| 摘要 |
PURPOSE:To easily mold a mirror without inner skew by providing air holes which are opening with predetermined area and a communicating hole for making the air holes communicated on an outside of a transferring face of a molding face and generating a sink mark of a molding material at an air hole section corresponding to the air holes. CONSTITUTION:On a side wall of a mold base, an air hole 18 and a bypass 19 for making the air hole 18 communicated are provided. At filling of a melted resin R, the air contacts with an air hole section gamma' corresponding to the air holes 18, 18a of the resin R and a predetermined air pressure which is compressed and is filling the bypass 19 is given to the air hole section uniformly through the air holes 18, 18a. As the air pressure is not given to a mirror gammacorresponding to a molding face including a transferring face of the resin R, a pressure difference generates between the air hole section gamma' and the mirror gamma. When the melted resin R starts to solidify and shrink, in order that the mirror gammaleaves the molding face, the mirror gamma is to be separated by resisting vacuum pressure in its space, whereas the air hole section gamma' gives the air pressure through the air holes 18, 18a, so that the air can enter easily and a sink mark occurs at the air hole section gamma' as the solidification delays. |
