Tokusen Kogyo Co., Ltd.

Tomoki Kitafuji

Insoo Kim

Yoshinobu Kageyama

Chang-Gun Lee

Yoshio Kimori

A fine silver particle-containing composition includes a large number of fine silver particlesand a coating layerthat covers a surface of each silver particle. The silver particleis a so-called nano particle. The silver particlehas a scale-like shape. The coating layerconsists of an organic compound. The organic compound binds to the silver particle. The organic compound suppresses aggregation of the silver particle. The composition is in a cake form. A weight ratio of the organic compound with regard to the total amount of the composition is not lower than 2% but not higher than 15%.

Fine metal particle-containing composition

A probe needle for a probe card which is characterized by applying a Ni plating containing PTFE to at least an end face of a tip portion thereof is disclosed. A Ni plating containing PTFE layer may preferably be formed on the tip portion of the probe needle by using a Ni plating layer as a substrate. The Ni plating may preferably have a thickness of 0.5-2 &mgr;m to ensure the adhesion of the Ni plating containing PTFE, while the Ni plating containing PTFE may preferably have a thickness of 0.5-2 &mgr;m to ensure the sliding property of the PTFE. In this probe needle, since the tip portion thereof is covered with the Ni plating containing PTFE layer, the wear resistance is not deteriorated, the favorable conductivity is obtained, and the oxidization of the end face which is brought into contact with an integrated circuit is prevented. Further, with the use of PTFE, the sliding property is enhanced so that the adhesion of the aluminum oxide can be substantially completely prevented thus ensuring the stable conductivity.

Growing community of inventors

Ono, Japan

Tomoki Kitafuji