Optical lens mold with built in cooling channel

An optical lens mold, comprising:

• a power source;
• a mold body defining a plurality of injection chambers therein and a cooling channel to cool the plurality of injection chambers;
• a magnetic fluid containing magnetic particles therein and flowing in the cooling channel;
• a plurality of thermocouples mounted adjacent to the plurality of injection chambers correspondingly;
• a plurality of electromagnets mounted above the cooling channel and adjacent to the plurality of thermocouples correspondingly, the plurality of electromagnets being connected to the power source;
• and
• a controlling unit having a predetermined temperature value;
• wherein the controlling unit is electronically connected to the plurality of thermocouples and the power source, the controlling unit is capable of comparing the predetermined temperature value with temperature values sensed by the plurality of thermocouples, and controlling the power source to supply current to corresponding electromagnets to generate heat or supply lower current to gather the magnetic particles in the magnetic fluid to dissipate heat.