JP3975630B2 - Optical disc apparatus and focus control method thereof - Google Patents

Description

[0001]
BACKGROUND 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]
[Prior art]
Conventionally, an optical disc apparatus for optically reading out and reproducing recorded information from an optical information recording medium in which information is recorded by forming pits on a disk-shaped optical recording medium using phase change or the like has been widely used. A method of this type is known and already in practical use. In particular, 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 attracting attention and a reproducing apparatus for reading out and reproducing the recorded information Some of them are already on the market.
[0003]
By the way, in such a high-density recording medium including a DVD or the like, a laser beam having a shorter wavelength than that of 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, 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. The land area and the groove area appear alternately every round following the tracking operation by the optical pickup which is an optical reproducing means. In addition, as such a high-density recording medium, various types of recording such as a recording medium capable of only reproducing recorded information, a recording medium capable of recording once, and a recording medium capable of recording a plurality of times are available. A medium has been proposed. Note that these various recording media have different characteristics, particularly in reflectance.
[0004]
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, the focus of the optical reproducing means has hitherto been known. For the control of the position (focus position), in synchronization 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, Control was performed by alternately switching between a focus position for the land area and a focus position for the groove area.
[0005]
[Problems to be solved by the invention]
However, in a high-density recording medium such as that described above, in order to accurately reproduce or record information recorded at high density, an optical pickup that is an optical reproducing means, particularly a focus position of the focus lens. It is necessary to control more precisely. Normally, an optical disc apparatus is adjusted so that its focus position is controlled to an optimum position obtained in advance at the time of shipment. 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.
[0006]
SUMMARY OF THE INVENTION A first object of the present invention is to solve the above-mentioned problems, and in particular, an optical disc apparatus capable of controlling a focal position (focus position) without being affected by the use environment, the type of recording medium, and the like, and its focus control method. Is to provide.
[0007]
A second object of the present invention is to provide an optical disc apparatus that performs focus position control that is suitable for high-density recording, and a focus control method thereof.
[0008]
[Means for Solving the Problems]
First, in order to achieve the first object described above, the present invention provides a land area, a groove area, and a pit address area formed between the land area and the groove area. On the recording surface of the optical information recording medium provided with the defect information management 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 an image, wherein the focus position of the optical reproducing means in the land area and the groove area is reproduced, and a signal recorded in the defect information management zone is reproduced. An optical disc that records or reproduces information by setting the jitter amount or the error amount of data demodulated from the signal to a minimum. It is the location of the focus control method.
[0009]
According to the present invention, in order to achieve the first object described above, a land area, a groove area, and a pit address area formed between the land area and the groove 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,
When the defect information management zone is unrecorded, the optical reproduction in the land area and the groove area is performed so that the error amount of the data demodulated from the pit address signal is reproduced. The focus position of the means is set, information is recorded in the drive test zone, and then the recording unit is reproduced, so that the jitter amount of the reproduced signal or the error amount of data demodulated from the reproduced signal is minimized. So as to set the focus position of the optical reproduction means in the land area and the groove area,
When information is recorded in the defect information management zone, the focus position of the optical reproducing means in the land area and groove area is reproduced, the signal recorded in the defect information management zone is reproduced, and the jitter of the signal is reproduced. Set the amount of error or the amount of data demodulated from the signal to the minimum,
Information is recorded or reproduced.
[0010]
In addition, according to the present invention, in order to achieve the first object described above, a ROM area including concave and convex pits, and a RAM area including land areas, groove areas, and pit address areas are provided, and optical information is provided. On the recording surface of the optical information recording medium having a defect information management zone and a drive test zone of the recording medium, information is controlled 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,
When the defect information management zone has not been recorded, the optical reproduction means is adapted to reproduce the ROM area and minimize the jitter amount of the reproduction signal or the error amount of data demodulated from the reproduction signal. After setting the focus position, information is recorded and reproduced in the land area and groove area using the drive test zone, and the jitter amount of the reproduced signal or the error amount of data demodulated from the reproduced signal is minimized. So as to set the focus position of the optical reproduction means in the land area and the groove area,
When information is recorded in the defect information management zone, the focus position of the optical reproducing means in the land area and groove area is reproduced, the signal recorded in the defect information management zone is reproduced, and the jitter of the signal is reproduced. Set the amount of error or the amount of data demodulated from the signal to the minimum,
Information is recorded or reproduced.
[0011]
Furthermore, in order to achieve the second object of the present invention, in the focus control method of the optical disk apparatus described above, the reproduction track used when setting the focus position in the defect information management zone or the drive test zone is Signals are recorded on both tracks adjacent to the track.
[0012]
Also, in the present invention, the jitter amount is binarized after the reproduction signal is detected, the phase error of the PLL is detected, sliced at a predetermined level, converted into error pulses, and counted by the number of error pulses. Is.
[0013]
In the present invention, the error amount of the data is counted by the number of ECC errors (PI error or PO error) when demodulating the reproduction signal.
[0014]
In the present invention, the pit address includes four PIDs (pit addresses) per sector, and the error amount of data demodulated from the pit address signal is the number of errors for the four PIDs. To count.
[0015]
In the present invention, when the number of ECC errors is counted, the defect information management zone is divided into eight ECC blocks, and the first block and second block of the DMA 1 are sequentially formed from the inner periphery of the information recording medium. The focus of the groove area using the first block of the reserve of the third block as the block, the first block of the reserve, the second block, the first block of the DMA2, the second block, the first block of the reserve, and the second block Position setting is performed, and the focus position of the land area is set using the first block of the fifth DMA2.
[0016]
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 a light An optical disc apparatus for recording or reproducing information by setting a focus position of an optical reproducing means in the land area and groove area on a recording surface of an optical information recording medium having a defect information management zone of the information recording medium. A jitter measuring means for measuring the jitter amount of the reproduced signal, or a data error measuring means for measuring an error amount of data demodulated from the reproduced signal, and the jitter amount of the signal recorded in the defect information management zone Alternatively, the land area and the group are set so that an error amount of data demodulated from the reproduction signal recorded in the defect information management zone is minimized. And a control means for setting the focus position of the optical reproducing means of chromatography blanking area.
[0017]
According to the present invention, in order to achieve the first object described above, a land area, a groove area, and a pit address area formed between the land area and the groove area are provided, and On the recording surface of the optical information recording medium having the defect information management zone and the drive test zone of the optical information recording medium, the focus position of the optical reproducing means is set in the land area and the groove area, respectively. An optical disc device for recording or reproducing,
Focus position setting means for setting the focus position in the land area and the groove area, detection means for detecting whether the defect information management zone is unrecorded or recorded, and reproducing the pit address area PID error measuring means for measuring the data error amount in the pit address portion, recording means for recording information in the drive test zone, jitter measuring means for measuring the jitter amount of the reproduction signal, or data demodulated from the reproduction signal A data error measuring means for measuring the error amount of
When the detection means determines that the defect information management zone has not been recorded, the focus position setting means focuses the groove area and land area so that the error amount measured by the PID error measurement means is minimized. The position is set, recording is performed in the drive test zone by the recording means, and the jitter amount or data error amount of the reproduction signal from the recording portion is measured by the jitter measuring means and the data error measuring means. Control means for setting the focus position of the optical reproduction means of the land area and the groove area so that the
When the detection unit 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 is measured by the jitter measurement unit and the data error measurement unit. And a control means for setting the focus position of the optical reproduction means for the land area and the groove area so that this amount is minimized.
[0018]
In addition, according to the present invention, in order to achieve the first object described above, a ROM area including concave and convex pits, and a RAM area including land areas, groove areas, and pit address areas are provided, and optical information is provided. On the recording surface of an optical information recording medium having a defect information management zone and a drive test zone of the recording medium, the focus position of the optical reproducing means is set in the land area and the groove area, and information is recorded or reproduced. An optical disc device that performs
Focus position setting means for setting the focus position in the land area and groove area, detection means for detecting whether the defect information management zone is unrecorded or recorded, and reproducing the ROM area, ROM section error measuring means for measuring the data error amount of the ROM section, recording means for recording information in the drive test zone, jitter measuring means for measuring the jitter amount of the reproduced signal, or data demodulated from the reproduced signal A data error measuring means for measuring the error amount of
When the detection unit determines that the defect information management zone is not recorded, the focus position is set so that the error amount measured by the ROM unit error measurement unit is minimized, and the drive test is performed by the recording unit. Recording is performed in the zone, and the jitter amount or data error amount of the reproduction signal from the recording unit is measured by the jitter measuring means and the data error measuring means, and the land area and groove area are minimized so that the amount is minimized. Control means for setting the focus position of the optical reproduction means;
When the detection unit 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 is measured by the jitter measurement unit and the data error measurement unit. And a control means for setting the focus position of the optical reproduction means for the land area and the groove area so that this amount is minimized.
[0019]
Furthermore, according to the present invention, in order to achieve the second object, the optical disc apparatus described above, the reproduction track used when the focus position is set in the defect information management zone or the drive test zone, It is set so that signals are recorded on the tracks on both sides adjacent to the track.
[0020]
Further, according to the present invention, the jitter measuring means includes a binarizing means for binarizing the reproduction signal from the optical information recording medium, and a PLL phase error from the output signal from the binarizing means. PLL phase error detecting means for detecting, error pulse converting means for integrating an output from the PLL phase error detecting means and slicing at a predetermined level, and jitter error for counting the error pulses It consists of pulse counting means.
[0021]
According to the present invention, the data error measuring means is an ECC error counting means for counting the number of ECC errors (PI error or PO error) when demodulating the reproduction signal.
[0022]
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.
[0023]
Further, according to the present invention, when counting the number of ECC errors, the defect information management zone includes the first block of the DMA1, the second block, the first block of the reserve, the first block, in order from the inner periphery of the information recording medium. When the block is divided into a total of 8 ECC blocks including 2 blocks, the first block of DMA2, the second block, the first block of reserve, and the second block, the focus position of the third block is set for the focus position of the groove area. The first block of reserve is used, and the focus position of the land area is set using the first block of the fifth DMA2.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
[0025]
First, a schematic configuration of an optical disc apparatus according to the present invention will be described with reference to FIG. FIG. 2 is a block diagram of an optical information apparatus that can read and write data from an optical information recording medium according to this embodiment.
FIG.
[0026]
First, in FIG. 2, reference numeral 100 indicates an optical disk as a high-density information recording medium. Reference numeral 200 denotes a semiconductor laser 210 that is a light emitting element that generates laser light of a desired wavelength, a collimator lens 220 that collimates the emitted laser light, and guides incident light to a mirror described later. A half mirror 230 for guiding reflected light to a light receiving element to be described later, a mirror 240 for changing the direction of the light, an objective lens 250 for irradiating the recording surface of the optical disc 100 with a predetermined beam diameter, and the objective lens 250 2 shows an optical pickup that is an optical reproducing means including a light receiving element 260 that receives and detects reflected light from a half mirror 230.
[0027]
Here, in this embodiment, the objective lens 250 is composed of two objective lenses for DVD and CD in order to change the focal length in accordance with the thickness of the optical disc 100. The pair of two objective lenses 250 can be switched by a mechanism that quickly moves 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 moving the lens, the lens will instantaneously move horizontally to stabilize the tracking of other lenses. I try to fit it instantly. The configuration of the objective lens is not limited to this, and it goes without saying that, for example, it is technically possible to use a single objective lens for both DVD and CD.
[0028]
In FIG. 2, reference numeral 300 denotes a signal processing unit for performing a predetermined process 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 “microcomputer”) 400 provided for performing overall control of the optical disc apparatus, and includes a focus control method described in detail below. Various controls are performed. That is, the microcomputer 400 is connected to the laser drive unit 500, the feed control unit 600, the spindle control unit 700, and the two-dimensional actuator control circuit 800 so that various controls can be performed.
[0029]
That is, with the above configuration, the microcomputer 400 controls the light intensity by controlling the current supplied to the semiconductor laser 210, which is the light emitting element of the optical pickup 200, which is the optical reproducing means, and also for the feed control. By controlling the rotation of the motor 650, the position of the optical pickup 200 in the radial direction of the optical disc 100 is controlled. In this embodiment, a mechanism for moving the optical disc 100 in the radial direction is represented by a gear 660 for moving the optical pickup 200 in the radial direction by the rotation of the feed control motor 650. However, the present invention is not limited to this.
[0030]
Further, the microcomputer 400 controls the rotation of the motor 750 that rotates the spindle to thereby control CLV (Constant Linear Velocity) or ZCLV (Zoned), which is a constant linear velocity widely used in such high-density information recording media. Realizes constant linear velocity control. Further, the microcomputer 400 uses the two-dimensional actuator control circuit 800 to control the focus position of the objective lens 250 of the optical pickup 200, for example, by using an electromagnetic coil 850 or the like as its operating means by electromagnetic action. is doing. Here, the two-dimensional position control realized by the two-dimensional actuator control circuit 800 includes position control (focus control) of the objective lens 250 in the direction perpendicular to the recording surface of the optical disc 100, and further In addition, tracking position control for following the track by minute position adjustment in the radial direction perpendicular to it, and switching control of the two condensing optical lenses 220 are also included.
[0031]
Now, according to the optical disk device described above, an instruction or information data from a host (external device) (not shown) such as a personal computer is decoded by an interface control circuit (not shown), and information is controlled under the control of the microcomputer 400. Perform recording, playback, seek operations, etc. In addition, the signal processing unit 300 converts the signal and records information on the optical disc 100 through the optical pickup 200, and various signals read through the light receiving element 260 are demodulated into original data through 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 will be omitted.
[0032]
In the recording / reproduction, various control information recorded on the optical disc 100 is generated by the signal processing unit 300 and used for the control signals of the various apparatuses described above.
[0033]
Next, an optical disc 100 called a DVD-RAM among the information recording media will be described in detail with reference to FIGS. 3A and 3B are external views of the optical disc 100 on which information is recorded / reproduced by the optical disc apparatus, in which FIG. 3A is a perspective view and FIG. 3B is a plan view. 4 is a cross-sectional view of the land L and the groove G of the information recording unit in the optical disc 100 shown in FIG. FIG. 5 is an explanatory diagram showing a format for forming lands L and grooves G on the optical disc 100. FIG. 6 is a partially enlarged perspective view showing a pit address area formed between the land L and the groove G in the optical disc 100.
[0034]
First, the optical disc 100 shown in FIG. 3 will be described. Among such optical discs, in particular, in a recordable medium called DVD-RAM, a crystalline layer or an amorphous state is applied to the recording layer on the transparent substrate by laser irradiation, for example, using phase change. The information can be written by creating a mark, and the information recorded on the optical disc 100 is reproduced by reading the change in reflectance of crystalline and amorphous light caused by the creation of the mark. To do.
[0035]
The optical disc 100 shown in FIG. 3 uses a recordable information recording medium called DVD-RAM as an example, and as shown in FIG. data), and a peripheral RAM area 120. In the optical disk as described above, as shown in FIG. 3 (b), the RAM area 120 is provided along the spiral track T for continuously recording information on a disk as its information recording portion. In order to increase the recording density, information is recorded and read out by being divided into so-called uneven regions called lands and grooves.
[0036]
Further, the RAM area 120 is divided into several areas. That is, management areas 121 and 122 for information related to device control are provided inside and outside the RAM area 120, and a user area 123 for reading and writing user information is provided between them.
[0037]
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 disk defect management information, 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.
[0038]
Next, FIG. 4 shows a cross section of the land L and the groove G of the information recording unit. These lands L and grooves G are alternately formed in the radial direction of the disk-shaped recording medium 100, and each of these lands L and grooves G has a partial mark indicated by a broken line in the figure. Information is recorded in a different state (amorphous state or crystalline state) from the other portions.
[0039]
Further, FIG. 5 shows the formation format of the land L and the groove G in such a high-density information recording medium. In this figure, the land L is indicated by a hatched portion, while the groove G is It is formed between these hatched portions. The lands L and the grooves G are formed while alternately changing between the lands L and the grooves G in units of one round of the optical disc 100. In this figure, the land L and the groove G are switched with the portion of the alternate long and short dash line as a boundary. The land L and the groove G are composed of a plurality of units called 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 periphery toward the outer periphery. Each area is composed of the same number of sectors.
[0040]
FIG. 6 shows a pit address area formed between the land L and the groove G. First, FIG. 6A shows a portion (a pit address area of a portion indicated by a one-dot chain line in FIG. 5) that moves from the land L to the groove G, and the laser beam for detecting the recording signal is For example, as indicated by the one-dot chain line arrow in the figure, the land L moves to the groove G through the pit address area PA.
[0041]
On the other hand, FIG. 6 (b) shows a portion that moves from the land L to the land L. Also here, the laser beam for detecting the recording signal is as indicated by the dashed-dotted arrow in the figure. For example, the land L moves to the next land L through the pit address area PA. Needless to say, the transition from the groove G to the next groove G also passes through the pit address area PA as described above.
[0042]
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 such an optical disc 100, optical reproduction is performed in which information is reproduced from each of these optically different lands L and grooves G by using reflection of laser light. It is necessary to optimally control the focus position of an optical lens (objective lens) for converging and irradiating the surface of a recording medium with laser light, which is a means.
[0043]
Furthermore, it is necessary to add different offsets to the land and the groove due to the aberration of the detection system.
[0044]
At the same time, in the pit address area PA, as is apparent from the figure, the address numbers on the optical disc 100 are recorded on both sides by a plurality of pit rows 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.
[0045]
Therefore, in this embodiment, in reproducing information from the optical disc 100, so as to optimally control the focus position of the optical lens in the optical reproducing means, so-called learning control is adopted to perform optimum position control. In addition, the optical information recording medium is an optical disc apparatus that can reliably detect a pit row P for recording an address number in the pit address area PA.
[0046]
Although not shown in the description of FIG. 3 to FIG. 6, wobbles (a small amount in the radial direction) meandering with address information modulated around a certain frequency at the boundary between the land L and the groove G in the radial direction. A rocking) groove system is formed. The number of wobbles per rotation is detected via a wobble detection circuit (not shown), and the motor 750 is efficiently and stably rotated via the spindle control unit 700. .
[0047]
The pit address area PA is divided into two in the circumferential direction, and a pit row P is provided for each. Then, by comparing the ID signals obtained from these two pit rows P, the data of adjacent sectors can be specified.
[0048]
Next, FIG. 1 shows a light receiving element 260 in an optical pickup 200 which is an optical reproducing means in an optical disk apparatus for recording / reproducing an optical disk according to an embodiment of the present invention, and signal processing for processing a detection signal thereof. A detailed configuration including the part 300 and its peripheral part is shown.
[0049]
As is clear from FIG. 1, the light receiving element 260 is divided into four detection portions A, B, C, and D, reflected by the recording surface of the optical disc 100 and incident on the light receiving element 260. The reflected light is converted into an electrical signal by each of the divided detectors and output. The divided outputs from the detection units A, B, C, and D are input to addition circuits 301 to 304, and (A + C), (B + D), (A + D), and (B + C) are added, respectively. Done. Further, the outputs from the adder circuits 301 and 302 are input to the adder circuit 305, whereby a sum signal of (A + B + C + D) is obtained by adding all the outputs from the detection units A, B, C, and D. Is output.
[0050]
The outputs from the adder circuits 301 and 302 are also input to the subtractor circuit 306 at the same time, whereby a signal for tracking control represented by ((A + C)-(B + D)) is included in the output. A tracking error signal TE is output.
[0051]
On the other hand, the tracking error signal TE passes through a low-frequency pass filter (LPF) 308 at the same time, and then an adder 309 adds an 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 inversion circuit 312 and further output to the two-dimensional actuator control circuit 800 via the switch element 315. On the other hand, for tracking control in the land L, it is then output to the two-dimensional actuator control circuit 800 via the switch element 318. However, the L / G switching signal is input via the inverting circuit 312 to one switch element, that is, the switch element 318 through which the tracking error signal of the land L passes. That is, based on the tracking error signal TE, the land L tracking control signal and the groove G tracking control signal are alternately output to the two-dimensional actuator control circuit 800. This output becomes a TR signal for controlling tracking, and the position of the optical pickup 200 in the radial direction is controlled by the feed controller 600 shown in FIG. The D / A converter 310 is given an offset value from the microcomputer 400 via its A / D converter. Here, since the relationship with the present invention is weak, detailed description thereof is omitted.
[0052]
On the other hand, the signals (A + D) and (B + C) output from the adder circuits 303 and 304 are input to the subtractor circuit 311, whereby the focus error signal FE represented by ((A + D) − (B + 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 then the optical pickup 200 via the two-dimensional actuator control circuit 800. The focus position of the objective lens 250 (direction perpendicular to the recording surface of the optical disc 100) is controlled.
[0053]
That is, the focus error signal FE ((A + D) − (B + C)), which is an output from the subtraction circuit 311, is applied with a focus offset by the adder 314 and is output to the two-dimensional actuator control circuit 800. The offset settings of the groove G and land L in the D / A 313 and D / A 316 are applied to the adder 314 through the analog switch SW317.
[0054]
The D / A converters 313 and 316 are given from the microcomputer 400 offset values for focus control in the groove G and land L, respectively. Further, the switching control signal output from the microcomputer 400, that is, the land L / groove G switching signal, is also input to the control input of the analog switch SW317.
[0055]
Also, the offset value added to the focus error signal FE via the D / A converters 313 and 316 is the learning control employed in the present invention to control the focus position of the optical lens to the optimum position. It is a variable that varies as a result of learning. It should be noted that at the time of shipment as a product of the optical disk device, the product is initially set to a predetermined value before shipment. The initial set value is recorded in an EPROM or the like that is a recording unit of the microcomputer 400.
[0056]
Further, the sum signal (A + B + C + D) from the adder circuit 305 is then passed through a high-frequency pass filter (HPF) 320 and a low-frequency pass filter (LPF) 321, passes through a binarization circuit 351, and then in a data demodulation circuit 354 The information recording data is demodulated and taken into the microcomputer 400 as read data from the optical disc 100. In this embodiment, simultaneously with data demodulation, the ECC error count and the PID error count are taken into the microcomputer 400 via 355 and 356, respectively. As will be described later, the jitter measurement circuit 352 converts data based on the jitter amount output from the binarization circuit 351 into the number of jitter error pulses and outputs it. This number of pulses is taken into the microcomputer 400 via the jitter error pulse count 353.
[0057]
Next, an operation flow from the mounting of the optical disk 100 of the optical disk apparatus according to the present embodiment to a tray (not shown) to the read / write ready state will be described with reference to FIG.
[0058]
In FIG. 7, first, when the optical disc 100 is loaded in the optical disc apparatus, this is detected and the type of the optical disc is determined (step 1001). The discrimination method includes various methods such as a method of detecting reflectance, a method of using the level of the focus / tracking signal, a method of detecting the presence / absence of a cartridge, a method of reading control data recorded on an optical disc, or these methods. There is a method of discriminating in combination. In the present embodiment, a combination of the above methods is used, but the present invention is not limited to this.
[0059]
If it is determined that the disk is other than the DVD-RAM, the process proceeds to step 1002 and various adjustment processes adapted to the disk are performed, but the details are omitted here. If it is determined that the disc is a DVD-RAM disc, the process proceeds to step 1007 and subsequent steps.
[0060]
In this case, first, the optical disc apparatus reads control information or 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 apparatus is a DVD-RAM, the optical disk apparatus adjusts the S-shaped amplitude of the focus signal (step 1008), and then adjusts the offset generated by the electrical characteristics of the circuit (step 1009). This offset is an electric circuit-specific offset that occurs regardless of the type of the disc loaded in the optical disc apparatus.
[0061]
After enabling focus control in steps 1008 and 1009, the focus servo is turned on (step 1010). Thereafter, the irradiation position of the light by 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 moving operation to the ROM unit 110 is performed again. Then, the amplitude and balance of the tracking error signal TE are adjusted so that the ROM 110 can perform tracking control (step 1012). Thereafter, the tracking servo for the ROM section is turned on (step 1013), and control information or the like (control data) is read (step 1014).
[0062]
Next, along the flow from step 1015 to step 1019, adjustments necessary for focus control and 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 it is confirmed whether the destination is the RAM unit 120 (step 1015). If the destination is not the RAM unit 120, the movement operation 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). 1018), and then fine adjustment of the focus offset is performed (step 1019).
[0063]
Next, along the flow from step 1020 to step 1022, data in the management area is read and information recording operation is confirmed. Specifically, first, the optical pickup 200 is moved to the device information area on the inner circumference, and data reading in the management area and amplitude adjustment of the reproduction signal are performed (step 1020). Next, prewrite (trial writing) is performed at the inner circumferential position, and then the optical pickup 200 is moved to the outer read / write area 122 to perform trial writing at the outer circumferential position (step 1021). Next, data reading of the management area at this outer periphery position and amplitude adjustment of the reproduction signal are performed (step 1022). These flows are terminated and the optical disk is set to the ready state.
[0064]
In the trial 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.
[0065]
Next, with reference to FIGS. 8 to 17, a focus control method of the optical disk apparatus of the present embodiment, particularly a focus control method related to focus offset fine adjustment will be further described. The following description basically relates to step 1019 (focus offset fine adjustment) of the above-described embodiment of FIG.
[0066]
FIG. 8 is a flowchart for explaining the focus control method, FIG. 9 is a block diagram of a circuit used for detecting the jitter amount in the focus control method shown in FIG. 8, and FIG. 10 is a diagram of each part in FIG. FIG. 11 and FIG. 12 are explanatory diagrams schematically showing waveforms, and are explanatory diagrams for explaining the optimum offset value set by the focus control method shown in FIG.
[0067]
13, FIG. 14 and FIG. 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.
[0068]
FIG. 15 is a flowchart for explaining a focus control method according to another embodiment. FIG. 16 is a flowchart for explaining a focus control method according to another embodiment.
[0069]
First, the flowchart shown in FIG. 8 reproduces the data signal recorded in the defect information management zone of the optical disc 100 and sets an optimum offset of the focus position. This setting is executed for each of the land L and the groove G.
[0070]
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 sets the initial setting values recorded in the EPROM or the like at the time of shipment in the D / A converters 313 and 316. Thereafter, the microcomputer 400 performs a plurality of steps (for example, +8 step to −8) for controlling the offset initial setting value before and after the initial setting value (0) as shown in FIG. 16 steps (up to 8 steps) are set, the respective step values are set as offset values of the focus error signal FE, the focus position is changed, and data reproduction is determined at these multiple focus positions. . This data reproduction is performed in the DMA area which is the defect information management zone of the optical disc 100.
[0071]
That is, in FIG. 9, first, the offset value is set sequentially from the above 0 to -8 steps (step S12), and data reproduction is also determined by their respective focus positions (step S13). If the data reproduction is within a predetermined error (“OK”), the offset value is stored (step S14), and this is repeated until the data reproduction becomes larger than the predetermined error (“NG”). Thereafter, in the same manner as described above, offset values are sequentially set from 0 to +8 steps (step S15), data reproduction is determined (step S16), and an offset value within a predetermined error is stored (step S17). The data reproduction is repeated until it becomes larger than a predetermined error (“NG”). Finally, an optimum offset is set based on the offset value (step S18), and the process is terminated. In this embodiment, the offset stored value on the minus side is A, the offset stored value on the plus side is B, and the offset value of the optimum focus position is calculated as INT ((A + B) / 2). Note that the calculation method is not limited to this, and the offset value may be set to substantially the center value of the A and B values.
[0072]
FIG. 11 shows an example of the above settings. In this case, since A = −3 and B = + 5, the optimum offset value is +1.
[0073]
As one embodiment of the data reproduction determination method in FIG. 8, an error amount measurement method using jitter will be described with reference to FIGS. The jitter measurement circuit 352 is installed between the binarization circuit 351 and the jitter error pulse count circuit 353 in FIG. 1, and includes a PLL phase error detection circuit 361, an integration circuit 362, and a comparison circuit 363. FIG. 10 schematically shows the output waveform of each circuit. FIG. 10A shows a waveform obtained by binarizing the reproduction output. Based on the binarized waveform of (A), when a PLL phase error is detected as shown in (B) and this output is integrated, 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 reproduction waveform having a predetermined jitter amount or more is converted into a pulse (D). The jitter amount of the reproduction signal is measured by counting the number of pulses by the jitter error pulse count circuit 353.
[0074]
The microcomputer 400 shown in FIG. 1 determines whether data reproduction is OK or NG by processing the jitter error pulse count for each focus offset. That is, when the jitter error pulse count number is not less than a predetermined value, it is NG, and when it is not more than a predetermined value, it is OK. By this determination, the optimum focus offset value that minimizes the jitter can be easily obtained as described above. Here, it is not a big problem how many the predetermined value of the error pulse count number is set. Of course, it varies depending on the number of data to be measured, and also greatly varies with the set value of the slice level. Accordingly, the setting value of the slice level and the setting value of the jitter count number may be optimized in the drive system.
[0075]
Next, the playback location of the data playback signal will be described. Playback is performed separately for each land and groove, and the focus offset value is also set separately. For example, when playing a land track, recording is performed when the signal is recorded on the groove tracks on both sides adjacent to the track. There are times when it has not been done. When recording on the groove track, the adjacent track becomes a land track, and in this case, the adjacent track may or may not be recorded.
[0076]
FIGS. 11 and 12 show the case where the land track is reproduced. FIG. 11 shows the optimum when the signal is recorded on the groove tracks on both sides, and FIG. 12 shows the optimum by the above jitter amount measurement when the signal is not recorded. The offset value is obtained. In FIG. 11, the optimum offset value is +1, and in FIG. 12, the optimum offset value is +2. Thus, the optimum offset value changes depending on whether or not the adjacent track is recorded.
[0077]
This is considered to be due to the influence of crosstalk from adjacent tracks, and the difference is particularly large on the plus side of the offset (this is the case with the optical head / circuit used in this embodiment, and on the minus side) The difference may be greater). In most actual optical disks, signals are recorded on adjacent tracks. Therefore, in the present invention, when an optimum focus offset is set by the focus control method, signals are recorded on adjacent tracks on both sides. To do. This is an effective method particularly when the track recording density is increased.
[0078]
Next, as another embodiment of the data reproduction determination method in FIG. 8, a method using an error amount of demodulated data will be described with reference to FIG. 13, FIG. 14, and FIG. In this embodiment, an ECC error is detected as the error amount.
[0079]
FIG. 13 is a flowchart for explaining one method for generating recording data to be recorded on the optical disc, and FIG. 14 is a data configuration diagram showing an example of the 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, after these data are scrambled (step 1203), recording data is obtained by ECC encoding (step 1204) and interleaving (step 1205). This recording data block is used as an ECC block, and data is recorded on the optical disk in units of the ECC block.
[0080]
FIG. 14 shows the configuration of the ECC block. The ECC block has a configuration in which 208 lines of 182 bytes of data are collected. Of the 182 bytes, 10 bytes are error codes called PI (inner parity code), and of 208 lines, 16 are error codes called PO (outer parity code). Call it a code. In the sector, which is a recording unit on the optical disc, 12 rows of data including the PO1 row are recorded. Therefore, in order to record one block of the ECC block, 16 sectors (that is, 13 rows × 16 sectors = 208 rows) are recorded on the optical disk.
[0081]
In order to extract data from the signal recorded on the optical disk, the reverse process of FIG. That is, the ECC block data shown in FIG. 14 is demodulated from the reproduction signal of the optical disc, the interleave is released, and the ECC is decoded. During ECC decoding, PI error and PO error are detected as ECC errors. After the ECC decoding, the scramble is further broken to obtain main data and ID data.
[0082]
In the data error detection of this embodiment, as shown in FIG. 1, the sum signal of the reproduction detector 260 is passed through the HPF 320 and LPF 321, and the above process such as ECC decoding is performed in the data demodulation circuit 354 through the binarization circuit 351. The main data and ID data are sent to the microcomputer 400, and the ECC error pulse (PO error, PI error) from the data demodulation circuit 354 is counted by the ECC error count circuit 355, and the count data is sent to the microcomputer 400.
[0083]
The microcomputer 400 determines whether data reproduction is OK or NG by processing the ECC error pulse count for each focus offset. That is, when the jitter error pulse count number is not less than a predetermined value, it is NG, and when it is not more than a predetermined value, it is OK. By this determination, an optimum focus offset value that minimizes the ECC error can be easily obtained as in the case of detecting the jitter amount described above. Here, it is not a big problem how many the predetermined values of the error count are set. Of course, it varies 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 setting value of the count number may be optimized in the drive system in consideration of the number of focus setting steps.
[0084]
Next, a preferred embodiment when an ECC error is used for the above determination will be described with reference to FIG. FIG. 17 shows an example of the defect information management zone of the optical disc 100. The number of sectors in the zone is 25 (sector 0 to sector 24), and the defect information management zone is composed of the following eight ECC blocks from the inner periphery.
DMA1 first ECC block
DMA1 second ECC block
Reserve first ECC block
Reserve second ECC block
DMA2 first ECC block
DMA2 second ECC block
Reserve first ECC block
Reserve second ECC block
Here, as shown in FIG. 17, the first ECC block of the DMA1 starts from the sector 18 of the groove, and the second ECC block of the last reserve ends at the sector 21 of the land.
[0085]
In order to measure the ECC error in each land and groove, the ECC block must be completed in the land and groove. Further, as described above, it is desirable that signals are recorded on adjacent tracks on both sides of the land track and groove track to be measured. In order to satisfy these conditions, in this embodiment, the focus position of the groove is set using the second ECC block of the third reserve, and the focus position of the land is set to the first of the fifth DMA2. The ECC block is used. As a result, it is possible to set a good focus offset value for both the land and the groove.
[0086]
Next, a focus control method according to another embodiment of the present invention will be described with reference to the flowchart of FIG.
[0087]
In the embodiment described above, 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 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 S23). If the zone is not recorded, the following steps are executed. In step S24, the optimum focus offset is roughly adjusted by detecting a PID error prior to recording. In the next step S25, data recording is performed in a drive test zone provided in the optical disc 100. In this case, at least four consecutive tracks are recorded so that adjacent tracks on both sides of the land and groove are already recorded. Next, using the recording unit, the optimum focus offset is set by performing reproduction in the same manner as when reproducing the defect management zone (step S26), and the process ends. According to this embodiment, not only can the optimum focus offset be set even if the defect information management zone is not recorded, but if the defect information management zone has been recorded, it is not necessary to record in the drive test zone. As a whole, there is an advantage that the time for setting the optimum focus offset can be shortened.
[0088]
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. The sum signal (A + B + C + D) of the detector 260 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 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 recording state of the defect information management zone is determined by the envelope detection circuit, and the determination information is sent to the microcomputer 400.
[0089]
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 advance in this area. The address information is referred to as PID, and four PIDs are arranged in each sector. Since the address information is provided in advance on the optical disc 100, coarse adjustment of the focus offset is performed using this portion prior to recording. To reproduce the PID, the data demodulation circuit 354 in FIG. 1 decodes the PID signal and simultaneously outputs whether or not the PID was read correctly 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.
[0090]
The method of coarse adjustment of the focus offset using the PID error is the same as the method of adjusting by counting the jitter error pulses described above.
[0091]
Next, the optical head is moved to the drive test zone to perform data recording. Data recording is performed by causing the laser driving circuit 500 to emit light according to the recording data in the semiconductor laser 210 of FIG.
[0092]
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 will not be described.
[0093]
Next, a focus control method according to another embodiment of the present invention will be described with reference to the flowchart of FIG. Since the present embodiment is different from the embodiment shown in FIG. 15 only in the coarse adjustment method, only the method (step S34) will be described.
[0094]
In step S34, the optimum focus offset is roughly adjusted by reproducing the inner ROM section 110 of the optical disc 100. That is, the data demodulating circuit 354 in FIG. 1 demodulates the data in the ROM portion, and the ECC error counting circuit 355 counts ECC errors, and sends the count data to the microcomputer 400. The method of coarse adjustment of the focus offset using the ECC error is the same as the method of adjusting by counting the ECC error pulses described above.
[0095]
In the embodiment described above, the focus offset is roughly adjusted so that the jitter amount or the data error amount is minimized before recording in the drive test zone. However, the present invention is not limited to this, and is shown in FIG. In the case of following the flowchart, since the data reproduction is already possible in the ROM area, the above rough adjustment can be skipped.
[0096]
In the description of each embodiment described above, one defect information management zone and one drive test zone are provided. However, the present invention is not limited to this. Further, even if an appropriate place is provided in addition to the inner and outer periphery, the effect of the present invention is not impaired.
[0097]
【The invention's effect】
According to the present invention, it is possible to provide an optical disc apparatus capable of controlling the focal 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 disc apparatus according to an embodiment of the present invention.
FIG. 2 is an apparatus block diagram of a readable / writable optical disc apparatus according to an embodiment of the present invention.
FIG. 3 is an external view of a DVD that is an optical disc on which information can be reproduced and recorded by the optical disc apparatus 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. 3;
5 is an explanatory diagram showing a formation format of land areas and groove areas 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 flowchart of the optical disc apparatus according to the embodiment of the present invention from the time when the disc is set to the ready state.
FIG. 8 is a flowchart illustrating a focus control method according to an embodiment of the present invention.
9 is a block diagram of a circuit used when detecting the amount of jitter in the focus control method shown in FIG.
FIG. 10 is an explanatory diagram schematically showing waveforms of respective parts in FIG. 9;
11 is an explanatory diagram for explaining an optimum offset value set by the focus control method shown in FIG. 9. FIG.
12 is another explanatory diagram for explaining an optimum offset value set by the focus control method shown in FIG. 9. FIG.
13 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 diagram for generating recording data to be recorded on an optical disc. It is a figure explaining a method.
FIG. 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 explaining an ECC error detection method used when detecting an error amount of data by the focus control method shown in FIG. 8, and shows an example of a defect information management zone of an optical disc. It is.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 100 ... Optical disk (high density optical recording medium), 210 ... Semiconductor laser, 220 ... Optical lens for condensing, 230 ... Half mirror, 250 ... Objective lens, 260 ... Light receiving element (detector), 303, 304 ... Adder circuit, 311 ... Subtraction circuit, 313, 316 ... D / A, 314 ... Adder, 317 ... Analog switch SW, 351 ... Binarization circuit, 352 ... Jitter measurement circuit, 354 ... Data demodulation circuit, 361 ... PLL phase error detection circuit, 362 ... Integral circuit, 363 ... Comparison circuit, 400 ... Microcomputer, 800 ... Two-dimensional actuator control circuit.

Claims (18)

  A recording surface of 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, and a defect information management zone of the optical information recording medium The focus control method of the optical disc apparatus for recording or reproducing information while controlling the focus position of the optical reproducing means in conformity with the land area and the groove area, respectively, The focus position of the optical reproducing means 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. The focus control method for an optical disc apparatus is characterized in that recording or reproduction is performed.   Optical information 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 and a drive test zone of an optical information recording medium A focus control method of 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 in conformity with each of the land area and the groove area, the defect information When the management zone has not been recorded, the pit address area is reproduced and the focus of the optical reproduction means in the land area and groove area is minimized so that the error amount of data demodulated from the pit address signal is minimized. Set the position, record information in the drive test zone, and then play back the recording section. The focus position of the optical reproduction means in the land area and 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, and information is stored in the defect information management zone. Is recorded, the focus position of the optical reproducing means in the land area and groove area is reproduced by reproducing the signal recorded in the defect information management zone and demodulating from the signal jitter amount or the signal. A focus control method for an optical disc apparatus, wherein information is recorded or reproduced by setting the data error amount to a minimum.   An optical information recording medium comprising a ROM area comprising concave and convex pits, a RAM area comprising land areas, groove areas and pit address areas, and comprising 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 on a recording surface while controlling a focus position of an optical reproducing means in conformity with the land area and the groove area, wherein the defect information management zone If not recorded, after reproducing the ROM area and setting the focus position of the optical reproducing means so that the jitter amount of the reproduced signal or the error amount of data demodulated from the reproduced signal is minimized The information is recorded and reproduced in the land area and groove area using the drive test zone, and the reproduction signal is reproduced. The focus position of the optical reproducing means in the land area and groove area is set so that the jitter amount of the data or the error amount of the data demodulated from the reproduced signal is minimized, and 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, the signal recorded in the defect information management zone is reproduced, and the jitter amount of the signal or the error of the data demodulated from the signal is reproduced. A focus control method for an optical disc apparatus, wherein information is recorded or reproduced by setting the amount to be a minimum.   An optical information recording medium comprising a ROM area comprising concave and convex pits, a RAM area comprising land areas, groove areas and pit address areas, and comprising 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 on a recording surface while controlling a focus position of an optical reproducing means in conformity with the land area and the groove area, wherein the defect information management zone If not recorded, the ROM area is reproduced and the focus position of the optical reproduction means is set to a value that allows the reproduction data to be reproduced correctly, or the focus position can reproduce the reproduction data correctly. After confirming that the value is set to a correct value, the land area is determined using the drive test zone. The optical reproduction means in the land area and the groove area so that the jitter amount of the reproduction signal or the error amount of data demodulated from the reproduction signal is minimized. When the focus position is set and information is recorded in the defect information management zone, the focus position of the optical reproducing means in the land area and groove area is reproduced and the signal recorded in the defect information management zone is reproduced. A method for controlling the focus of an optical disc apparatus, wherein information is recorded or reproduced by setting the jitter amount of the signal or the error amount of data demodulated from the signal to be minimized.   5. The focus control method for an optical disc apparatus according to claim 1, wherein a reproduction track used when the focus position is set in the defect information management zone or the drive test zone is transmitted to tracks on both sides adjacent to the track. A focus control method for an optical disc apparatus, wherein:   5. The focus control method for an optical disc apparatus according to claim 1, wherein the jitter amount is obtained by binarizing the reproduction signal, detecting a PLL phase error, slicing at a predetermined level, and error pulses. A focus control method for an optical disc apparatus, characterized in that it is converted into an error pulse and counted by the number of error pulses.   5. The focus control method for an optical disc device according to claim 1, wherein the data error amount is counted by an ECC error number (PI error or PO error) when demodulating the reproduction signal. Focus control method for optical disc apparatus.   3. The focus control method for an optical disc apparatus according to claim 2, wherein the pit address includes four PIDs (pit addresses) per sector, and an error amount of data demodulated from the pit address signal is calculated as follows: A focus control method for an optical disc apparatus, characterized in that the number of errors for four PIDs is counted.   8. The focus control method for an optical disc apparatus according to claim 5 or 7, wherein the defect information management zone is divided into eight ECC blocks, and the first block of DMA1 in order from the inner periphery of the information recording medium, The second block, the first block of reserve, the second block, the first block of DMA2, the second block, the first block of reserve, the second block, and the groove area using the first block of reserve of the third block And a focus position setting for a land area using the first block of the fifth DMA 2 is performed.   A recording surface of 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, and 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 in each of the land area and groove area, and a jitter measuring means for measuring a jitter amount of a reproduced signal, or reproducing A data error measuring means for measuring an error amount of data demodulated from the signal, the jitter amount of the signal recorded in the defect information management zone or the data demodulated from the reproduction signal recorded in the defect information management zone; The focus position of the optical reproducing means for the land area and groove area is set so that the error amount is minimized. Optical disk apparatus characterized by comprising a control means.   Optical information 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 and a drive test zone of an 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 groove area, respectively, wherein the focus position is set in the land area and groove area A focus position setting means for setting the defect information, a detection means for detecting whether the defect information management zone is unrecorded or recorded, and reproducing the pit address area to measure a data error amount in the pit address portion. PID error measuring means, recording means for recording information in the drive test zone, reproduction signal Jitter measuring means for measuring the amount of jitter, or data error measuring means for measuring the error amount of data demodulated from the reproduction signal, and when the detecting means determines that the defect information management zone is unrecorded, The focus position setting means sets the focus position of the groove area and land area so that the error amount measured by the PID error measurement means is minimized, the recording means records in the drive test zone, and the recording is performed. The jitter amount or the data error amount of the reproduction signal from the unit is measured by the jitter measuring means and the data error measuring means, and the focus position of the optical reproducing means in the land area and the groove area so that the amount is minimized. And a control means for setting the defect information management zone and the detection means determine 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 is measured by the jitter measuring unit and the data error measuring unit, and the land region and the groove region are optically controlled so that the amount is minimized. An optical disc apparatus comprising: control means for setting a focus position of a reproducing means.   An optical information recording medium comprising a ROM area comprising concave and convex pits, a RAM area comprising land areas, groove areas and pit address areas, and comprising a defect information management zone and a drive test zone of the optical information recording medium An optical disk apparatus for recording or reproducing information by setting a focus position of an optical reproducing means on the recording surface to the land area and the groove area, respectively, and setting the focus position to the land area and the groove area, respectively. A focus position setting means for detecting, a detecting means for detecting whether the defect information management zone is unrecorded or recorded, and a ROM section error for reproducing the ROM area and measuring a data error amount of the ROM section Measuring means, recording means for recording information in the drive test zone, and measuring the jitter amount of the reproduction signal. Jitter measurement means or data error measurement means for measuring an error amount of data demodulated from a reproduction signal, and when the detection means determines that the defect information management zone is unrecorded, the ROM unit error measurement The focus position is set so that the error amount measured by the means is minimized, and recording is performed in the drive test zone by the recording means, and the jitter amount or data error amount of the reproduction signal from the recording unit is measured. Control means for setting the focus position of the optical reproduction means for the land area and the groove area so that the amount is minimized, and the detection means is the defect information management zone. Is determined to have been recorded, the jitter amount or data error amount of the signal set in the defect information management zone is set in advance. Jitter measuring means and control means for setting the focus position of the optical reproducing means for the land area and groove area so as to minimize the amount measured by the data error measuring means. Optical disk device.   An optical information recording medium comprising a ROM area comprising concave and convex pits, a RAM area comprising land areas, groove areas and pit address areas, and comprising a defect information management zone and a drive test zone of the optical information recording medium An optical disk apparatus for recording or reproducing information by setting a focus position of an optical reproducing means on the recording surface to the land area and the groove area, respectively, and setting the focus position to the land area and the groove area, respectively. Focus position setting means, detection means for detecting whether the defect information management zone is unrecorded or recorded, and data for reproducing the ROM area and confirming that the data in the ROM section can be reproduced correctly Reproduction confirmation means; recording means for recording information in the drive test zone; Jitter measuring means for measuring the amount of data, or data error measuring means for measuring an error amount of data demodulated from the reproduction signal, and when the detecting means determines that the defect information management zone is unrecorded, Set to a focus position at which data can be correctly reproduced by the data reproduction confirmation means of the ROM section, or confirm that it has already been set, record in the drive test zone with the recording means, and reproduce signals from the recording section Control means for measuring the jitter amount or data error amount of the optical signal 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. And when the detection means determines that the defect information management zone has been recorded, the defect information management zone is set. Control for setting the focus position of the optical reproduction means in the land area and the groove area so that the jitter amount or the data error amount of the signal is measured by the jitter measuring means and the data error measuring means and the amount is minimized. And an optical disc apparatus.   14. The optical disc apparatus according to claim 10, wherein a reproduction track used when setting the focus position in the defect information management zone or the drive test zone has a signal recorded on both tracks adjacent to the track. An optical disc apparatus characterized by being set to be   14. The optical disk device according to claim 10, wherein the jitter measuring means includes a binarizing means for binarizing a reproduction signal from the optical information recording medium, and an output signal from the binarizing means. A PLL phase error detecting means for detecting a phase error of the PLL from the error, an error pulse converting means for integrating the output from the PLL phase error detecting means and slicing it at a predetermined level to convert it into an error pulse, and the error An optical disc apparatus comprising jitter error pulse counting means for counting pulses.   14. The optical disk apparatus according to claim 10, wherein the data error measuring means is ECC error counting means for counting the number of ECC errors (PI error or PO error) when demodulating the reproduction signal. An optical disc device characterized. 12. The optical disk device according to claim 11 , wherein the PID error measuring means is a PID error counting means for counting the number of errors for four PIDs (pit addresses) per sector. apparatus.   The optical disk apparatus according to claim 14 or 16, wherein the defect information management zone includes a first block of DMA1, a second block, a first block of reserve, a second block, in order from an inner periphery of the information recording medium. When the DMA block is divided into a total of eight ECC blocks including the first block, the second block, the first block of the reserve, and the second block, the focus position of the third block is set for the focus position of the groove area. An optical disc apparatus characterized in that one block is used and the focus position of the land area is set using the first block of the fifth DMA2.

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