| 摘要 |
<p>PURPOSE:To mold a high-grade resin concave lens free from a weld line by injecting molten resin material into a mold moving the injection hole continuously along the peripheral direction. CONSTITUTION:A movable slider 4 is provided on the runner between the mold section 8 and the gate 7. Thereby, molten resin material supplied from the gate 7 is injected into the mold section 8 moving the injection hole 13 at the end of the injection slider 4 continuously along the peripheral direction.</p> |
