Abstract: Disclosed herein a discharge lamp lighting device capable of suppressing an occurrence of a flicker and obtaining a longer life till flicker even when the discharge lamp lights up for a long time. The device comprises a short arc type discharge lamp; a lighting circuit for supplying power to the discharge lamp; and a controller for controlling the lighting circuit. The discharge lamp has: an arc tube; an anode and a cathode disposed in the arc tube with the anode and the cathode facing each other; and a xenon gas enclosed in the arc tube, and the cathode includes an electron emissive material and a carbon component. The controller includes a short time lighting circuit for carrying out a short time lighting operation that lights up the discharge lamp at least once in a short time during an idle period in which the discharge lamp does not constantly light up.

Abstract: A discharge lamp operating apparatus including: a discharge lamp; an operating circuit; a voltage measuring unit; a magnetic field applying unit; and a control unit, wherein the voltage measuring unit measures the voltage of power at sampling intervals, the control unit calculates an average value VL1 of a group of the measured value of the voltage as a standard and an average value VL2 of a group of the measured value of the voltage for comparison after a predetermined time has elapsed from the measurement of the measured value of the voltage measured at the beginning from the group of the measured value of the voltage as a standard, and when the difference (VL2?VL1) between the average value VL1 and the average value VL2 exceeds a predetermined value, drives the magnetic field applying unit.

Abstract: A discharge lamp operating apparatus including: a discharge lamp; an operating circuit; a voltage measuring unit; a magnetic field applying unit; and a control unit, wherein the voltage measuring unit measures the voltage of power at sampling intervals, the control unit calculates an average value VL1 of a group of the measured value of the voltage as a standard and an average value VL2 of a group of the measured value of the voltage for comparison after a predetermined time has elapsed from the measurement of the measured value of the voltage measured at the beginning from the group of the measured value of the voltage as a standard, and when the difference (VL2?VL1) between the average value VL1 and the average value VL2 exceeds a predetermined value, drives the magnetic field applying unit.

Abstract: A xenon short-arc lamp includes an arc tube containing a first electrode and a second electrode, sealing tubes on both edges of the arc tube and supporting tubes that are supported in the sealing tubes. Core rods of the first electrode and the second electrode are inserted through and supported by the supporting tubes. A high alternating voltage is applied at the start of the lighting. A trigger wire that is electrically connected to the first electrode is wound around an outer surface of the second electrode side sealing tube at an arc tube side position other than a location of the sealing tube that faces the metal foil. The trigger wire may be wound around an rising part of the arc tube.

Abstract: A discharge lamp with a high output power in which an increase of the current to be supplied to the discharge lamp can be enabled without the need to enlarge the discharge lamp and the surrounding system. The discharge lamp includes an arc tube having a pair of opposed electrodes, at least one of the electrodes having an electrode body in which a hermetically sealed interior space is formed, and a heat conductor partially filling the hermetically sealed interior space. This heat conductor consists of metal that has a higher thermal conductivity or a lower melting point than the metal comprising the electrode body.

Abstract: A discharge lamp with a high output power in which an increase of the current to be supplied to the discharge lamp can be enabled without the need to enlarge the discharge lamp and the surrounding system. The discharge lamp includes an arc tube having a pair of opposed electrodes, at least one of the electrodes having an electrode body in which a hermetically sealed interior space is formed, and a heat conductor partially filling the hermetically sealed interior space. This heat conductor consists of metal that has a higher thermal conductivity or a lower melting point than the metal comprising the electrode body.