Tatsumi Ito

Masataka Shinoda; Kimihiro Saito; Tsutomu Ishimoto; Tatsumi Ito; Ariyoshi Nakaoki; Masanobu Yamamoto; Osamu Maeda; Toshihiro Hashizu; Takeharu Asano; Keigo Aga; Katsuji Takagi; Minoru Tazoe

Key technologies for near-field recording/readout systems using a solid immersion lens (SIL) are summarized in this paper. Our system employing a SIL of 1.84 numerical aperture (NA) and a laser diode (LD) of 405 nm wavelength has realized the capacity of a 112 GB in a 12 cm diameter phase-change disc along with a write-power margin of ±11.2% and a data transfer rate of 36 Mbps. Such a larger-capacity data storage system should provide a high data transfer rate. A preliminary result of 1.84 NA dual-channel near-field recording/readout using a monolithic dual-beam LD with 412 nm wavelength is presented.

Tsutomu Ishimoto; Tatsumi Ito; Masataka Shinoda; Kimihiro Saito; Takao Kondo; Takeshi Matsui; Sunmin Kim; Ariyoshi Nakaoki; Masanobu Yamamoto

Several near field optical disk systems have been proposed and are expected to be the tools for realizing large-capacity optical disk storage systems. However, there remains a concern as to whether removability can be realized in near-field optical disk systems. To resolve this concern, we analyze a near-field optical head installed onto a 2-axis actuator in an air flow. Finally, we conclude that a conical head and the active servo of a 2-axis actuator contribute to the stability of near-field playability with respect to dust robustness.

Sohichi Kuwahara; Shigeyoshi Hirashima; Tatsumi Ito

Tatsumi Ito; Masaya Kakuta; Shingo Imanishi; Nao Nitta; Koji Futamura; Toru Takashimizu; Koji Ashizaki; Motohiro Furuki

Tatsumi Ito; Soichi Kuwahara

Koji Ashizaki; Motohiro Furuki; Koji Futamura; Shingo Imanishi; Tatsumi Ito; Takashi Nitta; Toru Takashimizu; Masaya Tsunoda; 孝治 二村; 慎悟 今西; 達巳 伊藤; 基裕 古木; 尚 新田; 浩二 芦崎; 正也 角田; 亨 高清水

Yuichiro Ikemoto; Tatsumi Ito; Takeshi Matsui; Koji Ashizaki

Minoru Takeda; Motohiro Furuki; Tatsumi Ito

Tatsumi Ito; Shoji Akiyama; Masaya Kakuta; Takeshi Yamasaki

Makoto Ando; Tatsumi Ito; Koji Ashizaki; Takahiro Toyoda; Minoru Takeda; Seiji Kobayashi