JP2000285508A - Optical recording and reproduction system, optical recording medium, and optical recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical recording and reproducing device which can improve the transfer speed. SOLUTION: This optical recording and reproducing device consists of two optical heads 15 and 16 which correspond to 1st and 2nd stacked recording layers, a recording data controller 27 which divides original information into two and records the divided pieces of information on the 1st and 2nd recording layers respectively, and a reproduced data controller 28 which reproduces the divided pieces of information out of the 1st and 2nd recording layers and puts them together into the original information.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an optical recording medium, an optical recording / reproducing method and an optical recording / reproducing apparatus, and more particularly to an optical recording medium having a multilayer recording layer, an optical recording / reproducing method and an optical recording / reproducing apparatus using the same. .

[0002]

2. Description of the Related Art In an optical recording medium, for example, a DVD-RAM which is a rewritable optical disk of a phase change system, information is recorded by changing the intensity of light to be focused and irradiated on the disk to form a phase change mark array. Do. On the other hand, reproduction of information is performed by condensing and irradiating light of a constant intensity onto the disk and detecting a phase change mark array from the amount of reflected light.

[0003] Guide grooves (groups) are formed on the disk, and information is recorded / reproduced by scanning irradiation light along the grooves, and both inside and between the grooves are used as recording tracks. The recording tracks are spirally continuous from the inner circumference to the outer circumference of the disk, and information is recorded on the entire surface of the disk. DVD-RAM standard Ver. In 1.9, the capacity that can be recorded on one surface of the disk is 4.7 GB. The disk is divided into 35 zones by radius, and by performing recording / reproducing while changing the number of revolutions for each zone, substantially the same linear density is realized regardless of the radial position. Data transfer rate is 22.16 regardless of radial position
Mbps, so that the relative speed between the disk and the irradiating light slightly changes between the inner and outer peripheries of the zone.
It is almost equal to 8.49 m / s.

[0004]

By the way, DVD-R
A main application of AM is recording / reproduction of moving images. The data transfer rate of 22.16 Mbps on the disk is usually sufficient to handle moving picture data compressed by the MPEG2 system. Deterioration occurs.
Therefore, for example, in an editing operation at a broadcasting station or the like, a transfer speed about twice as high is required. In order to improve the transfer speed, it is conceivable to improve the linear recording density and the number of rotations. Realization is not easy. As described above, in the conventional optical recording / reproducing method, it is difficult to improve the transfer speed.

The present invention makes it possible to improve the transfer speed.
It is an object to provide an optical recording / reproducing device.

[0006]

SUMMARY OF THE INVENTION The present invention relates to an optical recording / reproducing system for recording information on an optical recording medium having a plurality of laminated recording layers and reproducing the information recorded on the optical recording medium. An optical recording / reproducing method is provided, wherein information is simultaneously recorded / reproduced on / from a plurality of recording layers by a plurality of optical recording / reproducing means.

The original information to be recorded on the optical recording medium is divided into at least two parts, the divided information is recorded on different recording layers, and the divided information reproduced from each recording layer is synthesized to form the divided information. Generate source information.

[0008] The recording layers on which the optical recording medium is stacked have the same zone structure, and the divided information is recorded in the same zone of each of the different recording layers.

The different recording layers have the same sector structure, and the division information is recorded in the same numbered sector of the recording layer.

The present invention provides an optical recording medium having at least two laminated recording layers, wherein the laminated recording layers have the same sector structure and spiral direction.

According to the present invention, in an optical recording medium having a plurality of laminated recording layers, the recording layers are laminated so as to have different header positions in the circumferential direction according to the arrangement of the plurality of optical recording / reproducing means. An optical recording medium is provided.

According to the present invention, there is provided an optical recording / reproducing apparatus for recording information on an optical recording medium having at least two laminated recording layers and reproducing the information recorded on the optical recording medium. At least two optical recording / reproducing means respectively corresponding to the layers; division information creating means for dividing the original information into at least two parts; a recording mode for recording the divided information on the different recording layers; Control means for controlling the optical recording / reproducing means for selectively performing a reproducing mode for reproducing the divided information, and original information generating means for generating the original information by synthesizing the reproduced divided information. An optical recording / reproducing apparatus is provided.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) According to an optical recording / reproducing apparatus shown in FIG.
Reference numeral 1 denotes a single-sided, two-layer structure in which two phase-change recording films, the same as a DVD-RAM, are stacked, and a transparent layer 14 is provided between a lower first recording layer 12 and an upper second recording layer 13. Is interposed. That is, the first and second recording layers 12 and 13 are
Are interposed.

On one side of the optical disk 11, two optical heads 15, 16 are arranged at substantially the same radial position on the optical disk. Each of these optical heads 15 and 16 is
Irradiation light 17, 18 is applied to the first and second recording layers 12, 13.
Are respectively focused. Specifically, the optical heads 15 and 16 are composed of, for example, first and second light sources 19 and 20 composed of laser diodes, beam splitters 21 and 22, objective lenses 23 and 24, and photodetectors 25 and 26. . These optical heads 15, 1
The six objective lenses 23 and 24 are adjusted so that the irradiation lights 17 and 18 are focused on the first and second recording layers 12 and 13.

The light sources 19 and 20 of the optical heads 15 and 16 are connected to a recording data controller 27,
26 is connected to a reproduction controller 28. The recording data controller 27 and the reproduction data controller 28 are connected to the main controller 29 and control recording and reproduction.

The main controller 29 includes a servo unit 30
And controls the rotation speed of the optical disk 11 rotated by the motor 31.

The operation of recording information on the optical disk 11 and reproducing the recorded information from the optical disk 11 using the optical disk apparatus having the above-described configuration will be described.

At the time of information recording, the recording data controller 27 divides the original recording data (original data) 30 input from the main controller 29 into two, and generates first divided recording data 31 and second divided recording data 32. Then, the intensity of the light sources 22 and 23 is modulated according to the divided recording data.
The modulated irradiation light from the light sources 22 and 23 is applied to the beam splitter 2
The light is focused on the first and second recording layers 12 and 13 of the optical disc 11 by the objective lenses 23 and 24 via the first and second lenses 22, respectively. At this time, the irradiation lenses 17 and 18 are focused on the first and second recording layers 12 and 13, respectively, and the objective lenses 12 and 13 are controlled by a well-known focus controller and tracking controller (not shown) so as to perform tracking. Is done. As a result, the first divided recording data 31 and 32 are simultaneously recorded on the first and second recording layers 12 and 13.

At the time of information reproduction, when the irradiation light for reproduction is focused on the first and second recording layers 12 and 13, the first and second photodetectors 25 and 26 are turned on by the first and second recording layers 12, 1 and 2, respectively.
First and second divided reproduction data 33 and 34 corresponding to the intensity of the reflected light from No. 3 are simultaneously generated. These divided reproduction data 33 and 34 are combined by the reproduction data controller 28 to generate final reproduction data 35.

FIG. 2 shows an example of the relationship between the original data and the first and second divided data. According to this, the time series of the original data is divided into two in a predetermined unit (for example, a sector unit), and each divided data is generated. That is, the original data is data A1, A2, B1. The data A1 and B1 are distributed to the first divided data 31, and the data A2 and B2 are distributed to the second divided data 32. In this manner, the original data is divided into two and recorded on two recording layers, that is, the first and second recording layers.

The recorded divided data A1, A2 and B
1, B2 are reproduced according to the same rules as recording, that is, in the same order, and are combined into one. This allows
The transfer speed in recording and reproduction of both divided data is １ ／ of the transfer speed of the original data.

In the case of phase-change optical recording, information is rewritten by utilizing the crystallization phenomenon of a recording material. Therefore, if the relative moving speed between the recording medium and the irradiation light is too high, high temperature for crystallization will occur. The information cannot be rewritten because the holding time is insufficient. This is the transfer speed restriction due to the linear speed dependence of the medium recording characteristics described in the conventional example. However, in the present invention, this restriction is applied to the divided data recorded on the two recording layers of the optical disk, and the original data as a whole can be recorded and reproduced at twice the transfer speed.
The unit of data division in FIG. 2 is, for example, for each sector, but it is possible to use a shorter bit unit or byte unit, a longer track one round unit, an ECC block unit, or the like. Furthermore, both a case where data is divided after scrambling and a case where scramble is applied to the divided data can be adopted.

FIG. 3 shows a single-sided, double-layer recording medium used in the present embodiment. This single-sided, double-layer recording medium is prepared by forming a phase-change medium on a substrate provided with irregularities such as grooves and pre-pits under conditions suitable for each layer, and bonding them together with a transparent layer in between. Can be manufactured.

In the present embodiment, the sector structure of both recording layers, that is, the number of zone divisions determined by the grooves and prepits provided in both recording layers, the number of tracks in each zone, and the number of sectors in each track are the same. The direction of the spiral is the same. Therefore, the original data to be recorded on the optical disc is divided into the divided data A in both recording layers.
When recording as A1 or A2, if the same numbered zone of both recording layers is selected, recording can be performed on both recording layers at the same rotation speed. Therefore, after recording on one recording layer, recording is performed on the other recording layer. There is no need to wait for the number of revolutions to be changed before.

Further, by using the sectors having the same number in both recording layers for recording the divided data to be combined, data management is facilitated, and zone switching is performed even in continuous sector recording across zones. Since the layers are generated at the same time, the rotational speed change waiting time due to the zone mismatch between the two recording layers does not occur.

In FIG. 3, the sectors having the same number of the first recording layer and the second recording layer for recording a set of divided data are superimposed on each other so that they have substantially the same arrangement. In this case, for example, in a device in which the optical head 1 for recording and reproducing on the first recording layer and the optical head 2 for recording and reproducing on the second recording layer are opposed to each other, the sector having the same number in both recording layers is used. Recording and reproduction timings are shifted by 1/2 rotation time. Therefore, if it is known that the arrangement of the optical heads is opposed to each other, the two recordings are arranged so that the sectors of the same number of the first recording layer and the second recording layer are shifted by 周 as shown in FIG. By using a layered disk, the amount of memory and latency required to absorb the timing shift can be saved.

(Second Embodiment) FIG. 5 shows the first and second embodiments.
1 shows an optical recording / reproducing apparatus in which optical heads 15a and 16a are provided close to the same side of the optical disk 11 instead of being opposed in the radial direction. In this case, rather, both recording layers 12,
Thirteen disks with the same arrangement can save the aforementioned memory capacity and waiting time. In this embodiment, the first and second optical heads 15a and 16a scan the same numbered sectors. However, in the apparatus shown in FIG. It is possible to adopt a system in which the moving mechanism is shared and only the difference in the eccentricity of the two recording layer tracks is followed by the respective lens actuators.

In the above embodiment, the disk is
The case of recording and reproducing the data in the ZCLV system same as that of the D-RAM, that is, changing the rotation speed for each zone has been described. As described above, this is a method in which the recording linear velocity is kept substantially constant and good medium characteristics are maintained, and the present invention is naturally applicable to a CLV method in which the number of revolutions is changed for each track.
Also, if the medium has a wide usable linear velocity range and can record from the inner circumference to the outer circumference of the disk at the same rotation speed, the CAV method with a constant rotation speed and a constant data transfer speed, and a constant rotation speed for each zone. Even in the ZCAV system in which the linear recording density is substantially constant by changing the data transfer speed, the application of the present invention can improve the entire data transfer speed to the sum of the transfer speeds of the first and second layers.

(Third Embodiment) In both CA5 and ZCAV, the disk rotation speed is constant regardless of the radius.
(A) The first recording layer and the second recording layer have a spiral in the same direction, that is, both recording layers are sequentially recorded and reproduced from the inner periphery to the outer periphery. The spiral may be reversed in the second recording layer, for example, the first recording layer 12 may be recorded and reproduced in order from the inner periphery to the outer periphery, and the second recording layer 13 may be recorded and reproduced sequentially from the outer periphery to the inner periphery. In particular, in the ZCAV system, the transfer speed can be reduced only on the inner circumference of the disk, but can be increased on the outer circumference, so that the first recording layer 12 and the second recording layer 13 can be increased.
By setting the spiral in the reverse direction, it is possible to set the transfer rate as a whole, which is the sum of the transfer rates of both layers, to be constant. In this case, however, as shown in FIG. 6C, the ratio of the divided data to the two recording layers is not fixed to 1: 1 but the first recording layer 12 according to the transfer speed ratio between the two recording layers.
When the inner circumference, that is, the second recording layer 13 records and reproduces the outer circumference, the division ratio of the data for the second recording layer is higher than that for the first recording layer, and conversely, the first recording layer 12 is the outer circumference, that is, the second recording layer. When recording / reproducing the inner circumference, the original data division / synthesis ratio control that makes the division ratio of the data for the first layer higher than that for the second layer is required.

In the above embodiment, the optical disk is placed on one side 2
The case where the original data is divided into two and recorded / reproduced is described in the case of the layer structure. In the present invention, it is needless to say that the transfer rate can be increased by further dividing the data using a multilayer medium having three or more layers on one side or a multilayer medium on both sides.

[0031]

As described above, according to the present invention, it is possible to provide an optical recording / reproducing apparatus having an optical recording / reproducing function capable of improving the transfer speed.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an optical recording / reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating the relationship between original data and divided data according to the first embodiment of the present invention.

FIG. 3 is a perspective view of a single-sided two-layer medium according to the first embodiment of the present invention.

FIG. 4 is a perspective view showing an arrangement of an optical head according to the first embodiment of the present invention.

FIG. 5 is an explanatory diagram of another optical head arrangement according to the second embodiment of the present invention.

FIG. 6 is a view for explaining a recording / reproducing apparatus according to the first embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 ... Optical disk 12 ... 1st recording layer 13 ... 2nd recording layer 14 ... Transparent layer 15 ... 1st optical head 16 ... 2nd optical head 17 ... 1st irradiation light 18 ... 2nd irradiation light 19 ... 1st light source 20 ... 2nd light source 23 ... 1st objective lens 24 ... 2nd objective lens 25 ... 1st photodetector 26 ... 1st photodetector 27 ... record data controller 28 ... reproduction data controller

Continuing on the front page (72) Inventor Yutaka Okamoto 1 Toshiba-cho, Komukai-shi, Kawasaki-shi, Kanagawa Prefecture Inside the Toshiba R & D Center Co., Ltd. Toshiba Research & Development Center Co., Ltd. (72) Inventor Toshino Sugaya 1 Tokoba, Komukai Toshiba-cho, Saiwai-ku, Kawasaki City, Kanagawa Prefecture F-term (reference) 5D029 JB05 JB45 5D090 AA01 BB05 BB12 FF21 GG11 5D119 AA10 AA24 BA01 BB04 BB13 CA12

Claims (8)

[Claims] 1. An optical recording / reproducing method for recording information on an optical recording medium having a plurality of laminated recording layers and reproducing the information recorded on the optical recording medium, comprising: An optical recording / reproducing method for simultaneously recording / reproducing information on / from the recording layer. 2. The method according to claim 1, wherein the original information to be recorded on the optical recording medium is divided into at least two parts, the divided information is recorded on different recording layers, and the divided information reproduced from each recording layer is synthesized. 2. The optical recording / reproducing method according to claim 1, wherein the original information is generated by performing the following. 3. The recording layer according to claim 1, wherein the recording layers on which the optical recording medium is stacked have the same zone structure, and the divided information is recorded in the same zone of each of the different recording layers. 2. The optical recording / reproducing method according to 2. 4. The optical recording / reproducing apparatus according to claim 3, wherein the stacked recording layers have the same sector structure, and the divided information is recorded in the same numbered sectors of the different recording layers. method. 5. An optical recording medium having at least two laminated recording layers, wherein the laminated recording layers have the same sector structure and spiral direction. 6. The optical recording medium according to claim 5, wherein the stacked recording layers have different arrangement structures in a circumferential direction. 7. An optical recording / reproducing apparatus which records information on an optical recording medium having at least two laminated recording layers and reproduces information recorded on the optical recording medium, wherein: At least two optical recording / reproducing means respectively corresponding thereto, division information creating means for dividing the original information into at least two parts, a recording mode for recording the division information on each of the different recording layers, and the division information from the recording layer. A light control unit for controlling the optical recording / reproducing means for selectively performing a reproduction mode for reproduction; and an original information generating means for generating the original information by synthesizing the reproduced divided information. Recording and playback device. 8. The stacked recording layers have different arrangement structures in the circumferential direction, and the recording / reproducing means are arranged in a positional relationship according to the arrangement structure of the recording layers. Item 8. The optical recording / reproducing device according to Item 7.