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132 条记录 (耗时 0.023 秒)

    Optical disk reproducing apparatus
    83.
    发明授权
    Optical disk reproducing apparatus 有权
    光盘重放装置

    公开(公告)号：US06324618B1

    公开(公告)日：2001-11-27

    申请号：US09563433

    申请日：2000-05-03

    申请人： Hiroshi Hirayama ,  Osamu Kawamae ,  Masayuki Hirabayashi ,  Yutaka Nagai ,  Toshifumi Takeuchi

    发明人： Hiroshi Hirayama ,  Osamu Kawamae ,  Masayuki Hirabayashi ,  Yutaka Nagai ,  Toshifumi Takeuchi

    IPC分类号： B11B724

    CPC分类号： G11B20/1217 ,  G11B7/0037 ,  G11B7/0045 ,  G11B7/005 ,  G11B7/00745 ,  G11B19/12 ,  G11B20/1252 ,  G11B27/034 ,  G11B27/105 ,  G11B27/3027 ,  G11B27/329 ,  G11B2007/0013 ,  G11B2020/1229 ,  G11B2020/1232 ,  G11B2020/1267 ,  G11B2020/1295 ,  G11B2220/213 ,  G11B2220/237 ,  G11B2220/2545

    摘要： An optical disk reproducing apparatus for reproducing digital signals in the form of a data frame including a lead-in block and data blocks from an optical disk including at least first and second recording surfaces each being readable from a same side of the optical disk. The data blocks include block addresses and data, and are recorded on the first and second recording surfaces. The lead-in block is recorded at a head of the data frame and includes disk information relating to a number of data blocks recorded on the first and second recording surfaces. The apparatus includes an optical pickup, a focus control circuit, a pickup movement control circuit, a disk information detection circuit which detects disk information included in a reproduced lead-in block, a block address detection circuit which detects block addresses included in reproduced data blocks, and an access/reproduction control circuit which controls the focus control circuit and the pickup movement control circuit to access the first and second recording surfaces and reproduce data blocks recorded thereon. The access/reproduction control circuit controls the focus control circuit to perform focus changing of the optical pickup to access the first and second recording surfaces in accordance with block addresses of data blocks to be reproduced and the detected disk information.

    摘要翻译： 一种用于再现数字信号的光盘再现装置，该数据信号包括从光盘至少包括第一和第二记录表面的数据块和数据块，每个记录表面可从光盘的同一侧读取。 数据块包括块地址和数据，并被记录在第一和第二记录表面上。 导入块被记录在数据帧的头部，并且包括与记录在第一和第二记录表面上的多个数据块有关的盘信息。 该装置包括光拾取器，聚焦控制电路，拾取移动控制电路，检测包含在再现的导入块中的盘信息的盘信息检测电路，块地址检测电路，其检测再现数据块中包括的块地址 以及访问/再现控制电路，其控制聚焦控制电路和拾取器移动控制电路以访问第一和第二记录表面并再现其上记录的数据块。 访问/再现控制电路控制聚焦控制电路，以根据要再现的数据块的块地址和检测到的盘信息来执行光学拾取器的聚焦改变以访问第一和第二记录表面。

    Semiconductor laser
    89.
    发明授权
    Semiconductor laser 失效
    半导体激光器

    公开(公告)号：US5920586A

    公开(公告)日：1999-07-06

    申请号：US970619

    申请日：1997-11-14

    申请人： Yutaka Nagai

    发明人： Yutaka Nagai

    IPC分类号： H01S5/00 ,  H01S5/22 ,  H01S5/32 ,  H01S3/19

    CPC分类号： H01S5/22 ,  H01S5/3211 ,  H01S5/3213

    摘要： A semiconductor laser includes a first conductivity type semiconductor substrate; a first conductivity type lower cladding layer, an active layer, and a second conductivity type first upper cladding layer, disposed in this order on the first conductivity type semiconductor substrate; a second conductivity type current confinement layer disposed on the first upper cladding layer, made of a semiconductor material containing a higher composition ratio of Al than the first upper cladding layer and having a stripe shape with a width and extending in a direction; and a second conductivity type second upper cladding layer made of the same material as the first upper cladding layer, disposed on the current confinement layer so that a central longitudinal axis of the current confinement layer is located directly opposite a central longitudinal axis of the current confinement region, and having a ridge structure with a bottom surface facing the first upper cladding layer, in contact with, and having a width larger than the current confinement layer, the grooves limiting the area in which current can flow between the lower cladding layer and the first upper cladding layer, eliminating leakage current that is not effective in generating light.

    摘要翻译： 半导体激光器包括第一导电型半导体衬底; 第一导电型下包层，有源层和第二导电型第一上包层，依次设置在第一导电类型半导体衬底上; 第二导电型电流限制层，其设置在所述第一上包层上，由包含比所述第一上包层更高的Al的组成比并且具有宽度方向延伸的条状的半导体材料制成; 以及第二导电类型的第二上包层，其由与第一上包层相同的材料制成，设置在电流限制层上，使得电流限制层的中心纵轴线与电流限制的中心纵轴线正好相对 并且具有与所述第一上包层相对的底表面的脊结构，与所述电流限制层接触并且具有大于所述电流限制层的宽度，所述沟槽限制电流可以在所述下包层和所述第一上包层之间流动的区域 第一上敷层，消除在发光时无效的泄漏电流。

    Semiconductor laser
    90.
    发明授权
    Semiconductor laser 失效
    半导体激光器

    公开(公告)号：US5892785A

    公开(公告)日：1999-04-06

    申请号：US967105

    申请日：1997-11-10

    申请人： Yutaka Nagai

    发明人： Yutaka Nagai

    IPC分类号： H01S5/00 ,  H01S5/028 ,  H01S5/22 ,  H01S3/19

    CPC分类号： H01S5/22 ,  H01S5/221

    摘要： A semiconductor laser includes a lower cladding layer, an active layer, a first upper cladding layer, an etch-stopping layer, a second upper cladding layer, and a contact layer successively laminated on a substrate, a ridge waveguide formed by selectively etching the second upper cladding layer and the contact layer with the use of a stripe-like insulating film as a mask to form a ridge, an AlAs oxide layer on the substrate and a second electrode on the substrate. Incorrect positioning does not occur between the ridge waveguide and a first electrode, reliability is improved, and the distribution of effective refractive index transverse to the resonation of the laser is reduced. A detailed method of fabricating this semiconductor laser is also provided.

    摘要翻译： 半导体激光器包括：下包层，有源层，第一上覆层，蚀刻停止层，第二上包覆层和依次层压在基板上的接触层;通过选择性蚀刻第二 上覆层和接触层，使用条状绝缘膜作为掩模以形成脊，衬底上的AlAs氧化物层和衬底上的第二电极。 棱脊波导与第一电极之间不会发生不正确的定位，可靠性提高，横向于激光谐振的有效折射率分布减小。 还提供了制造该半导体激光器的详细方法。