Patent ID: 9676130
Date: 2017-06-13
CPC Classifications: B29C,B29D,B29L

Claim:
1. An injection molding apparatus for making an optical part having a structured deflection or reflection optical surface, the injection molding apparatus including: a mold plate, the mold plate including an opening; a mold insert having a reversed structured surface to create the deflection or reflection optical surface of the optical part, the mold insert including at least two mold insert segments, each mold insert segment having a portion of the reversed structured surface and having lateral planar surfaces; a gas venting circuit provided on the lateral planar surfaces of the mold insert segments, the gas venting circuit including a main gas venting conduit and a plurality of secondary gas venting conduits, the plurality of secondary gas venting conduits being in fluid communication with the main gas venting conduit and each of the plurality of secondary gas venting conduits being in fluid communication with the reversed structured surface through corresponding gas venting slits, each gas venting conduit and each gas venting slit having one half on one of the lateral planar surfaces and another haft on the other of the lateral planar surfaces when the mold insert segments are juxtaposed to form the mold insert; and a cooling circuit embedded into the mold insert segments for receiving a liquid coolant, the cooling circuit including cooling conduits located under the reversed structured surface of the mold insert segments to lower the temperature of the mold insert segments and thereby increasing the viscosity of a molten material being injected over the mold insert segments.