Patent ID: 8729831
Filing Date: 2014-05-20
Classification: H05B

Abstract:
1. A light source apparatus comprising: a gas discharge tube; a trigger power source unit configured to apply a predetermined voltage so that the applied voltage to the gas discharge tube reaches a voltage at which electric discharge is started in the gas discharge tube when the gas discharge tube is lit; a trigger switch for switching on and off the application of the voltage from the trigger power source unit to the gas discharge tube; a constant-current power source unit connected to the gas discharge tube for applying a voltage to the gas discharge tube and performing the constant-current control of an electric current flowing in the gas discharge tube, the constant-current power source unit having a variable power source which is configured to adjust the voltage applied to the gas discharge tube; a voltage detection unit for detecting the voltage applied to the gas discharge tube; and a power source controlling unit configured to control the voltage by adding a predetermined voltage to the voltage taken in from the voltage detection unit after the electric discharge is started in the gas discharge tube.