Light source device, projector, and driving method of discharge lamp

摘要

To prevent biased consumption of electrodes in a discharge lamp and to prevent biased precipitation of the electrode material, a light source is provided. The light source device has a discharge lamp that emits light by discharge between a first electrode and a second electrode; and a driver that supplies alternating current to the first and the second electrodes so as to maintain the discharge, and changes duty ratio of the alternating current in accordance with predetermined pattern. The predetermined pattern includes a plurality of section periods for which the duty ratio maintains mutually different values for a predetermined period.

主权项

1. A light source device comprising:
a discharge lamp that includes first and second electrodes configured to emit light by mutual discharge; and a driver configured to supply alternating current with the first and the second electrodes so as to maintain the discharge, and change duty ratio of the alternating current with a cyclical pattern in a steady operation, wherein
the cyclical pattern includes a plurality of section periods,the duty ratio is maintained constant for each of the plurality of section periods and becomes mutually different for at least two section periods of the plurality of section periods, andpolarity of the alternating current reverses between positive and negative a plurality of times for each of the plurality of section periods.