| 摘要 |
A front projection screen includes a plane base layer forming plural parallel outward-protruded annular strips on the light-reflecting side surface thereof. Each strip contains an outside surface (4) facing the projection light source and being a light-reflecting portion, and an outside surface (3) not facing the projection light source and being a stray-light absorbing portion. The two surfaces intersect each other. All bottom interfaces between the strips and the base layer are in a common plane. All outside surfaces (4) of these strips have a common focus point. The outside surface (3) is arranged in such a manner that the outside surface (4) of each strip does not block the projection light incident on the whole outside surface (4) of its adjacent strip.
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