JP2000306246A - Optical disk recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain recording/reproducing with an optimum condition in accordance with the state of an inserted optical disk in a recording/reproducing device adaptable to a plurality of types of optical disks. SOLUTION: An optical disk recording/reproducing device 1 is provided with a spindle driving circuit 100 capable of changing the double speed stepwise to rotate the optical disk 10. An optical pickup 30 is provided with a plurality of optical systems and adapted to the different types of optical disks 10. When the optical disk 10 is inserted, the set-up process is carried out to set the rotation to an optimum speed in accordance with the eccentricity, etc., of the disk. In the access process following the set-up process, when the control system for focusing, tracking, etc., are disordered or the reproducing process is abnormally finished, the process is made so as normally to be completed by changing the performance of an equalizer of the reproduced signal or the rotating speed of the optical disk.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk recording / reproducing apparatus for reading out recorded information from an optical disk having information recorded on a disk-shaped recording medium and recording the information on the optical disk, and more particularly to such an optical disk recording / reproducing apparatus. The present invention relates to an optical disk recording / reproducing apparatus capable of determining the state and type of an inserted disk in such an optical disk recording / reproducing apparatus.

[0002]

2. Description of the Related Art Conventionally, an optical disk recording / reproducing apparatus for optically reading and reproducing the recorded information from an optical disk which is an optical information recording medium on which information is recorded by forming pits or the like on a disk-shaped disk is known. For example, various types such as a CD are known and have already been put to practical use. Also, in recent years, as an optical recording medium capable of recording a large amount of information by increasing its information recording density, for example, a so-called DVD (digital video disc) has been proposed and attracted attention. Playback devices for playing back music are already commercially available.

[0003] Such DVDs and CDs include, for example,
A recording medium (DVD-R capable of only reproducing recorded information)
OM, CD-ROM) and recording media (DVD-R, CD-R) capable of recording once, and various recording media (DVD-RAM, CD-RW) capable of recording multiple times. Has been proposed. Note that these various recording media have different characteristics, particularly in terms of their reflectance and the like.

[0004]

As described above, the various types of recording media described above have become widespread. With this, recorded information is reproduced from such recording media, or
An optical disk recording / reproducing apparatus for recording information is required to exhibit optimal information recording / reproducing functions even for these various recording media.

[0005] CDs and DVDs are mounted on a disk drive and read or written. However, errors such as inability to read due to eccentricity of the disk or eccentricity of the disk occur.

According to the present invention, "Ready Lam" indicating completion of preparation after inserting an optical disk into a drive device is provided.
It is an object of the present invention to provide an optical disc recording / reproducing apparatus for improving a setup process and an access process for moving an optical pickup to a target position on an optical disc until "p" is lit.

[0007]

An optical disk recording / reproducing apparatus according to the present invention comprises, as basic means, a rotation driving apparatus for an optical disk and a plurality of types of laser optical systems having different wavelengths. An optical pickup for performing the operation and a microcomputer including drive control are provided. The setup process executed immediately after the optical disk is inserted includes a step of determining the type of the inserted optical disk, a step of pulling in the focus, a step of detecting the amount of eccentricity of the optical disk, and a step of The method includes a step of setting a maximum rotation speed and a step of pulling in tracking.

The access processing executed after the setup processing includes a step of setting the disk rotation speed to the maximum rotation speed of the disk set in the setup processing;
A step of detecting out-of-focus and out-of-tracking; a step of detecting whether the address can be reproduced; and a step of detecting whether the optical pickup has reached the target address. If the target address has not been reached, the equalizer characteristics are changed to each stage, a retry is performed, and even if the retry process is performed, the focus is lost,
In the case where the tracking is lost, the address cannot be reproduced, and the target address has not been reached, a step of performing a re-zero process is provided.

The means for changing the equalizer characteristics at each stage is means for reducing the double speed after increasing the equalizer boost amount, or means for reducing the double speed after changing the equalizer cutoff frequency, or This is a means for changing the equalizer cutoff frequency after increasing the equalizer boost amount, and thereafter reducing the double speed.

[0010] The rezeroing process includes a step of moving the optical pickup to the innermost circumference with respect to the optical disk, a step of pulling in the focus, a step of adjusting the amplitude of the focus, and a step of switching a plurality of objective lenses having different lens diameters. It is provided.

[0011]

FIG. 1 is a block diagram of a control system of an optical disk recording / reproducing apparatus according to the present invention, FIG. 2 is a plan view of an optical pickup section, and FIG. Code 1 for the whole
The optical disk recording / reproducing apparatus indicated by has a turntable 24 on which the optical disk 10 is placed.
Is driven by the spindle 22 of the servomotor 20. The optical pickup 30 provided to face the optical disk 10 reads information from the optical disk 10 or writes information to the optical disk 10.

The drive microcomputer 100 controls the number of revolutions of the servo motor 20 stepwise through a spindle rotation control circuit 110 and a drive circuit 120. The number of rotations is set in three stages, for example, 20 times speed, 16 times speed, 10 times speed, and the like.

The drive microcomputer 100 controls the current supplied to the semiconductor laser via the laser drive circuit 130 to control the light emission intensity. The information recorded on the optical disk 10 is detected by the optical pickup 30 and converted into an electric signal.
It is input to the reproduction signal processing circuit 150 and the control signal processing circuit 160. Here, the optical pickup 30 has, for example, two types of semiconductor lasers having different wavelengths and two types of objective lenses having different lens diameters.
In the case of (1), a semiconductor laser having a wavelength corresponding to this (for example, a wavelength of 650 nm) is emitted, and is switched to a corresponding objective lens. In the case of a CD, a semiconductor laser (for example, a wavelength of 780 nm) having a wavelength corresponding to the light is emitted, and the objective lens is switched to a corresponding one. The reproduction signal processing circuit 150 reads the optical pickup 3
0 to process the reproduction signal obtained and reproduce images and sounds.

The focus error signal generated by the control signal processing circuit 160 is input to a focus actuator drive circuit 172 via a focus control circuit 170,
By driving the focus actuator, focus control for focusing the laser beam on the optical disk 10 is performed. The tracking error signal generated by the control signal processing circuit 160 is
0 and input to the feed motor control circuit 190. The output of the tracking control circuit 180 is supplied to the tracking actuator via the tracking actuator driving circuit 182, and performs tracking control for causing the laser light to follow the track. The output of the feed motor 190 is supplied to the feed motor via a feed motor drive circuit 192, and performs access control for moving the laser beam onto a desired track.

In FIG. 2 and FIG.
Has an objective lens holding member 34 for holding a first objective lens 31 and a second objective lens 32. The objective lens holding member 34 is swingably supported about a swing shaft 35, and is swung by an actuator 36. The objective lenses 31 and 32 are switched by the actuator 36. The first lens 31 is, for example, an objective lens corresponding to DVD, and the second lens is an objective lens corresponding to CD.

The optical disk recording / reproducing apparatus of the present invention irradiates the inserted optical disk 10 with laser light having a wavelength of, for example, 780 nm by using, for example, the second objective lens 32, and then irradiates the first objective lens 31. And a function of automatically determining whether the inserted optical disk 10 is a DVD or a CD by irradiating a laser beam having a wavelength of 650 nm using a signal, and using a signal detected by each laser beam. I have.

FIG. 4 is a diagram showing a processing procedure from insertion of an optical disk to reproduction of information recorded on the optical disk in the optical disk recording / reproducing apparatus of the present invention.
First, a setup process (step S10) for determining the type of the inserted optical disc, detecting the amount of eccentricity, performing various adjustments, learning, and the like is performed. When reproducing information from the optical disk, the laser beam is moved to a desired reproduction position in the access processing (step S20), and then the information is reproduced in the reproduction processing (step S30).

FIG. 5 shows a setup process (step S1).
It is a flowchart which shows the procedure of 0). In the setup process started in step S100, the disk rotation speed is set in step S101. The rotation speed of the disk is set to a minimum speed (for example, 10 times speed) for the time being because the state of the disk has not been determined, and the optical disk rotates at this minimum speed until the setup is completed.

After rotating the optical disk in step S102, the type of the optical disk is determined in step S103. The type of the optical disc is determined by irradiating the optical disc with a laser beam having a wavelength for CD reproduction by using an objective lens for CD reproduction, and then by using an objective lens for DVD reproduction,
The determination can be made by irradiating a laser beam having a wavelength for VD reproduction and using a signal detected by each laser beam.

When the type of the disc is determined, the objective lens is switched to an objective lens corresponding to the inserted optical disc, and after a laser beam is irradiated, a focus pull-in process is performed in step S104. When the focus is pulled in, a tracking error signal is detected.
In, for example, the amount of eccentricity of the optical disk is detected by counting the number of zero crossings of the tracking error signal for a certain period of time. In step S106, the optical disc eccentricity detected in step S105 is compared with a preset installation value. If the optical disc eccentricity detected in step S105 is larger than the set value (Yes), , The speed at which the maximum rotation speed of the optical disc can be reproduced in step S108, that is, the maximum rotation speed of the device (for example, 20
Rotation speed (for example, 16 times speed).

On the other hand, if the optical disk eccentricity detected in step S105 is smaller than the set value (No), the maximum rotation speed of the optical disk is set to the maximum rotation speed of the apparatus (for example, 20 times speed). . Next, step S
After the tracking pull-in process is performed in 107, various adjustments and learning processes are performed in step S109, and the setup process ends.

FIG. 6 is a flowchart showing the procedure of the access processing S20. In the access process, the status of the control system such as focus and tracking, and whether the reproduction process is operating normally are monitored. If an abnormality occurs, the retry is performed by changing the setting conditions of the reproduction signal process and the control system. Like that.

First, in the access processing, it is detected whether or not the focus and tracking have been lost. If the focus or tracking has been lost, processing such as changing the equalizer characteristic of the reproduction signal or reducing the rotation speed of the optical disk is performed. Is performed, and focus or tracking pull-in is performed again. This is performed in order to prevent the focus and tracking from becoming unstable and making reproduction impossible, for example, when the surface of the optical disk is scratched or dusty or when the amount of eccentricity of the optical disk is large. is there. In particular, it is difficult to detect the amount of eccentricity of the optical disk, and if the amount of eccentricity is large, the vibration of the apparatus becomes large, and tracking may be lost. For this reason, when tracking deviation is detected, the rotation speed of the optical disk is reduced. When the amplitude of the reproduction signal is small or the noise is large, the address cannot be reproduced in some cases. Therefore, the equalizer characteristics are changed. If playback is still not possible, the rotation speed of the optical disk is reduced. Further, even when the laser beam cannot be positioned at the target address, the laser beam is moved again to the target address while changing the equalizer characteristics and gradually decreasing the rotation speed of the optical disk.

The procedure of the access process will be described below with reference to FIG. First, a description will be given of the state of the control system and the processing procedure when the reproduction processing is operating normally. Step S
In the process started in 200, the rotation speed of the optical disc is set in step S201. The rotation speed set here is the maximum rotation speed set by the eccentric amount of the optical disk in the setup process S10 (for example, 20 times speed or 16 times).
If the re-zero process described later is performed, the minimum speed (for example, 10 times speed) is set, and the optical disk rotates at the set speed.

In step S202, it is detected whether or not out-of-focus has occurred. As a result of the out-of-focus determination in step S203, if out-of-focus has not been detected (No), then in step S204, out-of-focus has occurred. Is not detected. Step S20
As a result of the tracking-off determination in 5, if tracking-off is not detected (No), the process proceeds to the next processing. In step S206, whether or not the address can be reproduced is checked. If the address can be reproduced (Yes), it is checked in step S207 whether the reproduced address is the target address, and if it is confirmed that the address is the target address (Yes).
In step S208, the access processing ends, and the flow advances to the next reproduction processing S30.

Next, a processing procedure when an abnormality occurs in the control system or the reproduction processing will be described. First, a processing procedure when the focus and tracking are lost or the address cannot be reproduced will be described. As a result of the out-of-focus determination in step S203, when out-of-focus is detected (Y
In step es), the process proceeds to step S212 to determine whether the equalizer characteristic has been changed to the final set value. If the equalizer characteristic has not been changed to the final set value (No), the process proceeds to step S220 to change the equalizer characteristic. After the change of the equalizer characteristics, the out-of-focus determination is performed again in step S221. If the out-of-focus is not detected (No), the process proceeds to step S223 to perform the out-of-track determination.

On the other hand, if the out-of-focus state is detected in step S221 (Yes), after re-focusing is performed in step S222, step S223 is performed.
To perform tracking off determination. Step S223
As a result of the tracking error determination, if the tracking error is not detected (No), the process returns to step S202 to detect the focus error. On the other hand, if tracking deviation has been detected in step S223 (Yes),
After the tracking pull-in is performed again in step S224, the process returns to step S202 to detect out-of-focus.

In the case where the tracking error is detected as a result of the tracking error determination in step S205 (Yes).
Then, the process proceeds to step S210, and it is determined whether the tracking pull-in has been performed again. If tracking re-pulling has not been performed (No), the process proceeds to step S211 to perform tracking re-pulling without changing the equalizer characteristics or the rotation speed of the optical disk, and returns to step S202 to detect out-of-focus. On the other hand, if it is determined in step S210 that the tracking pull-in has been performed again (Yes), the process proceeds to step S212, and if the equalizer characteristics have not been changed to the final set value (No), the processing is performed in the same manner as when the focus is lost. Is continued.

If the address cannot be reproduced in step S206, the process proceeds to step S212, and if the equalizer characteristic has not been changed to the final set value (No), the process is continued in the same manner as the process at the time of defocusing.

When the equalizer characteristics are tried to the final set value, the equalizer characteristics are changed again while the rotational speed of the optical disk is further reduced stepwise. That is, if it is determined in step S212 that the characteristics of the equalizer have been changed to the final set value (Yes), the process advances to step S213 to determine whether the optical disk rotation speed has been reduced to the minimum speed (for example, 10 times speed). . If it is determined that the speed has not yet been lowered to the minimum speed (No), the process proceeds to step S220, where the optical disk rotation speed is reduced by one step (for example, from 20 × to 16 ×) and the equalizer characteristics are changed.

On the other hand, if it is determined that the speed has been reduced to the minimum speed (Yes), it is determined in step S214 whether or not the tracking pull-in has been performed again.
In step S214 and step S215, if it is determined that the tracking and focus redrawing have not been performed (No), the process proceeds to step S221 and the subsequent redrawing is performed. . On the other hand, when it is determined in steps S214 and S215 that tracking and refocusing have been performed (Yes), focus or tracking is not stabilized even if all the change processing is performed, and the address cannot be reproduced. If so,
In order to restart the access processing from the beginning, the optical pickup is moved to the inner circumference of the optical disk again in step S21.
6 is performed.

Next, a processing procedure when the optical pickup cannot be positioned at the target address will be described. In step S207, it is determined whether the optical pickup has reached the target address. If the optical pickup is located at an address different from the target address (No), processing for moving the optical pickup is performed again.

In step S230, it is determined whether the optical pickup moving process has been performed up to a set number of times. If it is determined that the moving process has not been performed up to the set number of times (No), the optical pickup moving process is performed in step S240. The processing is performed and the processing is repeated up to the set number of times. On the other hand, step S23
If it is determined that the movement process has been performed up to the set number of times at 0 (Yes), the movement process is repeated while lowering the optical disc rotation speed and changing the equalizer characteristics.

In step S231, it is determined whether or not the equalizer characteristic has been changed to the final set value. If it has not been changed to the final set value (No), the flow advances to step S234 to move the optical pickup while changing the set value of the equalizer characteristic. . Here, the equalizer characteristic holds the set value of the characteristic changed when the focus or tracking is lost in the previous stage and when the address cannot be reproduced,
When changing the characteristics, the following setting values are used.

On the other hand, it is determined in step S231 that the characteristics of the equalizer have been changed to the final set value (Ye).
In the case of s), the process proceeds to step S232, and it is determined whether the rotation speed of the optical disk has been reduced to the minimum speed (for example, 10 times speed). If it is determined that the speed has not yet been lowered to the minimum speed (NO), the flow advances to step S234 to lower the optical disk rotation speed by one step (for example, from 20 × to 16 ×) and to move the optical pickup while changing the equalizer characteristics. . Here, the rotation speed of the optical disk is reduced when the focus or tracking is lost in the previous stage and when the address cannot be reproduced, and when the rotation speed is changed, the rotation speed is further reduced. On the other hand, if it is determined that the speed has been reduced to the minimum speed (Yes), the optical pickup cannot be positioned at the target address even if all the change processes are performed, and the optical process is performed again to restart the accelerator process from the beginning. The re-zero processing of step S233 for moving the pickup to the innermost circumference of the optical disk is performed.

The following describes the equalizer characteristics of the reproduced signal and the rotation speed of the optical disk, which are performed when an error occurs, such as when the focus or tracking is lost, the address cannot be reproduced, or the optical pickup cannot be positioned at the target address. The method of changing is described.

FIG. 7 is an explanatory diagram showing a method of setting the equalizer characteristics. 7A shows a method of changing the equalizer boost amount, FIG. 7B shows a method of changing the equalizer cutoff frequency, and FIG. 7C shows a method of changing the equalizer boost amount and the cutoff frequency. First, FIG.
The method (A) will be described. Generally, the equalizer characteristic is set so as to increase the boost amount near the highest frequency of the reproduction signal, and thus the cutoff frequency is changed in proportion to the rotation speed of the optical disk. That is, FIG.
As shown in FIG. 7, for example, when the optical disk is rotated at 20 times speed, the characteristic is set so that the boost amount becomes maximum at the cutoff frequency f1, and when the optical disk is rotated at 10 times speed, the cutoff frequency f1 is set. / 2 sets the characteristic to maximize the boost amount.

The change of the equalizer characteristics and the rotation speed of the optical disk are first set to the characteristics at the time of high rotation (for example, 20 times speed) as shown by the curve E1 in the initial setting, and the equalizer is changed without changing the rotation speed of the optical disk. Only the boost amount is sequentially increased until the curve E3 is reached. If the above abnormality occurs even when the boost amount is increased, the optical disk rotation speed is reduced (for example, 10 times speed), and the equalizer is changed to the characteristic shown in the curve E4, and only the equalizer boost amount is curved. Increase sequentially until it reaches E6.

In the method shown in FIG. 7B, the characteristics at the time of high rotation as shown by the curve E1 are set in the initial setting, and only the equalizer cut-off frequency is changed to the curve E0 and the curve without changing the optical disk rotation speed. Change as shown in E2.
If the above-described abnormality occurs even after the cutoff frequency is changed, the optical disk rotation speed is reduced and the equalizer is changed to the characteristic shown in the curve E3.

In the method shown in FIG. 7C, the characteristics at the time of high rotation as shown in the curve E1 are set in the initial setting, and only the equalizer boost amount is changed without changing the optical disk rotation speed as in the curve E2. change. If the above abnormalities occur even if the boost amount is increased, the optical disk rotation speed and the equalizer cutoff frequency are reduced to reduce the curve E
The characteristics are changed as shown in FIG. If an abnormality occurs even after the above change, the equalizer characteristics and the disk rotation speed are sequentially changed until the curve E6 is obtained.

Regardless of which method is adopted, if the equalizer characteristics have not reached the final value in steps S212 and S231 shown in FIG.
If the optical disk rotation speed has not reached the minimum speed in steps 213 and S232, the setting of the equalizer and the rotation speed of the optical disk are continuously changed in steps S220 and S234.

The rezeroing process performed when an abnormality occurs even after performing all the changing processes will be described below. FIG. 8 is a flowchart showing the rezero processing. Step S30
In the process started at 0, it is determined in step S301 whether or not focus redrawing has been performed. If the focus redrawing has not been performed (No), the process proceeds to step S302, where focus refocusing is performed. If it is determined (Yes), the process proceeds to step S304 to perform a pull-in process such as tracking, and returns to step S20 again to perform an access process.

If it is determined in step S301 that the focus pull-in has been performed again (Yes), and if the focus pull-in has ended abnormally in step S303 (N
In step o), the process proceeds to step S310, and rezero processing for moving the optical pickup to the innermost position with respect to the optical disk is performed. After moving the optical pickup to the innermost position,
In step S311, the amplitude of the focus error signal is adjusted while performing the focus sweep operation. Further, in step S312, the focus is redrawn, and in step S31
If it is determined in Step 3 that the focus pull-in process has been completed normally (Yes), Step S304 is performed and the access process is performed again.

On the other hand, if it is determined in step S313 that the focus pull-in has abnormally ended (No),
The objective lens corresponding to the type (DVD or CD) of the optical disc being reproduced is switched again. this is,
Since two types of lenses with different lens diameters are mounted on the optical pickup, the objective lens is switched to an objective lens different from the objective lens corresponding to the type of the optical disc being reproduced due to external vibration or disturbance. This is a process to be performed because the focus may not be retracted. In step S314, it is determined whether or not the lens re-switching process has been performed three times.
In step 15, the tracking actuator is driven to switch the objective lens again, and the process returns to step S310 to continue the subsequent processing. If the focus pull-in process ends abnormally even after repeating the objective lens switching process three times (Yes in step S314), the process proceeds to step S316, where it is determined that the access process has ended abnormally, and the process is stopped. Note that the number of times of re-switching the objective lens can be set arbitrarily.

[0045]

As described above, according to the present invention, information can be read as much as possible according to the state of the inserted optical disk, and the case of error processing can be reduced as much as possible. Therefore, it is possible to provide an optical disk recording / reproducing apparatus which is easy for the user to use.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of an optical disk recording / reproducing apparatus according to the present invention.

FIG. 2 is an explanatory diagram of a main part of the optical disk recording / reproducing apparatus of the present invention.

FIG. 3 is an explanatory diagram of a main part of the optical disk recording / reproducing device of the present invention.

FIG. 4 is a flowchart of processing of the optical disk recording / reproducing apparatus of the present invention.

FIG. 5 is a flowchart of processing of the optical disk recording / reproducing apparatus of the present invention.

FIG. 6 is a flowchart of processing of the optical disk recording / reproducing apparatus of the present invention.

FIG. 7 is an explanatory diagram showing a processing method of the optical disc recording / reproducing apparatus of the present invention.

FIG. 8 is a flowchart of processing of the optical disk recording / reproducing apparatus of the present invention.

[Description of Signs] 1 Optical disk recording / reproducing device 10 Optical disk 20 Drive motor 22 Spindle 30 Optical pickup 31 First objective lens 32 Second objective lens 100 Drive microcomputer 110 Spindle rotation control circuit 140 Current / voltage conversion circuit 150 Playback signal processing Circuit 160 Control signal processing circuit 170 Focus control circuit 180 Tracking control circuit 190 Feed motor control circuit

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toru Kawashima 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside Hitachi Image Information System Co., Ltd. (72) Yoshio Suzuki 1410 Inada, Hitachinaka-shi, Ibaraki Hitachi, Ltd. F-term (reference) 5D066 AA03 CA13 CA14 DA12 GA08 SA07 SB01 SB11 SC04 SE06 SE07 5D117 AA02 BB04 CC01 CC04 DD13 EE05 EE28 FF07 FF19 5D118 AA13 AA26 AA28 BA01 BB02 BF02 CD12 CD03 CD03

Claims (6)

[Claims] An optical pickup having a rotation driving device for an optical disc, a plurality of types of laser optical systems having different wavelengths, a plurality of objective lenses having different lens diameters, for recording and reproducing information on and from the optical disc, and controlling the drive. An optical disc recording / reproducing apparatus provided with a microcomputer including: a setup process executed immediately after an optical disc is inserted; a step of determining a type of the inserted optical disc, a step of pulling focus, and detecting an eccentricity of the optical disc. An optical disk recording / reproducing apparatus, comprising: a step of setting a maximum rotation speed of an optical disk corresponding to an eccentric amount; and a step of pulling in tracking. 2. An optical pickup having a rotation driving device for an optical disk, a plurality of types of laser optical systems having different wavelengths, a plurality of objective lenses having different lens diameters for recording and reproducing information on and from the optical disk, and controlling the drive. An optical disc recording / reproducing apparatus having a microcomputer including: a step of setting a disc rotation speed to a maximum rotation speed set in the setup processing; and a step of detecting out-of-focus and out-of-tracking. A step of detecting whether the address has been reproduced, and a step of detecting whether the optical pickup has reached the target address. When the optical pickup is out of focus, out of tracking, the address cannot be reproduced, and the target address has not reached, the reproduction signal is output. Change the equalizer characteristics of each stage and execute a retry If you can not play properly even if the retry process, the optical disc recording and reproducing apparatus comprising the steps of performing rezero process. 3. The optical disc recording / reproducing apparatus according to claim 2, wherein the means for changing the equalizer characteristics in each step is a means for changing the step of decreasing the double speed after the step of increasing the equalizer boost amount. 4. The optical disk recording / reproducing apparatus according to claim 2, wherein the means for changing the equalizer characteristics in each step is a means for changing the step of decreasing the double speed after the step of changing the equalizer cutoff frequency. 5. The means for changing the equalizer characteristic in each step is a means for changing the equalizer cutoff frequency after the step of increasing the equalizer boost amount, and then changing the step by lowering the double speed. Optical disk recording and playback device. 6. The rezeroing process includes: moving an optical pickup to an innermost circumference with respect to an optical disc; pulling a focus; adjusting a focus amplitude; and switching a plurality of objective lenses having different lens diameters. 3. The optical disk recording / reproducing apparatus according to claim 2, comprising a step.