JPH09204723A - Optical disk recording/reproducing method, device therefor and optical disk medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform continuous processing even over a boundary by providing a transition region in a zone boundary and setting a disk rotational number for recording/reproducing to an optional rotational number between the disk rotational number of the zone and the disk rotational number of the disk in a zone outside by one in the transition region. SOLUTION: When extending over a boundary between the zone K of an inner peripheral side and the zone (K+1) of an outer peripheral side, first the entering of a transfer region from the normal region of the zone K of the inner peripheral side is discriminated by a zone discrimination device 9 based on an address decoding signal from an address decoding device 3. Then, based on the discriminated result, a motor rotational number setting signal is sent to a motor controller 5 by a motor rotational number controller 10 so as to realize a disk rotational number coincident with a rotational number characteristic obtained by linearly connecting fixed rotational numbers respectively set for the zone K of the inner peripheral side and the zone (K+1) of the outer peripheral side and the rotational number of a disk motor 4 is controlled. Thus, even in the transfer condition of the changing of the motor rotational number in the zone boundary, data is continuously recorded/reproduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc recording / reproducing method, a disc recording / reproducing apparatus, and an optical disc medium for recording / reproducing information on / from an optical disc whose recording area is divided into a plurality of zones by circumferential boundaries. is there.

[0002]

2. Description of the Related Art In recent years, various sector arrangement methods have been proposed for optical disks. One of them is the ZCLV method. FIG. 7 shows ZCLV (Zoned Constant).
This is a format disk of the Linear Velocity: constant linear velocity in the area) system. In the ZCLV method, the optical disk is divided into a plurality of areas in the radial direction (hereinafter referred to as zones).
Each zone has its own number of sectors, and the number of sectors included in the track for each zone is different. The optical disk shown in FIG. 7 is an example thereof, and the number of sectors per track increases by 1 each time the optical disk moves from the inner zone to the outer zone. In the figure,
A continuous zone from the inner side, for example, zone (k-1),
When the zone k and the zone (k + 1) are set, the number of sectors is 3, 4, and 5, respectively. The sector address areas including the address information of each sector are arranged in a straight line in the radial direction in each zone. In the case of this method, the number of revolutions of the disc must be changed before and after the zone boundary in order to have a constant number of revolutions, which is different for each zone. Recording or playback must be interrupted until.

FIG. 8 is a block diagram showing an optical disk recording / reproducing apparatus disclosed in Japanese Patent Laid-Open No. 7-93873. In the figure, 1 is an optical disc, 2 is an information recording / reproducing head capable of recording or reproducing data on the optical disc 1 and moving to each zone of the disc, 3 is synchronized with the information gate reproducing signal from the information recording / reproducing head 2. An address decoding means for reading an address signal and outputting an address decoding signal obtained by converting the address signal into an address value, 4 is a disk motor for rotating the disk, 5 is a rotation speed of the disk motor 4 for rotating the optical disk 1, and the rotation is performed. The motor control means 6 outputs a motor rotation speed signal for determining whether the number of rotations is constant, 6 outputs recording data to the information recording / reproducing head 2 by a recording gate signal at the time of recording, and a reproduction gate signal at the time of reproducing. The recording / reproducing means for reading a reproduced signal from the information recording / reproducing head 2 by means of 7, and the position 7 of the track being accessed is maintained. In order to achieve this, a still jump generating means for still jumping the information recording / reproducing head 2 by a jump signal, 8 is based on the address decoding signal input from the address decoding means 3 and the motor rotation speed signal input from the motor control means 5. , A gate control signal, a recording gate signal, a reproduction gate signal, a jump signal, and a signal for setting the number of rotations of the disk motor from the address decoding signal.

With the above configuration, the timing control means 8 is provided immediately after the recording / reproducing head passes the zone boundary.
By stopping the output of the recording / reproducing gate signal from the recording / reproducing means 6 to the recording / reproducing means 6, no recording or reproduction is performed, and the address gate signal output to the address decoding means 3 is always read. Further, a motor rotation speed setting signal is output to the motor control means 5, and the disk motor 4 is controlled via the motor control means 5 so as to reach the set rotation speed of the zone after passing through the zone boundary. At this time, the timing control means 8 outputs the jump signal until the motor rotation speed signal representing the motor rotation speed from the motor control means 5 reaches the set rotation speed, and the still jump generation means 7 causes the information recording / reproducing head. 2 is still jumped at the last sector address of the track to hold the track position. Next, when the motor rotation speed signal output from the motor control means 5 is determined to be a constant rotation and the address decoding signal is read from the address decoding means 3,
The timing control means 8 outputs an address gate signal, and the still jump generating means 7 causes a still jump in the final sector of the track of the zone before passing the zone boundary. Then, a recording gate signal or a reproduction gate signal is output from the head sector of the zone after passing the zone boundary to the recording / reproducing means 6 to return to the recording state or the reproducing state, and even if the zone is moved, the head sector of the head track It is possible to record or play back from.

FIG. 9 is a diagram showing an example of disc rotation speed setting in a conventional optical disc recording / reproducing apparatus using ZCLV. As shown in the figure, it is necessary to change the disk rotation speed stepwise at the boundary between zone k and zone (k + 1). However, when recording or reproducing is continuously performed from the zone k to the zone (k + 1), the disk rotation speed is instantly changed from the fixed rotation speed determined for the zone k to the zone (k + 1) at the boundary between the zones. It is difficult to change the rotation speed to the fixed rotation speed determined for the rotation speed, and it takes a certain amount of time to change the rotation speed due to the transient response characteristics of the disk motor.

[0006]

Since the conventional optical disk recording / reproducing apparatus is configured as described above, it is necessary to switch the disk rotation speed in steps when recording or reproducing across zones. Therefore, a waiting time is required until the disk rotation speed reaches a fixed rotation speed determined for the next zone. Particularly, when a video signal or the like is continuously recorded and reproduced in real time, 1) recording and reproduction are interrupted during a waiting time. 2) If a buffer memory is used to avoid interruption of recording / reproduction, the cost will increase due to the use of the memory. There was a problem. In addition, in order to avoid the above problem, the ZCLV method, that is, the recording area is divided into a plurality of zones by a circumferential boundary line, the number of rotations is made constant in each zone, and the number of rotations is fixed for each zone. CAV for recording / reproducing with a constant number of rotations on all recording / reproducing surfaces of the disc without adopting a recording format.
It may be possible to use a (constant angular velocity) format, but in this case, there is a problem that the recording capacity is significantly reduced to about 1/2 to 2/3.

The present invention has been made to solve the above problems, and the recording area is divided into a plurality of zones by a circumferential boundary, and the rotation speed is constant in each zone. When recording or reproducing a ZCLV type optical disc that is recorded at different rotational speeds in zones, it is not necessary to wait for recording or reproducing during the disc rotation speed switching setting when recording or reproducing across zone boundaries. , Continuous recording or playback,
An object of the present invention is to provide an optical disc recording / reproducing method and apparatus capable of continuously recording or reproducing information such as a video signal, which requires time continuity, in real time.

Another object of the present invention is to provide an optical disk recording / reproducing method and an apparatus therefor, which does not require a buffer memory for storing information generated while the disk rotation speed switching setting is on standby.

Furthermore, during the disc rotation speed switching setting for reproduction across zone boundaries, continuous recording or reproduction is possible without the need to wait for recording or reproduction, and in particular the time of the video signal or the like. It enables continuous recording or playback of information that requires continuity in real time, and also eliminates the need for a buffer memory to store information that occurs while waiting for the disk rotation speed switching setting. The purpose is to obtain an optical disk medium.

[0010]

According to a first aspect of the present invention, there is provided an optical disc recording / reproducing method, wherein an optical disc having a recording area divided into a plurality of zones by a circumferential boundary determines a disc rotation speed for each zone. In the optical disc recording / reproducing method in which the linear recording densities in all the zones are set to be approximately constant by performing the fixed number of rotations, one or more tracks on the outer peripheral side in each zone are set as transition regions, The disk rotation speed when recording or reproducing in the transition area is set between the constant rotation speed defined for the zone and the constant rotation speed defined for the zone on the one outer peripheral side of the zone. It is characterized by recording and reproducing.

Further, in the optical disc recording / reproducing method according to the second aspect, the disc rotational speed at the time of recording or reproducing in the transition area is continuously changed so as to be faster on the inner peripheral side and slower on the outer peripheral side. It was done like this.

Further, in the optical disc recording / reproducing method according to the third aspect, when the optical disc further has a spiral information track which advances from the inner circumference to the outer circumference, when recording or reproducing continuously, Except for the transition region of each zone, the optical disc is rotated at a constant rotation speed determined for each zone, and after entering the transition region of the zone, the disc rotation speed is gradually decreased to enter the next zone. Previously, the disk rotation speed was controlled to be a constant rotation speed determined for the next zone.

Further, in the optical disc recording / reproducing method according to the fourth aspect, when the optical disc further has a spiral information track which advances from the outer circumference to the inner circumference, when recording or reproducing continuously, Except for the transition area of each zone, the optical disk is rotated at a constant rotation speed determined for each zone, and after entering the transition area of the next zone, the disk rotation speed is gradually increased to the next zone. The disk rotation speed is controlled so as to reach the constant rotation speed of the next zone before passing through the transition region of.

Furthermore, in the optical disk recording / reproducing apparatus according to a fifth aspect of the invention, in an optical disk in which the recording area is divided into a plurality of zones by a circumferential boundary, the disk rotation speed is fixed for each zone. In the optical disk recording / reproducing apparatus that records and reproduces by setting the number of rotations to keep the linear recording density in all zones substantially constant, recording or reproducing is performed in a transition area composed of one or more tracks on the outer peripheral side in each zone. A means for setting the disc rotation speed during reproduction between a constant rotation speed determined for the zone and a constant rotation speed determined for the zone on the outer peripheral side of the one zone. And

Further, the optical disk recording / reproducing apparatus according to a sixth aspect of the present invention continuously changes the disk rotational speed when recording or reproducing in the transition area so that the inner peripheral side becomes faster and the outer peripheral side becomes slower. It was done like this.

Further, in the optical disk recording / reproducing apparatus according to the seventh aspect, when the optical disk has a spiral information track which advances from the inner circumference to the outer circumference, the continuous recording or reproduction is performed. Except for the transition area of each zone, the optical disk is rotated at a constant rotation speed determined for each zone, and after entering the transition area of the zone, the disk rotation speed is gradually reduced, before entering the next zone. In addition, the disk rotation speed is controlled to be a constant rotation speed determined for the next zone.

Further, in the optical disk recording / reproducing apparatus according to the present invention, when the optical disk has a spiral information track which advances from the outer circumference to the inner circumference, the continuous recording or the reproduction is performed. Except for the transition area of each zone, the optical disk is rotated at a constant rotation speed determined for each zone, and after entering the transition area of the next zone, the disk rotation speed is gradually increased to The disk rotation speed is controlled to reach the constant rotation speed of the next zone before passing through the transition area.

Furthermore, an optical disk medium according to a ninth aspect of the present invention comprises one or more tracks on the outer peripheral side in each zone, and the disk rotation speed is a fixed rotation speed determined for the zone and the zone. It is characterized in that it has a transition area in which recording or reproduction is performed so as to be within a fixed number of rotations defined for one of the outer peripheral side zones.

Further, in the optical disc medium according to a tenth aspect, further, the transition area is recorded or reproduced such that the disc rotation speed continuously changes so that the disc rotation speed becomes faster toward the inner circumference side and slower toward the outer circumference side. It is something.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings. Embodiment 1. 1 is a diagram showing an optical disk recording / reproducing apparatus according to a first embodiment of the present invention. In FIG.
1 is an optical disc, 2 is an information recording / reproducing head capable of recording / reproducing data on / from the optical disc 1, and moving to each zone of the disc, 3 is a sector address signal from the information recording / reproducing head 2 in synchronization with an address gate signal. Address decoding means for reading and outputting an address decoding signal obtained by converting a sector address signal into a sector address value, 4 is a disk motor for rotating a disk, and 5 is an optical disk 1.
Motor control means for controlling the number of rotations of the disk motor 4 for rotating the disk motor 6 outputs recording data to the information recording / reproducing head 2 by a recording gate signal during recording, and from the information recording / reproducing head 2 by a reproducing gate signal during reproduction. Recording / reproducing means for reading the reproduction signal, 8 is an address gate signal based on the address decoding signal generated from the address decoding means 3,
Timing control means for outputting a recording gate signal and a reproduction gate signal, and 9 is a zone discrimination for discriminating a normal area and a transition area (details will be described later) of each zone based on the address decoding signal generated from the address decoding means 3. Means, 10
Is a motor rotation speed control means for outputting a motor rotation speed setting signal to the motor control means 5 based on the discrimination signal from the zone discrimination means 9 and the motor rotation speed signal representing the rotation speed of the disk motor 4 from the motor control means 5. Is.

FIG. 5 is a diagram showing the structure of the optical disk medium used in the present invention. The recording area of the optical disc medium is divided into a plurality of zones by a circumferential boundary,
A transition region including one or more tracks is provided on the outer peripheral side of each zone on the medium. In addition, here, the area other than the transition area in each zone is referred to as a normal area. Further, it is assumed that the optical disc medium is formed with spiral information tracks extending from the inner circumference to the outer circumference. When switching the recording or playback zone, change the disk rotation speed from the fixed rotation speed set for the scanning zone before switching to the fixed rotation speed set for the next zone to be scanned after switching. Will be switched. Therefore, in consideration of the transient response due to the switching of the rotation speed of the disk motor, the width of the transition area in the disk radial direction is sufficient for the rotation of the disk motor to be in a steady state during the scanning of the transition area. Provide a space. Since this optical disk medium uses the physical layout of the sectors of the conventional ZCLV disk as it is, a conventional ZCLV disk can be applied.

Next, the operation will be described with reference to the drawings.
First, as in the conventional example, at the time of recording or reproducing, the address decoding means 3 reads the sector address signal from the sector address area of the optical disc 1 in synchronization with the address gate signal from the timing control means 8 and outputs the sector address signal as the sector address. The address decoding signal converted into the value is output to the timing control means 8 and the zone discrimination means 9. Then, the recording / reproducing means 6 uses the recording gate signal from the timing control means 8 during recording to record data (recording information).
Is output to the information recording / reproducing head 2, and during reproduction, reproduction data (reproduction information) is read from the information recording / reproducing head 2 by a reproduction gate signal. On the other hand, the zone discriminating means 9 determines whether the information recording / reproducing head 2 is scanning a transitional region (regulated) defined on the disk or a normal region on the disk. Determine based on the signal. When the determination result is in the normal region, the motor rotation speed control means 10 sends to the motor control means 5 a motor rotation speed setting signal for keeping the disk rotation speed at a constant rotation speed determined for the zone. The motor control means 5 controls the disk motor 4 so that the number of revolutions is in accordance with the motor revolution number setting signal.

Next, during the recording or reproducing operation, when the transition area is entered from the normal area, the zone discrimination means 9 indicates that the information recording / reproducing head 2 is scanning the transition area based on the address decoding signal. The motor rotation speed control means 10 having received the result of the judgment, the motor rotation speed setting signal is sent to the motor control means 5 so as to approach the disk rotation speed determined for the next zone (strictly speaking, the normal area). To set. In this way, the disk rotation speed when recording or reproducing in the transition area is set between the constant rotation speed defined for that zone and the constant rotation speed defined for the next zone. Here, an example of a method of setting the disk rotation speed in the transition area is shown in FIG. In this example, the disk rotation speed in the transition area is linearly (linearly) changed such that the disk rotation speed becomes faster on the inner circumference side and slower on the outer circumference side. For example, as shown in the figure, when crossing the boundary from the inner peripheral zone k to the outer peripheral zone (k + 1), it is determined by the zone discrimination means 9 that the normal area of the inner peripheral zone k first enters the transition area. The determination is made based on the address decoding signal from the address decoding means 3. After that, according to the determination result, the motor rotation speed control means 10 determines that the inner peripheral zone k and the outer peripheral zone (k + 1).
The motor rotation speed setting signal is set so that the disk rotation speed is in accordance with the rotation speed characteristics obtained by linearly (linearly functioning) connecting the fixed rotation speeds defined for each (strictly each normal area). It is sent to the control means 5 to control the rotation speed of the disk motor 4.

By adopting such a method, it becomes possible to continuously record and reproduce data without waiting in the still state even in a transient state in which the rotation speed of the disk motor is switched at the zone boundary. Further, it becomes possible to delete the buffer memory, which was conventionally required for continuously recording and reproducing data in such a transient state. Further, conventionally, such a transient state is shorter in time, the continuity of reading and writing of data is improved, and a small buffer memory is required. For this reason, the transient response characteristic (step response characteristic) with respect to rotation speed switching is excellent and high performance. Disc motor was required. On the other hand, in the present embodiment, since data can be recorded and reproduced even in such a transient state, it is possible to use a relatively inexpensive disk motor having insufficient transient response characteristics.

FIG. 6 is a diagram showing the recording length of data recorded in a sector of the optical disk medium according to the present invention. Here, an example will be described in which a spiral information track that advances from the inner circumference to the outer circumference (corresponding to the upward direction from the bottom in the figure) is provided. In this case, the disk motor is controlled so as to approach the (regular) number of revolutions defined for the zone (k + 1) from the time of entering the transition region from the normal region of the zone k in the figure. That is, the number of rotations is reduced. As a result, the data recording length of the same information amount gradually becomes shorter than the sector length. Then, the number of rotations of the disk motor reaches the specified number of rotations in the zone (k + 1) before the zone boundary is crossed, and the data recording length also becomes equal to the zone (k
+1) sector length. In this case, there is an area in which no data is recorded in the transition area, but the amount of data recorded in one sector is the same as in the conventional method and only the recording density is slightly higher. Therefore, the recording capacity of the disk is larger than that in the conventional method. Will never decrease.

Embodiment 2 FIG. The optical disk recording / reproducing apparatus according to the second embodiment will be described below. In the optical disc recording / reproducing apparatus shown in FIG. 1, when the normal area enters the transition area during the recording or reproducing operation, as described in the first embodiment, the motor is moved so as to approach the specified rotation speed of the normal area of the next zone. The motor speed is set in the control means 5. Here, in the present embodiment, as shown in FIG. 3, the motor rotation speed is set to an intermediate value of the specified rotation speed with respect to the front and rear zones (strictly speaking, the normal region thereof). The operation for crossing the boundary from the inner zone k to the outer zone (k + 1) will be described with reference to FIG. First, the zone discrimination means 9 discriminates from the normal area of the zone k on the inner peripheral side into the transition area based on the address decoding signal from the address decoding means 3. After that, the motor rotation speed control means 8 controls the inner zone k and the outer zone (k
A motor rotation speed signal is sent to the motor control means 5 so that the value becomes an intermediate value of the specified rotation speed in the normal region of +1). afterwards,
When the end of the transition area is judged by the zone judgment means 9 based on the address decoding signal from the address decoding means 3, the motor rotation speed is set to the prescribed motor rotation speed for the normal area of the zone (k + 1). A setting signal is sent to the motor control means 5.

Embodiment 3 The optical disk recording / reproducing apparatus according to the third embodiment will be described below. In the optical disk recording / reproducing apparatus shown in FIG. 1, when the normal area enters the transition area during the recording or reproducing operation, the motor control is performed so as to approach the specified rotation speed of the normal area of the next zone, as described in the first embodiment. The motor speed is set in the means 5. Here, in the present embodiment, as shown in FIG. 4, the motor rotation speed is set so as to be stepwise between the predetermined rotation speeds for the front and rear zones (strictly speaking, the normal region thereof). From the inner zone k to the outer zone (k +
The operation when crossing the boundary 1) will be described with reference to FIG. First, the zone discrimination means 9 discriminates from the normal area of the zone k on the inner peripheral side into the transition area based on the address decoding signal from the address decoding means 3. After that, the scanning position of the information recording / reproducing head 2 in the transition area is specified by the address decoding signal, and the zone k on the inner circumferential side is specified.
When shifting from the prescribed number of revolutions to the prescribed number of revolutions of the zone (k + 1) on the outer peripheral side, the motor revolution number setting signal is sent to the motor control means 5 so that the number of revolutions decreases stepwise as shown in FIG. Send to.

In the first to third embodiments, if the rotation speed of the disk motor is between the specified rotation speed of the zone concerned and the specified rotation speed of the next zone, the shape exactly shown in FIGS. Does not have to match.

Embodiment 4 In the above description, the case of having a spiral information track that travels from the inner circumference to the outer circumference has been described as an example, but conversely, if you have a spiral information track that travels from the outer circumference to the inner circumference, a transition occurs. The area may be provided immediately after the zone boundary. That is, the arrangement of the normal area and the transition area on the optical disk medium is as shown in FIG. 5, as in the case of having the spiral information track extending from the inner circumference to the outer circumference. For example, zone (k +
If recording or reproduction is performed from the zone 1) to the zone k, in the normal area of the zone (k + 1), the zone (k
The rotation speed of the disk motor 4 is controlled so that the specified disk rotation speed for +1). And zone k
When the zone discriminating means 9 discriminates that the zone k has entered the transition area, the disc rotational speed gradually increases, and the zone k is detected before the transition area of the zone k ends (passes the transition area of the zone k). The disk motor 4 is controlled so that the rotation speed becomes a specified value. Here, the transition area is provided on the outer peripheral side of each zone, as in the case of having the spiral information track traveling from the inner periphery to the outer periphery, for the following reason. If the transition area is provided at the innermost circumference of the zone, the following inconveniences occur. That is, when a zone boundary appears during recording or reproduction, the disc rotation speed increases. On the other hand, the sector length becomes longer in the inner zone as shown in FIG. For this reason, if the transition area is provided at the innermost circumference of the zone, if the transition area from the normal area enters during recording or reproduction, the disk rotation speed will increase, but since the zone is the same, the sector length remains almost unchanged.
The data will not fit in the sector.
For this reason, the transition region needs to be arranged at the outermost periphery of the zone even when the spiral is provided from the outer periphery to the inner periphery.

Further, in this case, it is not necessary to clearly define the boundary of the transition region other than the zone boundary. This is because, if the transition area is recognized as the boundary of the recording or reproducing zone, it may be changed to the rotation speed defined in the next inner circumferential side zone. In this case, the transition area is defined as a track area in which information is not packed in sectors at a density corresponding to the number of revolutions in the zone.

In each of the embodiments, a dummy track or a dummy sector may be provided at the zone boundary portion in order to avoid the deterioration of the data recording / reproducing characteristics due to the crosstalk from the prepit indicating the sector address. In this case, when a dummy track or a dummy sector is encountered during continuous recording or reproduction, a track jump jumps over a dummy area formed by the dummy track or dummy sector. Since the time required for such a track jump is usually as short as one sector passing time or less, it does not affect the continuity of recording or reproduction.

Further, CA not adopting the zone format
It is possible to record using a conventional ZCLV disc which has a capacity about 1.5 to 2 times that of a V disc. The recording capacity is the same as that of the conventional ZCLV disc.

[0033]

Since the present invention is constructed as described above, it has the following effects.

In the optical disk recording / reproducing method and the optical disk recording / reproducing apparatus according to the present invention, one or more tracks on the outer peripheral side in each zone are defined as a transition area, and the number of disk revolutions at the time of recording or reproducing in the transition area is set. Since recording and reproducing are performed by setting between the fixed rotation speed set for the zone and the fixed rotation speed set for the zone on the one outer peripheral side of the zone, it is not necessary to wait for the still operation. It becomes possible to continuously record and reproduce the boundary portion of the zone, and in particular, it is possible to continuously record or reproduce the information such as the video signal and the audio signal, which is essential for continuity, in the real time even at the boundary portion of the zone.

Further, it is possible to eliminate the need for the buffer memory which is required to store the data corresponding to the switching time of the disk rotation speed in the related art.

Furthermore, it is not necessary to instantaneously change the disk rotation speed at the zone boundary, and recording or reproduction can be performed with the characteristics in a transient state accompanying the switching of the disk motor rotation speed, and the step response characteristics are not always excellent. It became possible to use a disk motor that is not available.

In the optical disc medium according to the present invention,
It consists of one or more tracks on the outer peripheral side in each zone,
A transition area is recorded or reproduced such that the disk rotation speed is between a fixed rotation speed defined for the zone and a fixed rotation speed defined for one zone on the outer peripheral side of the zone. Therefore, continuous recording or reproduction is possible without waiting for still at the boundary of the zone, and recording and reproduction of information such as a video signal and an audio signal which requires continuity can be continued in real time.

[Brief description of drawings]

FIG. 1 is a block diagram showing an optical disc recording / reproducing apparatus according to first to fourth embodiments of the present invention.

FIG. 2 is a diagram showing a disc rotation speed setting example in the optical disc recording / reproducing apparatus according to the first embodiment of the present invention.

FIG. 3 is a diagram showing a disc rotation speed setting example in an optical disc recording / reproducing apparatus according to a second embodiment of the present invention.

FIG. 4 is a diagram showing a disk rotation speed setting example in an optical disk recording / reproducing apparatus according to a third embodiment of the present invention.

FIG. 5 is a diagram showing a configuration of a recording area of the optical disc medium according to the first to fourth embodiments of the present invention.

FIG. 6 is a diagram showing sector lengths on the optical disc medium in the first to fourth embodiments of the present invention.

FIG. 7 is a diagram showing the structure of a ZCLV format disc.

FIG. 8 is a diagram showing a conventional optical disc recording / reproducing apparatus.

FIG. 9 is a diagram showing an example of disc rotation speed setting in a conventional optical disc recording / reproducing apparatus.

[Explanation of symbols]

1 optical disk, 2 information recording / reproducing head, 3 address decoding means, 4 disk motor, 5 motor control means, 6 recording / reproducing means, 8 timing control means, 9
Zone determination means, 10 Motor rotation speed control means.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masami Shimamoto 2-3-3 Marunouchi, Chiyoda-ku, Tokyo Sanryo Electric Co., Ltd. (72) Kenji Goshima 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Sanryo Electric Co., Ltd. (72) Inventor Sadanobu Ishida 2-3-3 Marunouchi, Chiyoda-ku, Tokyo Sanryo Electric Co., Ltd.

Claims (10)

[Claims] 1. An optical disc whose recording area is divided into a plurality of zones by a circumferential boundary so that the number of disc revolutions is set to a constant number of revolutions determined for each zone. In an optical disk recording / reproducing method of recording and reproducing with a linear recording density kept substantially constant, one or more tracks on the outer peripheral side in each zone are defined as a transition area, and the number of disk rotations at the time of recording or reproduction in the transition area is An optical disk recording / reproducing method, wherein recording and reproducing are performed by setting a fixed rotation speed set for a zone and a fixed rotation speed set for a zone on the outer peripheral side of the one zone. 2. The optical disk recording / reproducing method according to claim 1, wherein the disk rotation speed when recording or reproducing in the transition area is continuously changed so as to be faster on the inner circumference side and slower on the outer circumference side. An optical disk recording / reproducing method characterized by the above. 3. The optical disc recording / reproducing method according to claim 1, wherein when the optical disc has a spiral information track that advances from an inner circumference to an outer circumference, the recording / reproducing is continuously performed. Except for the transition area of each zone, the optical disk is rotated at a constant rotation speed determined for each zone, and after entering the transition area of the zone, the disk rotation speed is gradually reduced, before entering the next zone. In addition, the optical disk recording / reproducing method is characterized in that the disk rotational speed is controlled to be a constant rotational speed determined for the next zone. 4. The optical disk recording / reproducing method according to claim 1, wherein when the optical disk has a spiral information track that advances from the outer circumference to the inner circumference, the recording / reproducing is continuously performed. Except for the transition area of each zone, the optical disk is rotated at a constant rotation speed determined for each zone, and after entering the transition area of the next zone, the disk rotation speed is gradually increased to An optical disk recording / reproducing method, characterized in that the disk rotational speed is controlled so as to reach the constant rotational speed of the next zone before passing through the transition area. 5. An optical disc whose recording area is divided into a plurality of zones by a circumferential boundary so that the disc rotation speed is set to a constant rotation speed determined for each zone. In an optical disk recording / reproducing apparatus that records and reproduces at a substantially constant linear recording density, the number of disk revolutions when recording or reproducing in a transition area composed of one or more tracks on the outer peripheral side in each zone is set to the zone. An optical disk recording / reproducing apparatus comprising means for setting between a predetermined constant rotation speed and a constant rotation speed determined for one zone on the outer peripheral side of the zone. 6. The optical disk recording / reproducing apparatus according to claim 5, wherein the disk rotation speed when recording or reproducing in the transition area is continuously changed so as to be faster on the inner circumference side and slower on the outer circumference side. An optical disk recording / reproducing apparatus characterized by the above. 7. The optical disk recording / reproducing apparatus according to claim 5, wherein when the optical disk has a spiral information track that advances from the inner circumference to the outer circumference, the recording / reproducing operation is performed continuously. Except for the transition area of each zone, the optical disk is rotated at a constant rotation speed determined for each zone, and after entering the transition area of the zone, the disk rotation speed is gradually reduced, before entering the next zone. In addition, the optical disk recording / reproducing apparatus is characterized in that the disk rotational speed is controlled to be a constant rotational speed determined for the next zone. 8. The optical disk recording / reproducing apparatus according to claim 5, wherein when the optical disk has a spiral information track which advances from the outer circumference to the inner circumference, the recording / reproducing operation is performed continuously. Except for the transition area of each zone, the optical disk is rotated at a constant rotation speed determined for each zone, and after entering the transition area of the next zone, the disk rotation speed is gradually increased to An optical disk recording / reproducing apparatus, characterized in that the disk rotational speed is controlled so as to become the constant rotational speed of the next zone before passing through the transition area. 9. The recording area is divided into a plurality of zones by a circumferential boundary, and the disk rotation speed is set to a constant rotation speed for each zone so that the linear recording density is substantially constant in all the zones. In the defined optical disk medium, one or more tracks are formed on the outer peripheral side in each zone,
A transition area is recorded or reproduced such that the disk rotation speed is between a fixed rotation speed defined for the zone and a fixed rotation speed defined for one zone on the outer peripheral side of the zone. An optical disk medium characterized by the above. 10. The optical disk medium according to claim 9, wherein the transition area is recorded or reproduced such that the disk rotation speed continuously changes so that the disk rotation speed becomes faster toward the inner circumference side and slower toward the outer circumference side. An optical disk medium characterized by the above.