Toru Yoshihara
Mitsubishi
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Publication
Featured researches published by Toru Yoshihara.
Japanese Journal of Applied Physics | 2005
Hironori Nakahara; Daisuke Matsubara; Toshiya Matozaki; Nobuo Takeshita; Toru Yoshihara
In high numerical aperture optical disc systems, a spherical aberration compensator is required to accomodate thickness deviations of the cover layer and the space layer. In some cases, a liquid crystal (LC) plate is employed as a spherical aberration compensator and it is generally attached to the objective lens actuator coaxial with the objective lens. It is useful to put the LC plate in a fixed part of the optical head to cope with high-speed disc rotation and to reduce the size of the objective lens actuator, but additional objective lens decentering against the LC plate is caused by the tracking operation. In this paper, a new spherical aberration compensator for Blu-ray Disc optical systems is introduced to decrease the wavefront aberration caused by objective lens decentering.
Japanese Journal of Applied Physics | 2006
Kenya Nakai; Hironori Nakahara; Daisuke Matsubara; Toshiya Matozaki; Nobuo Takeshita; Toru Yoshihara; Kazuo Mori
We discuss focusing error detection achieving smooth and accurate layer-accessing operations in a multilayer optical disc system. In layer-accessing operations, focusing error signals both unchanged on all layers and detected on specific layers are ideally required. We have studied two types of focusing error detection that generate focusing error signals with different characteristics in regard to spherical aberrations. These focusing error signals are obtained simultaneously by detecting the individual light beams returned by an optical disc, which are separated concentrically using the phase distribution features of their spherical aberrations. We confirmed the effects of increasing and decreasing focusing error signal amplitude against spherical aberration in simulations and the effect of increasing it in experiments. The selective use of focusing error signals according to the layer-accessing operation enables us to achieve high accessibility and high assurance in layer-accessing operations in a multilayer optical disc system.
Archive | 1994
Masahisa Shinoda; Kenjiro Kime; Toshiya Matozaki; Keiji Nakamura; Toru Yoshihara; Takeshi Ito
Archive | 1989
Manabu Koike; Shinsuke Shikama; Eiichi Toide; Toru Yoshihara; Takashi Saito
Archive | 2006
Tomokazu Fukuda; Manabu Hashimoto; Kaoru Kawada; Takayuki Kushida; Akihiro Nagase; Kyoichiro Oda; Tomonori Ohashi; Kosuke Yagi; Toru Yoshihara; 孝介 八木; 徹 吉原; 知典 大橋; 恭一郎 小田; 橋本 学; 隆行 櫛田; 薫 河田; 智教 福田; 章裕 長瀬
Archive | 1991
Eiichi Toide; Toru Yoshihara
Archive | 2000
Mitsuru Irie; Toshiya Matosaki; Nobuo Takeshita; Toru Yoshihara; 満 入江; 徹 吉原; 俊哉 的崎; 伸夫 竹下
Archive | 1991
Takeshi Ito; Toshiya Matosaki; Keiji Nakamura; Toru Yoshihara; 恵司 中村; 武之 伊藤; 徹 吉原; 俊哉 的崎
The Review of Laser Engineering | 2011
Akihiro Nagase; Muneharu Kuwata; Satoru Okagaki; Atsushi Michimori; Jun Someya; Hiroaki Sugiura; Yoshihito Hirano; Akira Nakamura; Eiichi Toide; Toru Yoshihara; Shigenori Teramatsu
International Symposium on Optical Memory and Optical Data Storage (2005), paper TuP16 | 2005
Kenya Nakai; Hironori Nakahara; Daisuke Matsubara; Toshiya Matozaki; Nobuo Takeshita; Toru Yoshihara; Kazuo Mori