METHOD FOR MANUFACTURING MOLD AND PLANAR MEMBER FOR OPTICS

PROBLEM TO BE SOLVED: To provide a mold capable of efficiently molding a planar member for optics (a light diffusion plate, a light guide plate and the like) excellent in optical performance. SOLUTION: A core plate 11 with a cavity face 11A, a gate bush 100 inserted into an inserting hole 11B formed at the core plate 11 and having a gate 12 communicating with the cavity face 11A, a hot runner 300 held by the gate bush 100 and feeding a molten resin through the gate 12, a core plate temperature detecting means 114, a gate bush temperature detecting means 112, a core plate temperature adjusting means 520, a gate bush temperature adjusting means 530, and a control means 500 for controlling the core plate temperature adjusting means 520 and the gate bush temperature adjusting means 530 so that when the temperature detected by the gate bush temperature detecting means 112 is Tbu and the temperature detected by the core plate temperature detecting means 114 is Tca, they are within a range of -20°C≤Tbu-Tca≤15°C are provided. COPYRIGHT: (C)2010,JPO&INPIT