| 摘要 |
A projector 100 includes an image projection unit 6 that projects an image using light from a discharge lamp 1, a ballast 2 that controls a supply voltage supplied to the discharge lamp 1, a system controller 3 that controls a command signal outputted to the ballast 2, a volatile memory 31, a nonvolatile memory 32 that stores data stored in the volatile memory 31, and a power supply unit 4 that includes a capacitor 48 used for generating a supply voltage supplied from an external power supply to the ballast 2. The system controller 3 stores the data of the volatile memory 31 in the nonvolatile memory 32 using a voltage generated by accumulated charges of the capacitor 48 when the external power supply is cut off.
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