US4527097A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-pressure sodium discharge lamp
Assignee: US Philips Corp
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Filing: 1983-05-02
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Granted: 1985-07-02
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Expires: 2003-05-02
Abstract
Abstract The invention relates to a high-pressure sodium lamp provided with an elongate discharge vessel in which the pressure P in the operative condition of the lamp is at least 170×10 3 Pa. The lamp is suitable to be operated with a power of periodically alternating value, which power comprises at least one component having a frequency ν i which satisfies i-0.45≦2.35ν i Le/e≦i+0.45 where i is an integral positive number, c is the speed of sound in the gaseous part of the filling and L e is the effective length of the discharge vessel. According to the invention, the relation is satisfied: Mν i ·f i ·P·d ≦185, in which Mν i is the modulation depth of the power component having a frequency ν i , f i is a geometric lamp factor and d the average inner diameter of the discharge vessel. In this manner, the operation of the lamp is free of arc instabilities due to longitudinal acoustic resonances.
Inventors
- 👤 Rudolf L. A. van der Heijden
- 👤 Jan W. F. Dorleijn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:42
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/84; H01J61/88; H01J61/82; H01J61/825
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
214 words
A high-pressure sodium discharge lamp provided with an elongate discharge vessel which encloses a discharge vessel which encloses a discharge path and which vessel has an effective length L e and, over at least 2/3 of the discharge path a cross-section S of constant area, in which vessel two electrodes are arranged each having an end, between which ends the discharge path extends, said lamp being operative with a power of periodically alternating value, this power comprising one or more power components sinusoidally varying with time and at least one component having a frequency ν i for which it holds that i-0.45≦2.35ν i Le/c≦i+0.45, where i is an integral positive number and c is the average speed in m/s of propagation of sound waves through the gaseous part of the filling of the discharge vessel in the operative condition of the lamp, characterized in that the filling in the operative condition has a pressure P of at least 170×10 3 Pa and in that for each value of i the relation Mν i ·f i ·P·d≦185 is satisfied, in which Mν i is the modulation depth of the power component frequency ν i , f i is a geometric lamp factor and d is the mean inner diameter of the cross-section S in meters.
Claim 2
Dependent Claim
214 words
A high-pressure sodium discharge lamp provided with an elongate discharge vessel which encloses a discharge vessel which encloses a discharge path and which vessel has an effective length L e and, over at least 2/3 of the discharge path a cross-section S of constant area, in which vessel two electrodes are arranged each having an end, between which ends the discharge path extends, said lamp being operative with a power of periodically alternating value, this power comprising one or more power components sinusoidally varying with time and at least one component having a frequency ν i for which it holds that i-0.45≦2.35ν i Le/c≦i+0.45, where i is an integral positive number and c is the average speed in m/s of propagation of sound waves through the gaseous part of the filling of the discharge vessel in the operative condition of the lamp, characterized in that the filling in the operative condition has a pressure P of at least 170×10 3 Pa and in that for each value of i the relation Mν i ·f i ·P·d≦185 is satisfied, in which Mν i is the modulation depth of the power component frequency ν i , f i is a geometric lamp factor and d is the mean inner diameter of the cross-section S in meters.
Claim 3
Dependent Claim
68 words
A lamp as claimed in claim 1, in which the discharge vessel is substantially symmetrical with respect to a plane at right angles to the longitudinal axis of the discharge vessel, characterized in that the same insertion depth PB is associated with each electrode and in that in the operative condition of the lamp, for each even value of i the relation is satisfied: Mν.sub.i ·2/i|sin i πPB/Le|·P·d≦185.
Claim 4
Dependent Claim
26 words
A lamp as claimed in claim 1, characterized in that in the operative condition of the lamp the relation is satisfied: Mν i ·f i ·P·d≦140.
Claim 5
Dependent Claim
41 words
A lamp as claimed in claim 1, characterized in that the operating power of the lamp is composed of one or more current and voltage components sinusoidally varying with time, the frequencies of which all amount to at least 20 kHz.
Claim 6
Dependent Claim
49 words
A lamp as claimed in claim 1, the consumed power of which in the operative condition is at most 100 W, characterized in that in the operative condition of the lamp the pressure in the discharge vessel is at least 300×10 3 Pa and at most 1600×10 3 Pa.
Claim 7
Dependent Claim
41 words
A lamp as claimed in claim 2, characterized in that the operating power of the lamp is composed of one or more current and voltage components sinusiodally varying with time, the frequencies of which all amount to at least 20 kHz.
Claim 8
Dependent Claim
41 words
A lamp as claimed in claim 3, characterized in that the operating power of the lamp is composed of one or more current and voltage components sinusoidally varing with time, the frequencies of which all amount to at least 20 kHz.
Claim 9
Dependent Claim
49 words
A lamp as claimed in claim 2, the consumed power of which in the operative condition is at most 100 W, characterized in that in the operative condition of the lamp the pressure in the discharge vessel is at least 100×10 3 Pa and at most 1600×10 3 Pa.
Claim 10
Dependent Claim
49 words
A lamp as claimed in claim 3, the consumed power of which in the operative condition is at most 100 W, characterized in that in the operative condition of the lamp the pressure in the discharge vessel is at least 300×10 3 Pa and at most 1600×10 3 Pa.
Claim 11
Dependent Claim
49 words
A lamp as claimed in claim 4, the consumed power of which in the operative condition is at most 100 W, characterized in that in the operative condition of the lamp the pressure in the discharge vessel is at least 300×10 3 Pa and at most 1600×10 3 Pa.
References Cited (Backward Citations)
US4109175A
Cited
US4052636A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-01 | 1988-12-31 | 1989-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-01 | 1992-12-31 | 1993-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-01 | 1996-12-31 | 1997-07-02 | $7700.00 | Window Closed / Lapsed |