Discharge lamp illumination circuit and discharge lamp...

Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Plural periodic switches or multiple contact periodic switch

Reexamination Certificate

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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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