Patent ID: 8142706

Claim:
A method for injection molding a product having a hydrophobic pattern comprising the steps of: heating a fixed mold unit having a cavity using a heater mounted on the fixed mold unit and a movable mold unit with a stamper with a hydrophobic pattern formed thereon mounted thereto using a heater mounted on the movable mold unit so that temperature of the fixed mold unit and the movable mold unit is between 180° C. to 200° C.; bringing the movable mold unit with the stamper mounted thereto into close contact with the fixed mold unit for enclosing an inside of the molds so that the cavity is closed; injecting a predetermined resin material into the inside of the fixed mold unit and the movable mold unit; and cooling down the fixed mold unit and the movable mold unit, and separating the fixed mold unit and the movable mold unit wherein cooling down the fixed mold unit and the movable mold unit comprises bringing a cooling mold with a second magnet toward the movable mold unit with a first magnet by magnetic force between the first magnet and the second magnet so that the cooling mold and the movable mold unit are brought into contact with each other, wherein the cooling mold is guided by a guide member in the movable mold unit for guiding movement of the cooling mold.