MOLD AND MANUFACTURING METHOD OF OPTICAL FLAT PLATE MEMBER

PROBLEM TO BE SOLVED: To provide a mold capable of efficiently molding a flat plate molded product superior in optical capacity. SOLUTION: An injection mold 2 is equipped with a fixed mold 6 and the movable mold 4 advanced to and retracted from the fixed mold 6. The fixed mold 6 is equipped with a mold base part 7 and the core plate 11 which is arranged on the surface of the mold base part 7, has a cavity surface 11A, and keeps a plurality of the gates 12 arranged to communicate with the cavity surface. A hot runner part 13 having the hot runner 13A communicating with the gates 12 to supply a resin P is provided to the mold base part 7 and equipped with the gate bushes 100 arranged to the peripheries of the respective gates 12 in the core plate 11 and the hot runner main body 300 the leading end of which is inserted in the respective gate bushes 100 to hold the resin to a molten state. The heat conductivity of the gate bushes 100 is 35 (W/m-K) or above and higher than that of the core plate 11. COPYRIGHT: (C)2009,JPO&INPIT