JPH0533470B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a disk recording/reproducing apparatus using an optical disk, a magneto-optical disk, a magnetic disk, or the like. [Prior Art] Optical disks, magneto-optical disks, etc. have become extremely popular. Methods for controlling the rotation of the disk include a constant linear velocity method (CLV method) and a constant angular velocity method (CAV method). CLV
The method is to increase the rotational speed on the inner circumference and reduce the rotational speed on the outer circumference so that the linear velocity is always constant, and the angular velocity is always controlled to be constant.
Compared to the CAV method, the amount of data recorded can be increased, and since the recording density is constant, there is no need to change constants such as waveform equalization of the recording/reproducing circuit. However, in general, the CLV method requires a more complex configuration of the servo circuit that controls the rotation of the disk than the CAV method. In other words, the CLV type rotation control circuit roughly controls the rotation speed of the spindle motor from the playback position of the head on the disk, and also controls the rotation speed of the spindle motor so that the clock period in the data played back from the disk is a constant value. It is designed to perform precise control. Conventional disk recording and reproducing devices use either the CLV method or the CAV method for recording signals on the disk. [Problems to be solved by the invention] The conventional disk rotation control method is
If only one of CLV method or CAV method is used,
Problems have arisen in which the information recorded on the disc is restricted and the types of playback devices that can play back the disc are limited. Therefore, the object of this invention is to
It is possible to mix both recording areas that are played back using the CLV method and recording areas that are played back using the CAV method, and to adopt a preferred rotation control method depending on the recording signal, or the disk playback device that can be used can use any of the above methods. The object of the present invention is to provide a disk recording and reproducing device that enables the following. [Means for Solving the Problems] This invention provides a recording area 33 of the disk 1 in which tracks are formed in a spiral or concentric form, a first area 36 where recording or reproduction is performed at a constant linear velocity, and a first area 36 where tracks are recorded or reproduced at a constant angular velocity. a second area to be recorded or played back; and 3.
5 are provided and a predetermined track 34 of disk 1 is provided.
The address information (area ID) of the first area 36 and the second area 35 is recorded on the disk 1.
This disk recording and reproducing apparatus is characterized in that after loading, a predetermined track 34 is first reproduced, and the rotation control section 6 of the disk 1 is operated according to address information (area ID). [Function] Address information (area ID) recorded on a predetermined track 34 is first reproduced when the disc 1 is loaded, and this address information causes the rotation control unit 6 of the disc 1 to be controlled according to the reproduction position of the disc 1. A control signal for operating in the CLV system or CAV system is generated, and it is possible to correctly reproduce both the first area 36 and the second area 35 on the same disk 1. [Embodiment] FIG. 1 shows the configuration of an embodiment in which the present invention is applied to an optical disk recording and reproducing apparatus. In FIG. 1, 1 indicates a disk, and this disk 1 is rotated by a spindle motor 2. As shown in FIG. The disk 1 has a substrate made of glass or synthetic resin coated with a metal layer such as bismuth, and the surface is plated. The metal layer of the disk 1 is melted and deformed by the recording laser beam from the optical head 3 to form pits. On the other hand, the reading laser beam from the optical head 3 is modulated by the write data. A large number of spiral tracks are formed on the disk 1, and each of these tracks is divided into a plurality of sectors. The address part for each sector is pre-cutted in advance to determine whether there is a pit on the disk 1, and depending on the address reproduced from the address part, a digital signal can be recorded in the target sector or a digital signal can be recorded from the target sector. It is possible to reproduce the signal. The optical head 3 has an objective lens, a beam splitter, an optical modulator, a light receiving element, a focusing error detector, a tracking error detector, etc. The optical head 3 has a laser generating circuit including a semiconductor laser. Laser light is added from step 4.
Write data is supplied to the laser generating circuit 4 via the drive interface 5, and read data read by the optical head 3 is taken out via the drive interface 5. A power control signal is supplied from the drive interface 5 to the laser generating circuit 4 in order to increase the power of the laser beam during writing (recording) compared to when reading (reproducing). A servo circuit 6 is provided to rotate the disk 1 at a constant linear velocity or a constant angular velocity.
This servo circuit 6 is configured to be compatible with both the CLV method with a constant linear velocity and the CAV method with a constant angular velocity. Further, the optical head 3 can be threaded in the radial direction of the disk 1 by a thread feed section 7 consisting of a linear motor. The optical head 3 is provided with good focusing and tracking by a focusing and tracking servo 8. Focusing error and tracking error detection output is from system controller 1.
3. The system controller 9 has
A command via the drive interface 5 is supplied to the servo circuit 6, the thread feeding section 7,
Control signals for each of the focus and tracking servos 8 are sent to the system controller 9.
arises from. The drive interface 5 has the configuration shown in FIG. In Figure 2, 21 is 8
A block coding encoder is shown for converting bits into a 10-bit preferable pattern, that is, a pattern that can reduce DC components, and the output of this encoder 21 is supplied to a parallel-to-serial converter 22.
Write data is formed. The read data from the optical head 3 is serially transmitted via the limiter 23.
It is supplied to a parallel converter 24 and a PLL 25.
The output of the serial-parallel converter 24 is supplied to a block coding decoder 26 and a sync/mark detection circuit 27. The PLL 25 extracts a bit clock from the read data and transfers this bit clock to the decoder 26.
and the sync/mark detection circuit 27. The sync/mark detection circuit 27 generates a timing signal synchronized with the read data by detecting a sync signal and a mark (address mark or data mark) in the read data, and supplies this timing signal to the decoder 26. Furthermore, the drive controller 28 generates commands and power control signals to the system controller 9 for the drives. Formation of write data, processing of read data, and formation of data to the drive controller 28 are performed by the error correction code processor 11 and the buffer memory 1.
2. Performed by the system controller 13. The control conditions and display data pre-cut on the innermost track of disk 1 (this data will be described later) are on disk 1.
The system controller 13 controls the initial operation of the disk 1 so that the disk 1 is played immediately after being loaded, and the control conditions and display data are supplied to the system controller 13. By this,
Data related to the control conditions supplied to the drive controller 28 are generated by the system controller 13 . Further, the host processor 15 and the optical disk recording/reproducing device are coupled via the interface 14. This host processor 15 outputs the display data of the control conditions and display data reproduced from the innermost track to the CRT.
It is displayed on the screen of a display device 16 such as a liquid crystal. The error correction code processor 11 performs error correction encoding processing during recording, converts this error correction encoded recorded data into write data in a predetermined format, and performs error correction processing on read data during playback. It is something. As shown in FIG. 3, one track on disk 1 is divided into 20 sectors (0 to 19), for example, and the amount of data in one sector is 1 kbyte. Data is written and read in sector units, and data is transferred between the disk drive section and the host processor 15 in sector units. Each sector includes an address portion and a data portion. This address section is pre-cut with a predetermined data structure by the disk manufacturer. A sync signal and a mark signal are inserted into each of the address section and data section together with the address and data. FIG. 4 shows one side of the disk 1. FIG. A center hole 32 is formed in the center of the disk 1 for engaging the disk 1 with the rotating shaft. 33 is the approximate distance from the innermost track to the outermost track
This shows the recording area (program area) consisting of 19,000 tracks. A predetermined number of lead-in tracks are formed on the inner circumferential side of the recording area 33, and a predetermined number of lead-out tracks are formed on the outer circumferential side of the recording area 33. The tracks within the recording area have the data structure shown in FIG. Recording area 3
In the address portion of each sector of each track in the track 3, a track address that increases sequentially from the inner circumference toward the outer circumference and a sector address within the track are pre-cutted by the optical head 3. In this embodiment, information indicating the control conditions of the recording and reproducing apparatus when recording and reproducing the disc 1 is precut on the innermost track 34 of the recording area 33. This innermost track 3
4 is first read by the optical head 3 when the disc 1 is loaded into the recording and reproducing apparatus. This control condition and display data includes disk parameters, manufacturing ID, disk conditions, and area data.
It is broadly divided into ID and descriptive ID. An example of the control conditions and display data precut to the innermost track 34 will be shown below.

[Table] The above CLV coefficient (Ct) is a coefficient that indicates how many times the number of sectors per revolution of the disk 1 must be increased by one sector, and when using the CLV method, the servo circuit 6 is This is necessary for operating according to the playback position. Along with this,
CLV coefficient Ct) is determined by the recording method of the disc.
Is it a CLV method or a CAV method?
It is also used to distinguish whether both types are mixed. In other words, CAV method or CLV and
For CAV mixed disks, this
The CLV coefficient is treated as data of a specific bit pattern. Therefore, depending on the CLV coefficient, the servo circuit 6
The control operation is switched. The maximum number of sectors is the total number of sectors on one side of the disk 1.

[Table] The write guarantee period and read guarantee period of this manufacturing ID indicate the period (date) guaranteed by the manufacturer during which writing and reading can be performed correctly. The spare space is a data area prepared for when recording information related to manufacturing IDs is increased.

[Table] The A-side/B-side identification described above is used to distinguish the side of the disc on which recording or reproduction is to be performed. The above-mentioned writability indicates whether writing is possible or not, and when the entire surface of the disk is pre-cut, writing is not possible.

[Table] The above area IDs are used for each recording area when both CLV format recording areas and CAV format recording areas coexist in the pre-cutting area of one disc. This is to indicate the first and last positions of the track address by track address. The servo circuit 6 is switched according to the playback position of the disc 1 according to the ID for this area.
A disk in which the two methods are mixed can also be correctly rotated by the spindle motor 2. FIG. 5 shows an example in which a CLV system recording area and a CAV system recording area are mixed on the same disk 1. Of the recording area 33 of the disk 1,
A CAV recording area 35 is provided on the inner circumferential side,
A CLV recording area 36 is provided on the outer circumferential side. Between these two recording areas 35 and 36,
To compensate for the transient state when the operation of the servo circuit 6 changes, a no-signal area (guard space) is created.
37 are provided. In the case of the CAV method, the recording density of data on disk 1 is higher on the inner track, so
It is preferable to provide the CAV recording area 35 on the inner circumferential side. Further, in this example, digital data is recorded in both the recording area 35 and the recording area 36. This recording data may be pre-cut data or data newly recorded from the optical head 3. When performing pre-cutting, the same digital data may be recorded in both recording areas 35 and 36 so that it can be reproduced by either a CLV or CAV disc reproducing device. Further, unlike this embodiment, an analog signal, for example, an FM-modulated video signal, may be recorded in the CAV recording area 35.

〔Effect of the invention〕

According to this invention, the disk 1 can be provided with both the CLV recording area 36 and the CAV recording area 35, and the optimum rotation control method can be adopted depending on the type of recording signal, and the disc recording It is possible to avoid being restricted by the rotation control method of the playback device. However, since address information for identifying the recording areas of the two methods is pre-recorded on the innermost track 34, this address information is reproduced at the beginning when the disk 1 is loaded and given to the system controller. Therefore, regardless of the rotation control method, it is possible to correctly record on or reproduce data from a disc without requiring any troublesome operations.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the overall configuration of a recording and reproducing apparatus according to an embodiment of the present invention, FIG. 2 is a block diagram showing a partial configuration of an embodiment of the present invention, and FIG.
The figure is a schematic diagram showing the structure of data in one embodiment of the invention, and FIGS. 4 and 5 are plan views showing the track arrangement of a disk in one embodiment of the invention. 1: Disk, 2: Spindle motor, 3: Optical head, 4: Laser generation circuit, 5: Drive interface, 9, 13: System controller, 15: Host processor, 16: Display device,
33: Recording area, 34: Innermost track, 35:
CAV method recording area, 36: CLV method recording area.

Claims (1)

[Scope of Claims] 1. A recording area in which tracks are formed in a spiral shape or concentrically has a first area recorded or reproduced at a constant linear velocity and a second area recorded or reproduced at a constant angular velocity. A device for recording or reproducing a disk provided with address information for defining the respective positions of the first area and the second area on a predetermined track, the apparatus comprising: a control means for controlling the disc reading means so as to reproduce the predetermined track first; and a control means for controlling the disc reading means so as to reproduce the predetermined track first; What is claimed is: 1. A disk recording and reproducing apparatus comprising: a rotation control section for recording or reproducing an area at a constant angular velocity;