Tosoh Corporation

Tosoh Quartz Corporation

Tosoh Smg Corporation

Shuzo Mizutani

Akira Kawai

Yoshinori Harada

Shinkichi Hashimoto

Masakazu Kudoh

Kazuyuki Fujio

Katsuaki Ishimaru

Naoki Miura

Katsufumi Takahashi

Hideki Kiyohara

Highly durable silica glass containing 0.01% to 2% by weight of at least one element selected from magnesium, calcium, strontium, barium, yttrium, hafnium and zirconium. The silica glass is produced by melting a powdery material comprising a finely divided silica powder and a finely divided zirconium-containing substance by oxyhydrogen flame or plasma are to form an accumulated molten material layer, and extending the molten material layer outwardly in radial directions.

Highly durable silica glass, process and apparatus for producing same, and member and apparatus provided with same

A magneto-optical disk device, in which data are written and read in and from a magneto-optical disk housed in a magneto-optical disk cartridge having a head window of a predetermined shape, comprises: first and second magneto-optical heads disposed so as to locate in the head window for accessing the magneto-optical disk; a center rail disposed substantially at the center of the window head along a diameter of the magneto-optical disk; a first side rail and a second side rail which are disposed parallelly with each other on both sides of the center rail; a first carriage slidably disposed between the center rail and the first side rail, and having at least a part of the first magneto-optical head mounted thereon; first driving means for driving the first carriage along the center rail; a second carriage slidably disposed between the center rail and the second side rail, and having at least a part of the second magneto-optical head mounted thereon; and second driving means for driving the second carriage along the center rail.

Magneto-optical disk device having a plurality of independently moving

Growing community of inventors

Fujisawa, Japan

Shuzo Mizutani