公开(公告)号：US20090135480A1

公开(公告)日：2009-05-28

申请号：US12289282

申请日：2008-10-23

申请人： Kuniko Kojima ,  Hayato Takeuchi ,  Norihiro Watanabe ,  Yuzou Nakano ,  Takao Endo

发明人： Kuniko Kojima ,  Hayato Takeuchi ,  Norihiro Watanabe ,  Yuzou Nakano ,  Takao Endo

IPC分类号： G03B21/62 ,  G02B27/12

CPC分类号： G03B21/62 ,  G02B5/0215 ,  G02B5/0231 ,  G02B5/0278 ,  G02B5/045

摘要： The Fresnel lens sheet according to the present invention has a plurality of prismatic Fresnel lens elements including a Fresnel facet, a riser facet, and a top facet crossing the facet and the riser facet on an entrance surface. An angle of the top facet of each Fresnel lens element constituting the lens relative to the an exit surface, δ1, is determined so that an exit angle of the light that has entered each of the top facets and exits from the exit surface, β, is greater than 35 degrees.

摘要翻译： 根据本发明的菲涅耳透镜片具有多个棱镜菲涅耳透镜元件，其包括菲涅耳面，提升板面和顶面，其在入射面上与小平面和提升板面相交。 确定构成透镜的每个菲涅尔透镜元件相对于出射表面delta1的顶面的角度，使得已经进入每个顶面并从出射表面β射出的光的出射角， 大于35度。