DIRECTORATE FOR A LOAD LAMP AND PROJECTORY

摘要

A discharge lamp lighting device for lighting a discharge lamp (1) comprises: an ignitor (2) as starting means for applying a starting voltage to the discharge lamp (1) at the time of starting and thus lighting the discharge lamp (1); a voltage detection circuit (3) for detecting a voltage of the discharge lamp (1); and a current control circuit section (5) for controlling a current supplied to the discharge lamp (1) on the basis of the result of detection at the voltage detection circuit (3); wherein the current control circuit section (5), after ignition, starts controlling the current supplied to the discharge lamp (1) on the basis of the result of detection at the voltage detection circuit (3) and continuously increases the current supplied to the discharge lamp (1) at a predetermined rate of increase. Thus, a discharge lamp lighting device which is inexpensive and highly reliable and enables a longer lifetime of the discharge lamp (1) is provided.