Abstract: A method for producing a coupler based on fiber-fused connection enabling simple, rapid production of a coupler no matter how many optical fiber core lines may be involved or no matter how small their diameter may be, comprises placing a plurality of optical fiber cords 1, 2 in parallel which comprise optical fiber core lines 3, 4 covered with jackets 7, 8 with resilient fibers 5, 6 inserted between the periphery of the core lines and the jackets; cutting a specified point of the jacket of each optical fiber core line to divide the jacket into two limbs; sliding the divided limbs (9, 9′ and 10, 10′) of the jackets in opposite directions to expose thereby sections of the underlying optical fiber core lines, the exposed sections of optical fibers being brought into contact with each other, and heated to melt to form thereby a fusion-connected section 11; sliding back each jacket limb close to the fusion-connected section; and placing the fusion-connected section 11 together with the inward ends of j

Abstract: A method for producing an optical fiber cord or an optical fiber cord tape, making it possible to produce optical fiber cords or optical fiber tape cords of large or small bores in a highly efficient manner, comprises the steps of placing a replaceable line 2 at the center, arranging resilient fibers 3 around its periphery, and covering the assembly with a jacket 4, to produce a dummy cord 1; exposing, at both ends of dummy cord 1, the ends of replaceable line 2 and of resilient fibers 3 from the ends of jacket 4; connecting one exposed end of replaceable line 2 with an optical fiber core line 5 or a unit core line 7 of an optical fiber tape cord; and replacing the replaceable line 2 in dummy cord 1 with the optical core line 5 or unit core line 7.

Abstract: The object of this invention is to provide a method for producing a coupler based on fiber-fused connection which will enable simple, rapid production of a coupler in a highly productive manner, no matter how many optical fiber core lines may be involved or no matter how small their diameter may be.

Abstract: This invention aims at providing a method for producing an optical fiber cord or an optical fiber cord tape, whereby it is possible to produce optical fiber cords or optical fiber tape cords in a highly efficient manner, whether their bore is large or small.

Abstract: A color toner comprising (A) a resin binder comprising a polyester, as a main component, obtained by polycondensing a polyhydric alcohol component and a carboxylic acid component, wherein the polyhydric alcohol component comprises a compound represented by the formula (I): wherein R.sup.1 is an alkylene group having 2 to 4 carbon atoms; x and y are positive numbers, wherein a sum of x and y is from 1 to 16, in an amount of 5% by mol or more of an entire polyhydric alcohol component, and wherein the carboxylic acid component comprises 50% by mol or more of a dicarboxylic acid compound and 50% by mol or less of a tricarboxylic or higher polycarboxylic acid compound; (B) a releasing agent having an average diameter size of dispersed particles in the color toner of from 0.1 to 3 .mu.