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公开(公告)号：US12031281B2
公开(公告)日：2024-07-09
申请号：US17603610
申请日：2019-04-15
发明人： Yuto Usui , Kodai Hatakeyama , Tatsuya Yamazaki , Yukihiro Shibao
摘要： A vision guide with a light guiding rod including rope member formed by twisting plural strands; light guiding rod of circumferentially light emitting type being adheringly wound around spiral indentations formed between strands on outer circumference of rope member with core layer made of acrylic-based resin and clad layer made of fluorine-based resin; and light source attached to end portion of light guiding rod, wherein amount of change luminance of light guiding rod in test time over duration of 1000 hours by accelerated weathering tester is contained within range of ±10%; amount of change in each numerical value of chromaticity [x, y] is contained within range of ±0.02; flexural modulus of elasticity of light guiding rod under atmosphere of −20 degrees Centigrade is contained at range of 0.5-5.0×103 MPa; rope member is formed by twisting strands at twisting angle from 10°-20°; and spiral indentations are uniformly formed with pitch from 100 mm-200 mm.
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