Plastic optical fiber and process for producing the same
First Claim
1. A plastic optical fiber comprising polycarbonate as its core material and a polymer, as its cladding material, having a refractive index lower than that of the core material, which is formed by a melt-spinning step, wherein said core material of polycarbonate is supplied to the melt-spinning step in the form of a powder which has not been heated to a temperature exceeding its crystalline melting point at any step other than the melt-spinning step, wherein the relationship between light transmission loss, L500 (dB/km), of said fiber as measured at a wavelength of 500 nm and light transmission loss, L660 (dB/km), of said fiber measured at a wavelength of 660 nm is expressed by the following relation (I):
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space="preserve" listing-type="equation">L.sub.500 <
L.sub.660 +4,000 dB/km (I).
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Accused Products
Abstract
A plastic optical fiber which is superior in the light transmission characteristics, particularly in those within a visible light region and also superior in heat resistance, and a process for producing the same are provided, which plastic optical fiber comprises a polycarbonate as its core material and a polymer as its cladding material having a refractive index lower than that of the core material, wherein the relationship between the light transmission loss L500 (dB/km) of the fiber as measured at a wavelength of 500 nm and that as measured at 660 nm being expressed by the following inequality:
L.sub.500 <L.sub.660 +4,000.
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Citations
13 Claims
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1. A plastic optical fiber comprising polycarbonate as its core material and a polymer, as its cladding material, having a refractive index lower than that of the core material, which is formed by a melt-spinning step, wherein said core material of polycarbonate is supplied to the melt-spinning step in the form of a powder which has not been heated to a temperature exceeding its crystalline melting point at any step other than the melt-spinning step, wherein the relationship between light transmission loss, L500 (dB/km), of said fiber as measured at a wavelength of 500 nm and light transmission loss, L660 (dB/km), of said fiber measured at a wavelength of 660 nm is expressed by the following relation (I):
space="preserve" listing-type="equation">L.sub.500 <
L.sub.660 +4,000 dB/km (I).- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A process for producing a plastic optical fiber by a melt-spinning step, wherein polycarbonate is used as the core material of the fiber and a polymer having a refractive index lower than that of the core material is used as the cladding material thereof;
- wherein the core material of polycarbonate is supplied to the melt-spinning step in the form of a powder which has not been heated to a temperature exceeding its crystalline melting point at any preceding step other than the melt-spinning step, and then, melted at a temperature exceeding its crystalline melting point in the melt-spinning step.
- View Dependent Claims (13)
Specification