EP0198523A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Electrodeless low-pressure discharge lamp
Assignee: Koninklijke Philips NV
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Filing: 1986-03-07
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Granted: —
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Expires: 2006-03-07
Abstract
Abstract An electrodeless low-pressure discharge lamp comprising a glass lamp vessel (1) which is sealed in a gas-tight manner and is filled with a metal vapour and a rare gas, this lamp being provided with a core (4) of ferrite, while during operation of the lamp an electrical discharge is maintained in the lamp vessel by means of a wire winding (5) connected to a high-frequency supply unit and arranged to surround the core (4), the winding (5) being surrounded by a thin-walled cylindrical metal body (11) which is electrically insulated therefrom, is interrupted at at least one area (11 a) and isconnected during operation of the lamp to one of the mains conductors.
Inventors
- 👤 Pieter Postma
- 👤 Andreas Cornelus Van Veghel
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 03:12
CPC Classifications
H; H01; H01J; H01J65/00; H01J65/04; H01J65/042; H01J65/048
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
120 words
An electrodeless low-pressure discharge lamp comprising a glass lamp vessel which is sealed in a gas-tight manner and is filled with a metal vapour and a rare gas, this lamp being provided with a core of magnetic material, while during operation of the lamp an electric discharge is maintained in the lamp vessel by means of a wire winding connected to a high-frequency supplyunit and arranged to surround the core, characterized in that the winding is surrounded in its immediate proximity by an thin-walled cylindrical metal body which is electrically insulated therefrom, is interrupted throughout its length at at least one area and is connected during operation of the lamp to one of the lead-in wires of the supply mains.
Claim 2
Dependent Claim
120 words
An electrodeless low-pressure discharge lamp comprising a glass lamp vessel which is sealed in a gas-tight manner and is filled with a metal vapour and a rare gas, this lamp being provided with a core of magnetic material, while during operation of the lamp an electric discharge is maintained in the lamp vessel by means of a wire winding connected to a high-frequency supplyunit and arranged to surround the core, characterized in that the winding is surrounded in its immediate proximity by an thin-walled cylindrical metal body which is electrically insulated therefrom, is interrupted throughout its length at at least one area and is connected during operation of the lamp to one of the lead-in wires of the supply mains.
Claim 3
Dependent Claim
29 words
An electrodeless low-pressure discharge lamp as claimed in Claim 1, characterized in that the length of the cylindrical metal body is substantially equal to the length of the winding.
Claim 4
Dependent Claim
39 words
An electrodeless lamp as claimed in Claim 1 or 2, characterized in that the body is provided on the core at the area of the winding, while an electrically insulating layer is present between the body and the winding.
Claim 5
Dependent Claim
46 words
An electrodeless lamp as claimed in Claim 1 or 2, in which the core is rod-shaped and is situated in a tubular protuberance in the wall of the lamp vessel, characterized in that the body is present on the side of the protuberance facing the winding.
Claim 6
Dependent Claim
22 words
An electrodeless lamp as claimed in Claim 1, 2, 3 or 4, characterized in that the body consists of a metal foil.
Claim 7
Dependent Claim
20 words
An electrodeless lamp as claimed in Claim 1, 2, 3, 4 or 5, characterized in that the body comprises coppa:
References Cited (Backward Citations)
US3521120A
Cited
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