Production of magnetic disk

Abstract

Abstract PURPOSE:To obtain an optical disk having adhesive power which is substantially high even under high environmental temp. conditions by sticking two sheets or optical disk substrates with a spacer in-between by an ultrasonic welding method thereby manufacturing the optical disk. CONSTITUTION:Two sheets of the optical disk substrates 1, 1 are stuck with the recording film faced on the inner side and the spacer 2 held in-between by the ultrasonic welding method to manufacture the optical disk having air sandwich structure. A hot-melt adhesive sheet prepd. by dispersing and incorporating the pulverized particle of a thermoplastic resin into a hot-melt adhesive agent having >=80 deg.C melting temp. is used as the spacer 2. The pulverized particle having 50mu-1mm grain size is used as the pulverized particle of the thermoplastic resin in this stage and the content of the pulverized particle is made 10-90wt%.

Inventors

• 👤 Yasushi Omori
• 👤 康司 大森
• 👤 Tadaaki Moriyama
• 👤 森山　忠明
• 👤 Eisaku Takeuchi
• 👤 栄作 竹内
• 👤 Shiyuuzou Iyoshi
• 👤 就三 伊吉

Bibliographic Details