RETROREFLECTIVE MATERIAL AND OBJECT DETECTION METHOD

To provide a retroreflective material capable of specifying a direction in which an operator is present.SOLUTION: A retroreflective material controls a wavelength of reflected light using a multilayer film 20 to increase reflectance of light of a desired wavelength in an invisible light region. The...

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Bibliographic Details
Main Authors OMACHI SHINICHI, TANAKA SHUJI, ISHIDA KAZUYA
Format Patent
LanguageEnglish
Japanese
Published 07.10.2021
Subjects
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
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Summary:To provide a retroreflective material capable of specifying a direction in which an operator is present.SOLUTION: A retroreflective material controls a wavelength of reflected light using a multilayer film 20 to increase reflectance of light of a desired wavelength in an invisible light region. The retroreflective material has glass beads 10 to be retro-reflected and a multilayer film 20 formed on part of a surface of the glass beads 10. The multilayer film 20 is formed so as to have an increased reflectance of ultraviolet rays or infrared rays, and has 80% or more reflectance of a light beam of a wavelength 800 nm to 1200 nm. Also, the retroreflective material is transparent or translucent.SELECTED DRAWING: Figure 2 【課題】作業者のいる方向を特定することができる再帰反射材を提供する。【解決手段】再帰反射材は、多層膜２０を用いて反射光の波長を制御し不可視光領域の目的とする波長の光の反射率を高めた反射材である。再帰反射材は、再帰反射するガラスビーズ１０と、ガラスビーズ１０の表面の一部に形成された多層膜２０とを有する。多層膜２０は、紫外線又は赤外線の反射率が高くなるように形成され、波長８００ｎｍ〜１２００ｎｍの光線の反射率が８０％以上となっている。また、再帰反射材は、透明又は半透明である。【選択図】図２
Bibliography:Application Number: JP20200057941