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CN100585711C - Device and method for discriminating optical disk type - Google Patents

Device and method for discriminating optical disk type Download PDF

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CN100585711C
CN100585711C CN200710136319A CN200710136319A CN100585711C CN 100585711 C CN100585711 C CN 100585711C CN 200710136319 A CN200710136319 A CN 200710136319A CN 200710136319 A CN200710136319 A CN 200710136319A CN 100585711 C CN100585711 C CN 100585711C
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laser light
curve
optical disc
width value
width
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CN101345063A (en
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冯文俊
叶建良
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Sunplus Technology Co Ltd
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Abstract

The invention provides a device for distinguishing the type of an optical disk. The device comprises an optical reading unit and a control unit. The optical reading unit is provided with a plurality of laser light sources, and the optical reading unit can emit any laser to the optical disk, detect the laser reflected by the optical disk and convert the laser into a detection signal. The control unit controls the optical reading unit to start any laser light source and moves an objective lens in the optical reading unit. When the objective lens moves, the control unit obtains the width value of an S curve of a focusing error signal according to the detection signal. The control unit repeats the above operations to obtain the width values of the S-curves generated by all the laser light sources, and compares all the width values to determine the type of the optical disc.

Description

判别光盘种类的装置及其方法 Device and method for discriminating disc type

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 optical reading unit 10 , a control unit 11 and a motor driver 12 . The control unit 11 is coupled to the optical reading unit 10 and the motor driver 12 , and the motor driver 12 is coupled to the optical reading unit 10 . The optical reading unit 10 has multiple laser light sources for emitting any laser light to the optical disc 13 , and converting the laser light reflected by the optical disc 13 into a detection signal det_sig. The control unit 11 is used to control the optical reading unit 10 to turn on any laser light source, and is also used to control the motor driver 12 to drive the objective lens 102 in the optical reading unit 10 to move. When the optical reading unit 10 is moving, the control unit 11 calculates the RFSUM signal according to the detection signal det_sig. Wherein, the peak A1 of the RFSUM signal is formed by the laser light reflected by the surface layer of the optical disc 13 , and the peak A2 is formed by the laser light reflected by the data layer of the optical disc 13 . The control unit 11 calculates the time difference T2-T1 (see FIG. 2 ) between the peaks A1 and A2, and calculates the thickness of the optical disc 13 according to the time difference T2-T1 to determine the type of the optical disc 13 .

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 . Optical reading unit 10 comprises: compact disc (CD) laser source 100A, digital video disc (DVD) laser source 100B, focus actuator (focus actuator) 101, objective lens 102, beam splitter (beam splitter) 103 and light detector 104 . The control unit 11 includes a digital signal processing unit 110 , a microprocessor 111 and a disc thickness calculation unit 112 . Wherein, the focus actuator 101 is coupled to the motor driver 12 . The CD laser light source 100A and the DVD laser light source 100B are controlled by the control unit 11. When the CD laser light source 100A (or DVD laser light source 100B) is turned on by the control unit 11, it emits CD laser light (or DVD laser light). The focus actuator 101 receives the focus driving voltage signal sent by the motor driver 12 to move the objective lens 102 at a constant speed. During the movement of the objective lens 102 , the CD laser (or DVD laser) emitted by the CD laser light source 100A (or DVD laser light source 100B ) will focus on the surface layer and the data layer of the optical disc 13 . The objective lens 102 is used to collect the laser light emitted by the CD laser light source 100A (or the DVD laser light source 100B) and the CD laser light (or DVD laser light) reflected by the optical disc 13 . The beam splitter 103 separates the CD laser light (or DVD laser light) emitted by the CD laser light source 100A (or DVD laser light source 100B) from the CD laser light (or DVD laser light) reflected by the optical disc 13, and separates the CD laser light (or DVD laser light) emitted by the CD laser light source 100A (or DVD laser light source 100A). The CD laser (or DVD laser) emitted by the light source 100B) is sent to the objective lens 102 , and the CD laser (or DVD laser) reflected by the optical disc 13 is sent to the photodetector 104 . The light detector 104 is used to detect the CD laser (or DVD laser) reflected by the optical disc 13 and convert it into a detection signal det_sig and send it to the digital processing signal unit 110 . The digital signal processing unit 110 calculates the RFSUM signal according to the detection signal det_sig. The optical disc thickness calculation unit 112 is used to calculate the time difference T2-T1 between the peaks A1 and A2 of the RFSUM signal, and calculate the thickness of the optical disc 13 according to the time difference T2-T1, so as to identify the type of the optical disc 13 . The microprocessor 111 is used to control the optical reading unit 10 to turn on the laser light source 100A or 100B.

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 optical disc 13 itself or the influence of the manufacturing variation of the focus actuator 101 and the motor driver 12, resulting in an error in the time difference T2-T1, so that the type of the optical disc 13 cannot be identified. In addition, since the reflectivity of the surface of the optical disc 13 is very low, the optical reading unit 10 may not find the position of the surface of the optical disc 13 .

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 optical reading unit 20 and a control unit 21 . Wherein, the control unit 21 is coupled to the optical reading unit 20 . The optical reading unit 20 has an objective lens and a plurality of laser light sources, and the plurality of laser light sources can respectively emit different lasers to the optical disc 23 . The optical reading unit 20 detects the laser light reflected by the optical disc 23 , and then converts the reflected laser light into a detection signal det_sig and sends it to the control unit 21 . The control unit 21 is used to control the optical reading unit 20 to turn on any laser light source, and move the objective lens in the optical reading unit 20 . During the moving process of the objective lens, the control unit 21 calculates the focus error signal according to the received detection signal det_sig, and thus obtains the width value of the S curve of the focus error signal; the control unit 21 repeats the above-mentioned actions to obtain all the laser light sources The width value of the S-curve of the generated focus error signal. The control unit 21 compares all the width values to determine the type of the optical disc 23 .

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 optical disc 23, S-curves of different focus error signals will be generated. If the type of the laser beam is not the correct laser beam corresponding to the type of the optical disc 23, the width of the S-curve of the focus error signal will be widened due to the phenomenon of spherical aberration. Therefore, by comparing the widths of the S-curves of focus error signals generated by different laser light sources, it can be determined which laser light source has the smallest spherical aberration phenomenon, and thus the type of the optical disc can be identified. Therefore, the control unit 21 determines the type of the optical disc 23 based on the laser light source corresponding to the focus error signal with the smallest S-curve width value to determine the type of the optical disc 23 . In other words, the laser light source corresponding to the focus error signal that produces the smallest S-curve width value is selected as the laser light source for discriminating the type of the optical disc 23 .

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 motor driver 22 for providing a focus driving voltage signal FCO. The optical reading unit 20 includes a CD laser light source 200A, a DVD laser light source 200B, an objective lens 202 , a beam splitter 203 , a light detector 204 and a focus actuator 201 . Wherein, the CD laser light source 200A and the DVD laser light source 200B are controlled by the control unit 21 for emitting CD laser light and DVD laser light respectively. The CD laser light source 200A emits laser light at 780 nm, while the DVD laser light source 200B emits laser light at 650 nm. The focus actuator 201 is controlled by the focus driving voltage signal FCO provided by the motor driver 22 for moving the objective lens 202 . The laser light emitted by the laser light source 200A or 200B is focused on the data layer of the optical disc 23 through the objective lens 202 , and the laser light reflected by the data layer is projected on the photodetector 204 through the objective lens 202 and the beam splitter 203 . The beam splitter 203 is used to separate the laser light emitted by the laser light source 200A or 200B from the laser light reflected by the data layer of the optical disc 23 . The laser light emitted by the laser light source 200A or 200B will be sent to the objective lens 202 through the spectroscopic function of the beam splitter 203 , and the laser light reflected by the data layer of the optical disc 23 will be sent to the photodetector 204 through the objective lens 202 and the beam splitter 203 . The light detector 204 is used to receive the laser light reflected by the data layer of the optical disc 23 and convert the laser light into a detection signal det_sig.

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 control unit 21 includes a digital signal processing unit 211 , a microprocessor 212 and an S-curve width comparison unit 213 . The digital signal processing unit 211 calculates the focus error signal according to the detection signal det_sig, so as to obtain the S-curve of the focus error signal. The S-curve width comparison unit 213 is coupled to the digital signal processing unit 211 for recording the width of the S-curve and comparing the width of the S-curve with focus error signals generated by all laser light sources, so as to identify the type of the optical disc 23 . The microprocessor 212 is coupled to the S-curve width comparison unit 213 for controlling the movement of the objective lens 202 and controlling the optical reading unit 20 to turn on the CD laser light source 200A and the DVD laser light source 200B. The microprocessor 212 also controls the S-curve width comparison unit 213 to compare the stored S-curve width values.

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 motor driver 22 is controlled by the control unit 21 , and the voltage of the focus driving voltage signal FCO rises with a fixed slope. At this time, the focus actuator 201 is controlled by the focus driving voltage signal FCO to move the objective lens 202 upward. During the rising process of the objective lens 202, the DVD laser will focus on the data layer of the optical disc 23, thereby generating an S-curve of the focus error signal. The S-curve width comparison unit 213 records the width of the S-curve generated by the light source as S-cuv_DVD. Afterwards, when the CD laser light source 200A is turned on, the motor driver 22 is controlled by the control unit 21, and the voltage of the focus driving voltage signal FCO will decrease with a fixed slope. At this moment, the focus actuator 201 is controlled by the focus driving voltage signal FCO to move the objective lens 202 downward. When the objective lens 202 descends, the CD laser light will focus on the data layer of the optical disc 23, thereby generating another S-curve of the focus error signal. The S-curve width comparison unit 213 records the width of the S-curve generated by the light source as S-cuv_CD. At this time, the microprocessor 212 will control the S-curve width comparison unit 213 to compare the width values S-cuv_CD and S-cuv_DVD of the S-curves generated by the CD laser light source 200A and the DVD laser light source 200B respectively, and determine the one with the smallest width value. The type of laser light source corresponding to the S curve is the type of the optical disc 23 . The above-mentioned turn-on sequence of the CD laser light source 200A and the DVD laser light source 200B is only for convenience of describing the embodiment of the present invention, and is not used to limit the present invention.

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 motor driver 22 in FIG. 4 can be removed, and the control unit 21 can be directly used to control the focus actuator 201 . In addition, it is not necessary to use the focus actuator 201 to move the components of the objective lens 202. The device for discriminating the disc type shown in FIG. Also within the protection scope of the present invention. And although the width value of the S-curve shown in Figure 5 only includes the width of one S-curve, the above-mentioned width value can further include one, several, half, one-fourth, positive semi-axis, and negative half-axis of the S-curve. The width of one of axis, peak-to-trough width, and combinations thereof. That is to say, the above-mentioned width value may be the width of any period of time between the generation and the end of the S-curve.

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 optical reading unit 20 further includes a Blu-ray Disc (Blu-DVD) laser light source 200C. The Blu-DVD laser light source 200C is also controlled by the control unit 21 and can emit Blu-DVD laser with a wavelength of 405 nm. Please refer to FIG. 7 . FIG. 7 is a schematic diagram of an S-curve of the focus error signal in the embodiment of FIG. 6 . As shown in FIG. 7 , when the Blu-DVD laser light source 200C is turned on, the motor driver 22 is controlled by the control unit 21 , and the voltage of the focus driving voltage signal FCO rises with a fixed slope. At this time, the focus actuator 201 is controlled by the focus driving voltage signal FCO to move the objective lens 202 upward. When the objective lens 202 rises, the Blu-DVD laser emitted by the Blu-DVD laser light source 200C will pass through the objective lens 202 and be focused on the data layer of the optical disc 23, thereby generating an S-curve of the focus error signal. The S-curve width comparison unit 213 will record the S-curve width as S-cuv_Blu-DVD. Then, when the DVD laser light source 200B is turned on, the motor driver 22 is controlled by the control unit 21, and the voltage of the focus driving voltage signal FCO will decrease with a fixed slope. At this moment, the focus actuator 201 is controlled by the focus driving voltage signal FCO to move the objective lens 202 downward. When the objective lens 202 descends, the DVD laser emitted by the DVD laser light source 200B will pass through the objective lens 202 and be focused on the data layer of the optical disc 23, thereby generating an S-curve of the focus error signal. The S-curve width comparison unit 213 will record the S-curve width as S-cuv_DVD. Afterwards, after the CD laser light source 200A is turned on, the motor driver 22 is controlled by the control unit 21, and the voltage of the focus driving voltage signal FCO rises with a fixed slope. At this time, the focus actuator 201 is controlled by the focus driving voltage signal FCO to move the objective lens 202 upward. When the objective lens 202 rises, the CD laser emitted by the CD laser light source 200A will pass through the objective lens 202 and be focused on the data layer of the optical disc 23, thereby generating an S-curve of the focus error signal. The S-curve width comparison unit 213 will record the width of the S-curve as S-cuv_CD. At this time, the microprocessor 212 controls the S-curve width comparison unit 213 to compare the S-curve width values S-cuv_CD of the focus error signals generated by the CD laser light source 200A, the DVD laser light source 200B, and the Blu-DVD laser light source 200C respectively. , S-cuv_DVD, S-cuv_Blu-DVD to identify the type of disc. As mentioned above, the type of the optical disc 23 is determined based on the laser light source corresponding to the smallest width value of the S-curve. The turn-on sequence of the CD laser light source 200A, the DVD laser light source 200B, and the Blu-DVD laser light source 200C is only for convenience of describing the embodiment of the present invention, and is not intended to limit the present invention.

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 optical disc 23 is a dual-layer disc. When the DVD laser light source 200B is turned on, the motor driver 22 is controlled by the control unit 21, and the voltage of the focus driving voltage signal FCO rises with a fixed slope. At this time, the focus actuator 201 is controlled by the focus driving voltage signal FCO to move the objective lens 202 upward. During the rising process of the objective lens 202 , the DVD laser will focus on the first data layer and the second data layer of the optical disc 23 successively, thereby generating two S-curve width values S-cuv_DVD_0 and S-cuv_DVD_1 of the focus error signal. The S-curve width comparison unit 213 will record the width values of the two S-curves. Afterwards, when the Blu-DVD laser light source 200C is turned on, the motor driver 22 is controlled by the control unit 21, and the voltage of the focus driving voltage signal FCO will decrease with a fixed slope. At this moment, the focus actuator 201 is controlled by the focus driving voltage signal FCO to move the objective lens 202 downward. During the descending process of the objective lens 202, the Blu-DVD laser will focus on the first data layer and the second data layer of the optical disc 23 successively, thereby generating two S-curve width values S-cuv_Blu-DVD_0 and S-cuv_Blu-DVD_0 and S- cuv_Blu-DVD_1. The S-curve width comparison unit 213 will record the width values of the two S-curves. At this time, the microprocessor 212 controls the S-curve width comparison unit 213 to compare the differences between the Blu-DVD laser light source 200C and the DVD laser light source 200B focused on the same data layer (such as the first data layer or the second data layer) of the optical disc 23, respectively. The width value of the generated S-curve is S-cuv_Blu-DVD_0, S-cuv_DVD_0 or S-cuv_Blu-DVD_1, S-cuv_DVD_1. That is to say, the S-curve width comparison unit 213 compares S-cuv_DVD_0 with S-cuv_Blu-DVD_0 , or compares S-cuv_DVD_1 with S-cuv_Blu-DVD_1 to determine the type of the optical disc 23 . As mentioned above, the type of the optical disc 23 is determined according to the type of the laser light source 200B or 200C corresponding to the smallest width value of the S-curve, that is, the type of the optical disc 23 . In this embodiment, only two laser light sources are taken as an example, and of course other laser light sources may also be included. And the above-mentioned embodiment is only explained with the example of double-layer disc, when optical disc 23 is more than two layers of multi-layer optical disc, also can be according to the width of the S curve that different laser light sources respectively produce to the i-th data layer of optical disc 23 value to determine the type of the optical disc 23.

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 width comparison unit 213 . The S-curve width comparison unit 213 includes an S-curve width calculator ZZG0 , a memory ZZG1 and a decision comparison element ZZG2 . The S-curve width calculator ZZG0 can obtain S according to the width of any segment of the S-curve from the generation to the end of the focus error signal, for example, the positive semi-axis, negative semi-axis, peak to trough width of the S-curve, etc. The width value of the curve. Certainly, those skilled in the art may use other methods to calculate the width of the S-curve, for example, measuring the time difference of any width in the S-curve, without departing from the spirit and scope of the present invention. The memory ZZG1 is coupled to the S-curve width calculator ZZG0 for recording the width of the S-curve. The decision comparison element ZZG2 is coupled to the memory ZZG1. After the width values of the S-curves generated by all the laser light sources are recorded, the decision comparison component ZZG2 compares the width values of all the S-curves to determine the type of the optical disc 23 . The implementation of the above-mentioned S-curve width comparison unit 213 is not intended to limit the present invention, and other implementations conforming to the spirit of the present invention should also be within the protection scope of the present invention.

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 beam splitter 203 can be a beam splitter formed by a transparent material coated with a multi-layer film, and the above-mentioned photodetector 204 can be a PIN photodetector (PIN photodetector) or an avalanche photodetector (avalanche photodetector, APD ). In addition, the above implementations of the beam splitter 203 and the light detector 204 are not intended to limit the present invention, and other implementations conforming to the spirit of the present invention should also be within the protection scope of the present invention.

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.

Claims (16)

1、一种判别光盘种类的装置,包括一光学读取单元和一控制单元,其特征在于,1. A device for discriminating the type of optical disc, comprising an optical reading unit and a control unit, characterized in that, 所述光学读取单元,具有多个激光光源,用于发射多个激光之中的任意一个至所述光盘,并用于检测由所述光盘的数据层反射回的激光并将其转换为一检测信号;The optical reading unit has a plurality of laser light sources for emitting any one of a plurality of laser light to the optical disc, and for detecting the laser light reflected back from the data layer of the optical disc and converting it into a detected Signal; 所述控制单元,耦接于所述光学读取单元,用于控制所述光学读取单元开启所述多个激光光源中的任意一个,还用于根据所述检测信号计算出聚焦误差信号,以此获得所述聚焦误差信号的S曲线的宽度值,所述控制单元重复上述的动作获得所述多个激光光源所产生的S曲线的宽度值后,还用于比较所述多个激光光源所产生的S曲线的宽度值,以此判断所述光盘的种类。The control unit, coupled to the optical reading unit, is used to control the optical reading unit to turn on any one of the plurality of laser light sources, and is also used to calculate a focus error signal according to the detection signal, In this way, the width value of the S-curve of the focus error signal is obtained. After the control unit repeats the above-mentioned actions to obtain the width value of the S-curve generated by the multiple laser light sources, it is also used to compare the multiple laser light sources. The width value of the generated S-curve is used to determine the type of the optical disc. 2、如权利要求1所述的装置,其特征在于,所述控制单元是根据宽度值为最小的S曲线对应的激光光源的类型得到所述光盘的种类的。2. The device according to claim 1, wherein the control unit obtains the type of the optical disc according to the type of the laser light source corresponding to the S-curve whose width value is the smallest. 3、如权利要求1所述的装置,其特征在于,所述控制单元获得的所述S曲线的宽度值包括: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、一个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。3. The device according to claim 1, wherein the width value of the S-curve obtained by the control unit includes: the width value of one S-curve, the width value of multiple S-curves, the width value of half an S-curve Width value, width value of a quarter of the S-curve, width value of the positive semi-axis of the S-curve, width value of the negative semi-axis of the S-curve, and any one of the width values between the peak and the trough of an S-curve value or any combination of the above width values. 4、如权利要求1所述的装置,其特征在于,所述控制单元包括数字信号处理单元、微处理器和S曲线宽度值比较单元;4. The device according to claim 1, wherein the control unit comprises a digital signal processing unit, a microprocessor and an S-curve width value comparison unit; 所述数字信号处理单元用于根据所述检测信号计算出所述聚焦误差信号,以此获得所述聚焦误差信号的S曲线;The digital signal processing unit is used to calculate the focus error signal according to the detection signal, so as to obtain the S-curve of the focus error signal; 所述S曲线宽度值比较单元用于记录所述多个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;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 the multiple laser light sources; 所述微处理器耦接于所述S曲线宽度值比较单元,用于控制所述光学读取单元开启所述多个激光光源中的任意一个,还用于控制所述S曲线宽度值比较单元比较其储存的所有S曲线的宽度值。The microprocessor is coupled to the S-curve width value comparison unit, and is used to control the optical reading unit to turn on any one of the plurality of laser light sources, and is also used to control the S-curve width value comparison unit Compares the width values of all the S-curves it stores. 5、如权利要求4所述的装置,其特征在于,所述S曲线宽度值比较单元包括:S曲线宽度值计算器、内存和决策比较元件;5. The device according to claim 4, wherein the S-curve width value comparison unit comprises: an S-curve width value calculator, a memory and a decision comparison element; 所述S曲线宽度值计算器用于接收所述所有S曲线并计算其宽度值;The S-curve width value calculator is used to receive all the S-curves and calculate their width values; 所述内存耦接于所述S曲线宽度值计算器,用于记录所述所有S曲线的宽度值;The memory is coupled to the S-curve width value calculator for recording the width values of all the S-curves; 所述决策比较元件耦接于所述内存,当所述多个激光光源所产生的聚焦误差信号的S曲线的宽度值均被记录时,所述决策比较元件用于比较所述所有S曲线的宽度值。The decision comparison element is coupled to the memory, and when the width values of the S-curves of the focus error signals generated by the multiple laser light sources are all recorded, the decision comparison element is used to compare the widths of all the S-curves. width value. 6、如权利要求4所述的装置,其特征在于,所述光学读取单元还包括:分光器、物镜、光检测器和聚焦致动器;6. The device according to claim 4, wherein the optical reading unit further comprises: a beam splitter, an objective lens, a light detector, and a focus actuator; 所述分光器,用于将所述激光光源发来的激光投射至所述物镜,还用于将所述物镜向所述分光器投射的所述光盘反射回的激光投射至所述光检测器;The beam splitter is used to project the laser light from the laser light source to the objective lens, and is also used to project the laser light reflected from the optical disc projected by the objective lens to the beam splitter to the photodetector ; 所述物镜用于接收所述分光器向所述物镜发送的所述激光光源发来的激光,并将所述激光投射至所述光盘,使所述激光聚焦于所述光盘的数据层,还用于将所述光盘反射回的激光投射至所述分光器;The objective lens is used to receive the laser light from the laser light source sent by the beam splitter to the objective lens, project the laser light onto the optical disc, focus the laser light on the data layer of the optical disc, and projecting laser light for reflecting back from the optical disc to the beam splitter; 所述光检测器,耦接于所述控制单元中的数字信号处理单元,用于检测由所述光盘所反射回的激光,并将所述激光转换成对应的检测信号后发送给所述数字信号处理单元;The photodetector, coupled to the digital signal processing unit in the control unit, is used to detect the laser light reflected by the optical disc, and convert the laser light into a corresponding detection signal and send it to the digital signal processing unit. signal processing unit; 所述聚焦致动器,用于在所述微处理器的控制下移动所述物镜。The focusing actuator is used to move the objective lens under the control of the microprocessor. 7、如权利要求6所述的装置,其特征在于,所述装置还包括马达驱动器,所述马达驱动器耦接于所述聚焦制动器与所述微处理器,所述马达驱动器受控于所述微处理器,用于驱动所述聚焦致动器,使所述聚焦致动器得以移动所述物镜。7. The device according to claim 6, further comprising a motor driver, the motor driver is coupled to the focus actuator and the microprocessor, and the motor driver is controlled by the a microprocessor for driving the focus actuator to enable the focus actuator to move the objective lens. 8、如权利要求1所述的装置,其特征在于,所述多个激光光源包括光盘CD激光光源、数字影音光盘DVD激光光源和蓝光光盘Blu-DVD激光光源的任意组合。8. The device according to claim 1, wherein the plurality of laser light sources include any combination of CD laser light sources, digital audio-visual disc DVD laser light sources and Blu-ray Disc Blu-DVD laser light sources. 9、如权利要求1所述的装置,其特征在于,当所述光盘为多层光盘时,所述控制单元用于记录所述多个激光光源在所述光盘至少一数据层所产生的反射光所形成的聚焦误差信号的S曲线的宽度值,并比较同一数据层所对应的多个S曲线的宽度值,根据宽度值为最小的S曲线相对应的激光光源的类型得到所述光盘的种类。9. The device according to claim 1, wherein when the optical disc is a multi-layer optical disc, the control unit is configured to record reflections generated by the plurality of laser light sources on at least one data layer of the optical disc The width value of the S-curve of the focus error signal formed by light, and compare the width values of multiple S-curves corresponding to the same data layer, and obtain the optical disc according to the type of laser light source corresponding to the S-curve with the smallest width value type. 10、如权利要求9所述的装置,其特征在于,所述多层光盘包括多层的数字影音光盘或多层的蓝光光盘。10. The apparatus of claim 9, wherein the multi-layer disc comprises a multi-layer Digital Video Disc or a multi-layer Blu-ray Disc. 11、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,所述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:11. A method for discriminating the type of an optical disc, suitable for use in a device with an optical reading unit, the optical reading unit having an objective lens and multiple laser light sources, the method comprising the following steps: 开启所述多个激光光源之中的一个,将激光发射至所述光盘;Turn on one of the plurality of laser light sources to emit laser light to the optical disc; 移动物镜;moving objective lens; 检测由所述光盘的数据层所反射的激光;detecting laser light reflected by the data layer of the optical disc; 根据所述反射的激光计算出一聚焦误差信号,以此获得所述聚焦误差信号的S曲线的宽度值;calculating a focus error signal according to the reflected laser light, so as to obtain the width value of the S-curve of the focus error signal; 重复上述步骤,以获得所述多个激光光源所对应的S曲线的宽度值;以及Repeating the above steps to obtain the width value of the S-curve corresponding to the plurality of laser light sources; and 比较所有所述宽度值,以此判断出所述光盘的种类。All the width values are compared to determine the type of the optical disc. 12、如权利要求11所述的方法,其特征在于,所述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。12. The method according to claim 11, wherein 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. 13、如权利要求11所述的方法,其特征在于,所述S曲线的宽度值包含所述一个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、正半轴的S曲线的宽度值、负半轴的S曲线的宽度值、一个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。13. The method according to claim 11, wherein the width value of the S-curve includes the width value of the one S-curve, the width value of multiple S-curves, the width value of half an S-curve, the width value of a quarter One of the width values of the S-curve, the width of the S-curve on the positive semi-axis, the width of the S-curve on the negative semi-axis, any one of the width values from the peak to the trough of an S-curve, or the above-mentioned width values any combination of . 14、如权利要求11所述的方法,其特征在于,所述多个激光光源包括:光盘CD激光光源、数字影音光盘DVD激光光源和蓝光光盘Blu-DVD激光光源的任意组合。14. The method according to claim 11, wherein the plurality of laser light sources include any combination of CD laser light sources, digital audio-visual disc DVD laser light sources and Blu-ray Disc Blu-DVD laser light sources. 15、如权利要求12所述的方法,其特征在于,当所述光盘为多层光盘时,在检测由所述光盘的数据层所反射的激光时,是检测由所述光盘的至少一数据层所反射的激光;在比较所有所述宽度值以此判断出所述光盘的种类时,是比较所述激光在所述光盘的同一数据层所产生的多个聚焦误差信号的S曲线的宽度值,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出所述光盘的种类。15. The method according to claim 12, wherein when the optical disc is a multi-layer optical disc, when detecting the laser light reflected by the data layer of the optical disc, at least one data layer of the optical disc is detected. The laser reflected by the layer; when comparing all the width values to determine the type of the optical disc, it is to compare the width of the S-curve of the multiple focus error signals generated by the laser on the same data layer of the optical disc 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. 16、如权利要求15所述的方法,其特征在于,所述多层光盘包括多层的数字影音光盘或多层的蓝光光盘。16. The method of claim 15, wherein the multi-layer disc comprises a multi-layer Digital Video Disc or a multi-layer Blu-ray Disc.
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