| 摘要 |
An optical component (11) comprises two transparant flat bodies (12,13) each having grooves (16) or other urface features on one of its faces (15) which interpenetrate when the two bodies (12,13) are placed fac-to face. The shapes of the grooves (16) or other surfaces features are such that they touch in some places (20, 22, 23) and are spaced from one another in others (18, 19) to form voids (24) within the composite body (11) so formed. These cavities (24) assist in determining total internal reflection of incident light at certain angles. Composites bodies formed from two face-to face optical components may be used as daylightind screens both to direct light towards an objectsuch as the interior of a building (through an opening) or to screen light from it by diverting it away therefrom.
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