| 摘要 |
PROBLEM TO BE SOLVED: To provide a front cover the surface damages of which can be prevented effectively, whose manufacturing economics is enhanced and which is low-cost. SOLUTION: The front cover structure is provided with a rigid prism plate 12, in which many fine prisms in a cross-sectional saw-tooth shape are formed in parallel only on the rear except the surface. The structure is provided with a soft prism plate 13, in which many fine prisms in a cross-sectional saw-tooth shape, formed of vertical faces and slopes are formed in parallel, only on the surface except the rear and in which light absorption layers are formed to the vertical faces of the fine prisms. In the structure, the rear of the soft prism plate 13 is brought into contact with the surface of the rigid prism plate 12.
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