Tomotada Kamei | Researchain

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Featured researches published by Tomotada Kamei.

Japanese Journal of Applied Physics | 2001

Inner Area Aberration Compensating Lens for Compact Disc (Compact Disc-Recordable)-Digital Versatile Disc Compatible Head

Hideki Hayashi; Hiroaki Yamamoto; Joji Anzai; Tomotada Kamei; Sadao Mizuno; Yasuhiro Tanaka; Michihiro Yamagata

We have developed a dual-wavelength digital versatile disc(DVD)/compact disc(CD)-compatible inner area aberration compensating lens capable of reading compact disc-recordable (CD-R) disks. In order to be able to read CD and CD-R disks with an infrared laser, it is essential to increase the numerical aperture (NA) of the inner area, but the resulting deterioration of the read signal has been a problem. Performance levels that enable DVD disks to be read have been achieved by reducing the fifth-order spherical aberration (SA5) by means of a phase step.

Archive | 2007

Optical pick-up head, optical information apparatus, and optical information reproducing method

Shinichi Kadowaki; Kousei Sano; Akihiro Arai; Katsuhiko Yasuda; Tomotada Kamei; Hiroaki Yamamoto; Fumitomo Yamasaki

Archive | 1996

Mounting structure of objective lens for optical pick-up used for optical disk device

Yutaka Murakami; Takao Hayashi; Tomotada Kamei

Archive | 2004

Optical pickup head device, optical information device, and optical information reproducing method

Akihiro Arai; Shinichi Kadowaki; Tomotada Kamei; Akimasa Sano; Hiroaki Yamamoto; Fumitomo Yamasaki; Katsuhiko Yasuda; 智忠亀井; 晃正佐野; 勝彦安田; 文朝山崎; 博昭山本; 昭浩荒井; 慎一門脇

Archive | 2005