| 摘要 |
A projection device includes an image source unit, a first projecting optical system, an intermediate optical system, and a second projecting optical system. The image displaying area of the image source unit is tilted with respect to a first virtual plane, and an intermediate image is tilted with respect at least the first virtual plane. A following relationship is satisfied: <maths id="MATH-US-00001" num="1"> <MATH OVERFLOW="SCROLL"> <MROW> <MROW> <MO>-</MO> <MN>1</MN> </MROW> <MO>></MO> <MFRAC> <MROW> <MI>tan</MI> <MO></MO> <MSTYLE> <MTEXT> </MTEXT> </MSTYLE> <MO></MO> <MI>theta2</MI> </MROW> <MROW> <MI>tan</MI> <MO></MO> <MSTYLE> <MTEXT> </MTEXT> </MSTYLE> <MO></MO> <MI>theta1</MI> </MROW> </MFRAC> <MO>></MO> <MFRAC> <MROW> <MI>f</MI> <MO></MO> <MSTYLE> <MTEXT> </MTEXT> </MSTYLE> <MO></MO> <MN>1</MN> </MROW> <MROW> <MFRAC> <MI>H</MI> <MN>2</MN> </MFRAC> <MO></MO> <MI>sin</MI> <MO></MO> <MSTYLE> <MTEXT> </MTEXT> </MSTYLE> <MO></MO> <MI>theta1</MI> </MROW> </MFRAC> </MROW> </MATH> </MATHS> where, f1 denotes a focal length of the first projecting optical system, theta1 denotes a tilt angle of the image display surface of the image source unit with respect to the first virtual plane, H represents a length of the image source unit which corresponds to the image projected on the screen in the vertical direction, and theta2 denotes a tilt angle of the intermediate image with respect to the first imaginary surface.
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