Sumitomo Electric Industries, Limited

Misako Osoegawa

Masatoshi Majima

Noriyuki Yoshida

Takafumi Uemiya

Hideki Kashihara

Masamichi Yamamoto

Yutaka Fukuda

Jun Yorita

Keiji Koyama

Hideaki Toshioka

Yoshie Tani

Sekiya Yamazaki

An anisotropic conductive film, and its production method, especially suitable for mounting a semiconductor package and sufficiently satisfying the requirements of higher density mounting because short circuit does not occur in the plane direction of the film even if the pitch of electrodes is small, or suitable for mounting a contact probe because conductive connection not fused with a high current can be ensured with a lower pressure and even a high frequency signal can be dealt with. The anisotropic conductive film contains metal powder having such a shape that many fine metal particles are linked as a conductive component, wherein the length of the chain of metal powder is set not longer than the distance between adjacent electrodes being bonded conductively when a semiconductor package is mounted, and the diameter of the chain is set in the range of 1 &#x3bc;m-20 &#x3bc;m when a contact probe is mounted. At least a part of the film is formed while orienting a chain formed of a paramagnetic metal with a magnetic field.

Anisotropic conductive film and method for producing the same

A membrane switch comprising a pair of electrode plates and a spacer separating the plates, wherein the operating force required to operate the membrane switch by pressing it with a rod having a hemispherical tip with a radius of curvature of 5 mm is within the range of 0.03 to 0.2 kg. The spacer is in the form of a film, the film has through holes, and the aperture ratio of the through holes is 50% or above. The effect is that a membrane switch exhibiting no malfunction, negligible variation in the operating force, and excellent in durability can be obtained.

Membrane switch and production method thereof

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Osaka, Japan

Misako Osoegawa