Electrical connector having an elastic engagement arm and an elastic ejection arm

An engagement structure of an electrical connector for engaging with a circuit board, one side of the circuit board being formed with a first notch, and an inner side of the first notch being formed with a second notch, the engagement structure of the electrical connector comprising:

• an elastic engagement arm, which can be elastically and laterally moved and has one connection end and one free end, a resting portion protruding laterally and an engagement portion for engaging with the first notch of the circuit board being formed near the free end;
• and
• an elastic ejection arm, which can be elastically and laterally moved and has a connection end and a free end, a touching portion and an inverse hook being formed near the free end of the elastic ejection arm, wherein:
• the inverse hook is formed with a guiding bevel and a hooking surface;
• when the elastic ejection arm is pushed laterally, the touching portion touches the resting portion of the elastic engagement arm to make the elastic engagement arm expand outwards, such that the engagement portion gradually escapes from the second notch of the circuit board, the guiding bevel of the inverse hook of the elastic ejection arm gradually presses the circuit board through the first notch, and the elastic ejection arm deforms elastically;
• and
• when the inverse hook of the elastic ejection arm completely passes through the first notch and makes the engagement portion of the elastic engagement arm escape from the second notch, the elastic ejection arm rebounds such that the hooking surface of the inverse hook hooks the circuit board.