TWI298487B - Optical medium identification method and apparatus thereof - Google Patents

Description

1298487 __m 91115277 W year η month ^ Τ π V. Description of the invention (1) [Technical field of invention] 装置 A device and method for recognizing an optical medium, and particularly related to an optical=media identification method and apparatus, Used in devices that can reproduce two or disc materials to identify the type of optical media. [Prior Art] 'Hot:> Explain that 'a system that can reproduce two or more types of optical disc data, and a digital multiplex disc (DVD) reproduction system. In dvd reproduction, you can reproduce data placed on a single-layer DVD, two-layer DVD or digital disc, and '(Compact Disc, CD). In the reproducing system, the wavelength of the light source for reading and writing CD is 780 nm, and the wavelength of the read/write DVD light source is 635_65 〇 nin. Because of this difference, the system must have separate reading and writing elements for laser diodes for CDs and laser diodes for DVDs. However, when the search focus mode is executed in order to recognize the Japanese temple placed in the reproduction disc type, only the laser diode for the dvd in the DVD reproduction system is used. >, mainly because the source wavelength and focal length ratio of the DVD are shorter than the wavelength of the light source used by the CD and the focal length, making it easier to identify the optical medium. However, due to the different types of read/write units in the DVD reproduction system or the large changes in the modulation of the disc, the radio frequency (Radi〇Frequency, RF) adds a large amount of signals, and as a result, the problem of discriminating the disc often occurs. For example, If the slope of the measured rf summed signal is usually placed when the disc is placed on a CD, the slope of the disc is a single layer DVD. However, for the above reasons, the read/write unit f is different or disc modulation The change makes the slope of the measured RF total signal steeper than the actual value. Although the disc type is a CD disc, it is also mistaken for a single-layer DVD disc. Furthermore, if the above reasons make the first 9 pages 9696pi fl.ptc 1 toilet 7 case number fll_7 V. Invention description (2) 曰一修正Yue month disc measured RF total signal slope is more than the actual value of RF plus total signal peak number is 2, continue to release Thousands: and the same side can misrecognize the disc as a double-layer DVD. The film is a CD', but at the same time, when the placed disc is double-layered, the RF signal is changed, which may be wrong:= The disc placed on the ground is a single-layer DVD, because it is a C disc' or The number is changed, (4) misrepresentation of the disc is set to =, so that the RF is summed up [invention] [Way sheet]. Therefore, the object of the present invention is to provide a disc arrangement for solving the above problems, using the method and device (10) The laser diode used and the laser diode used in the second (2) body media are used to reproduce two types of discs or discs that are identified in the #_3^关生生系统. The purpose of the present invention is to provide a method for disc reproduction system of disc data, and for recognizing two or more types of reproduction: the method includes opening and setting in the disc reproduction system = 2 = using the same For the peak; then use the peak of the focus error signal: ;: = letter = peak to identify in the disc regeneration system; if the device is turned on the second learning medium of the disc reproduction system, then

Body, perform the search focus mode; then check the number of peaks in the summation signal of the search laser, and identify the RF class obtained by the type = if the peak is the peak value to identify the disc Peak to peak value ^ When the preset reference value is large, page 10 9696pi f1.ptc

1298487 Wire 9ms? 77 V. Invention Description (3) For optical media, when the peak of the focus error signal is peaked, the disc is confirmed to be the second optical medium. The type of 乂 Λ 据 据 据 据 据 据 据 据 据 据 据 据 据 据 据 据 据 据 据 据 据 据 据 据 据 据 据 据 据 据 据 据 据 据 据 据 据 据 据 据 据 据 据 据 据 据 据Or regeneration system. μ Included - read and write single 兀忒 写 兀 兀 兀 兀 兀 兀 兀 第 第 第 第 第 第 雷 雷 雷 雷 雷 雷 雷 雷 雷 雷 雷 雷 雷 雷 雷 雷 雷 雷 雷 雷 雷 雷 雷 雷 雷 雷 雷 雷The polar body, and the basis = to generate a focus error signal, which is the sum of the total signal ί ΐΐ: error signal processor; a servo unit that detects the size of the focus error signal generated by the signal of the Xinjiang and the servo;控制 控制 控制 该 RF RF RF RF RF RF RF RF RF RF 控制 控制 控制 控制 控制 控制 控制 控制 控制 控制 控制 控制 控制 控制 控制 控制 控制 控制 控制 控制 控制 控制 控制 控制 控制 控制 控制 控制 控制 控制 控制 控制 控制 控制 控制 控制 控制 控制 控制With the servo error signal processor, ί 0』 is added to the total number of signals, in order to recognize the disc

The pre-set time of the element is to supply the focus drive voltage to the read/write list for one of the rise or fall periods of the AK focus type. ^±^1^ The purpose, characteristics, and advantages can be more obvious. 911ΊΒ977 leap years? _J 曰 、 、 发明 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 较佳 较佳 较佳 较佳 较佳 较佳 较佳 较佳 较佳 较佳 较佳 较佳 较佳 较佳 较佳 较佳 较佳 较佳 较佳The device comprises a disc 101' a read/write unit 110, an RF signal and a servo error signal processor 1 2 0 'a servo unit 丨3 〇, and a system control unit 丨4 〇. The read/write unit 110 includes an objective lens 111, a beam splitter 112, a laser diode (LD) 113 for cd (CD optical media), an LD 114 for DVD (DVD optical media), and a focus actuator 11 5 . And a light source detector 丨丨6.

After the user issues the identification media command, the system control unit 114 transmits a signal to the RF signal and the servo error signal processor 丨2〇 to turn on the power of the LD 113 for the CD, and the servo unit 130 is required to perform the search focus mode. For disc recognition. Then, the RF signal and the servo error signal processor 〇2〇 are powered by an automatic laser power control (ALPC) (not shown) to drive the LD 113 for (3). The ALPC automatically controls the power of the LD113 for the CD. As shown by the device shown in Figure 1, an ALPC is provided within the RF signal and servo error signal processing state 120. The ALPC can also be placed outside of the rf signal and the servo error signal processor 120. The servo unit 130 provides a driving voltage (focus drive, F〇cus Drive F〇D) to the focus actuator 115, and moves the focus actuator 115 up or down, so that the read/write unit 110 can be on the disc. Finding the interpupillary distance in 1 。 1. The focus actuator 115 is moved up or down so that the objective lens is lowered together to perform the search for the focus mode. The search focus mode & 夂 causes the signal of the surface of the disc 101 to enter the focus. 1298487 Case No. 91115277 Month 5, Invention Description (5) When the LD 1 1 3 for driving the CD performs the search focus mode, the light source detector 11 6 detects the reflected light beam transmitted through the splitter 1 12 and then sends out the light beam. Up to the RF signal and the servo error processor 12. According to the amount of light source detected by the light source detector 116, the rf signal and the servo error processor 120 generate a focus error signal ({? E) and A π plus total signal. According to the measured beam quantity, a conventional method is used to generate a focus error signal and an RF total signal. If the disc currently placed is a CD, the search focus mode drives the focus actuator 115. During the rise of FOD, Figure 2A shows the generated π signal and the RF summed signal. If the disc currently placed is a single-layer DVD, the search for the focus mode is driven by the focus actuator 11 5 during the rise of f〇d, as shown in Figure 2B. The FE signal and the RF total signal. If the disc currently placed is a double-layer DVD, the drive focus actuator 115 searching for the focus mode displays the FE signal and the RF total signal generated by referring to FIG. 2C during the FOD rise period. The output number is sent to the feeding unit 13(), and the RF summing signal is sent to the control unit 140. The servo unit 丨3〇 detects the amplitude of the ρΕ signal. The maximum and minimum peak values of the FE signal are measured and then sent to the system control unit 丨4. The system control unit 14 compares the size of the FE signal sent by the servo unit 。3〇. (6) The result is displayed as a signal comparison _ The value (ΤΗ) is large, confirming that the disc currently placed is a CD, and outputting a type signal, so that the DVD reproduction system can automatically execute (3) the reproduction mode. However, if the FE signal is not larger than the preset reference value (TH), the slice type disc Film. At this time, System controlling two. The total signal is not. If it is confirmed Singles U now propose placed, the system

9696pifl.ptc Page 13 Amendment 1298487 Case No. 91115277 V. Description of the Invention (6) The control unit 1 40 outputs a signal to the RF signal and the servo error signal processor 120 to turn on the LD 114 for the DVD, requesting the servo unit 130 to re-enter Perform search focus mode. Then, the RF signal and servo error signal processor 120 turn on the LD 114 for DVD through ALPC (not shown). The ALPC device automatically controls the LD 114 for the DVD in the RF signal and servo error signal processor 120.

Power. At the same time, the LD 11 3 for the CD stops emitting the light beam, and then the LD 114 emission beam for the DVD passes through the beam splitter 112 to the objective lens 111. The focus actuator 11 is driven by the servo unit 130 to move the objective lens 11 up and down. The search focus mode is thus performed. Then, the light source detector 11 6 detects the amount of the reflected beam transmitted through the beam splitter 11 and then sends the measured beam to the RF signal in the same manner as the servo error processor. The RF signal is the same as the LD 113 for processing the CD. And the servo error processor 120 generates an FE signal and an RF summed signal, sends an RF summed signal to the system control unit 丨40, and sends the FE signal to the SERVOPACK.

忒 Servo unit 1 30 detects the peak value of the FE signal, and then outputs the value to the = control: element ". But 'At this time, the system control unit 140 does not make the peak of the fe signal sent by the servo unit 130, but Check the number of peaks of the RF summed signal during the up-down period. If the summation letter: 2, the number of the discs is 5, the disc is a single layer _, and the regeneration mode of the system is reproduced.杈 唬 唬 唬 唬 唬 唬 唬 唬 唬 唬 唬 唬 唬 唬 唬 唬 唬 唬 唬 唬 唬 唬 唬 唬 唬 唬 唬 唬 唬 唬 唬 自动 自动 自动 自动 自动 自动 自动 自动 自动 自动 自动 自动 自动 自动

9696pi f1. Page 14 Convenient for automatic execution of the dual layer DVD playback mode. Two-out regeneration 杈 1298487 Case No. 91115277 V. Invention description (7) k-like, if the disc to be placed is a single layer, refer to Figure 38 for the FE signal and rf total error signal generated when the falling interval is displayed. At the same time, the disc placed at ° is a double-layer DVD, and the total error signal of F E # and r f generated when the FOD is lowered is shown in Fig. 3B. The fourth figure is a flow chart of the disc identification method. First, if it is necessary to identify the type of disc being placed, step 4〇1 displays 2" to open the LD 113 for (3) in the disc reproducing system. Step 4〇2 displays ^ focus drive voltage (F0D) to focus actuator 115 to facilitate up and down shifting of focus actuator 11 in the disc reproduction system to perform a seek focus mode. 2, the -FE signal is detected in the search focus mode. Then, the step displays the peak value of the _ signal. Please refer to Figure 2A to Figure %. j The FE signal that is not detected in the FOD rising or falling range. Step 4〇4 f = f measured FE peak compared to the preset reference value (TH). If the peak of the peak is larger than the preset reference value, confirm that the disc is CD = Γ; Γ 5 display control in fine regeneration mode, and the disc value (T: m, the peak-to-peak value of the focus error signal is not preset Refer to Open the clock in this take 3 tolerant disc for the dvd-type disc # 'Step 4〇6 display control to take out the ^ 啻 ^ 啻 second regeneration system dvd for ld. Step 4 〇 7 display send :::: electricity (F0D) to the focus actuator 115 to move up and down the set focus actuator 115' to perform the search focus mode. The number of signal peaks. Figure 3a shows the rise in the search focus i ^ FOD (four) 'detection RF total signal and 3B picture are displayed in the search

9696pi f1.ptc Page 15 _ , the RF total signal measured in the focus mode, in step 408 shows 1298487 modified 911 91115277 ^ Ί β 5, invention description (8) during the FOD drop of the focus mode, speculation Swollen total signal. Step 409 shows that if the number of peaks of the summation signal is not 2, it is confirmed that the disc currently placed is a single layer DVD, and the step 410 displays control to execute the DVD-SINGLE reproduction mode, and then the disc identification process is completed. On the same day, if the number of peaks of the R F plus total signal is 2, it is confirmed that the disc currently placed is a double-layer DVD, and the step 411 displays the control to be executed as the dvd-(10) slave reproduction mode. ># 依/^ stated. When the LD for the CD in the disc reproduction system is turned on, the search for the focus mode is detected, the "signal size" is detected, and the type of the disc to be placed is recognized. Thus, the identification of the CD type disc and the DVD type disc is enhanced. Accuracy rate ==,, when the LD for the CD is turned on, when the CD type disc and the DVD type disc are discriminated and confirmed to be placed on the disc type, according to the present invention: ^ Performing a search Focus mode, check the peak value of the measured RF total signal. When the LD for the IT is turned on, identify the disc type. In this way, enhance the accuracy of the early DVD or double-layer DVD. The present invention has been disclosed in the above preferred embodiments, but the invention may be modified and modified in various ways without departing from the scope of the invention. Therefore, this ', 濩 围 当 当 当 后 后 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Block diagram of the identification device; Figure 2A shows the measured focus mode of the loaded CD The waveform interval diagram, FIG. 2B shows the measured waveform interval diagram of the search focus mode for loading the single-layer DVD; FIG. 2C shows the measured waveform interval diagram of the search focus mode for loading the dual-layer DVD;

FIG. 3A is a diagram showing another measured waveform interval of a search focus mode for loading a single-layer DVD; FIG. 3B is a diagram showing another measured waveform interval of a search focus mode for loading a dual-layer DVD; 4 is a flow chart showing a method of discriminating a disc. [Main component symbol description]

101 Disc 110 Read/Write Unit 111 Objective lens 112 Beam splitter 113 Laser diode for CD 114 Laser diode for DVD 115 Focus actuator 116 Light source detector 120 RF signal and error signal processor 130 Servo unit

9696pi fl.ptc Page 17 1298487 Case No. 91 115277 Correction Simple description of the diagram 14 0: System control unit

9696pifl.ptc Page 18

Claims (1)

1298487 ——_I VI. Patent application scope 91115277 Correction 1. A disc discriminating method, the disc reproducing system of the data comprises: a type of discs of 14 discs used for reproducing or reproducing two or more discs, the method being opened and set in the disc reproducing apparatus 〜 a ~1 laser diode for execution - an optical medium for use in performing the search focus mode, focus mode; peak-to-peak; Comparing the value of the detected signal of the detected signal, identifying the disc and then preparing for the peak value, and confirming the disc type of the disc by the preset parameter. The optical medium, the disc disposed in the monument is turned into a laser diode of a second body, so that the second optical pin of the four-piece regeneration system recognizes the taiji bucket time π , - search for the focus mode; and the gentleman's bucket AA machine 4, the number of peaks in one of the obtained RF plus total letters, to identify the type of the disc placed. >2. The method for disc identification as described in claim 1 of the patent scope, wherein the credit is used. The peak-to-peak value of the hysteresis error signal is used to identify the type of the disc. If the peak-to-peak value of the focus error signal is greater than the preset reference value, confirm that the disc is a first optical medium. When the peak-to-peak value of the focus error signal is not greater than the preset reference value, confirm that the disc is a second potential Optical media. 3. The disc discriminating method of claim 1, wherein the number of the peaks of the radio frequency summed signal is used to identify the disc type, and the radio frequency is measured by a preset time. Whether the number of peaks of the summed signal is two, determining whether the disc is a single layer optical medium or a double layer optical 9696pifl.ptc Page 19 1298487 Case No. 91115277 Amendment 6. Patent application scope Media. 4. The disc identification method of claim 3, wherein the preset time is a supply of a focus drive voltage to perform a rising period or a falling period of the search focus mode. 5. The disc identification method according to claim 1, wherein the first optical medium device is a CD type and the second optical medium device is a DVD type. 6. A disc discriminating device for use in a disc reproducing system for reproducing two or more disc materials, the apparatus comprising: a reading and writing unit including a first type of optical medium for use in a laser a diode, and a second type of optical medium, a laser diode, and an optical detector for detecting the amount of light reflected from a disc; an RF signal and a servo error signal processor that controls the The power of the laser diode for the first optical medium, the laser diode for the second optical medium, and the amount of the beam measured by the optical detector to generate a focus error signal And a radio frequency summation signal; a servo unit that detects a size of the focus error signal generated by the radio frequency signal and the servo error signal processor; a system control unit that controls the radio frequency signal and the servo error signal processor and the a servo unit that causes the RF signal and the servo error signal processor to turn on the laser diode for the first optical medium to perform the search focus mode, according to the magnitude of the focus error signal being measured To recognize the type of the disc plate, if it is confirmed that the optical disc as a second medium, the RF signal and a servo error signal turns on the processor of the second optical medium with 9696pi fl.ptc Page 20 1298487 Case No. 91115277 Amendment 6. Applying the patent range laser diode to perform the search focus mode, according to the preset number of radio frequency summed signals, to identify the number The type of disc. 7. The disc discriminating device of claim 6, wherein the first optical media device is a CD type and the second optical media device is a DVD type. 8. The disc discriminating device of claim 6, wherein the preset time is to supply a focus drive voltage to the read/write unit to perform a rising period or a falling period of the search focus mode. 9696pifl.ptc Page 21