Patent ID: 7885003

Claim:
An optical deflecting sheet for use in a transmission type screen that emits imaging light projected from an incident side to an emergent side, comprising: a highly rigid substrate layer with a light-transmissibility and a high rigidity; and two or more layers laminated on the highly rigid substrate layer, the layers including at least a pair of anti-scattering layers disposed on opposite sides of the highly rigid substrate layer for preventing scattering of the highly rigid substrate layer; wherein at least one layer of the two or more layers includes an optical deflecting element that deflects imaging light by refracting or reflecting the imaging light; wherein the highly rigid substrate layer is formed of glass or translucent ceramic; wherein the optical deflecting element is a prism part formed by arranging a plurality of unit prisms each having an incident surface on which light is incident and a total reflecting surface for reflecting at least a part of light incident on the incident surface; and wherein at least another layer, that is different from the one layer of the two or more layers, includes an optical diffusing element that diffuses imaging light incident thereon, and the optical diffusing element is formed by arranging a plurality of unit optical shape portions each having a total reflecting surface that totally reflects at least a part of imaging light incident thereon.