公开(公告)号：EP1999739A1

公开(公告)日：2008-12-10

申请号：EP07740763.3

申请日：2007-03-26

申请人： Ricoh Company, Ltd.

发明人： MAEGAWA, Hiroshi

IPC分类号： G09G3/20 ,  G09G3/34 ,  G02F1/13 ,  G02F1/167

CPC分类号： G06F21/84 ,  G02F1/13476 ,  G02F1/167 ,  G02F2201/44 ,  G06F2221/2111 ,  G09G3/344 ,  G09G3/3611 ,  G09G2358/00 ,  G09G2380/02

摘要： The object is to provide a display apparatus which keeps information security within a specific area, while ensuring its portability and rewritability. A display apparatus includes a display unit (11) configured to display information without a power supply; an area identifying unit (16) configured to determine whether the display apparatus is inside a permission area (9) where a read of the information displayed on the display unit (11) is permitted; and a data controller (14) configured to delete the information displayed on the display unit (11) or to display other information on the display unit (11), when the area identifying unit (16) determines that the display apparatus has moved from the inside of the permission area (9) to the outside of the permission area (9).

公开(公告)号：EP1657712A1

公开(公告)日：2006-05-17

申请号：EP04771043.9

申请日：2004-07-29

申请人： Ricoh Company, Ltd.

发明人： MAEGAWA, Hiroshi

IPC分类号： G11B7/004 ,  G11B7/24

CPC分类号： G11B7/0941 ,  G11B7/0037 ,  G11B7/094 ,  G11B20/10481 ,  G11B2007/0013

摘要： In an optical information record medium including a plurality of record layers that are recordable, various signal characteristics with respect to an area X in a record layer A (second layer) among the plurality of record layers are defined under a condition that an area Y in a record layer B (first layer) adjacent to the record layer A (second layer) on an incident side thereof along an optical axis of a light beam shone on the area X is a prerecorded area. This suppresses variation and errors in the measurement of characteristics of various signals caused by the interfering light coming from an adjacent record layer, thereby making it possible to manage and define media parameters with characteristic values having high reliability, compatibility, and reproducibility.

摘要翻译： 在包括可记录的多个记录层的光学信息记录介质中，在多个记录层中的记录层A（第二层）中的区域X的各种信号特性被定义为在 在区域X上照射光束的光轴的入射侧与记录层A（第二层）相邻的记录层B（第一层）是预先记录的区域。 这抑制了由来自相邻记录层的干扰光引起的各种信号的特性的测量的变化和误差，从而使得可以通过具有高可靠性，兼容性和再现性的特征值来管理和限定媒体参数。

公开(公告)号：EP1657712B1

公开(公告)日：2017-08-30

申请号：EP04771043.9

申请日：2004-07-29

申请人： Ricoh Company, Ltd.

发明人： MAEGAWA, Hiroshi

IPC分类号： G11B7/0037 ,  G11B20/10 ,  G11B7/09 ,  G11B7/00 ,  G11B7/004 ,  G11B7/24

CPC分类号： G11B7/0941 ,  G11B7/0037 ,  G11B7/094 ,  G11B20/10481 ,  G11B2007/0013

摘要： In an optical information record medium including a plurality of record layers that are recordable, various signal characteristics with respect to an area X in a record layer A (second layer) among the plurality of record layers are defined under a condition that an area Y in a record layer B (first layer) adjacent to the record layer A (second layer) on an incident side thereof along an optical axis of a light beam shone on the area X is a prerecorded area. This suppresses variation and errors in the measurement of characteristics of various signals caused by the interfering light coming from an adjacent record layer, thereby making it possible to manage and define media parameters with characteristic values having high reliability, compatibility, and reproducibility.

摘要翻译： 在包括可记录的多个记录层的光学信息记录介质中，在多个记录层中的记录层A（第二层）中关于区域X的各种信号特性是在区域Y in 沿着照射在区域X上的光束的光轴在其入射侧上与记录层A（第二层）相邻的记录层B（第一层）是预先记录的区域。 这抑制了由来自相邻记录层的干涉光引起的各种信号的特性测量中的变化和误差，由此使得可以管理和定义具有高可靠性，兼容性和再现性的特征值的介质参数。

公开(公告)号：EP1482487A1

公开(公告)日：2004-12-01

申请号：EP03743615.1

申请日：2003-03-05

申请人： Ricoh Company, Ltd.

发明人： MAEGAWA, Hiroshi

IPC分类号： G11B7/005 ,  G11B7/0045 ,  G11B20/10

CPC分类号： G11B20/10 ,  G11B7/0053 ,  G11B7/24082 ,  G11B27/24 ,  G11B2220/216 ,  G11B2220/2562

摘要： A write clock generation circuit is provided that can detect wobble signal in high accuracy and can appropriately generate write clock with only small jitter even when the operation is switched from reproduction to recording. The wobble signal is obtained by changing stepwise the gain of a variable gain amp in the rear stage of a divided photo detector using a gain control circuit in a predetermined time period just after the beginning of recording. The write clock signal is generated using the above wobble signal. According to this arrangements, the change in wobble signal just before and after the beginning of recording can be reduced, and the gain change of a wobble signal amplitude regulation AGC is made slow. As a result, high frequency deviation of the wobble signal can be reduced even when the operation is switched from reproduction to recording, and the write clock with only small jitter can be generated.

摘要翻译： 提供了一种写入时钟生成电路，其能够以高精度检测摆动信号，并且即使当操作从再现切换到记录时也可以仅以小抖动适当地生成写入时钟。 摆动信号是通过在开始记录之后的预定时间段内使用增益控制电路逐步改变分光检测器的后级中的可变增益放大器的增益而获得的。 写入时钟信号是使用上述摆动信号生成的。 根据这种配置，可以减小刚开始记录之前和之后的摆动信号的变化，并且使摆动信号幅度调节AGC的增益变化变慢。 结果，即使当操作从再现切换到记录时，摆动信号的高频偏差也可以减小，并且可以产生仅具有小抖动的写时钟。

公开(公告)号：EP1596377A1

公开(公告)日：2005-11-16

申请号：EP03768344.8

申请日：2003-12-26

申请人： Ricoh Company, Ltd.

发明人： MAEGAWA, Hiroshi

IPC分类号： G11B7/007 ,  G11B7/005 ,  G11B7/24 ,  G11B20/10

CPC分类号： G11B27/24 ,  G11B7/24082 ,  G11B20/14 ,  G11B2020/10888 ,  G11B2220/216 ,  G11B2220/218 ,  G11B2220/2545 ,  G11B2220/2562

摘要： The present invention is structured so that a track of a recording medium is divided into a carrier wave area that is continuously wobbled by a carrier wave wobble of a specific carrier wave cycle, and an address area that is wobbled by a special wobble that has a cycle different from the carrier wave wobble and a phase determined in response to data 0 and data 1 of information stored by a wobble.

摘要翻译： 本发明被构造成使得记录介质的轨道被划分成通过特定载波周期的载波摆动连续摆动的载波区域和被具有特定摆动的特定摆动摆动的地址区域 循环与载波摆动不同并且响应于由摆动存储的信息的数据0和数据1而确定的相位。