| 摘要 |
An optical member 7 is bonded, at its rear side 7 b, to a holographic stereogram 6 . The front side 7 a of the optical member 7 consists of parallel triangular prisms. Illumination light 9 is applied to the front surface 7 a of the optical member 7 at a predetermined angle of, for example, 60°. The optical member 7 is made of, for example, optical glass or transparent plastic. Each triangular prism has an incidence surface 8 , to which the illumination light is applied at right angles. The illumination light is applied to the interface 22 between the optical member 7 and the holographic stereogram 6 , at an incidence angle theta of, for example, 60°, thereby to suppress surface reflection of the illumination light 9 at the interface 22.
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