| 摘要 |
There is provided a rear projection screen having a larger viewing angle in a diagonal direction than those in other directions in use. In a fly-eye lens having a plurality of lens units, a lens boundary where lens units adjoin each other has a rectangular shape analogous to an external form of the fly-eye lens and when image light parallel to a direction of an optical axis of the lens unit is incident on a lens face of the lens unit in using the fly-eye lens while orienting a short side of the rectangle in the vertical direction, a diffusion angle of the image light outgoing from the lens unit is larger in a diagonal direction of the rectangle of the external form of the fly-eye lens than those in the horizontal and vertical directions.
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