US4568859A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Discharge lamp with interference shielding
Assignee: US Philips Corp
•
Filing: 1983-12-20
•
Granted: 1986-02-04
•
Expires: 2003-12-20
Abstract
Abstract A discharge lamp having a sealed glass vessel filled with gas and a metal vapor, operated with a supply at a frequency of at least 20 kHz. An interference-suppressing conductive layer is arranged on a wall surface surrounding the discharge, and connected to an electric supply lead-in wire. Preferably, a plurality of insulated metal rings, on the outside of the wall, also surround the discharge.
Inventors
- 👤 Henk Houkes
- 👤 Jan W. Denneman
- 👤 Pieter Postma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:58
CPC Classifications
H; H01; H01J; H01J65/00; H01J65/04; H01J65/042; H01J65/048; H01J61/00; H01J61/02; H01J61/30; H01J61/35
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
115 words
A discharge lamp comprising: a glass lamp vessel having a wall, and sealed in a vacuum-tight manner, a metal vapor and a rare gas contained within said vessel, said vessel and said vapor and gas being arranged and selected such that said lamp is operable with a high-frequency supply voltage to produce an electric discharge within the vessel, at least one lead-in wire for connection to electric supply means, and an interference-suppressing transparent conductive layer disposed on a surface of the wall of said vessel, arranged to surround the discharge, characterized in that said interference-suppressing layer has a sheet resistance of at most approximately 100 ohms, and is connected to one of said lead-in wires.
Claim 2
Dependent Claim
115 words
A discharge lamp comprising: a glass lamp vessel having a wall, and sealed in a vacuum-tight manner, a metal vapor and a rare gas contained within said vessel, said vessel and said vapor and gas being arranged and selected such that said lamp is operable with a high-frequency supply voltage to produce an electric discharge within the vessel, at least one lead-in wire for connection to electric supply means, and an interference-suppressing transparent conductive layer disposed on a surface of the wall of said vessel, arranged to surround the discharge, characterized in that said interference-suppressing layer has a sheet resistance of at most approximately 100 ohms, and is connected to one of said lead-in wires.
Claim 3
Dependent Claim
18 words
A lamp is claimed in claim 1, characterized in that the interference-suppressing layer consists of tin-doped indium oxide.
Claim 4
Dependent Claim
42 words
An electrodeless lamp as claimed in claim 2, characterized in that the glass vessel and filling are selected for operation at a frequency of more than 1 MHz, and that the sheet resistance of the interference-suppressing layer is at most 100 ohms.
Claim 5
Dependent Claim
42 words
An electrodeless lamp as claimed in claim 1, characterized in that the glass vessel and filling are selected for operation at a frequency of more than 1 MHz, and that the sheet resistance of the interference-suppressing layer is at most 100 ohms.
Claim 6
Dependent Claim
147 words
A discharge lamp comprising: a glass lamp vessel havng a wall, and sealed in a vacuum-tight manner, a metal vapor and a rare gas contained within said vessel, said vessel and said vapor and gas being arranged and selected such that said lamp is operable with a high-frequency supply voltage to produce an electric discharge within the vessel, at least one lead-in wire for connection to electric supply means, and an interference-suppressing transparent conductive layer disposed on a surface of the wall of said vessel, arranged to surround the discharge, characterized in that said interference-suppressing layer has a sheet resistance of at most 100 ohms, and is connected to one of said lead-in wires, and the lamp includes a plurality of metal rings, insulated from each other and from said lead-in wires, arranged on the outside of said lamp vessel wall so as to surround the discharge.
Claim 7
Dependent Claim
147 words
A discharge lamp comprising: a glass lamp vessel havng a wall, and sealed in a vacuum-tight manner, a metal vapor and a rare gas contained within said vessel, said vessel and said vapor and gas being arranged and selected such that said lamp is operable with a high-frequency supply voltage to produce an electric discharge within the vessel, at least one lead-in wire for connection to electric supply means, and an interference-suppressing transparent conductive layer disposed on a surface of the wall of said vessel, arranged to surround the discharge, characterized in that said interference-suppressing layer has a sheet resistance of at most 100 ohms, and is connected to one of said lead-in wires, and the lamp includes a plurality of metal rings, insulated from each other and from said lead-in wires, arranged on the outside of said lamp vessel wall so as to surround the discharge.
Claim 8
Dependent Claim
19 words
A lamp as claimed in claim 5, characterized in that said plurality of rings consists of three copper wires.
Claim 9
Dependent Claim
27 words
A lamp as claimed in claim 5, characterized in that said plurality of metal rings consists of at least three and a maximum of five metal rings.
References Cited (Backward Citations)
US3753036A
Cited
JPS534382A
Cited
US4129802A
Cited
US4233653A
Cited
US4226167A
Cited
US4254363A
Cited
US4360761A
Cited
US4358701A
Cited
US4427921A
Cited
US4427924A
Cited
US4492898A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-02-03 | 1989-08-05 | 1990-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-03 | 1993-08-05 | 1994-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-03 | 1997-08-05 | 1998-02-04 | $7700.00 | Window Closed / Lapsed |