JP3294782B2 - Optical disk access method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk access method and an optical disk device, and more particularly, to an optical disk device for recording video signals and audio signals at high density. The present invention has a diameter of 120 [m
m], and a working distance of 560 for an optical disc whose light transmission layer is set to a thickness of 10 to 177 [μm].
[Μm] The shortest pit length or the shortest mark length 0.3 [μm] through an optical system having a numerical aperture of 0.78 or more set to be equal to or less than [μm].
By recording a desired video signal and audio signal in the following, it is possible to record a program for a long time to the extent that the characteristics of the optical disk can be effectively used.

[0002]

2. Description of the Related Art Conventionally, a DVD (Digital Versat) has been used as an optical disk device for recording information at a high density.
ile Disc) has been proposed. This DVD is
The optical disk is irradiated with a laser beam having a wavelength of 650 [nm] by an optical system having a numerical aperture of 0.6, and 2.6 [G]
B] can be recorded, whereby about one hour of a video signal can be recorded on one side.

[0003]

However, in a home video tape recorder, the basic recording time is two hours, so that the same convenience as that of a video tape recorder can be ensured by an optical disk device. Must be recordable. In addition, in order to effectively execute various processes such as editing using a random access function or the like which is a feature of the optical disk, it is necessary to record a program for about 3 hours. In this case DVD
With reference to the system, it is necessary to set about 8 GB of data to be recordable.

The present invention has been made in view of the above points, and will propose an optical disk access method and an optical disk apparatus capable of recording a program for a long time to the extent that the characteristics of the optical disk can be effectively used. It is assumed that.

[0005]

According to the present invention, in order to solve such a problem, the diameter of the light transmitting layer is 120 [mm].
A first aspheric lens having a working distance of 560 [μm] or less, a numerical aperture of 0.78 or more, and emits a laser beam emitted from a laser light source as a converged light beam for an optical disk of 0 to 177 [μm]. A second aspherical lens having a substantially flat surface opposite to the information recording surface and having a smaller diameter than the first aspherical lens for condensing a laser beam of a converged light beam on the information recording surface; A video signal and an audio signal by an optical system having a member surrounding the second aspheric lens, the information recording surface of which is set to be substantially flat with the surface of the second aspheric lens on the information recording surface side. Record the data.

Further, the present invention is applied to an optical disk device for accessing the same optical disk, an optical disk device for accessing various optical disks, and an optical disk access method, and the rotational speed of the optical disk is gradually and stepwise changed according to the laser beam irradiation position. When changing the information recording surface into a plurality of concentric areas and recording the desired data so that the recording densities in each area are substantially equal, the desired data is recorded in a predetermined recording target area. After that, when the data recorded on the optical disc is reproduced by switching the area, the data recorded on the optical disc is reproduced while the rotation speed of the optical disc is kept at the rotation speed corresponding to the recording target area.

[0007] Diameter 120 [mm], light transmitting layers 10 to 17
A first aspheric lens having a working distance of 560 [μm] or less, a numerical aperture of 0.78 or more, and emitting a laser beam emitted from a laser light source with a converged light beam for an optical disk of 7 [μm]; A second aspherical lens having a surface opposite to the information recording surface formed by a substantially flat surface and having a diameter smaller than that of the first aspherical lens for condensing a laser beam by a converged light beam on the information recording surface; 2
A video signal and an audio signal are recorded by an optical system having a member surrounding the second aspheric lens, the information recording surface of which is set to be substantially flat with the surface of the aspheric lens on the information recording surface side. Then, a desired video signal and audio signal can be recorded at a high density, a capacity of about 8 [GB] can be secured, and a program of about 3 hours at the maximum can be recorded. As a result, a long-time program can be recorded to such an extent that the characteristics of the optical disk can be effectively used.

The information recording surface is divided into a plurality of concentric areas by sequentially changing the rotation speed of the optical disk in accordance with the laser beam irradiation position so that the recording densities in the respective areas become substantially equal. If desired data is recorded, high-density recording can be performed by effectively utilizing the information recording surface. In this case, after data is recorded in a predetermined recording target area, if the data recorded on the optical disc is reproduced while maintaining the rotation speed of the optical disc at the rotation speed corresponding to the recording target area, the optical disc can be reproduced. The time required for switching the rotation speed can be omitted, and the recording / reproducing operation can be switched only by the waiting time required for locking the PLL circuit or the like which is much shorter than the switching of the rotation speed. .

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings.

(1) First Embodiment (1-1) Configuration of First Embodiment FIG. 2 is a block diagram showing a mastering device according to a first embodiment of the present invention. In the manufacturing process of the optical disk according to this embodiment, the master disk 2 is exposed by the mastering device 1 and an optical disk is manufactured from the master disk 2.

Here, in the mastering apparatus 1, the master disc 2 is formed by applying a resist on a surface of a glass substrate, for example, and is rotationally driven by a spindle motor 3 at a constant angular velocity.

The optical head 4 irradiates the laser beam L onto the disk master 2 while being sequentially displaced from the inner circumference to the outer circumference side of the disk master 2 in synchronization with the rotation of the disk master 2 by a predetermined thread mechanism. I do. Thus, the optical head 4 forms a spiral track on the outer peripheral side from the inner peripheral side of the master disc 2. At this time, the optical head 4 is controlled by a thread mechanism so as to be displaced by about 1.0 [μm] in a cycle of the disk master 2 making one rotation.
The track is formed by 5 [μm]. The track pitch in the case of this land-groove recording is a track pitch of 0.74 [μ
m] is 1.48 times.

Thus, the mastering apparatus 1 records desired data at a linear recording density of about 0.21 [μm / bit] on the optical disk produced by the master disk 2, and obtains the following equation from the following relational expression. Data of a capacity of 8 GB or more can be recorded on this optical disc.

[0014]

(Equation 1)

Here, the numeral 4.7 is the recording capacity [GB] of the DVD, and is the numeral 0.74 and the numeral 0.267.
Is the track pitch [μm] and the linear recording density [μm / bit] of the DVD. Therefore, in equation (1),
This indicates the recording capacity by the same data processing as the DVD.

Further, at this time, when an optical disk is produced from the master disk 2, the optical head 4 makes a groove formed by exposure to the laser beam L substantially equal to a land width between adjacent grooves. Then, the spot diameter of the laser beam L is set. Here, the spot shape and light amount of the laser beam are set so that the effective exposure range by the laser beam increases by about 120% with respect to the width of the groove as the final target. As a result, the optical head 4 can
The master disc 2 is exposed so that the optical disc created by the above-mentioned method can perform land / groove recording.

Further, the optical head 4 is configured such that the optical system is movable in the radial direction of the master disc 2.

The drive circuit 5 drives the optical head 4 according to the drive signal SD. At this time, the drive circuit 5 switches the driving conditions of the optical head 4 in accordance with the laser beam irradiation position at a timing synchronized with the rotation of the disk master 2, thereby zoning the disk master 2 as shown in FIG. I do. In FIG. 3, the description of the grooves and pits is simplified.

That is, in the mastering apparatus 1, in an optical disk having a diameter of 120 [mm] equal to that of a compact disk, an area having a radius of 24 [mm] to 58 [mm] is sequentially set on the disk master 2 so as to set the area as an information recording surface. Form a track. At this time, the drive circuit 5 switches the drive conditions of the optical head 4 such that the information recording surface is divided into radial areas to form a sector structure. Further, by changing the timing of this switching stepwise from the inner circumference side to the outer circumference side in a stepwise manner, the information recording surface is concentrically divided to form 14 zones Z0 to Zn.

Thus, the drive circuit 5 forms nine sectors on one track in the innermost zone Z0,
As it is sequentially displaced to the outer peripheral zone Z1,.
The number of sectors on the track is increased by one.

Each sector starts with an address area AR, as indicated by arrows A and B, showing the boundaries of the sector in an enlarged manner.
2 and the remaining area AR1 is allocated to the user area. The drive circuit 5 controls the user area AR1 under the control of a system control circuit (not shown).
In, the laser beam irradiation position is displaced by the drive signal SD, whereby the user area AR1 is formed to meander a groove.

In the address area AR2, the displacement of the laser beam irradiation position is stopped in the first half of the address area AR2, and the light amount of the laser beam is intermittently raised by the drive signal SD, whereby the track center by the groove is formed. A pit row is formed on the top. Also, in the latter half of the address area AR2, the laser beam irradiation position is displaced onto the track center by the land on the inner peripheral side, and the light amount of the laser beam is intermittently started by the drive signal SD. A pit row is formed.

Thus, the drive circuit 5 records the address data of the succeeding sector by the pits on the corresponding track center in the first half of the address area AR2 in the form of a pit string, and the second half of the address area AR2. The address data of the sector by the land on the peripheral side is recorded on a corresponding track center by a pit row.

At this time, when the optical disk is prepared from the master disk 2, the drive circuit 5 has a wavelength of 650 [nm].
The light amount at the time of laser beam irradiation is set such that the depth of the pits and grooves becomes 1/6 to 1/5 wavelength with respect to the laser beam. The grooves are formed so that the amplitude is 15 to 30 [nm].

The wobble signal generating circuit 7 outputs a sine wave signal of a predetermined frequency synchronized with the rotation of the master disc 2 as a wobble signal WB. At this time, the wobble signal generation circuit 7 sequentially increases the frequency of the wobble signal WB and outputs it in accordance with the zoning described above with reference to FIG. Thereby, the wobble signal generation circuit 7
The laser beam irradiation position is displaced by the wobble signal WB to meander the groove for 397 periods per sector.

Thus, in the address area (header area) AR2, a length corresponding to five periods of the groove is allocated, and in the track of the innermost zone Z0, the groove is formed to meander for 3573 periods.
The groove is formed so that the meandering of the groove is sequentially increased by 397 cycles per track as the zone moves to the outer peripheral zone. In this embodiment, one of the groove meanders is used.
25 bytes of data are stored in user area A
R1 is assigned to R1, and one cycle is formed by a length of about 42 [μm].

The address signal generation circuit 6 generates and outputs an address signal SA whose value sequentially changes according to the displacement of the optical head 4 under the control of the system control circuit. That is, the address signal generation circuit 6 receives a timing signal (comprising an FG signal or the like) synchronized with the rotation of the master disk 2 from the spindle motor 3 or the like, and counts this timing signal by a predetermined counter. Thereby, the address signal generation circuit 6 generates the address data ID of the laser beam irradiation position as shown in FIG. 4 (FIGS. 4A and 4C).
1) and (C2)). The numbers shown in FIG. 4 are the number of bytes of each data.

The address signal generation circuit 6 adds a sector mark SM, synchronization timing data VFO, an address mark AM, and a postamble PA to the address data ID, and the first half and the second half of the address area AR2, respectively. Is generated (FIGS. 4 (B), (C1) and (C2)). Here, the address signal generation circuit 6 forms each sector header by 62 bytes, and forms data to be recorded in the address area AR2 by 8 Kbytes. The sector mark SM is
Set to indicate the start of the sector header, 4 bytes are allocated. The timing data VFO for synchronization is
It is arranged to lock the PLL circuit in the optical disk device, and 26 bytes and 16 bytes are allocated from the head side, respectively.

The address mark AM is a synchronizing signal of the address, and one byte is allocated. The address data ID is 6 bytes, of which 2 bytes are an error detection code. The address data ID is such that the same data is repeatedly recorded twice, thereby improving the reliability. The postamble PA is arranged to set the polarity of the signal, and is assigned one byte.

The address signal generating circuit 6 converts the sector header thus generated into a serial data string, and modulates this serial data string in a predetermined format. Further, the address signal generation circuit 6 outputs the modulated signal as an address signal SA. At this time, the address signal generation circuit 6 outputs the address signal SA at a timing corresponding to the scanning of the laser beam L.

The synthesizing circuit 8 outputs the wobble signal WB
And the address signal SA to generate a drive signal SD including a displacement signal for displacing the optical system of the optical head 4 and a light amount control signal for controlling the light amount of the laser beam. Output to the drive circuit 5.

As a result, the optical disk produced from the master disk 2 is preformatted so that the information recording surface is divided concentrically and the number of sectors increases sequentially from the inner peripheral zone toward the outer peripheral zone. It is formed.
Further, at the head of each sector, an address area AR2 is formed. The address of the sector by the following groove and the address of the sector by the following land are recorded in this address area AR2, and desired data is recorded in the following user area AR1. Will be.

For this user area AR1 (FIG. 4)
(B)) In this embodiment, with a gap of 0.5 byte and 8 bytes, a guard of 24 bytes, 25 bytes,
Byte VFO, 2 bytes of synchronization byte, 9672 bytes of user data, 1 byte of postamble (P
A), a guard of 52 bytes, and a buffer of 16 bytes are sequentially allocated.

Here, the gap is a land-groove switching area and a laser beam intensity switching area, and the guard suppresses the fluidity of the recording material due to overwriting when a phase change medium is used as the recording medium. It is arranged to improve the overwrite cycle of the recording area. The synchronization byte is placed for locking the PLL circuit in the optical disc device, the postamble is placed for polarity setting, and the buffer is
This is a redundant area of a recording area for absorbing jitter due to eccentricity or the like.

FIG. 5 is a perspective view showing an optical disk produced from the master disk 2, and a cross-sectional view showing a cross section of a groove portion. This optical disc is formed entirely with a thickness of 1.2 mm. In the case of a phase-change optical disc, an aluminum film, a ZnS—SiO ₂ film, a GeSbTe film, a ZnS—S film are formed on a disc substrate.
An iO ₂ film is sequentially formed to form an information recording surface. In a magneto-optical disk, an aluminum film, a SiN film, a TbFeCo film, and a SiN film are sequentially formed on a disk substrate to form an information recording surface. In the case of a write-once type, aluminum or gold sputtering is performed on the disk substrate. An information recording surface is created by sequentially forming a film and a predetermined organic dye film.

Further, on this information recording surface, a light transmitting surface for transmitting the laser beam and guiding the laser beam to the information recording surface is formed with a thickness of about 0.1 [mm]. Thus, even if the optical disk according to this embodiment is irradiated with a laser beam from a high numerical aperture optical system via a light transmitting surface, the effect of skew is effectively avoided and desired data is stored on this information recording surface. Recording and reproduction can be performed reliably.

This optical disk has a diameter of 120 [m
m] and a radius of 24 [mm] to 58 [mm]
Area is allocated to the recording area.

Further, the optical disk is stored and stored in a predetermined cartridge formed so as to be able to identify the type of the optical disk, and is formed so as to be able to be loaded together with the cartridge into the optical disk device. In this case, the influence of dust and the like can be effectively avoided even when the access is made.

Thus, the optical disk is formed so that the crystal structure of the information recording surface is locally changed by laser beam irradiation to record desired data in the phase change type optical disk. It is formed so that data recorded by detecting a change can be reproduced.

In a magneto-optical disk, a magnetic field is applied to a laser beam irradiation position so that desired data can be thermomagnetically recorded, and the polarization plane of return light is detected to utilize the magnetic Kerr effect. It is formed so that the recorded data can be reproduced. In the case of a write-once type,
The information recording surface is locally destroyed by laser beam irradiation so that desired data can be recorded, and the recorded data can be reproduced by detecting a change in the amount of return light.

In these cases, in the optical disk, in each zone, the disk master 2 is driven to rotate under the condition of a constant angular velocity, and the frequency of the wobble signal is switched step by step, and a groove is formed by the wobble signal WB. Will be. As a result, the optical disk is zoned so that the meandering period of the groove converted into the rotation angle of the optical disk is formed in each zone.

FIG. 6 is a block diagram mainly showing a wobble signal processing system in an optical disk apparatus for accessing the optical disk manufactured as described above. In the optical disk device 10, the optical head 11 irradiates the optical disk 12 with a laser beam and receives the return light.

That is, as shown in FIG.
, The semiconductor laser 13 generates a predetermined driving signal SL
And emits a laser beam having a wavelength of 650 [nm]. At this time, the semiconductor laser 13 emits a laser beam with a constant light amount during reproduction. On the other hand, at the time of recording, a laser beam is emitted by intermittently increasing the amount of light, and in this embodiment, pits or marks are formed on the information recording device of the optical disk 12 by the rise of the amount of laser beam. It can be formed.

The subsequent collimator lens 14 converts the laser beam emitted from the semiconductor laser 13 into a parallel beam, and the subsequent shaping lens 15 corrects the astigmatism of the laser beam, transmits the laser beam through the beam splitter 16, and outputs the objective beam. The light exits to the lens 17.

The objective lens 17 focuses the laser beam on the information recording surface of the optical disk 12 and receives the return light. Thus, in the optical disk device 10, when the optical disk 12 is a read-only optical disk, data recorded on the optical disk 12 can be reproduced according to a change in the amount of the return light. When the optical disk 12 is a phase-change type optical disk, desired data can be recorded by locally changing the crystal structure at the laser beam irradiation position, and the recorded data can be reproduced according to the change in the amount of return light. It has been done.

Further, when the optical disc 12 is a write-once optical disc, the laser beam irradiation position is locally destroyed to record desired data, and the recorded data can be reproduced according to the change in the amount of return light. ing. On the other hand, when the optical disk 12 is a magneto-optical disk, the modulation coil 18 arranged close to the objective lens 17 is driven by a predetermined drive circuit 19 to apply a predetermined modulation magnetic field to the laser beam irradiation position. Desired data is recorded by applying the thermomagnetic recording technique, and the recorded data can be reproduced by detecting a change in the polarization plane of the return light.

Thus, the beam splitter 16 transmits the laser beam incident from the shaping lens 15 and emits it to the objective lens 17, while reflecting the return light incident from the objective lens 17 to separate the optical path, and The light is emitted to the splitter 20.

The beam splitter 20 transmits and reflects this return light, and separates the return light into two light beams and emits them.

The lens 21 receives the return light reflected by the beam splitter 20, and converts the return light into a convergent light beam. The cylindrical lens 22 gives astigmatism to the return light emitted from the lens 21. The light detector 23 is
The return light emitted from the cylindrical lens 22 is received.

Here, the photodetector 23 divides the light receiving surface into a predetermined shape and can output the light receiving result of each divided light receiving surface. Thus, the photodetector 23 performs a current-to-voltage conversion of the light-receiving result of each light-receiving surface by a current-to-voltage conversion circuit (not shown), and then performs addition and subtraction processing by a matrix circuit, so that the signal level changes according to the amount of return light. A signal RF, a push-pull signal PP whose signal level changes according to the displacement of the laser beam irradiation position with respect to the groove or the pit row, and a focus error signal FE whose signal level changes according to the defocus amount are detected. .

On the other hand, the half-wave plate 25 receives the return light transmitted through the beam splitter 20 and changes the polarization plane of the return light to separate the return light in the polarization beam splitter 27 described later. Light is emitted by a suitable polarization plane. The lens 26 converts return light emitted from the half-wave plate 25 into a convergent light beam. Polarizing beam splitter 27
Receives the return light, reflects a predetermined polarization component and transmits the remainder, and thereby separates the return light into two light beams whose light amount changes complementarily according to the polarization plane.

The photodetectors 28 and 29 respectively receive the two beams separated by the polarization beam splitter 27, and output a light reception result whose signal level changes according to the amount of received light. The differential amplifier 30 receives the light reception results of the two photodetectors 28 and 29 via the current-voltage conversion circuit and obtains the differential amplification results, so that the signal level is changed according to the polarization plane of the return light. The changing reproduction signal MO is output.

Thus, the optical head 11 can record desired data on various optical disks 12 and reproduce the recorded data.

FIG. 8 shows the objective lens 1 of the optical head 11.
FIG. 7 is a cross-sectional view illustrating a peripheral configuration of a seventh embodiment. This objective lens 17
Is composed of a first lens 17A and a second lens 17B. Here, the first lens 17A and the second lens 1
7B is formed of an aspherical plastic lens,
It is integrally held by a predetermined holding member 17C, and is movable up, down, left, and right on the drawing by a drive actuator 17D. Thus, in the optical disc device 10, the first lens 17A and the second lens 17B can be integrally moved to perform tracking control and focus control.

In the first lens 17A and the second lens 17B, the second lens 17B on the laser beam incident side is formed to have a relatively large diameter, whereas the first lens 17A on the optical disk 12 is small. Formed by caliber,
The focal lengths and intervals are set so that the numerical aperture of the objective lens 17 as a whole is 0.78.

Thus, the objective lens 17 can satisfy the following relational expression. Where λ is
The wavelength of the laser beam, NA is the numerical aperture of the objective lens 17, t is the thickness of the light transmitting layer of the optical disk 12, and Δt is the variation of t. Θ is a skew margin of the optical disc 12.

[0057]

(Equation 2)

[0058]

(Equation 3)

The equation (2) shows the relationship between the skew margin θ for stably accessing the optical disk and the optical system (Japanese Patent Laid-Open No. 3-225650). Has a skew margin θ of about 0.6 degrees on the market. In a DVD, the skew margin θ is set to 0.4 degrees. Thereby, in this embodiment, the thickness of the light transmission layer of the optical disc 12 is set to 0.1 [m
m] and the numerical aperture NA of the optical system is set to a large value, so that the optical disk 12 can be accessed sufficiently stably for practical use.

The equation (3) shows the variation of the thickness t of the light transmitting layer which can be tolerated in the optical system.
Is a value calculated on the basis of a compact disc, Δt is ± 100 [μm] for a compact disc,
For DVD, it is ± 30 [μm]. Thereby, in the optical disk device 10, even if the thickness t of the light transmitting layer varies, the optical disk 12 can be accessed stably.

Thus, the optical head 11 irradiates the optical disk 12 with a laser beam having a wavelength of 650 [nm] through an optical system having a numerical aperture of 0.78 so that the following relational expression is satisfied. It has been done.

[0062]

(Equation 4)

Here, the numeral 4.7 is the recording capacity [GB] of the DVD, and the numerals 0.65 and 0.6 are the wavelength of the laser beam and the numerical aperture of the optical system in the DVD, respectively. Thereby, in the optical head 11,
Approximately 8 data processed using the same format as DVD
The recording capacity of [GB] can be ensured.

In the objective lens 17 thus formed, the first lens 17A is held so as to protrude toward the optical disk 12, and is thereby held at the working distance WD required by the numerical aperture. I have. In this embodiment, the characteristics and arrangement of the first lens 17A and the second lens 17B are selected.
The working distance WD is set to about 560 [μm], whereby the optical head 11
The eccentricity tolerance between the lens surfaces, the surface angle tolerance, and the curvature of the lens can be set within the range that can be mass-produced practically, and the overall shape can be reduced in size. Has been made to be able to effectively avoid.

That is, in the optical head, if a laser beam having the same beam diameter is incident and the numerical aperture is increased,
It is necessary to dispose the objective lens close to the information recording surface of the optical disc. Thus, if an optical head is to be arranged with a sufficient distance from the optical disk, the beam diameter of the laser beam must be significantly increased as compared with the conventional case. On the other hand, the beam diameter of the laser beam is 4.5, which is almost the same as that of DVD.
[Mm] is a practical upper limit.

On the other hand, when the optical head is arranged close to the optical disk, the beam diameter of the laser beam is reduced accordingly, and when the shape of the optical system is reduced, the production accuracy of the objective lens is correspondingly reduced. However, there is a possibility that the arrangement accuracy becomes higher and the optical head collides with the optical disk. Accordingly, in this embodiment, the working distance WD
Is set to about 560 [μm] to satisfy these conditions.

Further, the optical disk 12 of the first lens 17A
The side lens surface is formed flat so that focus control can be reliably performed, and even if the optical disk 12 is skewed, it does not collide with the surface of the light transmitting layer.

Further, the objective lens 17 is
The diameter of the lens on the optical disk 12 side is formed small enough to guide the laser beam to the optical disk 12.

The modulation coil 18 is connected to the first lens 17A.
And the side surface on the optical disk 12 side is substantially flat with the lens surface of the first lens 17A. Thereby, the modulation coil 18 is connected to the first lens 1.
The optical disk 12 does not protrude from the lens surface of the optical disk 7A.
The modulation magnetic field can be efficiently applied to the laser beam irradiation position.

Further, the temperature rise of the modulation coil 18 is reduced by the heat radiating plate 17E disposed on the side of the second lens 17B so as to surround the first lens 17A. It is made to be able to stay in a sufficient range.

In the optical disk device 10 (FIG. 6), the spindle motor 33 drives the optical disk 12 to rotate under the control of the system control circuit 34. At this time, in the normal operation mode, the spindle motor 33
The write / read clock R / generated by the L circuit 35
By rotating the optical disc 12 so that WCK has a constant frequency, as shown in FIG.
The optical disk 12 is driven to rotate by a CLV (Zone Constant Liner Velocity) technique. Here, this ZCL
The zoning by V corresponds to the zoning described with reference to FIG.

That is, the spindle motor 33 sequentially drives the optical disc 1 in accordance with the laser beam irradiation position.
2 is switched (FIG. 9 (A)), thereby improving the recording density of the optical disk device 10 by preventing the linear velocity and the linear recording density from changing significantly between the inner peripheral side and the outer peripheral side (FIG. 9). (B) and (C)).

On the other hand, in the special operation mode such as post-recording, the spindle motor 33 controls the optical disk 12 at a predetermined rotation speed under the control of the system control circuit 34.
Is driven to rotate.

The thread motor 36 can move the optical head 11 in the radial direction of the optical disk 12 under the control of the system control circuit 34, and the optical disk device 10 can seek by this.

The address detection circuit 37 receives from the optical head 11 a reproduction signal RF whose signal level changes in accordance with the amount of return light, and binarizes the reproduction signal RF. 2 more
The address data ID is detected from the coded signal based on the synchronization signal assigned to the sector header and output to the system control circuit 34, and the detected timing is notified to the cluster counter 38. As a result, the optical disk device 10 uses the system control circuit 34 to store the address data ID preformatted on the optical disk 12.
The laser beam irradiation position can be specified on the basis of the data, and the cluster counter 38 can confirm the timing of the sector.

Further, when outputting the address data ID, the address detection circuit 37 performs an error detection process using the error detection code assigned to each address data ID, and selectively selects the address data ID determined to be correct. Output.

The wobble signal detection circuit 39 supplies the push-pull signal PP output from the optical head 11 to the band-pass filter 39A, where the wobble signal WB is extracted. Further, the wobble signal detection circuit 39 binarizes the wobble signal WB with reference to the 0 level in the subsequent comparison circuit (COM) 39B, thereby extracting edge information of the wobble signal WB.

The wobbling cycle detection circuit 40 receives the binarized binarized signal S1 and receives the binarized signal S1.
By determining the timing of the corresponding edge with reference to the timing of each edge of No. 1, it is determined whether or not the wobble signal WB changes at the correct cycle. Further, the wobbling cycle detection circuit 40 selectively outputs edge information determined as a correct cycle to the PLL circuit 35. Thus, the wobbling cycle detection circuit 40 prevents the clock CK from being displaced by dust or the like attached to the optical disc 12.

The PLL circuit 35 supplies the binary signal output from the wobbling cycle detection circuit 40 to the phase comparison circuit (PC) 35A, where it compares the phase with the clock CK output from the frequency divider 35B. Here, the frequency divider 35B
In, the frequency division ratio is switched according to the setting of the system control circuit to output a predetermined clock CK.

As a result, in the PLL circuit 35, a low-frequency component of the phase comparison result output from the phase comparison circuit 35A is extracted by the low-pass filter (LPF) 35C, and the voltage-controlled oscillation circuit ( VCO) 36D is controlled. Further, the oscillation output of the voltage control type oscillation circuit 36D is frequency-divided by the frequency divider 35B, so that a highly accurate clock CK can be generated.

In the PLL circuit 35, the frequency divider 35
B is set by the system control circuit 34 so as to correspond to the zoning explained with reference to FIG. Thus, the PLL circuit 35 increases the frequency of the oscillation output of the voltage-controlled oscillation circuit 36D with respect to the frequency of the wobble signal WB in a stepwise manner as the laser beam irradiation position is displaced toward the outer peripheral side of the optical disc 12. The oscillation output is written to the write / read clock R / W CK
Output as

In the optical disk device 10, in a normal operation mode, the optical disk 12 is rotated by the spindle motor 33 so that the write / read clock R / WCK has a constant frequency, and the write / read clock R / W By recording desired data on the basis of WCK, the linear recording density is not largely changed between the inner peripheral side and the outer peripheral side, and the recording density can be increased accordingly.

The cluster counter 38 counts the write / read clock R / W CK based on the detection result of the address detection circuit 37, thereby providing high accuracy based on the write / read clock R / W CK. Specify the laser beam irradiation position. Further, the cluster counter 38 calculates, based on the count result,
A cluster start pulse is output to the system control circuit 34. Here, the cluster is a unit for recording and reproducing data on and from the optical disk 12, and the cluster start pulse is a pulse for instructing the start timing of the cluster.

In this process, the cluster counter 38
In the case where the sector detection timing is not detected by the address detection circuit 37 due to, for example, dust on the disk surface, the cluster start pulse is interpolated by the synchronization process based on the count result of the write / read clock R / WCK. .

The system control circuit 34 is composed of a computer for controlling the operation of the entire optical disk device 10 and, based on the sequentially input address data ID,
By controlling the operation of the thread motor 36 and the like and switching the overall operation mode, the overall operation is controlled in accordance with the laser beam irradiation position and further by control from an external device.

In this series of processing, the system control circuit 34 switches the frequency division ratio of the frequency divider 35B according to the frequency division ratio data stored in the memory 42 in accordance with the laser beam irradiation position based on the address data ID. .

Thus, in the normal operation mode, the system control circuit 34 operates in the zone Z described above with reference to FIG.
0, Z1,..., Zn-1, and Zn, the rotation speed of the optical disk is gradually reduced stepwise from the inner peripheral side toward the outer peripheral zone so as to correspond to the inner peripheral zone and the outer peripheral zone. Each sector is set to the same recording density with the zone on the side.

On the other hand, in the special operation mode such as post-recording, the two-channel user data DU1 and DU
In the case where the recording / reproducing process is alternately repeated for No. 2 or when the user data DU1 and DU2 of two channels are alternately reproduced from the optical disc 12 and output simultaneously and in parallel, the system control circuit 34 The operation of the spindle servo circuit is controlled so that the rotation speed of the optical disk 12 is not switched even if the zone is switched for reproduction.

When the recording / reproducing process is alternately repeated, the system control circuit 34 performs
Even if the zone is switched, the user data DU is reproduced at the rotation speed of the optical disk 12 at the time of the immediately preceding recording. Also, user data DU1 and DU2 of two channels
Are alternately reproduced from the optical disk 12 and output simultaneously and in parallel, with respect to one user data, the optical disk 1 is determined by the rotation speed at the time of reproducing the other user data.
2 is played back from the optical disk 12 while being rotated.
In these cases, the system control circuit 34 determines that the recording side channel and the other reproduction side channel have Z
By applying the CLV method, the optical disc 12 is driven to rotate at a rotation speed twice as high as the rotation speed set for each corresponding zone to record and reproduce user data.

In this type of optical disk device, when the rotation speed of the optical disk is switched,
It takes time to settle. As a result, in the optical disk device 10, the time required for switching to the rotation speed of the optical disk 12 is omitted, and recording / reproducing is performed only by the waiting time required for locking the PLL circuit, which is much shorter than the switching of the rotation speed. Operation is switched.

At this time, the system control circuit 34 sets the rotation speed of the optical disk 12 to about twice the rotation speed in the normal operation mode in the control of ZCLV applied to the recording side channel and the other reproduction side channel. . As a result, the system control circuit 34 intermittently records and reproduces the user data DU on the optical disc 12 at a high speed and intermittently when processing the two-channel user data, thereby performing seek and other processing. You have enough time to make sure.

FIG. 10 is a flowchart showing a process of setting the rotation speed of the optical disk in the system control circuit 34. When the user selects the operation mode, the system control circuit 34 proceeds from step SP1 to step SP1.
The process proceeds to step 2, where it is determined whether or not the operation mode selected by the user is the above-described operation mode such as after-recording. If a negative result is obtained here, the process proceeds to step SP3. Here, the system control circuit 34 sets the operation mode of the spindle servo circuit to the operation mode based on ZCLV, and then proceeds to step SP4 and ends this processing procedure.

On the other hand, if the operation mode selected by the user is the above-described operation mode such as after-recording, a positive result is obtained in step SP2, and the system control circuit 34 proceeds to step SP5. Here, for example, when recording and reproducing two channels, respectively, the system control circuit 34 performs
When reproducing two channels, the switching of the rotation speed is stopped for any one of the channels (that is, the operation mode is set to CAV). Subsequently, the system control circuit 34 proceeds to step SP6, and for the remaining channels, the ZCL at the above-described rotation speed.
After the operation mode based on V is set to the spindle control, the process proceeds to step SP4, and this processing procedure ends.

The system control circuit 34 executes write / read control in accordance with the cluster start pulse output from the cluster counter 38 while controlling the rotation speed of the optical disk 12 in this manner, so that the address set in each sector is controlled. One cluster of data is assigned to four consecutive sectors based on the area AR2. Thus, the system control circuit 34 sequentially increases the number of clusters assigned to each zone from the inner zone to the outer zone.

Further, the system control circuit 34 instructs a tracking servo circuit (not shown) to switch the moving direction of the objective lens 17 with respect to the polarity of the tracking error signal, thereby scanning the laser beam with the groove and the land between the grooves. Switching control is performed between and.
Thus, the optical disk device 10 can perform so-called land / groove recording.

FIG. 1 is a block diagram showing a recording / reproducing system of the optical disk device 10. This optical disk device 10
In, the disc discriminator 50 identifies the type of the optical disc 12 from, for example, a recess formed in the cartridge,
The identification signal is output to the system control circuit 34. Thus, the optical disk device 10 can switch the operation of the recording / reproducing system according to the type of the loaded optical disk 12, and can access various optical disks.

Here, the encoder 51 inputs an input signal SIN composed of a video signal and an audio signal from an external device at the time of recording, editing, and the like, and after performing an analog-to-digital conversion process on the video signal and the audio signal,
Data is compressed according to a format prescribed by MPEG (Moving Picture Experts Group). Further encoder 5
1 packetizes the data-compressed video signal and audio signal, and adds a packet header, control data, and the like to each packet. The encoder 51 sequentially multiplexes the data-compressed video signal and the audio signal by sequentially outputting these packets,
The user data DU is generated by the time-division multiplexed bit stream.

In this series of processing, the encoder 51
Can simultaneously and simultaneously process two-channel video and audio signals and output two-channel user data DU1 and DU2 corresponding to the two-channel video and audio signals simultaneously and in parallel. Under the control of the system control circuit 34, these two channels are simultaneously processed in parallel if necessary.

On the other hand, the decoder 52 expands the user data DU output from the recording / reproducing circuit 53 at the time of reproduction and editing, according to a format prescribed in MPEG, and reproduces the digital video signal at the time of reproduction and editing. , A digital audio signal, and converts the digital video signal and the digital audio signal into an analog signal SOUT and outputs it.

The decoder 52, like the encoder 51, is configured so as to be able to execute such decoding processing simultaneously and in parallel on up to two channels of video and audio signals SOUT1 and SOUT2.
The operation is switched under the control of the system control circuit 34 to execute the two-channel simultaneous parallel processing as necessary.

The recording / reproducing circuit 53 stores the user data DU output from the encoder 51 in the memory 54 at the time of recording and editing, and processes the user data DU in a predetermined block unit to record it on the optical disk 12.

That is, as shown in FIG. 11, the recording / reproducing circuit 53 sequentially divides the user data DU into 2048-byte units, and adds 16-byte address data and an error detection code to each block. The recording / reproducing circuit 53 forms a sector data block using the 2048 bytes + 16 bytes. The address data is the address data of this sector data block. Note that the sector based on the user data DU is different from the sector based on the preformat described above with reference to FIG. The error detection code is an error detection code of the address data.

Further, as shown in FIG. 12, the recording / reproducing circuit 53 forms an ECC data block (182 bytes × 208 bytes) by 16 sector data blocks. In other words, the recording / reproducing circuit 53
16 sector data blocks of byte + 16 bytes are sequentially arranged in raster scanning order in units of 172 bytes,
In this lateral direction, an error correction code (PI) consisting of an inner code is generated. Further, an error correction code (PO) consisting of an outer code is generated in the vertical direction.

The recording / reproducing circuit 53 interleaves the ECC blocks to form a frame structure shown in FIG. That is, the recording / reproducing circuit 53 allocates a 2-byte frame synchronization signal (FS) to each of the 91 bytes of the ECC data block of 182 bytes × 208 bytes.
6 frames are formed. Thereby, the recording / reproducing circuit 53
Forms data of one cluster by the frame structure shown in FIG. 13, and allocates this one cluster to four consecutive sectors.

At this time, the recording / reproducing circuit 53 assigns predetermined fixed value data as necessary, and processes continuous data by the sector structure described above with reference to FIG.
Further, the recording / reproducing circuit 53 modulates (1, 7) RLL-modulates the data string having such an arrangement, and then performs an arithmetic processing between successive bit strings and outputs the result. Further, at the time of this output, by operating based on the write / read clock R / WCK, in a normal operation mode, the data is output at a data transfer rate of 11.08 [Mbps] in terms of user data DU. As a result, the data is output intermittently at a higher transfer rate than the user data DU input from the encoder 51. Thereby, the recording / reproducing circuit 5
Reference numeral 3 shows that the optical head 11 can be sought by using the remaining free time for recording the user data DU intermittently, and by this seek, continuous user data can be discretely recorded.

Further, in a special operation mode such as post-recording, the user data DU is converted to about 20 [Mbp].
s], and outputs data modulated by the data transfer rate.
This allows the user data DU1 and DU2 of two channels to be recorded alternately as needed. In this way, by repeating the recording and reproducing operation in units of clusters, the optical disk device 10 reproduces data recorded on the optical disk 12, edits and records the reproduced data, and further performs post-recording and the like. Processing can be performed.

At the time of this data recording, the recording / reproducing circuit 53
Is the write / read clock R described above with reference to FIG.
The output of data modulated on the basis of / W CK is started, and under the control of the system control circuit 34, the output of data modulated on the basis of the timing detected by the cluster counter 38 is started.

Further, at the time of reproduction, the recording / reproducing circuit 53 amplifies the reproduction signals RF and MO input from the optical head 11 and then binarizes to generate a binarized signal. Further, a clock is reproduced from the reproduction signals RF and MO based on the binarized signal. Thus, the reproduced clock corresponds to the write / read clock R / WCK. Further, the reproduced data is detected by sequentially latching the binarized signal based on the reproduced clock.

At this time, the recording / reproducing circuit 53
(Patial-Response Maximum-Likelihood) is applied to decode the reproduced data to generate decoded data. Further, the recording / reproducing circuit 53 performs a deinterleave process on the decoded data, performs an error correction process, and
Output to 2.

Thus, in DVD, (1, 1,
7) The RLL-modulated data is converted to a minimum pit length of 0.4 [μ
m], and if a recording / reproducing system is formed with the same margin as that of a DVD simply by conversion based on the numerical aperture, the shortest pit length is 0.3 [μm] and the linear recording density is 0.23 [μm / Bit], desired data can be recorded and reproduced. On the other hand, if PRML actively uses intersymbol interference, the line recording density of 0.2
A similar margin can be ensured with 3 [μm / bit] or less.

At this time, in the normal operation mode, the recording / reproducing circuit 53 outputs the user data DU in the same manner as during recording.
The data is intermittently reproduced from the optical disk 12 in clusters at a data transfer rate of 11.08 [Mbps], and the reproduced user data DU is continuously output to the decoder 52 via the memory 54. . On the other hand, in a special operation mode such as post-recording, the user data DU corresponding to the rotation speed of the optical disc 12 is recorded.
The data is intermittently reproduced from the optical disk 12 in units of clusters at a data transfer rate of about 20 [Mbps], and the reproduced user data DU is stored in the memory 5.
4 to the decoder 52 continuously.

In this series of processing during reproduction,
When the optical disk 12 is a magneto-optical disk, the recording / reproducing circuit 53 selectively processes the reproduced signal MO whose signal level changes according to the polarization plane under the control of the system control circuit 34 to reproduce the user data DU. . If the optical disc 12 is a read-only optical disc, a write-once type, or a phase change type, the user data DU is reproduced by selectively processing a reproduction signal RF whose signal level changes according to a change in the amount of return light. Further, even when the optical disk 12 is a magneto-optical disk, when reproducing the lead-in area on the inner peripheral side, the reproduction signal RF is selectively processed to reproduce the user data DU.

The address reading circuit 55 generates address data to be added to each sector data block (FIG. 11) at the time of recording and outputs the address data to the recording / reproducing circuit 53. At the time of reproducing, the address data detected by the recording / reproducing circuit 53 is read. Is analyzed and notified to the system control circuit 34.

The memory 54 is composed of a large-capacity buffer memory for temporarily storing and holding user data.
A write pointer in a memory control circuit (not shown),
By the address control by the read pointer, the recording area is sequentially and cyclically switched, and the user data DU is continuously input / output between the encoder 51 and the decoder 52.
The user data DU is intermittently input / output to / from the optical disk 12 via the recording / reproducing circuit 53 in cluster units.

At this time, the memory 54 stores the two-channel user data D in the special operation mode such as post-recording.
When processing U1 and DU2 simultaneously and in parallel, as shown in FIG.
1 and DU2, input / output pointers P1H and P2H for the optical disk 12 and input / output pointers P1O and P2O for the encoder 51 and the decoder 52 are set, and the encoder 51 and the decoder 52 are controlled by address control using these pointers. , These two channels of user data DU1 and DU2 are input and output simultaneously in parallel and continuously, and with respect to the optical disk 12, the user data DU1 and DU2 are input and output alternately in cluster units. I do.

FIG. 14 shows the setting of pointers in the case of after-recording described later. The input / output pointers P1H and P2H for the optical disk 12 indicate the read and write pointers RPw and WPr for the optical disk 12, respectively. 51, decoder 52
, Pointers WPw for input from the encoder 51 and a pointer RPr for output to the decoder 52, respectively.

As described above, if the capacity of the memory 54 is set to about 10 [Mbit], the data transfer rate to the encoder 51 and the decoder 52 becomes 8 [Mbps],
Assuming that the time required for the seek is about 200 [msec], the user data of two channels is alternately recorded and reproduced on the optical disc 12 at intervals of about 2 seconds without interrupting the video signal and the audio signal by the user data. It can be recorded and reproduced.

At the time of writing, when the optical disk 12 is a magneto-optical disk, the laser drive circuit 57 controls the write / read clock R / W under the control of the system control circuit 34.
The semiconductor laser of the optical head 11 is driven at a timing synchronized with CK, whereby the light amount of the laser beam is intermittently started.

The laser drive circuit 57 intermittently sets the light amount of the laser beam by the output data of the recording / reproducing circuit 53 under the control of the system control circuit 34 when the optical disk 12 is of the phase change type or the write-once type during writing. And the user data DU is recorded on the optical disk 12. As a result, in the optical disc device 10, a mark row or pit row having a maximum run length of 8T and a minimum run length of 2T is formed by the shortest recording mark or the shortest recording pit of 4/3 bits, and the linear recording density is 0.21 [μm / bi.
t] to record user data.

On the other hand, at the time of reading, the laser drive circuit 57 holds the light amount of the laser beam at a constant low level.

The modulation coil driving circuit 56
When 2 is a magneto-optical disk, the recording operation is started under the control of the system control circuit 34, and the modulation coil of the optical head 11 is driven by the output data of the recording / reproducing circuit 53.
As a result, the modulation coil drive circuit 56 applies a modulation magnetic field to the laser beam irradiation position where the light amount rises intermittently, and applies the thermomagnetic recording method to obtain the shortest recording mark 4 /.
A mark having a maximum run length of 8T and a minimum run length of 2T is formed by 3 bits, and a linear recording density of 0.21 [μm /
bit] to record user data.

FIG. 15 is a chart showing control of the system control circuit 34 during normal recording and reproduction. In the following description, writing and reading to and from the optical disk 12 are indicated by reference numerals R and W in the drawings. During recording, the system control circuit 34 sequentially inputs 1
The video signal and the audio signal SIN (FIG. 15A) of the channel are converted into user data DU by the encoder 51 and sequentially input to the memory 54. Further, while the optical head 11 seeks to a target sector and keeps it still, the data amount of a predetermined recording unit is accumulated in the memory 54, and when the free space of the memory 54 becomes equal to or less than a predetermined value, the cluster is set as a unit. The user data DU stored in the memory 54 is recorded on the optical disc 12 (see FIG. 1).
5 (B) and (C1)).

When the amount of user data held in the memory 54 becomes equal to or less than a predetermined value by the recording process on the optical disc 12, the system control circuit 34
Suspend the recording for 2. The system control circuit 34
The optical head 11 is kept in a still state with respect to the succeeding sector, and waits until the data amount of the recording unit is accumulated in the memory 54 again. When the data amount of the recording unit is accumulated in the memory 54, The information is recorded on the optical disk 12 again (FIG. 15).
(B) and (C2)).

Thus, the system control circuit 34 intermittently compresses the user data DU via the memory 54 on the time axis and records continuous user data DU in continuous sectors. The system control circuit 34
Is determined based on the file management data recorded in the lead-in area of the optical disc 12, and if a continuous area cannot be secured on the optical disc 12, the user data DU is recorded discretely. D
When U is recorded on the optical disk 12, not only the still but also the seek process is executed, and the rotation speed of the optical disk 12 is switched as needed.

On the other hand, if the user selects the reproduction process, the system control circuit 34 instructs the start of reproduction after the optical head 11 seeks to the target sector. The stored user data DU is stored in the memory 54, and the user data DU stored in the memory 54 is sequentially output to the decoder 52. In this state, when the data amount of the user data DU stored in the memory 54 becomes a predetermined recording and reproducing unit and the free space of the memory 54 becomes equal to or less than a predetermined value, the system control circuit 34
The optical head 11 is held still with respect to the subsequent sector, and the reproduction of the user data DU from the optical disk 12 is interrupted.

When the amount of data held in the memory 54 drops below a predetermined value in this state, the system control circuit 34
An instruction to start reproduction of the optical disk 12 is issued. As a result, the system control circuit 34 intermittently reproduces the user data DU from the optical disc 12 and outputs continuous video and audio signals SOUT without interruption.

FIG. 16 is a schematic diagram showing a case where the user selects the chase playback mode. This chasing playback is set, for example, when recording the video signal and the audio signal specified by the user and the user instructs the playback of the program being recorded from the recording start position while maintaining the recording mode. .

When the operation mode is selected by the user while the video signal and the audio signal of one channel are recorded on the optical disk 12 as described with reference to FIG.
2 is switched to twice the normal rotation speed. In synchronization with this, the write / read clock R / WC
The frequency division ratio of the frequency divider 35B is set so that K is usually twice the frequency (FIG. 6). Thereby, the system control circuit 3
4 increases the data transfer speed to the optical disk 12 almost twice as much as before, and records the user data DU intermittently on the optical disk 12.

In addition to switching the data transfer speed in this way, the system control circuit 34 uses the idle time during the recording of the user data DU by setting the four pointers described above with reference to FIG. The reproduced user data is reproduced (FIG. 16A)
(B) and (C)). That is, the system control circuit 34
When the user data DU stored in the memory 54 is recorded on the optical disk 12 and the amount of user data for recording stored in the memory 54 falls below a predetermined value, the optical disk 1
2 is interrupted, and the optical head 11 is moved to the recording start position.
Is sought (FIG. 16 (D1)).

Subsequently, the system control circuit 34 starts reproducing the user data DU from this recording start position (FIG. 1).
6 (D2)), the user data DU reproduced from the optical disk 12 are sequentially stored in the memory 54, and the user data DU stored in the memory 54 is output to the decoder 52. At this time, a predetermined amount of user data DU is stored in the memory 54, and when the amount of recording-side user data held in the memory 54 becomes equal to or less than a predetermined value, the decoder 52
The reproduction from the optical disk 12 is interrupted while the output of the user data DU to the.

Further, the system control circuit 34 makes the optical head 11 seek (FIG. 16D3),
While the user data DU is being reproduced, the memory 54
The user data DU stored in the sector is recorded subsequently to the interrupted sector (FIG. 16 (D4)).

When the amount of user data on the recording side stored in the memory 54 exceeds a predetermined value and the amount of user data reproduced from the optical disk 12 and held in the memory 54 becomes equal to or less than the predetermined value, the system control circuit 34 sets The recording process is interrupted, the optical head 11 is sought again, and the subsequent user data is reproduced.

Thus, while recording the continuous video signal and audio signal on the optical disc 12, the system control circuit 34 reproduces and outputs the video signal and the audio signal recorded on the optical disc 12 without interruption.

In recording and reproducing the user data of two channels in this manner, the system control circuit 34
As shown in FIG. 17, when the zone to be recorded is switched from, for example, Zm to Zm + 1, the rotation speed of the optical disk 12 is maintained at twice the normal rotation speed. The optical disc 12 corresponds to the rotation speed of each zone at a normal rotation speed serving as a reference.
Are switched (FIGS. 17A and 17B).
This allows the system control circuit 34 to write and read clock R
/ WCK is maintained at a constant frequency, and accordingly, the linear velocity at the laser beam irradiation position is also maintained substantially constant (FIGS. 17C and 17D).

On the other hand, at the time of reproduction, switching of the rotation speed of the optical disk 12 is interrupted, and the optical disk 12 is reproduced while maintaining the rotation speed at the time of the immediately preceding recording. In this case, in the recording / reproducing circuit 53, a reproduction clock is obtained by a frequency corresponding to the rotation speed of the optical disk 12, and the reproduction clock is used by the reproduction clock.
The obtained reproduction data is processed. Since the reproduced clock corresponds to the write / read clock R / W CK generated by the PLL circuit 35, in this case, the read / write clock R / W CK is used.
Will change in accordance with the laser beam irradiation position.

As a result, the system control circuit 34 reduces the frequency of switching the rotation speed of the optical disk 12 to improve the access speed.

FIG. 18 is a schematic diagram showing a case where the user selects the multi-channel mode. Here, the multi-channel is a process of simultaneously recording or reproducing two-channel video and audio signals. In this case, the system control circuit 34 sets the rotation speed of the optical disc 12 to twice the normal rotation speed, and records or reproduces two-channel video and audio signals.

When the user selects the multi-channel recording mode, the system control circuit 34 processes the two-channel video and audio signals by the encoder 51 and generates two-channel continuous user data DU1 and DU2. , This user data DU1,
DU2 is sequentially input to the memory 54 (FIGS. 18A and 18B).

Further, the system control circuit 34 seeks the optical head 11 at a predetermined recording start position and stands by by setting the four pointers described above with reference to FIG. 14 (FIGS. 18 (C) and (D1)). When a predetermined amount of any of the user data DU1 or DU2 is stored in the memory 54, recording of the user data DU1 or DU2 on the optical disk 12 is started (see FIG.
2)). As a result, when the data amount of the user data whose recording has started in the memory 54 becomes equal to or less than a predetermined value, the recording on the optical disk 12 is interrupted. Further, the system control circuit 34 makes the optical head 11 seek to the recording start position of another channel and waits (see FIG. 18 (D
3)), and similarly record the user data DU held in the memory 54 for the other channels (FIG. 18 (D
4)).

The system control circuit 34 alternately repeats this series of processing, thereby recording successive two channels of user data on the optical disc 12 alternately while inputting them to the memory 54. At this time, the system control circuit 3
Reference numeral 4 preliminarily grasps the recording times of the two video signals and audio signals in accordance with the user's input and the like, secures a continuous area in each channel in advance, and causes the optical head 11 to seek.

On the other hand, when the user selects the multi-channel reproduction mode, the system control circuit 34 seeks the optical head 11 and controls access to the optical disk 12 as in the case of recording. The user data of two channels is intermittently reproduced from the optical disk 12 and stored in the memory 54, and the user data of two channels stored in the memory 54 is continuously decoded by the decoder 52 and output.

The system control circuit 34 maintains the rotation speed of the optical disc 12 at the rotation speed of the other channel for one of the channels even in this multi-channel reproduction mode. The access speed is improved by reducing the switching frequency.

FIG. 19 is a schematic diagram showing a case where the user has selected a post-recording mode. In this case, in the optical disk device 10, as shown in FIG. 20, the sequentially reproduced video signal and audio signal (FIG. 19A) are monitored by an external monitor and a speaker, and an audio signal or the like input by a microphone or the like. Are mixed with the reproduced video signal and audio signal, and are sequentially input (FIG. 19B).

The system control circuit 34 controls the optical disk 12
The data transfer speed and the rotation speed of the optical disk 12 are set to twice those of the normal mode. In this state, the optical head 11 seeks to the reproduction start position of the program selected by the user (FIGS. 19 (C) and (D1)), and the reproduction of the user data DU is started from this position. Further, the reproduced user data is stored in the memory 54, and the stored user data is output via the decoder 52 (FIG. 19).
(D2)). In this state, when a predetermined amount of user data is stored in the memory 54, the system control circuit 34 suspends the reproduction and seeks the optical head 11 to the position at which the reproduction starts (FIG. 19 (D3)). Here, since the reproduced user data is processed by an external device and sequentially stored in the memory 54, the user data stored in the memory 54 is overwritten, for example, in a corresponding portion of the optical disk 12 (FIG. 19 ( D4)). As a result, when the recording-side user data amount or the reproducing-side user data amount stored in the memory 54 becomes equal to or less than a predetermined value, the user data is reproduced from the position where the reproduction was interrupted, and these controls are repeated.

As a result, the system control circuit 34 intermittently reproduces the user data DU from the optical disc 12,
The user data processed by the external device is intermittently re-recorded at the reproduction position of the user data DU. The system control circuit 34 also maintains the rotation speed of the optical disc 12 at the rotation speed of the recording side channel for the reproduction side channel in the post-recording mode, thereby reducing the frequency of switching the rotation speed of the optical disc 12 to reduce the access speed. To improve.

FIG. 21 is a schematic diagram showing a case where the user selects the pointer reproduction mode. In this case, the system control circuit 34 determines based on the file management data recorded in the lead-in area of the optical disc 12, and
Each program recorded on the optical disk 12 is sequentially searched and reproduced for a predetermined period. Therefore, the system control circuit 34
According to the file management data, the optical head 1
1 is sought to find the beginning (FIG. 21 (B)), and the reproduction of the optical disk 12 is started from the position where the beginning is found (FIG. 2).
1 (A1), (B)). Further, the reproduced user data is output via the memory 54 (FIG. 21C).

When a sufficient amount of user data is stored in the memory 54 after a predetermined time has elapsed, the system control circuit 34 seeks the optical head 11 to find the next program (FIG. 21 (A2)). Then, after waiting for the amount of user data in the memory 54 to be reduced to a predetermined value or less, the optical disk 12 is reproduced from the cue point (FIG. 21A
3)). The system control circuit 34 repeats these processes to sequentially locate and reproduce each program recorded on the optical disc 12.

(1-2) Operation of the First Embodiment In the above configuration, in the mastering apparatus 1 (FIG. 2), the master disc 2 is driven to rotate and spiral from the inner circumference toward the outer circumference. By irradiating the laser beam L, grooves are formed at intervals of about 1.0 [μm], and the grooves are formed to meander according to the wobble signal WB.

At this time, the mastering device 1
A groove formed by exposure to a laser beam L;
So that the spacing between adjacent grooves is almost equal
The spot shape and light amount of the laser beam L are set, whereby the optical disc is formed so that land / groove recording can be performed with reference to the groove. At this time, the data is formed so that data of a capacity of 8 GB or more can be recorded by land / groove recording with a linear recording density of about 0.21 [μm / bit] based on the groove. As a result, the mastering apparatus 1 can record data having a capacity of 8 GB or more on the optical disc created from the master disc 2 by effectively utilizing the information recording surface.

At this time, in the mastering device 1, in the address signal generation circuit 6, the address data ID whose value sequentially changes in accordance with the rotation of the disk master 2 (FIG.
(A)) is formed, and synchronization data and the like are added to the address data ID to form data to be allocated to the address area AR2. Further, after the data is modulated, it is combined with the wobble signal WB in the combining circuit 8 and then output to the drive circuit 5. As a result, in the mastering device 1, the meandering of the groove is interrupted at a predetermined angular interval, and address data is recorded on the master disk 2 by a pit string. Is formed.

Thus, in the optical disk formed by the master disk 2, when accessing each sector based on the address data, even if the address data cannot be reproduced correctly due to dust or the like, the groove meandering is used as a reference. By the interpolation processing, each sector can be correctly accessed. Therefore, in the address data, even when information is recorded at a high density, the redundancy can be set low, and the address recorded on the optical disk can be reliably detected by effectively utilizing the information recording surface. it can.

In forming the sector structure in this manner, in the mastering apparatus 1, the master disk 2 is concentrically zoned by switching the frequency of the wobble signal WB, and is shifted from the inner circumferential zone to the outer circumferential zone. A pit row is formed such that the number of sectors increases sequentially. This allows zone C to correspond to this zoning.
The information recording surface can be used efficiently by accessing the optical disk by applying the LV method, and the access speed can be improved.

Further, at this time, the address area AR2 is divided into the front and rear areas, and the address data of the sector by the following groove and the sector by the following land are respectively assigned, so that the data is recorded at a high density by the land / groove recording. Even in this case, the address data can be reliably reproduced by effectively avoiding crosstalk from the adjacent track.

At this time, the error detection code is assigned to two bits of the address data ID, and the address data can be surely reproduced by repeatedly assigning the same address data ID to one area. .

As a result, in the manufacturing process of the optical disk according to this embodiment, the optical disk is created from the master disk 2 by the mastering device 1 through a predetermined process through the sector structure formed on the master disk 2.

In this optical disk (FIG. 5), a light transmitting layer which transmits a laser beam and guides the laser beam to the information recording surface has a thickness of about 0.1 mm on the information recording surface. Thus, even when a laser beam is irradiated from an optical system having a high numerical aperture through a light transmission layer, the effect of skew can be effectively avoided and desired data can be reliably recorded and reproduced on this information recording surface. It is formed.

In the optical disc 12, in the optical disc apparatus, processing such as spindle control is executed based on the groove meander generated in this way, and at this time, the PLL circuit 35 performs the processing with the accuracy based on the groove meander. A high clock CK is generated, and the timing of the sector is detected by the cluster counter 38 (FIG. 7).

That is, in the optical disk device 10 (FIGS. 6 and 7), the optical disk 12 has a wavelength of 650 [nm] via the objective lens 17 having a numerical aperture of 0.78 and a working distance DW set to 560 [μm]. A laser beam is irradiated, the return light is received by the optical head 11, and a reproduction signal RF whose signal level changes according to the amount of return light and a reproduction signal MO whose signal level changes according to the polarization plane of the return light. , A push-pull signal PP whose signal level changes according to the displacement of the laser beam irradiation position with respect to the groove or the pit row, and a focus error signal FE whose signal level changes according to the defocus amount.

The wobble signal WB is detected by the wobble signal detection circuit 39 from the push-pull signal PP.
Is extracted, and the wobble signal WB is binarized to extract edge information. In the subsequent PLL circuit 35, the binary signal S1 having the edge information is phase-synchronized with the output signal CK of the frequency divider 35B to generate the write / read clock R / W CK.

At this time, since the wobble signal WB is generated by the carrier signal of a single frequency, in the edge information obtained by binarization, each edge information has correct phase information. As a result, a highly accurate write / read clock R / W CK is generated in phase synchronization with the edge information.

Further, the read / write clock R / W
The CK is counted by the cluster counter 38 based on the frame synchronization timing detected from the address area AR2 by the address detection circuit 37, and the write / read timing in the recording / reproduction circuit 53 is set. At this time, by setting this timing with reference to the clock R / W CK having high accuracy, the optical disk device 10 can determine the laser beam irradiation position with high accuracy and set the writing timing and the like. . Therefore, when recording user data on the optical disc 12 at high density, the user data can be recorded using the information recording surface of the optical disc 12 at high density.

At this time, even if it is difficult for the address detection circuit 37 to correctly detect the frame synchronization timing due to the influence of dust or the like, the clock R / W CK output from the PLL circuit 35 is counted by the cluster counter 38. Correct timing can be detected, so that even when desired data is recorded and reproduced at a high density by an optical system having a high numerical aperture, such data can be reliably recorded and reproduced.

When the wobble signal WB is processed in this manner, the PLL circuit 35 switches the frequency division ratio of the frequency divider 35B according to the laser beam irradiation position.
Thus, the optical disc 12 is driven to rotate by the ZCLV.

At this time, the meandering period of the groove is constant in each region in terms of the rotation angle, so that
Synchronization of the PLL circuit 35 is quickly formed in each zone, and the access speed can be improved accordingly.
In addition, since the groove meandering is formed at a constant period in terms of the rotation speed of the optical disk 12, the influence from the adjacent track can be effectively avoided.

Thus, in the optical disk device 10 (FIG. 1), by controlling the recording / reproducing timing, at the time of recording, the video signal and the audio signal are data-compressed by the encoder 51 in a format prescribed by MPEG. The data is converted into user data DU, and the user data DU is subjected to modulation processing in a predetermined ECC block unit. Further, when the optical disk 12 is a magneto-optical disk, the modulation coil driving circuit 56 irradiates the laser beam with the light amount of the laser beam intermittently raised from the optical head 11 at the timing synchronized with the write / read clock R / WCK. A modulation magnetic field is applied in accordance with the data of the ECC block subjected to the modulation processing at the position, whereby the thermomagnetic recording method is applied, and the maximum run length 2 is obtained by the shortest recording mark 4/3 bits.
T, and a mark having a minimum run length T are sequentially formed, and the user data D
U is recorded, and a video signal and an audio signal for 3 hours are continuously recorded.

When the optical disk 12 is of the phase change type or of the write-once type, the write / read clock R / W C
At the timing synchronized with K, the laser drive circuit 57 intermittently switches the light amount of the laser beam according to the data of the ECC block, thereby forming a similar pit row and a linear recording density of 0.21 [μm / bit]. , User data DU is recorded, and video signals and audio signals for three hours are recorded continuously.

As a result, in the optical disc device 10, the same usability as that of the video tape recorder is ensured with respect to the recording time.

At this time, in the optical disk device 10, 1
The user data DU of the ECC block is sequentially allocated to four sectors and recorded. At this time, the timing of the start of recording can be accurately detected by a highly accurate clock. Can be reliably recorded in the corresponding sector even when recording is performed on the optical disc 12 at a high density by an optical system having a high numerical aperture.

On the other hand, during reproduction, the optical disk device 10
In, the corresponding sector is detected in the same manner as during recording. A reproduction signal RF obtained from the optical head 11
Alternatively, after the MO is binarized, a reproduced clock is generated,
Reproduction data is sequentially obtained based on the reproduction clock, and the reproduction data is decoded and output. At this time, the reproduction signal MO obtained from the magneto-optical disk 12 is obtained with a smaller S / N ratio than the reproduction signal RF obtained from the pit train. However, in this embodiment, since the address area AR2 based on the pit row is formed radially in each zone, crosstalk with respect to the reproduced signal MO from this pit row is effectively avoided.

When accessing the optical disk 12 in this way, the optical disk device 10 uses the large-capacity memory 5.
4, user data is input and output between the encoder 51 and the decoder 52, and the optical disk 12
User data is recorded and reproduced intermittently at a data transfer rate higher than the data transfer rate between the encoder 51 and the decoder 52. As a result, user data can be recorded discretely in cluster units to secure a sufficient seek time, and continuous video and audio signals can be recorded without interruption even when detracking momentarily due to vibration or the like. Can be played. In addition, each program recorded on the optical disk 12 can be searched for and reproduced by pointer reproduction.

When the user selects the chase playback, multi-channel mode, or post-recording mode for simultaneously processing two-channel video and audio signals, the rotation speed of the optical disk 12 is switched to twice the normal rotation speed. Can be Thus, the optical disk device 1
In the case of 0, a sufficient vacant time is secured between accesses to the optical disk 12 for intermittently recording and reproducing the continuous video signal and audio signal on the optical disk 12 via the memory 54. In the optical disk device 10, the idle time is allocated to recording and reproduction of another channel and to the seek of the optical head 11, whereby video signals and audio signals of two channels are simultaneously processed.

That is, in the chasing reproduction, the video signal and the audio signal of one channel are
2 is intermittently recorded, and during this time, video and audio signals of other channels are intermittently reproduced from the optical disc 12. Further, the two-channel video signal and audio signal to be recorded and reproduced are continuously input / output to / from an external device via the memory 54.

In the multi-channel mode,
During recording, a two-channel video signal and an audio signal are continuously input to an external device via the memory 54, and the two-channel video and audio signals are alternately and intermittently input to the optical disk 12 Will be recorded. In reproduction, two-channel video signals and audio signals are reproduced from the optical disk 12 alternately and intermittently, and are continuously output to an external device via the memory 54.

Further, in the after-recording operation, one-channel video and audio signals are intermittently reproduced from the optical disk 12 and continuously output to an external device via the memory 54. Further, the video signal and the audio signal processed by the external device are continuously input to the memory 54, and the video signal and the audio signal are intermittently recorded at the original recording position.

As a result, in the optical disk device 10, in addition to the same usability as that of the video tape recorder, the usability more than that of the video tape recorder is secured by effectively utilizing the random access function unique to the optical disk.

When processing signals of two channels in this way, in the optical disk device 10, the rotation speed of the optical disk 12 is controlled by the ZCLV at twice the rotation speed in the normal mode in the recording side channel. On the other hand, for the other reproduction-side channels, the user data is reproduced at the rotation speed of the immediately preceding recording-side channel. Thus, in the optical disk device 10, when the optical disk 12 is accessed alternately for a plurality of channels, the frequency of switching the rotational speed of the optical disk 12 is reduced, and the access speed is improved accordingly.

(1-3) Effects of the First Embodiment According to the above configuration, the working distance 560
[Μm], land and groove recording at a linear recording density of 0.21 [μm / bit] through an optical system having a numerical aperture of 0.78 or more to record video signals and audio signals for 3 hours continuously. Video signal and audio signal can be recorded, and the same usability as a video tape recorder can be obtained.

At this time, by compressing and recording the video signal and the audio signal, the video signal and the audio signal can be efficiently recorded and reproduced.

Further, at this time, one system of user data based on the video signal and the audio signal is transferred to the optical disk 1 at a high data transfer rate via the buffer memory.
When recording and reproduction are intermittently performed on the optical disk 2, recording and reproduction of the optical disk are repeated, and when it is not possible to secure a continuous area on the optical disk, the video signal and the video signal and the The audio signal can be discretely recorded on the optical disk, and the information recording surface of the optical disk can be used effectively.

In the mode for processing the two-channel video signal and audio signal, the access speed to the optical disk 12 is set to twice the normal speed, so that the two-channel video signal and audio signal which are continuous with the external device are obtained. Are continuously input and output to and from the optical disc 12, these two-channel video and audio signals are alternately intermittently recorded and reproduced.
Recording and reproduction can be performed in the same manner as when recording and reproducing the video signal and audio signal of the channel individually.
As a result, it is possible to use the functions unique to the optical disk effectively to further improve the usability.

Further, when the two-channel video signal and audio signal are processed, the switching speed of the optical disk is stopped on the reproducing side, so that the access speed can be improved accordingly.

Also, by accessing the optical disk using the zone CLV, it is possible to record video signals and audio signals at high density by effectively using the information recording surface of the optical disk.

At this time, the diameter of the optical disk is set to 120
By setting [mm], the same usability as a compact disc can be obtained.

(2) Second Embodiment FIG. 22 is a plan view showing access to an optical disk by an optical disk device according to a second embodiment of the present invention in comparison with FIG. In this embodiment, the optical disk device accesses the optical disk 12 described in the first embodiment.

This optical disk device is the same as the optical disk device according to the first embodiment except that the processing procedure of the system control circuit when accessing the optical disk 12 is different in the multi-channel mode.

That is, in this embodiment, when the multi-channel mode is selected, the system control circuit sets the rotation speed of the optical disk 12 to twice the normal speed,
The optical disk 12 is accessed alternately in each channel.
At this time, the system control circuit 34 records the user data by alternately allocating the track, which is a free area of the optical disc 12, from the inner circumference to the outer circumference to each channel (FIGS. 22A to 22D). . In addition, the user data to which the tracks are allocated and recorded as described above is reproduced.

As described above, even if the user data is alternately recorded in track units, the same effect as in the first embodiment can be obtained.

(3) Third Embodiment FIG. 23 is a plan view showing an optical disc according to a third embodiment of the present invention in comparison with FIG. In the manufacturing process of the optical disk according to this embodiment, as in the first embodiment, a groove is formed, and the formation of the groove is interrupted at a predetermined angular interval to record address data using a pit string. At this time, in this embodiment, the address data of the sector by the following groove and the address data of the sector by the subsequent land are recorded in the first half and the second half of the address area AR2, respectively. Place on the center.

The optical disk device accesses the optical disk in the same manner as in the above-described first or second embodiment.

According to the structure shown in FIG.
The same effect as that of the embodiment can be obtained.

(4) Fourth Embodiment FIG. 24 is a plan view showing an optical disc according to a fourth embodiment of the present invention in comparison with FIG. In the manufacturing process of the optical disk according to this embodiment, as in the first embodiment, a groove is formed, and the formation of the groove is interrupted at a predetermined angular interval to record address data using a pit string. At this time, in this embodiment, the address data of the sector by the following groove and the address data of the sector by the subsequent land are respectively recorded in the first half and the second half of the address area AR2. A pit row is formed on the boundary between the land and the groove, respectively.

The optical disk device accesses the optical disk in the same manner as in the above-described first or second embodiment.

According to the structure shown in FIG.
The same effect as that of the embodiment can be obtained.

(5) Fifth Embodiment FIG. 25 is a plan view showing an optical disc according to a fifth embodiment of the present invention in comparison with FIG. In the manufacturing process of the optical disk according to this embodiment, when the groove is traced once, it follows the land on the outer peripheral side, and the land is moved by one.
Grooves and lands are alternately repeated in the circumferential direction of the optical disc so as to follow the groove on the outer peripheral side when tracing the track, so that the track by repeating the grooves and lands is 0.5.
It is formed at a pitch of [μm].

Further, the formation of the groove is interrupted at a predetermined angular interval, and the address data by the pit train is recorded. At this time, in this embodiment, the address area AR
In the first half and the second half of 2, the address data of the sector by the following groove and the address data of the sector by the following land are respectively arranged on the corresponding track centers.

According to the configuration shown in FIG. 25, the grooves and lands are alternately repeated in the circumferential direction of the optical disk, so that the tracks formed by repeating the grooves and lands become 0.5.
Even in the case of forming with a pitch of [μm], the same effect as in the first embodiment can be obtained, and the access frequency can be further reduced as compared with the first and second embodiments. .

(6) Sixth Embodiment FIG. 26 is a plan view showing an optical disc according to a sixth embodiment of the present invention in comparison with FIG. In the manufacturing process of the optical disc according to this embodiment, the grooves are formed sequentially so as to follow the land on the outer peripheral side when tracing the groove once, and to follow the groove on the outer peripheral side when tracing this land once. Further, the formation of the groove is interrupted at a predetermined angular interval, and the address data based on the pit string is recorded. At this time, in this embodiment, the address area AR
Address data is recorded in the first half part and the second half part of 2. At this time, each pit row is allocated to the boundary between the groove and the land, and is arranged so as to be offset between the first half and the second half.

According to the configuration shown in FIG. 26, the same effect as in the first embodiment can be obtained by applying the present invention to the case where land and groove are alternately connected to perform land / groove recording.

(7) Other Embodiments In the above-described embodiment, a case has been described in which 8 Kbytes of data are recorded in a pit row in one address area AR2, but the present invention is not limited to this. For example, data of 2K bytes, 4K bytes, or the like may be allocated.

Further, in the above-described embodiment, the case where the same address data ID is repeatedly recorded twice has been described. However, the present invention is not limited to this.
It may be repeated more than once or may be omitted.

Further, in the above-described embodiment, the case where the groove is meandered by the wobble signal without modulating the wobble signal has been described. However, the present invention is not limited to this. May be recorded together.

Further, in the above-described embodiment, a case has been described where the meandering period of the groove is sequentially changed stepwise by zoning. However, the present invention is not limited to this.
When the groove is meandered at a constant meandering cycle converted into the rotation angle, when the groove is converted so as to have a constant meandering cycle converted into the linear velocity, or when the groove meandering cycle converted into the linear velocity is converted to the optical disk, The present invention can also be applied to a case where it is changed stepwise in the radial direction.

In the first to fourth embodiments described above, the case where a pair of tracks formed by grooves and lands is helically described, but the present invention is not limited to this, and the present invention is not limited to this. A plurality of pairs of tracks may be formed in a spiral.

Further, in the fifth and sixth embodiments described above, a case has been described in which a land and a groove are switched every time a track makes one turn to form one track in a spiral shape. The present invention is not limited to this. One track may be formed in a spiral by switching lands and grooves at predetermined angular intervals, and a plurality of spiral tracks may be formed by repeating the land and the groove.

Further, in the above-described embodiment, the case where the grooves and pits are preformatted on the optical disk has been described. However, the present invention is not limited to this. Can be widely applied.

Further, in the above-described embodiment, the case where the entire groove is meandered by the wobble signal has been described. However, the present invention is not limited to this, and when only one edge of the groove is meandered, and both edges are different wobble signals. It can be widely applied to meandering by a signal.

Further, in the above-described embodiment, in land / groove recording, the track pitch is 0.5 [μ].
m], the present invention is not limited to this. The present invention can be widely applied to the case where grooves are formed with a narrow track pitch. That is, the track pitch is set to 0.64 [μm] or less according to the setting of the track pitch and the linear recording density, and the redundancy of data to be recorded, and 8 [G
B] can be secured.

In the above embodiment, the case where the thickness of the light transmitting layer is set to 0.1 [mm] has been described. However, the present invention is not limited to this, and the thickness of the light transmitting layer is set to 177 mm.
[Μm] or less, and a capacity of 8 [GB] can be secured. Incidentally, it is necessary to ensure that the thickness of the light transmitting layer is 10 [μm].

In the above embodiment, the case where user data is recorded at a linear recording density of 0.21 [μm / bit] has been described. However, the present invention is not limited to this, and the linear recording density is 0.23 [μm / bit]. [μm / bit], the same effect as in the above-described embodiment can be obtained. When this is converted into a bit length and a mark length, the shortest bit length and the shortest mark length are 0.3 [μm]
Is an acceptable range. Incidentally, the present invention can be widely applied to modulation schemes such as 8-16 conversion.
According to the 6 conversion, the maximum run length is 3T and the minimum run length is 1T, and the shortest pit length and shortest mark length are 3 /
It becomes 2 bits.

In the above embodiment, the wavelength 6
Although the case where a laser beam of 50 [nm] is irradiated by an optical system having a numerical aperture of 0.78 to record and reproduce a video signal and the like has been described, the present invention is not limited to this, and the video signal is not limited to an optical system having a high numerical aperture. And the like can be widely applied when recording at high density. In consideration of the thickness of the light transmitting layer, the achievable working distance, and the like, an effect similar to that of the above-described embodiment can be obtained when the numerical aperture is 0.78 or more and the working distance is 560 [μm] or less. .

Further, in the above-described embodiment, the case where the present invention is applied to a recordable optical disk has been described. However, the present invention is not limited to this, and can be applied to a read-only optical disk.

In the above-described embodiment, the case where video signals and audio signals are recorded at a high density on an optical disk and the user data is reproduced at the rotation speed during recording and reproduction when recording and reproduction are repeated has been described. ,
The present invention is not limited to this, and can be widely applied to the case where various data are recorded / reproduced, and the case where recording / reproduction is repeated with respect to optical disks currently distributed in the market.

[0213]

According to the above construction, the diameter is 120 [m
m], and a working distance of 560 for an optical disc whose light transmission layer is set to a thickness of 10 to 177 [μm].
[Μm] The shortest pit length or the shortest mark length 0.3 [μm] through an optical system having a numerical aperture of 0.78 or more set to be equal to or less than [μm].
By recording the desired video signal and audio signal in the following, the features of the optical disk can be effectively used, and a long program can be recorded.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an optical disc device according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing an optical disk mastering device applied to the optical disk device of FIG. 1;

FIG. 3 is a plan view for describing zoning by the mastering device in FIG. 2;

FIG. 4 is a schematic diagram illustrating a configuration of a sector by zoning in FIG. 3;

FIG. 5 is a perspective view showing an optical disc generated by the mastering device of FIG. 3;

FIG. 6 is a block diagram mainly showing a drive system of the optical disk device of FIG. 1;

FIG. 7 is a schematic diagram illustrating an optical head of the optical disk device of FIG. 1;

8 is a cross-sectional view illustrating a configuration around an objective lens of the optical head of FIG. 7;

9 is a characteristic curve diagram for explaining the driving of the optical disk by the optical disk device of FIG. 6;

FIG. 10 is a flowchart illustrating a processing procedure of a system control circuit in the optical disc device of FIG. 6;

FIG. 11 is a table provided for explaining a sector structure in the optical disk device of FIG. 1;

FIG. 12 is a table showing ECC blocks in the optical disc device of FIG. 1;

FIG. 13 is a table provided for explaining a frame structure in the optical disc device of FIG. 1;

FIG. 14 is a schematic diagram showing flows of a video signal and an audio signal of two channels in the optical disk device of FIG. 1;

FIG. 15 is a schematic diagram for explaining an operation in a normal recording / reproducing operation of the optical disc device in FIG. 1;

FIG. 16 is a schematic diagram used to explain an operation in chasing playback of the optical disc device in FIG. 1;

FIG. 17 is a characteristic curve diagram for explaining the driving of the optical disc when processing two-channel video and audio signals in the optical disc apparatus of FIG. 1;

FIG. 18 is a schematic diagram for describing an operation in a multi-channel mode of the optical disc device of FIG. 1;

FIG. 19 is a schematic diagram for explaining the operation of the optical disc device of FIG. 1 in after-recording.

FIG. 20 is a block diagram illustrating a relationship with an external device during post-recording.

FIG. 21 is a schematic diagram for explaining an operation in reproducing a pointer of the optical disc device in FIG. 1;

FIG. 22 is a schematic diagram for describing an operation in a multi-channel mode of the optical disc device according to the second embodiment.

FIG. 23 is a plan view for explaining sectors by the mastering device according to the third embodiment of the present invention.

FIG. 24 is a plan view for explaining a sector by a mastering device according to a fourth embodiment of the present invention.

FIG. 25 is a plan view for explaining a sector by a mastering device according to a fifth embodiment of the present invention.

FIG. 26 is a plan view for explaining a sector by a mastering device according to a sixth embodiment of the present invention.

[Explanation of symbols]

1 ... mastering device, 2 ... master disk, 5 ...
Drive circuit, 6 ... Address signal generation circuit, 7 ... Wobble signal generation circuit, 10 ... Optical disk drive, 11 ...
Optical head, 12 optical disk, 35 PLL circuit,
37: an address detection circuit, 39: a wobble signal processing circuit

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-9-245412 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B 19/02 G11B 20/10

Claims (2)

(57) [Claims] 1. A light transmitting layer having a diameter of 120 mm and a thickness of 1 mm.
An access method of an optical disk for recording desired data on an optical disk of 0 to 177 [μm] according to the ZCLV method, wherein input signals of two systems are input in parallel and alternately to the optical disk by switching operation modes. And alternately playing back different areas on the optical disc to
A process of outputting system output signals simultaneously and in parallel, and recording and reproduction of data on the optical disk are alternately repeated, and a system output signal reproduced from the optical disk is output while a system input signal is output from the optical disk. In the alternate recording / reproducing, when the optical disc is rotated at a rotation speed according to a recording position to record the data, and then, an area different from the recording position is reproduced. Even if there is, the different area is reproduced while maintaining the rotation speed of the optical disk at a rotation speed corresponding to the recording position. 2. In the alternate recording / reproducing, the recording area of one buffer memory is sequentially and cyclically switched to temporarily hold the data, and the data is input / output between an encoder / decoder and the buffer memory. The optical disk access method according to claim 1, wherein the data is input / output between the optical disk and the buffer memory.