JP2000040304A - Optical disk and optical disk recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the number of revolution of an outer peripheral part the smallest and to shorten the rotation starting time by recording information related to disk control in the outer peripheral part, applying the outer periphery as a disk control information recording area to be first reproduced when disk operation is started and recording the data from the outer periphery toward the inner periphery. SOLUTION: Read-in information of embossed data is recorded on the outer periphery 11 of a disk 1, and disk information is recorded in an embossed read-in area 12. A signal related to address information is extracted from the signals regenerated from a pickup, and is sent to an address circuit, and an address is extracted/analyzed, and whether a present area is a limited area for read-in and read-out or a data recording area is decided based on the analyzed value. The number of revolution of the disk answers to the linear velocity of the outer periphery, and becomes the number of latest revolution in the whole area of the disk. Thus, a load of a spindle motor becomes the lightest when the disk is reproduced, and a rising time to the prescribed number of revolution becomes the fastest.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recordable optical disk apparatus, and more particularly to a small and large-capacity optical disk.

[0002]

2. Description of the Related Art As a conventional large-capacity small-size optical disk capable of recording and exchanging media, a mini disk is a typical example. There are two types of mini-disc: a read-only mini-disc that has already been recorded and a recordable mini-disc. In a read-only mini-disc, uneven pits (emboss pits) are formed on a substrate, and information is determined based on the intensity of laser return light.

On the other hand, a recordable mini-disc uses a magneto-optical disc and detects a rotation angle of a polarization plane of light caused by a difference in magnetization direction on a recording medium.

[0004] The rotation control method of the mini-disc is the CLV method in which the linear velocity is constant for both the read-only and magneto-optical recording discs. Further, since the main purpose is to record and reproduce music, the transfer speed is low, and therefore, the rotation speed of the disk is about 1000 rpm at the maximum. The information also has a lead-in area in which disk information is written at the innermost periphery, data is recorded and reproduced from the inner periphery to the outer periphery, and ends with a lead-out region at the outermost periphery.

[0005]

In recent years, the use of optical discs for recording video information and computer data has been increasing, and therefore, demands for a large capacity and a high transfer rate have been generated.

For video information, even if a compression technique represented by MPEG is used, it is five to one times larger than audio information.
A transfer rate close to 0 times is required. For example, normal NT
10Mb when SC image is compressed by MPEG2 and recorded
A transfer speed of about ps is required.

In order to realize such a high transfer rate,
At the same time as increasing the recording frequency, it is necessary to increase the linear velocity, that is, increase the number of revolutions. In particular, in the case of a small disk having a small diameter, the number of revolutions increases remarkably. In this case, the number of revolutions on the inner circumference becomes highest.

[0008] Minidisks have not been considered for such a demand for a high transfer rate.

That is, in the mini disc system, since recording and reproduction are performed from the inner periphery, information on the inner periphery is reproduced first. For this reason, the rotation condition of the inner circumference is set, and it is necessary first to achieve the highest rotation speed. For this reason, a large torque is required at the time of starting the motor for the first time, which is not preferable in terms of motor control and electric power. Furthermore, because of high rotation,
There is a problem that it takes a long time to reach the set number of revolutions, and it takes a long time to reach the state of actually performing recording and reproduction after the switch is turned on.

Further, existing CD size discs (120
) and a small-diameter (80φ or less) disk, the inner diameter of the used area is as large as about 50 to 60φ in the case of a CD size disk. There is a problem that the data recording capacity becomes small and the data recording capacity is not sufficient.

In addition, when the disk is used up to the inner circumference of an existing CD size disk in order to obtain a data amount with a small diameter disk, a unique format such as a mini disk is used, and the compatibility of the disk is lost. There is a point.

[0012]

In order to solve the above-mentioned problems, the present invention adopts a format in which recording and reproduction are performed from the outer periphery, particularly for small-diameter discs of 3 inches or less.
Further, a lead-in area having disc information on the outer periphery was formed by emboss pits.

In a CLZ or ZCLV system with a constant linear velocity, by performing recording / reproduction from the outer periphery, it is possible to use the spindle at the lowest rotational speed at the start-up after the disk is inserted. In particular, the effect is remarkable in a system using a small-diameter disk of 3 inches or less.

Further, in order to ensure compatibility between the CD-size disc and the small-diameter disc and to obtain the recording capacity of the small-diameter disc, the same lead-in area as the innermost circumference of the CD-size disc is used. The lead-in area is provided at the outer periphery, and disc discrimination is performed in this lead-in area. According to the lead-in information, recording / reproducing is performed in the outer circumference direction for a CD-size disc and in the inner circumference direction for a small-diameter disc.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a top view of a small-diameter optical disc.
The disk 1 has an outer diameter of 2.5 inches. In the outer peripheral portion 11, lead-in information of emboss data is recorded.
The emboss data is about 2000 tracks. The track pitch is 0.8 μm, and the emboss lead-in area 12 is 1.6 mm. In the embossed lead-in area 12, disc information is recorded.

FIG. 2 shows a format configuration. The outer periphery of the disc includes an embossed lead-in area, a recordable lead-in area, a data area, and a recordable lead-out area. In the disk of this embodiment, an address is formed by emboss pits for each sector in each area, and each area is determined based on the address value.

FIG. 3 shows the structure of the lead-in portion on the outer peripheral portion. There is a guard area at the outermost periphery of the lead-in,
Here, a repeated signal is written in a fixed pattern. Next, there is a lead-in information recording area, in which disk information is recorded as emboss data.

In this embodiment, all of the disk information is formed in advance by emboss data. However, even if this data is, for example, a disk recorded at the time of shipment, there is no problem in performance.

FIG. 4 shows a block diagram of a drive device using the optical disk of the present invention.

The drive device according to the present embodiment includes a disk motor, a pickup, a recording / reproducing amplifier, an address reproducing circuit, and a position detecting counter. Only signals related to address information are extracted from the signals reproduced from the pickup and sent to the address reproduction circuit. The address reproduction circuit reproduces and analyzes the address, and based on the value, determines whether the current area is a control area such as lead-in or lead-out,
It is determined whether the area is a data recording area.

In the actual operation, after the disc is inserted, the pickup goes to the outermost periphery of the disc and reads the address information at that position. In particular, when there is no abnormal operation, the area is the lead-in area, and the lead-in information is read.

At this time, the rotation speed of the disk corresponds to the linear velocity on the outer periphery, and is the slowest rotation speed for the entire area of the disk. Therefore, the load on the spindle motor is the lightest for disk playback,
At the same time, it is the fastest to start up to a predetermined rotation speed.

According to this embodiment, in the reproducing state immediately after the disk is inserted, the drive reproduces the lead-in area on the outer peripheral portion. The recording / reproducing operation of the disc is performed according to this information. In this embodiment, the ZCLV system is used, and the linear velocity is controlled to be substantially constant on the disk. Therefore, the rotation speed is the slowest in the outer peripheral portion. For this reason,
This is effective in terms of motor start-up control and power consumption.

Further, when the lead-in disk information is recorded as emboss data, the emboss data has higher signal quality than recording / reproducing data and is more resistant to dirt flaws and the like. Further, the embossed data area is characterized in that it is not recorded, so that it is likely to occur at the outer peripheral portion of the disk, and the influence of substrate distortion is less likely to be affected by the non-uniformity of the protective coating. From these points, as compared with the recording area, the embossed area can be used up to the outer peripheral end of the disk, which has the effect of increasing the disk capacity.

FIG. 6 shows another embodiment of a small-diameter disk which can be used with a large-diameter disk. FIG.
Is an existing first disk used in this embodiment. The first disk has a diameter of 120φ and an inner periphery of 46φ to 48φ is an embossed lead-in area. Recording and reproduction are performed from the inner circumference to the outer circumference. The spiral direction is a counterclockwise direction viewed from the pickup.

FIG. 6 shows that the second disk, which is a small-diameter second disk used in this embodiment, has an outer diameter of 50φ and a diameter of 48φ.
To 46φ is the lead-in and the area below 46φ is the data area. Recording and reproduction are performed from the outer periphery toward the inner periphery. The spiral direction is formed clockwise unlike the first disk.

In the disk of this embodiment shown in FIGS.
Only in the lead-in area, the first disk and the second disk are recorded in exactly the same format. The second disk has a structure in which emboss data is provided on the outer periphery, and data is recorded / reproduced on the inner periphery.

The recording / reproducing apparatus reproduces the embossed lead-in data in the area of 48φ to 50φ on both the first and second disks, and, depending on the content of the data, the outer peripheral direction if the first disk. Recording is started, and in the case of the second disk, recording is started in the inner circumferential direction.

FIG. 7 shows another configuration of the lead-in area of the second disk. In this embodiment, the spiral directions of the lead-in area and the data area are different. That is, in the lead-in area, it is counterclockwise as in the first disk, but in the data area it is clockwise. Therefore, a buffer region is formed between these two regions.

FIG. 8 shows the algorithm. Reproduce the lead-in information and determine the disc.

According to the present embodiment, since the lead-in area has the same structure as the first disk including the spiral direction, when the disk information is first obtained, the evaluation is performed in the first disk mode. Good.

[0032]

The optical disk according to the present invention is a small-diameter disk and has a configuration in which recording and reproduction are performed in a CLV or ZCLV rotation mode. This is a disk structure in which recording and reproduction is started from the outer peripheral portion after the present disk is inserted, and has a lead-in area on the outer peripheral portion for starting recording and reproduction. Therefore, there is an effect that the number of rotations at the outer peripheral portion is the slowest and the rotation start-up time is short.

The outer periphery is a lead-in area, and the same information is repeatedly recorded in the lead-in area to avoid an error. For this reason, there is a feature that it is more resistant to errors than the normal area. In the present invention, since the outer peripheral portion has a lead-in region resistant to this error, the outer peripheral portion, which is easily damaged when handling the disk, can be used reliably, so that an increase in capacity can be expected.

[Brief description of the drawings]

FIG. 1 is a plan view of an optical disc shown in a first embodiment.

FIG. 2 is a diagram showing a format of an optical disc in the first embodiment.

FIG. 3 is a configuration diagram showing a configuration of a lead-in unit.

FIG. 4 is a configuration diagram illustrating a drive device.

FIG. 5 is a plan view of a conventional optical disk.

FIG. 6 is a plan view of an optical disc according to a second embodiment.

FIG. 7 is a configuration diagram showing a configuration of a lead-in unit in a second embodiment.

FIG. 8 is a flowchart showing the operation of the drive.

[Explanation of symbols]

1 ... Disc, 11 ... Outer periphery, 12 ... Emboss lead-in area.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5D044 AB05 BC06 CC06 DE02 DE03 DE34 DE42 DE52 DE78 5D090 AA01 BB04 GG01 GG07 GG21 GG26

Claims (7)

[Claims] In a rewritable optical disk, a CLV (Constant L) having a constant linear velocity on the inner and outer circumferences is provided.
Inner Velocity) method or ZC in which the disk is divided into a plurality of areas (zones), the number of revolutions changes for each zone, and the linear velocity at the inner and outer circumferences keeps a nearly constant value.
In an optical disc having a structure in which recording and reproduction are performed in one of the LV (Zone CLV) systems, information relating to disc control is recorded on an outer peripheral portion, and when a disc operation is started, a disc control information recording area (lead-in area) to be reproduced first. ) Is on the outer circumference, and data is recorded from the outer circumference toward the inner circumference. 2. The optical disc according to claim 1, wherein the outer diameter of the disc is 80 mm or less. 3. The optical disk according to claim 1, wherein the disk control information in the lead-in area on the outer periphery of the disk is formed by uneven pits (embosses). 4. In two types of disks having different outer diameters,
The first disk having a large outer diameter has a data recording start position on the inner periphery and records data from the inner periphery to the outer periphery. In the second disk having a smaller outer diameter, the recording start position is located on the outer periphery. An optical disc for recording from an outer circumference to an inner circumference, wherein both lead-in areas are between the inner circumference of the first disk and the outer circumference of the second disk. 5. The optical disk according to claim 4, wherein the first disk and the second disk have the same lead-in area. 6. The optical disk according to claim 4, wherein the data area of the first disk and the data area of the second disk have opposite spiral directions. 7. At least a function of reading common lead-in information of a first disk and a second disk and discriminating a disc based on disc information, and starting recording on an inner circumference or an outer circumference based on disc discrimination. An optical disk recording / reproducing apparatus characterized by the following.