-
1.发明授权公开(公告)号：US06891868B2
公开(公告)日：2005-05-10
申请号：US09851287
申请日：2001-05-08
IPC分类号： H01S5/068 , H01S5/0683 , H01S3/00
CPC分类号： H01S5/0683 , H01S5/06817
摘要： In order to provide a low noise laser beam, a noise reducing feedback network is provided which creates a noise reducing signal and provides that signal to the laser itself. In order to produce the noise reducing signal, the operation of the laser is monitored and the feedback signal is a direct result of this monitoring. Monitoring is accomplished by a fast-forward sense detector, which receives a portion of the laser beam from the operating laser. The output from this fast-forward sense detector is provided to an amplifier which inverts and amplifies the signal. A noise reduction feedback network then receives the amplified signal, appropriately filters this signal, and provides it to the laser itself so as to reduce noise in the laser-beam for the frequency band of importance for reading the recorded data from the optical medium. The noise reduction feedback signal further has sufficiently high impedance so as to not disturb the traditional CW operation of the laser and to avoid interference with the traditional RF modulation of the laser.
摘要翻译： 为了提供低噪声激光束，提供降噪反馈网络，其创建降噪信号并将该信号提供给激光器本身。 为了产生降噪信号，监视激光的操作，反馈信号是该监视的直接结果。 监视是通过快进检测器实现的，该检测器从操作激光器接收激光束的一部分。 来自该快进感测检测器的输出被提供给反相和放大信号的放大器。 然后，降噪反馈网络接收放大的信号，适当地对该信号进行滤波，并将其提供给激光器本身，以便降低对于从光学介质读取记录数据的重要频带的激光束中的噪声。 噪声降低反馈信号进一步具有足够高的阻抗，以便不干扰激光器的传统CW操作并避免干扰传统的激光的RF调制。
-
2.发明授权Optically readable record carrier with track undulations for producing a synchronizing clock signal and apparatus for forming such track 失效具有轨道起伏的光学可读记录载体，用于产生同步时钟信号和用于形成这种轨道的装置
公开(公告)号：US4972401A
公开(公告)日：1990-11-20
申请号：US224085
申请日：1989-01-17
CPC分类号： G11B7/24082 , G11B20/1419 , G11B20/1423 , G11B7/004
摘要： An optically readable record carrier for storing digitally coded information having a power spectrum with a substantially zero level at a predetermined frequency. The information is recorded on and/or reproduced from substantially parallel elongated tracks on the record carrier which have a periodic undulation at the aforesaid predetermined frequency. Such undulation generates a clock signal for synchronizing the recording and/or reproduction of the digitally encoded information on the tracks, and does not interfere with the recording or reproduction of such information. Apparatus is disclosed for forming such tracks on the record carrier.
摘要翻译： 一种光学可读记录载体，用于以预定频率存储具有基本零电平的功率谱的数字编码信息。 信息被记录在记录载体上的基本上平行的细长轨道上和/或从上述预定频率具有周期性波动的再现。 这种波动产生用于使轨道上的数字编码信息的记录和/或再现同步的时钟信号，并且不干扰这种信息的记录或再现。 公开了用于在记录载体上形成这种轨道的装置。
-
3.发明授权Optical disk tracking and seeking systems specific track formats using wobbled pits 失效光盘跟踪和寻找使用摆动凹坑的特定轨道格式
公开(公告)号：US4879708A
公开(公告)日：1989-11-07
申请号：US147906
申请日：1988-01-25
CPC分类号： G11B7/0938 , G11B7/00745 , G11B7/08517 , G11B7/08541
摘要： An optical disk recording system including a record medium is disclosed for providing an accurate track crossing count and an accurate track following signal. A first embodiment utilizes off-centered wobbled areas located in the headers of the record medium. The high frequency content of a first signal is combined with the low frequency content of a second signal, which is generated using the wobbled areas. In another embodiment, light-reflective discontinuities are provided in the header areas of the record medium. A qualifier and an AGC are utilized in providing a corrected track following signal. In still another embodiment, reflective discontinuities are located in the servo areas of the record medium. In such an embodiment, it is preferred that there is a fixed gain adjustment to a radial push-pull signal. With regard to each of the three aforesaid embodiments, a track following signal is corrected to compensate for aberrations that are caused by a shift of the light beam returned from the record medium surface. In yet another embodiment, the track following signal is generated using only the central aperture or wobble signal. In this embodiment, it is preferred that three pits be utilized in connection with the track following operation. The three pits are provided in two servo bytes of information located in the servo areas. Two of the three bits are wobble pits and the third pit is used in clocking.
摘要翻译： 公开了一种包括记录介质的光盘记录系统，用于提供准确的轨道交叉计数和准确跟踪信号。 第一实施例使用位于记录介质的头部中的偏心摆动区域。 第一信号的高频内容与使用摆动区域产生的第二信号的低频内容组合。 在另一个实施例中，在记录介质的标题区域中提供光反射不连续性。 使用限定符和AGC来提供校正后的跟踪信号。 在另一个实施例中，反射不连续性位于记录介质的伺服区域中。 在这样的实施例中，优选的是对径向推挽信号进行固定增益调整。 对于上述三个实施例中的每一个，对跟踪跟踪信号进行校正，以补偿由从记录介质表面返回的光束的偏移引起的像差。 在另一个实施例中，仅使用中心孔径或摆动信号产生跟踪信号。 在该实施例中，优选地，跟踪跟踪操作结合使用三个凹坑。 三个凹坑位于伺服区域的两个伺服字节的信息中。 三位中的两位是摆动凹坑，第三个凹坑用于计时。
-
4.发明授权Optical disk tracking and seeking systems specific track formats using discontinuities 失效光盘跟踪和寻找使用不连续性的特定轨道格式
公开(公告)号：US4879707A
公开(公告)日：1989-11-07
申请号：US148028
申请日：1988-01-25
CPC分类号： G11B7/0938 , G11B7/00745 , G11B7/08517 , G11B7/08541
摘要： An optical disk recording system including a record medium is disclosed for providing an accurate track crossing count and an accurate track following signal. A first embodiment utilizes off-centered wobbled areas located in the headers of the record medium. The high frequency content of a first signal is combined with the low frequency content of a second signal, which is generated using the wobbled areas. In another embodiment, light-reflective discontinuities are provided in the header areas of the record medium. A qualifier and an AGC are utilized in providing a corrected track following signal. In still another embodiment, reflective discontinuities are located in the servo areas of the record medium. In such an embodiment, it is preferred that there be a fixed gain adjustment to a radial push-pull signal. With regard to each of the three aforesaid embodiments, a track following signal is corrected to compensate for aberrations that are caused by a shift of the light beam returned from the record medium surface. In yet another embodiment, the track following signal is generated using only the central aperture or wobble signal. In this embodiment, it is preferred that three pits be utilized in connection with the track following operation. The three pits are provided in two servo bytes of information located in the servo areas. Two of the three pits are wobble pits and the third pit is used in clocking.
摘要翻译： 公开了一种包括记录介质的光盘记录系统，用于提供准确的轨道交叉计数和准确跟踪信号。 第一实施例使用位于记录介质的头部中的偏心摆动区域。 第一信号的高频内容与使用摆动区域产生的第二信号的低频内容组合。 在另一个实施例中，在记录介质的标题区域中提供光反射不连续性。 使用限定符和AGC来提供校正后的跟踪信号。 在另一个实施例中，反射不连续性位于记录介质的伺服区域中。 在这样的实施例中，优选的是对径向推挽信号进行固定增益调整。 对于上述三个实施例中的每一个，对跟踪跟踪信号进行校正，以补偿由从记录介质表面返回的光束的偏移引起的像差。 在另一个实施例中，仅使用中心孔径或摆动信号产生跟踪信号。 在该实施例中，优选地，跟踪跟踪操作结合使用三个凹坑。 三个凹坑位于伺服区域的两个伺服字节的信息中。 三个凹坑中的两个是摆动凹坑，第三个凹坑用于计时。
-
公开(公告)号：US4866686A
公开(公告)日：1989-09-12
申请号：US1293
申请日：1987-01-07
申请人： Johannes J. Verboom
发明人： Johannes J. Verboom
CPC分类号： G11B7/24085 , G11B7/08505 , G11B7/24
摘要： The recording surface of an optical record carrier (1) is divided into a succession of first (A) and second (B) annular zones, each including a plurality of substantially concentric information tracks. The tracks in each zone (A) include radially aligned first control words (13) and the tracks in the annular zones (B) include radially aligned second control words (14), the structures of the first and second control words being distinguishable from each other. An optical scanning device projects a beam which as it scans the tracks reads the control words and a detection circuit generates a measurement signal V.sub.m upon each passage of the beam from one zone to another. The measurement signal can be utilized to rapidly address the scanning beam to any of the annular zones.
-
公开(公告)号：US5574706A
公开(公告)日：1996-11-12
申请号：US270511
申请日：1994-06-28
CPC分类号： G11B7/094 , G11B7/0945
摘要： During recording or reading of data in an optical record carrier such as a disc, focus is optimized by adding a focus offset signal to the focus servo error signal. Each frame contains pre-formatted control marks in a servo field, and reference data marks recorded there at a time of data recording. The focus offset signal is optimized by spacing the reference data marks a distance as close as any data marks between which a zero or non-recorded position must be resolved, and taking samples of the optical readout signal as the optical scanning beam passes over or adjacent the reference marks. Four samples are used, taken between the peaks of the signal corresponding to the two reference data marks.
摘要翻译： 在记录或读取诸如光盘的光学记录载体中的数据时，通过向聚焦伺服误差信号添加聚焦偏移信号来优化聚焦。 每个帧在伺服字段中包含预格式化的控制标记，以及在数据记录时记录的参考数据标记。 通过将参考数据标记的距离与其中必须解除零或非记录位置的任何数据标记之间的距离进行优化，并且当光学扫描光束通过或相邻时获取光学读出信号的采样来优化聚焦偏移信号 参考标记。 在与两个参考数据标记相对应的信号的峰值之间采用四个样本。
-
7.发明授权Track format for use with an optical record carrier having a varying track pitch 失效用于具有变化轨道间距的光学记录载体的轨迹格式
公开(公告)号：US5270991A
公开(公告)日：1993-12-14
申请号：US546390
申请日：1990-06-29
申请人： Johannes J. Verboom
发明人： Johannes J. Verboom
CPC分类号： G11B7/0938
摘要： The present invention provides a track format for an optical record carrier that is useful in producing a tracking signal with a substantially constant slope at its zero-crossing point for a range of track pitches. The preferred embodiment of track format is also useful in producing a tracking signal that has a substantially constant amplitude over a range of track pitches. The track format, in the preferred embodiment, employs wobbled pits. The sequence in which the wobbled pits occur alternates between adjacent tracks and the offset of the wobbled pits with respect to the center line of a track remain constant regardless of the track pitch. The preferred embodiment of the track format also includes a reference pit that is used to establish the threshold detection level for the read electronics. The location of the reference alternates between tracks to reduce the effect of radial interference on the signal produced using the reference pit and thereby allow an optimal threshold level to be established.
摘要翻译： 本发明提供了一种光学记录载体的轨道格式，其可用于在一系列轨道间距的过零点处产生具有基本恒定斜率的跟踪信号。 轨道格式的优选实施例也可用于产生在轨道间距范围上具有基本恒定振幅的跟踪信号。 轨道格式在优选实施例中采用摆动凹坑。 波动凹坑发生的序列在相邻轨道之间交替，并且波动凹坑相对于轨道的中心线的偏移保持恒定，而与轨道间距无关。 磁道格式的优选实施例还包括用于建立读取电子装置的阈值检测电平的参考凹坑。 参考的位置在轨道之间交替，以减少径向干扰对使用参考凹坑产生的信号的影响，从而允许建立最佳阈值水平。
-
公开(公告)号：US5023857A
公开(公告)日：1991-06-11
申请号：US243400
申请日：1988-09-12
申请人： Johannes J. Verboom
发明人： Johannes J. Verboom
CPC分类号： G11B7/24085 , G11B27/19 , G11B27/3027 , G11B7/0953
摘要： An optical information recording and/or read system comprises an optically readable record carrier (1) and an optical read and/or recording apparatus (FIG. 2). The record carrier (1) is provided with substantially concentric tracks (2). The record carrier (1) is divided into sectors (4). In the tracks of each sector address information is recorded by means of prior recorded radially juxtaposed address information patterns (8). The read and/or recording apparatus (FIG. 2) comprises a driver (20, 21) for rotating the record carrier (1), scanner (23, 25) for scanning the tracks (3) with a radiation beam (2) for the purpose of recording and/or reading, a closed-loop tracking system (23, 26) for keeping the radiation beam (24) aimed at the track (6) to be scanned, and an angular-position-detection system (23, 26, 27) for determining the angular position of the record carrier (1). The recording and/or read apparatus determine eccentricity-error (23, 26, 27, 50) by deriving a correction signal (Vc) from the sector addresses read while the tracking system is inoperative which correction signal is related to the radial displacement of the point of incidence of the radiation beam (24) of the record carrier (1) as a result of an eccentric position of the center of rotation (22) and out-of-roundness of the information tracks. When the tracking system is operative the correction signal (Vc) is employed as a control signal for an open-loop control system to compensate for the radial error caused by eccentricity and out-of-roundness.
-
9.发明授权Tracking and seeking system for use with an optical record carrier having a wobbled track format 失效跟踪和寻找系统，用于具有摆动轨道格式的光学记录载体
公开(公告)号：US4959823A
公开(公告)日：1990-09-25
申请号：US410357
申请日：1989-09-21
CPC分类号： G11B7/0938 , G11B7/00745 , G11B7/08517 , G11B7/08541
摘要： An optical disk recording system including a record medium is disclosed for providing an accurate track crossing count and an accurate track following signal. A first embodiment utilizes off-centered wobbled areas located in the headers of the record medium. The high frequency content of a first signal is combined with the low frequency content of a second signal, which is generated using the wobbled areas. In another embodiment, light-reflective discontinuities are provided in the header areas of the record medium. A qualifier and an AGC are utilized in providing a corrected track following signal. In still another embodiment, reflective discontinuities are located in the servo areas of the record medium. In such an embodiment, it is preferred that there be a fixed gain adjustment to a radial push-pull signal. With regard to each of the three aforesaid embodiments, a track following signal is corrected to compensate for aberrations that are caused by a shift of the light beam returned from the record medium surface. In yet another embodiment, the track following signal is generated using only the central aperture or wobble signal. In this embodiment, it is preferred that three pits be utilized in connection with the track following operation. The three pits are provided in two servo bytes of information located in the servo areas. Two of the three pits are wobble pits and the third pit is used in clocking.
摘要翻译： 公开了一种包括记录介质的光盘记录系统，用于提供准确的轨道交叉计数和准确跟踪信号。 第一实施例使用位于记录介质的头部中的偏心摆动区域。 第一信号的高频内容与使用摆动区域产生的第二信号的低频内容组合。 在另一个实施例中，在记录介质的头部区域中提供光反射不连续性。 使用限定符和AGC来提供校正后的跟踪信号。 在另一个实施例中，反射不连续性位于记录介质的伺服区域中。 在这样的实施例中，优选的是对径向推挽信号进行固定增益调整。 对于上述三个实施例中的每一个，对跟踪跟踪信号进行校正，以补偿由从记录介质表面返回的光束的偏移引起的像差。 在另一个实施例中，仅使用中心孔径或摆动信号产生跟踪信号。 在该实施例中，优选地，跟踪跟踪操作结合使用三个凹坑。 三个凹坑位于伺服区域的两个伺服字节的信息中。 三个凹坑中的两个是摆动凹坑，第三个凹坑用于计时。
-
公开(公告)号：US4802154A
公开(公告)日：1989-01-31
申请号：US714585
申请日：1985-03-21
IPC分类号： G11B7/004 , G11B7/0045 , G11B7/005 , G11B7/013 , G11B20/14 , G11B27/36 , G11B7/00 , G11B20/12
CPC分类号： G11B7/24085 , G11B20/1419 , G11B20/1426 , G11B27/36 , G11B7/004 , G11B7/0045 , G11B7/005
摘要： A set of high density codes for optical recording of binary data. The data bits of each set are encoded into a block code having a plurality of symbols, each symbol having a plurality of symbol position with an even number of holes with the constraint that there be at least two symbol positions between holes or groups of holes. Additionally, a least one hole is never recorded at a predetermined boundary symbol position. This "empty" symbol position permits symbol position dimensions to be reduced while maintaining good read margins to provide high density recording.
摘要翻译： 一组用于二进制数据光记录的高密度码。 每组的数据位被编码成具有多个符号的块代码，每个符号具有多个具有偶数个孔的符号位置，其限制在孔或孔组之间至少有两个符号位置。 此外，至少一个孔不会在预定的边界符号位置记录。 这个“空”符号位置允许缩小符号位置尺寸，同时保持良好的读取余量以提供高密度记录。
-
-
-
-
-
-
-
-
-
搜索结果
38 条记录 (耗时 0.024 秒)