Katsuhiko Yasuda | Researchain

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Japanese Journal of Applied Physics | 2002

Digital versatile disc read-only disc, rewritable disc and compact disc compatible optical pickup with a two-wavelength laser diode unit

Eishinn Mori; Yoshiaki Komma; Katsuhiko Yasuda; Naoya Hotta; Osamu Imafuji; Atsuo Kikuchi; Tatsuo Itoh

We have developed an optical pickup with a two-wavelength laser diode unit which can read all the compact disc (CD) and digital versatile disc (DVD) family, including DVD rewritable discs (DVD-RAMs). To enable DVD-RAMs to be read, it is necessary to increase the light power efficiency of the optical system and to reduce the so-called track-crossing noise. This paper discusses several approaches to designing an optical system using a monolithic two-wavelength laser diode, and describes our experimental results and compatible reading of DVD read-only discs (DVD-ROMs), DVD-RAMs, and CDs using an optical pickup with a two-wavelength laser diode unit.

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 | 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 | 2001