Crown assembly and wearable device

A wearable device, comprising:

• a case and a crown assembly, wherein
• the crown assembly is configured to implement a crown function;
• the crown assembly comprises a button tube, a crown, a spring piece, a switch, and a fastening frame;
• the button tube and the fastening frame are configured to be disposed in the case;
• the crown comprises a crown cap and a crown stem that are connected, wherein the crown stem has a contact end away from the crown cap, the crown stem passes through an inner cavity of the button tube, the crown stem is rotatably connected to a cavity wall of the inner cavity and is operable to move in the inner cavity along an axis of the crown stem, and the contact end and the crown cap are exposed at two opposite ends of the button tube;
• the spring piece comprises a first plate, an elastic arm, and a second plate, wherein two ends of the elastic arm are respectively connected to the first plate and the second plate, the second plate is configured to dispose the spring piece on the fastening frame, one end of the elastic arm that is connected to the second plate and the other end of the elastic arm that is connected to the first plate are respectively located on two sides of an end surface of the contact end, one side of the first plate is close to the switch, and the other side of the first plate is in contact with the end surface of the contact end;
• the switch is disposed on the fastening frame and is located on a side of the first plate that faces away from the contact end;
• and
• the crown assembly is operable such that when pressure is exerted on the crown cap, the crown stem is operable to move along the axis and push the first plate away from the end of the elastic arm that is connected to the second plate, to enable the first plate to press the switch, wherein the elastic arm is operable to generate elastic deformation, and when the pressure on the crown cap is released, the first plate is operable to push the crown stem away from the switch under elasticity of the elastic arm;
• and
• the case has an installation hole to communicate with an inner side and an outer side of the case;
• and
• the button tube is fastened to an inner wall of the installation hole, both a part of the button tube and the crown cap are located outside the case, and both the spring piece and the switch are located in the case.