Axial reciprocating motion structure of lamp

The axial reciprocating motion structure of the lamp comprises a reflecting cover, and further comprises a base and a first driving piece, the base is located on the rear side of the reflecting cover, the first driving piece is located between the base and the reflecting cover, an elastic tensioning structure is further connected between the base and the reflecting cover, and the first driving piece is connected with the reflecting cover. The first driving piece is used for driving the reflecting cover to move forwards in the axial direction, the elastic tensioning structure is used for driving the reflecting cover to move backwards in the axial direction when the first driving piece moves backwards, and the light-emitting unit and the reflecting cover can be matched in a sleeved mode. 本实用新型提出一种灯具的轴向往复运动结构，包括反光罩，还包括基座、第一驱动件，基座位于反光罩后侧，第一驱动件位于基座与反光罩之间，基座与反光罩之间还连接有弹性拉紧结构，第一驱动件与反光罩连接，第一驱动件用于带动反光罩轴向向前运动，弹性拉紧结构用于在第一驱动件往后运动时带动反光罩轴向往回运动，有利于实现发光单元与反光罩套接配合。