| 摘要 |
PROBLEM TO BE SOLVED: To prevent light of a fluorescent lamp from appearing in relief like a stripe pattern and to reduce the thickness of an internally illuminated sign by using a light quantity adjustment film for limiting direct radiation with the fluorescent lamp. SOLUTION: A box-shaped internally illuminated signboard 1 of double-sided light emission type incorporates fluorescent lamps 2, and the light quantity adjustment film is used for this sign 1. The film is made of a cylindrical transparent sheet 3, and the transparent sheet 3 is provided with light diffusion preventive materials in the vicinity of fluorescent lamps on both sides of the signboard where characters and patterns are drawn. The light diffusion preventive materials are constituted of many fine wire aluminum-deposited surfaces, fine wire-shaped, net-shaped, or grid-shaped printed surfaces, or their combinations. COPYRIGHT: (C)2005,JPO&NCIPI
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