| 摘要 |
A shadowless background board for photography, a subject to be photographed being placed in front of the board and being illuminated by light rays directed toward the board. The shadow cast on the board by the subject creates thereon a shadow zone bordered or surrounded by an illuminated region. The board is constituted by a translucent light-diffusing front panel behind which is a light distributor responsive to light rays inmpinging on the illuminated region on the panel and adapted to convey these rays to the shadow zone and thereby illuminate this zone. The light distributor is in the form of a light-conducting circuit matrix having a network of light-conducting lines, either end of each line functioning as a light input to the line or as an output therefore. The ends of the lines engage respective sites on an array thereof that is uniformly distributed throughout the rear surface of the translucent panel. The circuit arrangement is such that those light rays incident to sites lying within the illuminated region of the panel are picked up by line ends engaging these sites and are conveyed by the related lines to ends engaging sites lying within the shadow zone, thereby illuminating this zone and eliminating the shadow whereby the photograph taken of the subject is shadow free.
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