EP0704101A1 - Ensemble de fixation d'ampoule pour lampe a decharge sans electrode - Google Patents

Ensemble de fixation d'ampoule pour lampe a decharge sans electrode

Info

Publication number
EP0704101A1
EP0704101A1 EP95914456A EP95914456A EP0704101A1 EP 0704101 A1 EP0704101 A1 EP 0704101A1 EP 95914456 A EP95914456 A EP 95914456A EP 95914456 A EP95914456 A EP 95914456A EP 0704101 A1 EP0704101 A1 EP 0704101A1
Authority
EP
European Patent Office
Prior art keywords
lamp
arms
lamp base
envelope
base
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.)
Granted
Application number
EP95914456A
Other languages
German (de)
English (en)
Other versions
EP0704101B1 (fr
Inventor
Allan Gould
Kenneth Downton
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.)
GE Lighting Ltd
Original Assignee
GE Lighting 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 GE Lighting Ltd filed Critical GE Lighting Ltd
Publication of EP0704101A1 publication Critical patent/EP0704101A1/fr
Application granted granted Critical
Publication of EP0704101B1 publication Critical patent/EP0704101B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • H01J5/60—Means for fastening the separate part to the vessel, e.g. by cement for fastening by mechanical means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J65/00—Lamps without any electrode inside the vessel; Lamps with at least one main electrode outside the vessel
    • H01J65/04—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels
    • H01J65/042—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels by an external electromagnetic field
    • H01J65/048—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels by an external electromagnetic field the field being produced by using an excitation coil

Definitions

  • the present invention relates to an arrangement for mounting the lamp envelope portion of an electrodeless discharge lamp to the base portion of such lamp and more particularly, to such a mounting arrangement as provides for a complete mechanical failure in the event of damage to the lamp as can occur for instance by mishandling.
  • Electrodeless discharge lamps are expected to become increasingly popular for home, industrial and commercial uses because of the obvious advantages of energy efficiency and long life over the standard incandescent and even other compact fluorescent products which are electroded.
  • an ionizable medium is excited to a discharge state by introduction of an radio frequency (RF) signal and light is produced from such discharge by use of a suitable phosphor.
  • RF radio frequency
  • An example of such a lamp can be found in US Patent No.4,010,400 wherein it is disclosed that an electric field generated by the RF signal initiates the ionization that produces visible light output whereas a magnetic field then sustains ionization for continuous lamp operation.
  • the lamp envelope in this instance is shown in the shape of a typical A-line incandescent lamp having a central cavity through which a coil member is disposed, such coil member being effective for coupling the RF signal to the ionizable medium.
  • the lamp envelope is then shown being mounted on a base member in which a ballast circuit effective for generating the RF signal is disposed.
  • some form of adhesive could be used to both secure the envelope to the base and to provided a seal therebetween.
  • the problem with such a mounting arrangement particularly with a potentially long lasting lamp such as the electrodeless discharge lamp is that the adhesive has a potential for degradation at a joint where safety is a critical factor.
  • a mounting arrangement for mounting a lamp envelope to a lamp base could be provided for use with an electrodeless discharge lamp wherein such mounting arrangement would not be subject to degradation over time and wouldjnsu ⁇ e that upon damage to the lamp as may occur by mishandling for instance, the lamp is definitely disabled before it could be separated from the lamp base.
  • a mounting arrangement for mounting a lamp envelope to a lamp base which includes a mounting member having a center support portion and a plurality of arms extending outwardly therefrom.
  • the plurality of arms may have formed thereon, at least two curved portions, the first of which is effective for contacting a ridge portion of the lamp base and thereby securing the mounting member to the lamp base.
  • the second curved portion of each of the arms contacts an indention portion formed at the lower region of the lamp envelope which fits into the lamp base, the second curved portion of the plurality of arms contacting such indention portions in a manner to secure the lamp envelope to the mounting member which is secured to the lamp by virtue of the first curved portion contacting the ridge portion of the lamp base.
  • the mounting member having an outer circular ring portion which contacts the ridge portion of the lamp base to secure the mounting member to the lamp base.
  • the plurality of arms need only include a single curved portion for contacting the indention portion of the lamp envelope and thereby securing the lamp envelope to the mounting member which has been secured to the lamp base by way of the circular ring portion contacting the ridge portion of the lamp base. It is also possible to provide bent or offset arms in cooperation with the central ring portion.
  • FIG. 1 is a sectional view of an electrodeless discharge lamp constructed in accordance with the teachings of the prior art.
  • Figure 2 is an elevational view in section of a lamp envelope and lamp base configuration for an electrodeless discharge lamp constructed in accordance with the principles of the present invention.
  • Figure 3 is an elevational view of a bulb clip device used in conjunction with the lamp envelope and lamp base configuration shown in Fig. 2.
  • FIG 4 is an elevational view of another bulb clip device used in conjunction with an alternate lamp envelope and lamp base configuration constructed in accordance with the principles of an alternate embodiment of the present invention.
  • FIG. 5 is an elevational view in section of yet another bulb clip arrangement constructed in accordance with the principles of the present invention.
  • FIG. 6 is an elevational view in section of still another bulb clip arrangement constructed in accordance with the principles of the present invention. DETAILED DESCRIPTION OF THE INVENTION
  • an electrodeless fluorescent lamp 10 includes a lamp base portion 12 and a lamp envelope portion 14. When finally assembled, the lamp; 10 can resemble a conventional A-line incandescent lamp, or it can be shaped as a reflector lamp as shown in Figure 1.
  • the base portion 12 is constructed having a conventional edison type threaded base 13 capable of easy installation in a conventional light socket typically used in conjunction with a standard incandescent lamp.
  • a housing portion 22 is formed adjacent the threaded base 12a and serves to contain the ballast circuit 24 which receives the line power and converts such line power into an operating signal capable of driving the electrodeless lamp 10 to a discharge state.
  • a core member 20 which extends from the housing portion 22 is made of a magnetizable material and has wound thereon, an excitation coil 18.
  • the excitation coil 18 is effective in conjunction with a capacitor (not shown) disposed within the housing portion 22, for forming a resonant circuit which receives the operating signal from the ballast circuit 24 and develops the RF signal therefrom.
  • the RF signal is then inductively coupled to a gas fill contained within the lamp envelope 14 so as to initiate and maintain the gas discharge 23 within the lamp envelope 14.
  • the inner surface of the lamp envelope 14 is coated with appropriate fluorescent materials shown generally as reference 21, such fluorescent materials being selected from a group of known materials and applied to the inner surface in a known manner.
  • the molecules which make up the gas fill are ionized first by an electric field generated by the RF signal and thereafter maintained in such discharge state by a magnetic field also produced by the RF signal.
  • the resulting gas discharge is then used to produce visible light by the known principles of fluorescent lighting.
  • the prior electrodeless fluorescent lamps as shown in U.S. 4,010,400 provide no direction regarding the manufacture of such a lamp nor specific teachings regarding certain safety features of the lamp.
  • the manner of attaching the lamp envelope to the lamp base merely shows a lower tapered portion of the lamp envelope 14 fitting into a lip region associated with the lamp base.
  • the present invention provides an arrangement which mechanically secures the lamp envelope 14 to the lamp base 12 so as to provide an expected life at least as long as the lamp 10.
  • the present invention also provides an added safety feature in that, should the lamp envelope 14 be subjected to excessive forces by mishandling for instance, the lamp securing arrangement as will be described with reference to Fig. 2, will operate to disable operation of the lamp 10.
  • the electrodeless fluorescent lamp; 10 of the present invention further includes a re-entrant cavity portion 15 of the lamp envelope 14.
  • the core member 20 extends into the re-entrant cavity 15.
  • An exhaust tube 16 extends through the center of the re-entrant cavity 15.
  • an electrodeless fluorescent lamp 10 constructed in accordance with the present invention incorporates the safety feature which provides for the lamp shutdown in the event of an excessive force being exerted on the lamp envelope and further, which addresses the above discussed life expectancy problem related to the envelope, base securing arrangement.
  • Electrodeless fluorescent lamp 10 provides that the lamp base member 12 and a lamp envelope 14 which are cooperatively interlocked by means of a bulb clip member 36 as will be more fully described with reference to Figs. 3 through 6. With the ballast circuit components disposed within the lower portion of the base member 12, the bulb clip member 36 will reside within the top portion of the lamp base 12 as depicted in Fig. 2. At the upper end of the bulb clip member 36, a plurality of arm ends 44a ( see Fig.
  • the bulb clip member 36 is prevented from being pulled away from the lamp base 12 and, as will be described hereinafter in further detail, further prevents the pulling out of the lamp envelope 14 from the lamp base 12.
  • the lip portion 12a prevents movement of the bulb clip member 36 and the lamp envelope 14 out of the lamp base 12, it can be appreciated that such lip portion 12a may not prevent the bulb clip member 36 from dislocating to a position further within the lamp base member 12.
  • the bulb clip member 36 has a central opening 40 through which the core member 20 and the excitation coil 18 extend into the re-entrant cavity 15 of the lamp envelope 14. Additionally, the bulb clip member 36 includes a plurality of curved portions 42 which are effective for retaining a flared end portion 14a of the lamp envelope 14.
  • the flared end region 14a of the lamp envelope 14 can be formed in a continuous annular manner or, in the alternative, can include at least one stop portion (not shown) formed along the surface of the lamp envelope 14. This stop portion can be effective for engaging a side portion of one of the arm extensions 44a of the bulb clip member 36 thus preventing the rotation of the lamp envelope 14 relative to the bulb clip member 36 or the lamp base 12.
  • the securing arrangement between the lamp envelope 14 and the lamp base 12 is one that, should an excessive force be exerted on the lamp envelope 14, a lamp shutdown will occur.
  • This lamp shutdown is affected by use of the bulb clip member 36 which can be constructed of a metal having a spring coefficient that allows for the flexing of the extension arms 44 as shown in Fig. 3.
  • the bulb clip member 36 can also be constructed of a high temperature, non ⁇ conducting plastic material. Referring again to Fig.
  • any excessive pulling force exerted on the lamp envelope 14 will result in the flared end portion 14a of the lamp envelope 14 transferring such force to the region of the curved portions 42 of the bulb clip member 36. Sincere bulb clip member 36 is constructed of a resilient material, such force on the curved portion 42 will be translated in a direction away from the longitudinal axis of the electrodeless lamp 10 to exert a further force between the plurality of arm ends 44a to the lip portion 12a of the lamp base member 12. Should this force be increased above a threshold level, the result will be a breakage of the lamp envelope 14 at the point where the flared end portion 14a contacts the curved portions 42 of the bulb clip member 36.
  • the lamp 10 is effectively shut down by the fact that a no discharge condition will alter the loading on the ballast 24 thereby causing the circuit to shut down. Additionally, with the provision of at least one stop portion on the surface of the lamp envelope 14 at the flared end region 14a, if an excessive rotational force is exerted on the lamp envelope, the stop portion will contact the side of the extension arm 44a of the bulb clip member 36 such that a breakage will occur thus effectively shutting down the electrodeless lamp 10 under these conditions as well.
  • the bulb clip member 36 described in the lamp structure of Fig. 2 is more clearly illustrated in Fig. 3 where it can be seen that a plurality of extension arms 44a extend from a central hub portion 46 having the opening 40 formed centrally therein.
  • extension arms 44a there are four extension arms 44a extending from the central hub 46 spaced equally about the circumference of the central hub 46 so that the force needed to retain the lamp envelope 14 in the lamp base 12 is equally distributed. It should be understood that the benefits of the present invention could be equally well enjoyed by the provision of a different number of extension arms as that illustrated in this figure and that any variation of such number of arms is within the scope of the present invention.
  • the curved portions 42 formed on the extension arms 44a are sized to correspond closely to the flared end portion 14a groove of lamp envelope 14.
  • bend 48 is another bend portion formed in each extension arm, such bend 48 being effective for achieving the force transfer feature previously discussed.
  • an alternate bulb clip arrangement 50 to that shown in Fig.
  • each of the plurality of extension arms 54 includes a curved portion 54a similar to the curved portions 42 of the bulb clip member 36 of figs. 2 and 3, such curved portions 54a of alternate bulb clip member 50 also serving to contact the flared end region 14a of the lamp envelope 14 and secure the lamp envelope 14 to the bulb clip member 50 thereby.
  • the envelope and clip arrangement 14, 50 is secured to the lamp base 12 in a similar manner as discussed relative to the bulb clip arrangement of Fig. 2.
  • the alternate bulb clip member 50 fits just under the lip portion 12a of the lamp base 12 and further, is prevented from dislocating to a downward position within the lamp base 12 by the sizing of the annular ring 52 which is larger than the inside diameter of the lamp base 12 at that region just below the lip portion 12a of the lamp base 12. Also as previously discussed, the selection of four as the number of extension arms 52 is considered to be a design choice that could be modified without departing from the inventive concept embodied in the present invention. As seen in Figures 5 and 6, two other alternate bulb clip arrangements 60 and 70 are shown. In each of these embodiments, a central annular ring portion 62, 72 is provided and first and second sets of extension arms are provided extending from each of the respective annular rings 62, 72. In Fig. 5, the first set of extension arms 64 extend downward and are effective for clamping the bulb clip 60 to the lamp envelope 14. The second set of extension arms 66 clamp the bulb clip 60 and lamp envelope assembly to the lamp base 12.
  • the bulb clip 70 of Fig. 6 has a first set of extension arms 74 which clamp the bulb clip to the lamp envelop 14 and a second set of extension arms, extending outward from the annular ring portion 72 for clamping the bulb clip 70 and lamp envelope 14 to the lamp base 12.

Landscapes

  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)

Abstract

Ensemble de fixation destiné à assurer la fixation d'une enveloppe (14) sur le culot (12) d'une lampe à décharge (10) fluorescente sans électrode. L'ensemble de fixation comporte une attache de fixation d'ampoule (36) présentant un support central ainsi qu'une pluralité de bras (44). Chacun des bras (44) est équipé d'au moins deux parties cintrées, dont l'une s'appuie contre le col (12a) formée sur le culot de lampe, assurant ainsi la fixation de l'attache (36) audit culot (12). La deuxième partie cintrée (42) de chacun des bras (44) vient en contact avec un renfoncement formé au niveau de l'enveloppe de lampe (14) qui s'adapte dans le culot de lampe (12). Le contact intime entre le culot (12) et l'enveloppe (14) établi grâce à l'attache de fixation d'ampoule (36) permet d'empêcher le mouvement de rotation de l'enveloppe (14) par rapport au culot (12). Le contact entre la pluralité de bras (44) et l'enveloppe (14) est tel que, si l'on applique sur l'enveloppe (14) une force excessive, celle-ci se brise à l'intérieur du culot (12) plutôt qu'au niveau de sa région extérieure.
EP95914456A 1994-04-11 1995-04-06 Lampe a decharge sans electrode Expired - Lifetime EP0704101B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9407132 1994-04-11
GB9407132A GB9407132D0 (en) 1994-04-11 1994-04-11 Bulb mounting arrangement for an electrodeless discharge lamp
PCT/GB1995/000797 WO1995027995A1 (fr) 1994-04-11 1995-04-06 Ensemble de fixation d'ampoule pour lampe a decharge sans electrode

Publications (2)

Publication Number Publication Date
EP0704101A1 true EP0704101A1 (fr) 1996-04-03
EP0704101B1 EP0704101B1 (fr) 1999-09-08

Family

ID=10753343

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95914456A Expired - Lifetime EP0704101B1 (fr) 1994-04-11 1995-04-06 Lampe a decharge sans electrode

Country Status (6)

Country Link
EP (1) EP0704101B1 (fr)
JP (1) JPH08511650A (fr)
CA (1) CA2164708A1 (fr)
DE (1) DE69511975T2 (fr)
GB (1) GB9407132D0 (fr)
WO (1) WO1995027995A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6736526B2 (en) 2001-03-27 2004-05-18 Matsushita Electric Industrial Co., Ltd. Bulb-type lamp and manufacturing method for the bulb-type lamp

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2314689A (en) * 1996-06-26 1998-01-07 Gen Electric Coil assembly
TW550624B (en) 2001-04-26 2003-09-01 Matsushita Electric Ind Co Ltd Self-ballasted electrodeless discharge lamp and electrodeless discharge lamp
JP2003257379A (ja) 2001-12-28 2003-09-12 Matsushita Electric Ind Co Ltd 無電極放電ランプ
JP4089498B2 (ja) * 2003-04-28 2008-05-28 松下電工株式会社 無電極放電灯
WO2006001091A1 (fr) * 2004-06-25 2006-01-05 Matsushita Electric Works, Ltd. Lampe à décharge sans électrode
JP2007059358A (ja) 2005-08-26 2007-03-08 Matsushita Electric Works Ltd 無電極放電ランプ

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1832751A (en) * 1929-05-15 1931-11-17 Gen Electric Base for electric lamps and similar articles
US2157051A (en) * 1937-03-25 1939-05-02 Birdseye Electric Company Electric lamp
NL8602378A (nl) * 1986-04-29 1987-11-16 Philips Nv Elektrische lamp.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9527995A1 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6736526B2 (en) 2001-03-27 2004-05-18 Matsushita Electric Industrial Co., Ltd. Bulb-type lamp and manufacturing method for the bulb-type lamp
US6793373B2 (en) 2001-03-27 2004-09-21 Matsushita Electric Industrial Co., Ltd. Bulb-type lamp and manufacturing method for the bulb-type lamp

Also Published As

Publication number Publication date
DE69511975D1 (de) 1999-10-14
CA2164708A1 (fr) 1995-10-19
EP0704101B1 (fr) 1999-09-08
DE69511975T2 (de) 2000-05-18
JPH08511650A (ja) 1996-12-03
GB9407132D0 (en) 1994-06-01
WO1995027995A1 (fr) 1995-10-19

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