公开(公告)号：US20030048704A1

公开(公告)日：2003-03-13

申请号：US10237686

申请日：2002-09-10

Applicant: Minebea Co., Ltd.

Inventor： Atsushi Kitamura ,  Kozo Matsumoto ,  Mizuki Nakamura ,  Motoji Egawa

IPC: G11B007/095 ,  G11B007/135

CPC classification number: B82Y10/00 ,  G11B7/0903 ,  G11B7/1365 ,  G11B7/1381 ,  G11B2007/0006

Abstract: An optical information reading apparatus includes a semiconductor laser, a beam splitter, a collimating lens, a super-resolution cut-off filter, an objective lens having a high numerical aperture, and a photodetector. The super-resolution cut-off filter is disposed immediately in front of the incident side of the objective lens. The photodetector is a well-known eight-division photodetector with a signal processing circuit, reads recorded information and also outputs tracking and focusing control signals to a control circuit. The laser beam is separated into a 0-th order laser beam and nullprimary laser beams, which are made incident on the objective lens, pass therethrough, and are made incident on the recording surface of a disk. The 0-th order laser beam is used to read information and to control focussing while the nullprimary laser beams are used to control tracking.

Abstract translation: 光学信息读取装置包括半导体激光器，分束器，准直透镜，超分辨率截止滤光器，具有高数值孔径的物镜和光电检测器。 超分辨率截止滤光器立即设置在物镜的入射侧的前方。 光电检测器是具有信号处理电路的众所周知的八分光电检测器，读取记录的信息，并且还将跟踪和聚焦控制信号输出到控制电路。 将激光束分离为0级激光束，入射到物镜上的±主激光束通过，并入射到盘的记录面上。 当使用±主激光束来控制跟踪时，第0阶激光束用于读取信息并控制聚焦。

公开(公告)号：US20020025450A1

公开(公告)日：2002-02-28

申请号：US09974850

申请日：2001-10-12

Applicant: MINEBEA CO., LTD.

Inventor： Mitsuteru Inoue ,  Toshitaka Fujii ,  Akio Takayama ,  Atsushi Kitamura ,  Shigeyuki Adachi ,  Hideki Kato

IPC: G11B005/105

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

Abstract: 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 (SiO2/Ta2O5)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 (SiO2/Ta2O5)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 (SiO2/Ta2O5)n layer (210) the interdiffusion of Ta2O5 and SiO2 is prevented and heat treatment for crystallization can be performed.

Abstract translation: 本发明提供一种使用稀土 - 铁 - 石榴石材料获得大的磁光效应的磁性光学元件及其制造方法。 根据本发明，在（SiO 2 / Ta 2 O 5）n层（210）上形成BiYIG薄膜（207），并且在冷却时用红外线进行BiYIG薄膜（207）的结晶热处理 通过衬底保持器（201）的非耐热衬底（203）和（SiO 2 / Ta 2 O 5）n层（210）。 由于非耐热基板（203）被冷却并且其变形被阻止，所以可以进行热处理以使BiYIG薄膜（207）结晶。 通过BiYIG薄膜（207）的结晶，可以获得大的磁光效应。 非耐热衬底（203）被冷却，并且可以由热塑性树脂制成，或者可以形成为带状，膜形或片状。 因此，可以实现基板的容易处理和小型化。 此外，不需要制造玻璃基板，从而容易形成凹槽。 通过（SiO 2 / Ta 2 O 5）n层（210）的冷却，可以防止Ta2O5和SiO2的相互扩散，并且可以进行结晶热处理。