JPH02199666A - Information recording and reproducing device and recording medium - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a recording medium and a method for recording and/or recording information on the recording medium.
Or it relates to an information recording/reproducing device n for reproduction.

[Prior Art] Optical disks have tracks arranged concentrically or spirally, and each track is divided into a plurality of sectors in order to record variable length data and to speed up access. Optical recording 1j is performed.

Information is recorded by focusing laser light emitted from a semiconductor laser onto the recording layer on the disk and drilling holes in the recording layer.
Alternatively, recording bits may be formed by changing the ratio or transmittance.

The data recording density format is roughly divided into two types: the ci,v method in which the recording bits are recorded on the disk at a constant linear velocity, and the CAV method in which the recording bits are recorded at a constant angular velocity.

In the CAV method, since data is recorded at a constant angular velocity, the data recording density per unit length at the outer circumference of the disk is lower than that at the inner circumference, making it inferior in terms of efficient use of storage capacity. Also, in the C+ and V methods, the sectors are not radial, so
In addition, since the rotational speed differs depending on the five positions, data cannot be read until the disk rotational speed reaches the target value at the time of access, resulting in a long access time.

Therefore, the MCAV system has been proposed in Japanese Patent Application Laid-Open No. 1671374/1983, which has both the easy access of the CAV system and the advantages of the recording density of the CLV system. That is, this method divides the disk in the direction of its rotational radius and records at a lower rotational speed toward the outer periphery, thereby improving the drawback of the CAV method in that the recording density decreases toward the outer periphery.

Additionally, an MCAV method has been proposed as a method that provides similar effects. In this method, the number of revolutions is constant on both the inner and outer circumferences, the recording/reproducing frequency is increased toward the outer circumference, and the recording density is increased toward the outer circumference.

On the other hand, in such an information recording and reproducing apparatus that records and reproduces information in units of sectors, it is necessary to record information in a designated sector and reproduce it from that sector. To this end, there are two types of search mechanisms known in the art: a kick mechanism in which an optical head hogs a light beam to perform track jumping, and a seek mechanism in which an optical head transport mechanism such as a linear motor is used.

Generally, an arbitrary track or sector is accessed by performing a coarse search using a seek, and then performing a fine search using a kick to access the desired track or sector.

If there is a defect on the desired track and the head is blown off due to a tracking error, tracking is performed again to access the desired track.

FIG. 4 shows a general configuration of the format of a disk-shaped recording medium employing the CAV system. In the same figure, 15
is the management area, 16 is the prohibited area, and what are zone l and zone 2! ! It is divided into normal areas 16. When moving the head from zone 1 to zone 2, from the rotation speed corresponding to zone 1 to the rotation speed corresponding to zone 2,
Head is waiting his time.

[Problems to be Solved by the Invention] However, in the above conventional example, when the head moves between zones with different angular velocities or the same recording frequency, or when two recording/reproducing areas are
There is a problem in that when a recording medium spans two or more zones, it is not possible to perform continuous recording or reproducing operations in the same way as in the same zone.

Furthermore, providing adjustment areas for angular velocity or recording/reproducing frequency between each zone as described above is not preferable in terms of effective use of the recording area of the recording medium.

[Means for Solving the Problems] An object of the present invention is to provide an information recording and reproducing device that solves the problems of the prior art described above and can easily perform recording and reproducing operations spanning two or more zones. It is in.

Another object of the present invention is to provide an information recording medium that can effectively utilize the recording area of the recording medium by using the information recording and reproducing apparatus described above.

The above purpose is to divide a recording medium into a plurality of zones each including a plurality of tracks, and to maintain a constant angular velocity or recording + in each zone and different angular velocities or recording + in different zones.
(ii) In an information recording and reproducing apparatus comprising a head for recording and/or reproducing raw frequency information and means for moving the head toward a target destination track, , information characterized in that, when moving to another zone, means is provided for moving the head to the destination zone prior to adjusting the angular velocity or recording/reproducing frequency corresponding to the destination zone. This is achieved by a recording/reproducing device.

In addition, the recording medium is divided into multiple zones each containing multiple tracks, and within each zone, the H
The present invention relates to a recording medium that records or reproduces information at different angular velocities or recording/reproducing frequencies in different zones, the recording medium having no area for changing the angular velocity or recording/reproducing frequency between the zones. objective is achieved.

[Operation] According to the present invention, there is no area on the recording medium for changing the angular velocity or the recording/reproducing frequency when changing the zone, and when changing the zone, the head is moved from the zone before the change to the zone after the change. In this case, completion of the zone change can be confirmed by detecting the sector mark after the predetermined change has been made. In addition, when recording and reproducing between adjacent zones, after the recording operation of the last track in the zone, the next track, the first tract in the next zone, is kicked, and the predetermined change is made. Completion of the zone change is confirmed by detecting the sector mark after it has been done. This action causes
Recording and reproducing operations spanning two or more zones can be performed without providing an area for changing the angular velocity or recording and reproducing frequency between each zone.

[Embodiments] Hereinafter, an information recording/reproducing apparatus and an information r41 recording medium of the present invention will be described in detail based on specific embodiments and with reference to the drawings.

As an embodiment of the information recording i11 generating device of the present invention, an optical disk device using an optical disk medium will be described as an example. Note that in the information recording and reproducing device 8 according to the present invention, the recording and reproducing device refers to a device that has at least one function of reproducing, recording, and erasing processing.

FIG. 3 shows a schematic diagram of an optical disk processing apparatus which is an embodiment of the information recording/reproducing apparatus of the present invention.

In the figure, the main functions of each circuit will be sequentially explained. The main control circuit sends the write data from the 11th device 17 to the modulation circuit 2, and also instructs the drive control circuit 4 about the track address to which to write. Drive control circuit 4
Instructs the optical disc device 5 to move the head (not shown) to the write destination track, and then the optical disc device 5
ID recognition counter 4 in drive control circuit 4 after receiving data information indicating that tracking has started from
! and waits for detection data from sector mark detection circuits 6 and 1 and D detection circuit 7. Sector mark detection circuit 6
detects a sector mark from the reproduced data from the optical disk device 5, and if detected, +1) detection circuit 7. Synchronous circuit 8, drive control circuit 4. The modulation circuit 2 is informed of this fact. After the ID detection circuit 7 and the synchronization circuit 8 detect the sector mark, the drive control circuit 4. Preformatted D data on the optical disk and a synchronization pulse are sent to the demodulation circuit 3.

The demodulation circuit 3 demodulates the data sent from the optical disk device 5 and the ID data sent from the ID detection circuit 7 using the synchronization pulse sent from the synchronization circuit 8.
Each data is sent to the main control circuit l.

After receiving the detection data from the sector mark detection circuit 6, the modulation circuit 2 sends the modulated data to the optical disk device 5. At this time, the modulation circuit 2 may send the data after receiving the input command from the main control circuit 1, or may send the data after a certain period of time after detecting the sector mark.

The main control circuit I receives the demodulated data from the demodulation circuit 3, sends the data to the host device 9, and uses the data to instruct the drive control circuit 4 and the variable circuit 2. do. For example, if it is the target track and the target sector, the modulation circuit 2 is instructed to that effect, and if it is not the target track, the target track address is instructed to the drive control circuit 4.

]D recognition counter 41 in the drive control circuit 4
Reset after receiving detection data.

The operations according to the present invention, which will be described later, are mainly performed by commands from the main control circuit 1, and those that cannot be determined by the main control circuit 1 are determined by the host device 9.

FIG. 1 shows an example of the disc format of an optical disc medium that best represents the characteristics of the information recording medium according to the present invention. In the figure, 30 is a head, A, B, C,
and D are the positions on the optical disk, and e is the seek LQ.
v, ;jl! shows. In the recording medium according to the present invention, prohibited areas between zones as shown in FIG. 6 is not provided, so the recording medium can be used effectively. In this embodiment, the optical disc format is concentric solid.

FIG. 2 shows a flowchart showing the operation of one embodiment of the present invention.

Information recording of the present invention using the optical disk device shown in Fig. 3jj
! An example of the 1i raw method will be described in detail with reference to FIGS. 1 and 2.

When the head is located anywhere in zone l in FIG. 1 and recording or playback is being performed, tracks #11 to #12 of zone 2. #13. An example will be explained in which it is necessary to perform continuous recording or σl generation.

First, seek error e from the arbitrary location in zone 2
Seek to #Z trace (step St in Figure 2). The reason why the head is sought at a distance e by the seek error is to reliably move the head close to the zone boundary 19 and approach the zone boundary 19 safely. Next, in order to kick to track #10 which is the boundary of zone 1, step S2) read the sector mark (step S3) and kick to track #11 of zone 2 (step 4). At the same time as the kick, the angular velocity is changed (step S5), and a count is started by -4 (step S6). In addition, the count shown in Figure 3! D recognition counter 41 is used. The rotation of the same track F is waited until the angular velocity is sufficiently changed, and if a sector mark is detected, the zone changing operation is completed and the desired operation is continued from track #11.

If the rotation waiting time exceeds the predetermined time, the counter overflows (YES in step S8), and after the counter is reset (step S9), the zone 2 is separated by the seek error e. The zone changing operation is completed by detecting the sector mark at #Y hit rack (step 5IO), and the desired operation is continued by kicking to #1II-rack.

[Effect of the Invention J] As described above, the recording medium according to the present invention does not have an area for changing the angular velocity or the recording/reproducing frequency when changing the zone. In the information recording and reproducing apparatus according to the present invention, when changing the zone, when the head is moved from the zone before the change to the zone after the change, the sector mark is detected after the predetermined change is made. When confirming the end of zone change and recording/playing consecutively between adjacent zones, kick the next track, the first track in the next zone, after recording/playing the last track in the zone. However, by confirming the end of the zone change by detecting sector marks after a predetermined change has been made, recording and reproducing operations that span two or more zones can be easily performed on the recording medium according to the present invention. There are effects that can be implemented.

[Brief explanation of the drawing]

FIG. 1 shows a disc format in one embodiment of the present invention. FIG. 2 is a flowchart illustrating the operation of an embodiment according to the present invention. FIG. 3 is a schematic diagram of an optical disk processing apparatus in one embodiment of the present invention. FIG. 4 is an example of a disk format of a conventional recording medium. 1: control circuit, 2: modulation circuit, 3: demodulation circuit. 4: Drive/R drive control circuit, 5: Optical disk device. 6: sector mark detection circuit, 7: ]D detection circuit, 8: synchronization circuit. 9: Upper device. 41: ID recognition counter. Agent Patent Attorney Minoru Yamashita

Claims (4)

[Claims] (1) A head that divides a recording medium into a plurality of zones each including a plurality of tracks, and records and/or reproduces information at an angular velocity or recording/reproducing frequency that is constant within each zone and different from each other in different zones; In an information recording/reproducing apparatus equipped with a means for moving the head toward a destination track, when the head is moved to another zone beyond the zone in which it is currently located, the head is moved to the destination zone. An information recording/reproducing apparatus comprising means for moving the head to the destination zone prior to adjusting the corresponding angular velocity or recording/reproducing frequency. (2) A means for counting time is provided, and when the head is moved from the zone before the change to the zone after the change, the sector mark is detected after the angular velocity or the recording/reproducing frequency is changed; Claim 1, characterized in that if an address cannot be detected within a certain period of time, an arbitrarily specified address within the changed zone is accessed.
The information recording and reproducing device described in Section 1. (3) If a means for counting time is provided and recording/reproduction is performed continuously between the adjacent zones, after recording or reproducing the last track in the zone, the next track in the next zone access on the first track,
2. The information recording and reproducing apparatus according to claim 1, wherein if an address cannot be detected within a certain period of time, an arbitrarily specified address within the changed zone is accessed. (4) A recording medium that is divided into a plurality of zones, each of which has a plurality of tracks, and records or reproduces information at a constant angular velocity or recording/reproducing frequency in each zone and at a different angular velocity or recording/reproducing frequency in different zones, wherein each zone A recording medium characterized in that it does not have an area for changing angular velocity or recording/reproducing frequency between them.