Injection mold

An injection mold comprising:

• a first mold part provided with a first mold surface;
• a second mold part provided with a second mold surface to form a cavity together with the first mold surface;
• pipes installed in at least one of the first mold part and the second mold part, each of the pipes being provided with a cooling path formed therein to guide a cooling fluid;
• and
• a heat generating layer which receives power and generates heat disposed directly on outer surfaces of each of the pipes, wherein the heat generating layer is formed only at a region of the outer surfaces of pipes which is located closest to the cavity.

An injection mold, comprising:

• a cavity defined by a first mold part and a second mold part;
• an injection device for injecting resin into the cavity;
• cooling channels disposed in at least one of the first mold part and the second mold part;
• a heat generating layer disposed within the cooling channels, wherein the heat generating layer is formed only at a region within each of the cooling channels which is located closest to the cavity;
• a temperature sensing unit to sense the temperature of the cavity;
• a cooling pump to supply cooling fluid to the cooling channels;
• and
• a control unit that powers the heat generating layer to heat the injection mold, cuts off power to the heat generating layer if the temperature sensing unit senses that a predetermined temperature has been reached for the injection mold, controls the injection device to inject molten resin into the cavity, and controls the cooling pump to supply the cooling fluid to the cooling channels.