Device for applying particular voltage waveform for operating a discharge lamp
First Claim
1. Device for operating a fluorescent discharge lamp of the outer electrode type in which at least one of rare gases He, Ne, Ar, Kr, and Xe is hermetically sealed in within a glass tube and in which a fluorescent material is applied to an inner side of the glass tube, and in which at least two strip-shaped electrodes extend along an outer side of the glass tube in an axial direction thereof, comprising means for applying a lamp voltage to the electrodes which has a periodic voltage waveform with a single maximum peak value within a repetition period that is greater than twice the width of the waveform at a voltage of 0 V, wherein a half-value width W of said single maximum peak value is set to a predetermined value in the range of 10 μ
- s≦
t≦
30 μ
s.
1 Assignment
0 Petitions
Accused Products
Abstract
The invention relates to a device for operating a fluorescent discharge lamp of the outer electrode type. As claimed in the invention a switching device is turned on and off by driver signals with a stipulated frequency, by which on the secondary side of a transformer the periodic voltage waveform shown at A in FIG. 1 is produced. This voltage waveform is applied to the fluorescent discharge lamp of the outer electrode type, and thus operation is effected. For the above described periodic voltage waveform, with respect to repetition period t 2 Wo<t, if the width at a voltage of the waveform of 0 V which has a single maximum peak value within one period is labeled WO, its full width at half maximum (the width between a and b in FIG. 1) being set to a stipulated value (for example, to a value of less than or equal to 2.5 μsec). This makes it possible to maintain stable emission even if the pressure of the gas filled in the discharge lamp is increased. In this way high illumination intensity can be obtained.
20 Citations
17 Claims
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1. Device for operating a fluorescent discharge lamp of the outer electrode type in which at least one of rare gases He, Ne, Ar, Kr, and Xe is hermetically sealed in within a glass tube and in which a fluorescent material is applied to an inner side of the glass tube, and in which at least two strip-shaped electrodes extend along an outer side of the glass tube in an axial direction thereof, comprising means for applying a lamp voltage to the electrodes which has a periodic voltage waveform with a single maximum peak value within a repetition period that is greater than twice the width of the waveform at a voltage of 0 V, wherein a half-value width W of said single maximum peak value is set to a predetermined value in the range of 10 μ
- s≦
t≦
30 μ
s. - View Dependent Claims (2, 3, 4, 5, 6)
- s≦
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7. A fluorescent discharge lamp of the outer electrode type in which at least one of rare gases He, Ne, Ar, Kr, and Xe is hermetically sealed in within a glass tube and in which a fluorescent material is applied to an inner side of the glass tube, and in which at least two strip-shaped electrodes extend along an outer side of the glass tube in an axial direction thereof, and having means for applying a lamp voltage to the electrodes which has a periodic voltage waveform with a single maximum peak value within a repetition period that is greater than twice the width of the waveform at a voltage of 0 V, wherein a half-value width W of said single maximum peak value is set to a predetermined value in the range of 10 μ
- s≦
t≦
30 μ
s. - View Dependent Claims (8, 9, 10, 11, 12)
- s≦
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13. Method of operating a fluorescent discharge lamp of the outer electrode type in which at least one of rare gases He, Ne, Ar, Kr, and Xe is hermetically sealed in within a glass tube and in which a fluorescent material is applied to an inner side of the glass tube, and in which at least two strip-shaped electrodes extend along an outer side of the glass tube in an axial direction thereof, comprising the step of applying a lamp voltage to the electrodes which has a periodic voltage waveform with a single maximum peak value within a repetition period that is greater than twice the width of the waveform at a voltage of 0 V, wherein a half-value width W of said single maximum peak value is set to a predetermined value in the range of 10 μ
- s≦
t≦
30 μ
s. - View Dependent Claims (14, 15, 16, 17)
- s≦
Specification