| 摘要 |
A filter for blocking out harmful solar radiation for direct viewing or for photographic purposes employs a plurality of flexible, transparent resin film layers which are coated with metal to achieve optical clarity and to effectively shield the user from most of the sun's energy while allowing enough light to pass through the filter. The total thickness of the resin material is not more than approximately 0.002 inch, and the total thickness of the metal on the film layers provides an opaqueness to allow passage of approximately 0.01 percent sunlight.
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