JP2001184678A - Optical disc apparatus and focus control method therefor - Google Patents

Abstract

(57) [Problem] To provide an optical disc device capable of controlling a focus position (focus position) without being affected by a use environment or the like. A microcomputer controls a focus position on an optical information recording medium by adjusting a focus position of an optical pickup to a land and a groove, respectively.
The PID area is reproduced, the focus position is set so that the error amount of the PID is minimized, and information is recorded and reproduced in the drive test zone, and the jitter amount of the reproduced signal or the data error amount of the reproduced signal is reduced. To minimize
When the focus position in the land area and the groove area is set, and when information is recorded in the defect information management zone, the focus position is reproduced by reproducing a signal recorded in the defect information management zone, and the jitter amount of the signal is reproduced. Alternatively, control is performed such that the data error amount is set to a minimum and information is recorded or reproduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reproducing apparatus for an optical information recording medium or a recording / reproducing apparatus (hereinafter, simply referred to as an optical disk apparatus), and more particularly to a method for controlling a focus position.

[0002]

2. Description of the Related Art Conventionally, an optical disk for optically reading and reproducing recorded information from an optical information recording medium on which information is recorded by forming pits on a disk-shaped optical recording medium by utilizing a phase change or the like. Various types of devices are known and are already in 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 has been proposed and attracted attention, and a reproducing apparatus for reading out and reproducing the recorded information. Some of them are already commercially available.

In a high-density recording medium including a DVD or the like, a laser having a shorter wavelength than a conventional optical disk device such as a CD is used as an optical reproducing means in order to increase the information recording density on the disk-shaped medium. In addition to using light, in order to further improve the track pitch density, irregularities called land areas and groove areas are formed on the recording surface of the medium, and information is recorded in these areas. . Note that these land areas and groove areas alternately appear every turn following a tracking operation by an optical pickup as an optical reproducing means. Also,
As such a high-density recording medium, a recording medium capable of only reproducing recorded information, a recording medium capable of performing one-time recording,
Further, various recording media such as a recording medium capable of performing recording a plurality of times have been proposed. Note that these various recording media have different characteristics, particularly in terms of the reflectance and the like.

On the other hand, in a recording / reproducing apparatus for an optical information recording medium for reproducing recorded information from a high-density recording medium in which uneven portions called land areas and groove areas are formed, a conventional optical reproduction method has been used. The control of the focus position (focus position) of the means is performed in each round while synchronizing with an address signal recorded in advance in an area formed between the land area and the groove area, that is, an area called a pit address area. In addition, control is performed by alternately switching between the focus position for the land area and the focus position for the groove area.

[0005]

However, in the above-described high-density recording medium, in order to accurately reproduce or record information recorded at a high density, an optical pickup which is an optical reproducing means thereof is used. In particular, it is necessary to more precisely control the focus position of the focus lens. Normally, in the optical disk device, at the time of shipment, the focus position is adjusted so as to be controlled to a previously determined optimum position. However, the actual optimum focus position often differs from the preset focus position depending on, for example, the type and state of the recording medium, the use environment of the apparatus including the temperature, and the like.

A first object of the present invention is to solve the above-mentioned problems, and in particular, an optical disk apparatus capable of controlling a focus position (focus position) without being affected by a use environment, a type of a recording medium, and the like, and an optical disk apparatus therefor. It is to provide a focus control method.

A second object of the present invention is to provide an optical disc apparatus for controlling a focus position (focus position) suitable for high-density recording and a focus control method therefor.

[0008]

First, in order to achieve the first object, the present invention provides a land area, a groove area, and a space between the land area and the groove area. And a pit address area formed on the optical information recording medium, and on the recording surface of the optical information recording medium having the defect information management zone of the optical information recording medium, the focus position of the optical reproducing means is set to the land area and the groove area. A focus control method for an optical disc device for recording or reproducing information while controlling each of them, wherein a focus position of the optical reproducing unit in the land area and the groove area is recorded in the defect information management zone. The signal is reproduced and set so that the jitter amount of the signal or the error amount of data demodulated from the signal is minimized, and the information is recorded. Or focus control method of an optical disk apparatus for reproducing.

According to the present invention, in order to achieve the first object, a land area, a groove area,
A pit address area formed between the land area and the groove area, and, on a recording surface of an optical information recording medium including a defect information management zone and a drive test zone of the optical information recording medium, A focus control method for an optical disc apparatus for recording or reproducing information while controlling a focus position of an optical reproducing unit in accordance with the land area and the groove area, respectively, wherein the defect information management zone is not recorded. In the case, the pit address area is reproduced, and a focus position of the optical reproducing means in the land area and the groove area is set so that an error amount of data demodulated from the pit address signal is minimized. Information is recorded in the test zone, and then the recording section is reproduced, and the amount of jitter of the reproduced signal or The focus position of the optical reproducing means in the land area and the groove area is set so that the error amount of data demodulated from the reproduction signal is minimized, and when information is recorded in the defect information management zone, The focus position of the optical reproducing means in the land area and the groove area is set so that a signal recorded in the defect information management zone is reproduced, and a jitter amount of the signal or an error amount of data demodulated from the signal is minimized. With such settings, information is recorded or reproduced.

According to the present invention, in order to achieve the first object described above, a ROM area composed of concave and convex pits and a RAM area composed of a land area, a groove area and a pit address area are provided, and On the recording surface of the optical information recording medium provided with the defect information management zone and the drive test zone of the optical information recording medium, while controlling the focus position of the optical reproducing means in conformity with the land area and the groove area, respectively. A focus control method for an optical disc apparatus for recording or reproducing information, wherein when the defect information management zone is unrecorded, the ROM area is reproduced and the jitter amount of the reproduced signal or demodulated from the reproduced signal. After setting the focus position of the optical reproducing means so that the data error amount is minimized, the drive test zone is The information is recorded in the land area and the groove area and then reproduced, and the optical information in the land area and the groove area is minimized so that the jitter amount of the reproduction signal or the error amount of the data demodulated from the reproduction signal is minimized. When the focus position of the optical reproduction means is set and the information is recorded in the defect information management zone, the focus position of the optical reproduction means in the land area and the groove area is recorded in the defect information management zone. The recording or reproduction of information is performed by reproducing the signal and setting the amount of jitter of the signal or the amount of error of data demodulated from the signal to be minimized.

Further, in order to achieve the second object of the present invention, in the focus control method of the optical disk apparatus according to the present invention, the reproduction used when the focus position is set in the defect information management zone or the drive test zone. The track is such that signals are recorded on both tracks adjacent to the track.

In the present invention, the amount of jitter is obtained by binarizing the reproduced signal, detecting a phase error of a PLL, slicing the PLL at a predetermined level, converting the slice into an error pulse, and converting the error pulse into an error pulse. Is counted.

In the present invention, the data error amount is counted by the number of ECC errors (PI error or PO error) when demodulating the reproduction signal.

Also, in the present invention, the pit address is four PIDs (pit addresses) per sector.
The error amount of the data demodulated from the pit address signal counts the number of errors for the four PIDs.

Further, in the present invention, when counting the number of ECC errors, the defect information management zone is set to 8
Divided into ECC blocks, and the first block, the second block, the first block, the second block, and the DMA2 of the DMA1 in order from the inner circumference of the information recording medium.
The first block of the third block is used as the first block, the second block, and the first block of the reserve, and the focus position of the groove area is set using the first block of the reserve of the third block. The focus position of the land area is set using blocks.

According to the present invention, in order to achieve the above-mentioned first object, a land area, a groove area, and a pit address area formed between the land area and the groove area are provided. Further, on the recording surface of the optical information recording medium provided with the defect information management zone of the optical information recording medium, the focus position of the optical reproducing means is set to the land area and the groove area, respectively, to record or reproduce information. An optical disc device, comprising: a jitter measuring unit for measuring a jitter amount of a reproduced signal; or a data error measuring unit for measuring an error amount of data demodulated from the reproduced signal, wherein a signal recorded in the defect information management zone is provided. And the error amount of the data demodulated from the reproduced signal recorded in the defect information management zone. And a control means for setting the focus position of the optical reproducing means of the area and the groove area.

According to the present invention, in order to achieve the first object, a land area, a groove area,
A pit address area formed between the land area and the groove area, and, on a recording surface of an optical information recording medium including a defect information management zone and a drive test zone of the optical information recording medium, An optical disc device for recording or reproducing information by setting a focus position of an optical reproducing unit to each of the land area and the groove area, wherein the focus position setting unit sets the focus position to the land area and the groove area, respectively. Detection means for detecting whether the defect information management zone is unrecorded or recorded, PID error measurement means for reproducing the pit address area and measuring the data error amount of the pit address portion, Recording means for recording information in the drive test zone, and jitter measurement for measuring the amount of jitter in the reproduced signal Or a data error measuring means for measuring an error amount of data demodulated from the reproduced signal, and when the detecting means determines that the defect information management zone is unrecorded, measurement is performed by the PID error measuring means. The focus position setting means sets the focus position of the groove area and the land area so that the error amount obtained is minimized, and the recording means performs recording in the drive test zone. Control means for measuring an amount or a data error amount by the jitter measuring means and the data error measuring means, and setting a focus position of the optical reproducing means in the land area and the groove area so that the amount is minimized; If the detecting means determines that the defect information management zone has been recorded, the defect information management zone is set to the defect information management zone. Control for measuring the amount of signal jitter or data error by the jitter measuring means and the data error measuring means, and setting the focus position of the optical reproducing means in the land area and groove area so that the amount is minimized. Means.

According to the present invention, in order to achieve the first object described above, a ROM area composed of uneven pits and a RAM area composed of land areas, groove areas and pit address areas are provided, and On a recording surface of an optical information recording medium having a defect information management zone and a drive test zone of the optical information recording medium, a focus position of an optical reproducing unit is set in each of the land area and the groove area, and information is recorded. An optical disc device for recording or reproducing, a focus position setting means for setting the focus position in each of the land area and the groove area, and a detection for detecting whether the defect information management zone is unrecorded or recorded. ROM error measuring means for reproducing the ROM area and measuring a data error amount of the ROM section; Recording means for recording information in the live test zone, jitter measuring means for measuring the amount of jitter of the reproduced signal, or data error measuring means for measuring the error amount of data demodulated from the reproduced signal, wherein the detecting means comprises: When it is determined that the defect information management zone is unrecorded, the focus position is set so that the error amount measured by the ROM unit error measuring unit is minimized,
Recording in the drive test zone by the recording means,
The jitter amount or the data error amount of the reproduced signal from the recording unit is measured by the jitter measuring unit and the data error measuring unit, and the optical reproduction unit of the land area and the groove area is set so that the amount is minimized. Control means for setting a focus position, and when the detecting means determines that the defect information management zone has been recorded, the jitter amount or data error amount of the signal set in the defect information management zone, And a control means for measuring the data error measuring means and setting a focus position of the optical reproducing means in the land area and the groove area so as to minimize the amount.

Further, according to the present invention, in order to achieve the above-mentioned second object, there is provided the above-mentioned optical disk apparatus, wherein the reproduction used at the time of setting the focus position in the defect information management zone or the drive test zone. The track is set so that signals are recorded on both tracks adjacent to the track.

Further, according to the present invention, the jitter measuring means includes a binarizing means for binarizing a reproduction signal from the optical information recording medium,
PLL phase error detection means for detecting a phase error of LL;
It comprises error pulse conversion means for integrating the output from the PLL phase error detection means and converting it into an error pulse by slicing at a predetermined level, and jitter error pulse counting means for counting the error pulses.

According to the present invention, the data error measuring means counts the number of ECC errors (PI error or PO error) when demodulating the reproduction signal.
CC error counting means.

According to the present invention, the PID error measuring means is a PID error counting means for counting the number of errors for four PIDs (pit addresses) per sector.

According to the present invention, when counting the number of ECC errors, the defect information management zone includes a first block of DMA1, a second block, and a first block of reserve in order from the inner circumference of the information recording medium. When the ECC block is divided into a total of eight ECC blocks including a block, a second block, a first block of DMA2, a second block, a first block of reserve, and a second block, the focus position of the groove area is set to 3 The focus position of the land area is set using the first block of the fifth DMA2 using the first block of the reserve of the th block.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described.
This will be described with reference to the accompanying drawings.

First, a schematic configuration of an optical disk device according to the present invention will be described with reference to FIG. FIG. 2 is a block diagram of an optical information recording / reproducing optical disk apparatus of the present embodiment.

First, in FIG. 2, reference numeral 100 indicates an optical disk of a high-density information recording medium. Reference numeral 200 denotes a semiconductor laser 210, which is a light emitting element that generates laser light of a desired wavelength, a collimating lens 220 that converts emitted laser light into parallel light, and guides incident light to a mirror described below. A half mirror 230 for guiding the reflected light to a light receiving element to be described later; a mirror 240 for changing the direction of the light; and an objective lens 25 for irradiating the recording surface of the optical disc 100 with the laser light converging to a predetermined beam diameter.
0, an optical pickup which is an optical reproducing means including a light receiving element 260 for receiving and detecting the reflected light from the half mirror 230.

In this embodiment, the objective lens 25
In order to change the focal length in accordance with the thickness of the optical disc 100, 0 is composed of two objective lenses for DVD and CD. This pair of two objective lenses 250
It can be switched by a mechanism that moves quickly in the horizontal direction. Normally, when the tracking servo is working, there is a stable point at the optimum position, so if a kick pulse signal is given to the tracking control system when the lens moves, the lens will momentarily move horizontally and the tracking of other lenses will be stable. I try to fit in the point immediately. The configuration of the objective lens is not limited to this.
Needless to say, it is technically possible to use both D and CD.

In FIG. 2, reference numeral 300 denotes a signal processing section for performing predetermined processing by converting the reflected light into an electric signal, detected by the light receiving element 260 of the optical reproducing means. The signal processing unit 300 is connected to a microcomputer (hereinafter, simply referred to as a “microcomputer”) 400 provided for controlling the entire optical disc device, and includes a focus control method described in detail below. Various controls are performed. That is, this microcomputer 400
The laser drive unit 500,
The feed control unit 600, the spindle control unit 700, and the two-dimensional actuator control circuit 800 are connected.

That is, with the above configuration, the microcomputer 4
00 is an optical pickup 20 as the optical reproducing means.
The radius of the optical disc 100 of the optical pickup 200 is controlled by controlling the current supplied to the semiconductor laser 210, which is the light emitting element of No. 0, to control the light emission intensity, and by controlling the rotation of the motor 650 for feed control. Control the position in the direction. In this embodiment, the feed control motor 6 serves as a mechanism for moving the optical disc 100 in the radial direction.
A gear 660 for moving the optical pickup 200 in the radial direction by the rotation of 50 is shown. However, it is not limited to this.

Further, the microcomputer 400 controls the rotation of the motor 750 for driving the spindle to rotate.
CLV (Constant Linear Velocit), which is a constant linear velocity control widely used in such high-density information recording media.
y) or ZCLV (ZonedConstant Linear Velocit)
y) Realize control and so on. Furthermore, this microcomputer 400
The two-dimensional actuator control circuit 800 controls the focus position of the objective lens 250 of the optical pickup 200, for example, by controlling the electromagnetic coil 8 as its operating means.
It is realized by an electromagnetic action using 50 or the like.
Here, the two-dimensional actuator control circuit 80
The two-dimensional position control realized by 0 is not only position control (focus control) in the direction perpendicular to the recording surface of the optical disc 100 of the objective lens 250, but also fine position adjustment in the radial direction perpendicular to it. This includes tracking position control for following a track, and switching control of the two condensing optical lenses 220 described above.

Now, according to the optical disk device described above,
An interface control circuit (not shown) decodes a command or information data from a host (external device), not shown, such as a personal computer, and performs recording, reproduction, seek operation, and the like of information under the control of the microcomputer 400. . The signal processing unit 300 converts the signal and records information on the optical disc 100 via the optical pickup 200, and demodulates various signals read via the light receiving element 260 to the original data via the signal processing unit 300. Then, the demodulated data can be transferred from the interface control circuit to the host in response to the reproduction command. A detailed description of the information recording / reproducing operation is omitted.

In recording / reproducing, various control information recorded on the optical disk 100 is transmitted to the signal processing unit 3.
00 and used for control signals of the various devices described above.

Next, referring to FIG. 3 to FIG. 6, an optical disc 100 called a DVD-RAM among the information recording media will be described.
Will be described in detail. FIG. 3 is an external view of an optical disk 100 on which information is recorded / reproduced by an optical disk device.
FIG. 3A is a perspective view, and FIG. 3B is a plan view. FIG.
FIG. 4 is a sectional view of a land L and a groove G of an information recording portion in the optical disc 100 shown in FIG. FIG. 5 is an explanatory diagram showing a formation format of the land L and the groove G on the optical disc 100. FIG.
3 is a partially enlarged perspective view showing a pit address area formed between a land L and a groove G in FIG.

First, the optical disc 100 shown in FIG. 3 will be described. Among such optical discs, DVD-RA
In a recordable medium called M, writing information in a crystalline or amorphous state by irradiating a laser beam, for example, using a phase change, on a recording layer on the transparent substrate. Thereafter, the information recorded on the optical disc 100 is reproduced by reading the change in the reflectivity of crystalline and amorphous light due to the formation of the mark.

The optical disk 100 shown in FIG.
As an example, a recordable information recording medium called the above-mentioned DVD-RAM is cited. As shown in FIG. 3, a ROM area 110 in which predetermined control information and the like (control data) are recorded at the center thereof, It is divided into the surrounding RAM area 120. Then, in the optical disk as described above, as shown in FIG.
As an information recording portion, along a spiral track T for continuously recording information on a disk, in order to increase the recording density, it is divided into uneven areas called lands and grooves. It is formed to enable recording and reading of information.

Further, the RAM area 120 is divided into several areas. That is, information management areas 121 and 1 for information related to device control are provided inside and outside the RAM area 120.
22, a user area 123 for reading and writing user information is provided therebetween.

Further, the management areas 121 and 122
Are divided into a disk test zone, a drive test zone, a defect information management zone, and the like (not shown). The drive test zone is also used as a writing area when performing pre-write or the like described later. The defect information management zone is an area for recording defect management information of a disk, and is also called a DMA area. The user area 123 is composed of a plurality of areas (zones) that are further divided into a plurality in the radial direction.

Next, FIG. 4 shows a cross section of the land L and the groove G of the information recording section. These lands L
And the grooves G are formed alternately in the radial direction of the disk-shaped recording medium 100. Each of the lands L and the grooves G has a partial mark shown by a broken line in the figure, The information is recorded in a state different from the above (amorphous state or crystalline state).

FIG. 5 shows a format for forming the lands L and grooves G in such a high-density information recording medium. In FIG. 5, the lands L are indicated by hatched portions. The groove G is formed between these hatched portions. The lands L and the grooves G are alternately formed between the lands L and the grooves G in units of one circumference of the optical disc 100.
Note that, in this figure, the land L
And the groove G are switched. Each of the lands L and the grooves G is constituted by a unit called a plurality of sectors, and each sector is partitioned by an area called a pit address area PA. The RAM area 120 in the disk is divided into a plurality of areas (zones) from the inner circumference to the outer circumference. Each area is constituted by the same number of sectors.

FIG. 6 shows a pit address area formed between the land L and the groove G. First, FIG. 6A shows a portion (pit address area indicated by a dashed line in FIG. 5) that transitions from the land L to the groove G, and the laser beam for detecting the recording signal is: As shown by the dashed-dotted arrow in the figure, for example, a transition is made from the land L to the groove G through the pit address area PA.

On the other hand, FIG. 6 (b) shows a portion transitioning from the land L to the land L. Also in this case, a laser beam for detecting a recording signal is indicated by an alternate long and short dash line arrow. In this way, for example, the land L moves through the pit address area PA to the next land L. In addition, at the time of transition from the groove G to the next groove G,
As described above, it goes without saying that the light passes through the pit address area PA.

In the optical disc 100 described above, information is alternately recorded on lands L and grooves G having different heights. Therefore, in order to reliably reproduce information from the optical disc 100, an optical reproduction for reproducing information using reflection of a laser beam for each of the lands L and the grooves G having different optical heights. It is necessary to optimally control the focus position of an optical pickup as a means, particularly, an optical lens (objective lens) for converging and irradiating a laser beam onto a recording medium surface.

Further, it is necessary to add different offsets to the land and the groove due to the aberration of the detection system and the like.

At the same time, the pit address area P
As can be seen from FIG.
The address numbers on 0 are recorded on both sides by a plurality of pit strings P, P. Therefore, in order to reproduce information from the optical disc 100, it is necessary to accurately detect the plurality of pits P in the pit address area PA.

Therefore, in this embodiment, in reproducing the information from the optical disk 100, in order to optimally control the focus position of the optical lens in the optical reproducing means, so-called learning control is employed to optimize the position. And an optical information recording medium optical disk device capable of reliably detecting a pit row P for recording an address number in the pit address area PA.

Although not shown in the description of FIGS. 3 to 6, at the boundary between the land L and the groove G in the radial direction, the wobble (radial direction) in which the address information is modulated around a certain frequency and modulated. (A small amount of rocking) is formed. The number of wobbles per rotation is detected via a wobble detection circuit (not shown), and the motor 750 is efficiently controlled via the spindle control unit 700.
In addition, stable rotation control is achieved.

The pit address area PA is divided into two in the circumferential direction, and a pit row P is provided for each. And the ID obtained from these two pit rows P
By comparing the signals, data of adjacent sectors can be specified.

Next, FIG. 1 shows an optical pickup 200 which is an optical reproducing means in an optical disk apparatus for recording / reproducing an optical disk according to one embodiment of the present invention.
A detailed configuration including a light receiving element 260, a signal processing unit 300 that processes a detection signal of the light receiving element 260, and a peripheral part thereof is shown.

As is apparent from FIG. 1, the light receiving element 260 is divided into four detecting sections A, B, C, and D, and is reflected on the recording surface of the optical disc 100 to The reflected light incident on is converted into an electric signal by each of the divided detection units and output. The outputs from the divided detection units A, B, C, and D are input to addition circuits 301 to 304, and are respectively (A + C), (B + D), (A + D), and (B +
C) is added. Further, the outputs from the addition circuits 301 and 302 are input to an addition circuit 305, whereby the sum signal of (A + B + C + D) obtained by adding all the outputs from the detection units A, B, C, and D is added. Is output.

The outputs from the adders 301 and 302 are also input to the subtraction circuit 306 at the same time, so that the output of the subtraction circuit 306 has the tracking control represented by ((A + C)-(B + D)). , A tracking error signal TE is output.

On the other hand, the tracking error signal TE
At the same time, after passing through a low frequency pass filter (LPF) 308, the adder 309 adds the offset value from the D / A converter 310. For tracking control in the groove G, first, the polarity of the tracking error signal TE is inverted by the inverting circuit 312, and is further output to the two-dimensional actuator control circuit 800 via the switch element 315. On the other hand, land L
Is output to the two-dimensional actuator control circuit 800 via the switch element 318. However, the L / G switching signal is input to one of the switch elements, that is, the switch element 318 through which the tracking error signal of the land L passes, via the inverting circuit 312. That is, thereby, based on the tracking error signal TE,
Alternately, the tracking control signal of the land L and the groove G
Is output to the two-dimensional actuator control circuit 800. This output becomes a TR signal for controlling tracking, and the feed control unit 600 shown in FIG. 2 controls the position of the optical pickup 200 in the radial direction. The D / A converter 310
Is provided with an offset value from the microcomputer 400 via the A / D converter. Here, since the relationship with the present invention is weak, a detailed description thereof will be omitted.

On the other hand, the signals (A + D) and (B + C) output from the addition circuits 303 and 304 are input to a subtraction circuit 311, whereby ((A + D) − (B +
The focus error signal FE represented by C)) is obtained. The focus error signal FE is processed by being divided into the focus error signal FE in the land L and the focus error signal FE in the groove G, and thereafter, the two-dimensional actuator control circuit 800
Through the objective lens 250 of the optical pickup 200
(In the direction perpendicular to the recording surface of the optical disc 100).

That is, the focus error signal FE ((A + D)-(B) output from the subtraction circuit 311
+ C)) is applied with the focus offset by the adder 314, and is output to the two-dimensional actuator control circuit 800. The analog switch SW sets the offset of the groove G and land L in the D / A 313 and D / A 316.
It is applied to the adder 314 through 317.

The D / A converters 313 and 316
Are the offset values for the focus control in the groove G and the land L, respectively.
Given by In addition, the above analog switch SW3
A switching control signal output from the microcomputer 400, that is, a land L / groove G switching signal is also input to the control input 17.

The offset value added to the focus error signal FE via the D / A converters 313 and 316 is employed in the present invention to control the focus position of the optical lens to an optimum position. It is a variable that fluctuates as a result of learning in learning control. In addition,
When the optical disk device is shipped as a product, the optical disk device is shipped after being initialized to a predetermined value in advance. In addition,
The initial setting value is recorded in an EPROM or the like which is a recording unit of the microcomputer 400.

Further, the sum signal (A + B + C + D) from the adding circuit 305 is then supplied to a high frequency pass filter (HPF) 320 and a low frequency pass filter (LPF) 3
21, the data is demodulated by a data demodulation circuit 354 via a binarization circuit 351, and is taken into the microcomputer 400 as read data from the optical disc 100. Further, in this embodiment, the ECC error count and the PID error count are each 35 at the same time as the data demodulation.
5, and 356 are taken into the microcomputer 400. The jitter measuring circuit 352 includes a binarizing circuit 3
The data based on the amount of jitter of the output of 51 is converted into the number of jitter error pulses and output. This pulse number is taken into the microcomputer 400 via the jitter error pulse count 353.

Next, an operation flow from the mounting of the optical disk 100 of the optical disk device according to the present embodiment on a tray (not shown) to the state of being readable and writable (ready) will be described with reference to FIG.

In FIG. 7, first, when the optical disk 100 is mounted on the optical disk device, this is detected, and the type of the optical disk is determined (step 1001). Various methods such as a method of detecting a reflectance, a method of using a level of a focus / tracking signal, a method of detecting the presence or absence of a cartridge, a method of reading control data recorded on an optical disk, or a method of determining these are used. There is a method of determining in combination. In this embodiment, a combination of the above methods is used.
It is not limited to this.

If it is determined that the disc is a disc other than a DVD-RAM, the flow advances to step 1002 to perform various adjustment processes suitable for the disc, but details are omitted here. If it is determined that the disc is a DVD-RAM disc, the process proceeds to step 1007 and thereafter.

In this case, first, the optical disk device reads control information and the like (control data) recorded in the ROM unit 110 in the flow from step 1007 to step 1014. Specifically, after determining that the optical disk device is a DVD-RAM, the optical disk device adjusts the S-shaped amplitude of the focus signal (step 1008), and then adjusts the offset generated due to the electrical characteristics of the circuit (step 1009). Note that this offset is an offset peculiar to the electric circuit that occurs regardless of the type of the disc mounted on the optical disc device.

After the focus control is enabled in steps 1008 and 1009, the focus servo is turned on.
(Step 1010). Thereafter, the light irradiation position of the optical pickup 200 is moved to the ROM unit 110, and it is confirmed whether the destination is the ROM unit 110 (step 1011). If the destination is not the ROM unit 110, the operation of moving to the ROM unit 110 is performed again. And
The amplitude and balance of the tracking error signal TE are stored in ROM
Adjustment is performed so that tracking control can be performed by the unit 110 (step 1012). Thereafter, the tracking servo for the ROM section is turned on (step 1013), and control information and the like (control data) are read (step 1014).

Next, from step 1015 to step 10
According to the flow of 19, adjustments necessary for the focus control and the tracking control of the RAM unit 120 are performed. Specifically, first, the irradiation position of the light by the optical pickup 200 is moved to the RAM unit 120, and the destination is the RAM unit 120.
Is confirmed (step 1015). If the destination is not the RAM unit 120, the operation of moving to the RAM unit 120 is performed again. Next, the amplitude and balance of the tracking error signal TE in the RAM unit 120 are adjusted (step 1016), the tracking servo for the RAM unit 120 is turned on (step 1017), and the focus gain and the tracking gain are adjusted (step 1016). 1018) Then, fine adjustment of the focus offset is performed (step 1019).

Next, from step 1020 to step 10
According to the flow of 22, the data reading of the management area and the recording operation of the information are confirmed. Specifically, first, the optical pickup 200 is moved to the apparatus information area on the inner periphery, and data reading of the management area and amplitude adjustment of the reproduction signal are performed (step 1020). Next, pre-write (test writing) is performed at this inner peripheral position, and then the optical pickup 200 is moved to the outer read / write area 122 to perform test writing at this outer peripheral position (step 1021). Next, data reading of the management area at this outer peripheral position and amplitude adjustment of the reproduced signal are performed (step 1022). After ending these flows, the optical disk is brought into the ready state.

In the test writing, optimum adjustments regarding recording conditions such as recording power, erasing power, and recording waveform parameters suitable for the optical disk and the drive environment are performed.

Next, with reference to FIGS. 8 to 17, the focus control method of the optical disc apparatus of the present embodiment, particularly, the focus control method related to the fine adjustment of the focus offset will be further described. The following description is basically based on FIG.
1019 step (fine adjustment of focus offset) in the above embodiment.

FIG. 8 is a flowchart for explaining the focus control method, FIG. 9 is a block diagram of a circuit used for detecting the amount of jitter in the focus control method shown in FIG. 8, and FIG. FIGS. 11 and 12 are schematic diagrams schematically showing waveforms at respective portions, and FIGS. 11 and 12 are explanatory diagrams illustrating an optimal offset value set by the focus control method shown in FIG.

FIGS. 13, 14 and 17 are explanatory diagrams for explaining an ECC error detection method used when detecting an error amount of data in the focus control method shown in FIG.

FIG. 15 is a flowchart illustrating a focus control method according to another embodiment. FIG. 16 is a flowchart illustrating a focus control method according to another embodiment.

First, the flowchart shown in FIG. 8 is for reproducing a data signal recorded in the defect information management zone of the optical disc 100 and setting an optimum offset of a focus position. This setting is executed for each of the land L and the groove G.

In this flow, first, the offset of the focus error signal FE is set to an initial set value (step S11). That is, the microcomputer 400 replaces the initial setting value recorded in the EPROM or the like at the time of shipment with D
/ A converters 313 and 316 are set. Thereafter, as shown in FIG. 11 attached thereto, the microcomputer 400 performs a plurality of steps for control (for example, +8) around the initial set value (0), as shown in FIG.
Steps to -8 steps) are set, each step value is set as an offset value of the focus error signal FE to change the focus position, and data reproduction at these plural focus positions is performed. Make a decision. Note that this data reproduction is performed in the DMA area which is a defect information management zone of the optical disc 100.

That is, in FIG. 9, first, the above-mentioned steps from 0 to -8 are sequentially set as the offset value (step S12), and the data reproduction is determined also by each of the focus positions (step S13). ,
As a result, if the data reproduction is within a predetermined error (“OK”), the offset value is stored (step S1).
4) This is repeated until data reproduction becomes larger than a predetermined error (“NG”). Thereafter, similarly to the above, the offset value is sequentially set from 0 to +8 steps (step S15), and data reproduction is determined (step S15).
16), store an offset value within a predetermined error (step S17), and repeat until data reproduction becomes larger than the predetermined error (“NG”). Finally, an optimum value is determined based on the offset value. The offset is set (step S18), and the process ends. In this embodiment, the offset value at the optimum focus position is calculated by INT ((A + B) / 2), where A is the offset value stored on the minus side and B is the offset value stored on the plus side. The calculation method is not limited to this,
What is necessary is just to set the offset value to a substantially center value of the A and B values.

FIG. 11 shows an example of the above setting. In this case, since A = -3 and B = + 5, the optimum offset value is +1.

As one embodiment of the method for judging data reproduction in FIG. 8, a method for measuring an error amount using jitter will be described with reference to FIGS. 9 and 10. FIG. The jitter measuring circuit 352 is provided between the binarizing circuit 351 and the jitter error pulse counting circuit 353 in FIG.
Phase error detection circuit 361, integration circuit 362, comparison circuit 3
63. FIG. 10 schematically shows the output waveform of each circuit, and FIG. 10 (A) is a waveform obtained by binarizing the reproduction output. Based on the binarized waveform of (A), a PLL phase error is detected as shown in (B), and the output is integrated to obtain a signal having a height based on the amount of jitter as shown by the solid line in (C). Is obtained. By slicing this signal at a predetermined level, a reproduced waveform having a predetermined jitter amount or more is converted into a pulse (D). The number of pulses is counted by the jitter error pulse counting circuit 353 to measure the amount of jitter in the reproduced signal.

The microcomputer 400 shown in FIG. 1 determines the data reproduction OK or NG by processing the jitter error pulse count for each focus offset. That is, when the jitter error pulse count is equal to or greater than a predetermined value, it is NG, and when it is equal to or less than a predetermined value, it is OK. With this determination, the optimum focus offset value that minimizes the jitter can be easily obtained as described above. Here, it does not matter how much the predetermined value of the error pulse count is set. Naturally, it changes depending on the number of data to be measured, and the setting value of the slice level greatly changes. Therefore, the set value of the slice level and the set value of the jitter count are
It should be optimized for the drive system.

Next, the reproduction position of the data reproduction signal will be described. Reproduction is performed separately for each land and groove, and the focus offset value is also set separately.For example, when reproducing a land track, when a signal is recorded on groove tracks on both sides adjacent to the track, recording is performed. Sometimes not. When recording on a groove track, the adjacent track becomes a land track, and in this case also, there are times when the adjacent track is recorded and times when it is not recorded.

FIGS. 11 and 12 show the case where the land track is reproduced. FIG. 11 shows the case where the signal is recorded on the groove tracks on both sides, and FIG. 12 shows the case where the signal is not recorded. The optimum offset value is obtained by measurement. In FIG. 11, the optimal offset value is +1, and in FIG. 12, the optimal offset value is +2. As described above, the optimum offset value changes depending on whether or not recording is performed on the adjacent track.

This is considered to be due to the influence of crosstalk from adjacent tracks, and the difference on the positive side of the offset is particularly large (this is the case with the optical head circuit used in this embodiment, The difference on the minus side may be larger.) In most cases on real optical disks,
Since signals are recorded on adjacent tracks, in the present invention, when an optimal focus offset is set by the above-described focus control method, signals are recorded on adjacent tracks on both sides. This is a method that is particularly effective when the track recording density is increased.

Next, as another embodiment of the data reproduction judging method in FIG. 8, a method using an error amount of demodulated data will be described with reference to FIGS. 13, 14 and 17. FIG. In this embodiment, an ECC error is detected as the error amount.

FIG. 13 is a flowchart for explaining one method of generating recording data to be recorded on an optical disk, and FIG. 14 is a data configuration diagram showing an example of recording data. In the recording data, an error detection code (IED) is added to the data ID (step 1201), and further main data is added (step 1202). Next, these data are scrambled (step 1203), ECC encoded (step 1204), and interleaved (step 1205) to obtain recording data.
This recording data block is defined as an ECC block.
Data is recorded on the optical disc in C block units.

FIG. 14 shows the structure of the ECC block. The ECC block has 182 bytes of data of 208 bytes.
It has a line-up configuration. 10 out of 182 bytes
The bytes are error codes called PI (inner parity code), and out of the 208 lines, 16 lines are error codes called PO (outer parity code).
The combination of PI and PO is called an ECC error code. Twelve rows of data including the PO1 row are recorded in the sector which is a recording unit on the optical disc. Therefore, in order to record one of the ECC blocks, 16 sectors (that is, 13 rows × 16 sectors = 208 rows) are recorded on the optical disc.

Data can be extracted from the signal recorded on the optical disk by performing the reverse process of FIG. That is, the data of the ECC block shown in FIG. 14 is demodulated from the reproduced signal of the optical disc,
Decode C. At the time of ECC decoding, a PI error and a PO error are detected as ECC errors. ECC
After decoding, the scramble is further released to obtain main data and ID data.

In the data error detection of this embodiment, as shown in FIG.
20, passes through the LPF 321, passes through the binarization circuit 351, performs the above-described process such as ECC decoding in the data demodulation circuit 354, and sends main data and ID data to the microcomputer 400.
ECC CC pulse (PO error, PI error)
The error is counted by the error count circuit 355 and the microcomputer 40
Send the count data to 0.

The microcomputer 400 determines the data reproduction OK or NG by processing the ECC error pulse count for each focus offset. That is, when the jitter error pulse count is equal to or greater than a predetermined value, it is NG, and when it is equal to or less than a predetermined value, it is OK. By this determination, the optimum focus offset value that minimizes the ECC error can be easily obtained in the same manner as in the case of detecting the jitter amount described above. Here, it is not a big problem to set the predetermined value of the error count number to what value. Naturally, it changes depending on the number of data to be measured, and it differs depending on whether PO or PI is selected or both are used. Therefore, the set value of the count number may be optimized in the drive system in consideration of the number of focus setting steps and the like.

Next, a preferred embodiment in the case where an ECC error is used for the above determination will be described with reference to FIG. FIG.
Shows an example of a defect information management zone of the optical disc 100. The number of sectors in this zone is 25 (sector 0 to sector 24), and the defect information management zone includes the following eight ECC blocks from the inner periphery. First ECC block of DMA1 Second ECC block of DMA1 First ECC block of reserve Second ECC block of DMA2 First ECC block of DMA2 First ECC block of DMA2 Reserve Here, as shown in FIG. 17, the first ECC block of the DMA1
The CC block starts at sector 18 of the groove, and the second ECC block of the last reserve is sector 2 of the land.
It ends with 1.

In order to measure the ECC error for each land and groove, the ECC block must be completed within the land and groove. Further, it is desirable that signals are recorded on adjacent tracks on both sides of the land track and the groove track to be measured as described above.
In this embodiment, the focus position of the groove is set to the second position of the third reserve so as to satisfy these conditions.
And the land focus position is set using the first ECC block of the fifth DMA2. This makes it possible to set a good focus offset value for both the land and the groove.

Next, a focus control method according to another embodiment of the present invention will be described with reference to the flowchart of FIG.

In the above-described embodiment, the signal has already been recorded in the defect information management zone. However, since the signal is not always recorded, in this embodiment, it is determined whether or not the defect information management zone is unrecorded or recorded (step S22). The optimum focus offset is set by reproducing the defect information management zone (step S2).
3) If the zone has not been recorded, the following steps are performed. In step S24, first, the PI
The coarse adjustment of the optimum focus offset is performed by detecting the D error. In the next step S25, the optical disk 1
Data is recorded in the drive test zone provided at 00. In this case, at least four consecutive tracks are recorded so that adjacent tracks on both sides of the land and groove are recorded. Next, the optimum focus offset is set by performing reproduction in the same manner as when reproducing the defect management zone using the recording unit (step S).
26), end. According to the present embodiment, not only can the optimum focus offset be set even when the defect information management zone is unrecorded, but if the defect information management zone is already recorded, it is not necessary to record it in the drive test zone. As a whole, there is an advantage that the time for setting the optimum focus offset can be shortened.

This embodiment will be described in more detail with reference to FIG. First, the envelope detection circuit 357 of FIG. 1 is used to determine whether or not the defect information management zone is unrecorded. Sum signal of detector 260 (A + B
+ C + D) enters the envelope detection circuit 357 through the HFP 320 and the LPF 321. The envelope circuit detects the signal level of the sum signal. When the defect information management zone is reproduced and the information is recorded, the signal level is detected by the envelope detection circuit, and when the information is not recorded, the signal is almost zero. Therefore,
The envelope detection circuit determines the recording state of the defect information management zone, and sends the determination information to the microcomputer 400.

Next, detection of the PID error will be described. As shown in FIG. 6, the optical disc 100 has a pit address area composed of concave and convex pits for each sector, and address information on the disc is recorded in this area in advance. The address information is called PID, and four PIDs are arranged in each sector. The address information is stored in the optical disk 1
Since it is provided in advance at 00, coarse adjustment of the focus offset is performed using the unit before recording. To reproduce the PID, the data demodulation circuit 354 in FIG. 1 decodes the PID signal and outputs whether the PID was correctly read as a PID error. The output is counted by the PID error count circuit 356, and the count data is sent to the microcomputer 400.

The method of coarsely adjusting the focus offset using the PID error is the same as the method of counting and adjusting the jitter error pulse described above.

Next, the optical head is moved to the drive test zone to record data. The semiconductor laser 210 of FIG.
Is recorded by the laser drive circuit 500 in accordance with the recording data.

The method of reproducing the recorded data and setting the optimum focus offset is the same as the method performed in the defect information management zone, and a description thereof will be omitted.

Next, a focus control method according to another embodiment of the present invention will be described with reference to the flowchart of FIG. This embodiment is different from the embodiment shown in FIG.
Since only the rough adjustment method is different, the method (step S
Only 34) will be described.

In step S34, coarse adjustment of the optimum focus offset is performed by reproducing the inner ROM section 110 of the optical disc 100. That is, the data in the ROM section is demodulated by the data demodulation circuit 354 in FIG.
The CC error count circuit 355 counts ECC errors and sends count data to the microcomputer 400. ECC
The method of coarsely adjusting the focus offset using an error is the same as the method of counting and adjusting the ECC error pulse described above.

In the above embodiment, the coarse adjustment of the focus offset was performed so that the jitter amount or the data error amount was minimized before recording in the drive test zone. However, the present invention is not limited to this. According to the flowchart shown in (1), since the data can be reproduced in the ROM area, the coarse adjustment can be skipped.

In the description of each embodiment described above,
Defect information management zone, drive test zone 1 each
However, the present invention is not limited to this, and it may be performed at two locations, the inner circumference and the outer circumference. Further, even if an appropriate place is provided in addition to the inner and outer circumferences, the effect of the present invention is not impaired.

[0097]

According to the present invention, it is possible to provide an optical disk device capable of controlling the focus position (focus position) without being particularly affected by the use environment.

[Brief description of the drawings]

FIG. 1 is a circuit configuration diagram of an optical disk device according to an embodiment of the present invention.

FIG. 2 is a device block diagram of a readable / writable optical disk device according to an embodiment of the present invention.

FIG. 3 is an external view of a DVD which is an optical disk on which information can be reproduced and recorded by the optical disk device according to the embodiment of the present invention.

4 is a cross-sectional view of a land area and a groove area of an information recording unit in the DVD of FIG.

FIG. 5 is an explanatory diagram showing a formation format of a land area and a groove area in the DVD of FIG. 3;

FIG. 6 is a partially enlarged perspective view showing a pit address area formed between a land area and a groove area in the DVD of FIG. 3;

FIG. 7 is an operation flow diagram of the optical disk device of the embodiment of the present invention from the time of setting the disk to the ready state.

FIG. 8 is a flowchart illustrating a focus control method according to the embodiment of the present invention.

9 is a block diagram of a circuit used for detecting a jitter amount by the focus control method shown in FIG.

FIG. 10 is an explanatory diagram schematically showing waveforms at respective portions in FIG. 9;

FIG. 11 is an explanatory diagram illustrating an optimal offset value set by the focus control method shown in FIG.

FIG. 12 is another explanatory diagram for explaining an optimal offset value set by the focus control method shown in FIG. 9;

13 is an explanatory diagram for describing an ECC error detection method used when detecting an error amount of data in the focus control method shown in FIG. 8, and is one diagram for generating recording data to be recorded on an optical disc. It is a figure explaining a method.

14 is an explanatory diagram for explaining an ECC error detection method used when detecting an error amount of data in the focus control method shown in FIG. 8, and is a configuration diagram of an ECC block.

FIG. 15 is a flowchart illustrating a focus control method according to another embodiment.

FIG. 16 is a flowchart illustrating a focus control method according to another embodiment.

17 is an explanatory diagram for describing an ECC error detection method used when detecting an error amount of data by the focus control method illustrated in FIG. 8, and is a diagram illustrating an example of a defect information management zone of an optical disc; It is.

[Explanation of symbols]

Reference Signs List 100 optical disk (high-density optical recording medium), 210 semiconductor laser, 220 focusing optical lens, 230 half mirror, 250 objective lens, 260 light receiving element (detector), 303, 304 addition circuit, 311 ... Subtraction circuit, 313,316 ... D / A, 314 ... Adder, 3
17: Analog switch SW, 351: Binarization circuit, 3
52 ... jitter measurement circuit, 354 ... data demodulation circuit, 36
1: PLL phase error detection circuit, 362: integration circuit, 36
3: comparison circuit, 400: microcomputer, 800: two-dimensional actuator control circuit.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Atsushi Saito 292, Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside Digital Media Development Division, Hitachi, Ltd. 5D090 AA01 BB02 BB04 BB11 CC01 CC05 CC14 DD03 DD05 EE01 EE11 EE18 FF05 FF15 GG10 GG30 GG36 HH01 5D118 AA13 BA01 BF02 BF03 CA11 CA25 CD08

Claims (18)

[Claims] An optical information device comprising a land area, a groove area, a pit address area formed between the land area and the groove area, and an optical information recording medium comprising a defect information management zone. A focus control method for an optical disc apparatus for recording or reproducing information on a recording surface of a recording medium while controlling a focus position of an optical reproducing unit so as to be adapted to the land area and the groove area, respectively. The focus position of the optical reproducing means in the groove area is adjusted so that the signal recorded in the defect information management zone is reproduced, and the jitter amount of the signal or the error amount of data demodulated from the signal is minimized. A focus control method for an optical disc device, comprising setting and recording or reproducing information. An optical information recording medium comprising: a land area; a groove area; a pit address area formed between the land area and the groove area; A focus control method for an optical disc apparatus for recording or reproducing information on a recording surface of an optical information recording medium having a recording area while controlling a focus position of an optical reproducing means in conformity with the land area and the groove area, respectively. When the defect information management zone is unrecorded, the pit address area is reproduced, and the optical information in the land area and the groove area is minimized so that an error amount of data demodulated from the pit address signal is minimized. Information is recorded in the drive test zone by setting the focus position of the dynamic reproduction means. The reproduction is performed, and the focus position of the optical reproducing means in the land area and the groove area is set so that the jitter amount of the reproduction signal or the error amount of data demodulated from the reproduction signal is minimized. When information is recorded in the management zone, the focus position of the optical reproducing means in the land area and the groove area is reproduced by reproducing a signal recorded in the defect information management zone, and the jitter amount of the signal or the A focus control method for an optical disc apparatus, wherein information is recorded or reproduced by setting an error amount of data demodulated from a signal to be a minimum. 3. A ROM area comprising concave and convex pits and an R area comprising land areas, groove areas and pit address areas.
And a focus position of the optical reproducing means on the land area and the groove area on the recording surface of the optical information recording medium having the AM area and the defect information management zone and the drive test zone of the optical information recording medium. A focus control method for an optical disc apparatus for recording or reproducing information while controlling each of them appropriately, wherein when the defect information management zone is unrecorded, the ROM area is reproduced, and a jitter amount of the reproduced signal is reproduced. Alternatively, after setting a focus position of the optical reproducing means so that an error amount of data demodulated from the reproduction signal is minimized, after recording information in the land area and the groove area using the drive test zone, The land is reproduced so that the jitter amount of the reproduced signal or the error amount of data demodulated from the reproduced signal is minimized. When information is recorded in the defect information management zone, the focus position of the optical reproducing means in the land area and the groove area is set to the defect position. The signal recorded in the information management zone is reproduced, and the recording or reproduction of information is performed by setting the amount of jitter of the signal or the amount of error of data demodulated from the signal to be minimized. A focus control method for an optical disc device. 4. A ROM area comprising concave and convex pits, and an R area comprising land areas, groove areas and pit address areas.
And a focus position of the optical reproducing means on the land area and the groove area on the recording surface of the optical information recording medium having the AM area and the defect information management zone and the drive test zone of the optical information recording medium. A focus control method for an optical disk device for recording or reproducing information while controlling each of them in an adaptive manner, wherein when the defect information management zone has not been recorded, the ROM area is reproduced and the focus of the optical reproducing means is adjusted. After setting the position to a value at which the reproduction data can be reproduced correctly, or confirming that the focus position is set at a value at which the reproduction data can be reproduced correctly, the drive test zone is used. In the land area and the groove area, information is recorded and then reproduced and demodulated from the jitter amount of the reproduced signal or the reproduced signal. The focus position of the optical reproducing means in the land area and the groove area is set so that the error amount of the read data is minimized, and when information is recorded in the defect information management zone, the land area and the groove are The focus position of the optical reproducing means in the area is set so that the signal recorded in the defect information management zone is reproduced and the jitter amount of the signal or the error amount of data demodulated from the signal is minimized. Recording or reproducing information, and a focus control method for an optical disc device. 5. A focus control method for an optical disk device according to claim 1, wherein a reproduction track used for setting said focus position in said defect information management zone or said drive test zone is adjacent to said track. A focus control method for an optical disc device, wherein signals are recorded on tracks on both sides. 6. The focus control method for an optical disk device according to claim 1, wherein the jitter amount is obtained by binarizing the reproduction signal, detecting a phase error of a PLL,
Slicing at a predetermined level, converting it to an error pulse,
A focus control method for an optical disk device, wherein the focus control is performed by counting the number of error pulses. 7. The focus control method for an optical disk device according to claim 1, wherein the error amount of the data is a number of ECC errors (PI) when demodulating the reproduction signal.
A focus error of the optical disc apparatus. 8. A focus control method for an optical disk device according to claim 2, wherein said pit address has four PIDs (pit addresses) per sector, and data of data demodulated from said pit address signal is provided. A focus control method for an optical disk device, wherein the error amount counts the number of errors for the four PIDs. 9. The focus control method for an optical disc device according to claim 5, wherein said defect information management zone is divided into eight ECC blocks, and said defect information management zone is divided into eight ECC blocks in order from an inner periphery of said information recording medium. First block, second block, reserve first block, second block,
As the first block, the second block, and the first block and the second block of the DMA2, the focus position of the groove area is set using the first block of the reserve of the third block. A focus control method for an optical disk device, wherein a focus position of a land area is set using one block. 10. An optical information device comprising a land area, a groove area, a pit address area formed between the land area and the groove area, and comprising a defect information management zone of the optical information recording medium. An optical disc apparatus for recording or reproducing information by setting a focus position of an optical reproducing means on the recording surface of a recording medium in the land area and the groove area, and measuring a jitter amount of a reproduced signal. Means, or a data error measuring means for measuring an error amount of data demodulated from the reproduction signal, and a jitter amount of a signal recorded in the defect information management zone or a reproduction signal recorded in the defect information management zone. The focus of the optical reproducing means in the land area and the groove area so that the error amount of data demodulated from Optical disk apparatus characterized by comprising a control means for setting the location. 11. An optical information recording medium comprising a land area, a groove area, a pit address area formed between the land area and the groove area, a defect information management zone and a drive test zone. An optical disc device for recording or reproducing information by setting a focus position of an optical reproducing unit on the land area and the groove area on a recording surface of an optical information recording medium comprising: Focus position setting means for setting the land area and groove area, detecting means for detecting whether the defect information management zone is unrecorded or recorded, and reproducing the pit address area, P to measure data error
ID error measuring means, recording means for recording information in the drive test zone, jitter measuring means for measuring a jitter amount of a reproduced signal, or data error measuring means for measuring an error amount of data demodulated from the reproduced signal. When the detecting means determines that the defect information management zone is unrecorded, the focus position setting means sets the groove area and the land area so that the error amount measured by the PID error measuring means is minimized. The focus position is set, recording is performed in the drive test zone by the recording unit, the jitter amount or the data error amount of the reproduced signal from the recording unit is measured by the jitter measuring unit and the data error measuring unit, The focus position of the optical reproducing means in the land area and the groove area is set so that this amount is minimized. Control means for performing the jitter measurement or the data error measurement, when the detection means determines that the defect information management zone has been recorded, the jitter amount or the data error amount of the signal set in the defect information management zone. An optical disc device comprising: a control unit that sets a focus position of the optical reproduction unit in the land area and the groove area so that the amount is minimized. 12. An optical information recording medium comprising a ROM area composed of concave and convex pits, a RAM area composed of a land area, a groove area and a pit address area, and a drive test zone. An optical disc device for recording or reproducing information by setting a focus position of an optical reproducing unit on the recording surface of an optical information recording medium in the land area and the groove area, respectively, wherein the focus position is the land area and the groove area. Focus position setting means for setting each in the groove area; detecting means for detecting whether the defect information management zone is unrecorded or recorded; and reproducing the ROM area to determine a data error amount of the ROM section. ROM section error measuring means for measuring, recording means for recording information in the drive test zone, and reproduction signal Jitter measuring means for measuring the amount of jitter, or comprising a data error measuring means for measuring the error amount of data demodulated from the reproduction signal, when the detecting means determines that the defect information management zone is unrecorded, The focus position is set so that the error amount measured by the ROM unit error measuring unit is minimized, recording is performed in the drive test zone by the recording unit, and the amount of jitter or data error of the reproduced signal from the recording unit is recorded. The jitter measuring means, the data error measuring means to measure, the control means for setting the focus position of the optical reproduction means of the land area and the groove area so that this amount is minimized, the detection means is If it is determined that the defect information management zone has been recorded, the jitter amount or data of the signal recorded in the defect information management zone is determined. Control means for measuring an error amount by the jitter measuring means and the data error measuring means, and setting a focus position of the optical reproducing means in the land area and the groove area so that the amount is minimized. An optical disc device characterized by the above-mentioned. 13. An optical information recording medium comprising a ROM area composed of concave and convex pits, a RAM area composed of a land area, a groove area, and a pit address area, and a drive test zone. An optical disc device for recording or reproducing information by setting a focus position of an optical reproducing unit on the recording surface of an optical information recording medium in the land area and the groove area, respectively, wherein the focus position is the land area and the groove area. Focus position setting means for setting each in the groove area; detecting means for detecting whether the defect information management zone is unrecorded or recorded; and reproducing the ROM area so that the data in the ROM section is correctly reproduced. Data reproduction confirming means for confirming that it can be performed; recording means for recording information in the drive test zone; Jitter measuring means for measuring a jitter amount of the reproduced signal or, a data error measuring means for measuring the amount of error data demodulated from the reproduction signal,
When the detecting means determines that the defect information management zone is unrecorded, it is set to a focus position where data can be correctly reproduced by the data reproduction confirming means of the ROM section, or it is confirmed that the focus position has already been set, The recording means performs recording in the drive test zone, and the amount of jitter or data error of the reproduced signal from the recording section is measured by the jitter measuring means and the data error measuring means. Control means for setting a focus position of the optical reproduction means in the land area and groove area, and a signal set in the defect information management zone when the detection means determines that the defect information management zone has been recorded. The jitter amount or the data error amount is measured by the jitter measuring unit and the data error measuring unit, and the amount is set to a minimum. Optical disk apparatus characterized by comprising a control means for setting the focus position of the optical reproducing means of the land area and groove area. 14. The optical disk device according to claim 10, wherein a reproduction track used for setting said focus position in said defect information management zone or said drive test zone is a track on both sides adjacent to said track. An optical disk device characterized in that a signal is set to be recorded. 15. The optical disk device according to claim 10, wherein said jitter measuring means binarizes a reproduction signal from said optical information recording medium,
A PLL phase error detecting means for detecting a PLL phase error from an output signal from the binarizing means; an output from the PLL phase error detecting means being integrated and converted into an error pulse by slicing at a predetermined level; An optical pulse device comprising: an error pulse converting means for converting the error pulse; and a jitter error pulse counting means for counting the error pulse. 16. The optical disk device according to claim 10, wherein said data error measuring means counts the number of ECC errors (PI error or PO error) when demodulating said reproduction signal. An optical disk device characterized by being means. 17. The optical disk device according to claim 12, wherein said PID error measuring means is a PID error counting means for counting the number of errors for four PIDs (pit addresses) per sector. An optical disc device characterized by the above-mentioned. 18. The optical disk device according to claim 14, wherein the defect information management zone is a first block, a second block, and a first block of a DMA1 in order from an inner circumference of the information recording medium. , The second block,
When divided into a total of eight ECC blocks of the first block, the second block of the DMA2, the first block of the reserve, and the second block, the focus position of the groove area is set to the eighth block of the reserve of the third block. An optical disc device, wherein one block is used, and the focus position of the land area is set using the first block of the fifth DMA2.