Electric lamp and discharge devices – With gas or vapor – Having electrode exterior to envelope
Patent
1998-05-06
2000-05-09
Patel, Nimeshkumar D.
Electric lamp and discharge devices
With gas or vapor
Having electrode exterior to envelope
313234, 313491, 313631, H01J 1100
Patent
active
060608285
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to an electrical radiation source and this radiation source and having a voltage source.
During operation, the radiation source emits incoherent radiation by means of a dielectrically obstructed discharge. A dielectrically obstructed discharge is generated by virtue of the fact that one or both of the electrodes, connected to the voltage source, of the discharge arrangement is or are separated by a dielectric from the discharge in the interior of the discharge vessel (discharge dielectrically obstructed at one or both ends).
Here, incoherently emitting radiation sources are UV(Ultraviolet) sources and IR(Infrared) sources as well as discharge lamps which in particular radiate visible light.
Radiation sources of this type are suitable, depending on the spectrum of the emitted radiation, for general and auxiliary lighting, for example for domestic and office lighting and for background illumination of displays, for example LCDs (Liquid Crystal Displays), for traffic lighting and signal lighting, as well as for UV irradiation, for example sterilization or photolysis.
PRIOR ART
The invention proceeds from WO 94/23442 and the mode of operation, disclosed therein, of dielectrically obstructed discharges. This mode of operation uses a sequence, unlimited in principle, of voltage pulses which are separated from one another by dead times or off periods. The pulse shape and the durations of the pulse times and dead times, inter alia, are decisive for the efficiency of the useful radiation generation. It is preferred to make use for this mode of operation of narrow, for example strip-shape, electrodes which can be dielectrically obstructed at one or two ends. For example, if two elongated electrodes are situated parallel and opposite to one another, a multiplicity of similar discharge structures are produced which, in top view, that is to say at right angles to the plane in which the two electrodes are arranged, resemble a delta (.DELTA.), are lined up next to one another along the electrodes and widen in each case in the direction of the (instantaneous) anode. In the case of alternating polarity of the voltage pulses of a discharge dielectrically obstructed at two ends, visual overlapping of two delta-shaped structures appears. Since these discharge structures are preferably produced with repetition frequencies in the kHz range, the observer perceives only an "average" discharge structure, for example in the shape of an hour glass, corresponding to the temporal resolution of the human eye. The number of the individual discharge structures can be influenced, inter alia, by the electrical power injected. However, it is disadvantageous that individual discharge structures can, in some cases, spontaneously change their respective location along the electrodes, the result being a certain instability in the radiation distribution. In addition, the discharge structures can also accumulate in subregions of a discharge vessel, with the result that the radiation distribution can be very nonuniform with respect to the total volume of the discharge vessel.
A multitude of radiation sources for the operation by means of AC voltage are known from the patent literature. Here, too, the individual discharge structures can spontaneously change their location. Moreover, it cannot be predicted either at which particular site precisely an individual discharge will ignite. Rather, the development of the individual discharges exhibits a stochastic behaviour both spatially and temporally.
DE 40 10 809 A1, for example, discloses a high-power radiation source having electrodes of strip or wire shape arranged parallel to one another. In the respective longitudinal direction of two immediately adjacent electrodes of different polarity no location is particularly distinguished with respect to the neighbouring locations. As a consequence, the individual discharges igniting between these electrodes have one degree of freedom, corresponding to a common dimension of the parallel, elongate electrodes.
A radia
REFERENCES:
patent: 5723946 (1998-03-01), Park et al.
Hitzschke Lothar
Muecke Jens
Siebauer Rolf
Vollkommer Frank
Bessone Carlo S.
Hopper Todd Reed
Patel Nimeshkumar D.
Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen MBH
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