JP2010118113A - Disk driving device and disk discrimination method - Google Patents

Abstract

A disk can be used even when a sensor for determining the number of disk layers is broken.
The output signal of the sensor changes depending on the presence / absence of a discrimination hole. The output signal of the sensor is read and the number of layers is determined (S3). Regardless of the disk inserted due to a sensor failure, it is always determined that the disk is a double-layer disk, and parameter settings for the double-layer disk are performed. In S8, it is determined whether or not the focus servo and tracking servo are locked. If not locked, parameter setting for the single-layer disc is performed in S24, and it is determined whether or not the lock has been made. When the disk is locked, it is determined whether or not the disk is a single-layer disk based on the information read from the disk in S25. If it is confirmed that the disc is a single-layer disc, a recordable / reproducible state is entered (S26).
[Selection] Figure 6

Description

  The present invention relates to a disk drive apparatus for recording and / or reproducing a plurality of types of optical disks having different numbers of recording layers, and a disk determination method for determining optical disks having different numbers of layers.

  Known types of optical disks that are put into practical use include compact disks (hereinafter referred to as CDs), DVDs (Digital Versatile Discs), Blu-ray disks (hereinafter referred to as BDs), and the like. As the disk drive apparatus, an apparatus capable of handling (recording / reproducing) these plural types of optical disks is desirable. CDs, DVDs, BDs, etc. have the same disk diameter, so that the drive device can be shared.

  However, since the wavelength of the laser beam used for recording and / or reproduction, the write strategy (control of laser power during recording), and other parameters vary depending on the type of the disc, it is necessary to determine the type of the loaded disc. Become. Furthermore, it is also necessary to discriminate between DVD-R (Recordable), DVD-RW (ReWritable), DVD-ROM (Read Only Memory), DVD + R, and DVD + RW. Similarly, BD-ROM, BD-R, and BD-RW need to be identified for BD. In addition, in DVD and BD, the write strategy and other various parameters are different between the single-layer disc and the double-layer disc, so it is necessary to determine how many layers the disc is.

  These CDs, DVDs, BDs, etc. are all bare discs. When discs are discriminated, a laser beam is irradiated to the discs, and the disc type is determined based on the reflected light (reproduction signal) from the discs. It is made to discriminate. Patent Document 1 below describes that the type of an optical disc is discriminated and the optical pickup is switched. In Patent Document 1, a difference in the distance between the disk surface (the surface on the side where information recorded on the optical disk is read) and the signal surface is detected using one of the pull-in signal and the focus error signal, and the detection result of the optical disk is detected. The type is determined.

JP 10-199884 A

  The pull-in signal is, for example, a signal obtained by receiving return light from the optical disk by a four-divided photodetector, adding the output signals of the respective divided detectors, supplying the added signal to a low-pass filter, and removing high-frequency components by the low-pass filter. The pull-in signal has an amplitude level corresponding to the intensity of reflected light returning from the disk as a result of irradiating the optical disk with laser light. The focus error signal is a signal obtained by calculating the output signal of each divided detector of the four-split optical detector. The focus error signal has a center value, for example, an amplitude of zero level when the irradiated laser beam is in focus. Therefore, when the objective lens is gradually approached to the disk, the focus error signal becomes a signal having an S-shaped amplitude change.

  However, in practice, since there are many types of disks, it is necessary to reset each parameter according to each disk and repeat the read operation many times. As a result, there arises a problem that it takes time to discriminate.

  On the other hand, a disk medium containing an optical disk in a cartridge (hereinafter, this disk medium is referred to as a disk cartridge) is known. For example, there is a professional disc system used for broadcasting and business. A disk cartridge in a professional disk system is a disk in which a phase change disk is stored in a cartridge having excellent durability and dust resistance. As a disk cartridge, a single-layer disk having a recording capacity of 23.3 GB (gigabytes) and a double-layer disk having a recording capacity of 50 GB (gigabytes) are known.

  In the case of a disk cartridge, for example, holes are made in the cartridge in a pattern according to a predetermined rule, and a bit pattern is detected by a sensor corresponding to the presence or absence of the hole. The disc type can be discriminated based on the detected bit pattern. This discriminating method can be discriminated at the moment when the disc cartridge is inserted into the recorder and transported to the sensor position, so that it can be discriminated in a much shorter time than the discriminating method for the bare disc. .

  For example, Patent Document 2 below describes a process when a discriminating switch fails when discriminating a plurality of optical discs having different rotational speeds at the time of recording / reproduction based on the presence or absence of holes provided in the cartridge. Patent Document 2 describes that the rotation speed is set so that correct recording data is reproduced by switching the rotation speed.

Japanese Patent No. 3140796

  Further, in Patent Document 3 below, when the disc type detected based on the ID hole is different from the disc type detected by the TOC, there is a control content corresponding to the disc type detected by the TOC. It is described that it is set.

JP 07-235125 A

  As types of optical discs, optical discs having different numbers of recording layers are known. For example, an optical disk having a single recording layer and an optical disk having a two recording layer are known. A discrimination hole is formed in the cartridge corresponding to the difference in the recording layer. If the sensor for detecting the discriminating hole does not function normally for some reason, disc type discrepancies may occur. If the determination is wrong, various parameters that are optimal for recording and / or reproduction of the inserted disk cartridge cannot be set. As a result, there arises a serious problem that the disk cartridge cannot be normally recorded and / or reproduced. This defect is left until the user notices the abnormality of the sensor and repairs the disk drive device.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a disk drive device and a disk discrimination method capable of setting various parameters optimal for recording and / or reproduction of a mounted disk cartridge even if a sensor fails. is there.

In order to solve the above-described problems, the present invention provides a disk drive device in which a disk cartridge in which an optical disk is rotatably accommodated in a cartridge is mounted, and the optical disk is recorded and / or reproduced.
An optical head for accessing the optical disc;
A sensor unit for detecting a marking unit provided on the cartridge corresponding to the number of recording layers of the optical disc;
Whether the detection signal of the sensor unit is supplied, the recording layer sets a first parameter for recording and / or reproducing the first number of optical disks, and whether or not the servo locks with the set first parameter. And when the servo locks, determine that the recording layer is the first number,
When the servo does not lock, the second parameter for recording and / or reproducing the second number of optical disks whose recording layer is different from the first number is set, and the servo is locked with the set second parameter. A disc drive comprising: a controller for determining whether the recording layer is the second number when the servo is locked and the discrimination signal read from the optical disc indicates the second number Device.

  When the number of retries performed when the servo is not locked exceeds a preset upper limit value, an error saving process is performed.

  The first and second parameters are at least one of laser power and servo characteristics.

  When it is determined that the number of recording layers is the second number, a warning about a failure of the sensor unit is given.

The number of recording layers of the optical disc is 3 or more,
Until the servo is locked, the number of recording layers of the loaded optical disk is determined by sequentially changing the parameters.

The present invention includes a detection step of detecting by a sensor a marking portion provided on the cartridge corresponding to the number of recording layers of the optical disc;
The detection signal obtained in the detection step is supplied, the recording layer sets a first parameter for recording and / or reproducing the first number of optical disks, and the servo locks with the set first parameter. Whether the recording layer is the first number when the servo locks,
When the servo does not lock, the second parameter for recording and / or reproducing the second number of optical discs whose recording layer is different from the first number is set, and the servo is locked with the set second parameter Disc discriminating comprising: a control step for discriminating whether the recording layer is the second number when the servo is locked and the discriminating signal read from the optical disc indicates the second number Is the method.

  According to the present invention, when the disc layer number is mistakenly determined due to the abnormality of the sensor, it is detected that the disc is wrong, and various parameters that are optimum for recording / reproducing of the disc are set again. Alternatively, reproduction is realized. Further, it is possible to notify the user of the possibility of abnormality in the sensor by a warning display or the like, and to prompt the inspection of the apparatus.

The best mode for carrying out the invention (hereinafter referred to as an embodiment) will be described below. The description will be given in the following order.
1. First Embodiment 2. FIG. Second Embodiment 3. FIG. The embodiment described below is a preferred specific example of the present invention, and various technically preferable limitations are given. However, the scope of the present invention is particularly limited to Unless stated to limit the invention, it is not limited to these embodiments.

<1. First Embodiment>
"Disk Drive Configuration"
FIG. 1 shows a schematic configuration of a disk drive apparatus to which the present invention can be applied. The present invention can be applied to any of a read-only disk drive device and a recordable / reproducible disk drive device.

  The disc cartridge 1 has a configuration in which an optical disc 2 is stored in a cartridge 3. A specific example of the disk cartridge 1 will be described later. The optical disc 2 can record data by a phase change recording method, for example. Laser light having a wavelength of 405 nm is used. One of a single-layer (single-layer) disc having one recording layer and a two-layer disc having two recording layers is inserted into the disc drive apparatus. For example, the recording capacity of a single-layer disc is 23.3 GB, and the recording capacity of a double-layer disc is 50 GB.

  Information signals are recorded / reproduced by the optical head 4 with respect to the optical disk 2 inserted into the disk drive device. The optical disk 2 is rotated by the spindle motor 5 at a predetermined rotation speed. The optical disc 2 is irradiated with recording laser light or reproduction laser light from the optical head 4.

  The optical head 4 includes an objective lens, a biaxial actuator for displacing the objective lens (laser beam position) in the focus direction and the tracking direction, a laser diode, a photodetector that receives reflected light from the optical disc 2, a lens, and the like. And an optical system. The biaxial actuator is constituted by an electromagnetic actuator. The entire optical head 4 is moved in the radial direction of the optical disc 2 by a thread motor (not shown).

  The disc cartridge 1 is inserted in the horizontal direction with respect to the disc drive device, and then the disc cartridge 1 is moved downward, so that the rotating shaft of the spindle motor 5 is inserted into the central hole of the optical disc 2. 1 sits down. A discrimination hole 6 is formed on the lower surface of the cartridge 3 of the disk cartridge 1. The type of the disk cartridge 1 is determined based on the presence or absence of the determination hole 6. As an example, the discrimination hole is not formed in the case of a single-layer disc, and the discrimination hole 6 is formed only in the case of a dual-layer disc.

  When the disc cartridge 1 is seated on the spindle motor 5, a sensor 7 is provided in which the protrusion 8 is located at the same position as the discrimination hole 6. As an example, the protrusion 8 is lifted upward by a spring, and when the disc cartridge 1 is a double-layer disc and the cartridge 3 has a discrimination hole 6, the projection 8 is used for discrimination. It is inserted into the hole 6. Although not shown, a mechanical sensor switch is provided inside the sensor 7.

  In a state where the protrusion 8 is inserted into the discrimination hole 6, the sensor switch is turned off. If the disk cartridge 1 is a single-layer disk and does not have the discrimination hole 6, the protrusion 8 is pushed down by the lower surface of the cartridge 3 to turn on the sensor switch. Thus, the presence / absence of the discrimination hole 6 is detected by ON / OFF of the sensor switch. The sensor switch of the sensor 7 corresponding to the presence / absence of the discrimination hole 6 is supplied with an ON / OFF signal to the control unit 26.

  At the time of recording, recording data from the host processor 21 is supplied to the recording signal processing unit 24 via the interface 23. In the recording signal processing unit 24, recording data is generated. Recording data is supplied to the optical head 4, a recording beam whose intensity is modulated according to the recording data is output from the optical head 4, and the recording data is recorded as a phase change on the recording layer of the optical disc 2.

  The reproduction RF signal read from the optical disk 2 of the disk cartridge 1 by the optical head 4 is supplied to the reproduction signal processing unit 25. Reproduction data output from the reproduction signal processing unit 25 is output to the host processor 21 via the interface 23. The host processor 21 has a display unit 22. An example of the host processor 21 is a personal computer.

  A control unit 26 that controls the operation of the entire disk drive device is provided. The control unit 26 is a microprocessor including, for example, a CPU (Central Processing Unit) or a DSP (Digital Signal Processor). The control unit 26 performs overall control of each unit of the disk drive device by executing a program stored in a memory connected to the CPU of the control unit 26.

  By the servo control function of the control unit 26, the rotation speed of the spindle motor 5 is maintained at a predetermined speed. A focus error signal and a tracking error signal are supplied from the optical head 4 to the control unit 26. An optical head control signal is supplied from the control unit 26 to the biaxial actuator of the optical head 4 so that the tracking position and the focus position of the optical head 4 are controlled appropriately. Further, a control signal is supplied from the control unit 26 to the sled motor for moving the optical head 4. In the servo control of the control unit 26, it can be determined whether or not each servo is locked based on the level of the focus error signal and the level of the tracking error signal.

  At the time of recording, a control signal from the control unit 26 is supplied to the recording signal processing unit 24, and parameter setting at the time of recording, for example, the power of the recording laser beam is controlled according to the number of layers of the optical disk. Control of the power of the recording laser beam is referred to as write strategy processing. At the time of reproduction, a control signal from the control unit 26 is supplied to the reproduction signal processing unit 25, and parameter setting at the time of reproduction, for example, the power of reproduction laser light is controlled. In addition to the laser power, servo characteristics (for example, gain characteristics) of the focus servo and servo characteristics (for example, gain characteristics) of the tracking servo are set according to the number of layers of the optical disk. The reproduction signal processing unit 25 converts the reproduction RF signal into reproduction data, and decodes an error correction code (error correction). Whether or not the error has been corrected is supplied to the CPU of the control unit 26 as error correction information.

"Example of disc cartridge"
A specific example of the disk cartridge 1 to which the present invention can be applied will be described with reference to FIGS. As shown in FIGS. 2 to 4, the disc cartridge 1 accommodates an optical disc 2 serving as a recording medium in a cartridge 3 so as to be rotatable. Specifically, the inner rotor 11 and the pair of shutter plates 12a and 12b that accommodate the optical disk 2 in a rotatable manner are accommodated inside the cartridge 3.

  The optical disk 2 accommodated in the disk cartridge 1 has the same diameter (12 cm) as, for example, a CD or DVD. A center hole 2a is formed at the center for engaging the disk rotation drive mechanism on the drive device side. In recording and / or reproduction, a light beam having a wavelength of about 400 nm is used, and an objective lens of the optical head 4 having a higher numerical aperture than that of an objective lens used in a CD or DVD is used. As a result, data such as still image data, moving image data, music data, and processing data processed by a computer can be recorded at a higher density than CD and DVD.

  The cartridge 3 for storing the optical disk 2 is composed of an upper shell 13 and a lower shell 14 divided into two to be abutted against the upper shell 13. The upper shell 13 and the lower shell 14 are made of, for example, a polycarbonate resin having high heat resistance and high strength. On the bottom surface of the cartridge 3, an opening 15 is formed between the shell halves 14 a and 14 b constituting the lower shell 14 and into which the optical head 4 and the disk table constituting the disk rotation driving mechanism enter.

  The opening 15 includes an opening 15 a into which the optical head 4 on the drive device side enters the front side of the cartridge 3 and an opening 15 b into which the optical head 4 enters on the back side of the cartridge body. A substantially central portion of the bottom surface of the cartridge 3 between the opening 15a and the opening 15b is an opening 15c for disk rotation driving. The openings 15 a and 15 b are formed to have a size sufficient to allow the optical head 4 to enter the inside of the cartridge 3. The rotation drive opening 15c is formed to have a size sufficient to allow the disk table constituting the disk rotation drive mechanism of the drive device to enter the inside.

  A plurality of positioning holes 16a and 16b for positioning when the cartridge 3 is mounted on the drive device are provided on the lower surface of the cartridge 3 formed by the lower shell 14. Further, a discrimination hole 6 is provided in the vicinity of the positioning hole 16a. As described above, the type of the disk cartridge 1 is determined based on the presence / absence of the determination hole 6. In the case of a single-layer disc, the discrimination hole is not formed, and the discrimination hole 6 is formed only in the case of a double-layer disc. Further, the disc cartridge 1 is a professional disc, and an identification concave portion 17 for discriminating it from a consumer disc is formed on the upper surface side of the cartridge 3.

  Before the disc cartridge 1 having the above-described configuration is mounted on the drive device, the pair of shutter plates 12 a and 12 b are locked at the closed position of the opening 15. The disc cartridge 1 is loaded into the drive device with the front surface of a substantially arc as the insertion end. When the disc cartridge 1 is inserted into the drive device in the horizontal direction, first, the opening operation of the shutter plates 12a and 12b starts.

  Next, the disk cartridge 1 moves downward, and a seating state in which the rotating portion of the spindle motor is fitted in the center hole 2a is brought about. The optical head 4 enters from the opened side 15 of the disk cartridge 1 from the front side and / or the back side. The optical disk 2 is driven to rotate by a disk rotation drive mechanism. Recording and reproduction are performed by irradiating the signal recording surface with the light beam emitted from the optical head 4 and detecting the return light beam reflected by the signal recording surface by the optical head 4. When the disk cartridge 1 is ejected from the drive device, the pair of shutter plates 12 a and 12 b closes the opening 15 of the cartridge 3.

"Operation after inserting a conventional disc"
A conventional operation after inserting the disc will be described with reference to the flowchart of FIG. The processing or control shown in this flowchart is performed under the control of the CPU of the control unit. When the disc cartridge is inserted in step S0, the operation in step S1 is performed. That is, the disk cartridge is conveyed in the horizontal direction. Next, the disc cartridge moves in the vertical direction, and is seated in a state where the rotation shaft of the spindle motor is inserted into the center hole of the optical disc. When conveyance is completed, recording and / or reproduction is possible. When seated, the output signal of the sensor 7 changes depending on the presence or absence of the discrimination hole 6.

  In step S2, the control unit 26 reads the output signal of the sensor 7. In step S3, the number of layers of the disc is determined. If the discrimination hole 6 is not present, it is determined that the disc is a single-layer disc, and parameters for the single-layer disc are selected in step S4. If the discrimination hole 6 is present, it is determined that the disc is a double-layer disc, and parameters for the double-layer disc are set in step S5.

  In step S6, the spindle motor 5 is activated and the optical disc 2 starts to rotate. In step S7, focus servo and tracking servo pull-in starts. In step S8, it is determined whether or not the focus servo and tracking servo are locked. If the servo is not locked, it is determined in step S9 whether a timeout has occurred.

  If it is determined in step S9 that a timeout has occurred, an error saving process (step S10) is performed. For example, a message indicating that the disk inserted in the display device of the host processor cannot be used is displayed. In step S7, step S8, and step S9, it is described that both focus servo and tracking servo are performed. However, in practice, the focus is first locked by the focus servo, and then the tracking servo is locked.

  If it is determined in step S8 that the focus servo and tracking servo are locked, in step S11, information relating to the disk cartridge recorded in advance as management data in the innermost area of the disk is read. For example, a unique number assigned to each disc, disc structure information, information necessary for disc recording, and the like are recorded in advance in the innermost area. When necessary information is read in step S11, recording and / or reproduction is possible.

  Here, let us consider a case where the protrusion 8 of the sensor 7 is broken from the root for some reason. Then, since the protrusion 8 is not pushed by the bottom surface of the disk cartridge 1, the sensor 7 always outputs the state that “the hole is open”. That is, in the determination step S3 in FIG. 5, it is determined that a disk in which the discrimination hole 6 is formed (that is, a two-layer disk) is inserted regardless of the actually inserted disk. According to the determination result, parameter setting for the double-layer disc is performed in step S5.

  Actually, if the parameter setting for the dual-layer disc is performed even though the disc cartridge mounted on the disc drive device is a single-layer disc, recording and / or recording with an inappropriate write strategy or read power is performed. Playback is done. As a result, normal recording and / or reproduction cannot be performed. Furthermore, since the servo parameters are different between the single-layer disc and the double-layer disc, the focus servo and tracking servo become very unstable. In particular, in the focus servo, since the method of finding the focus target surface is different between the single-layer disc and the double-layer disc, the focus servo cannot be applied. That is, if the parameter setting is not correct, the servo cannot be locked and timed out, and the process proceeds to the error saving process (step S10).

“Operation after inserting the disc in the first embodiment”
The operation after inserting the disc according to the first embodiment of the present invention will be described with reference to the flowchart of FIG. The corresponding steps in the flowchart of FIG. 5 described above will be denoted by the same reference numerals. The processing or control shown in this flowchart is performed under the control of the CPU of the control unit 26.

  When the disc cartridge is inserted in step S0, the operation in step S1 is performed. That is, the disk cartridge is conveyed in the horizontal direction. Next, the disc cartridge moves in the vertical direction, and is seated in a state where the rotation shaft of the spindle motor is inserted into the center hole of the optical disc. When conveyance is completed, recording and / or reproduction is possible. When seated, the output signal of the sensor 7 changes depending on the presence or absence of the discrimination hole 6.

  In step S2, the control unit 26 reads the output signal of the sensor 7, and the number of layers of the disc is determined based on the output signal of the sensor 7 (step S3). Since it is assumed that the projecting portion 8 of the sensor 7 is broken from the root for some reason, the sensor 7 always outputs a “hole is open” state. Accordingly, in step S3, it is determined that a disk in which the discrimination hole 6 is formed (that is, a two-layer disk) is inserted regardless of the actually inserted disk. Then, in step S5, parameter setting for the double-layer disc is performed.

  In step S21, the count value of the retry counter is initialized to zero. The retry counter is incremented by one each time the parameter setting is changed and focus servo and tracking servo are started. The retry counter is provided in the control unit 26. Thereafter, in step S6, the spindle motor 5 is activated and the optical disc 2 starts to rotate. In step S7, focus servo and tracking servo pull-in starts. In step S8, it is determined whether or not the focus servo and tracking servo are locked.

  When a double-layer disk is actually inserted into the disk drive device in which the sensor 7 has failed as described above, a double-layer disk parameter is set in step S5. Since the set parameters match the actually inserted disk, it is determined in step S8 that the focus servo and tracking servo are locked. In step S11, information relating to the disk cartridge recorded in advance as management information in the area of the innermost peripheral portion of the disk is read. For example, a unique number assigned to each disc, disc structure information, information necessary for disc recording, and the like are recorded in advance in the innermost area.

  When necessary information is read in step S11, recording and / or reproduction is possible. Step S25 is provided after step S11. In step S25, it is determined whether or not it is a single-layer disc. This step S25 is processing for confirmation when the first layer parameter is set and the servo is locked.

  When the single-layer disk is actually inserted into the disk drive device in which the sensor 7 has failed as described above, the parameters for the double-layer disk are set in step S5. As a result, the focus servo and / or tracking servo is not locked, and there is a high possibility that it is determined in step S9 that a timeout has occurred.

  If it is determined in step S9 that timeout has occurred, the retry counter is counted up (ie, the count value is +1) in step S22. In step S23, it is determined whether or not the number of retries (count value) has reached a preset upper limit value. When the number of retries reaches the upper limit value, the retry cannot be performed.

  If it is determined in step S23 that the number of retries has reached the upper limit value, error saving processing is performed in step S10. For example, a message indicating that the disk inserted in the display device of the host processor cannot be used is displayed. During the error saving process, the rotation by the spindle motor is stopped and the standby state is set. If it is determined in step S23 that the number of retries has not reached the upper limit, parameter setting for a single-layer disc is performed in step S24. That is, in step S24, the set parameter is changed from the parameter for the two-layer disc to the parameter for the one-layer disc.

  After step S24, the process proceeds to step S7 (start of focus servo and tracking servo). Since the parameters for the single-layer disc are set, the focus servo and tracking servo are locked, and the determination result in step S8 becomes affirmative. In step S11, information relating to the disk cartridge recorded in advance in the area of the innermost peripheral portion of the disk is read.

  When necessary information is read in step S11, it is determined in step S25 whether or not it is a single-layer disc based on the read information. If it is confirmed in step S25 that the disc is a single-layer disc, the set parameter matches the disc type, and a recordable and / or reproducible state is entered (step S26). In step S26, a warning is displayed to the user. The warning is displayed using the display unit 22 of the host processor 21.

  For example, “Although parameter setting was performed according to the discrimination result by the sensor, the servo could not be locked and timed out, so when parameter setting for another disk was retried and retried, it was able to return to normal. A warning message saying "There is a possibility" is displayed. In addition to displaying a message, a message (warning) sound may be reproduced. The reason for giving such a warning is to prompt the user to repair the sensor and quickly regain the original comfortable operation feeling of the drive, because it has a demerit that it takes time, although it can be recovered by retry.

"Modification of the first embodiment"
In the above description, it is assumed that a discrimination hole is formed in the case of a two-layer disc. However, the present invention can also be applied to a case where a discrimination hole is formed in the case of a single-layer disc. In this case, if there is a hole, it is determined that the disc is a single-layer disc, and parameters for the single-layer disc are set in step S5. Further, in step S24, the parameters for the double-layer disc are set. Further, it may be possible to store, by a flag, which parameter for the first layer or the second layer is determined first, and select a parameter to be set next with reference to the flag.

<2. Second Embodiment>
"Determination hole and sensor"
Next explained is the second embodiment of the invention. In the second embodiment, a plurality of, for example, two discriminating holes are formed in the disc cartridge, and a plurality of types, for example, four types of disc cartridges are discriminated.

  As shown in FIG. 7, the presence / absence of a discrimination hole is defined corresponding to the 1-layer, 2-layer, 4-layer, and 8-layer disc cartridges. A black circle indicates that there is no discrimination hole, and a white circle indicates that there is a discrimination hole. SE1 and SE2 represent two sensors. For example, in the case of a single-layer disc, the outputs of the sensors SE1 and SE2 both indicate that there is no discrimination hole. In the case of an 8-layer disc, the outputs of the sensors SE1 and SE2 both indicate that there is a discrimination hole.

  When the sensor fails, since two sensors are provided, a sensor failure mode as shown in FIG. 8 occurs. In FIG. 8, a double circle represents that the sensor is normal, a black circle represents a failure that always outputs that there is no discrimination hole, and a white circle represents a failure that always outputs that there is a discrimination hole. . For example, when only the sensor SE2 is broken, there are two possibilities: a failure in which the sensor SE2 always outputs that there is no discrimination hole, and a failure in which the sensor SE2 always outputs that there is a discrimination hole. .

  In the case of a failure in which the sensor SE2 always outputs that there is no discrimination hole, it is impossible to discriminate between the 4-layer and 8-layer disc cartridges, and it is possible to discriminate between the 1-layer disc and the 2-layer disc cartridge. Is possible. That is, as shown in FIG. 7, in the case of the 4-layer and 8-layer disk cartridges, it is necessary for the sensor SE2 to generate an output indicating that there is a discrimination hole. Such a failure is referred to as failure example 1.

  On the other hand, in the case of a failure in which the sensor SE2 always outputs that there is a discrimination hole, it is impossible to discriminate the 1-layer and 2-layer disc cartridges, and the 4-layer and 8-layer disc cartridges are discriminated. It is possible. That is, as shown in FIG. 7, in the case of the single-layer and double-layer disc cartridges, it is necessary for the sensor SE2 to generate an output indicating that there is no discrimination hole.

  Even when only the sensor SE1 is broken, there is a case where it is impossible to discriminate like the above-described failure of only the sensor SE2. Furthermore, when both the sensors SE1 and SE2 fail, the sensors SE1 and SE2 generate four types of outputs. For example, in the case of a failure in which the sensors SE1 and SE2 always output that there is no discrimination hole, only the single-layer disc cartridge can be discriminated, and the other three types of disc cartridges cannot be discriminated. Such a failure is referred to as failure example 2.

  In the case of failure example 1 described above, if the servo cannot be locked after the spindle motor is started, it can be determined that the mounted disk cartridge is either a 4-layer disk or an 8-layer disk. Therefore, the output of the sensor SE1 is referred to. Since the sensor SE1 has not failed, when the output of the sensor SE1 indicates that there is no discrimination hole, it can be discriminated as a four-layer disc, and when the output of the sensor SE1 indicates that there is a discrimination hole, It can be identified as an 8-layer disc. Therefore, in order to reduce the number of retries, when the output of the sensor SE1 indicates that there is no discrimination hole, the parameter setting for the four-layer disk is performed next and the retry is performed. On the other hand, when the output of the sensor SE1 indicates that there is a discrimination hole, the parameter setting for the 8-layer disc is set next and the retry is performed. Even when only the sensor SE2 fails, the type of disk to be parameterized next can be predicted.

  On the other hand, when both the sensors SE1 and SE2 fail as in failure example 2, such a prediction cannot be made. In this case, the retry order is determined in advance, then the parameters for the two-layer disk are set, and if the servo still does not lock, the parameters for the four-layer disk are set.

  Actually, since it is impossible to know in advance which sensor has failed, it is difficult to predict the type of disk to be parameterized next. If a detection device for detecting a sensor failure is separately provided, the state of the sensor failure can be known. However, in this case, there is a problem that the structure of the sensor unit is complicated. Therefore, in the second embodiment, a method of determining the retry order in advance is employed. For example, a retry is started from a disk with a small number of layers and is performed toward a disk with a large number of layers.

"Operation after inserting the disc in the second embodiment"
The operation after inserting the disc according to the second embodiment of the present invention will be described with reference to the flowchart of FIG. Steps corresponding to the steps in the flowcharts of FIGS. 5 and 6 described above are denoted by the same reference numerals. The processing or control shown in this flowchart is performed under the control of the CPU of the control unit 26.

  When the disc cartridge is inserted in step S0, the operation of step S1 (conveying the disc cartridge, opening the shutter, detecting the presence / absence of the discrimination hole 6) is performed. In step S2, the control unit 26 reads the output signal of the sensor 7, and the number of layers of the disc is determined based on the output signal of the sensor 7 (step S3).

  In step S3, it is determined whether the detected hole is a one-layer disc pattern, a two-layer disc pattern, a four-layer disc pattern, or an eight-layer disc pattern. If the result of the determination is a single-layer disc pattern, a single-layer disc parameter is set in step S4. If the result of the determination is a double-layer disc pattern, the parameters for the double-layer disc are set in step S51. If the determination result is a pattern of a four-layer disc, parameters for a four-layer disc are set in step S52. If the determination result is an 8-layer disc pattern, the 8-layer disc parameters are set in step S53.

  In step S21, the count value of the retry counter is initialized to zero. The retry counter is incremented by one each time the parameter setting is changed and focus servo and tracking servo are started. The retry counter is provided in the control unit 26. Thereafter, in step S6, the spindle motor 5 is activated and the optical disc 2 starts to rotate. In step S7, focus servo and tracking servo pull-in starts. In step S8, it is determined whether or not the focus servo and tracking servo are locked.

  If it is determined in step S8 that the focus servo and tracking servo are locked, in step S11, information relating to the disc cartridge that is recorded in advance as management information in the area of the innermost peripheral portion of the disc is read. For example, a unique number assigned to each disc, disc structure information, information necessary for disc recording, and the like are recorded in advance in the innermost area.

  When necessary information is read in step S11, recording and / or reproduction is possible. Step S25 is provided after step S11. In step S25, it is determined whether or not the number of layers for which the parameter is set matches the determination result obtained from the disc playback signal.

  In the disk drive device in which the sensor 7 has failed, there may be a case where the number of layers for which parameters are set does not match the determination result obtained from the disk playback signal. In this case, in step S8, it is not determined that the focus servo and tracking servo are locked, and in step S9, it is highly likely that it is determined that a timeout has occurred.

  If it is determined in step S9 that timeout has occurred, the retry counter is counted up (ie, the count value is +1) in step S22. In step S23, it is determined whether or not the number of retries (count value) has reached a preset upper limit value. When the number of retries reaches the upper limit value, the retry cannot be performed.

  If it is determined in step S23 that the number of retries has reached the upper limit value, error saving processing is performed in step S10. For example, a message indicating that the disk inserted in the display device of the host processor cannot be used is displayed.

  If it is determined in step S23 that the number of retries has not reached the upper limit value, it is determined in step S61 whether or not the parameter setting at this point is for a single-layer disc. If it is determined that it is not for a single-layer disc, it is determined in step S62 whether or not the parameter setting at this point is for a dual-layer disc. If it is determined that it is not for a two-layer disc, it is determined in step S63 whether or not the parameter setting at this point is for a four-layer disc. If it is determined that it is not for a four-layer disc, it is determined in step S64 whether or not the current parameter setting is for an eight-layer disc.

  If it is determined in step S61 that the current parameter setting is for a single layer disc, in step S71, a double layer disc parameter is set. In step S7, focus servo and tracking servo are started. Then, the processing shifts to a determination step S8 for locking the focus servo and tracking servo. When the servo is locked, it is determined as a double-layer disc.

  If the servo is not locked, step S9 (timeout determination), step S22 (retry counter count up), and step S23 (determination of whether the number of retries has reached the upper limit value) are performed. If the number of retries has not reached the upper limit value, the parameters for the four-layer disc are set in step S72. Thereafter, the same operation as that after the parameters for the double-layer disc are set is performed.

  As described above, starting from the parameter setting for the single-layer disk, the parameter setting for the two-layer disk, the parameter setting for the four-layer disk, and the parameter setting for the eight-layer disk are sequentially performed until the servo is locked. In step S25, it is determined whether or not the number of layers for which the parameter is set matches the determination result obtained from the disc playback signal. If they match, the recording and / or reproduction is possible (step S26). Further, a display is made to warn the user that there is a possibility that the sensor has failed using the display unit of the host processor.

<3. Modification>
The present invention is not limited to the above-described embodiment, and various modifications based on the technical idea of the present invention are possible. For example, the marking portion indicating the number of layers of the optical disc is not limited to the configuration in which the discrimination hole and the protrusion are fitted. For example, a configuration in which a hole and an optical sensor are combined, a configuration in which a reflection portion on the cartridge surface and an optical sensor are combined, information stored in a semiconductor memory provided in the cartridge, and the like can be used.

It is a block diagram of a 1st embodiment of this invention. 1 is a bottom view of an example of an optical disc that can be used in a first embodiment of the present invention. It is the perspective view seen from the upper surface side of an example of the optical disk which can be used for 1st Embodiment of this invention. It is the perspective view seen from the bottom face side of an example of the optical disk which can be used for the 1st Embodiment of this invention. 5 is a flowchart for explaining an operation after inserting a disk of a conventional disk drive device used for explaining the present invention. It is a flowchart used for operation | movement description of 1st Embodiment of this invention. It is a basic diagram which shows the relationship between the hole for discrimination | determination and sensor output of 2nd Embodiment of this invention. In a 2nd embodiment of this invention, it is an approximate line figure showing a kind of disc which can be discriminated when a sensor fails. It is a flowchart used for operation | movement description of 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Disc cartridge 2 ... Optical disc 3 ... Cartridge 4 ... Optical head 6 ... Discrimination hole 7 ... Sensor 8 ... Projection part 12a, 12b ... Shutter plate 24 ..Recording signal processing unit 25 ... reproduction signal processing unit 26 ... control unit

Claims (6)

A disk drive device in which a disk cartridge in which an optical disk is rotatably accommodated in a cartridge is mounted, and the optical disk is recorded and / or reproduced,
An optical head unit for accessing the optical disc;
A sensor unit for detecting a marking unit provided on the cartridge corresponding to the number of recording layers of the optical disc;
When the detection signal of the sensor unit is supplied, the recording layer sets a first parameter for recording and / or reproducing the first number of optical disks, and the servo locks with the set first parameter. Whether the recording layer is the first number when the servo locks,
When the servo is not locked, the recording layer sets a second parameter for recording and / or reproducing a second number of optical disks different from the first number, and the set second parameter It is determined whether or not the servo is locked, and when the servo is locked and the determination signal read from the optical disk indicates the second number, the recording layer is determined to be the second number. A disk drive device comprising a control unit.   The drive device according to claim 1, wherein error evacuation processing is performed when the number of retries performed when the servo is not locked exceeds a preset upper limit value.   2. The disk drive device according to claim 1, wherein the first and second parameters are at least one of laser power and servo characteristics.   The disk drive device according to claim 1, wherein when the recording layer is determined to be the second number, a warning about a failure of the sensor unit is given. The number of recording layers of the optical disc is 3 or more,
2. The disk drive device according to claim 1, wherein the number of recording layers of the optical disk loaded is determined by sequentially changing the parameters until the servo is locked. A detection step of detecting by a sensor a marking portion provided in the cartridge corresponding to the number of recording layers of the optical disc;
The detection signal obtained in the detection step is supplied, the recording layer sets a first parameter for recording and / or reproducing the first number of optical disks, and the servo is set by the set first parameter. Determine whether the recording layer is the first number when the servo is locked,
When the servo is not locked, the recording layer sets a second parameter for recording and / or reproducing the second number of optical disks different from the first number, and the set second parameter It is determined whether or not the servo is locked, and when the servo is locked and the determination signal read from the optical disk indicates the second number, the recording layer is determined to be the second number. A disk discrimination method comprising: a control step.

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