Patent ID: 8246340

Claim:
A light guide plate injection molding die comprising: a first molding unit comprising a first molding surface and a peripheral sidewall surrounding the first molding surface, at least one gap defined in an edge between the first molding surface and the peripheral sidewall, and at least one gas hole exposed at the at least one gap for providing pressurized gas to the at least one gap; at least one slide block opposite to the peripheral sidewall, the slide block capable of moving toward or away from the peripheral sidewall, the slide block comprising a protrusion for engaging in the gap to cover the gas hole, the protrusion comprising a protrusion surface coplanar with the first molding surface; a plurality of elastic elements disposed between the at least one slide block and the peripheral sidewall; a second molding unit comprising a second mold surface, wherein when the first molding unit is incorporated with the second molding unit, the second molding unit presses the at least one side block to move toward the peripheral sidewall, the protrusion engages in the gap to cover the gas hole, all of the second mold surface, the first molding surface, the protrusion surface, and the at least one slide block cooperatively define a mold cavity.