CN100585711C - Device and method for discriminating optical disk type - Google Patents
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Abstract
Description
技术领域 technical field
本发明是有关于一种判别光盘的种类的装置及其方法,且特别是有关于一种利用聚焦误差讯号(Focus Error signal,FE signal)的S曲线(S-curve)的宽度值来判别光盘的种类的装置及其方法。The present invention relates to a device and method for discriminating the type of optical disc, and in particular to a method for discriminating optical discs by using the width value of the S-curve (S-curve) of a Focus Error signal (FE signal) Types of devices and methods thereof.
背景技术 Background technique
随着光盘储存技术的进步,目前,使用者可以使用的光盘种类越来越多,而且光盘所能储存的资料容量也越来越大。然而,针对不同种类的光盘,若一台读取光盘的装置不能同时读取各种不同种类的光盘,将导致使用者需购买不同的读取光盘的装置。如此对使用者而言,将造成金钱的浪费;且对地球资源而言,也会造成材料的浪费。因此,许多读取光盘的装置中具有判别光盘种类的装置,使用者仅需使用一台读取光盘的装置便能读取不同种类的光盘。With the advancement of optical disc storage technology, there are more and more types of optical discs available to users at present, and the data capacity that can be stored in optical discs is also increasing. However, for different types of optical discs, if a device for reading optical discs cannot simultaneously read various types of optical discs, users will need to purchase different devices for reading optical discs. This will cause a waste of money for the user; and a waste of materials for the earth's resources. Therefore, many devices for reading optical discs have devices for distinguishing types of optical discs, and users only need to use one device for reading optical discs to read different types of optical discs.
传统判别光盘种类的装置及其方法为利用光盘的厚度来判别其种类。请参照图1与图2。图1是传统判别光盘种类的装置的一种实施例。图2是使用传统判别光盘种类的装置的RFSUM信号波形图。此装置包括光学读取单元10、控制单元11与马达驱动器12。控制单元11耦接于光学读取单元10与马达驱动器12,马达驱动器12耦接于光学读取单元10。光学读取单元10具有多个激光光源,用于发射任一激光至光盘13,检测到由光盘13所反射回来的激光后将其转换为检测信号det_sig。控制单元11用于控制光学读取单元10开启任一个激光光源,还用于控制马达驱动器12驱动光学读取单元10中的物镜102移动。当光学读取单元10在移动时,控制单元11根据检测信号det_sig计算出RFSUM信号。其中,RFSUM信号的峰值A1是由光盘13表层所反射的激光形成的,峰值A2是由光盘13的数据层所反射的激光形成的。控制单元11会计算峰值A1与A2之间的时间差T2-T1(参见图2),并根据该时间差T2-T1计算光盘13的厚度,以此来判断光盘13的种类。The conventional device and method for identifying the type of an optical disc utilizes the thickness of the optical disc to identify the type. Please refer to Figure 1 and Figure 2. FIG. 1 is an embodiment of a conventional device for discriminating the type of an optical disc. FIG. 2 is a waveform diagram of an RFSUM signal using a conventional apparatus for discriminating types of optical discs. The device includes an
请继续参照图1与图2。光学读取单元10包括:光盘(CD)激光光源100A、数字影音光盘(DVD)激光光源100B、聚焦致动器(focus actuator)101、物镜102、分光器(beam splitter)103与光检测器104。控制单元11包括数字信号处理单元110、微处理器111与光盘厚度计算单元112。其中,聚焦致动器101耦接于马达驱动器12。CD激光光源100A与DVD激光光源100B受控于控制单元11,当CD激光光源100A(或DVD激光光源100B)被控制单元11开启时,其发射出CD激光(或DVD激光)。聚焦致动器101接收马达驱动器12向其发送的聚焦驱动电压信号,以使物镜102匀速移动。在物镜102移动的过程中,由CD激光光源100A(或DVD激光光源100B)发射的CD激光(或DVD激光)会聚焦在光盘13的表层与数据层。物镜102用来收集由CD激光光源100A(或DVD激光光源100B)发射的激光和由光盘13所反射的CD激光(或DVD激光)。分光镜103将由CD激光光源100A(或DVD激光光源100B)发射的CD激光(或DVD激光)与由光盘13所反射的CD激光(或DVD激光)分开,并将由CD激光光源100A(或DVD激光光源100B)发射的CD激光(或DVD激光)送至物镜102,将由光盘13所反射的CD激光(或DVD激光)送至光检测器104。光检测器104用于检测由光盘13所反射的CD激光(或DVD激光)并将其转换为检测信号det_sig后发送给数字处理信号单元110。数字信号处理单元110根据检测信号det_sig计算出RFSUM信号。光盘厚度计算单元112用于计算RFSUM信号的峰值A1与A2的时间差T2-T1,并根据此时间差T2-T1计算出光盘13的厚度,以此来判别光盘13的种类。微处理器111用于控制光学读取单元10开启激光光源100A或100B。Please continue to refer to FIG. 1 and FIG. 2 .
上述传统判别光盘种类的装置容易受到光盘13本身差异性的影响或聚焦致动器101与马达驱动器12制造变异上的影响,导致时间差T2-T1会有误差,从而无法判别光盘13的种类。另外,由于光盘13表层的反射率很低,也有可能导致光学读取单元10找不到光盘13表层的位置。The above-mentioned traditional device for identifying the type of optical disc is easily affected by the discrepancy of the
为了改善传统利用光盘厚度来判别光盘种类的装置及其方法的缺点,专利号为台湾专利I257605号的发明提供了一种利用波长特性来判别光盘种类的装置及其方法。其原理为利用不同刻录凹痕(pit)深度的光盘对不同波长的激光光源会有不同的反射率这一特点来判别光盘种类。但是,此方法必须将由激光光源发射的激光聚焦于光盘上,才能判别光盘种类,而这样做有可能会造成光盘的读取时间过久的现象发生。In order to improve the shortcomings of the traditional device and method for discriminating the type of disc by using the thickness of the disc, the invention of Taiwan Patent No. I257605 provides a device and method for discriminating the type of disc by using wavelength characteristics. The principle is to use the feature that optical discs with different recording pit depths have different reflectivity to laser light sources with different wavelengths to identify the type of optical disc. However, in this method, the laser light emitted by the laser light source must be focused on the optical disc to determine the type of the optical disc, and doing so may cause the phenomenon that the reading time of the optical disc is too long.
专利号为台湾专利I397969号的发明提供了另一种利用光盘厚度来判别光盘种类的装置及其方法。但是,应用此方法后,若其光学偏移角度不一致,则有可能会造成误判的情况。而专利号为台湾专利I227867号的发明则提供了一种利用特定光学读取头的光学特性来判别光盘种类的装置及其方法。然而,此方法的缺点在于必须使用特定的光学读取头,而且该方法容易受到噪声的影响而造成误判的情况。专利号为台湾专利第I260000号的发明提供了一种使用反射率和光盘厚度来判别光盘种类的装置及其方法。然而,此方法依然有利用光盘厚度判别光盘种类的方法与利用反射率特性判别光盘种类的方法的缺点存在。因为,利用光盘的反射率来判别光盘种类依然会因为光盘之间的差异性而导致误判光盘种类的情况发生。The invention with the patent number of Taiwan Patent No. I397969 provides another device and method for discriminating the type of optical disc by using the thickness of the optical disc. However, after applying this method, if the optical offset angles are inconsistent, it may cause misjudgment. The invention whose patent number is Taiwan Patent No. I227867 provides a device and method for discriminating the type of an optical disc by utilizing the optical characteristics of a specific optical pickup head. However, the disadvantage of this method is that a specific optical pickup head must be used, and this method is easily affected by noise, resulting in misjudgment. The invention with the patent number of Taiwan Patent No. I260000 provides a device and method for discriminating the type of optical disc by using the reflectivity and the thickness of the optical disc. However, this method still has the disadvantages of the method of using the thickness of the disc to identify the type of the disc and the method of using the reflectivity characteristic to identify the type of the disc. Because, using the reflectivity of the optical disc to determine the type of the optical disc will still lead to misjudgment of the type of the optical disc due to the differences between the optical discs.
美国早期公开案第20050068873号提供了另一种利用反射率特性来判别光盘种类的装置及其方法。其原理为通过比较不同激光所产生的聚焦误差信号的峰值来判别光盘的种类。但是,此法依然很容易受到光盘的差异性影响而造成反射率不敏感,进而发生误判光盘种类的情况。US Early Publication No. 20050068873 provides another device and method for discriminating the type of an optical disc by using reflectivity characteristics. The principle is to distinguish the type of optical disc by comparing the peak values of focus error signals generated by different lasers. However, this method is still easily affected by differences in optical discs, resulting in insensitivity to reflectivity, and misjudging the type of optical discs.
美国专利第5986985号提供了另一种利用反射率特性判别光盘种类的装置及其方法。其原理为利用不同激光所产生的聚焦误差信号的峰值与预设的门坎值比较来判别光盘的种类,或是利用不同激光所产生的聚焦误差信号峰值的比值来判别光盘的种类。然而,此法也会产生因光盘差异性而导致反射率不敏感,进而发生误判光盘种类的情况。US Patent No. 5,986,985 provides another device and method for discriminating the type of an optical disc by using reflectance characteristics. The principle is to use the peak values of focus error signals generated by different lasers to compare with a preset threshold value to determine the type of optical disc, or to use the ratio of the peak values of focus error signals generated by different lasers to determine the type of optical disc. However, this method also produces insensitivity to the reflectivity due to differences in optical discs, and then misjudgment of the type of optical disc occurs.
美国早期公开案第20030039189号提供了另一种利用反射率特性来判别光盘种类的装置及其方法。此方法仅利用光盘(CD)激光所产生的聚焦误差信号的峰值与预设的门坎值比较来判别光盘的种类。然而,此方法更容易受到光盘差异性的影响而导致反射率不敏感,进而发生误判光盘种类的情况。US Early Publication No. 20030039189 provides another device and method for discriminating the type of an optical disc by using reflectivity characteristics. This method only compares the peak value of the focus error signal generated by the CD laser with a preset threshold value to determine the type of the CD. However, this method is more likely to be affected by disc discrepancies, resulting in insensitivity to the reflectivity, and misjudging the disc type.
综合以上所述,现有技术中,判别光盘种类的装置及方法不外乎利用光盘反射率对特定光波长敏感的特性来判别光盘的种类,或者利用光盘的厚度来判别光盘的种类。然而,上述的方法多半会因为光盘反射率的差异性、马达驱动器或聚焦致动器制造的差异性而导致误判光盘种类的情况发生。Based on the above, in the prior art, the devices and methods for identifying the type of an optical disc are nothing more than using the characteristic that the reflectivity of the optical disc is sensitive to a specific light wavelength to identify the type of the optical disc, or using the thickness of the optical disc to identify the type of the optical disc. However, most of the above-mentioned methods may cause misjudgment of the type of the optical disc due to the discrepancy in reflectivity of the disc, and the manufacturing discrepancy in the motor driver or focus actuator.
因此,众多制造读取光盘的装置的厂商都在努力尝试克服上述问题。Therefore, many manufacturers of devices for reading optical discs are trying to overcome the above-mentioned problems.
发明内容 Contents of the invention
本发明提供一种判别光盘种类的装置及其方法,使得读取光盘的装置能够正确判别光盘的种类。The invention provides a device and a method for distinguishing the type of an optical disc, so that a device for reading the optical disc can correctly determine the type of the optical disc.
本发明提供了一种判别光盘种类的装置,此装置包括一光学读取单元和一控制单元。其中,光学读取单元,具有多个激光光源,用于发射多个激光之中的任意一个至光盘,并用于检测由光盘的数据层反射回的激光并将其转换为一检测信号。控制单元,耦接于光学读取单元,用于控制光学读取单元开启激光光源中的任意一个,还用于根据检测信号计算出聚焦误差信号,以此获得聚焦误差信号的S曲线的宽度值,控制单元重复上述的动作获得所有激光光源所产生的S曲线的宽度值后,还用于比较所有激光光源所产生的S曲线的宽度值,以此判断光盘的种类。The invention provides a device for distinguishing the type of optical disk, which includes an optical reading unit and a control unit. Wherein, the optical reading unit has multiple laser light sources for emitting any one of the multiple lasers to the optical disc, and for detecting the laser light reflected back by the data layer of the optical disc and converting it into a detection signal. The control unit, coupled to the optical reading unit, is used to control the optical reading unit to turn on any one of the laser light sources, and is also used to calculate the focus error signal according to the detection signal, so as to obtain the width value of the S-curve of the focus error signal After the control unit repeats the above actions to obtain the width values of the S-curves generated by all laser light sources, it is also used to compare the width values of the S-curves generated by all laser light sources to determine the type of the optical disc.
依照本发明的一个实施例,上述控制单元是根据宽度值为最小的聚焦误差信号的S曲线对应的激光光源的类型得到光盘的种类的。另外上述宽度值包括:一个S曲线的宽度值、多个S曲线的宽度值、半个S曲线的宽度值、四分之一个S曲线的宽度值、S曲线的正半轴的宽度值、S曲线的负半轴的宽度值、S曲线的波峰至波谷间的宽度值中的任意一个宽度值或上述宽度值的任意组合。According to an embodiment of the present invention, the control unit obtains the type of the optical disc according to the type of the laser light source corresponding to the S-curve of the focus error signal whose width value is the smallest. In addition, the above-mentioned width values include: the width value of one S curve, the width value of multiple S curves, the width value of half an S curve, the width value of a quarter of an S curve, the width value of the positive semi-axis of an S curve, Any one of the width values of the negative semi-axis of the S-curve, the width from the peak to the trough of the S-curve, or any combination of the above-mentioned width values.
依照本发明的一个实施例,上述控制单元还包括S曲线宽度值比较单元。此S曲线宽度值比较单元用于记录所有激光光源所产生的聚焦误差信号的S曲线宽度值并对其进行比较。According to an embodiment of the present invention, the control unit further includes an S-curve width comparison unit. The S-curve width value comparison unit is used to record and compare the S-curve width values of the focus error signals generated by all laser light sources.
本发明还提供了一种判别光盘种类的方法,适用于具有光学读取单元的装置中,此光学读取单元具有一物镜与多个激光光源,该方法包括以下步骤:(a)开启多个激光光源之中的一个,将激光发射至光盘;(b)移动物镜;(c)检测由光盘的数据层所反射的激光;(d)根据反射的激光计算出一聚焦误差信号,以此获得聚焦误差信号的S曲线的宽度值;(e)重复上述步骤,以获得所有激光光源所对应的S曲线的宽度值;(f)比较所有宽度值,以此判断出光盘的种类。The present invention also provides a method for discriminating the type of an optical disc, which is applicable to a device with an optical reading unit. The optical reading unit has an objective lens and multiple laser light sources. The method includes the following steps: (a) turning on multiple One of the laser light sources emits laser light to the optical disc; (b) moves the objective lens; (c) detects the laser light reflected by the data layer of the optical disc; (d) calculates a focus error signal according to the reflected laser light, thereby obtaining The width value of the S curve of the focus error signal; (e) repeat the above steps to obtain the width values of the S curves corresponding to all laser light sources; (f) compare all the width values to determine the type of the optical disc.
依照本发明的一个实施例,上述判断光盘的种类是根据宽度值为最小的S曲线相对应的激光光源的类型判断得出的。另外,上述宽度值包含一个S曲线的宽度值、多个S曲线的宽度值、半个S曲线的宽度值、四分之一个S曲线的宽度值、S曲线的正半轴的宽度值、S曲线的负半轴的宽度值、S曲线的波峰至波谷间的宽度值中的任意一个宽度值或上述宽度值的任意组合。According to an embodiment of the present invention, the above-mentioned determination of the type of the optical disc is determined according to the type of the laser light source corresponding to the S-curve whose width value is the smallest. In addition, the above-mentioned width value includes the width value of one S-curve, the width value of multiple S-curves, the width value of half an S-curve, the width value of a quarter of an S-curve, the width value of the positive semi-axis of an S-curve, Any one of the width values of the negative semi-axis of the S-curve, the width from the peak to the trough of the S-curve, or any combination of the above-mentioned width values.
综上所述,本发明所提供的判别光盘种类的装置及其方法因采用聚焦误差讯号的S曲线的宽度值来判别盘片的种类。所以,此装置与方法不像传统的判别光盘的种类的装置及其方法一样受到光盘反射率的差异性、马达驱动器制造的差异性与聚焦致动器制造的差异性的影响,而造成误判光盘种类的情况发生。所以,只要是基板厚度有差异的光盘,应用本发明都能准确地判别其种类。To sum up, the device and method for identifying the type of the optical disc provided by the present invention use the width value of the S-curve of the focus error signal to identify the type of the optical disc. Therefore, this device and method are not affected by disc reflectivity differences, motor driver manufacturing differences, and focusing actuator manufacturing differences like the traditional device and method for discriminating the type of optical disc, resulting in misjudgment Disc type situations occur. Therefore, as long as there are discs with different substrate thicknesses, the type can be accurately discriminated by applying the present invention.
附图说明 Description of drawings
图1为现有技术中一种判别光盘种类的装置;Fig. 1 is a kind of device for discriminating the type of disc in the prior art;
图2为现有技术中使用传统判别光盘种类的装置所生成的RFSUM信号的波形图;FIG. 2 is a waveform diagram of an RFSUM signal generated by a conventional disc type discriminator in the prior art;
图3为本发明中判别光盘种类的装置的一种实施例;Fig. 3 is an embodiment of the device for discriminating the type of disc in the present invention;
图4为图3所示判别光盘种类的装置的详细结构图;Fig. 4 is a detailed structural diagram of the device for discriminating the type of optical disc shown in Fig. 3;
图5为本发明实施例中应用图4所示装置所产生的聚焦误差信号的S曲线的示意图;FIG. 5 is a schematic diagram of an S-curve of a focus error signal generated by applying the device shown in FIG. 4 in an embodiment of the present invention;
图6为本发明中判别光盘种类的装置的另一实施例的详细结构图;Fig. 6 is a detailed structural diagram of another embodiment of the device for discriminating the type of optical disc in the present invention;
图7为本发明实施例中应用图6所示装置所产生的聚焦误差信号的S曲线的示意图;FIG. 7 is a schematic diagram of an S-curve of a focus error signal generated by applying the device shown in FIG. 6 in an embodiment of the present invention;
图8为本发明实施例中当光盘为双层碟时,应用图6所示装置所产生的聚焦误差信号的S曲线的示意图;FIG. 8 is a schematic diagram of an S-curve of a focus error signal generated by using the device shown in FIG. 6 when the optical disc is a double-layer disc in an embodiment of the present invention;
图9为本发明实施例中S曲线宽度值比较单元的结构图;9 is a structural diagram of an S-curve width value comparison unit in an embodiment of the present invention;
图10为本发明实施例中应用图4所示装置判别光盘种类的方法的流程图;FIG. 10 is a flowchart of a method for discriminating the type of an optical disc using the device shown in FIG. 4 in an embodiment of the present invention;
图11为本发明实施例中应用图6所示装置判别光盘种类的方法的流程图。FIG. 11 is a flowchart of a method for discriminating the type of an optical disc using the device shown in FIG. 6 in an embodiment of the present invention.
具体实施方式 Detailed ways
下面将结合附图及实施例对本发明的技术方案进行更详细的说明。The technical solution of the present invention will be described in more detail below with reference to the drawings and embodiments.
图3为本发明中判别光盘种类的装置的一种实施例。此装置包括光学读取单元20与控制单元21。其中,控制单元21耦接至光学读取单元20。光学读取单元20具有物镜以及多个激光光源,此多个激光光源可分别发射不同激光至光盘23。光学读取单元20会检测由光盘23所反射回的激光,然后将反射回的激光转换为检测信号det_sig并发送给控制单元21。控制单元21用于控制光学读取单元20开启任意一个激光光源,并移动光学读取单元20中的物镜。在物镜的移动过程中,控制单元21根据接收到的检测信号det_sig计算出聚焦误差信号,并以此获得聚焦误差信号的S曲线的宽度值;控制单元21重复上述的动作来获得所有的激光光源所产生的聚焦误差讯号的S曲线的宽度值。控制单元21比较所有的宽度值,以此来判断光盘23的种类。Fig. 3 is an embodiment of the device for discriminating the type of the optical disc in the present invention. The device includes an
下面将对上述判别光盘种类的方法做进一步地说明。当多个激光光源分别发射的激光聚焦在光盘23上时,会产生不同聚焦误差信号的S曲线。若此激光的种类不是与光盘23的种类相对应的正确的激光,则会因为球差现象而造成聚焦误差信号的S曲线宽度变宽。因此,比较不同的激光光源所产生的聚焦误差信号的S曲线的宽度值,就能判断出哪种激光光源所产生的球差现象最小,便能以此判别出此光盘的种类。因此,上述控制单元21判别光盘23的种类是依据与S曲线宽度值最小的聚焦误差信号相对应的激光光源来判别光盘23的种类。换言之,就是取产生S曲线宽度值最小的聚焦误差信号所对应的激光光源为判别此光盘23种类的激光光源。The above-mentioned method for discriminating the type of the optical disc will be further described below. When the laser light emitted by multiple laser light sources is focused on the
请参照图4,图4是图3的详细结构图。如图4所示,此判别光盘种类的装置还包括一马达驱动器22,用于提供聚焦驱动电压信号FCO。光学读取单元20包括CD激光光源200A、DVD激光光源200B、物镜202、分光器203、光检测器204与聚焦致动器201。其中,CD激光光源200A与DVD激光光源200B受控于控制单元21,用于分别发射CD激光与DVD激光。CD激光光源200A发射的激光为780纳米,而DVD激光光源200B发射的激光为650纳米。聚焦致动器201受控于马达驱动器22提供的聚焦驱动电压信号FCO,用于移动物镜202。激光光源200A或200B所发射的激光经过物镜202而聚焦在光盘23的数据层上,由数据层所反射的激光再经由物镜202和分光器203投射在光检测器204上。分光器203用于将激光光源200A或200B所发射的激光与由光盘23数据层所反射的激光分开。激光光源200A或200B所发射的激光经由分光器203的分光功能会被送至物镜202,而由光盘23的数据层所反射的激光经由物镜202和分光器203会被送至光检测器204。光检测器204用于接收由光盘23的数据层所反射的激光,并将该激光转换成检测信号det_sig。Please refer to FIG. 4 , which is a detailed structural diagram of FIG. 3 . As shown in FIG. 4 , the device for discriminating the type of an optical disc further includes a
控制单元21包括数字信号处理单元211、微处理器212与S曲线宽度值比较单元213。数字信号处理单元211根据检测信号det_sig计算出聚焦误差信号,以此获得此聚焦误差信号的S曲线。S曲线宽度值比较单元213耦接于数字信号处理单元211,用于记录S曲线的宽度值与比较所有激光光源所产生的聚焦误差信号的S曲线的宽度值,以此判别光盘23的种类。微处理器212耦接于S曲线宽度值比较单元213,用于控制物镜202的移动以及控制光学读取单元20开启CD激光光源200A与DVD激光光源200B。此微处理器212也控制S曲线宽度值比较单元213比较所储存的S曲线的宽度值。The
图5是图4实施例的聚焦误差信号的S曲线示意图。如图5所示,当DVD激光光源200B被开启后,马达驱动器22受到控制单元21的控制,聚焦驱动电压信号FCO的电压会以一固定斜率上升。此时,聚焦致动器201受到聚焦驱动电压信号FCO的控制会向上移动物镜202。在物镜202上升的过程中,DVD激光会聚焦在光盘23的数据层,进而产生聚焦误差信号的S曲线。S曲线宽度值比较单元213记录此光源所产生的S曲线的宽度值为S-cuv_DVD。之后,当CD激光光源200A被开启后,马达驱动器22受到控制单元21的控制,聚焦驱动电压信号FCO的电压会以一固定斜率下降。此时,聚焦致动器201受到聚焦驱动电压信号FCO的控制会向下移动物镜202。在物镜202下降的过程中,CD激光会聚焦在光盘23的数据层,进而产生另一聚焦误差信号的S曲线。S曲线宽度值比较单元213会记录此光源所产生的S曲线之宽度值为S-cuv_CD。此时,微处理器212会控制S曲线宽度值比较单元213比较CD激光光源200A与DVD激光光源200B所分别产生的S曲线的宽度值S-cuv_CD与S-cuv_DVD,并判断与宽度值最小的S曲线相对应的激光光源的种类为光盘23的种类。上述的CD激光光源200A与DVD激光光源200B的开启顺序仅是为方便说明本发明的实施方式,并非用于限定本发明。FIG. 5 is a schematic diagram of an S-curve of the focus error signal in the embodiment of FIG. 4 . As shown in FIG. 5 , when the DVD laser light source 200B is turned on, the
图4中的马达驱动器22可以移除,可直接使用控制单元21去控制聚焦致动器201。另外,移动物镜202的组件未必要使用聚焦致动器201,图4所示的判别光盘种类的装置仅是以此方式实施,非用于限定本发明,其它符合本发明精神的实施方式,当也在本发明的保护范围之内。且图5所示的S曲线的宽度值虽然仅包含一个S曲线的宽度,但上述宽度值更可以包含S曲线的一个、多数个、半个、四分之一个、正半轴、负半轴、波峰至波谷的宽度及其组合的其中之一的宽度。也就是说,上述宽度值可以是S曲线从产生到结束之间任意一段时间的宽度。The
如图6所示,在本发明的另一个实施例中,光学读取单元20还包括蓝光光盘(Blu-DVD)激光光源200C。此Blu-DVD激光光源200C也受控于控制单元21,并可发射波长为405纳米的Blu-DVD激光。请参照图7,图7是图6实施例的聚焦误差信号的S曲线示意图。如图7所示,当Blu-DVD激光光源200C被开启后,马达驱动器22受到控制单元21的控制,聚焦驱动电压信号FCO的电压会以一固定斜率上升。此时,聚焦致动器201受到聚焦驱动电压信号FCO的控制会向上移动物镜202。在物镜202上升的过程中,由Blu-DVD激光光源200C发出的Blu-DVD激光会经过物镜202而聚焦在光盘23的数据层,进而产生聚焦误差信号的S曲线。S曲线宽度值比较单元213会将该S曲线的宽度值记为S-cuv_Blu-DVD。然后,当DVD激光光源200B被开启后,马达驱动器22受到控制单元21的控制,聚焦驱动电压信号FCO的电压会以一固定斜率下降。此时,聚焦致动器201受到聚焦驱动电压信号FCO的控制会向下移动物镜202。在物镜202下降的过程中,由DVD激光光源200B发出的DVD激光会经过物镜202而聚焦在光盘23的数据层,进而产生聚焦误差信号的S曲线。S曲线宽度值比较单元213会将该S曲线的宽度值记为S-cuv_DVD。之后,CD激光光源200A被开启后,马达驱动器22受到控制单元21的控制,聚焦驱动电压信号FCO的电压会以一固定斜率上升。此时,聚焦致动器201受到聚焦驱动电压信号FCO的控制会向上移动物镜202。在物镜202上升的过程中,由CD激光光源200A发出的CD激光会经过物镜202而聚焦在光盘23的数据层上,进而产生聚焦误差信号的S曲线。S曲线宽度值比较单元213会将该S曲线的宽度值记为S-cuv_CD。此时,微处理器212会控制S曲线宽度值比较单元213比较由CD激光光源200A、DVD激光光源200B与Blu-DVD激光光源200C所分别产生的聚焦误差信号的S曲线的宽度值S-cuv_CD、S-cuv_DVD、S-cuv_Blu-DVD,以此来判别光盘的种类。如前所述,判别光盘23的种类是依据对应S曲线宽度值最小的激光光源。上述CD激光光源200A、DVD激光光源200B与Blu-DVD激光光源200C的开启顺序仅是用于方便说明本发明的实施方式,并非用于限定本发明。As shown in FIG. 6 , in another embodiment of the present invention, the
在本发明的另一个实施例中,光盘可以是多层光盘,例如,双层碟。在此实施例中,当上述多个激光分别聚焦在光盘的不同数据层时,会相应产生不同数据层的多个聚焦误差信号的S曲线,S曲线宽度值比较单元则会记录与比较在同一数据层产生的聚焦误差信号的S曲线的宽度值。请参照图8的实施例,图8是当光盘23为双层碟时,图6实施例的聚焦误差讯号的S曲线示意图。当DVD激光光源200B被开启后,马达驱动器22受到控制单元21的控制,聚焦驱动电压信号FCO的电压会以一固定斜率上升。此时,聚焦致动器201受到聚焦驱动电压信号FCO的控制会向上移动物镜202。在物镜202上升的过程中,DVD激光会先后聚焦在光盘23的第一数据层与第二数据层,进而产生两个聚焦误差信号的S曲线的宽度值S-cuv_DVD_0与S-cuv_DVD_1。S曲线宽度值比较单元213会记录这两个S曲线的宽度值。之后,当Blu-DVD激光光源200C被开启后,马达驱动器22受到控制单元21的控制,聚焦驱动电压信号FCO的电压会以一固定斜率下降。此时,聚焦致动器201受到聚焦驱动电压信号FCO的控制会向下移动物镜202。在物镜202下降的过程中,Blu-DVD激光会先后聚焦在光盘23的第一数据层与第二数据层,进而产生两个聚焦误差信号的S曲线的宽度值S-cuv_Blu-DVD_0与S-cuv_Blu-DVD_1。S曲线宽度值比较单元213会记录这两个S曲线的宽度值。此时,微处理器212会控制S曲线宽度值比较单元213比较Blu-DVD激光光源200C与DVD激光光源200B聚焦在光盘23的同一数据层(例如第一数据层或第二数据层)所分别产生的S曲线的宽度值S-cuv_Blu-DVD_0、S-cuv_DVD_0或S-cuv_Blu-DVD_1、S-cuv_DVD_1。也就是说,S曲线宽度值比较单元213会将S-cuv_DVD_0与S-cuv_Blu-DVD_0做比较,或者将S-cuv_DVD_1与S-cuv_Blu-DVD_1做比较,以此来判别光盘23的种类。如前所述,判别光盘23的种类是依据对应S曲线的宽度值最小的激光光源200B或200C的种类即为光盘23的种类。在此实施例中,仅以两个激光光源为例,当然也可包含其它的激光光源。且上述实施例仅是以双层碟的例子来解说,当光盘23为多于两层的多层光盘时,也可以根据不同激光光源对光盘23第i数据层所分别产生的S曲线的宽度值来判断光盘23的种类。In another embodiment of the present invention, the optical disc may be a multilayer optical disc, for example, a dual layer disc. In this embodiment, when the above-mentioned multiple lasers are respectively focused on different data layers of the optical disc, S-curves of multiple focus error signals of different data layers will be generated correspondingly, and the S-curve width value comparison unit will record and compare them in the same The width value of the S-curve of the focus error signal generated by the data layer. Please refer to the embodiment of FIG. 8 . FIG. 8 is a schematic diagram of the S-curve of the focus error signal of the embodiment of FIG. 6 when the
再来请参照图9,图9为S曲线宽度值比较单元213的电路图。此S曲线宽度值比较单元213包括S曲线宽度计算器ZZG0、内存ZZG1与决策比较元件ZZG2。S曲线宽度计算器ZZG0可根据诸如聚焦误差信号的S曲线从产生到结束过程中任意一段的宽度,例如,S曲线的正半轴、负半轴、波峰到波谷之间的宽度等,获得S曲线的宽度值。当然,熟知此领域者利用其它方式来计算S曲线宽度的方式,例如,测量S曲线中任意一段宽度的时间差,也不脱离本发明的精神与范围。内存ZZG1耦接于S曲线宽度计算器ZZG0,用于记录S曲线的宽度值。决策比较元件ZZG2耦接于内存ZZG1。当所有激光光源所产生的S曲线的宽度值均被记录后,决策比较元件ZZG2会比较所有的S曲线的宽度值,以此来判别光盘23的种类。上述S曲线宽度值比较单元213的实施方式,并非用于限定本发明,其它符合本发明精神的实施方式,当也在本发明之保护范围之内。Please refer to FIG. 9 again. FIG. 9 is a circuit diagram of the S-curve
上述分光器203可为一镀有多层膜的透明材质所形成的分光器,且上述光检测器204可为PIN的光接收器(PIN photodetector)或雪崩式的光接收器(avalanche photodector,APD)。另外,上述分光器203与光检测器204的实施方式,并非用于限定本发明,其它符合本发明精神的实施方式,当也在本发明之保护范围之内。The above-mentioned
再来请参照图10。图10是根据图4实施例所示的判别光盘种类的方法的流程图。如图10所示,此方法包括以下步骤:STEP_A,开启DVD激光光源,移动物镜并记录此激光光源所产生的S曲线的宽度值S-cuv_DVD;STEP_B,开启CD激光光源,移动物镜并记录此激光光源所产生的S曲线的宽度值S-cuv_CD;STEP_C,判断S-cuv_DVD是否小于S-cuv_CD,若是,则判别光盘的种类为DVD;否则,判别光盘的种类为CD。上述开启CD激光光源与DVD激光光源的顺序仅为其中一种实施例,并非用于限定本发明,其它符合本发明精神的实施方式,当也在本发明的保护范围之内。Please refer to Figure 10 again. FIG. 10 is a flow chart of the method for discriminating the type of an optical disc according to the embodiment shown in FIG. 4 . As shown in Figure 10, this method comprises the following steps: STEP_A, open DVD laser light source, move objective lens and record the width value S-cuv_DVD of the S curve that this laser light source produces; STEP_B, open CD laser light source, move objective lens and record this The width value S-cuv_CD of the S-curve generated by the laser light source; STEP_C, judge whether S-cuv_DVD is smaller than S-cuv_CD, if so, then judge the type of disc as DVD; otherwise, judge the type of disc as CD. The above sequence of turning on the CD laser light source and the DVD laser light source is only one example, and is not intended to limit the present invention. Other implementations that conform to the spirit of the present invention should also be within the protection scope of the present invention.
最后请参照图11,图11是根据图6实施例所示的判别光盘种类的方法的流程图。如图11所示,此方法包括以下步骤:STEP_D,开启Blu-DVD激光光源,移动物镜并记录此激光光源所产生的S曲线的宽度值S-cuv_blu-DVD;STEP_A,开启DVD激光光源,移动物镜并记录此激光光源所产生的S曲线的宽度值S-cuv_DVD;STEP_B,开启CD激光光源,移动物镜并记录此激光光源所产生的S曲线的宽度值S-cuv_CD;STEP_E,比较S-cuv_blu-DVD、S-cuv_DVD与S-cuv_CD的值,若S-cuv_blu-DVD最小,则判别此光盘的种类为Blu-DVD光盘;若S-cuv_DVD最小,则判别此光盘的种类为DVD;若S-cuv_CD最小,则判别光盘的种类为CD。上述开启CD激光光源、DVD激光光源与Blu-DVD激光光源的顺序仅为其中一种实施例,并非用于限定本发明,其它符合本发明精神的实施方式,当也在本发明的保护范围之内。Finally, please refer to FIG. 11 . FIG. 11 is a flow chart of the method for discriminating the type of an optical disc according to the embodiment shown in FIG. 6 . As shown in Figure 11, this method comprises the following steps: STEP_D, open Blu-DVD laser light source, move objective lens and record the width value S-cuv_blu-DVD of the S curve that this laser light source produces; STEP_A, open DVD laser light source, move Objective lens and record the width value S-cuv_DVD of the S-curve generated by the laser light source; STEP_B, turn on the CD laser light source, move the objective lens and record the width value S-cuv_CD of the S-curve generated by the laser light source; STEP_E, compare S-cuv_blu -DVD, S-cuv_DVD and S-cuv_CD values, if S-cuv_blu-DVD is the smallest, then determine the type of this disc is a Blu-DVD disc; if S-cuv_DVD is the smallest, then determine the type of this disc as DVD; if S If -cuv_CD is the smallest, the disc type is judged as CD. The above sequence of turning on the CD laser light source, DVD laser light source and Blu-DVD laser light source is only one example, and is not intended to limit the present invention. Other implementations that conform to the spirit of the present invention are also within the protection scope of the present invention. Inside.
当然,本发明还可有其它多种实施例,在不背离本发明精神及其实质的情况下,熟悉本领域的技术人员当可根据本发明作出各种相应的改变和变形,但这些相应的改变和变形都应属于本发明所附的权利要求的保护范围。Certainly, the present invention also can have other multiple embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding Changes and deformations should belong to the scope of protection of the appended claims of the present invention.
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CN200710136319A Expired - Fee Related CN100585711C (en) | 2007-07-13 | 2007-07-13 | Device and method for discriminating optical disk type |
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JP5358475B2 (en) * | 2010-02-15 | 2013-12-04 | 日立コンシューマエレクトロニクス株式会社 | Optical disc apparatus and focus control method |
CN102402995A (en) * | 2010-09-17 | 2012-04-04 | 凌阳科技股份有限公司 | Method and device for judging number of data layers of optical disk |
Citations (4)
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CN1195857A (en) * | 1996-10-24 | 1998-10-14 | 三星电子株式会社 | A method for identifying disc types and a digital versatile disc system using the method |
US6278672B1 (en) * | 1998-06-03 | 2001-08-21 | Sony Corporation | Optical disc discriminating device, optical disc reproducing device and discriminating method |
EP1195759A2 (en) * | 2000-10-05 | 2002-04-10 | Mitsubishi Denki Kabushiki Kaisha | Optical disc playback apparatus and method of judging disc type |
CN1534658A (en) * | 2002-12-18 | 2004-10-06 | ����-Lg���ݴ洢������˾ | Method and device for authenticating multilayer discs |
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Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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CN1195857A (en) * | 1996-10-24 | 1998-10-14 | 三星电子株式会社 | A method for identifying disc types and a digital versatile disc system using the method |
US6278672B1 (en) * | 1998-06-03 | 2001-08-21 | Sony Corporation | Optical disc discriminating device, optical disc reproducing device and discriminating method |
EP1195759A2 (en) * | 2000-10-05 | 2002-04-10 | Mitsubishi Denki Kabushiki Kaisha | Optical disc playback apparatus and method of judging disc type |
CN1534658A (en) * | 2002-12-18 | 2004-10-06 | ����-Lg���ݴ洢������˾ | Method and device for authenticating multilayer discs |
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