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FRESNEL LENS SHEET FOR CONDENSING IMAGING LIGHT OBLIQUELY PROJECTED FROM PROJECTOR, PROCESS OF PRODUCING FRESNEL LENS SHEET, MOLD FOR PRODUCTION PROCESS, AND REAR PROJECTION SCREEN INCLUDING FRESNEL LENS SHEET
FRESNEL LENS SHEET FOR CONDENSING IMAGING LIGHT OBLIQUELY PROJECTED FROM PROJECTOR, PROCESS OF PRODUCING FRESNEL LENS SHEET, MOLD FOR PRODUCTION PROCESS, AND REAR PROJECTION SCREEN INCLUDING FRESNEL LENS SHEET
PURPOSE: A Fresnel lens sheet for condensing imaging light obliquely projected from a projector, a process of producing a Fresnel lens sheet, a mold for production process, and a rear projection screen including a Fresnel lens sheet are provided to form a mold of a specific shape and form the Fresnel lens sheet the released from the mold by controlling curves of tips of angular protrusions of the mold. CONSTITUTION: A Fresnel lens sheet includes a base(1a) of a sheet form and a plurality of prisms(2). The prisms are formed on an incident side of the base. Each of the prisms has a refraction plane(3) for refracting the projected light and a total reflection plane(4) for reflecting totally at least part of the light refracted at the plane of refraction toward the viewer's side. Each root(5) defined by the refraction plane of one prism and the total reflection plane of another prism is curved toward another prism side from the one prism side.
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