Method of initiating lighting of a discharge lamp, circuit for lighting a discharge lamp, light source device using the circuit, and optical instrument incorporating the light source device
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United States of America Patent
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N/A
Issued Date -
Oct 21, 2004
app pub date -
May 13, 2004
filing date -
Jan 30, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A method of initiating lighting of a discharge lamp is provided including applying to the discharge lamp to be lighted an initiating voltage resulting from superimposition of a step-up pulse voltage of 1,000 to 3,000 V onto a voltage of 500 to 1,500 V which is continuously applied to the discharge lamp. Also provided is a circuit for lighting a discharge lamp, including a ballast for lighting the discharge lamp, and a low-voltage igniter connected to the ballast for initiating lighting of the lamp, the low-voltage igniter comprising: a lighting diode having an input side connected to an output side of the ballast and an output side connected to the discharge lamp; and a step-up device for superimposing step-up pulses onto the output of the lighting diode via a step-up pulse supply branch line connected to the output side of the lighting diode in initiating lighting of the discharge lamp.
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