JPH02189769A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE:To attain high speed access to a zone border by providing a new zone to a border of each zone, applying discrete preformat to a position information pattern and providing a means detecting a rotating phase angle of a recording carrier. CONSTITUTION:A border zone 3 is provided among zones A-C in an information recording carrier disk in which each preformat signal is set so that a rotating speed differs from the zones A-C or the frequency of a reference synchronizing signal differs, and preformat information sets 4, 5 including the position information without fail are provided to the border zone 3 discretely alternately. That is, the preformat information sets 4, 5 of the border zone 3 between the zones B, C are subject to preformat with a modulation signal demodulated by number of revolutions of the zones B, C or with a reference synchronizing signal and a means detecting the rotating phase angle of the information recording carrier disk is provided. Thus, the access to the zone border 3 is attained at a high speed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an information recording and reproducing device, and in particular, to an information recording and reproducing device that speeds up access when recording information on a disk-shaped information recording carrier or reproducing information from the recording carrier. The present invention relates to an information recording and reproducing device that facilitates recording and reproducing information.

[Conventional technology]

Conventionally, known disk-shaped information recording carriers include hard disks and floppy disks that record and reproduce information using magnetism, and optical disks that record and reproduce information using optical energy. In particular, with the development of computer systems, a large number of these record carriers are being used as peripheral memories of personal computers. Optical disks have a relatively new history compared to magnetic disks, so they are currently used less frequently than optical record carriers, but their high capacity characteristics have attracted attention and their development has been remarkable in recent years.

CDs are already commercialized as optical discs.

CD-ROMs and the like are popular, but information cannot be recorded on them by the ED. At present, there are two types of devices that can record information: the DRAW (also called WORM) type, which allows information to be recorded only once in the same location, and the erasable type, which uses magneto-optical materials or phase change materials. There is a so-called device that can record information repeatedly.

Other classifications of optical disks include CAV type, which has a constant rotational speed, and CLV type, which has a constant linear velocity or recording density. CAV type is advantageous for high-speed access, and CLV
The type has a characteristic that the information capacity is 1.5 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 computers (particularly personal computers), but for this purpose both a large amount of information and a high speed of access time are required. No. 59-38970, and recently Nikkei Electronics No. 1988.5/30', P, 83
As introduced in , MCAV (Modified
Con5tant Angular Velosit
y) method is attracting attention as a method that satisfies this requirement.

The MCAV method divides the recording area into multiple zones,
It refers to a recording/reproducing method in which the CA'/ method is adopted within each zone, and the relationship of the CLV method is adopted between zones. There are two known types of CLV system relationships between zones: the first type is a system in which the rotational speed of the record carrier is changed between each zone, and the second type is a system in which the rotation speed of the record carrier is changed between each zone. The frequency of the reference clock is changed between the two, and the number of revolutions is constant.

FIG. 3 shows an example of a conventional MCAV disc format. The information recording area of the record carrier 30 is, for example, A,
It is separated into five zones: B, C, D, and E. The recording zones A, B, C, D, and E are each divided into sectors, and in the illustrated example, the zone has 4 sectors, the zone B has 75 sectors, the zone C has 76 sectors, the zone D has 7 sectors, and the zone E has 78 sectors.

In addition, at the beginning of each sector, as shown in Figure 3, 7 mother turns such as sector mark SM, synchronization pull-in i4ter/VFO, address mark AM, rack number TrNOe sector number 5eNO + collation information mark ID, etc. are preformatted. has been done.

Note that the zones are usually adjacent to each other. For example, when recording from the inside to the outside, the last track of the A zone and the first track of the B zone are adjacent to each other.

[Problem to be solved by the invention]

By the way, in the MCAV system, in the access mode, the head moves in the radial direction of the disk by a seek means. However, when addressing near the boundary area of a zone, if the head moves and touches the next zone,
Since the rotation speed or synchronization signal has already been switched to one corresponding to a certain zone of the target track, it becomes impossible to read the information preformatted at the beginning of the sector.

Therefore, the head position becomes unknown at the rough seek stage, and
A problem arises in that it is no longer possible to enter fine seek mode (a mode in which tracks are addressed in detail), and access takes too much time.

In view of these problems, it is an object of the present invention to provide an information recording and reproducing apparatus that can access zone boundaries at high speed in the MCAV system.

[Means to solve the problem]

In order to achieve the above object, a disc-shaped information recording carrier is used, in which the recording area is divided into zones, and each preformat signal is set so that the rotational speed is different for each zone, or the frequency of the reference synchronization signal is different. In an information recording/reproducing device for recording or reproducing information, a new zone portion is provided at a boundary portion of each zone of the disk-shaped information recording carrier.

discretely glyph formatting the rotational speeds of the two zones adjacent to the zone portion or the main turn of position information that can be demodulated with the reference synchronization signal, and detecting the rotational phase angle of the disk-shaped information recording carrier; An information recording and reproducing apparatus is provided, characterized in that it has a means.

〔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 1 is divided into zones. Each zone (A, B, C in Figure 1(b))
zone) is a plurality of sectors A-1, A-2
,..., B-1, B-2,..., C-1, C-
2.

It is divided into... Although the number of sector divisions differs depending on each zone, the data capacity recorded in each sector is the same. Also, each sector contains, for example, the information shown in FIG. 3, 7'! 77 outputs are divided by the mat 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. FIG.

Seek errors include track fluctuations due to the eccentricity of the record carrier and errors due to the accuracy of the seek mechanism; however, the number N of tracks in the boundary zone section 3 according to this embodiment is equal to the movement error due to the accuracy of the seek mechanism. shall be. For example, about ±50 μm due to eccentricity (track pitch is 1.6 μm)
If there is a variation in the number of tracks and the accuracy of the seek mechanism is ±10 lines, then the number of tracks N should be slightly more than 20 lines.

In the boundary zone portion 3, glyph format information 4.5, which necessarily includes position information (for example, a track number that allows the head position to be determined by reproduction), is discretely and alternately provided.

The preformat information 4 of the boundary zone between B e C zones is preformatted with the rotation speed of the B zone or a modulation signal that can be demodulated with the reference synchronization signal, and the glyph mat information 5 is the rotation speed of the C zone. , or is preformatted with a modulation signal that can be demodulated with the reference synchronization signal. A
The same applies to the boundary zone between the zone and B zone, and the rotation speed or reference synchronization signal of zone A and zone B
Information pre-matted with a modulation signal that can be demodulated with the rotational speed or the reference synchronization signal is discretely and alternately arranged. Information recording is prohibited between each glyph format.

The configuration of each f format information is as shown in Figure 1 (a). For example, the green 7 format information 4 is based on the synchronization signal frequency of the B zone, as shown by the black circle of fn in Figure 1 (,). Preformatted VFO/? Several turns are lined up, after which a modulated position information t4 turn is preformatted.

Similarly, the glyph N-mat information 5 is 'a' in Figure 1(,).
As shown by the +1 black circle, several VFO/G turns serially formatted with the %C zone synchronization signal frequency are lined up, followed by the modulated position information i! The turn is preformatted. Each preformat information should at least include a VFO (synchronization) main turn lead-in signal) and a track number, but it is desirable to add a synchronization signal, a postamble signal, etc. for reliable position information reproduction.

Next, FIG. 2 is a block diagram of the information recording/reproducing apparatus according to this embodiment.

14 is a record carrier, 9 is an optical head, and when recording information, the host computer 60 commands are transmitted to the drive controller 8 via the interface, and the drive controller 8 via the modulation circuit 19; optical head 9
send a recording signal to.

The optical spatula P9 focuses a laser beam or the like onto the recording layer of the record carrier 14, and records information by forming recording pits by making holes in the recording layer, changing the reflectance or transmittance of the recording layer, etc. Make a record.

When reproducing information, the optical head 9 receives reflected light from the record carrier 14, demodulates it via the filter 27 by the demodulation circuit 16, and sends a reproduction signal to the drive controller 8.

25 is an AT and AF control circuit, which when recording and reproducing information,
Auto-tracking and auto-focusing are performed by moving the objective lens actuator 28 using a reproduction signal of the filter 27 so that the light beam is correctly focused on the information track. AT, AF control circuit 25
is turned off by drive controller 8.
is controlled.

Reference numeral 13 denotes a slider integrated with the optical head 9, and the slider 13 moves on the rail 31 during rough seek.

10, the access command is retried by host computer 6! - This is a circuit that stores the number of the target track when the controller 8 is used. Drive controller 8
stores the track number in the storage circuit 10, simultaneously causes the arithmetic circuit 11 to calculate the number of tracks to be sought, etc., and transmits an access command to the seek control circuit 12.

Note that, simultaneously with the access command, the drive controller 8 issues an auto-tracking OFF command to the control circuit 25. Furthermore, the drive controller 8 issues a command to the spindle control unit 18 to change the rotation speed to the rotation speed of a zone in which the target track exists, or sends a synchronization signal to the synchronization signal generator 20 so that demodulation can be performed using the reference clock of the zone in which the target track exists. Issues a frequency switching command. Note that after the rough seek is completed, the AT and AF' control circuits 25 are turned on, the reproduced signal is sent to the demodulation circuit 16 via the filter 27, the demodulation circuit 16 reads out the track number, and the memory circuit lO
The arithmetic circuit 11 compares the track number stored in the track number, and performs a close seek to correct the difference.

In the present invention, a rotational phase angle detection means is provided.

21 is a rotary encoder that shares a rotational axis with the spindle motor 17, and a signal output signal is obtained from the photo-force cables 22 facing each other on both sides of the rotary encoder, thereby determining the rotation angle. In other words, one pattern in the encoder is different from another /?
A pulse pulse signal with a wide width is obtained from the photocoupler 22, and the pulse signal with a wide width is set as 0, and the subsequent thin pulses are counted by the counter 23, thereby controlling the rotation. You can know the angle. 24
is a memory circuit that stores the number of pulses, that is, the rotation angle.

The data is stored based on a storage command issued to the storage circuit 24 at the same time as the access command issued from the drive controller 8 to the seek control circuit 12. 26 is a comparison circuit;
The noggles count number stored by the memory circuit 24,
Compare whether the count number counted by the counter 23 is equal or not.

When they become equal, a signal is sent to the drive controller 8.

Next, the seek operation of the record carrier and information recording/reproducing apparatus of this embodiment having the above configuration will be explained.

First, a case will be described in which access is made to a remote location away from a zone boundary.

Instructions from the host controller (eg, TTF personal computer) 6 are sent to the drive controller 8 via the interface DON7.

For example, suppose that the optical head 9 is currently located on the 100th track of zone A, and the host commands the
Assume that information is to be recorded from the first sector (first sector) of the 50th track.

First, the destination track address is sent as a signal from the drive controller 8 to the arithmetic circuit 11 via the buffer memory 10. This arithmetic circuit 11 calculates the number of tracks or distance to be sought, and sends a signal to the seek driver 12 to move the slider 13. On the other hand, the drive controller 8 issues an instruction to move the optical head 9 and at the same time sends an instruction to the spindle motor driver 18 to rotate the spindle motor 17 to the set rotation speed of the C zone. Alternatively, in order to enable demodulation with the set reference clock, the synchronization signal generator 20 is instructed to switch the synchronization signal frequency, and the reference clock set in the C zone is sent to the signal demodulation system 16 and the modulation system 19. It will be done.

At the same time, a storage command is sent to the storage circuit 24 for the number of medium pulses at the time of access command, and an auto-off of the optical head is sent to the storage circuit 24.
An instruction is given to the auto-tracking control circuit 25 to open the auto-tracking servo.

When the optical head 9 receives a movement instruction, the optical head 9 moves after counting the track crossing signals obtained by the optical head 9 or measuring the distance using an externally attached remote encoder.
Approach the target position. This operation is a coarse seek, and in this mode, it is usually not possible to move the optical head 9 so that the optical switch illuminates the target track itself due to accuracy problems such as overrun of optical head movement. do not have.

The counter 23 outputs the encoder 2 at the end of the coarse seek.
The signal obtained from 1 is counted, and when it becomes the same as the stored count number in the comparison circuit 26, a match signal is sent to the 9 o'clock drive controller 8. The drive controller 8 is
Upon receiving this signal, the control circuit 25 immediately sends the tracking signal to the control circuit 25. Sends an instruction to close.

Then, the AT/AF control circuit 25 drives the objective lens actuator 28, and the light spot is correctly focused on the information track. In the present invention, since the tracking circuit can be closed while making the eccentricity of the record carrier insensitive, it is possible to reach a track near the target track in nine stages of coarse seek. At this stage, zone C 4
Suppose you move to the second track.

The optical head then detects the signal as a change in the reflected light of the optical spot tracing the modulation pattern of the preformatted signal on the record carrier 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 deviation is corrected by minute movement of the objective lens inside the optical head, so that the optical spot is on the target track. (fine seek). In the example described, this is a minute movement of eight tracks.

Then, the sector number of the first sector is read out,
Recording information from the host is modulated by a modulation system 19 and sent as a ratio signal to the optical head, and the information is recorded on the record carrier 14 by, for example, making a semiconductor radar in the optical head flicker with the signal.

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 light spot may reach the boundary zone portion 3 during the rough seek stage due to the accuracy of the seek mechanism or the like. Note that since the present invention is provided with a rotational phase angle detection means, no movement error occurs due to eccentricity.

However, since the boundary zone section 3 is preformatted with position information that can be demodulated using the rotational speed of the C zone or the reference synchronization signal/4' turn, the head position can be detected and immediately obtained from the demodulated signal. It is possible to compare the difference between the position signal stored in the buffer 10 and the next position signal stored in the buffer 10, and it is possible to quickly perform a fine seek and trace the target track of the first grain of the C zone.

In the present invention, since the loop of the tracking circuit is closed at the same rotational phase angle as at the start of the seek, eccentric components are removed and rough seek accuracy can be improved. Normally, with the accuracy of only the seek mechanism, it is possible to keep the deviation from the target track within ±10 lines.

Therefore, even when accessing near the boundaries of each zone, rough seek is performed using only the accuracy of the seek mechanism itself, making it possible to provide a narrow boundary zone on the disk.

Furthermore, since the influence of eccentricity is removed from the rough seek accuracy,
The number of track accesses during fine seek is also reduced, making high-speed seek possible.

In the above embodiment, the grid information of the boundary zone part 3 is arranged alternately, but it may be arranged continuously,
may have been done. For example, in the boundary zone portion 3 between zone B and zone C, several pieces of preformat information 4 may be successively arranged, and then several pieces of f reformat information 5 may be arranged successively.

〔Effect of the invention〕

The information recording and reproducing apparatus according to the present invention provides a new zone section at the boundary between each zone of the disk-shaped information recording carrier, and can demodulate the rotational speed of two zones adjacent to the zone section or the reference synchronization signal. Since the positional information pattern is discretely preformatted and there is a means for detecting the rotational phase angle of the disc-shaped information recording carrier, even when the zone boundary part is accessed, even if the zone boundary part remains in the new zone part. It is possible to obtain position information and thus quick access to the target position. Furthermore,
Since the eccentric component is removed and the tracking circuit is closed, access to row 9 is possible at extremely high speed.

Furthermore, the new zone provided at the zone boundary need only be considered with respect to the accuracy of the seek mechanism itself, so it may be narrow in width, and high-speed seeking is possible without significantly lowering the information capacity i' of the record carrier.

[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. It is a 70-dimensional diagram of a carrier. FIG. 3 is a schematic diagram of the format of a conventional MCAV record carrier. 1.14... Disc-shaped information storage carrier, 3... Boundary zone part, 4, 5... Glyph format information, 17.
... Spindle motor, 21... Rotary encoder, 22... Photo coupler - A, B, C... Zone. Agent Patent Attorney Johei Yamashita (

Claims (1)

[Claims] Information recording for recording or reproducing information on a disk-shaped information recording carrier in which a 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 a reference synchronization signal is different. In the reproducing device, a new zone section is provided at a boundary between the respective zones of the disk-shaped information recording carrier, and a positional information pattern that can be demodulated using the rotational speed of two zones adjacent to the zone section or the reference synchronization signal. 1. An information recording and reproducing apparatus, comprising means for discretely preformatting the disc-shaped information recording carrier and detecting a rotational phase angle of the disc-shaped information recording carrier.