Patent ID: 7432670
Filing Date: 2008-10-07
Classification: H05B,Y10S

Abstract:
1. A lighting device for a high-pressure discharge lamp comprising: a lighting circuit for controlling at least one of voltage and current fed from an external power supply to the high-pressure discharge lamp so as to turn on the high-pressure discharge lamp; an igniter circuit for applying start-up high-voltage pulses to the high-pressure discharge lamp; a turn on detection circuit for detecting the lamp turn on; a first timer which permits igniter circuit operation for a predetermined period if the high-pressure discharge lamp is not turned on; a second timer which activates the first timer at a predetermined intermittent time interval repetitively; a third timer which counts the time elapsed for restarting the high-pressure discharge lamp, and prohibits the operation of the igniter circuit after predetermined restarting time had reached; a sixth timer which permits igniter circuit operation within said predetermined period of the first timer; and a seventh timer which activates the sixth timer at a predetermined intermittent time interval repetitively.