H - Electricity – 01 – J
Patent
H - Electricity
01
J
315/56
H01J 11/04 (2006.01) H01J 61/54 (2006.01) H05B 41/04 (2006.01)
Patent
CA 1232318
TITLE OF THE INVENTION: A HIGH INTENSITY DISCHARGE LAMP IGNITION SYSTEM ABSTRACT OF THE DISCLOSURE A high intensity discharge (HID) lamp has an arc tube includ- ing a pair of main electrodes and at least one auxiliary electrode or probe, wherein a high frequency (HF) high vol- tage is applied to the probe for forming a high frequency (HF) ignition discharge for establishing a low frequency (LF) arc discharge between the main electrodes. In this ignition sys- tem, the electrodes of the arc tube are arranged so that an LF discharge path and an HF discharge path are positioned in an X- or a Y-configuration in the arc tube for causing easy lamp ignition. Also, to simplify the outer leads, it is desirable to mount the probe on one of the main electrodes by a dielec- tric member opposite another main electrode thereby to form a shorter gap between the probe and the other main electrodes than that between the main electrodes. The starting device of HID lamps has a high frequency - high voltage (HF-HV) genera- tor, the output of which is applied, directly or indirectly, to the probe. Accordingly, sure ignition and hot-restrike can be achieved by applying through the outer leads a super- imposed voltage including the source voltage and the MF-HV. - 1 -
436667
Gowling Lafleur Henderson Llp
Nec Home Electronics Ltd.
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