公开(公告)号：EP1310952A3

公开(公告)日：2004-11-24

申请号：EP02025184.9

申请日：2002-11-11

申请人： Minebea Co., Ltd. ,  Optware Co., Ltd.

发明人： Matsumoto, Kozo, c/o Minebea Co., Ltd. ,  Kato, Hideki, c/o Minebea Co., Ltd. ,  Horimai, Hideyoshi, c/o Optware Co., Ltd. ,  Kinoshita, Masaharu, c/o Optware Co., Ltd. ,  Lim, Pang-Boey, c/o Optware Co., Ltd.

IPC分类号： G11B7/09 ,  G11B7/0065 ,  G11B7/135

CPC分类号： G11B7/0938 ,  G11B7/0065 ,  G11B7/00745 ,  G11B7/0901 ,  G11B7/0908

摘要： An optical information recording device for recording information utilizing holography comprises a recording medium moving means for moving a recording medium, a follow-up control circuit (94) for controlling an irradiation position, and a signal converting means (51) for obtaining a reproduction signal from an address servo-control area including a light source for radiating an information beam and a reference beam onto the recording medium. The follow-up control circuit is composed of a binary-coding means (52) for binary-coding the reproduction signal and a follow-up signal circuit (50), and detects the travel amount of the irradiation position moving means and generates, according to the travel amount detected and for a specific time during which the irradiation position of the information beam and the reference beam follows, an irradiation position control signal for controlling an irradiation position moving in one information recording area through an output terminal of a gain control amplifier (47).

公开(公告)号：EP1091370A3

公开(公告)日：2004-01-28

申请号：EP00113874.2

申请日：2000-06-30

申请人： Minebea Co., Ltd.

发明人： Inoue, Mitsuteru ,  Fujii, Toshitaka, ,  Takayama, Akio, c/o Minebea Co., Ltd. ,  Kitamura, Atsushi, c/o Minebea Co., Ltd. ,  Adachi, Shigeyuki, c/o Minebea Co., Ltd. ,  Kato, Hideki, c/o Minebea Co., Ltd.

IPC分类号： H01F41/18 ,  H01F10/24 ,  G11B11/105 ,  H01F41/22 ,  H01F10/28

CPC分类号： H01F10/245 ,  G02F1/0036 ,  G11B11/10582 ,  G11B11/10584 ,  G11B11/10586 ,  H01F10/28 ,  H01F41/186 ,  H01F41/22

摘要： This invention provides a magnetic optical member that can obtain a large magneto-optical effect using a rare-earth- iron-garnet-based material and a method of producing the same. According to the present invention, a BiYIG thin film (207) is formed on a (SiO 2 /Ta 2 O 5 ) n layer (210), and heat-treatment for crystallization of the BiYIG thin film (207) is carried out with infrared rays while cooling a non-heat-resisting substrate (203) and the (SiO 2 /Ta 2 0 5 ) n layer (210) through a substrate holder (201). Since the non-heat-resisting substrate (203) is cooled and the deformation thereof is prevented, heat treatment to crystallize the BiYIG thin film (207) can be carried out. By the crystallization of the BiYIG thin film (207) a large magneto-optical effect can be obtained. The non-heat-resisting substrate (203) is cooled, and can be made of a thermoplastic resin or can be formed in a tape shape, film shape or sheet shape. Thus, easy handling of the substrate and downsizing can be realized. Further, it is not necessary to make the substrate of glass, making it easy to form a groove. By the cooling of the (SiO 2 /Ta 2 O 5 ) n layer (210) the interdiffusion of Ta 2 O 5 and SiO 2 is prevented and heat treatment for crystallization can be performed.