JP2005164714A5 - - Google Patents

Claims (4)

A multi-core plastic optical fiber in which seven or more core fibers are bundled, wherein the core is made of polymethyl methacrylate or a copolymer of at least one vinyl monomer and methyl methacrylate; A clad composed of at least one layer disposed on the outer periphery of the clad, wherein the outermost layer of the clad is composed of 1 to 30% by mass of vinylidene fluoride units, 30 to 85% by mass of tetrafluoroethylene units, and the following general formula (I)
<Formula 1>
_{CF 2 = CF- (OCF 2 CF} (CF 3)) a O-Rf 2 (I)
(In the formula, Rf ₂ represents an alkyl group having 1 to 8 carbon atoms, a fluoroalkyl group, an alkoxylalkyl group or a fluoroalkoxylalkyl group, and a is an integer of 0 to 3.)
A multi-core plastic optical fiber comprising a copolymer containing 3 to 40% by mass of a unit of a fluorovinyl compound represented by the formula: The clad has a two-layer structure in which the first clad and the second clad are laminated in this order on the outer periphery of the core,
When the refractive index of the core at 25 ° C. by the sodium D line is n ₁ , the refractive index of the first cladding is n ₂ , and the refractive index of the second cladding is n ₃ , n ₁ , n _2, and n ₃ are Relational expression (1)
<Equation 1>
n ₁ > n ₂ > n ₃ (1)
The multi-core plastic optical fiber according to claim 1, wherein: Wherein the outer peripheral portion of the outermost layer of the cladding, a multi-core plastic optical fiber according to claim 1 or 2 characterized in that a protective layer made of a fluorine-based resin containing fluorine atoms 59 mass% or more. A multi-core plastic optical fiber cable comprising at least one coating layer made of a thermoplastic resin on an outer periphery of the multi-core plastic optical fiber according to any one of claims 1 to 3 .