Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Plural periodic switches or multiple contact periodic switch
Reexamination Certificate
2006-03-28
2006-03-28
Lee, Wilson (Department: 2821)
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Plural periodic switches or multiple contact periodic switch
C315SDIG002, C315S291000
Reexamination Certificate
active
07019465
ABSTRACT:
A discharge lamp illumination circuit1has a DC-AC conversion circuit3which effects DC-AC conversion and boosting upon receipt of a DC input, and a starter circuit4. The DC-AC conversion circuit3has an AC transformer7, a plurality of switching elements5H and5L, and a resonance capacitor8. The switching elements are activated by control means6, thereby inducing series resonance between the resonance capacitor8and an inductance component of the AC transformer7, or between the resonance capacitor8and an inductance element connected to the resonance capacitor8. In connection with the operating frequency of the switching elements, a first frequency value is a frequency value of a period when outputs are open before the discharge lamp10is illuminated, and a second frequency value is a frequency value of a period from illumination of the discharge lamp by the starter circuit until elapse of a predetermined time period or a time period which is specified in accordance with an illumination state. The first frequency value is specified to be identical with the first frequency value, or to be close to the first frequency value.
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Ito Masayasu
Muramatsu Takao
Fish & Richardson P.C.
Koito Manufacturing Co. Ltd.
Lee Wilson
Vy Hung Tran
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