Patent ID: 8796559

Claim:
A lead pin for a printed circuit board, comprising: a connection pin; and a pin head part formed at one end portion of the connection pin and including a protrusion, the diameter thereof being formed to be increasingly small based on a surface contacting the connection pin and the outer peripheral surface thereof being provided with a plurality of depression-shaped bands, wherein: the plurality of the bands has a stairstep pattern, the pin head part further includes a head having a plate shape that is formed at one end portion of the connection pin and is disposed between the connection pin and the protrusion, the protrusion is disposed on a surface contacting the head and the outer peripheral surface thereof is provided with a plurality of grooves having a band shape, the protrusion is provided with a semi-sphere formed on a surface contacting the head and a plurality of grooves having a circular band shape formed at the outer peripheral surface of the semi-sphere in a vertical direction to the connection pin, and the diameter of the circular band is small stepwise based on a surface contacting the connection pin.