Achse (2) des Lampenkolbens (1) den Endteil des Lampenkolbens mit dem Lampensockel verbindet.
  3. Elektrische Lampe nach Anspruch 2,
    dadurch gekennzeichnet, daß der Endteil des Lampenkolbens, an der Stelle, an der er mit dem Kunstharz in Kontakt steht, einen nichtkreisförmigen Querschnitt quer zur Achse des Lampenkolbens aufweist.
  4. Elektrische Lampe nach Anspruch 3,
    dadurch gekennzeichnet, daß der Endteil (3) des Lampenkolbens (1) einen Vorsprung (10) aufweist, der sich quer zur Achse (2) des Lampenkolbens erstreckt und in den Kunstharz (8) hineinragt.
  5. Elektrische Lampe nach Anspruch 4,
    dadurch gekennzeichnet, daß der Lampenkolben mehrere derartiger Vorsprünge (10, 14) in einer Verteilung auf dem Umfang des Endteils (3) besitzt.
  6. Elektrische Lampe nach Anspruch 2, 3, 4 oder 5,
    dadurch gekennzeichnet, daß der Stromversorgungsleiter (11) nach der Lichtquelle mit dem Hüllenteil (6) des Lampenkolbens elektrisch verbunden und dieser Leiter (11) zwischen dem Kunstharz (8) und dem Hüllenteil (6) des Lampensockels eingeklemmt ist.
  7. Herstellungsverfahren einer elektrischen Lampe nach Anspruch 1,
    dadurch gekennzeichnet, daß ein Polyätherimidring (8) zum Umgeben eines Endteils des Lampenkolbens (1) mit einer Temperatur von etwa 400 ... 450°C angeordnet wird, und daß ein Lampensockel (5) mit einer Temperatur von etwa 400 ... 450°C zum Umgeben des Polyätherimids angeordnet wird.
  8. Verfahren nach Anspruch 7,
    dadurch gekennzeichnet, daß der Ring bei einer Temperatur von etwa 150 ... 200°C angebracht wird.
  9. Verfahren nach Anspruch 7 oder 8,
    dadurch gekennzeichnet, daß der Polyätherimidring konisch ist.
  10. Verfahren nach Anspruch 9,
    dadurch gekennzeichnet, daß der Lampenkolben einen Endteil aufweist, der nicht kreisförmige Querschnitte an den Stellen aufweist, an denen er mit dem Ring in Kontakt gebracht wird, und daß der Ring ein damit zusammenarbeitendes Profil besitzt.
  11. Verfahren nach Anspruch 10,
    dadurch gekennzeichnet, daß der Endteil (3) wenigstens einen Vorsprung (10, 14) aufweist, der sich quer zur Achse des Lampenkolbens erstreckt, und daß der Ring wenigstens eine Ausnehmung (13) für diesen Vorsprung aufweist.
EP19860202354 1986-01-10 1986-12-22 Elektrische Lampe und Verfahren zur Herstellung dieser Lampe Expired - Lifetime EP0229429B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
IT67018/86A IT1187847B (it) 1986-01-10 1986-01-10 Procedimento ed apparecchiatura per il montaggio di lampade e prodotti similari particolarmente lampade ad incandescenza
IT6701886 1986-01-10
NL8602929 1986-11-19
NL8602929 1986-11-19

Publications (3)

Publication Number Publication Date
EP0229429A2 EP0229429A2 (de) 1987-07-22
EP0229429A3 EP0229429A3 (en) 1989-08-30
EP0229429B1 true EP0229429B1 (de) 1993-04-21

Family

ID=26329690

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860202354 Expired - Lifetime EP0229429B1 (de) 1986-01-10 1986-12-22 Elektrische Lampe und Verfahren zur Herstellung dieser Lampe

Country Status (3)

Country Link
EP (1) EP0229429B1 (de)
CN (1) CN1008573B (de)
DE (1) DE3688319T2 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7270453B2 (en) 2004-12-21 2007-09-18 General Electric Company Heat resistant plastic lamp components and methods of forming

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2965920B2 (ja) * 1996-12-06 1999-10-18 スタンレー電気株式会社 片端子型放電ランプ
US6815878B2 (en) 2002-03-21 2004-11-09 Federal-Mogul World Wide, Inc. High temperature lamp

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3047765A (en) * 1959-08-20 1962-07-31 Gen Electric Base assembly for electric lamps
BE793264A (fr) * 1971-12-22 1973-06-22 Ici Ltd Appareil electrique
GB8400259D0 (en) * 1984-01-06 1984-02-08 Gen Electric Co Plc Electric lamp and cap

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7270453B2 (en) 2004-12-21 2007-09-18 General Electric Company Heat resistant plastic lamp components and methods of forming

Also Published As

Publication number Publication date
EP0229429A3 (en) 1989-08-30
CN87100126A (zh) 1987-08-12
EP0229429A2 (de) 1987-07-22
CN1008573B (zh) 1990-06-27
DE3688319T2 (de) 1993-10-21
DE3688319D1 (de) 1993-05-27

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