CN1979647A - System and method for reading/writing data on optical disc using multiple spots - Google Patents

System and method for reading/writing data on optical disc using multiple spots Download PDF

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Publication number
CN1979647A
CN1979647A CN 200510128593 CN200510128593A CN1979647A CN 1979647 A CN1979647 A CN 1979647A CN 200510128593 CN200510128593 CN 200510128593 CN 200510128593 A CN200510128593 A CN 200510128593A CN 1979647 A CN1979647 A CN 1979647A
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spot
light spot
light
tracks
read
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CN 200510128593
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Chinese (zh)
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亨克·古森斯
谌达宇
刘嵘
亚历山大·麦克·凡·得·李
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皇家飞利浦电子股份有限公司
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    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/14Heads, e.g. forming of the optical beam spot or modulation of the optical beam specially adapted to record on, or to reproduce from, more than one track simultaneously
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1362Mirrors

Abstract

The invention relates to a method and system for reading/writing data on CDs by plural light points located along inner tracks to outer tracks, comprising the steps of: successively detecting whether each light point has reached the original read/written data region; if read/write operation is made from inner tracks to outer tracks, moving the light points to the adjacent position to the current outmost light point and if read/write operation is made from outer tracks to inner tracks, moving the light points to the adjacent position to the current inmost light point.

Description

用复数个光点在光盘上读/写数据的系统和方法 Reading a plurality of the light spot on the optical disk / writing data system and method

技术领域 FIELD

本发明涉及一种在光盘上读/写数据的方法和系统,更具体来说,涉及一种用复数个光点在光盘上读/写数据的方法和系统。 The present invention relates to an optical disc reading / writing data systems and methods, and more particularly, relates to a plurality of light spots on the optical disk read / write data to a method and system.

背景技术 Background technique

如今,光盘因其成本相对较低且数据存储容量相对较大而成为一种广泛用于存储多媒体音频/视频信息的数据载体。 Today, an optical disc, and because of its relatively low cost and relatively large data storage capacity become a data carrier widely used for storing multimedia audio / video information. 因此,由于存储在光盘上的数据可以更快读取,或者存储在光盘上的数据可以更快写入,所以提高数据速率已成为一个重要的改善因素。 Therefore, since the data stored on the disc can be read faster, or data stored on the disc can be written faster, so increase the data rate of improvement has become an important factor.

一种提高光驱数据速率的方法是使用多个并行读取或写入多个光盘轨道的光点。 A method for improving the data rate of the drive is reading or writing in parallel a plurality of light spots a plurality of tracks the optical disc.

由于大多数光盘的轨道结构是螺旋形的,所以光点会遇到另一光点已经读取或写入的轨道的一部分,如图1A和图1B所示。 Since most of the track structure of the optical disc is helical, the light spot will encounter another to read or write the light spot has a portion of the track, as shown in FIGS. 1A and 1B.

图1A是显示这样一种情形的示意图:光点A从区块1的起始处开始在光盘上记录/读取数据,而光点B则从区块5的起始处开始在光盘上记录/读取数据。 1A is a schematic view of such a situation: A light spot starts from the beginning of the recording block on the optical disc 1 / reading data, block the light from the point B at the beginning of the 5 recorded on the disc starts / read data. 光点A和B一直这样并行地记录/读取,直到光点A到达区块5的起始处为止,如图1B所示。 Points A and B of light has been so parallel recording / reading light spot A up until the start of the block 5, as shown in FIG. 1B arrive. 换句话说,光点A到达原先由光点B记录/读取的区块。 In other words, the light spot from the original spot A B reaches the recording / reading block. 为了避免光点A在原先由光点B记录/读取的区域上记录新的数据,此时需要转移光点。 A light spot in order to avoid recording the new data in the original point B by the optical recording / reading area, needs to be transferred at this time the spot.

这种转移通常包括将所有光点移动相同的距离。 This transfer generally involves the same distance from all the light spot moves. 这种光点转移策略的优点在于其非常容易实施,这是因为只需径向转移物镜。 The advantage of this spot displacement strategy is easy to implement in that, since only the radial transfer of the objective lens. 欧洲专利申请案第EP 0 840 294 A2号(1998年5月公开,由SamsungElectronics Co.,Ltd.提交)揭示了一种利用多个光点来进行光学拾取的多轨道扫描方法,其中就运用了这种光点转移策略。 European Patent Application No. EP 0 840 294 No. A2 (Publication 1998,. Presented by SamsungElectronics Co., Ltd) discloses a multi-track scanning method utilizing a plurality of light spots to the optical pickup, wherein on use of this spot displacement strategy.

但是其缺点在于,必须进行(Nb-1)Ng-1条轨道的转移(对于具有Nb个光点、且光点间相距Ng条轨道的系统),才能读取或写入所有数据。 However, the disadvantage that, to be transferred (Nb-1) Ng-1 track (for Nb having a light spot, and the distance between the light spot tracks Ng bar system), all in order to read or write data. 因此,这种方法的数据速率限制在每个光点的数据速率的Nb-1/Ng倍。 Thus, this method limits the data rate in the data rate of each spot of the Nb-1 / Ng times. 实际上,Ng通常为1,因而数据速率增益将限于Nb-1。 Indeed, Ng, generally 1, the data rate and thus the gain will be limited to Nb-1.

因此,我们期望能在现有光驱中实施新的读/写光盘的转移策略,以便超过上述数据速率极限,从而满足巨大的提高读/写数据速率的需求。 Therefore, we look forward to the implementation of new read / write transfer policy disc in the CD-ROM drive current to said data rate exceeds the limit, to meet the needs of a huge increase read / write data rate.

发明内容 SUMMARY

本发明的目标是提供一种用复数个光点在光盘上读/写数据的方法和系统,以便提高读/写数据速率。 Object of the present invention is to provide a reading with a plurality of light spots on the optical disk / data write method and system, in order to improve the read / write data rate.

根据本发明的一个实施例,揭示一种用复数个沿光盘内部轨道到外部轨道定位的光点而在光盘上读/写数据的方法。 According to an embodiment of the present invention, discloses an optical spot to outer tracks of the optical disk with a plurality of tracks along the internal read method / writing data on the optical disc. 该方法包括以下步骤:相继检测每个光点都已到达原先已读/写的数据区域;如果读/写是从内部轨道向外部轨道进行的,将光点移动到与当前最外部的光点相邻的位置,如果读/写是从外部轨道向内部轨道进行的,将光点移动到与当前最内部的光点相邻的位置。 The method comprises the steps of: detecting successively that each spot has reached a previously read / write data area; if the reading / writing is performed from the inner to outer tracks, the light spot moves to the current outermost spot a position adjacent to, if the reading / writing is done from outer to inner tracks, the light spot is moved to adjacent the current innermost spot location.

根据本发明的一个实施例,揭示一种用复数个沿光盘内部轨道到外部轨道定位的光点而在光盘上读/写数据的系统。 According to an embodiment of the present invention, discloses a read / write data on the optical disk system using a plurality of light spots along inner tracks to outer tracks of the optical disc positioned. 该系统包括:一检测装置,用来相继检测每个光点都已到达原先已读/写的数据区域,并产生一检测信号;和一由该检测信号触发的致动装置,用于移动光点,如果读/写是从内部轨道向外部轨道进行的,将光点移动到与当前最外部的光点相邻的位置,如果读/写是从外部轨道向内部轨道进行的,将光点移动到与当前最内部的光点相邻的位置。 The system comprising: a detecting means for detecting successively that each spot has reached a previously read / write data area, and generating a detection signal; and an actuating means is triggered by the detection signal, for moving the light point, if the reading / writing is done from inner to outer tracks, the light spot is moved to the current outermost spot position adjacent, if the reading / writing is done from outer to inner tracks, the light spot moving the light spot to the current innermost position adjacent.

在现有技术中,数据速率的提高限制在Nb-1/Ng倍,而与此相比,根据本发明的转移策略使得数据速率提高Nb倍。 In the prior art, to improve the data rate is limited to Nb-1 / Ng-fold, compared to this, according to the present invention is such that the transfer policy data rate Nb times. 换句话说,单独移动光点的转移策略可以提高在光盘上进行读/写的数据速率。 In other words, a single light spot moving transfer policy may improve read / write data rate on the optical disc.

此外,由于并非所有光点都必须同时移动相同距离,所以这种移动光点的策略易于实施,从而产生一种节省成本的解决方案。 Further, since not all the light spot must be moved the same distance at the same time, so this strategy is easy to implement movement of the spot, resulting in a cost solution.

根据以下参照图式和权利要求书对本发明的描述,本发明的其他目标和效用将变得显而易见,并且读者可全面了解本发明。 Book according to the following reference to the drawings and described in the claims of the present invention, other objects and utilities of the present invention will become apparent, and the reader can fully understand the present invention.

附图说明 BRIEF DESCRIPTION

图1A和图1B是图解说明展示一个光点遇到已由另一光点读取或写入的区域的情形的示意图。 1A and FIG. 1B is a diagram illustrating a schematic view showing a case where the light spot of the light spot by another read or write area encountered.

图2A-2D图解说明用根据本发明一个实施例的光点转移策略来对光盘进行多光点读出的各个阶段。 Figures 2A-2D illustrate various stages performed by a multi-spot readout of an optical disk according to the spot displacement strategy according to one embodiment of the present invention.

图3是图解说明展示用一个反射镜阵列来转移来自一个激光阵列的各个光点的示意图。 FIG 3 is an illustration showing a mirror array used to deflect a schematic view from the respective light spots of the laser array.

图4是图解说明展示光盘上的光点排列的示意图。 FIG 4 is a schematic diagram showing an optical disk a light spot on the array is illustrated.

图5展示反射镜随时间的遵循锯齿模式的角度转移。 Figure 5 shows the angle of the mirror follows a sawtooth pattern with the transfer time.

图6是图解说明展示用来控制光盘上的光点的闭合回路控制系统的结构的示意方块图。 FIG 6 is a schematic block diagram showing a configuration of a closed loop control system for controlling a light spot on the optical disk is illustrated.

图7是图解说明展示根据本发明一个实施例在开放回路控制下在光盘上读取数据的方法的示意流程图。 FIG 7 is a schematic illustration showing a flowchart of a method embodiment of the present invention to read data on the optical disc in an open loop controlled.

在上述图式中,相同附图标记指示相同、相似或相应的元件或功能。 In the drawings, same reference numerals indicate the same, similar or corresponding elements or functions.

具体实施方式 detailed description

下文将参照图式通过实施例来详细描述本发明的技术措施。 Hereinafter the technical measure of the invention is described in detail by way of example with reference to the drawings.

应注意,本发明既可用于读取光盘,又可用于写入光盘。 It is noted that the present invention can be used to read the disc, but also for writing the optical disc. 在本实施例中,为简略起见而使用“读取”。 In the present embodiment, for the sake of brevity and use the "read." 所属领域的技术人员应了解,本说明书中各处的“读取”都可以换成“写入”。 Those skilled in the art will appreciate that, throughout the present specification, the "reading" can be replaced with "write."

图2A至2D图解说明根据本发明一个实施例的光点转移策略来对光盘进行多光点读出的各个阶段。 2A to 2D illustrate the various stages to the read-out multi-spot light on the optical disc spot displacement strategy according to one embodiment of the present invention. 用彼此相距一条轨道的三个光点A、B、C来说明这一策略。 Apart from one another by a track of the three spots A, B, C illustrate this strategy. 光点A、光点B和光点C这三个光点沿光盘的内部轨道到外部轨道定位,例如分别在轨道T1、T2和T3上,并且沿图2A中箭头所指的方向并行地读取轨道(图2B-2D中,已读取的区域标有阴影),其中所有光点之间始终保持为沿径向方向相距至少一条轨道的不变距离。 Light points A, B and the light spot of the three light spots point C along inner tracks to outer tracks of the optical disk, for example, respectively on the tracks T1, T2 and T3, and read in parallel in the direction of the arrow in FIG. 2A track (FIG. 2B-2D, the region shaded standard has been read), which remain unchanged between all spots apart from the at least one track and along the radial direction. 检测装置相继检测每个光点的位置并产生检测信号。 Detecting means sequentially detects the position of each spot and generates a detection signal.

一旦光点A到达先前已由另一光点读取的轨道的一部分,如图2A所示,光点A读取的数据就会没用,并且会产生一个检测信号,指示必须移动光点A以便继续读取数据。 Once the light reaches the point A portion of the light spot by another previously read track, shown in Figure 2A, the data will be read spot A useless, and generates a detection signal indicative of movement of the light spot must A in order to continue to read the data. 在本实施例中,致动装置响应该检测信号移动光点A,如果读/写是从内部轨道向外部轨道进行的,那就将光点A移动到与当前最外部的光点相邻(即,下一个)的位置;如果读/写是从外部轨道向内部轨道进行的,那就将光点A移动到与当前最内部的光点相邻(即,下一个)的位置。 In the present embodiment, the actuating means in response to the movement of the light spot detection signal A, if the reading / writing is done from inner to outer tracks, then the light spot A moves to adjacent the current outermost spot ( That is, a) location; if the reading / writing is done from outer to inner tracks, then the light spot a moves to the current innermost spot adjacent (i.e., next) position. 在本实例中,如图2B所示,光点A被移动到轨道T4,即在光点C的下一个。 In the present example, shown in Figure 2B, the light spot A is moved to the track T4, i.e., the next light spot C.

应注意,术语“相邻”意谓所移动的光点将定位到当前最外部/最内部的光点的下一个,并且将与所述当前最外部/最内部的光点相距一条轨道(如图2所举的实例所示)或复数条轨道(例如,在各光点彼此相距一条以上轨道的情况下)。 Should be noted that the term "adjacent" means that the mobile light point will be located next to the current outermost spot / innermost, and the distance of one track (e.g., the current outermost / innermost spot ) or a plurality of tracks as shown in FIG. 2 example cited (e.g., in the case where a light spot over the track distance from each other).

对其他光点应用与光点A相同的策略。 Applications and other points of light A spot the same strategy. 例如,如图2C所示,光点B也遇到之前已被读取的轨道的一部分。 For example, shown in Figure 2C, a portion of the track has been encountered before the B read light spot. 与光点A相似,也将光点B移动到轨道T5,如图2D所示。 Similar to the spot A, B will also move the light spot to the track T5, as shown in FIG 2D.

关于上述策略的实施,有多种方法可以用来实施这种跳跃策略。 On the implementation of the above strategy, there are several ways to implement such a strategy jumping. 但是,重要之处在于应该单独控制每个光点。 However, it is important that it should individually control each spot.

图3是图解说明如何通过反射镜阵列来实现跳跃策略以转移双激光系统中的各个光点从而提高光驱的数据速率的示意图。 FIG 3 is a diagram illustrating how to achieve hopping strategy to transfer the mirror array through respective dual laser spot system diagram of a data rate of the drive to improve. 该系统包括一个具有两个激光源4和5的激光阵列。 The system comprises a two laser sources 4 and 5 has a laser array. 对于从该激光阵列发射的激光光束(见图3中的虚线)来说,用一个反射镜阵列来偏转这些激光光束。 For the laser beam emitted from the laser array (see dashed lines in FIG. 3), the use of a mirror array used to deflect the laser beam. 该反射镜阵列包括两个反射镜1和2。 The mirror array comprises two reflecting mirrors 1 and 2. 反射镜1偏转来自激光源5的激光光束A,而反射镜2偏转来自激光源4的激光光束B。 A mirror deflecting the laser beam from the laser source A 5, and the reflecting mirror 2 deflecting the laser beam from the laser light source 4 B. 反射镜1和2中的每个反射镜都可旋转小角度α1、α2,旋转轴3大约位于经过激光光束的光轴的平面中。 Mirror 1 and 2 each mirror can be a small angle of rotation α1, α2, the rotation shaft 3 is located approximately in the plane through the optical axis of the laser beam.

通过旋转反射镜1和2中的一个反射镜,经这个反射镜偏转后的激光光束发生变化,借此控制光盘上的相应光点。 By rotating the reflecting mirror 1 and a mirror 2 by the beam generating laser light deflecting mirror changes, thereby controlling the respective light spot on the optical disc. 例如,如果反射镜围绕轴3逆时针旋转,则光点将会朝光盘边缘移动。 For example, if the mirror is rotated counterclockwise around the shaft 3, the light spot will be moved toward the edge of the disc. 反之,光点将朝中心移动。 Conversely, the spot will move toward the center. 通过这种方式,用反射镜阵列来转移来自激光阵列的各个光点。 In this manner, with the mirror array to transfer the respective light spots from the laser array. 本发明的一个优选实施例是沿几乎为切线的方向定位各光点。 A preferred embodiment of the present invention is the positioning of each light spot along a direction almost tangent. 这样做之所以有利是因为,其使光点转移期间各组件的机械移动最小化,并因此简化了致动过程。 The reason to do this is advantageous because it makes the light spot during transfer of mechanical movement of the various components is minimized, and thus simplify the actuation process.

虽然这种转移不是从前一轨道跳跃到下一轨道的可能的最短转移,但差异非常小,并且在实践中不会产生问题。 Although this is not used to transfer a track jump to the next track in the shortest possible transfer, but the difference is very small, and does not cause problems in practice. 这意味着,旋转轴不必非常精确地对准,从而简化了反射镜阵列的构造。 This means that the rotation shaft does not have to be very precisely aligned, thereby simplifying the configuration of the mirror array.

为了使每个反射镜只反射来自一个激光源的激光光束,反射镜必须放置在靠近激光阵列、光束尚未重叠的距离处。 To make each mirror reflects only the laser beam from a laser light source, the mirror must be placed at a distance close to the laser array, yet overlapping beams. 因此,小型反射镜(例如,宽度和高度约为50-100微米)较受青睐,因为其具有这样的优点:反射镜可以非常迅速地转移,并且可以与激光阵列一起集成在同一罩壳内以形成一个组件。 Thus, a small mirror (e.g., a width and a height of about 50-100 microns) more appealing, since it has the advantage that: the mirror can be very quickly transferred, and may be integrated with the laser array in the same enclosure forming a assembly. 从而提供光学光路中一种更加简单的应用来执行本发明。 Thereby providing an optical light path of one simpler application of the present invention is performed.

该反射镜阵列也可以放置在光路中的其他位置上。 The mirror array may be placed in other positions on the optical path. 例如,为了形成互不重叠的光束,需要能形成聚焦点的望远镜。 For example, do not overlap in order to form a light beam, a need for a telescope focal point is formed. 然后,将反射镜阵列放置在这些聚焦点附近。 Then, the mirror array is placed in the vicinity of the focus point.

在上述实施例中,用反射镜阵列来转移每个光点。 In the above embodiment, the mirror array with each light spot to shift. 或者,也可以用其他构件来转移每个光点,例如用一组用来改变激光光束的定向的透镜。 Alternatively, other means may be used to transfer each spot, for example a group of lenses used to change the orientation of the laser beam. 另一种可能的解决方案是,通过利用在与光轴垂直的平面内的液晶模块来控制每个不同的相互平行又互不重叠的光束的偏转角,从而管理各个光点的转移。 Another possible solution is to control the light beam deflection angle of each different and do not overlap each other in parallel by using a liquid crystal module in a plane perpendicular to the optical axis, to manage the transfer of each spot. 此外,所述液晶模块具有恒定的折射率梯度。 Furthermore, the liquid crystal module having a constant refractive index gradient. 因此,通过改变模块上的电压来改变折射率梯度,也将改变光束角度。 Thus, by varying the voltage on the module to change a refractive index gradient, it will also change the angle of the light beam.

在本发明的实施例中,光源对应于激光阵列。 In an embodiment of the present invention, the laser light corresponding to the array. 本发明的实施例中也可以使用其他光源,例如经光栅分裂或经透镜准直的单光束激光源。 Embodiments of the invention may also be used in other light sources, for example via raster splitting or collimated by a lens of a single beam laser source. 特定而言,用反射镜阵列来偏转准直激光光束比较适合只读系统。 In particular, with the mirror array to deflect the collimated laser beam is suitable for read-only systems. 或者,也可以用声光调制器来形成光源,所述声光调制器可以将入射光束分裂成经过调制而具有不同(且可变)角度的光束或者离散激光,该离散激光的光束组合成同一光路。 Alternatively, acousto-optic modulator may be used to form the light source, the acousto-optic modulator may be split into incident beam modulated to have different (and variable) or a discrete angle of the laser beam, the laser beams are combined into discrete same optical path.

根据本发明的一实施例,最好让每个反射镜在每次跳跃之后都缓慢返回到其开始位置,因为如果光点遇到另一已读区域,则可能需要再次跳跃。 According to an embodiment of the present invention, preferably each mirror so that after each jump are slow to return to its starting position, because if the spot encounters another region has been read, may require a jump again. 否则,重复转移光点会过度增加反射镜的转移。 Otherwise, the transfer is repeated excessively increasing the transfer spot mirror. 包含物镜致动器的常规径向跟踪系统会使所有光点都保留在其各自的轨道上,而反射镜则返回到其初始位置。 All of the dots causes a radial tracking system comprising the conventional objective lens actuator are retained on their respective tracks, and the mirror returns to its initial position.

图4展示光点在光盘上的典型排列,以便解释大约位于激光光束平面内的旋转轴的选择结果。 4 shows a typical arrangement of a light spot on the optical disk, in order to explain the selection result of the rotation shaft approximately located in the plane of the laser beam. 例如,光点间相距10μm,且轨道间距为320nm(例如,根据蓝光光盘标准)。 For example, a distance between the light spot 10 m, and a track pitch of 320nm (e.g., according to the Blu-ray disc standard). 因此,各光点在一条线上,仅与轨道成较小角度。 Thus, the spots in a line, only a slight angle to the track. 在一个反射镜绕其在激光阵列的光轴平面中的旋转轴旋转之后,光点的转移与这条线垂直(如箭头所示)。 After a rotation of the mirror about its axis of rotation in the plane of the optical axis of the laser array, the light spot is transferred from this vertical line (as shown by arrow).

图5展示反射镜随时间的遵循锯齿模式的角度转移,其中,α1、α2代表反射镜的旋转角度,如实线和虚线所示。 5 shows the mirror angle of the transfer function of time following the zigzag pattern, wherein, α1, α2 representative of the rotation angle of the mirror, as shown in solid line and a broken line. 如图5所示,单独控制各反射镜。 5, each of the mirrors individually controlled. 此外,下降线代表反射镜返回到其开始位置的阶段,而急剧上升线则代表转移的阶段。 Further, decrease lines represent the mirror returns to its starting position of the stage, the stage rises sharply line represents the transfer.

在另一实施方案中,反射镜更加迅速地返回到其初始位置,然后在短时间内保持不变。 In another embodiment, the mirror more quickly returned to its initial position, and then remains constant in a short time. 取决于光盘旋转周期(revolution time)的变化(例如,取决于光驱运作模式,即恒定角速度或恒定线速度),这两种方法都可能更易实施。 Period varies depending on the disk rotation (revolution time) (e.g., depending on the drive mode of operation, i.e., a constant angular velocity or constant linear velocity), both methods may be easier to implement.

用物镜致动器来将光点聚焦到其轨道上,该物镜致动器通常是典型径向反馈回路控制系统的一部分。 The objective lens actuator to focus the light spot on its track, the objective lens actuator is typically part of a typical radial feedback loop control system.

图6是展示用来控制光盘上的光点的闭合回路控制系统的结构的示意方块图。 FIG 6 is a schematic block diagram showing a configuration of a closed loop control system for controlling a light spot on the optical disk. 该系统包括光学器件601,该光学器件601包括光路、光盘及具有光检测器和其他一些电子器件的返回光路。 The system 601 includes an optical device, the optical device 601 includes a light path, an optical disc having a return path and the light detector and some other electronic devices. 光学器件601将测量结果传输给径向跟踪误差产生器602,该径向跟踪误差产生器602产生一称为径向误差信号的电信号,该信号或多或少与光盘上的光点与数据轨道中心之间的距离成比例。 The optical device 601 to transmit the measurement result the radial tracking error generator 602, the radial tracking error generator 602 generates an electrical signal known as a radial error signal, the signal is more or less of a light spot on the optical disc and the data the distance between the center of the track in proportion. 这一距离可由径向致动器603调整,该径向致动器603沿径向方向移动物镜(即,物镜致动器)。 This distance can be adjusted radial actuator 603, the radial actuator 603 moves the objective lens in the radial direction (i.e., the objective lens actuator). 用来移动径向致动器603以使光点保留在轨道中心上并因此将径向误差减少到零所必需的力(幅度和符号)由控制器模块径向控制器604来界定。 To move the radial actuator 603 so that the light spot in the center of the track to retain the radial error and thus reduce the force necessary to zero (magnitude and sign) by the controller module controller 604 radially defined. 径向控制器604以径向误差信号作为输入,并计算输出信号,以将其输入减少到零。 The controller 604 radially radial error signal as an input, and calculates an output signal to reduce its input to zero.

径向控制器604是一个电子滤波器,其在不同频率范围中具有不同特性。 Radial electronic controller 604 is a filter having different characteristics in different frequency ranges. 这种控制器的一个典型且常用的实例是比例-积分-微分(PID)控制器,其具有:用来支配低频控制器输出的积分函数、用来支配中频输出的比例增益和用来支配高频输出的微分器。 Such a typical conventional example and the controller is a proportional - integral - derivative (PID) controller having: an integral function used to dominate the low-frequency output from the controller, the proportional gain for the IF output and to govern high disposable frequency differentiator output.

或者,也可反馈所有光点的平均跟踪误差。 Alternatively, the feedback may be the average of all of the tracking error of the light spot. 反馈回路包含顶部的低通滤波器(LPF)605,以便仅控制某一带宽内的光点的移动。 A feedback loop comprising a low-pass filter top (LPF) 605, to control the movement of the light spot is only within a certain bandwidth. 通过控制旋转反射镜的其他反馈回路(底部)来移除该带宽以外的跟踪误差部分。 To remove portions other than the tracking error by controlling the bandwidth of the feedback loop other rotating mirror (bottom). 因为反射镜小且轻,所以可以实现很宽的带宽。 Because the small mirrors and light, it is possible to achieve a wide bandwidth.

请注意,宽箭头表示信号集合,每个光点对应一个信号。 Note, broad arrows represent signal set, a signal corresponding to each spot. 信号从该光学器件开始,随后为所有光点产生径向跟踪误差。 Signal from this optical device, and then generate a radial tracking error for all of the light spot. 这些径向跟踪误差经高通滤波器(HPF)606过滤,以便仅处理频率较高的分量。 The radial tracking error by the high-pass filter (HPF) 606 filter for processing only the higher frequency components. 显然,LPF 605和HPF 606的截止频率值相似。 Obviously, LPF 605, and the value of the cutoff frequency of HPF 606 is similar. 对于经高通滤波的误差信号,将来自如图6所示的跳跃信号产生器607的跳跃信号添加到信号混合器608中。 For the high pass filtered error signal, the jump from the signal generator shown in FIG. 6 skip signal 607 is added to the signal mixer 608. 通过一组N控制器609,例如PID型控制器,每个控制器负责控制一个光点或反射镜,将信号馈送给经致动的反射镜610,而反射镜610又将各个光束偏转到光盘轨道上的正确位置。 N set by a controller 609, such as a PID controller, each controller is responsible for controlling a spot or mirror, the mirror signal is fed via the actuator 610, and each light beam deflecting mirror to the optical disk 610 in turn correct position on the track.

在上述实施例中,不但可以实施本发明,而且还通过转移光盘上的光点实现了补偿高频跟踪误差的附加功能。 In the above embodiment, the embodiment of the present invention not only can, but also to achieve the additional functions by compensating high-frequency tracking error transfer light spot on the optical disc. 通过增加LPF和HPF,将高频信号分离出来并用来调制经致动的反射镜。 By increasing the LPF and HPF, the high-frequency signal is separated out and used to modulate the actuated mirrors. 这有利于记录和读出高转速光盘。 This facilitates the recording and read-out of high speed CD-ROM.

转移光盘上的光点也会导致光检测器平面中的光点发生转移,该光检测器平面负责产生电信号,由这些电信号可产生数据信号(高频-HF-信号)、聚焦误差和径向跟踪误差信号。 Transfer light spot on the disc will result in the light spot of the light detector plane shift, the plane of the light detector is responsible for generating an electrical signal, electrical signals may be generated by the data signal (-HF- high-frequency signal), a focus error, and radial tracking error signal. 这会干扰光学信号。 This can interfere with the optical signals. 例如,可能会像典型射束沉陷(beam landing)那样导致推挽径向信号偏移。 For example, as might result in a radial push-pull signal offset like a typical beam landing (beam landing). 此可通过根据光点位移来移动光检测器而避免。 This may be avoided by moving the light spot according to the light detector by displacement.

在上述任一实施例中,都可以选择开放回路或闭合回路控制来实施光点转移。 In any embodiment, you can choose an open loop or closed-loop control implemented spot displacement. 开放回路控制和闭合回路控制之间的一个差别在于,在开放回路方案中,通过向致动器馈送预定电信号来实现旋转,而对于闭合回路颠倒跳跃而言,进入致动器的电信号取决于自某一非静态光点测得的径向误差信号。 One difference between the open loop control and closed loop control wherein, in an open loop embodiment, the rotation is achieved by feeding a predetermined electric signal to the actuator, and for the closed loop reverse jump, the electrical signal into the actuator depends in a non-static spot from the radial error signal is measured.

图7是展示根据本发明一个实施例在开放回路控制下用复数个沿光盘内部轨道向外部轨道定位的光点而在光盘上读/写数据的方法的示意流程图。 FIG 7 is a schematic flowchart showing one case on an optical disk is read by a plurality of positioning the optical disc to the outside of the track along the track the light spot in the interior of the open loop control / data write method of the present invention. 在步骤S710中,相继检测每个光点是否都已到达先前已读/写的数据区域。 In step S710, detecting whether each successive spot has reached a previously read / write data region. 然后,在步骤S720中,如果读/写是从内部轨道向外部轨道进行的,那就将所检测的光点移动到与当前最外部的光点相邻的位置;如果读/写是从外部轨道向内部轨道进行的,那就将所检测的光点移动到与当前最内部的光点相邻的位置。 Then, in step S720, the if the reading / writing is performed from the inner to outer tracks, then the detected light spot is moved to the outermost position of the light spot adjacent to the current; if the read / write from outside tracks to inner tracks, then the detected movement of the light spot of the light spot adjacent to the current innermost position. 因此,光点转移得以完成。 Thus, the spot transfer is completed. 开放回路控制下的方法一般更易执行。 Under the open loop control method is generally easier to perform. 在闭合回路控制中,在转移过程中测量移动光点的位置,并根据所测量的信号控制每个光点的移动。 In closed loop control, the measurement position of the light spot in the transfer process, and controls the movement of each spot based on the measured signal.

结果表明,对于使用本发明的双光束蓝光光盘系统(Ng=1,假设跳跃时间无限短)而言,数据速率提高到1.9倍,而用传统方法,数据速率将下降到1倍以下。 The results show that using the dual beam system of the present invention, a Blu-ray disc (Ng = 1, the jump time is assumed that infinitely short), the data rate to increase by 1.9 times, while the conventional method, the data rate would drop to 1 times. 此外,本发明可应用到几乎所有具有多光点的光学存储系统中,例如CD、DVD和蓝光光驱。 Further, the present invention can be applied to almost all of the optical storage system having a plurality of light points, for example CD, DVD and Blu-ray drive.

上述实施例只是例示性的,并且不希望它们限制本发明的技术方法。 The above-described embodiments are merely illustrative and are not intended to limit their art methods of the invention. 虽然已参照优选实施例详细描述了本发明,但所属领域的技术人员将了解,可在不偏离本发明技术方法的精神和范畴的情况下修改或等同替换本发明的技术方法,这些修改或等同替换也属于本发明权利要求书的保护范畴。 While there has been described in detail the present invention with reference to preferred embodiments, those skilled in the art will appreciate, may be modified or equivalents art methods of the present invention without departing from the spirit and scope of the technical methods of the present invention, these modifications or equivalent Alternatively the claims also belong to the scope of protection of the claims of the present invention.

Claims (12)

  1. 1.一种用复数个沿一光盘的内部轨道到外部轨道而定位的光点在所述光盘上读/写数据的方法,所述方法包括以下步骤:相继检测每个光点都已到达原先已读/写的一数据区域,如果所述读/写是从内部轨道向外部轨道进行的,将所述光点移动到与当前最外部的光点相邻的一位置;如果所述读/写是从外部轨道向内部轨道进行的,将所述光点移动到与当前最内部的光点相邻的一位置。 A light spot in an optical disc with a plurality of inner tracks to outer tracks positioned on said optical disk reading / writing data, the method comprising the steps of: detecting successively that each spot has reached the original read / write a data area, if the reading / writing is performed from the inner to outer tracks, the light spot is moved to the current outermost spot adjacent to a location; if the read / writing is done from outer to inner tracks, the light spot is moved to the current innermost spot adjacent to a position.
  2. 2.如权利要求1所述的方法,进一步包括以下步骤:移动光检测器以跟随所述光点的移动,测量所述光点的位置。 2. The method according to claim 1, further comprising the step of: moving the optical detector to follow the movement of the light spot, the measurement position of the light spot.
  3. 3.如权利要求1所述的方法,其中所有所述光点之间始终保持为沿径向方向至少一条轨道的不变距离。 The method according to claim 1, wherein the distance is kept constant in the radial direction between the at least one track of all of the light spot.
  4. 4.如权利要求1所述的方法,其中所述移动步骤是旋转一用来偏转一单一激光光束的反射镜。 4. The method according to claim 1, wherein said moving step is rotated by a deflecting mirror for a single laser beam.
  5. 5.一种用复数个沿一光盘的内部轨道到外部轨道定位的光点而在所述光盘上读/写数据的系统,所述系统包括:一检测装置,用来相继检测每个光点都已到达先前已读/写的一数据区域,并产生一检测信号,一由所述检测信号触发的致动装置,用来移动所述光点,如果所述读/写是从内部轨道向外部轨道进行的,将所述光点移动到与当前最外部的光点相邻的一位置;如果所述读/写是从外部轨道向内部轨道进行的,将所述光点移动到与当前最内部的光点相邻的一位置。 A light spot with the outer tracks of the optical disk along a plurality of tracks and internal read / write data on the optical disc, the system comprising: a detecting means for detecting successively that each spot have arrived previously read or written to a data area /, and generating a detection signal, a detection signal is triggered by the actuating means for moving the light spot if the reading / writing is from the inside track to the the outer tracks, the light spot is moved to the current outermost spot position adjacent to a;, moving the light spot if the reading / writing is done from outer to inner tracks to current spot innermost position adjacent pair.
  6. 6.如权利要求5所述的系统,进一步包括一连接到所述致动装置的旋转反射镜阵列,用来偏转激光光束以产生所述复数个光点。 The system as claimed in claim 5, further comprising a rotating mirror array coupled to said actuating means, for deflecting the laser beam to produce said plurality of light spots.
  7. 7.如权利要求5所述的系统,进一步包括一连接到所述致动装置的液晶模块,用来偏转激光光束。 7. The system of claim 5, further comprising a liquid crystal module is connected to the actuating device for deflecting the laser beam.
  8. 8.如权利要求5所述的系统,其中所有所述光点之间始终保持为沿径向方向至少一条轨道的不变距离。 8. The system according to claim 5, wherein the distance is kept constant in the radial direction between the at least one track of all of the light spot.
  9. 9.如权利要求6所述的系统,其中所述反射镜阵列的旋转轴实质上位于经过所述激光光束的一光轴的平面中。 9. The system according to claim 6, wherein said rotary shaft is substantially mirror array lies in a plane through an optical axis of the laser beam.
  10. 10.如权利要求6所述的系统,其中所述反射镜阵列与发射所述激光光束的激光源集成在一起。 10. The system according to claim 6, wherein said array of mirrors and the laser source emitting the laser beam integrated.
  11. 11.如权利要求6所述的系统,其中所述激光光束是通过用一光栅或一声光调制器来分裂一单一激光源而形成。 11. The system according to claim 6, wherein said laser beam is formed by a grating or an acousto-optic modulator is used to split a single laser source through.
  12. 12.如权利要求6所述的系统,其中用来在旋转之后将所述旋转反射镜阵列中的每个反射镜返回到其初始位置的时间取决于所述光盘的旋转周期。 12. The system according to claim 6, wherein after rotation for each rotation of the mirror in the mirror array is returned to its initial rotational position depends on the cycle time of the disc.
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CN 200510128593 CN1979647A (en) 2005-11-29 2005-11-29 System and method for reading/writing data on optical disc using multiple spots
TW95114170A TW200741689A (en) 2005-11-29 2006-04-20 System and method for reading/writing data on optical disc using multiple spots
EP20060831905 EP1958192A1 (en) 2005-11-29 2006-11-23 System and method of reading/writing data on an optical disc by a plurality of spots
JP2008541889A JP2009517793A (en) 2005-11-29 2006-11-23 System and method for reading / writing data on the optical disc by a plurality of spots
CN 200680044744 CN101317223A (en) 2005-11-29 2006-11-23 System and method for reading/writing data on optical disk by a plurality of light spots
PCT/IB2006/054398 WO2007063458A1 (en) 2005-11-29 2006-11-23 System and method of reading/writing data on an optical disc by a plurality of spots
KR20087015658A KR20080078020A (en) 2005-11-29 2006-11-23 System and method of reading/writing data on an optical disc by a plurality of spots
BRPI0619048A2 BRPI0619048A2 (en) 2005-11-29 2006-11-23 method and system for reading / writing data on an optical disc

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JP2009517793A (en) 2009-04-30 application
EP1958192A1 (en) 2008-08-20 application

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