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AssigneeDai Nippon Printing Co., Ltd.
InventorsMasahiro Goto, Hitomu Watanabe, Yoshiki Yoshida, Hiroshi Sekiguchi
Estimating the term…
A projection screen 111 comprises a total reflection prism lens 114 and a lenticular lens 115 provided on the viewer's side of the total reflection prism lens 114. The total reflection prism lens 114 has a plurality of unit prisms 113 on its back surface (the outermost plane of incidence) on which imaging light L is incident. Each unit prism 113 has an apical angle λ that corresponds to the angle between the plane of incidence 113a and the plane of total reflection 113b, and the apical angles λ of the unit prisms 113 vary with the position of each unit prism 113 on the screen plane. In particular, the unit prisms 113 have apical angles λ varying continuously from 30° to 45° so that the apical angles λ on the side distant from the center O of the concentric circles are greater than the apical angles λ on the side close to this center O.
A projection screen that allows imaging light obliquely projected from a projection optical system placed at a rear side of the projection screen to emerge toward a viewer's side of the projection screen, comprising:
A total reflection prism sheet for use in a projection screen that allows imaging light obliquely projected from a projection optical system placed at a rear side of the projection screen to emerge toward a viewer's side of the projection screen, comprising:
Dependencies are inferred from the claim text.