Electric lamp and discharge devices: systems – Pulsating or a.c. supply – Periodic-type current and/or voltage regulator in the supply...
Patent
1998-09-25
2000-07-04
Philogene, Haissa
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
Periodic-type current and/or voltage regulator in the supply...
315246, 315268, 313607, H05B 4116
Patent
active
060843608
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a device for operation of a discharge lamp in which a bulb consisting of a dielectric is hermetically filled with at least one sort of rare gas in a stipulated amount in which via the dielectric barrier in the bulb a discharge is caused and in which thus the discharge lamp is operated.
DESCRIPTION OF RELATED ART
In a discharge lamp in which a discharge vessel consisting of a dielectric material is filled with discharge gas with a rare gas as the main component, as is recognized in the vessel an excimer emission is formed when a high frequency voltage is applied via the dielectric barrier.
Depending on which light is desired, there are lamps in which on the inside of the discharge vessel a fluorescent material is applied, and there are those in which this is not the case.
Those lamps in which fluorescent material is not applied, are commercially sold as dielectric barrier discharge lamps. In them UV (ultraviolet) radiation is emitted from at least one part of the discharge vessel via the dielectric material. They are used for UV cleaning, activation of organic materials by UV radiation and for similar purposes.
On the other hand, those lamps in which fluorescent material is applied to the inside of the discharge vessel are known as fluorescent discharge lamps of the outside electrode type. Commercial lamps of this type are used for document scanning in office automation equipment, for back light of a liquid crystal display, and for similar purposes.
The above described dielectric barrier discharge lamps (hereinafter called only "discharge lamps" when necessary) have been conventionally operated under the condition that an uninterrupted HF voltage or pulsed HF voltage is applied to their electrodes.
Under the above described operating conditions however a discharge with high efficiency is not obtained. Therefore the inventors have performed various experiments and done checks. They indicated that by operating a discharge lamp by applying a periodic voltage waveform with a steep rise and maximum peak waveform, in which the width with respect to one repetition period t is less than or equal to a given value, a stable discharge with high efficiency can be maintained.
The inventors therefore have established and shown in already filed Japanese patent application HEI 8-4499 (WO 97/26779) for the voltage FWHM (full width half maximum) to be applied to the discharge lamp that in this FWHM the steep rise of the voltage waveform is effective for this discharge lamp.
As is illustrated in FIG. 9, in switching of switching device 8 by driver circuit 7 and when voltage is applied to discharge lamp 1 via transformer 9 it was possible to maintain a stable discharge and increase the illuminance by applying a periodic voltage waveform to discharge lamp 1 in which the FWHM W lies within a given value when the width between two points a and b is defined as FWHM W. This width has a voltage value (H/2 in the figure) which, proceeding from a position at which a waveform with maximum peak value of the voltage within the above described one period intersects voltage 0 V which has half of the maximum peak value (H in the Figure) as is illustrated in FIG. 9.
A small FWHM means a steep rise of the voltage. The smaller the FWHM became, the higher the illuminance became. Furthermore the illuminance in the above described establishment of a stipulated FWHM in a flyback operation type system was higher than in a conventional reciprocating operation type system.
As was described above, by making the FWHM smaller a higher illuminance can be obtained than in the conventional reciprocating operation type or similar operation system. Recently however it has been more and more desirable to operate a discharge lamp more efficiently.
The invention was devised based on the above described circumstances. Therefore the object of the invention was to devise a device for operating a discharge lamp in which by applying a lamp voltage with a voltage waveform which was conventionally never used, a dielectric b
REFERENCES:
patent: 5444331 (1995-08-01), Matsuno et al.
patent: 5581152 (1996-12-01), Matsuno et al.
patent: 5604410 (1997-02-01), Vollkommer et al.
patent: 5666026 (1997-09-01), Matsuno et al.
patent: 5666031 (1997-09-01), Jennato et al.
patent: 5757132 (1998-05-01), Matsuno et al.
patent: 5936358 (1999-08-01), Okamoto et al.
Mizojiri Takafumi
Yokokawa Yoshihisa
Yoshioka Masaki
Philogene Haissa
Safran David S.
Ushiodenki Kabushiki Kaisha
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