Abstract
Magnetic recording medias, e. g. tapes and disks for video and audio, has been making a remarkable advance for these 30 years.
Now, magnetic recording medias are daily commodities, becouse of remarkable improvement of property and cost reduction. Required performance for magnetic tapes are electromagnetic properties and physical properties.
Magnetic recording media gets 1 dB higher output every year. This pace of development has continued over 20 years. This depends on both magnetic materials and process technology of tape.
Dowa Mining Co., Ltd. has started research and development of metal particle from 1978. We filed an application for a patent of metal particle in 1980. 15t/month plant was established in 1983.
Our metal particle was applied for 8mm video tape in 1984. And now, we have a overwhelming share of world market, with 125t/month plant.
We give thanks to our customers who found merits of our metal particle, pointed out its faults, and launched for various metal tapes.
