| 摘要 |
There is provided a projection device having an optical projection system, a curved mirror, a screen, and a light guiding unit. A cross sectional shape of the curved mirror in an X-Z plane has a negative power, and the curved mirror is fixed to the projection device through at least one predetermined fixing point. A cross sectional shape of the curved mirror in an X-Y plane including a deformation reference point defined based on the at least one fixing point has its maximum negative power in a vicinity of the deformation reference point. A sag amount x=f(y) defined in an x-y coordinate having an origin point at the deformation reference point in the X-Y plane satisfies a following expression: <?in-line-formulae description="In-line Formulae" end="lead"?>for ymax/2<=Y<=Ymax,<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>|f''(ymax)|<=|f''(y)|<=|2f''(ymax)|<?in-line-formulae description="In-line Formulae" end="tail"?>
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