| 摘要 |
A safety visor is produced by etching of metal and comprises a grid which defines a large number of light-permeating holes (7, 8, 9). The safety visor has at least two zones (2, 3, 4) where the holes (7, 8, 9) are of different areas and/or configuration. An upper central zone (2) has greater light transmission than the remaining zones (2, 4) of the safety visor. The C-C spacing for the holes (7, 8, 9) is constant in both the vertical and lateral directions regardless of in which region of the safety visor the holes (7, 8, 9) are located. In one preferred embodiment, the holes (7, 8, 9) are hexagonal with two approximately parallel sides which are longer than the remaining sides and are directed in the vertical direction of the safety visor.
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