JP2010182357A - Optical disk device and method of discriminating the optical disk - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the time for discriminating an optical disk in consideration of a region where an optical disk is used. <P>SOLUTION: An LPP signal generating part 5 generates an LPP (Land Pre-Pit) signal from a reflected light signal of an optical disk 1. An ADIP signal generating part 6 generates an ADIP (Address In Pre-grove) signal from the reflected light signal. A signal determination part 7 determines presence/absence and levels of generated several kinds of signals. A microcomputer 8 discriminates the kind of an optical disk according the result of the signal determination part 7. The microcomputer 8 refers to region information of an optical disk device stored in an EEPROM 9, and causes the signal determination part 7 to change an order of determining the plurality of kinds of signals, in accordance with the region information. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an optical disc apparatus and an optical disc discrimination method capable of more quickly discriminating the type of an optical disc loaded.

  There are various types of optical disks, and it is necessary to switch conditions for recording and reproducing information corresponding to these types. For this reason, in an optical disk apparatus capable of mounting a plurality of types of optical disks, the type of the mounted optical disk must be accurately determined.

  A general disc discrimination method is to irradiate an optical disc with laser light and detect the sum level of reflected light (PE), focus error signal (FE) generated by the reflected light, tracking error signal (TE), etc. Compare with threshold. Also, in DVD-R / RW, an LPP (Land Pre-Pit) method in which pits indicating address information are arranged in a land area, and in DVD + R / RW, ADIP (Address In Pre-groove) in which address information is superimposed on a wobble phase signal. A system is employed to detect the presence or absence of these preformat signals. A disc can be discriminated by combining these results.

  For example, Patent Document 1 describes a technique for preventing erroneous detection of ADIP bits in an apparatus that can handle both LPP and ADIP optical disks.

JP 2003-123257 A

  Many procedures are performed in the apparatus for the setup process after the optical disk is loaded in the optical disk apparatus and before the actual recording and reproduction of data is started. As the types of optical discs that can be used by a single device increase, disc discrimination processing becomes more complicated and requires more time. On the other hand, the user is required to shorten the setup time, and it is necessary to shorten the disc discrimination time.

  In discriminating processes for various types of optical discs, the disc type is specified by combining a plurality of discriminating steps, but the execution order of each step is not necessarily appropriate from the viewpoint of shortening the discriminating time. In other words, the types of optical disks that are actually used vary depending on the region. For example, DVD-R / RW called “minus” is the mainstream in Japan, and DVD + R / RW called “plus” is mainstream in Europe and America. Therefore, if the order of the determination steps is determined by grasping the tendency, there is no useless process and the determination result can be obtained more quickly. In the conventional discrimination method, such a discrimination method paying attention to the regional difference is not considered at all.

  An object of the present invention is to shorten the discriminating time in discriminating an optical disc in consideration of the deviation depending on the region of the optical disc to be used.

  An optical disc apparatus according to the present invention includes an optical pickup that irradiates an optical disc with laser light and detects a reflected light signal thereof, an FE signal generation unit that generates an FE (focus error) signal from the reflected light signal, and an address from the reflected light signal. An LPP signal generation unit that generates an LPP (Land Pre-Pit) signal indicating information, an ADIP signal generation unit that generates an Address In Pre-groove (ADIP) signal indicating address information from the reflected light signal, and a plurality of generated A signal determination unit that determines the presence / absence and level of a signal of a type, a microcomputer that determines the type of the optical disk based on the determination result of the signal determination unit, and an EEPROM that stores area information of the optical disk device . The microcomputer refers to the area information stored in the EEPROM and causes the signal determination unit to switch the order of determining them for a plurality of types of signals according to the area information.

  If the area information is an area where DVD-R / RW (minus system) is mainly used, the LPP signal is determined prior to the ADIP signal, and the area information is mainly DVD + R / RW (plus system). If the area is used in the area, the determination of the ADIP signal precedes the LPP signal.

  The present invention is an optical disc discrimination method for discriminating the type of an optical disc by irradiating a loaded optical disc with laser light and detecting a plurality of types of signals from the reflected light, according to the area information set in the optical disc apparatus. Thus, the order of detecting the plurality of types of signals is switched.

  According to the present invention, the optical disc discrimination time and the setup time including it are shortened, and the usability of the user is improved.

1 is a block diagram showing an embodiment of an optical disc apparatus according to the present invention. The figure which shows the example of the regional information (region code) of an optical disk device. The figure which shows an example of the flowchart of disk discrimination | determination. The figure which shows an example of the flowchart of disk discrimination | determination.

  FIG. 1 is a block diagram showing an embodiment of an optical disc apparatus according to the present invention. Various optical disks 1 such as DVD-ROM, DVD-RAM, DVD-R, DVD-RW, DVD + R, and DVD + RW can be mounted on this apparatus, and data is recorded and reproduced by irradiating them with laser light. To do.

  The optical disk 1 is rotated by a spindle motor 2. The optical pickup 3 irradiates a laser beam with a predetermined intensity to detect a mounted optical disc, detects reflected light from the optical disc, and converts it into an electrical signal. Based on this detection signal, the FE signal generation unit 4 generates an FE (focus error) signal for focus control, and for address control, the LPP signal generation unit 5 transmits an LPP (Land Pre-Pit) signal to ADIP. The signal generator 6 generates an ADIP (Address In Pre-groove) signal. The signal determination unit 7 determines the presence / absence and level of each of these signals and outputs them to the microcomputer 8.

  As described above, the LPP signal is a signal that exists only in DVD-R / RW, and the ADIP signal is a signal that exists only in DVD + R / RW. The LPP signal generation unit 5 acquires address information from a pit (LPP) signal peculiar to a DVD-R / RW that is formed in a land area according to a certain rule among preformat signals detected from reflected light. The ADIP signal generation unit 6 acquires address information for the preformat signal detected from the reflected light by detecting the phase inversion of the wobble signal peculiar to DVD + R / RW.

  The microcomputer 8 determines the type of the mounted optical disk 1 based on the determination result of each signal sent from the signal determination unit 7. Then, the recording operation and the reproduction operation are controlled according to the determination result. In this figure, the recording / reproducing processing circuit and the control mechanism are omitted. The EEPROM 9 stores area information (region code) of the optical disk device. This area information is set for each destination at the time of shipment of the optical disk apparatus. Alternatively, the area information (region code) described on the disk can be read when the optical disk is loaded, and the read area information can be copied to the EEPROM 9. The microcomputer 8 refers to the area information stored in the EEPROM 9 and controls the disc determination process (determination order) according to the area information. That is, the order of signals (FE, LPP, ADIP) determined for the signal determination unit 7 is switched.

  Here, the area information stored in the EEPROM 9 is provided for copyright protection in DVD disk reproduction, and each optical disk apparatus is set with a unique area number as area information. When performing copyright protection, only a DVD disc having area information corresponding to the set area number can be reproduced. In this embodiment, the discriminating information is efficiently performed by using this area information.

  FIG. 2 is a diagram showing an example of region information (region code) of the optical disk device stored in the EEPROM 9. Here, a definition example of a region number is shown. Region numbers 1 to 8 are set (7 and 8 are unused), and the whole world is divided into 6 regions and region codes are given. Among these, for example, Japan belongs to region number 2 (region code “02h”). The region code “02h” is set in the EEPROM 9 when the DVD having the region number 2 is reproduced.

  Here, the types of optical disks that are actually used vary depending on the region. For example, DVD-R / RW called “minus” is the mainstream in Japan, and DVD + R / RW called “plus” is mainstream in Europe and America. Therefore, in Japan, DVD-R / RW is more likely to be used than DVD + R / RW, and the process of determining DVD-R / RW is prioritized. Outside Japan, there is a high possibility that DVD + R / RW is used, and priority is given to the step of determining DVD + R / RW. Which is prioritized is determined with reference to a region number (region code) set in the apparatus.

  3 and 4 are diagrams showing an example of a flowchart for disc discrimination. Here, DVD-R, DVD + R, DVD-ROM (above, first group), DVD-RW, DVD + RW, DVD-RAM (above, second group) are discriminated as disc types. The order of the discrimination process is controlled by the microcomputer 8.

  When the optical disc is loaded, the optical pickup 3 detects the reflected light from the disc surface and starts disc discrimination. In S100, the signal determination unit 7 compares the amplitude of the FE signal generated by the FE signal generation unit 4 with a threshold value. If it is larger than the threshold value, it is determined to belong to the first group (DVD-R, DVD + R, DVD-ROM), and if it is smaller than the threshold value, it is determined to belong to the second group (DVD-RW, DVD + RW, DVD-RAM). The first group is shown in FIG. 3, and the second group is shown in FIG.

  In the case of the first group having a large FE amplitude in FIG. 3, the region code is read from the EEPROM 9 in S101, and it is determined whether or not the code value is “02h” in Japan. If the code value is “02h”, the process proceeds to S102, and the signal determination unit 7 determines the presence or absence of the signal for the LPP signal generated by the LPP signal generation unit 5. If there is an LPP signal, it is determined in S103 that the disc is a DVD-R (DVD + R and DVD-ROM do not have an LPP signal). If there is no LPP signal, the process proceeds to S104, and the signal determination unit 7 determines the presence or absence of the signal for the ADIP signal generated by the ADIP signal generation unit 6. If there is an ADIP signal, it is determined in S105 that the disc is a DVD + R. If there is no ADIP signal, it is determined in S106 that the disc is a DVD-ROM.

  On the other hand, if the code value is other than “02h” in S101, the process proceeds to S107, and the signal determination unit 7 determines the presence or absence of the signal for the ADIP signal generated by the ADIP signal generation unit 6. If an ADIP signal exists, it is determined in S108 that the disc is a DVD + R (DVD-R and DVD-ROM do not have an ADIP signal). If there is no ADIP signal, the process proceeds to S109, and the signal determination unit 7 determines the presence / absence of a signal for the LPP signal generated by the LPP signal generation unit 5. If there is an LPP signal, it is determined in S110 that the disc is a DVD-R. If there is no LPP signal, it is determined in S111 that the disc is a DVD-ROM.

  Next, in the case of the second group having a small FE amplitude in FIG. 4, in S201, the region code is read from the EEPROM 9, and it is determined whether or not the Japanese code value is “02h”. If the code value is “02h”, the process proceeds to S202, and the signal determination unit 7 determines the presence or absence of the signal for the LPP signal generated by the LPP signal generation unit 5. If there is an LPP signal, it is determined in S203 that the disc is a DVD-RW (DVD + RW and DVD-RAM do not have an LPP signal). If the LPP signal does not exist, the process proceeds to S204, and the signal determination unit 7 determines the presence / absence of the signal for the ADIP signal generated by the ADIP signal generation unit 6. If there is an ADIP signal, it is determined in S205 that the disc is DVD + RW. If there is no ADIP signal, it is determined in S206 that the disc is a DVD-RAM.

  On the other hand, if the code value is other than “02h” in S201, the process proceeds to S207, and the signal determination unit 7 determines the presence or absence of a signal for the ADIP signal generated by the ADIP signal generation unit 6. If there is an ADIP signal, it is determined in S208 that the disc is DVD + RW (DVD-RW and DVD-RAM do not have an ADIP signal). If there is no ADIP signal, the process proceeds to S209, and the signal determination unit 7 determines the presence / absence of a signal for the LPP signal generated by the LPP signal generation unit 5. If there is an LPP signal, it is determined in S210 that the disc is a DVD-RW. If there is no LPP signal, it is determined in S211 that the disc is a DVD-RAM.

  As described above, in this embodiment, the region code of the apparatus is determined in S101 or S201, and the subsequent determination order is switched. If the code value is “02h” in Japan, the presence / absence of the LPP signal is preceded, and if it is other than the code value “02h” in Japan, the presence / absence of the ADIP signal is preceded. Since there is a high possibility that DVD-R / RW is used in Japan, the discrimination process often ends at the stage of the judgment of the presence or absence of an LPP signal (S102, S202). In addition, since DVD + R / RW is highly likely to be used outside of Japan, the determination process often ends at the stage of determining whether there is an ADIP signal (S107, S207). Therefore, it is not necessary to perform the determination twice for the LPP signal and the ADIP signal, so that the determination time can be shortened.

  In the above embodiment, the condition is whether the region code is “02h” belonging to Japan. This is an example, and it is only necessary to change the determination order so as to precede the determination of the type of the disk that is likely to be used in accordance with the relationship between each region and the type of the disk used there. .

1 ... Optical disc,
2 ... Spindle motor,
3 ... Optical pickup,
4 ... FE signal generator,
5 ... LPP signal generator,
6 ... ADIP signal generator,
7: Signal determination unit,
8 ... Microcomputer,
9 ... EEPROM.

Claims (4)

In an optical disc apparatus that records and reproduces data by irradiating a laser beam on a mounted optical disc,
An optical pickup for irradiating the optical disk with laser light and detecting a reflected light signal;
An FE signal generation unit that generates an FE (focus error) signal from the reflected light signal;
An LPP signal generation unit that generates an LPP (Land Pre-Pit) signal indicating address information from the reflected light signal;
An ADIP signal generation unit that generates an ADIP (Address In Pre-groove) signal indicating address information from the reflected light signal;
A signal determination unit for determining the presence or level of a signal for the plurality of types of generated signals;
A microcomputer for determining the type of the optical disk based on the determination result of the signal determination unit;
An EEPROM storing the area information of the optical disk device,
The microcomputer refers to area information stored in the EEPROM, and causes the signal determination unit to switch the order of determining the plurality of types of signals according to the area information. apparatus. The optical disc apparatus according to claim 1,
If the area information is an area where DVD-R / RW (minus system) is mainly used, the LPP signal is determined prior to the ADIP signal, and the area information is mainly DVD + R / RW (plus system). In the optical disk apparatus, the ADIP signal determination is preceded by the LPP signal when the area is used for the recording medium. A method of discriminating an optical disc by irradiating a mounted optical disc with laser light and detecting a plurality of types of signals from the reflected light to discriminate the type of the optical disc,
A method of discriminating an optical disc, wherein the order of detecting the plurality of types of signals is switched according to area information set in the optical disc apparatus. In the discriminating method of the optical disk according to claim 3,
The plurality of types of signals to be detected include an LPP (Land Pre-Pit) signal indicating address information and an ADIP (Address In Pre-groove) signal,
When the area information is an area where DVD-R / RW (minus system) is mainly used, the LPP signal detection precedes the ADIP signal, and the area information is mainly DVD + R / RW (plus system). In the case of an area used for the optical disc, the detection method of the ADIP signal precedes the LPP signal.

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