Vibration motor

摘要

An unbalance weight of a vibration motor includes a rest section for receiving a rotary shaft and a caulking section for caulking the unbalance weight to the rotary shaft. The rotary shaft includes a recess at a place corresponding to the rest section. Caulking strength applied to the caulking section forces parts of the weight to bite inside of the recess, thereby fixing the weight to the rotary shaft. This structure allows the rotary shaft to hold the weight tightly. The vibration motor can be mounted to a radio paging-device or a cellular phone, so that the user can sense the vibrations to be informed of a calling or a message arrival. The vibration motor is thus suited for a source of vibrations.