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AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsMakoto Kai, Makoto Horiuchi, Mamoru Takeda, Takeharu Tsutsumi, Toshiaki Ogura
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An image projector has a lamp unit 23 having a high-pressure mercury vapor discharge lamp 21 and a parabolic mirror 22. To the high-pressure mercury vapor discharge lamp 21, a driving system 24 applies an alternating voltage such that wandering of a cathode luminescent spot generated in the vicinity of a tip of each of the discharge electrodes of the high-pressure mercury vapor discharge lamp 21 is suppressed, the frequency being within the range of 20-42 kHz. This construction allows to prevent flicker in a projected image of a liquid crystal projector and the like, and therefore achieves high quality in the projected image.
A method for driving a high-pressure mercury vapor discharge lamp comprising in an arc tube a pair of discharge electrodes opposed to each other, said lamp wherein at least mercury and a rare gas are enclosed in the arc tube, comprising:
A driving system for a high-pressure mercury vapor discharge lamp comprising in an arc tube a pair of electrodes opposed to each other, said lamp wherein at least mercury and a rare gas are enclosed in the arc tube, said driving system operating said lamp by applying an alternating voltage between the discharge electrodes, wherein:
Dependencies are inferred from the claim text.