EP0583034A1 - Elektrische Lampe - Google Patents

Elektrische Lampe Download PDF

Info

Publication number: EP0583034A1
Authority: EP; European Patent Office
Prior art keywords: lamp; lamp cap; light source; shell; base
Prior art date: 1992-08-10
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

EP93202333A

Other languages

English (en)

French (fr)

Other versions

EP0583034B1 (de

Inventor

Lambertus J.M. c/o INT. OCTROOIBUREAU BV Bouwman

Guillaume M.P.G. Hermes

Cornelis J. c/o INT. OCTROOIBUREAU BV Janson

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

Koninklijke Philips Electronics NV

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.)

1992-08-10

Filing date

1993-08-09

Publication date

1994-02-16

1993-08-09 Application filed by Koninklijke Philips Electronics NV, Philips Electronics NV filed Critical Koninklijke Philips Electronics NV

1993-08-09 Priority to EP19930202333 priority Critical patent/EP0583034B1/de

1994-02-16 Publication of EP0583034A1 publication Critical patent/EP0583034A1/de

1996-11-13 Application granted granted Critical

1996-11-13 Publication of EP0583034B1 publication Critical patent/EP0583034B1/de

2013-08-09 Anticipated expiration legal-status Critical

Status 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

Definitions

the invention relates to an electric lamp comprising
Such an electric lamp is known from European Patent Application 156439.
the known lamp is designed for use in the same applications in which traditionally an incandescent lamp was used.
a major advantage of the known lamp over an incandescent lamp is that the luminous efficacy of the known lamp is considerably higher than the luminous efficacy of an incandescent lamp.
a disadvantage, however, is the fact that the length of the known lamp is greater than that of an incandescent lamp, so that the known lamp is less suitable as a replacement for an incandescent lamp in some applications. It is accordingly desirable to reduce the length of the known lamp in order to increase the range of application of this lamp.
a further reduction in the length of the lamp is often accompanied by a size reduction of the housing, whereby the capacitive coupling between the ballast means often present in the housing and the contacts on the lamp cap increases.
This capacitive coupling increases even further when the ballast means are partly provided in the lamp cap in order to facilitate a further size reduction of the lamp.
the ballast means may consist, for example, of a coil when the electric lamp is operated with a current whose frequency is identical to that of the mains voltage with which the lamp is supplied. In that case there is a low-frequency lamp operation.
the ballast means may comprise a circuit arrangement for generating a high-frequency current from the mains voltage, with which the electric lamp is supplied, for operating the electric lamp.
the ballast means cause a comparatively high degree of interference in the supply voltage mains during lamp operation, especially when the electric lamp is operated at a high frequency.
the invention has for its object inter alia to provide an electric lamp of a comparatively small length which causes a comparatively low degree of interference in the supply voltage mains during lamp operation.
this object is achieved in an electric lamp of the kind mentioned in the opening paragraph in that the further contact is formed by a band of conducting material around the lamp cap, which band directly adjoins the base at one side and adjoins a band of insulating material around the lamp cap at another side.
the further contact extends over substantially the entire surface area of the lamp cap shell.
Such a comparatively large surface area of the further contact causes a comparatively strong capacitive coupling between the further contact and the ballast means.
the size of the further contact is much smaller than in the known lamp.
the further contact is arranged at a comparatively great distance from the space surrounded by the housing and from a major portion of the space surrounded by the lamp cap since this contact directly adjoins the base. This comparatively great distance and the considerably smaller size of the further contact have the result that the capacitive coupling between the ballast means and the further contact is much weaker.
the ballast means comprise a circuit arrangement for generating a high-frequency current from the mains voltage, a comparatively strong decrease of the interference in the supply voltage mains was found.
the shell of the lamp cap of the known lamp is made from metal, so that the shell at the same time constitutes the further contact. Since the further contact of an electric lamp according to the invention, however, does not extend over substantially the entire external surface area of the lamp cap shell, but only over a comparatively small portion of the lamp cap, the idea suggests itself to manufacture the lamp cap from an insulating synthetic material and to provide the contact thereon. Since the housing of the electric lamp is also preferably manufactured from a synthetic material, it is possible to integrate the lamp cap and the housing of an electric lamp according to the invention into one component made of synthetic material. As a result, such a lamp comprises fewer components and the assembling costs of these lamp components are strongly reduced.
the lamp caps shown in Figs. 1a and 1b are both of the Edison type.
the shell is threaded for fastening the lamp cap in a lampholder.
Metal parts of the lamp cap are shown in black and synthetic-resin parts in white.
5 denotes the base of the lamp cap
1 denotes the first contact and 2 the further contact.
the boundary between base and shell is indicated with a broken line.
the lamp cap has a shell 3.
the shell 3 is formed by the band of insulating material around the lamp cap and the component 4 formed from metal which is electrically insulated from the first contact 1 and the further contact 2.
Component 3 in both cases forms a integral unit with the base of the lamp cap.
lamp caps other than those of the Edison type such as, for example, bayonet type lamp caps.
FIG. 2 components corresponding to the components of the lamp caps shown in Fig. 1 have the same reference numerals as in Fig. 1.
Reference numeral 6 denotes the wall of the housing and A and B are boundary planes, indicated with broken lines, between the shell and the base of the lamp cap and between the lamp cap and the housing, respectively. It can be seen that the housing and the lamp cap have been integrated into one unit formed from synthetic resin.
7 denotes the space surrounded by the housing and the lamp cap in which ballast means, for example comprising a circuit arrangement for generating a high-frequency current for operating the light source, are accommodated (not shown in Fig. 2)
8 denotes a discharge vessel which forms part of the light source, which is sealed in a gastight manner and which transmits radiation.
Fig. 3 shows two frequency spectra of the interference caused by two compact low-pressure mercury lamps of a power rating of 11 W in the supply mains.
the low-pressure mercury lamps were operated at a frequency of 45 kHz.
the power of the interference caused is indicated on the vertical axis in decibels.
the frequency is plotted on the horizontal axis in MHz. It is also shown in both frequency spectra by means of the curve M how great the intensity of the interference caused is allowed to be at most according to the CISPR standard.
the first lamp provided with a lamp cap of the Edison type whose shell was completely formed from metal yielded a frequency spectrum of the interference caused by the lamp in the supply mains as indicated in Fig. 3a.
Fig. 3b shows the frequency spectrum of the interference generated in the supply mains by a lamp according to the invention. This second lamp was provided with a lamp cap as shown in Figs. 1a and 2. It is visible from Fig. 3b that the interference caused by a lamp according to the invention lies below the maximum admissible value throughout the entire frequency range.

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Non-Portable Lighting Devices Or Systems Thereof (AREA)

EP19930202333 1992-08-10 1993-08-09 Elektrische Lampe Expired - Lifetime EP0583034B1 (de)

Priority Applications (1)

Application Number	Priority Date	Filing Date	Title
EP19930202333 EP0583034B1 (de)	1992-08-10	1993-08-09	Elektrische Lampe

Applications Claiming Priority (3)

Application Number	Priority Date	Filing Date	Title
EP92202455		1992-08-10
EP92202455		1992-08-10
EP19930202333 EP0583034B1 (de)	1992-08-10	1993-08-09	Elektrische Lampe

Publications (2)

Publication Number	Publication Date
EP0583034A1 true EP0583034A1 (de)	1994-02-16
EP0583034B1 EP0583034B1 (de)	1996-11-13

Family

ID=26131621

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP19930202333 Expired - Lifetime EP0583034B1 (de)	1992-08-10	1993-08-09	Elektrische Lampe

Country Status (1)

Country	Link
EP (1)	EP0583034B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE29706588U1 (de) *	1997-04-14	1997-07-31	Mass Technology (H.K.) Ltd., Tsim Sha Tsui, Kowloon	Sockel für Lampe
EP0975000A1 (de) *	1998-07-18	2000-01-26	Mass Technology (H.K.) Ltd.	Elektrische Lampe
US6384521B1 (en) *	1998-06-22	2002-05-07	U.S. Philips Corporation	Electric lamp with a comparatively robust lamp cap

Citations (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US4495443A (en) *	1984-01-27	1985-01-22	Cummings John H	Compact fluorescent lamp combination, and method of making it
EP0156439A1 (de) *	1984-03-23	1985-10-02	Koninklijke Philips Electronics N.V.	Elektrische Schaltungsanordnung zum Starten und Speisen einer Gas- und/oder Dampf-Entladungslampe

1993
- 1993-08-09 EP EP19930202333 patent/EP0583034B1/de not_active Expired - Lifetime

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US4495443A (en) *	1984-01-27	1985-01-22	Cummings John H	Compact fluorescent lamp combination, and method of making it
EP0156439A1 (de) *	1984-03-23	1985-10-02	Koninklijke Philips Electronics N.V.	Elektrische Schaltungsanordnung zum Starten und Speisen einer Gas- und/oder Dampf-Entladungslampe

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE29706588U1 (de) *	1997-04-14	1997-07-31	Mass Technology (H.K.) Ltd., Tsim Sha Tsui, Kowloon	Sockel für Lampe
US6384521B1 (en) *	1998-06-22	2002-05-07	U.S. Philips Corporation	Electric lamp with a comparatively robust lamp cap
EP0975000A1 (de) *	1998-07-18	2000-01-26	Mass Technology (H.K.) Ltd.	Elektrische Lampe
US6344708B1 (en)	1998-07-18	2002-02-05	Mass Technology (H. K.) Ltd.	Energy saving lamp with plastic base

Also Published As

Publication number	Publication date
EP0583034B1 (de)	1996-11-13

Legal Events

Date	Code	Title	Description
1993-12-30	PUAI	Public reference made under article 153(3) epc to a published international application that has entered the european phase	Free format text: ORIGINAL CODE: 0009012
1994-02-16	AK	Designated contracting states	Kind code of ref document: A1 Designated state(s): BE DE ES FR GB IT NL
1994-08-24	RAP1	Party data changed (applicant data changed or rights of an application transferred)	Owner name: N.V. PHILIPS' GLOEILAMPENFABRIEKEN
1994-09-21	17P	Request for examination filed	Effective date: 19940728
1995-05-10	17Q	First examination report despatched	Effective date: 19950328
1996-03-30	GRAH	Despatch of communication of intention to grant a patent	Free format text: ORIGINAL CODE: EPIDOS IGRA
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