Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1995-12-15
1998-07-21
Lee, Helen
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525200, C08L 2712
Patent
active
057836361
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a graded-refractive-index optical plastic material (hereinafter sometimes referred to as optical plastic material for short) having high transparency and high heat resistance simultaneously, which conventional optical plastics hardly ever attained, and a method for its production.
The optical plastic material of the present invention may be a light transmission medium such as an optical fiber, or a body material of a light transmission medium such as a preform of an optical fiber.
A light transmission medium which is the optical plastic material of the present invention is free from light scattering and very transparent to light at wavelengths within a wide range from ultraviolet light to near infrared light, since it is made of an amorphous resin, therefore it is useful for optical systems for light of various wavelengths. In particular, the optical plastic material of the present invention provides a light transmission medium with small losses at wavelength of 1300 nm and 1550 nm, at which a trunk vitreous silica fiber is used in the field of optical communication.
A light transmission medium which is the optical plastic material of the present invention has heat resistance, chemical resistance, humidity resistance and nonflammability enough to withstand severe use conditions, for example, in an engine room of an automobile.
A light transmission medium which is the optical plastic material of the present invention is useful as various graded-refractive-index light transmission medium such as a graded-refractive-index optical fiber, a rod lens, an optical waveguide, an optical decoupler, a wavelength multiplexer, a wavelength demultiplexer, an optical attenuator, a light switch, an optical isolator, a light transmitting module, an light receiving module, a coupler, an optical deflector and an optical integrated circuit. Graded-refractive-index means a region wherein the refractive index of a light transmission medium varies continuously in a specific direction. For example, a graded-refractive-index optical fiber shows a refractive index profile that the refractive index parabolically decreases from the center of the fiber along the radii.
When the optical plastic material of the present invention is a body material-of a light transmission medium, it is spun, for example, by hot drawing to prepare a light transmission medium such as a graded-refractive-index optical fiber.
BACKGROUND ART
Heretofore, as resins for graded-refractive-index plastic light transmission medium, optical plastics represented by methyl methacrylate resins, tetrafluoroethylene resins disclosed in WO94/04949 and vinyl fluoride resins have been proposed.
With respect to stepped-refractive-index plastic optical fibers, many proposals have been made to use optical plastics such as a methyl methacrylate resin, a styrene resin, a carbonate resin and a norbornene resin for a core and a fluoropolymer cladding. Japanese Unexamined Patent Publication No. 244007/1990 proposes use of a fluoropolymer core and a fluoropolymer cladding.
The present invention provides an optical plastic material having heat resistance, humidity resistance, chemical resistance and nonflammability required for applications to an automobile, an office automation (OA) equipment, an electrical appliance and the like, which light transmission medium made of a methyl methacrylate resin or a norbornene resin have never attained.
Further, the object of the present invention is to provide a novel optical plastic material which is useful for ultraviolet light (wavelength from 200 nm to 400 nm) and near infrared light (wavelength from 700 nm to 2500 nm), which are unavailable to light transmission medium made of a methacrylate resin, a carbonate resin and a norbornene resin, and has low light transmission losses in a wide transmission zone and a method of its production.
DISCLOSURE OF INVENTION
The present inventors have conducted extensive researches taking the above-mentioned problems into consideration, and consequentl
REFERENCES:
patent: 4585306 (1986-04-01), Ohmori et al.
patent: 4754009 (1988-06-01), Squire
patent: 4935477 (1990-06-01), Squire
Koike Yasuhiro
Naritomi Masaki
Lee Helen
Yasuhiro Koike
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