| 摘要 |
<p>PURPOSE: A front projection screen and a projection system with the same are provided to form a lens unit by using a black resin, thereby preventing the degradation of a contrast ratio caused by lights being incident to areas except for a reflecting surface. CONSTITUTION: A front projection screen comprises a base unit(110) and a fresnel lens unit(120). The fresnel lens unit comprises a reflecting surface and a non-reflecting surface diffusing and reflecting lights on one surface of the base unit. Fresnel lenses having a triangular cross section are arrayed into a concentric circle, thereby forming the fresnel lens unit. An inclined angle of the reflecting surface is varied by corresponding to a vertical distance between the center of the reflecting surface and a projector and a vertical viewing range.</p> |
