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Optical transmission tube, making method, and linear illuminant system
| Details |
Inventors: Sugiyama, Hideo; Sugimachi, Masato; Ishiharada, Minoru; Morimura, Yasuhiro; Terahama, Tatsuo; Fukuyama, Hiroshi; Tanuma, Itsuo;
Assignee: Bridgestone Corporation (Tokyo, JP)
Primary Examiner: Palmer; Phan T. H.
Assistant Examiner:
Attorney, Agent or Firm: Sughrue, Mion, Zinn, Macpeak & Seas, PLLC
In an optical transmission tube comprising a tubular cladding and a core within the cladding having a higher index of refraction than the cladding, a strip-shaped reflecting layer is longitudinally extended between the cladding and the core. Light passing through the core is reflected and scattered by the reflecting layer to emerge from the tube through an area of the outer surface of the cladding opposed to the reflecting layer. The optical transmission tube is prepared by dispersing scattering particles in a monomer solution; filling a tubular cladding with the monomer solution; resting the cladding horizontally for allowing the scattering particles to settle on a lower inner surface of the cladding; and thereafter, causing the monomer solution to polymerize and solidify within the cladding. |
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DETAILED DESCRIPTION An object of the invention is to provide an optical transmission tube allowing directional emergence of light from one side or an outer surface area thereof at a high luminance.
Another object of the invention is to provide a method for preparing the optical transmission tube.
A further object of the invention is to provide a linear illuminant system which can be used in water, at places where rain or snow reaches, or in an environment with the risk of explosion, which requires only a low power to produce sufficient side light emergence, and which is compact so that it may be installed at any desired place.
In a first aspect, the invention provides an optical transmission tube comprising a tubular cladding having an outer surface and a core within the cladding having a higher index of refraction than the cladding.
A reflecting layer in a strip form extends between the cladding and the core and longitudinally of the cladding.
Light passing through the core is reflected and scattered by the reflecting layer to exit from the tube through an area of the outer surface of the cladding that is opposed to the reflecting layer.
In a second aspect, the invention provides a method for preparing an optical transmission tube, comprising the steps of dispersing scattering particles in a core-forming solution comprising a monomer capable of forming a core upon polymerization; filling a tubular cladding with the scattering particle-dispersed core-forming solution; resting the tubular cladding horizontally for allowing the scattering particles to settle on a lower inner surface of the cladding; and thereafter, causing the core-forming solution to polymerize and solidify within the cladding, thereby forming a solid core within the cladding and forming a reflecting layer composed of the scattering particles in a strip form extending between the cladding and the core and longitudinally of the cladding.
In a third aspect, the invention provides a method for preparing an optical transmission tube using a three-color extruder having three screw sections and two concentric dies
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