JP2003217135A - Optical disk drive, method for discriminating disk thereof and method for discriminating abnormality of chucking - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disk discriminating method for discriminating at least a DVD-RAM, DVD-R and DVD-RW. <P>SOLUTION: The discrimination is made as to whether the chucking is normal of erroneous, and the discrimination of the disk is carried out only when the chucking is normal. Also, a tracking error signal in the case of different disk radius is acquired, and by using it, the class of the disk is discriminated. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc apparatus for recording / reproducing information on / from a disc by using a semiconductor laser and a disc discriminating method thereof, and more particularly to a plurality of optical discs having different disc structures and disc format structures. Related to the discrimination technology.

[0002]

2. Description of the Related Art Conventional examples of recordable optical disks include CD-R / RW and DVD-R / RW / RAM. Of these discs, CD-based CD-R /
The RW and the DVD-type DVD-R / RW / RAM are different from each other in physical structural characteristics such as a disc thickness, a track pitch, a recording mark size, and a laser wavelength when recording on a medium. In addition, the same DVD type DVD-R / RW and DV
The D-RAM has a different format, particularly an address configuration.

As a structure of a disk device for recording / reproducing with respect to a plurality of recordable optical disks, a pickup and a signal processing LSI suitable for respective characteristics are provided.
A combination of is conceivable.

Japanese Unexamined Patent Publication No. 2001-243696 discloses an apparatus for optically discriminating a plurality of types of information recording media including a CD-R. That is, the first and second laser diodes that emit a plurality of light beams having mutually different wavelengths, and the reflected lights from the optical disc of the emitted light beams are respectively received and correspond to the received reflected lights, respectively. Disclosed is a discriminating apparatus including a pickup that outputs a detection signal and a servo IC that discriminates the type of an optical disk based on the ratio of output light receiving signals.

[0005]

Pickup and signal processing circuits and LSIs adapted to respective discs
In the optical disc device in which the above are combined, there is no problem in obtaining the predetermined characteristics, that is, the recording / reproducing characteristics for various types of discs, but the number of parts is large and the shape of the pickup is large. Therefore, there are problems in that the device becomes too large and the substrate cannot fit in a normal size due to the device configuration. In addition, the cost naturally rises. Further, problems such as a decrease in reliability due to an increase in the number of parts and heat generation due to an increase in power consumption occur.
Therefore, it is a problem to reduce the number of parts as much as possible and to reduce the size.

Further, CD-ROM, R, RW, DVD-
Recording / reproduction is performed on multiple discs of ROM, R, and RW. However, since these lasers have different laser wavelengths, substrate thicknesses, and formats, the address detection method and the like are different. Optical or electrical circuit selection is required. Therefore, there arises a problem that the disc discrimination time before the recording / reproducing operation becomes long. Therefore, how to perform disc discrimination in a short time is an issue.

Further, with the technique described in Japanese Patent Laid-Open No. 2001-243696, it is impossible to discriminate DVD-RAM.

An object of the present invention is to provide a technique for discriminating between a single-layer disc and a multi-layer disc. Also,
Another object of the present invention is to provide a disc discriminating technique capable of discriminating a disc more accurately by discriminating whether chucking is normal or mischucking, and discriminating the disc only when the chucking is normal. It is in providing. Still another object of the present invention is at least D
It is to provide a discrimination technology capable of discriminating between VD-RAM, DVD-R, and DVD-RW.

[0009]

In order to achieve the object of the present invention, in the first invention, when the objective lens of the optical pickup is swept over the optical disc, S detected in the sweep step of the objective lens is detected. The number of S-shaped focus error signals is counted, and the number of recording surface layers is determined from the number of S-shaped focus error signals to determine the number of optical disk layers.

According to a second aspect of the present invention, in the first aspect of the present invention, before sweeping the objective lens, it is determined that the disc is a DVD type disc and that the optical disc is chucked normally.

According to a third aspect of the present invention, it is determined that the disc is a DVD type disc, the DVD type disc is a single layer disc, and the first push-pull tracking is performed at a first predetermined radial position of the disc. An error signal is acquired, and a second push-pull tracking error signal is acquired at a second predetermined radial position that is larger than the first radial position.
If the amplitude of the push-pull tracking error signal is larger than the amplitude of the second push-pull tracking error signal, it is determined to be a DVD-RAM.

In a fourth invention, in the third invention, the control data is read, and the DVD-RAM1 or DVD-RAM2 is read from the disc type of the control data.
Determine whether.

According to a fifth aspect of the present invention, it is determined that the disc is a DVD disc, the DVD disc is a single-layer disc, and the first push-pull tracking is performed at a first predetermined radial position of the disc. An error signal is obtained, a second push-pull tracking error signal is obtained at a second predetermined radial position on the disc, the first and second push-pull tracking error signals are calculated, and the DVD is calculated from the calculation result. -Identify the R disc.

According to a sixth aspect of the present invention, in the fifth aspect, the control data is read, and the disc type of the control data is DVD-R3.9 or DVD-R4.
It is determined whether it is 7-A or DVD-R4.7-G.

According to a seventh aspect of the present invention, it is determined that the disc is a DVD disc, the DVD disc is a single-layer disc, and the first push-pull tracking is performed at a first predetermined radial position of the disc. An error signal is acquired, a second push-pull tracking error signal is acquired at a second predetermined radial position of the disc, and the sum of the amplitudes of the first and second push-pull tracking error signals is smaller than a predetermined value. If it is determined that the phase difference tracking error signal is obtained at a predetermined position of the disc, one of the first and second push-pull tracking error signal amplitudes is smaller than a predetermined value, and If the tracking error signal amplitude of the phase difference method is smaller than a predetermined value, it is determined to be DVD-RW or + RW.

According to an eighth invention, in the seventh invention, D
When discriminating between VD-RW1.1 and DVD-RW1.0, if there is an RPFI, it is discriminated based on the RPFI data, and if there is no RPFI and there is an RMD, then RMFI.
Determined by the data of D, and if there is no RMD, L
Judgment is made based on PP data.

According to a ninth aspect of the invention, it is determined that the disc is a DVD disc, the DVD disc is a single-layer disc, and the first push-pull tracking is performed at a first predetermined radial position of the disc. An error signal is acquired, a second push-pull tracking error signal is acquired at a second predetermined radial position of the disc, and the sum of the amplitudes of the first and second push-pull tracking error signals is smaller than a predetermined value. If it is determined that a phase difference tracking error signal is obtained at a predetermined position of the disc, one of the first and second push-pull tracking error signal amplitudes is greater than or equal to a predetermined value, and When it is determined that the amplitude of the tracking error signal of the phase difference method is equal to or larger than a predetermined value, it is determined to be DVD-ROM or DVD-RW.

According to a tenth invention, in the ninth invention,
The control data is read, and the DVD-ROM or DVD-RW is read according to the disc type of the control data.
1.1 is determined.

In the eleventh aspect, the objective lens of the optical pickup is swept over the optical disc at the first disc radial position to obtain the amplitude of the first S-shaped focus error signal, and the second disc is used. The objective lens of the optical pickup is swept with respect to the optical disc at a radial position to obtain the amplitude of the second S-shaped focus error signal, and the first and second S-shaped focus error signals are acquired. When the amplitude of the signal is smaller than the predetermined value, it is determined that the chucking is abnormal.

In the twelfth invention, the objective lens of the optical pickup is swept over the optical disc at the first disc radial position to obtain the amplitude of the first S-shaped focus error signal, and the second disc is read. The objective lens of the optical pickup is swept with respect to the optical disc at a radial position to obtain the amplitude of the second S-shaped focus error signal, and the amplitude of the first S-shaped focus error signal is obtained. If the difference from the amplitude of the second S-shaped focus error signal is larger than a predetermined value, it is determined that the chucking is abnormal.

In the thirteenth invention, after the objective lens of the optical pickup is made to start sweeping the optical disc at the first disc radial position, a predetermined position of the first S-shaped focus error signal is reached. The first time required for the measurement is measured, the sweep of the objective lens of the optical pickup with respect to the optical disc is started at the second disc radial position, and then the second S-shaped focus error signal is detected. The second time required to reach a predetermined position is measured, and when the difference between the first and second times is larger than a predetermined value, it is determined that the chucking is abnormal.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings using examples. FIG. 1 is a block diagram showing an embodiment of an optical disk device according to the present invention. The recordable optical disc 1 used in this embodiment is a CD-R, a CD-RW, a DVD-R, a DVD-R.
There are five types of disks, W and DVD-RAM. Needless to say, this optical disk device can also reproduce a read-only DVD-ROM or CD-ROM. This recording apparatus is provided with a spindle 2 for rotating the optical disc 1, an optical pickup 3 for irradiating the optical disc 1 with a laser beam for recording and reproducing information, and a reproduction signal input from the optical pickup to perform signal processing necessary for data generation. It is composed of a plurality of LSIs.

The reproduction signal is the RF front end 4, this R
It is composed of a digital signal processing circuit 5 for receiving the signal of the F front end 4 and extracting the data on the disk, and a microcomputer 6 for controlling these circuits. The RF front end 4 and the digital signal processing circuit 5 are normally LS
I. A servo system signal is generated by the RF front end 4 and is controlled by the digital signal processing circuit 5.

For signal control for recording, necessary information is sent from the digital signal processing circuit 5 to the laser diode driver 13 mounted on the optical pickup 3, and the laser diode driver 13 sends the first laser diode 11 and the second laser diode 11.
The laser diode 12 of FIG. The first laser diode 11 is used, for example, for an optical disc for CD, and the second laser diode 12 is used for an optical disc for DVD.

The waveform control of recording is performed in the laser diode driver 13 in this embodiment. The control signal necessary for the laser diode driver 13 is generated corresponding to each disk and format, and controls the laser diode driver 13. In addition to this, power control signals and the like are controlled by blocks corresponding to the respective disks.

The disc discrimination processing operation by the optical disc recording / reproducing apparatus according to the present invention will be described below with reference to a flowchart. FIG. 4 is a flow chart showing a schematic processing operation of the disc discriminating method according to the present invention. In the figure, in step 401, it is determined whether the optical disc is a DVD optical disc or a CD optical disc (hereinafter, the optical disc is simply referred to as a disc). In the case of a CD type disc, the CD type disc is discriminated in step 402. As a result of this determination, as shown in steps 403, 404, and 405, each of the CD-ROM, the CD-R, and the CD.
-I know if RW.

If it is determined in step 401 that the disc is a DVD disc, in step 406, the DVD
It is discriminated whether it is a layer disc, a dual layer disc, or a multi-layer disc having more layers. This allows step 40
As shown in Nos. 7 and 408, it can be seen whether the disc is a DVD-ROM single layer disc or a DVD-ROM dual layer disc. Among the single-layer discs, the other discs are DVD-R in step 411.
Whether AM, DVD-R, or DVD-RW is discriminated. In step 411, DVD-RAM1 and DVD-RAM2
Is discriminated, it is possible to know whether it is the DVD-RAM 1 or the DVD-RAM as shown in steps 412 and 413.

For a DVD-R disc, step 41
It is determined by 5. As a result, as shown in steps 415 to 418, respectively, DVD-R3.9 (DVD-R
version.1.0), DVD-R4.7-A (DVD
-R ver. 2.0 for Authorin
g), DVD-R 4.7G (DVD-R ver.
2.0 for General). DV
For D-RW and + RW discs, step 4
It is determined at 21. As a result, steps 422 and 423
, DVD-RW 1.0 (DVD-RW v
er. 1.0), DVD-RW 1.1 (DVD-RW
ver.1.1).

The processing operation of the disc discriminating method shown in FIG. 2 will be described in detail below. Further, in the present embodiment, it is determined whether or not chucking is normal at the time of disc determination, and the disc determination is performed when normal, so this point will also be described in detail. FIG. 3 is a flow chart for explaining the operation of discriminating between a CD optical disc and a DVD optical disc and disc disc type discrimination processing of the CD system. In step 501, the power of the apparatus is turned on and the optical pickup is moved to the rezero position of the optical disk, that is, the position of the optical disk radius r = 23.7 mm. However, at this point, the optical disc has not yet rotated.
Next, in step 502, the DVD laser is irradiated onto the optical disk, and the returned light is detected. In the case of a CD type optical disc, the return light is hardly detected and is below a predetermined value, and in the case of a DVD type optical disc, it is considerably large and larger than a predetermined value. If the return light is less than or equal to the predetermined value in step 502, it means that a CD disc or an optical disc is not mounted.

If it is determined in step 502 that a CD disc or disc is not loaded, step 5
At 03, the disc is irradiated with a laser for CD, and the return light is detected. In the case of a CD disc, return light of a predetermined value or more is detected, so in this case it is determined to be a CD disc. That is, the detected return light is input to the microcomputer and compared with the threshold value that is predetermined by the microcomputer.
If it is larger than the threshold value, it is determined to be a CD disc. If no return light is detected,
Since it is determined that the disc is not mounted, the disc is not mounted in step 504 (not re
ady) is determined. If it is determined in step 503 that the disc is a CD type disc, the sled is moved in step 505 so that the optical pickup has a disc radius r = 25 m.
Adjust so that it is in the m position. Next, step 506.
Then, the laser for CD is irradiated again and the focus error signal is detected. It is determined whether the amplitude of the detected focus error signal is equal to or larger than a predetermined value or smaller. If smaller than the predetermined value, it is determined in step 507 that the disc is not mounted (not ready).

On the other hand, if the returned light is equal to or more than the predetermined value in step 502 and it is determined that the disc is a DVD type disc,
Moving to step 510, the sled is moved to adjust the position of the optical pickup so that the radius is r = 25 mm. By irradiating the DVD laser while changing the position of the pickup, it is possible to see whether or not the disc is tilted. Next, in step 511, it is determined whether the chucking is sufficient. If it is determined that the chucking is OK in step 511, the disc is rotated, and in step 512, the disc is irradiated with the laser for DVD again, and if the returned light is equal to or more than the predetermined value, the disc is determined to be a DVD disc. If the return light is smaller than a predetermined value, it is determined that the disc is a CD disc.

When it is determined in step 511 that there is a chucking mistake, and when it is determined in step 512 that the disc is a CD type disc, in step 506, a laser for CD is irradiated,
If the return light is equal to or larger than the predetermined value, it is determined that the disc is a CD disc, and if it is smaller than the predetermined value, it is determined in step 507 that the disc is not mounted.

Next, at step 514, various data obtained so far are input to the microcomputer, and judgment is made as described later. If it is determined in step 514 that there is a chucking error, then in step 515 not ready
Becomes If the chucking is good in step 514, the laser for CD is applied to the disc to detect the amplitude of the focus error signal in step 516, and if the amplitude of the focus error signal is equal to or more than a predetermined value, CD
It is determined that the system disc is a light reflection disc, and the process proceeds to step 517. In step 517, it is determined whether or not wobble synchronization is being performed. That is, it is determined whether or not the wobble signal is detected. That is, when the wobble signal is detected, the clock signal is synchronized with the wobble signal in the PLL circuit. If the wobble signal cannot be detected at step 517, it is discriminated as a CD-ROM disc as shown at step 518. Step 517
If the wobble signal is detected, step 51
As shown in FIG. 9, it is discriminated as a CD-R disc. In step 516, if the amplitude of the focus error signal is smaller than the predetermined value, it means that the disc is a low reflection disk and is estimated as CD-RW.
Detect the wobble signal. When the wobble signal is detected, it is clear that the wobble synchronization is performed, and therefore it can be discriminated as a CD-RW disc in step 521.

Next, a method of determining whether the chucking is good or bad (mischucking) in steps 511 and 514 will be described. The disc capable of discriminating the chucking failure in this embodiment is, for example, a CD-RO as a CD system.
M, CDM-R, CD-RW (CD-MRW),
As a DVD system, DVD-RAM1 and DVD-RAM
2, DVD-ROM 1 layer, DVD-ROM 2 layer, DVD
-R3.95GB, DVD-R4.7GB, DVD-R
W, DVD- + RW 4.7 GB. Also, mischucking detection will be described separately for a device equipped with a mechanical tilt sensor and a device not equipped with it.

First, detection of mischucking in a device not equipped with a mechanical tilt sensor will be described with reference to FIGS. 4 and 5. FIG. 4 is a diagram showing focus error signals detected on the inner and outer circumference sides of the disc. First, when the optical pickup is moved to the re-zero position on the inner circumference side and focus sweep is performed, two focus error signals (hereinafter referred to as FE signals) are obtained. The first FE signal 601 is due to the reflection on the disk substrate surface. The second FE signal 602 is an FE signal obtained by reflection from the recording surface of the disc. Further, after moving the optical pickup in the outer peripheral direction of the disc, a focus sweep is performed, and the FE signal 603 reflected from the surface of the disc and the FE signal reflected from the recording surface of the disc.
A signal 604 is obtained. Now, let the maximum amplitude of the FE signal 602 be FE1 and the maximum amplitude of the FE signal 604 be FE2. Reference numeral 605 is a FOD (signal for driving an actuator for Focus Drive) curve. Furthermore, in this embodiment, the time t11, t between the S-shaped curves shown in the figure is
Mischucking is determined by acquiring 12, t21, and t22. t11 is the time between the focus sweep start point and the zero point of the FE signal 601, t21 is the time between the focus sweep start point and the zero point of the FE signal 603,
t12 is the time between the zero points of the FE signal 601 and the FE signal 602, and t22 is the time between the zero points of the FE signal 603 and the FE signal 604.

Conventionally, mischucking was detected only by the magnitude of the FE signal, but in this method, the disc recording surface is in focus and the FE signal amplitude is normal due to the tilted state of the disc during mischucking. A signal at a level comparable to that during chucking may be output, and mischucking could not be accurately detected. Therefore, in the present invention, the time between S-shaped curves is acquired.

When the disk is chucked normally, the time from the focus sweep start time to the time when the FE signal due to the reflection on the disk surface is observed is only about the fluctuation of the disk surface and the fluctuation of the sweep speed even if the measurement position is moved. It does not change. On the other hand, when the disc is mischucked, the disc is tilted, so that when the measurement position is moved, it becomes larger than the previous time. That is, t21 becomes larger than t11. Therefore, mischucking detection is performed using this time difference. Further, the FE signal amplitude is also used in order to cope with the case where the time detection is erroneous. In the mischucking state, the FE signal amplitude may be large, and the amplitude may be small. A mischucking state like this is determined. Some discs have a high wavelength dependency, and therefore, the mischucking state or the no-disc state is always measured after measurement with a DVD laser and a CD laser. The above measurement is based on the BCA area (21.9 mm to 23.55 m).
Perform at a position avoiding m). Therefore, the measurement on the inner circumference side is performed at a rezero position, and the measurement on the outer circumference side is performed at a position with a radius of 23.75 mm.

FIG. 5 is a flow chart showing an embodiment of the mischucking detection operation according to the present invention. First, in step 701, the times t11, t12 and FE1 between the S-shaped curves described with reference to FIG. 4 are measured. That is, for the focus sweep, the time from when the objective lens is started to move from a predetermined position to the center of the S-shaped focus error signal is measured. This time may be a time from when the movement of the objective lens is started from a predetermined position to a predetermined position of the S-shaped focus error signal. In step 702, the optical pickup is moved in the outer peripheral direction and adjusted so that the radius r = 23.75 mm. Then, in step 703, the time t21 between the S curves, t22,
Measure FE2. FE1 and FE2 in step 704
It is determined whether the value of is larger than a predetermined value FEd.
If the disc is mounted well, both FE1 and FE2 must be greater than a predetermined value. Therefore, when the values of FE1 and FE2 are equal to or smaller than the predetermined value FEd, the process proceeds to step 705, and it is determined that there is no medium or mischucking. When the values of FE1 and FE2 are larger than the predetermined value FEd (in the case of Y), in step 706, the absolute value of t11-t21 is the predetermined time tm.
Determine if less than. When the disc is properly mounted, the values of t11 and t21 are substantially the same, so the absolute value of t11-t21 is smaller than the predetermined time. Therefore, the absolute value of t11-t21 is equal to the predetermined time tm.
In the above case (in the case of N), the process proceeds to step 705, and it is determined that there is no medium or mischucking. When the absolute value of t11-t21 is smaller than the predetermined time tm in step 706, the process proceeds to step 707.
In step 707, it is determined whether the absolute value of FE1-FE2 is smaller than the predetermined value FEm. FE1-FE2
If the absolute value of is greater than or equal to the predetermined value FEm (N), it is determined in step 705 that there is no medium or mischucking. When it is determined in step 707 that the absolute value of FE1-FE2 is smaller than the predetermined value FEm, it is determined in step 708 that there is a medium. Thus, only when the values of FE1 and FE2 are larger than the predetermined value FEd, the absolute value of t11-t21 is smaller than the predetermined time tm, and the absolute value of FE1-FE2 is smaller than the predetermined value FEm. , It is determined that there is a medium.

Next, a mischucking detection method in an optical disk recording / reproducing apparatus equipped with a mechanical tilt sensor will be described. When the mechanical tilt sensor is provided, the degree of inclination of the disc and the presence / absence of the disc can be determined by calculating the signal from this sensor. A sum signal and a difference signal are generated from the output of the mechanical tilt sensor. If the two signals cannot be observed at the same time due to the circuit configuration, a switch is used to switch and the difference signal and the sum signal are calculated. Based on the result, the tilt of the disc, the presence or absence of the disc, and mischucking can be determined.

Next, referring to FIG. 6, a DVD disc,
In particular, DVD-ROM 1 layer, DVD-ROM 2 layer, DV
A method of discriminating D-RAM, DVD-R, DVD-RW will be described. FIG. 6 is a flow chart showing an embodiment of the processing operation for discriminating the type of a part of the DVD disc. Assuming that the output terminal is A when it is discriminated as a DVD disc in step 512 of FIG. 3, the flow of FIG. First, in step 801, the sled is moved to move the optical pickup to a disc radius r = 23.
Place at 7 mm. Next, in step 802, it is determined whether the DVD disc is a single layer or a double layer. Therefore, the focus is swept and the focus error signal S
Count the number of curved lines. If the recording surface is a single layer,
Two S-time curves are obtained, an S-time curve obtained from the reflection on the disc surface and an S-time curve obtained from the disc recording surface. In the case of a two-layer disc, an S-shaped curve is obtained from the disc surface, the first recording surface, and the second recording surface, respectively. Therefore, by counting the S-shaped focus error signal, It is possible to distinguish between a layer disc and a dual layer disc.

When it is determined in step 802 that the disc is a dual-layer disc, in step 803, the control data written in the disc lead-in area is read. Since the type of the disc is described in this control data, if the disc type is described as a DVD-ROM dual layer disc, the process proceeds to step 804 and it can be determined that the disc is a DVD-ROM dual layer disc. it can. In step 803, the control data is DVD-
If it is described as a ROM 1-layer disc, the S-curve count in step 802 is incorrect, so that the disc is determined as a DVD-ROM 1-layer disc as shown in step 805.

If it is determined in step 802 that the disc is a DVD type single layer disc, the process proceeds to step 808,
Electric offset adjustments for DVD-R and DVDs other than R are performed, and in step 809, electric offset adjustment values other than DVD-R are set. As the offset adjustment, for example, the zero point adjustment of the servo circuit and the initial value adjustment are performed by DVD
R, DVD discs other than that are performed. Next, in step 810, the amplitude of the push-pull tracking signal (referred to as PP signal) is acquired here.
Remember. Next, the step 81 thread is moved and the optical pickup is adjusted so that the radius r of the disc is 25 mm. Then, the amplitude of the PP signal is acquired and stored.

Next, the process proceeds to step 813, where r = 2.
PP signal amplitude at 3.7 mm (referred to as pp23.7)
And PP signal amplitude when r = 25 mm (referred to as pp25)
To compare. That is, the value of pp25 / pp23.7 is calculated. In a DVD-RAM, this is embossing when the radius is 24.0 mm or less and the PP signal is small, which is 24.0 mm.
The above has the characteristic that the PP signal is large due to the land / groove structure, but in the RW for DVD-R, since the PP signal is almost constant over the entire area, 24.0 m
The discs are easily discriminated by comparing the amplitudes of the PP signal before and after m. In this embodiment, the discriminant of pp25 / pp23.7> pp_r1 is used, and when pp25 / pp23.7 is larger than pp_r1, it is determined to be a DVD-RAM. As described above, in the case of RAM, pp25 / pp23.7 is sufficiently larger than 1, and when it is close to 1, it is determined as a disk other than that. In the present embodiment, as a result of the examination, pp_r
When 2 = 2, the erroneous discrimination is the smallest, so pp25 / p
It is determined whether p23.7 is greater than 2 or less than 2. Therefore, if pp25 / pp23.7 is larger than 2, it is determined to be a DVD-RAM in step 814, and the process proceeds to the step shown in another figure through the terminal B.

When pp25 / pp23.7 is 1 or less, the process proceeds to step 815 and (pp25 + pp2
3.7)> It is determined whether or not> pp_r2 is satisfied. p
p_r2 is a predetermined constant and is stored in the memory of the optical disc device. (Pp25 + pp23.
If 7) is larger than the constant pp_r2, DVD-R
Since it is determined that the DVD-R is the DVD-R in step 816, the electric offset adjustment value of the DVD-R is set in step 817, and the DVD-R is set in step 818.
To determine. After that, the terminal C is connected to the flowcharts of other figures.

In step 815, (pp25 + pp2
If 3.7) is smaller than the constant pp_r2, DVD
If the possibility other than -R is high, the process proceeds to step 821, where the phase difference detection signal (DPD) amplitude, which is a tracking error signal, is acquired. Then, step 822
, The amplitude of the DPD at r = 25 mm (dpd25
) And pp25 (push-pull tracking signal amplitude of r = 25 mm). Assuming that the predetermined amplitude value of DPD is dpd_present and the predetermined amplitude value of PP is pp_present, dpd25 <dpd_present and pp25 <pp_present are satisfied (in the case of Yes), DVD-RW, +
Since it is highly possible that the disc is an unrecorded RW disc, it is determined in step 823 that the disc is DVD-RW or + RW. However, DVD-ROM discs and DVD-Rs after recording
In the case of W and + RW discs, the above determination may not be satisfied (NO), so the process proceeds to step 824, and the AGC in the analog RF front end is performed.
Check the value of the setting register that sets the PE (Pull-in Error) gain of (Automatic Gain Control). The PE gain is set so as to reduce the gain when the reflectance of the disc is high. Therefore, if the value of the gain setting register is smaller than the predetermined value in step 824, the DVD-R in step 827.
It is determined that there is a possibility of OM, and the process proceeds to step 828. If the value is larger than the predetermined value, the reflectance is low and the possibility of DVD-RW or + RW is high as shown in step 825, but the ROM may be recognized due to dirt on the disk or the like. Of these, the disc 828 is the DVD
If it is determined that there is a possibility of −RW and + RW, in this case, in step 829, the PP amplitude is adjusted, and it is determined whether or not the adjustment was successful. If adjustment is possible, the terminal D is connected to another flowchart. If the amplitude cannot be adjusted in step 829 (No), the process proceeds to step 828.

In step 828, it is checked again whether the disc is a single-layer disc or a dual-layer disc.
The control data is read in step 803, and the DVD-ROM two layers in step 804 or D in step 805 is read.
It is determined to be the VD-ROM one layer. If the disc is a single-layer disc in step 828, the control data is read in step 830, and step 8
04 DVD-ROM dual layer or step 805 DVD
-It is determined to be the ROM1 layer.

Next, referring to FIG. 7, the DVD-R3.9,
A method of discriminating between DVD-R4.7-A and DVD-R4.7-G will be described. FIG. 7 is a flow chart showing an embodiment of the processing operation for discriminating some other types of DVD discs. When it is determined to be a DVD-R in step 818 of FIG. 6, the process moves from the terminal D to step 901,
The LPP (land pre-pit) is interpolated, that is, decremented, and the LPP is read. Next, in step 902, L
It is determined whether the PP data can be demodulated. If it can be demodulated (Yes), there is a high possibility of an unrecorded disc. Therefore, in step 903, it is determined whether the block address of PART A before interpolation is F00000 or more. If the block address is smaller than F00000 in step 903, the process moves to step 904 to read the control data. The fact that the LPP data cannot be demodulated in step 902 means that the S / N is bad or there is a high possibility of a recorded disc. Therefore, in step 906, seek with the data ID to optimize the servo signal. PP
After setting the signal, the control signal is read in step 904.

At step 903, PART A before interpolation
If the block address of F is above F00000 (Yes), the possibility of DVD-R4.7-G is high. In this case, further, in step 908, RMD (Recordi
ng ManagementData, DVD-
It is a part of the recording portion of R and DVD-RW. ) Is checked, and if there is no RMD, LP is performed in step 910.
Information of ID1 to ID5 is acquired from the P data, and control data is read in step 904. Step 90
If there is an RMD in step 8, the RM in step 912.
D is read, and in step 913, RPFI (R (R
W) Physical Format Infoma
is a part of the recording data of DVD-R and DVD-RW). Step 91
If there is no RPFI in step 3, the control data is read in step 904. RPFI in step 913
If yes, read RPFI. If the RPFI can be read, it can be determined as DVD-R4.7-G as shown in step 916.

If the reading is impossible in step 914,
As shown in step 918, the disc cannot be discriminated (no
t ready). As a result of reading this troll data in step 904, depending on the type of the read disk, as shown in step 910, the DVD
-R3.9 or DVD-R4.7-A as shown in step 922, step 91
6 DVD-R 4.7-G, or step 8
If it is discriminated as the DVD-RM1 layer of No. 05, or if the disc cannot be read, it is discriminated that the discrimination in step 918 is impossible.

Next, the DVD-RAM 1 and the DVD-RAM
2, a method for discriminating DVD-RW1.0 and DVD-RW1.1 will be described with reference to FIG. FIG. 8 is a flowchart showing an embodiment of a processing operation for discriminating still another type of DVD disc. Step 814 of FIG. 6 is connected to terminal B. The terminal B moves to step 1101 in FIG. If the disc is determined to be a DVD-RAM in step 814, the control data is read in step 1101 and the disc type described therein is checked to determine the DVD-RA as shown in step 1102.
M1 or D as shown in step 1103
It may be determined as VD-RAM2.

In FIG. 6, in step 823, the DVD-R
If it is determined to be W or + RW, and the PP amplitude can be adjusted in step 828, the terminal D is used to execute step 1 in FIG.
At 104, LPP data demodulation is performed. DVD + RW is L
Since it does not have a PP, it cannot demodulate.
In this case (No), the process proceeds to step 1106,
First, looking at the ID (address) in the data, seeking to the current position and setting the DPD level, the control data is read in step 1108.

Since the DVD-RW has the LPP, it can be demodulated. In this case (Yes), in step 1110, the LPP is decremented and the LPP is read. When reading is impossible, that is, in the case of a recorded disc, reading may not be possible. Therefore, in this case, the process proceeds to step 110, in order to read the physical information, seek is performed while checking the ID (address) in the recorded data and the PP
Set the (push-pull servo signal) level. For both steps 1110 and 1112, step 1114
Check for RMD. If there is no RMD, in step 1116, information of ID1 to ID5 of the disc is acquired. As a result, in the case of −RW1.1, the process moves to step 1108 and the control data is read. In the case of -RW1.0 in step 1116, it is discriminated as DVD-RW1.0 as shown in step 1118.

If RMD exists in step 1114, the RMD is read in step 1116, and step 1
Moving to 118. At step 1118, the presence or absence of RPFI is checked. If there is no RPFI, it is determined whether the DVD-RW1.1 or the DVD-RW1.0 based on the result of the RMD, and if it is -RW1.1, the control data is read in step 1108. R at step 1118
If there is a PFI, read the RPFI, step 1
As indicated by 120, the disc is determined to be DVD-RW1.1. In step 1108, by reading the control data and checking the disc type, the DVD-ROM
One layer, DVD-RW 1.1 or read-inhibited in step 918 is determined to be impossible.

As described above, according to the present invention, most of the CD type discs and the DVD type discs can be discriminated. That is, while discriminating between a CD disc and a DVD disc, a CD disc, CD-RW, CD-R,
CD-ROM can be discriminated, and for DVD discs, DVD-R3.9, DVD-R4.7, DVD-R
R4.7-G, DMD-ROM1 layer, DVD-ROM2
Layer, DVD-RAM1, DVD-RAM2, DVD-R
It is possible to discriminate between W1.0 and DVD-RW1.1. Further, in the present invention, disc mischucking or disc non-discrimination is discriminated during disc discrimination processing operation,
Only if the disc is successfully chucked
By discriminating the disc, the disc can be discriminated more accurately.

In particular, in the present invention, it is possible to discriminate between a single-layer disc and a multi-layer disc. Further, since it is determined whether chucking is normal or mischucking, and the disk is discriminated only when the chucking is normal, the disc can be discriminated more accurately. According to the present invention, for disc discrimination, by acquiring tracking error signals at different disc radii,
It has become possible to distinguish between RAM, DVD-R, and DVD-RW.

[0056]

As described above, according to the present invention, it is possible to discriminate between a single-layer disc and a multi-layer disc. Further, by discriminating whether the chucking is normal or mischucking and discriminating the disc only when the chucking is normal, the disc can be discriminated more accurately. In addition, by acquiring tracking error signals at different disc radii, DVD-RAM,
It is possible to discriminate between DVD-R and DVD-RW.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an optical disc recording / reproducing apparatus according to the present invention.

FIG. 2 is a flow chart showing a schematic processing operation of a disc discriminating method according to the present invention.

FIG. 3 is a flowchart for explaining a disc operation of discriminating between a CD optical disc and a DVD optical disc and disc disc type discrimination of a CD disc.

FIG. 4 is a diagram showing focus error signals detected on an inner peripheral side and an outer peripheral side of a disc.

FIG. 5 is a flowchart showing an embodiment of a mischucking detection operation according to the present invention.

FIG. 6 is a flowchart showing an example of a processing operation for determining the type of a part of a DVD disc.

FIG. 7 is a flowchart showing an example of a processing operation for discriminating some other types of DVD discs.

FIG. 8 is a flowchart showing an embodiment of a processing operation for discriminating still another type of DVD disc.

[Explanation of symbols]

1 ... Optical disc, 2 ... Spindle motor, 3 ... Optical pickup, 4 ... RF front end, 5 ... Reproduction signal processing circuit, 6 ... Microcomputer.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Tetsuya Fushimi             Stock Market, Toranomon 1-26-5, Minato-ku, Tokyo             Hitachi Hitachi LG Data Storage F-term (reference) 5D066 HA01                 5D090 AA01 BB02 BB03 BB04 CC18                       DD03 HH01 JJ00                 5D117 AA02 CC07 DD08 EE14 FF03                       FF14

Claims (26)

[Claims] 1. A step of sweeping an objective lens of an optical pickup onto an optical disc, a step of counting the number of S-shaped focus error signals detected in the sweep step of the objective lens, and a step of measuring the S-shaped focus error signal. And a step of determining the number of recording layers from the number of focus error signals. 2. The optical disc discriminating method according to claim 1, wherein a step of discriminating a DVD disc before sweeping the objective lens, and a step of discriminating that the chucking of the optical disc is normal. An optical disc discriminating method comprising: 3. A step of determining that the disc is a DVD type disc, a step of determining that the DVD type disc is a single-layer disc, and a first push-pull tracking at a first predetermined radial position of the disc. Obtaining an error signal, obtaining a second push-pull tracking error signal at a second predetermined radial position larger than the first radial position, and obtaining a second push-pull tracking error signal amplitude at the second 2 is larger than the push-pull tracking error signal amplitude, DVD-RA
A method for discriminating an optical disc, comprising: discriminating M. 4. The optical disc discriminating method according to claim 3, wherein the control data is read, and the DVD-RAM1 or DVD-R is discriminated from the disc type of the control data.
An optical disc discriminating method, characterized in that a step of discriminating whether it is AM2 is provided. 5. A step of determining that the disc is a DVD type disc, a step of determining that the DVD type disc is a single-layer disc, and a first push-pull tracking at a first predetermined radial position of the disc. Obtaining an error signal, obtaining a second push-pull tracking error signal at a second predetermined radial position on the disk, and calculating the first and second push-pull tracking error signals. And a step of discriminating a DVD-R disc from the calculation result. 6. The optical disc discriminating method according to claim 5, wherein the control data is read and the disc type of the control data is DVD-R3.9 or DVD-R.
An optical disc discriminating method comprising the step of discriminating between R4.7-A and DVD-R4.7-G. 7. A step of discriminating that the disc is a DVD type disc, a step of discriminating that the DVD type disc is a single layer disc, and a first push-pull tracking at a first predetermined radial position of the disc. The step of obtaining an error signal, the step of obtaining a second push-pull tracking error signal at a second predetermined radial position on the disk, and the sum of the first and second push-pull tracking error signal amplitudes is predetermined. If it is determined that the value is smaller than the value of, the step of obtaining a phase difference tracking error signal at a predetermined position of the disk, and one of the first and second push-pull tracking error signal amplitudes is larger than a predetermined value. If the tracking error signal amplitude of the phase difference method is smaller than a predetermined value, the DVD
An optical disc discriminating method comprising a step of discriminating between −RW and + RW. 8. The optical disc discriminating method according to claim 7, wherein when discriminating between DVD-RW1.1 and DVD-RW1.0, if there is an RPFI, the discriminating is carried out based on the RPFI data, and there is no RPFI. An optical disc discriminating method characterized in that when there is an RMD, discrimination is performed based on RMD data, and when there is no RMD, discrimination is performed based on LPP data. 9. A step of determining that the disk is a DVD type disk, a step of determining that the DVD type disk is a single-layer disk, and a first push-pull tracking at a first predetermined radial position of the disk. The step of obtaining an error signal, the step of obtaining a second push-pull tracking error signal at a second predetermined radial position on the disk, and the sum of the first and second push-pull tracking error signal amplitudes is predetermined. If it is determined that the value is smaller than the value of, the step of obtaining a phase difference tracking error signal at a predetermined position of the disk, and one of the first and second push-pull tracking error signal amplitudes is larger than a predetermined value. If it is determined that the amplitude of the tracking error signal of the phase difference method is equal to or greater than a predetermined value, the DVD ROM, or optical disc discriminating method characterized by comprising the steps of determining a DVD-RW. 10. The optical disc discriminating method according to claim 9, wherein the control data is read and the disc type of the control data is DVD-ROM or DVD-ROM.
An optical disc discriminating method, characterized by comprising a step of discriminating whether RW1.1. 11. An objective lens of an optical pickup is swept over an optical disc at a first disc radial position,
A step of acquiring the amplitude of the first S-shaped focus error signal, and a step of sweeping the objective lens of the optical pickup with respect to the optical disc at a second disc radial position to obtain a second S-shaped focus And a step of determining that chucking is abnormal when the amplitudes of the first and second S-shaped focus error signals are smaller than a predetermined value. A method for determining a chucking abnormality. 12. An objective lens of an optical pickup is swept with respect to an optical disc at a first disc radial position,
A step of acquiring the amplitude of the first S-shaped focus error signal, and a step of sweeping the objective lens of the optical pickup with respect to the optical disc at a second disc radial position to obtain a second S-shaped focus A step of acquiring the amplitude of the error signal; and chucking when the difference between the amplitude of the first S-shaped focus error signal and the amplitude of the second S-shaped focus error signal is larger than a predetermined value. Is determined to be abnormal, and a chucking abnormality determining method is provided. 13. The method required from the start of sweeping of the objective lens of the optical pickup onto the optical disk at the first disk radial position to the predetermined position of the first S-shaped focus error signal. The step of measuring the time of 1 and starting the sweep of the objective lens of the optical pickup with respect to the optical disc at the second disc radial position, and then deciding the second S-shaped focus error signal in advance. A step of measuring a second time required to reach the predetermined position, and a step of determining that the chucking is abnormal when the difference between the first and the second times is larger than a predetermined value. A method for determining a chucking abnormality. 14. A means for counting the number of S-shaped focus error signals obtained when an objective lens of an optical pickup is moved from a predetermined position to another predetermined position with respect to an optical disk, and the S-shaped shape. And a means for discriminating the number of layers of the recording surface from the number of the focus error signals. 15. The optical disc apparatus according to claim 14, further comprising means for discriminating that the disc is a DVD type disc and means for discriminating that chucking of the optical disc is normal. apparatus. 16. A means for discriminating that the loaded optical disc is a DVD disc, a means for discriminating that the DVD disc is a single-layer disc, and a first discriminating position at a first predetermined radius position of the optical disc. Means for obtaining a first push-pull tracking error signal amplitude and a second push-pull tracking error signal amplitude at a second predetermined radial position larger than the first radial position; D if the signal amplitude is greater than the second push-pull tracking error signal amplitude
An optical disk device, comprising: a means for discriminating a VD-RAM. 17. The optical disc discriminating method according to claim 16, wherein the control data is read, and the disc type of the control data is DVD-RAM1 or DVD.
An optical disk device characterized in that it is provided with means for determining whether it is RAM2. 18. A unit for determining that the loaded optical disc is a DVD disc, a unit for discriminating that the DVD disc is a single-layer disc, and a means for discriminating the optical disc at a first predetermined radial position of the optical disc. Means for obtaining a push-pull tracking error signal of No. 1 and a second optical disc of the optical disc.
A means for acquiring a second push-pull tracking error signal at a predetermined radial position, and the first and second push-pull tracking error signals are calculated, and it is determined from the calculation result that the disc is a DVD-R disc. An optical disk device comprising: 19. The optical disk device according to claim 18, wherein the control data is read and the disk type of the control data is DVD-R3.9 or DVD-R.
An optical disc device comprising means for discriminating between R4.7-A and DVD-R4.7-G. 20. A means for discriminating that the loaded optical disc is a DVD disc, a means for discriminating that the DVD disc is a single-layer disc, and a disc at a first predetermined radial position of the optical disc. Means for acquiring the first push-pull tracking error signal amplitude and acquiring the second push-pull tracking error signal amplitude at the second predetermined radial position of the optical disk; and the first and second push-pull tracking error signals. A means for acquiring a tracking error signal of a phase difference method at a predetermined position of the disk when it is determined that the sum of the amplitudes is smaller than a predetermined value, and the first and second push-pull tracking error signal amplitudes. If one is smaller than a predetermined value and the tracking error signal amplitude of the phase difference method is smaller than a predetermined value, a DVD-RW, Optical disk apparatus characterized by comprising a means for discriminating the RW. 21. In the optical disk device according to claim 20, when discriminating between DVD-RW1.1 and DVD-RW1.0, if there is an RPFI, the discrimination is made based on RPFI data, and there is no RPFI. An optical disk device is provided with means for making a determination based on the RMD data when there is any, and making a determination based on the LPP data when there is no RMD. 22. A means for discriminating that the loaded optical disc is a DVD disc, a means for discriminating that the DVD disc is a single-layer disc, and a disc at a first predetermined radial position of the disc. Means for obtaining a first push-pull tracking error signal, means for obtaining a second push-pull tracking error signal at a second predetermined radial position of the disc, and the first and second push-pull tracking error signals A means for acquiring a tracking error signal of a phase difference method at a predetermined position on the disk when it is determined that the sum of the amplitudes is smaller than the predetermined value;
And one of the second push-pull tracking error signal amplitudes is greater than or equal to a predetermined value and the tracking error signal amplitude of the phase difference method is greater than or equal to a predetermined value, a DVD-ROM, or An optical disc discriminating method comprising: a unit for discriminating a DVD-RW. 23. The optical disk device according to claim 22, wherein the control data is read, and the disk type of the control data is DVD-ROM or DVD-R.
An optical disk device, characterized in that it is provided with means for determining whether it is W1.1. 24. A means for sweeping an objective lens of an optical pickup with respect to an optical disc at a first disc radial position of the mounted optical disc to obtain an amplitude of a first S-shaped focus error signal; A means for sweeping the objective lens of the optical pickup with respect to the optical disc at a disc radial position of 2 to obtain the amplitude of a second S-shaped focus error signal, and the first and second S
An optical disk device, comprising: means for determining that chucking is abnormal when the amplitude of the character-shaped focus error signal is smaller than a predetermined value. 25. A means for sweeping an objective lens of an optical pickup with respect to an optical disc at a first disc radial position of the mounted optical disc to obtain an amplitude of a first S-shaped focus error signal; A means for sweeping the objective lens of the optical pickup with respect to the optical disc at a disc radial position of 2 to obtain the amplitude of the second S-shaped focus error signal; and the first S-shaped focus. An optical disc apparatus comprising: a unit that determines that chucking is abnormal when the difference between the amplitude of the error signal and the amplitude of the second S-shaped focus error signal is larger than a predetermined value. 26. A predetermined position of the first S-shaped focus error signal after starting the sweep of the objective lens of the optical pickup with respect to the optical disc at the first disc radial position of the loaded optical disc. And a second S-shaped focus error after starting the sweep of the objective lens of the optical pickup with respect to the optical disc at the second disc radial position. The second required up to the predetermined position of the signal
The optical disc device comprising means for measuring the time, and means for determining that the chucking is abnormal when the first and second time differences are larger than a predetermined value.