Reducing vertical segregation in a HID lamp operated at VHF frequencies using simultaneous arc straightening and color mixing
AssigneeKoninklijke Philips Electronics N.V.
InventorJerry Martin Kramer
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Abstract
A method and structure for substantially overcome vertical segregation in HID lamps, the method comprising the steps of: determining and selecting a frequency sweep signal to produce arc straightening and a fixed frequency signal for exciting a second longitudinal acoustic mode; and exciting in conjunction with a carrier frequency an arc straightening acoustic mode together with a second longitudinal acoustic mode excitation. In a preferred embodiment, the exciting step comprises amplitude modulating the carrier frequency signal with a sum of the frequency sweep signal and the fixed frequency signal.
Claims30
A method to substantially overcome vertical segregation in HID lamps, comprising the steps of:
- determining and selecting a frequency sweep signal to produce arc straightening and a fixed frequency signal for exciting a second longitudinal acoustic mode;
- and
- exciting in conjunction with a carrier frequency an arc straightening acoustic mode together with a second longitudinal acoustic mode excitation.
An HID lamp with arc straightening, comprising:
- a discharge vessel containing an ionizable filling;
- and
- a circuit for exciting in conjunction with a carrier frequency an arc straightening acoustic mode together with a second longitudinal acoustic mode in the discharge vessel.
Dependencies are inferred from the claim text.