JPH10326460A - Information recording medium, information recorder, and information reproducer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the reproducing speed and retrieval performance at the time of reproducing data. SOLUTION: The information recording and reproducing device 10 read out main data recorded in one side of a recording track formed in a spiral state of two lines in a disk type recording medium 1 and auxiliary data recorded in the other side. A storage means 15 stores data read out from a read-out means. A synthesizing means 18 reads out main data stored in the storage means 15 and auxiliary data and synthesizes them. A switching means 19 switches whether only main data is outputted from the storage means 15 or synthesized data outputted form the synthesizing means 18 is outputted. In thus information recording and reproducing device 10, when only main data is reproduced based on the switching means 19, easiness for retrieving is improved by high speed reproduction by reading out only data recorded in one side of a recording track of the disk type recording medium 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording medium with improved reproduction magnification and searchability of recorded information, an information recording apparatus using the information recording medium, and an information reproducing apparatus.

[0002]

2. Description of the Related Art In recent years, various digital data recording media have been put into practical use. For example, a floppy disk system or a hard disk system for recording and reproducing digital data using a magnetic disk, a read-only disk system using an optical disk, or an optical disk. 2. Description of the Related Art Various types of disk systems, such as a disk system in which a user can record and reproduce audio data using a magnetic disk as a recording medium, are known. In these recording media, such as magnetic disks, optical disks, and magneto-optical disks, developments for increasing the density of the recording media have been actively pursued in order to improve the storage capacity.

For example, even in a disk system using a small optical disk or a magneto-optical disk having a diameter of 64 mm, development to improve the recording density on the disk in order to record and reproduce a large amount of data such as a still image and a moving image. Is being promoted.

[0004]

However, in a disk system using an optical disk or a magneto-optical disk as a recording medium in which recording tracks are continuously formed in a spiral (spiral, spiral) form, data is reproduced from the recording medium. It has been pointed out that there is a limit in increasing the reproduction speed in such a case. That is, in such a disk system, when all recorded video data and the like are read out by high-speed reproduction and search is performed,
Problems such as limitations on the reproduction magnification will occur.

In a disk system using a small optical disk or a magneto-optical disk having a diameter of 64 mm as described above, the recording track is formed continuously in a spiral shape. Even if the video data can be recorded by increasing the density and increasing the density, problems such as limitations on the reproduction magnification when searching for recorded video data or performing high-speed reproduction etc. As a result, there is a problem that data search cannot be performed quickly.

The present invention has been proposed in view of such circumstances, and provides an information recording medium, an information recording apparatus, and an information reproducing apparatus that can easily perform high-speed reproduction and high-speed retrieval of data. With the goal.

[0007]

In order to solve the above-mentioned problems, an information recording medium according to the present invention has recording tracks formed in two rows of spirals, and one recording track records main data. And the other recording track is an auxiliary track for recording auxiliary data for assisting the main data.

In the information recording medium, high-speed reproduction and high-speed retrieval of data can be easily performed by reproducing only the main track.

Further, in order to solve the above-mentioned problems, the information recording apparatus according to the present invention has a separating means for separating data to be recorded into main data and auxiliary data for assisting the data in advance.
Storage means for storing each data separated by the separation means; recording means for reading each data from the storage means and recording the data on two spirally formed recording tracks of a disk-shaped recording medium; And control means for controlling the operation of.

In the information recording apparatus, the control means records the main data on one recording track of the disc-shaped recording medium and the auxiliary data on the other recording track of the disc-shaped recording medium. Control the operation of the means.

Further, in order to solve the above-mentioned problems, an information reproducing apparatus according to the present invention has a main data recorded on one of two spirally formed recording tracks of a disk-shaped recording medium and a main data recorded on the other. Reading means for reading the auxiliary data, storage means for storing the data read by the reading means, synthesizing means for reading and synthesizing the main data and auxiliary data stored in the storage means, Switching means for switching whether to reproduce only data or to reproduce synthesized data output from the synthesizing means.

In the information reproducing apparatus, the switching means reproduces only the main data, so that only the data recorded on one of the recording tracks of the disc-shaped recording medium is read out by the reading means. Is improved.

[0013]

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

As shown in FIG. 1, a magneto-optical disk 1 according to an embodiment to which the information recording medium of the present invention is applied has a recording area composed of two recording tracks 3 and 4 on a main surface of a disk substrate 2. 5 and grooves 6, 7 are formed continuously in a spiral.

The disk substrate 2 is formed of a polycarbonate resin into a disk having a diameter of, for example, 64 mm and a thickness of 1.2 mm. Note that a dielectric layer, a recording layer (magneto-optical layer), a reflective layer, a protective film, and the like (not shown) are formed on the main surface of the disk substrate 2.

The recording tracks 3 and 4 are spirally formed in two rows on the main surface of the disk substrate 2. The recording tracks 3 and 4 have the same track width, and a pair forms a recording area 5 in which data to be recorded and reproduced is recorded.

In this embodiment, the recording track 3 is a main track for recording main data which is a skeleton of data to be recorded and reproduced, and the recording track 4 is for recording additional data. This is an auxiliary track for recording.

When video data based on a moving image is recorded on the magneto-optical disk 1 as data to be recorded and reproduced, data of a low-frequency component of the video signal is recorded on the recording track 3 and the video signal of the video signal is recorded on the recording track 4. It is assumed that the data of the high frequency component is recorded.

When image data based on a still image is recorded on the magneto-optical disk 1 as data to be recorded and reproduced, for example, the original image data is recorded on the recording track 3 and the original image data is recorded on the recording track 4. Auxiliary data such as a background image and a title may be recorded.

In the magneto-optical disk 1, each recording track is configured as described above, so that the recording / reproducing apparatus 10 described later reproduces only the recording track 3 which is a main track, thereby achieving high-magnification reproduction and high-speed retrieval. It can be facilitated. Hereinafter, the recording track 3 as the main track is referred to as track A, and the recording track 4 as the auxiliary track is referred to as track B.

The grooves 6 and 7 are enlarged views of a part of the main surface and a part of the cross section of the magneto-optical disk 1, respectively.
As shown in (b) and (b), a concave portion is provided on the main surface of the disk substrate 2, thereby separating the A track and the B track. In the grooves 6 and 7, the groove 6 has a meandering sinusoidal shape.
Has no meandering shape. With such a configuration, in the magneto-optical disk 1, the track pitches of the A track and the B track can be made smaller than when both grooves are meandering in a sine wave shape.

The rotation speed of the magneto-optical disk 1 can be controlled by the groove 6 based on the sinusoidal fundamental frequency in the meandering shape. In the groove 6, the fundamental frequency is subjected to frequency modulation such that the absolute position address information is displayed over the entire circumference of the disk. Therefore, the groove 6 has a function as an address information groove on the magneto-optical disk 1.

On the other hand, since the groove 7 is a so-called DC groove without such a meandering shape, it does not have a function of controlling the disk rotation speed in the groove 6 and displaying an absolute position address.

Next, an embodiment of an information recording / reproducing apparatus using such a magneto-optical disc 1 will be described. It is to be noted that the blocks constituting the recording side of the information recording / reproducing apparatus will be described first, and then the blocks constituting the reproducing side will be described.

As shown in FIG. 3, the recording / reproducing apparatus 10
The block on the recording side includes a signal band dividing / encoding unit 11, a memory 12, and a CPU for controlling the entire apparatus.
(Central Processing Unit) 13, a spindle motor SM, and a recording / reproducing unit 14.

The signal band division / encoding unit 11
Based on the control signal from U13, the video signal input from the outside is divided into a low-frequency component and a high-frequency component, and an encoding process is performed on each of the divided video signals. The signal band dividing / encoding unit 11 divides the video signal so that the low-frequency component and the high-frequency component have the same data amount. Each of the divided video signals is supplied to the memory 12 as low-frequency component data and high-frequency component data after encoding processing.

The memory 12 stores the low-frequency component data and the high-frequency component data supplied from the signal band dividing / encoding unit 11 in different areas. The low-frequency component data and the high-frequency component data stored in the memory 12 are alternately supplied to the recording / reproducing unit 14 at regular time intervals under the control of the CPU 13.

The recording / reproducing unit 14 includes an optical head (not shown), a magnetic field head, an optical pickup, a servo circuit, and the like. The optical head and the magnetic field head are arranged at positions facing each other with the magneto-optical disk 1 interposed therebetween. . The optical head is used for recording / reproducing data on any one of AB of the magneto-optical disk 1.
And the grooves 6 and 7 on both sides thereof are irradiated with laser light from below. In this embodiment, as shown in FIG. 2A, a main beam MB for detecting data and side beams SB arranged obliquely before and after the main beam MB for detecting the positions of the grooves 6 and 7 are arranged. An optical head by a so-called three-spot method is used.

The magnetic field head applies a magnetic field modulated by data supplied from the memory 12 to the A
B is applied from above to any one track. Therefore, each data which is alternately supplied from the memory 12 to the recording / reproducing unit 14 at regular intervals is recorded on one of the tracks AB on the magneto-optical disk 1 by the magnetic field head. In this recording / reproducing apparatus 10, low-frequency component data is recorded on track A of the magneto-optical disk 1, and high-frequency component data is recorded on track B.

The optical pickup detects the reflected light of the laser light applied to the magneto-optical disk 1 by the optical head. The reproduction signal based on the detection light from the optical pickup is sent to the CPU 13 and the memory 15 described in detail later.

The servo circuit moves the optical head and the magnetic field head in the tracking direction and the focus direction based on the control signal of the CPU 13.

The spindle motor SM drives the magneto-optical disk 1 to rotate at a predetermined rotation speed based on a control signal from the CPU 13.

The CPU 13 records data on tracks A and B of the magneto-optical disk 1 by performing the following control on each block. CPU 13
Outputs a control signal to the signal band dividing / encoding unit 11 and divides an externally input video signal into low-frequency components and high-frequency components so as to have approximately the same capacity,
The signal band dividing / encoding unit 11 is controlled so that the divided signals are encoded and then supplied to the memory 12 as low-frequency component data and high-frequency component data, respectively.

The CPU 13 has a spindle motor S
A control signal is output to M to rotate the magneto-optical disk 1 at a predetermined rotation speed. Further, the CPU 13 outputs a control signal to the recording / reproducing unit 14 to output a laser beam from the optical head. Thereby, the magneto-optical disk 1 is
The magneto-optical layer rises above the Curie temperature, and the magnetization disappears. Then, the CPU 13 controls the servo circuit so that the magnetic field head is positioned on the track A of the magneto-optical disk 1 and supplies the low-frequency component data stored in the memory 12 to the magnetic field head of the recording / reproducing unit 14. To Subsequently, the CPU 13 controls the servo circuit so as to position the magnetic field head on the track B of the magneto-optical disk 1 and supplies the high frequency component data stored in the memory 12 to the magnetic field head of the recording / reproducing unit 14. To do.

By such control, the recording / reproducing apparatus 10
In, the low-frequency component data of the video signal is recorded on track A of the magneto-optical disk 1, and the high-frequency component data is recorded on track B.

Next, the blocks constituting the reproducing side of the recording / reproducing apparatus 10 will be described.

The recording / reproducing apparatus 10 has a memory 15 for storing the reproduced data read by the optical pickup.
And a first decoder 16 for reading and decoding low-frequency component data from the memory 15, a second decoder 17 for reading and decoding high-frequency component data from the memory, and outputs from the respective decoders 16 and 17. A synthesizing circuit 18 for synthesizing signals and a switching section 19 for switching between an output signal from the synthesizing circuit 18 and an output signal from the first decoder 16 and outputting the same to the outside are provided.

The optical pickup, for example, puts a 0. 0 track on the A track or B track of the magneto-optical disk 1 during reproduction.
The reproduction data is read by irradiating a laser beam of about 5 milliwatts and detecting the reflected light.

The memory 15 stores reproduction data read by the optical pickup.
3 so that the low-frequency component data, which is the reproduction data read from track A, and the high-frequency component data, which is the reproduction data read from track B, are stored in different areas based on the control signal from track 3. Has become.

The first decoder 16 reads low frequency component data from the memory 15 based on a control signal from the CPU 13 and decodes the data to convert the data into a low frequency component video signal. Then, the first decoder 16
Outputs the low-frequency component video signal to both the terminal a of the switching unit 19 and the synthesizing circuit 18.

The second decoder 17 reads out high frequency component data from the memory 15 based on the control signal of the CPU 13 and decodes the data, thereby converting the data into a high frequency component video signal. Then, the second decoder 17 outputs the video signal of the high frequency component to the synthesizing circuit 18.

The synthesizing circuit 18 generates an original video signal by synthesizing the video signals output from the first decoder 16 and the second decoder 17, and converts this video signal into a terminal b of the switching section 19. Output to

The switching section 19 switches the video signal to be output by setting the terminal to be connected to either a or b based on the control signal from the CPU 13. As a result, in the recording / reproducing apparatus 10, when the terminal a is set, only the low-frequency component video signal serving as a frame is reproduced, while when the terminal b is set, the original video signal is reproduced. Will be done.

Hereinafter, the operation of the recording / reproducing apparatus 10 during reproduction will be described. When performing normal reproduction in which the original video signal is output as it is in the recording / reproducing apparatus 10, the track A of the magneto-optical disk 1 is read out for a certain period of time and supplied to the memory 15, and then the track B is read out for a certain period of time and is read out of the memory And then repeat this operation. In the case of this normal reproduction, the terminal b is set in the switching section 19 under the control of the CPU 13.

On the other hand, when the recording / reproducing apparatus 10 reproduces only the low-frequency component, it is sufficient to always read only the track A of the magneto-optical disk 1 and supply the reproduced data to the memory 15, so that the optical head is moved to the track B There is no need to change it, high-speed playback is possible, and the search magnification can be increased. Specifically, when reproducing only low-frequency components in the recording / reproducing apparatus 10, the B
Since there is no need to reproduce the track and the time required for switching between the A and B tracks is eliminated, the reproduction can be performed at a data rate twice or more that of the normal reproduction.

In this embodiment, a magneto-optical disc on which data can be written is used as the information recording medium. However, the present invention can of course be applied to a read-only optical disc.

Further, in this embodiment, a magneto-optical disk 1 of a type in which two recording tracks 3 and 4 serve as lands and a recording area 5 is divided by a groove as an information recording medium. However, the present invention is not limited to this. For example, as shown in FIG. 4, one recording track 33 formed on the disk substrate 32 is a groove, and the other recording track 34 is formed.
The same effect can be obtained by using a so-called land / groove type information recording medium 31 in which is a land. In this case, if one boundary 35 between the recording areas has no address information and the other boundary 36 has address information, the track pitch of the recording tracks 33 and 34 can be reduced. it can.

[0048]

As described above in detail, in the information recording medium according to the present invention, the recording tracks are formed in two rows of spirals, and one of the recording tracks is a main track for recording main data. Therefore, high-speed data reproduction and high-speed search can be easily performed by reproducing only the main track.

Further, according to the information recording apparatus of the present invention, the data to be recorded is separated into main data and auxiliary data for assisting the data in advance, and each separated data is formed into a spiral shape on a disk-shaped recording medium. Since data is separately recorded on each of the two rows of recording tracks, high-speed reproduction and high-speed retrieval of data can be easily performed during reproduction.

Further, according to the information reproducing apparatus of the present invention, the main data recorded on one of the two spirally formed recording tracks of the disk-shaped recording medium and the auxiliary data recorded on the other are recorded. Reading means for reading, storage means for storing data read by the reading means, synthesizing means for reading and synthesizing the main data and auxiliary data stored in the storage means, and outputting only the main data from the storage means Or switching means for switching whether to output synthesized data output from the synthesizing means, it is possible to select between normal reproduction and reproduction for search,
High-speed reproduction and high-speed search of data can be easily performed.

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing a configuration of an information recording medium to which the present invention is applied.

FIG. 2 is an enlarged view of a part of a main surface and a cross section of the information recording medium shown in FIG.

FIG. 3 is a block diagram illustrating a configuration of a recording / reproducing apparatus according to an embodiment to which the present invention is applied.

FIG. 4 is a diagram schematically showing another configuration example of the information recording medium.

[Explanation of symbols]

1 magneto-optical disk, 3,4 recording tracks, 6,7
Groove, 10 recording / reproducing device, 11 signal band division /
Encoding unit, 12 memories, 13 CPU, 15 memories, 16 first decoder, 17 second decoder,
18 synthesis circuit, 19 switching section

Claims (5)

[Claims] 1. An information recording medium in which recording tracks for recording information are spirally formed on a main surface of a disk substrate formed in a disk shape, wherein the recording tracks are formed in two rows of spirals, and An information recording medium, wherein one recording track is a main track for recording main data, and the other recording track is an auxiliary track for recording auxiliary data for assisting the main data. 2. The apparatus according to claim 1, wherein data of a low frequency component of the video signal is recorded on the main track, and data of a high frequency component of the video signal is recorded on the auxiliary track. Information recording medium as described. 3. Separating means for separating data to be recorded into main data and auxiliary data for supporting the data in advance, storing means for storing each data separated by the separating means, and storing each data from the storing means. Recording means for reading and recording on two spiral recording tracks of the disk-shaped recording medium; and recording the main data on one of the recording tracks of the disk-shaped recording medium; An information recording apparatus comprising: a control unit that controls an operation of each of the units so that data is recorded on the other recording track of the disc-shaped recording medium. 4. The separating means separates video signal data as data to be recorded into low-frequency component data of the video signal as the main data and high-frequency component data of the video signal as the auxiliary data. The information recording device according to claim 3, wherein 5. A reading means for reading main data recorded on one of two spiral recording tracks formed on a disk-shaped recording medium and auxiliary data recorded on the other, and reading by said reading means. Storage means for storing the obtained data; synthesizing means for reading and synthesizing the main data and auxiliary data stored in the storage means; and outputting only the main data from the storage means or outputting from the synthesizing means Switching means for switching whether to output the synthesized data to be reproduced.