JP2002197672A - Optical disk and optical disk recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk having high reliability by preventing prepit signals from generating noise by forming the prepit around the inner peripheral side wall surfaces of land regions in order to avert the molding defect which arises on the inner peripheral side wall surfaces. SOLUTION: The optical disk having the land regions and groove regions in a spiral or approximately circumferential form has recording film layers 21 for recording prescribed information by being irradiated with a laser beam from outside and prepit regions where the prepit regions POUT1 formed on the outer peripheral side wall surfaces of the land regions have the higher recording density than the prepit regions PIN1 formed on the inner peripheral wall surfaces.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk, and more particularly to an optical disk having prepits on the outer peripheral side wall surface of a land area having a higher recording density than those on the inner peripheral side wall surface.

[0002]

2. Description of the Related Art Recently, the performance of optical disks has been remarkably improved, and various types of optical disks have been developed and manufactured, and these optical disks have become widespread. For example, DVD-RAM (Digital Vers
For writable optical disks such as atileDisk-Random Access Memory), create a substrate with a flat mirror surface and a surface to which a recording pattern or groove structure is transferred, and form a recording film or reflective film on the signal recording surface by sputtering or other methods After that, recording and reproduction of signals are performed by making laser light-light incident from the mirror surface side. In this case, in consideration of productivity, the substrate is often formed by injection molding using a transparent resin such as polycarbonate.

However, with the recent increase in the density of optical disks, it has become difficult to mold substrates. In particular, it is difficult to transfer a groove structure generally employed in a writable optical disk to a molded substrate without causing molding defects. Above all, a horn-shaped molding defect appearing on the land side wall portion is a serious problem as a molding defect that frequently occurs.

[0004] This molding failure is caused by a transfer error due to a large difference in the degree of shrinkage between the stamper and the resin during the cooling process during molding, and an oblique position of the stamper due to the position of the air outlet when the mold substrate is released from the air. A mold release defect that is peeled off from a molded substrate is a major cause of occurrence. Accordingly, as the density of the optical disk increases, the land portion becomes narrow, and it becomes difficult to release the molding substrate from the mold, and the mold temperature during molding increases. It's getting easier.

On the other hand, when address information is recorded on a substrate in advance in the form of pre-pits or the like on a writable optical disk, the land surface of the land is not adversely affected so as to improve the recording density and not to adversely affect the reproduction of the written information. It is conceived to embed notched pre-pits in the holes.

Japanese Patent Application Laid-Open No. H11-250462 discloses a technique similar to the above technique in which an optical disk having a land area and a groove area is provided with address information in a part of the land area. In this publication, a wobble is formed in a land area, and address information is made to correspond to the presence or absence of a wobble to specify an address of each area in the disk. (However, unlike the present invention, this technique uses pre-pits. It will not be provided,
In addition, a recording density difference between the inner peripheral side wall surface and the outer peripheral side wall surface is not provided).

As described above, an optical disk having a land area and a groove area is generally provided with a structure which can be read by an optical laser or the like in order to give address information to a part of the land area.

[0008]

However, the pre-pit area formed corresponding to the address information is provided on the wall surface of the land, but the land wall surface is liable to cause molding defects such as horns as described above. By the way, when the pre-pits are buried therein, there is a problem that there is a danger that the pre-pits may be formed poorly and the reproduced signal may generate noise.

The present invention has been made in view of the above problems, and has
Focusing on the fact that molding defects on the land wall surface of a RAM or the like are concentrated on the inner peripheral wall surface of the land region, and forming prepits around the outer peripheral wall surface of the land region where molding defects are less likely to occur, An object of the present invention is to provide an optical disc capable of preventing generation of noise of a pre-pit signal during reproduction.

[0010]

According to a first aspect of the present invention, a land area and a groove area are spirally or substantially circumferentially formed, and predetermined information is recorded by externally irradiating a laser beam. An optical disc that can be provided on at least one of the land area or the groove area,
A recording film layer for recording predetermined information by being irradiated with a laser beam from the outside, and provided on both wall surfaces of the land area,
The prepit area provided on the outer peripheral side wall surface of the land area has a higher recording density than the prepit area provided on the inner peripheral side wall surface, and includes at least a prepit area where address information is recorded. It is an optical disc characterized by the following.

As described above, the present invention avoids the inner peripheral side wall surface of the land region where formation failure such as horns is likely to occur when forming the land region, and increases the number of prepit regions on the outer peripheral side wall surface of the land region. It is provided. As a result, it is possible to reduce the occurrence of noise or the like at the time of reading the address information or the like by the pre-pits, and thus it is possible to provide an optical disc with higher operation reliability.

According to a fifth aspect of the present invention, there is provided an optical disc recording apparatus for recording predetermined information by irradiating a laser beam to an optical disc having a land area and a groove area in a spiral or substantially circumferential shape. A recording film layer provided on at least one of the land area or the groove area and recording predetermined information by irradiating a laser beam from outside; and a recording film layer provided on both wall surfaces of the land area, and an outer periphery of the land area. The pre-pit area provided on the side wall surface has a higher recording density than the pre-pit area provided on the inner peripheral side wall surface, and holds an optical disk having at least a pre-pit area where address information is recorded. A rotating means for rotating the optical disk, and irradiating the pre-pit area of the optical disk rotated by the rotating means with a light beam; By emitting the light beam, an address information detecting means for detecting the address information of the optical disc, and a light beam is generated according to given information based on the address information of the optical disc detected by the address detecting means, and the light beam is generated. Recording means for recording predetermined information on the recording film layer of the optical disk by irradiating the recording film layer with the recording film layer.

As described above, the present invention avoids the inner peripheral side wall surface of the land region where formation failure such as generation of a horn is likely to occur, and forms a high recording density pre-pit region on the outer peripheral side wall surface to thereby generate noise. An optical disk recording apparatus that reads address information and the like by reading this pre-pit area on an optical disk that exhibits high reliability and reduces the amount of information, and specifies an optical disk recording apparatus that records predetermined information in a recording area based on the information.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an optical disk and an optical disk recording / reproducing apparatus according to the present invention will be described with reference to the drawings.
The embodiments described below are preferred specific examples of the present invention, but the scope of the present invention is not limited to these embodiments.

<Embodiment of Optical Disc According to the Present Invention> First, an embodiment of an optical disc according to the present invention will be described in detail with reference to various examples. FIG. 1 is a sectional view showing an embodiment of an optical disk according to the present invention, FIG. 2 is a plan view showing a prepit area of an embodiment of a recordable optical disk according to the present invention, and FIG. FIG. 4 is a plan view showing a pre-pit area according to an embodiment of a dedicated optical disk, and FIG. 4 is a conceptual diagram showing a state of a molding defect occurring during optical disk molding.

An optical disk D according to the present invention is shown as a cross-sectional view of a recordable optical disk. In FIG. 1, a reflective film layer 22 is provided on a molded substrate 24, and desired information is recorded thereon. A recording film layer 21 is provided;
A cover layer 20 having a thickness of 0.1 mm is formed thereon to protect the structure. In such a configuration, land prepits as shown in FIGS. 2 and 3 are provided in each signal recording area 23.

The land prepit according to the present invention has the following features.
DVD-R and DVD-R
Two cases of a read-only optical disk such as an OM (Read Only Memory) will be described.

The optical disk according to the present invention is characterized in that, when embedding prepits in a land portion, the density of the prepits is made higher on the land outer peripheral side wall surface than on the land inner peripheral side wall surface, or prepits are provided only on the land outer peripheral side wall surface. It is assumed that. By doing so, the original function of the pre-pit is maintained without being affected by molding defects such as horns which are likely to occur on the inner peripheral side of the land.

Next, referring to FIG. 4, a description will be given of a formation defect occurring on the inner peripheral side which is avoided by the present invention. Generally, a land is formed on a writable optical disk by recording a groove, but a sidewall portion of the land is liable to cause molding failure. There are two major causes.
First, in the cooling process at the time of molding, the degree of shrinkage of the resin is larger than that of the stamper. Therefore, as shown in FIG. This is a case where the molding remains poorly on the inner land wall. Secondly, as shown in FIG. 4 (b), when the mold is released from the mold substrate by air, the air ejection port must be provided on the inner periphery where there is no signal. This is a case where the horn due to a mold release defect appears on the inner peripheral side wall surface of the land because the molded substrate is peeled off. It can be seen that, regardless of the cause, the molding failure occurs concentrated on the inner peripheral side wall surface of the land.

When the pre-pits are embedded in the lands, the molding defects lead to deterioration of the pre-pit signal. Therefore, when embedding the pre-pits in the lands, the molding defects which are concentrated on the inner peripheral side wall surface of the lands are avoided. By making the density higher on the land outer peripheral side wall surface than on the land inner peripheral side wall surface, it is possible to produce an optical disc with less deterioration of the pre-pit signal even if molding failure occurs.

Hereinafter, an example in which the prepit region is provided concentrated on the outer peripheral side wall surface of the land will be described in detail with reference to FIGS.

FIG. 2A shows a recordable optical disk such as a DVD-RAM or the like. The prepits P _IN1 on the inner peripheral side wall surface of the land area are provided at a low recording density. Pre-pit P on the outer peripheral side wall of the region
_It can be seen from the figure that _OUT1 is provided at a higher recording density. As a result, the influence of poor formation of horns and the like, which are likely to occur on the inner peripheral side, is avoided.

In the case of FIG. 2B, in order to completely avoid the influence of the formation defect on the inner peripheral side, the pre-pit P _OUT2 is
It is provided only on the outer peripheral side wall surface. This allows
Noise countermeasures can be taken when reading higher pre-pit information.

FIG. 3A shows a case of an optical disk such as a read-only DVD-ROM.
Similarly, the prepits P _IN3 on the inner peripheral side wall surface are formed at a lower recording density than the prepits P _OUT3 on the outer peripheral side wall surface, thereby reducing the influence of defective formation.

Similarly, in FIG. 3B, in order to completely avoid the influence of the formation failure on the inner peripheral side, the pre-pit P
_OUT4 is provided only on the outer peripheral side wall surface. This makes it possible to take measures against noise when reading higher pre-pit information.

As described above, according to the optical disk of the present invention, it is necessary to previously record address information on the substrate in the form of pre-pits on a writable optical disk. For the purpose of not adversely affecting the reproduction of information, it is considered that the prepits are embedded in notches on the wall surfaces of the lands. However, as described above, since molding defects are concentrated on the inner peripheral side wall surface, if the prepits are embedded in the inner peripheral side wall surface, the prepits cause molding defects, and the prepit signal deteriorates during reproduction.

Therefore, in the present invention, when embedding the pre-pits on the land wall surface, the pre-pits are embedded on the outer peripheral side wall surface as shown in FIGS. As a result, even if molding failure occurs due to molding shrinkage or mold release failure on the inner peripheral side wall surface of the land, molding failure does not occur in the pre-pit portion and deterioration of the pre-pit reproduction signal can be prevented. Can be provided.

<One Example of the Method for Manufacturing an Optical Disk According to the Present Invention> The method for manufacturing an optical disk according to the present invention will be described below in detail with reference to the drawings. FIG. 5 is an explanatory diagram for explaining a manufacturing process of the optical disc according to the present invention.

In the illustration of FIG. 5, first, a glass master 61 is prepared in order to generate a stamper for molding the substrate 24 of the optical disk D1 shown in FIG. 2 (S
1). Next, a photoresist is applied on the glass master 61 (S2). Then, the laser beam 64
By exposing this, an information pattern is recorded on the glass master 61 (S3). After the exposure, a development process is performed (S
4) A stamper 62 mainly made of nickel is prepared (S5). The stamper 62 has irregularities corresponding to the signal, and the signal can be transferred onto the substrate by attaching the stamper to the mold 63 during injection molding and forming the substrate (S6). The resin used at this time is generally a transparent resin excellent in cost and strength such as polycarbonate.

Next, a reflective film layer 22 is formed on the substrate 24 thus formed by a sputtering method or the like using a sputtering apparatus (S7). Further, the recording film layer 21
Is formed (S8). Further, a cover sheet is prepared by a casting method or the like (S9). Further, a cover sheet 20 having a thickness of 0.1 mm is adhered on the recording film layer 21 (S1).
0). At this time, the cover sheet is generally made of a resin having excellent optical properties by a casting method or the like, and the bonding is generally performed with an adhesive or an ultraviolet curable resin. Alternatively, a 0.1 mm cover layer may be formed by applying an ultraviolet curing resin. In any case, the cover layer is required to have uniform optical properties and thickness.

It is needless to say that the step of forming a recording film in step S8 is not necessary for a read-only disk such as a DVD-ROM.

2 and 3 by the above-described manufacturing method.
Is manufactured, but this manufacturing method is merely an example, and various methods are possible according to the technical level of those skilled in the art.

<Optical Disk Recording / Reproducing Apparatus According to the Present Invention>
Next, an optical disk recording / reproducing apparatus using the optical disk according to the present invention will be described in detail with reference to the drawings. FIG. 6 is a block diagram of an optical disk recording / reproducing apparatus using the optical disk according to the present invention. In FIG. 6, an optical disk recording / reproducing apparatus 130 according to the present invention includes an optical disk (DVD-RAM, DVD-ROM) D1 according to the present invention.
D4 to perform data recording or data reproduction.

The optical disk recording / reproducing apparatus 130 includes the optical pickup (optical head) 102 for irradiating a light beam to the storage area of the optical disk according to the present invention.

When the optical disks D1 to D4 are loaded into the optical disk recording / reproducing device 130, the optical head
2 and the data processing unit 106, the optical disk D
The control information of the optical discs D1 to D4 recorded in the control data zone in the emboss data zone of the lead-in area of the lead-in areas 1 to D4 is read, and the CPU described later
125.

In the optical disk recording / reproducing apparatus 130 of the present invention, the CPU 12 is operated on the basis of the operation information by the user operation, the control information of the optical disk D recorded in the control data zone in the optical disk, the current status, and the like.
Under the control of 5, the laser beam is generated by being energized by the laser control unit 105.

The generated laser beam is applied to the objective lens 10.
3 and irradiates the recording area of the disk. As a result, data is written to the storage areas of the optical discs D1 to D4 (generation of a mark sequence: data is recorded on the optical discs D1 to D4 according to the intervals between the marks of variable length and the lengths of the marks of variable length. ) Alternatively, a reflected wave corresponding to the stored data is reflected and detected, and the data is reproduced.

The setting of the laser control unit 105 is set by the data processing unit 106. The setting differs depending on the reproduction power for obtaining a reproduction signal, the recording power for recording data, and the erasing power for erasing data. . The laser beam has three different levels of power, reproduction power, recording power and erasing power, and the semiconductor laser unit is energized by the laser control unit 105 to generate a laser beam of each power. You.

For example, the laser control unit 105
A power supply voltage is applied to a resistor, a transistor, and a semiconductor laser as a semiconductor laser unit. As a result, the amplification factor differs depending on the base current of the transistor, and different currents flow through the semiconductor laser oscillator to generate laser beams having different intensities. That is, a laser power corresponding to the signal level of the recording waveform from the recording waveform generation circuit 145 described later is generated.

The optical disk D faces the objective lens 103.
The optical discs D1 to D4 are arranged so that
4 is transported into the apparatus by the tray 107 directly or stored in the disk cartridge 101a. A tray motor 108 for driving the tray 107 is provided in the apparatus. Also, the loaded optical disk D1
To D4 are rotatably held on a spindle motor 110 by a clamper 109, and are rotated by the spindle motor 110.

The optical pickup 102 has a photodetector (not shown) for detecting a laser beam therein.
This photodetector detects the laser beam reflected by the optical disks D1 to D4 and returned via the objective lens 103. A detection signal (current signal) from the photodetector is converted into a voltage signal by a current / voltage converter (I / V), and this signal is supplied to a preamplifier (RF amplifier) 113 and a servo amplifier 114. From the preamplifier 113, a signal for reproducing data in the header portion and a signal for reproducing data in the recording area are output to the DVD data processing unit 106. The servo signals (track error signal and focus error signal) from the servo amplifier 114 are output to the servo seek control unit 115.

Here, as a method of optically detecting the amount of defocus, there is, for example, the following method.

[Astigmatism Method] An optical element (not shown) for generating astigmatism is arranged on a detection optical path of laser light reflected by the light reflecting film layer or the light reflecting recording film of the optical discs D1 to D4. This is a method of detecting a change in the shape of laser light irradiated on a photodetector. The light detection area is 4 diagonally
Has been split. The difference between the diagonal sums of the detection signals obtained from the respective detection areas is calculated in the DVD servo seek control unit 15 to obtain a focus error detection signal (focus signal).

[Knife Edge Method] Optical Disks D1 to D
This is a method of arranging a knife edge that asymmetrically shields a part of the laser light reflected by the laser light. Light detection area is 2
The focus error detection signal is obtained by taking the difference between the detection signals obtained from the divided detection areas.

Usually, either the astigmatism method or the knife edge method is employed.

Each of the optical disks D1 to D4 has a spiral or concentric track, and information is recorded on the track. Information is reproduced or recorded / erased by tracing the converged spot along this track. In order to stably trace the focused spot along the track, it is necessary to optically detect the relative displacement between the track and the focused spot.

The following method is generally used as a track shift detecting method. [Differential Phase Detection Method]
A change in the intensity distribution of the laser light reflected by the light reflecting film layers or the light reflecting recording films of the optical disks D1 to D4 on the photodetector is detected. The light detection area is divided into four on a diagonal line. The DVD servo seek control unit 15 calculates the phase difference between the diagonal sums of the detection signals obtained from the respective detection areas to obtain a track error detection signal (tracking signal).

[Push-Pull Method] A change in the intensity distribution of the laser light reflected by the optical disks D1 to D4 on the photodetector is detected. The light detection area is divided into two,
The difference between the detection signals obtained from the respective detection areas is obtained to obtain a track error detection signal.

[Twin-Spot Method] A diffractive element or the like is arranged in a light transmission system between the semiconductor laser device and the optical disks D1 to D4 to divide the light into a plurality of wavefronts and irradiate the light onto the optical disks D1 to D4. A change in the amount of reflected ± 1st-order diffracted light is detected. +1 separately from the light detection area for detecting the reproduction signal
A light detection area for individually detecting the reflected light amount of the second-order diffracted light and the reflected light amount of the -1st-order diffracted light is arranged, and a difference between the respective detection signals is obtained to obtain a track error detection signal.

In the DVD mode, a focus signal, a tracking signal, and a feed signal are sent from the DVD servo seek control unit 115 to a focus / tracking actuator driver and a feed motor driver 117, and the objective lens 103 is subjected to focus servo control by the driver 117. Further, tracking servo control is performed.

Further, the driver 11 responds to the access signal.
The urging signal is supplied from 7 to the feed motor 111 to control the transport of the optical pickup 102.

This servo seek control unit 115
Controlled by the data processing unit 106. For example, an access signal is supplied from the data processing unit 106 to the servo seek control unit 115 to generate a feed signal.

The spindle motor driver 118 and the tray motor driver 119 are controlled by control signals from the data processing unit 106, and the spindle motor 11
0 and the tray motor 108 are energized, the spindle motor 110 is rotated at a predetermined speed, and the tray motor 108 is rotated.
Will properly control the tray.

A reproduced signal corresponding to the data of the header supplied to the data processing unit 106 is supplied to a CPU (to be described later).
125. Thereby, the CPU 125
Determines the sector number as an address of the header part based on the reproduced signal, and compares it with the sector number as an address to access (record data or reproduce recorded data). .

As for the reproduction signal corresponding to the data of the recording area supplied to the data processing unit 106, necessary data is stored in the RAM 120, and the reproduction signal is processed by the data processing unit 106 and the RAM 12 as a buffer is processed.
The reproduction control signal is supplied to the interface control unit 122 having the number 1 and an external device such as a personal computer, for example.

As described above, according to the optical disk recording / reproducing apparatus, it is possible to record or reproduce data in / from each storage area on the optical disk according to the present invention.

[0057]

As described above, according to the present invention, in an optical disk having a land area and a groove area, prepits on the inner peripheral side wall surface of a land where formation failure is liable to occur are avoided, and the prepit is focused on the outer peripheral side wall surface. By forming a high recording density, it is possible to eliminate the noise and the like due to the influence of the formation failure of the inner peripheral side wall surface, thereby improving the problems such as the misrecognition of the pre-pit signal, and producing an optical disk with higher operation reliability. Can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of an optical disk according to the present invention.

FIG. 2 is a plan view showing a pre-pit area of one embodiment of the recordable optical disc according to the present invention.

FIG. 3 is a plan view showing a pre-pit area of a read-only optical disc according to an embodiment of the present invention.

FIG. 4 is a conceptual diagram showing a state of molding failure occurring during molding of an optical disk.

FIG. 5 is an explanatory view illustrating a manufacturing process of the optical disc according to the present invention.

FIG. 6 is a block diagram showing an embodiment of an optical disk recording / reproducing apparatus according to the present invention.

[Explanation of symbols]

_{DESCRIPTION OF SYMBOLS} 20 ... Cover sheet 21 ... Recording film layer 22 ... Reflective film layer 23 ... Signal recording area 24 ... Molded substrate P ... Pit _PIN1 ... _{Prepit on} the first inner peripheral side wall _POUT1 ... Prepit P on the first outer peripheral side wall surface _IN2 : _Pre- pits on the second inner peripheral side wall P _OUT2 ... _Pre- pits on the second outer peripheral side wall P _IN3 ... _Pre- pits on the third inner peripheral side wall P _OUT3 ... _Pre- pits on the third outer peripheral side wall P _IN4 ... Fourth _Pre- pits on the inner peripheral side wall P _OUT4 … _Pre- pits on the fourth outer peripheral side wall

Claims (8)

[Claims] 1. An optical disk having a land area and a groove area in a spiral or substantially circumferential shape and capable of recording predetermined information by irradiating a laser beam from outside, wherein the land area or the groove is provided. A recording film layer provided on at least one of the regions and recording predetermined information by being irradiated with a laser beam from the outside; provided on both wall surfaces of the land region; provided on an outer peripheral wall surface of the land region. An optical disc, characterized in that the pre-pit area has a higher recording density than the pre-pit area provided on the inner peripheral side wall surface and has at least a pre-pit area in which address information is recorded. 2. An optical disk having a land area and a groove area spirally or substantially circumferentially and capable of recording predetermined information by irradiating a laser beam from the outside, wherein the land area or the groove is provided. A recording film layer that is provided on at least one of the regions and records predetermined information by being irradiated with a laser beam from the outside; and an outer peripheral wall surface of the land region that is not provided on an inner peripheral wall surface of the land region. And a pre-pit area in which at least address information is recorded. 3. An optical disc having a land area and a groove area spirally or substantially circumferentially and capable of reproducing predetermined information by irradiating a laser beam from the outside, wherein the optical disk comprises: A prepit area provided on a wall surface and having a higher recording density than a prepit area provided on an outer peripheral side wall surface of the land area has a higher recording density than a prepit area provided on an inner peripheral side wall surface. An optical disc, comprising: 4. An optical disc having a land area and a groove area spirally or substantially circumferentially and capable of reproducing predetermined information by irradiating a laser beam from the outside, wherein: An optical disc, comprising: a pre-pit area which is not provided on the peripheral side wall surface but is provided only on the outer peripheral side wall surface of the land area and at least address information is recorded. 5. An optical disk recording apparatus for recording predetermined information by irradiating a laser beam to an optical disk having a land area and a groove area in a spiral or substantially circumferential shape, wherein the land area or the groove area is A recording film layer provided on at least one side and recording predetermined information by irradiating a laser beam from the outside; and a prepit area provided on both wall surfaces of the land area and provided on an outer peripheral wall surface of the land area. Has a higher recording density than a pre-pit area provided on the inner peripheral side wall surface, holds an optical disk having at least a pre-pit area where address information is recorded, and rotates means for rotating at a predetermined number of rotations; By irradiating a light beam onto the pre-pit area of the optical disk being rotated by the rotating means and detecting the reflected wave, the optical data is obtained. Address information detecting means for detecting address information of a disc; and generating a light beam according to given information based on the address information of the optical disk detected by the address detecting means, and irradiating the light beam to the recording film layer. By doing
An optical disk recording apparatus, comprising: recording means for recording predetermined information on the recording film layer of the optical disk. 6. An optical disk recording apparatus for recording predetermined information by irradiating a laser beam to an optical disk having a land area and a groove area in a spiral or substantially circumferential shape, wherein the optical disk has a land area and a groove area. A recording film layer provided on at least one side and recording predetermined information by being irradiated with a laser beam from the outside, and not provided on the inner peripheral side wall surface of the land region, but only on the outer peripheral side wall surface of the land region A rotating means for holding an optical disk having at least a pre-pit area in which address information is recorded, and rotating the optical disk at a predetermined number of rotations; and only on an outer peripheral side wall surface of the land area of the optical disk being rotated by the rotating means. An address for detecting the address information of the optical disk by irradiating a light beam to the provided pre-pit area and detecting the reflected wave. A scan information detector, by irradiating the basis of the address detecting means address information of the optical disc is detected, generates a light beam in accordance with a predetermined information given it to said recording layer,
An optical disk recording apparatus, comprising: recording means for recording predetermined information on the recording film layer of the optical disk. 7. An optical disc reproducing apparatus for reading predetermined information recorded by irradiating a laser beam onto an optical disc having a land area and a groove area in a spiral or substantially circumferential shape, and reproducing the read information. The pre-pit regions provided on both wall surfaces of the land region and provided on the outer peripheral side wall surface of the land region have a higher recording density than the pre-pit regions provided on the inner peripheral side wall surface, and at least address information is recorded. Rotating means for holding an optical disc having a pre-pit area to be rotated at a predetermined number of revolutions, provided on a pre-pit area or an inner circumferential side wall face provided on the outer peripheral side wall face of the optical disc being rotated by the rotating means. At least one of the pre-pit areas is irradiated with a light beam, and the reflected wave is detected. Reads the predetermined information that has been broadcast and stored, the optical disk reproducing apparatus characterized by comprising a reproducing means for reproducing the same. 8. An optical disk reproducing apparatus for reading predetermined information recorded by irradiating a laser beam on an optical disk having a land area and a groove area in a spiral or substantially circumferential shape, and reproducing the read information. Rotating means for holding an optical disc having a pre-pit area in which at least address information is recorded and not provided on the inner peripheral side wall surface of the land area, but provided only on the outer peripheral side wall face of the land area, and rotating at a predetermined number of revolutions Irradiating a light beam to a pre-pit area provided on the outer peripheral side wall surface of the optical disk being rotated by the rotating means, and detecting the reflected wave to obtain address information of the optical disk and a predetermined stored information. An optical disc reproducing apparatus, comprising: reproducing means for reading information and reproducing the information.