Electric lamp and discharge devices: systems – Current and/or voltage regulation
Reexamination Certificate
2011-08-02
2011-08-02
Vo, Tuyet Thi (Department: 2821)
Electric lamp and discharge devices: systems
Current and/or voltage regulation
C315S247000, C315S307000, C315S312000, C315S224000
Reexamination Certificate
active
07990075
ABSTRACT:
In order to optimally control power outputted from a high intensity discharge lamp lighting device for a difference among loads connected thereto, such as a difference in gas components contained in arc tubes and a difference in shape of the arc tubes individually in a plurality of discharge lamps11, plural kinds of output power characteristics W1, W2and W3as data tables of lamp voltage-lamp power are provided for a rating lamp voltage range of each of the high intensity discharge lamps1and a lamp voltage range lower than the rating lamp voltage range, there is provided minimum lamp voltage detecting means7for allowing predetermined power to be outputted in an event of starting the high intensity discharge lamp11, and detecting a minimum lamp voltage Vmin after the high intensity discharge lamp shifts to an arc discharge, and in response to that the detected minimum lamp voltage Vmin enters any range of a plurality of preset voltage ranges A, B and C, any of the data tables W1, W2and W3of the lamp voltage-lamp power, which correspond to the voltage ranges A, B and C, respectively, is selected.
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Fukuda Ken-ichi
Matsuzaki Nobutoshi
Greenblum & Bernstein P.L.C.
Panasonic Electric Works Co., Ltd.
Vo Tuyet Thi
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