Abstract: A positioning module and a mold insert thereof are provided. The positioning module for positioning an insert includes a lower mold disposed relatively below, an upper mold disposed relatively above and at least one mold insert. The mold insert includes an insert body, a positioning hole, at least one roller guide slot and at least one roller set. The positioning hole is formed in the insert body for the insert to pass through to be positioned. The roller guide slot is disposed at the insert body and partially communicates with the positioning hole. The roller set is disposed in the corresponding roller guide slot, and rolls in circular motion. When at a position where the corresponding roller guide slot communicates with the positioning hole, the roller set protrudes to the positioning hole to be in rolling contact with at least one side of the insert.

Abstract: A bulb structure and a light guide lamp cover thereof are provided. The bulb structure comprises a light source and a lamp body. The light source includes a circuit board and a plurality of light emitting elements disposed on the circuit board. The lamp body includes a light guide lamp cover disposed above the light source. The light guide lamp cover includes a light guide element and a holder. The light guide element covers a peripheral surface of the holder. The light guide element is moveably connected onto the holder through a fastening element and can move relative to the holder.