JPH02189742A - Discoid information recording carrier - Google Patents

Abstract

PURPOSE:To attain a high speed access to a zone boundary part by providing a new zone part on the boundary part of each zone and applying pre-format in a discrete way to a position information pattern demodulated with the rotation speed of two zones adjacent to the zone part or a reference synchronous signal. CONSTITUTION:Preformat information sets 4, 5 including position information without fail are provided alternately on a boundary zone part 3 in a discrete way. The preformat information 4 of the boundary zone part between zones B, C is subject to preformat with the speed of revolutions of the zone B or a modulation signal capable of demodulation by the reference synchronous signal and the preformat information 5 of the boundary zone between zones B, C is subjected to preformat with the speed of revolutions of the zone C or a modulation signal demodulated by the reference synchronous signal. This is applied similarly to the boundary zone between the zones A and B and the information subjected to preformat with a modulation signal demodulated with speed of revolutions of the zone A or the reference synchronous signal and the speed of revolutions of the zone B or the reference synchronous signal is arranged alternately in a discrete way. Thus, quick access to an object position is attained.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a disk-shaped information record carrier, and in particular, to a disk-shaped information record carrier that facilitates high-speed access when recording information on the record carrier or reproducing information from the record carrier. This relates to the format of the record carrier.

[Conventional technology].

Conventionally, known disk-shaped information recording carriers include hard disks, floppy disks, which record and reproduce information using magnetism, and original disks, which record and reproduce information using optical energy. In particular, with the development of personal computers, many of these record carriers have been used as peripheral memories for personal computers. Because original disks have a younger history than magnetic disks, they are used less frequently than magnetic recording carriers, but their high capacity characteristics have attracted attention, and their development has been remarkable in recent years.

The original disc is a CD that has already been commercialized.

CD-ROMs and the like are in I-V and RA formats, but information cannot be recorded in these formats. At present, there are DRAW (also called WORM) types that can record information only once in the same location, and erasers that use Hikari air materials or phase change materials. There is a type called a double type that can record information repeatedly.

Other classifications of optical disks include the CAM type, which has a constant rotational speed, and the CLV type, which has a constant linear velocity or recording density. The CAV type is advantageous for high-speed access;
The type has the characteristic that the information capacity is 15 to 2 times larger than the CAV type, and each type has been applied to take advantage of its characteristics.

Optical disks have recently been used as peripheral memory for combination disks, but for this purpose both large information capacity and fast access times are required. In the old days, JP-A-59-38969 and 141iF JP-A-59-38970, and recently Nikkei Electronics 198g, 5.30'3.
As introduced in P. 83, Ic, MCAV (
Modified Con5tant Angular
The V@1osity) method is attracting attention as a method that satisfies this requirement.

The MCAV method divides the distribution area into multiple zones,
The CAv method is adopted within each zone,
This refers to a recording/playback system in which a CLV system relationship is adopted between zones. There are two types of CLV relationships between zones. The first type is
(This is a method in which the rotation speed of the record carrier can be changed between each zone.)
In the second type, the frequency of the reference clock is changed between each zone, and the number of revolutions is constant.

Figure 3 shows the conventional MCAV system.

An example is shown below. The information recording area of the record carrier 30 is divided into five zones, eg, human, B, C, D, and E.

Recording zones A, B, C, D, and E are each divided into sectors.
sector, C zone 6 sectors, D zone 7 sectors,
EC 78 sector.

Further, at the beginning of each sector, as shown in FIG. 3, there is a sector mark 8M, a synchronization pull-in pattern VFO, an address mark AMI) rack number TrNO, and a sector number S@No-verification information mark! /4 turns such as D are glyph formatted and h.

Note that each zone is usually adjacent to each other), for example, when recording from the inside to the outside,
It is adjacent to the first track of the zone.

[Problem to be solved by the invention]

By the way, in the MCAV system, when in the access mode, the head moves in the direction of the inner diameter of the disk relative to the seek means button. However, when addressing near the zone boundary area, if the head moves and the next zone K is addressed,
The rotation speed or synchronization signal has already reached the target 2. Since it has been switched to one that corresponds to a certain zone, the information formatted at the beginning of the sector cannot be read.

Therefore, if the position is unknown at the coarse seek stage,
A problem arises in that it is impossible to enter fine seek mode (a mode in which tracks are addressed in detail), and the access takes time.

In view of the above problems, an object of the present invention is to provide a disk-shaped information recording carrier that allows high-speed access to zone boundaries in the MCA'/method.

[Rounding method to solve the problem]

In order to achieve the above purpose, the recording area is divided into zones, and each green signal is set so that each zone has a different rotational speed or a different frequency of the reference synchronization signal. In the disk-shaped information recording carrier, a new circular zone section is provided at the boundary between the zones, and position information and lean information that can be demodulated using the rotational speed or the reference synchronization signal of two zones adjacent to the zone section are provided. A disk-shaped information recording carrier is provided, which is characterized in that the information recording medium is discretely preformatted.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 and 2.

FIG. 1(b) is a diagram schematically showing a part of the disc-shaped information recording carrier according to this embodiment.

The recording area of the disk-shaped record carrier l is divided into zones. Each zone (A, B, C in Figure 1(b))
zone) is a plurality of sectors A-1, A-2
,...tB-113-1..., C-1ec-2+.
...It is divided into K. Although the number of sector divisions differs depending on each zone, the data capacity recorded in each sector is the same. Also, each sector includes the information shown in Figure 3, for example! It is divided by a reformat signal section 2.

A boundary zone portion 3 is provided between each zone.

FIG. 1(,) is a partially enlarged view of the boundary zone portion 3. As shown in FIG.

The number N of tracks in the boundary zone part 3 is determined by the number of tracks due to eccentricity,
It is desirable that the amount of variation and seek accuracy be commensurate with each other. For example, the eccentricity is approximately ±50 μm () rack pi.

1.6 μm), and the seek accuracy is ±1.
In the case of 0, it is preferable that the number N of tigers is approximately 84.

The boundary zone portion 3 is provided with discrete and alternating pieces of grid information 4 and 5, which always include position information (for example, a track number by which the positions of ``F'' and ``C'' can be determined by reproduction). Glyphoma of the boundary zone between B and C zones,
The matte information 4 is preformatted with a modulation signal that can be demodulated with the rotation speed of the B zone or the reference synchronization signal, and the pre-7#-mat information 5 is a modulation signal that can be demodulated with the rotation speed of the C zone or the reference synchronization signal. Pre-7 Ohma, it's been done.

The same applies to the boundary zone between Zone A and B, where the glyph omat is generated using a modulation signal that can be demodulated with the zone person's rotation speed or reference synchronization signal and the zone B rotation speed or reference synchronization signal. Information is arranged discretely and alternately. Information records are threaded between each preformer.

The structure of each preformat information is as shown in Figure 1 (1). For example, the preformat information 4 is as shown in Figure 1 (1).
As shown by the black circles in fl in a), several VFO patterns glyph-formatted with the synchronization signal frequency of the B zone are lined up), followed by fi! Ill location information Noreen is located in G7 Oma.

Similarly, Gli 7 oma and G information 5 are Zn+ in Fig. 1 (1).
As shown by the black circle in 1, at the synchronization signal frequency of the C zone,
Several re-formatted VFOA turns are lined up, followed by modulation and glyph formatting of nine position information nodes. Each G7 Oma, To information is the lowest, V
It is sufficient to have FO (synchronous t4 turn pull-in signal) and track number, but it is desirable to add K, synchronization signal, post-angle signal, etc. for reliable position information reproduction.

FIG. 2 shows an example of an information recording/reproducing device.

The seek operation on the record carrier according to this embodiment will be explained using the diagram shown in FIG.

First, a case will be described in which access is made to a place far from a zone boundary.

Host controller (N, t) Gunnarcomputer,
- Instructions from the controller 6 are sent via the interface circuit 7,
It is sent to the P-y Eve controller 8.

For example, the 100th tiger in Zone A, Rini Hikari,
9 is located, and instructions from the host indicate zone C.
Assume that information is to be recorded from the first sector (first sector) of 50 lines.

First of all, the address of the destination is Pa, 7 am memory 10 di and dry! -28 is sent as a signal to the arithmetic circuit 11. This arithmetic circuit 11 calculates the number or distance to be sought, and sends a signal to the seek driver 12 to move the seek moving member (slider 13 integrated with the optical head 9 in the case of a linear motor mechanism). .

On the other hand, dry!・The controller 8 issues an instruction to move the door 9 to the light, and at the same time turns the spindle motor 17 to C.
An instruction is sent to the spindle motor driver 18 to rotate it to the rotation speed set in the zone. Alternatively, the synchronization signal generator 2 can be set so that demodulation is possible with nine reference clocks.
An instruction to switch the synchronizing signal frequency is issued to the signal demodulation system 16 and the variable V4 system 19.

When the optical head 9 receives an instruction to move, the optical head 9 moves while measuring the distance using an externally attached linear encoder or an external linear encoder that designs the cross-traffic signal.
Approaching the target position, this operation is a coarse seek; in this mode, the light spot is usually illuminated on the target track itself due to accuracy problems such as eccentricity of the record carrier 14 or overrun of the optical head movement. (To the light, it is not possible to move Do3.0 For example, it has only been moved to the 35th track of zone C.

The source head then detects a signal as a change in the reflected light of the source spot tracing the glyphoma of the record carrier, the modulation/four turns of the signal, and sends the signal to the demodulation system 16. The difference between the position signal obtained from this demodulated signal and the position signal stored in the buffer 10 is compared, and the difference is corrected by a minute movement of the seek slider 13 or a minute movement of the objective lens inside the door. Use Kikumasa to make the light spot trace the target track (7 eyes/seek). In the example described, this is a minute movement of 15 tracks.

Then, the first sector's Sector Chin/E is read out, and the recorded information from the host is changed and sent to the optical fiber as a signal modulated by the Pi19. For example, the semiconductor radar in the optical head is Recording carrier 1 by blinking information
Record in 4.

Next, we will discuss the case of accessing near the boundary of the zone. As an example, assume that the target track is the first track in the C zone.

In this case, the optical slit I may reach the boundary zone portion 3 during the rough seek stage due to eccentricity or the like.

However, since the boundary zone section 3 is preformed with a pattern that includes position information that can be demodulated with the rotation speed of the C zone or the reference synchronization signal, the head position can be detected and immediately obtained from the demodulated signal. position signal and buffer I
It is possible to compare the difference with the position signal stored as OK, and it is possible to immediately perform a 6D and 7 ain seek and trace the target track and climb of the first grain of the C zone.

In addition, in the above embodiment, Guri 7 ohm of the boundary zone part 3,
Although it is assumed that the point information is arranged alternately, it may be arranged continuously. For example, in the boundary zone 3 between zone B and zone C, several pieces of glyph format information 4 may be successively arranged, and then several pieces of preformat information 5 may be arranged successively. .

〔Effect of the invention〕

In the record carrier according to the present invention, a new zone section is provided at the boundary between each zone, and position information/quantity turf that can be demodulated using the rotational speed or reference synchronization signal of two zones adjacent to the zone section is provided in a discrete manner. Since the new zone is formatted, it is possible to obtain position information even if the user stays in the new zone when accessing the zone boundary, and therefore, it is possible to quickly access the target position. .

[Brief explanation of the drawing]

FIG. 1 is a diagram illustrating a record carrier according to an embodiment of the present invention, in which FIG. 1(a) is an enlarged view of the boundary zone portion in FIG. 1(b), and FIG. FIG. 2 is a schematic diagram of a portion of the format. FIG. 2 is an example of a block diagram of an information distribution and reproduction device. FIG. 3 is a schematic diagram of the format of a conventional MCAV record carrier. l, 14... Disc-shaped information recording carrier, 3... Boundary zone portion, 4, 5... Pre-7 ohm information, A. B, C...Zone

Claims (1)

[Claims] In a disk-shaped information recording carrier in which the recording area is divided into zones and each preformat signal is set so that the rotation speed is different for each zone or the frequency of the reference synchronization signal is different, at the boundary of each zone. A disk-shaped information recording device, characterized in that a new zone is provided, and a positional information pattern that can be demodulated with the rotation speed or the reference synchronization signal of two zones adjacent to the zone is discretely preformatted. carrier.