Optical fiber ribbon and optical fiber cable housing optical fiber ribbon

Abstract

Provided is an optical fiber ribbon capable of achieving higher density and reduction in diameter and accurately placing optical fibers in V-shape grooves in a fusion machine without failure. The optical fiber ribbon 1 includes three or more of optical fibers 2 arranged in parallel and connecting portions 3 connecting adjacent two optical fibers 2 together, the connecting portions 3 being intermittently provided in each of a ribbon longitudinal direction and a ribbon width direction. The connecting portions 3 are each formed in such a manner as to fill resin into a gap S formed between adjacent two optical fibers 2 , and both surfaces of the respective connecting portions 3 are each formed into a recess having a concave shape curved toward a center of the gap S to separate from lines 4,5 each connecting contact points of the optical fibers 2 when being placed on a horizontal surface.

1 . An optical fiber ribbon comprising three or more of optical fibers arranged in parallel and connecting portions connecting adjacent two optical fibers together, the connecting portions being intermittently provided in each of a ribbon longitudinal direction and a ribbon width direction,
 wherein a gap is formed between adjacent two optical fibers, the connecting portions are each formed in such a manner as to fill resin into the gap, and both surfaces of the respective connecting portions are each formed into a recess having a concave shape curved toward a center of the gap to separate from lines each connecting contact points of the optical fibers when being placed on a horizontal surface.   
     
     
         2 . The optical fiber ribbon according to  claim 1 , wherein an outer diameter dimension of the optical fibers is set to smaller than or equal to 220 μm, and a distance between centers of the adjacent two optical fibers is set to 250 μm with a margin of plus or minus 30 μm. 
     
     
         3 . The optical fiber ribbon according to  claim 1 , wherein an outermost layer of the respective optical fibers is colored. 
     
     
         4 . An optical fiber cable housing the optical fiber ribbon according to  claim 1  therein. 
     
     
         5 . An optical fiber ribbon comprising three or more of optical fibers arranged in parallel and connecting portions connecting adjacent two optical fibers together, the connecting portions being intermittently provided in each of a ribbon longitudinal direction and a ribbon width direction,
 wherein a gap if formed between adjacent two optical fibers, the connecting portions are each formed in such a manner as to fill resin into the gap and cover a periphery of the respective optical fibers with the resin, and both surfaces of the respective connecting portions are each formed into a recess having a concave shape curved toward a center of the gap to separate from lines each connecting contact points of the optical fibers when being placed on a horizontal surface.   
     
     
         6 . The optical fiber ribbon according to  claim 5 , wherein an outer diameter dimension of the optical fibers is set to smaller than or equal to 220 μm, and a distance between centers of the adjacent two optical fibers is set to 250 μm with a margin of plus or minus 30 μm. 
     
     
         7 . The optical fiber ribbon according to  claim 5 , wherein a resin thickness of the periphery covered with the resin is set to smaller than or equal to 15 μm. 
     
     
         8 . The optical fiber ribbon according to  claim 5 , wherein an outermost layer of the respective optical fibers is colored.