JP3140796B2 - Disk drive device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive in which various disks having different rotation speeds are mounted.

[0002]

2. Description of the Related Art An optical disk device in which an optical disk cartridge containing an optical disk can be arbitrarily attached to and detached from a drive device is well known. In this case, the optical disc in this case has a WO (Write On)
ce) type and MO (Magne
There is a t-optical memory type. Generally, the rotation speed of a WO type optical disk differs from that of an MO type optical disk.

[0003] According to the ISO standard, as shown in FIG.
Identifier hole H indicating the specification of the optical disk cartridge
a, Hb are to be formed. These identifier holes Ha and Hb respectively correspond to the A and B sides of the optical disc, and the presence or absence of each hole indicates various specifications of the built-in optical disc.

In recent years, when either optical disk cartridge, WO type or MO type, is arbitrarily attached to one drive device, the drive device determines the disc type and performs data recording / reproducing under predetermined control. Optical disk devices have been put to practical use. In this case, the drive device is provided with a detection switch in contact with each of the identifier holes Ha and Hb on the cartridge side, and the specification of the mounted optical disc is determined by the detection switch.

However, when the detection switch fails and, for example, a WO type optical disc is mounted, the M
In some cases, it is determined that an O-type optical disk is mounted. In this case, since the drive device drives the disk at a rotational speed adapted to the MO type, data cannot be recorded or reproduced.

[0006]

As described above, conventionally,
If the discriminating means for discriminating the disc type breaks down, there is a problem that data recording and reproduction cannot be performed.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problem and to provide a disk type adaptation method of a disk drive device capable of always recording and reproducing data even when a determination means for determining the disk type fails. I do.

[0008]

For this purpose, according to the first aspect of the present invention, means for switching the rotational speed of a disk to each of the stored rotational speeds, and means for reproducing recorded data on the disk at each rotational speed. Means for judging whether or not the reproduced recorded data is correct. The recorded data is reproduced at a rotational speed corresponding to the disc type thus discriminated, and the discriminated data is judged. While sequentially switching the speed to each of the pre-stored rotation speeds, the recorded data is reproduced to judge whether it is correct, and when correct record data is obtained, the speed is fixed to the rotation speed,
Recording and reproduction of predetermined data are performed.

Further, in the invention according to claim 2, means for switching to each cycle for recording and reproducing data one bit at a time,
Means for reproducing the recorded data of the disc in each of these cycles and each of the rotational speeds, and means for determining whether the reproduced recorded data is correct or not. The recorded data is reproduced to determine whether it is correct.If the recorded data is not correct, the recording is performed while sequentially switching the cycle according to the ratio between the rotational speed at that time and each of the previously stored rotational speeds. The data is reproduced to determine whether the data is correct, and when correct recording data is obtained, recording and reproduction of predetermined data are performed with the cycle fixed.

[0010]

When the reproduced recording data is not correct, the setting is changed so that the correct recording data is reproduced by switching the rotation speed or the data recording / reproducing cycle. Even if the rotation speed is incorrectly set, data can be recorded and reproduced without fail.

[0011]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram of a main part of an optical disk device according to an embodiment of the present invention, and shows a state where an optical disk cartridge 1 is mounted on a drive device 2. In the figure, an optical disk 11 in an optical disk cartridge 1 is chucked on a turntable 21a, and the turntable 21a is driven by a spindle motor 21. The spindle motor 21 is controlled by a motor drive circuit 22.

The optical pickup 23 reads information recorded on the optical disk 11, and its output signal is input to a waveform equalizing and shaping circuit 24. The output signal of the waveform equalizing and shaping circuit 24 is supplied to a discriminator 25 in the data reproducing circuit 25.
1 and the PLL synchronization signal generation circuit 252. The output signal of the discriminator 251 is input to the decoder 253, and the output signal of the data recovery circuit 25 is input to the discriminator 251 and the PLL synchronization signal generation circuit 252.

The hole detection switch 26 detects an identifier hole formed in the case of the optical disk cartridge. The detection result of the hole detection switch 26 and the output signal of the data reproduction circuit 25 are input to the control unit 27, and the control signal is output from the control unit 27 to the motor drive circuit 22.

Although not shown, in addition to the above components, a circuit for performing tracking control and focus control of the optical pickup 23, a circuit for recording information, and a drive for moving the optical pickup 23 to a predetermined track position. Means and the like are provided.

With the above configuration, the optical disk device of this embodiment has a constant angular velocity (CAV) in which both the rotation speed and the data recording / reproducing cycle are constant.
ocity) system, and both the WO type optical disk and the MO type optical disk have a function of recording and reproducing data.

When using this optical disk device, an operator mounts an optical disk cartridge 1 of a desired type in the drive device 2.

As shown in FIG. 2, when the optical disk cartridge 1 is mounted on the drive device 2 (step 10).
1) The disc type of the optical disc cartridge 1 is determined. That is, an identifier hole is formed in the case body of the optical disc cartridge 1 as shown in FIG.
Various specifications such as the disc type of the built-in optical disc 11 are indicated depending on whether or not there is a dent at each predetermined position.
The hole detection switch 26 is constituted by a plurality of mechanical contacts that are turned on and off according to the presence or absence of the recess at each of the above positions.
The control unit 27 determines whether the mounted optical disc cartridge 1 is of the WO type or the MO type by detecting the on / off state of the contact (Step 10).
2).

Generally, the rotational speed of an optical disk is, for example, 1000 rpm for a WO type optical disk, and
The type differs depending on the disc type, such as 1800 rpm.

The control unit 27 stores in advance a rotation speed adapted to each disk type. Then, the motor drive circuit 22 is controlled to drive the optical disk 11 at a rotation speed corresponding to the determined disk type (process 103).

Next, the optical pickup 23 accesses a recording track at a predetermined fixed position, executes a predetermined reading operation, and outputs a reproduction signal. The waveform equalizing and shaping circuit 24 amplifies the reproduced signal, corrects the waveform, and converts the signal into a predetermined pulse signal.

In this embodiment, it is assumed that the cycle of recording and reproducing data on the optical disk one bit at a time is constant irrespective of the disk type.

A PLL synchronizing signal generating circuit 252 includes a PLL for generating a signal of a constant frequency in synchronization with an input signal.
(Phase Locked Loop) circuit,
The frequency is set to the above cycle. This allows
The PLL synchronization signal generation circuit 252 outputs a synchronization signal having a constant period based on the pulse signal. Discriminator 251
Determines the presence or absence of a signal in the pulse signal according to the synchronization signal. The decoder 253 reproduces the recorded data according to the result of the determination and the synchronization signal (Process 10).
4).

The control section 27 checks the reproduced data (step 105). Now, assuming that the optical disk 11 is driven at a predetermined speed and the recorded data is read,
The preformat data recorded in advance when the optical disk 11 is formatted and the user data recorded by the user after that are correctly reproduced. When the correct data is read in this way (Y in process 105), the process proceeds to a predetermined operation for recording and reproducing data.

By the way, for example, the hole detection switch 26
If the hole detection switch 26 breaks down, for example, when the contact point is damaged, the disc type may be erroneously determined and the disc may be driven at a rotation speed that does not match the loaded optical disc 11. In this case, since the bit period of the pulse signal output from the waveform equalizing and shaping circuit 24 changes according to the number of rotations, correct recorded data cannot be reproduced. As described above, when the correct recording data cannot be read (N in Step 105), the rotation speed of the spindle motor 21 is switched to the rotation speed suitable for the other type of disk (Step 106), and the recording data is again recorded. Is read and checked (process 104). This allows
Next, the recorded data on the optical disk 11 can be read correctly. If the recorded data is correctly read (Y in process 105), the process proceeds to a predetermined operation.

As described above, in the present embodiment, the optical disk 11 is driven at the rotational speed of the determined disk type to read the recorded data.
The other type of rotation speed is switched. As a result, even when the hole detection switch 26 fails and the disc type is erroneously determined, data can be recorded / reproduced with respect to the loaded disc without fail.

Next, another embodiment of the present invention will be described.

The optical disk apparatus of this embodiment has the same configuration as that of FIG. 1, but includes a signal period varying means 252a in the PLL synchronization signal generation circuit 252 as shown in FIG. 27. The signal period varying means 252a changes the signal period of the synchronization signal output from the PLL synchronization signal generation circuit 252 stepwise by changing the lock frequency of the PLL circuit.

In this configuration, as shown in FIG. 4, when the optical disk cartridge 1 is mounted (step 101), the type of the disk is determined (step 10), as in the previous embodiment.
2) The optical disk 11 is driven at a rotation speed according to the disk type (process 103).

At this time, the PLL synchronization signal generation circuit 252
The signal cycle of the synchronization signal in is set to a normal constant cycle which is the set value of the above embodiment (process 107). Then, similarly to the above embodiment, the recording data is read (process 104), and the data is checked (process 105).
If the recording data is correct (Y in process 105), the process proceeds to a predetermined process.

On the other hand, if the correct recording data cannot be read (N in process 105), the PLL synchronization signal generation circuit 2
The signal period of the synchronization signal of 52 is switched.

That is, for example, it is assumed that the loaded optical disk cartridge 1 is determined to be of the WO type and the optical disk 11 is driven at 1000 rpm. At this time, it is assumed that predetermined recording data cannot be read. In this case, the mounted disk is considered to be of the MO type.

Here, it is assumed that the predetermined rotation speed of the MO type optical disk is 1800 rpm, and the signal period of the synchronization signal set in the PLL synchronization signal generation circuit 252 is T0.

In this case, PLL synchronization signal generation circuit 252
Is newly set as in the following equation.

[0035]

T1 = T0 × (1800/1000)

As described above, the signal period of the synchronization signal is changed by the ratio of the actual rotation speed at that time to the rotation speed adapted to the loaded optical disk (process 108).

Then, similarly, the recording data is read and the data is checked (to process 104). This allows
While the rotation speed of the optical disk 11 remains adapted to the other disk type, the recorded data of the currently mounted optical disk 11 can be read correctly.
In this way, when the data is correctly read (Y in the process 105), the process proceeds to a predetermined operation.

As described above, in this embodiment, when the recording data cannot be read correctly, the timing for reading data from the reproduction signal one bit at a time is changed by changing the signal period of the synchronization signal. Thus, the recording data of another type of disc is read. Thereby, similarly to the above-described embodiment, the hole detection switch 2
Even if a failure occurs in 6, the recording and reproduction of data is always performed.

In the above embodiment, the WO type and the M
Although the optical disk device using two types of optical disks called O type has been described as an example, the present invention is similarly applied to an optical disk device in which three or more types of optical disks having different rotation speeds are mounted regardless of those disk types. What you can do is obvious.

Although the CAV method in which both the rotation speed and the data recording / reproduction cycle are constant has been described as an example, there is another method in which the rotation speed and the recording / reproduction cycle are changed according to the track position. In the case of these methods, the present invention can be applied by switching the rotation speed and the recording / reproducing frequency at a fixed ratio.

Further, in the above-described embodiment, only the operation of reproducing recorded data has been described, but data recording may be performed by a known method. When data is recorded in a state where the rotation speed is incorrectly set, data can be correctly recorded by recording each bit of the data in the set signal period of the synchronization signal.

Furthermore, although the case of the optical disk device has been described as an example, the present invention can be similarly applied to a magneto-optical disk device or a magnetic disk device using various disks having different rotation speeds.

[0043]

As described above, according to the present invention, when correct recording data is not reproduced, the setting is changed so that the rotation speed and the data recording / reproducing cycle are changed to reproduce the correct recording data. Thus, even if the disc type discriminating means fails and the rotational speed is incorrectly set, data can be recorded and reproduced without fail.

[Brief description of the drawings]

FIG. 1 is a block diagram of a main part of an optical disk device according to an embodiment of the present invention.

FIG. 2 is an operation flowchart of the optical disk device.

FIG. 3 is a block diagram of a portion different from FIG. 1 in another embodiment of the present invention.

FIG. 4 is an operation flowchart of the optical disc device of the embodiment.

FIG. 5 is a plan view showing an identifier hole portion of the optical disc cartridge.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical disk cartridge 2 Drive device 11 Optical disk 21 Spindle motor 21a Turntable 22 Motor drive circuit 23 Optical pickup 24 Waveform equalization shaping circuit 25 Data reproduction circuit 26 Hole detection switch 27 Control part 251 Discriminator 252 PLL synchronization signal generation circuit 252a Signal period Variable means 253 decoder

Continued on the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G11B 19/02 G11B 19/06 G11B 19/12 G11B 19/28 G11B 23/28

Claims (2)

(57) [Claims] 1. A disk drive device for driving a disk for recording and reproducing data, comprising: storage means for storing in advance respective rotational speeds corresponding to various types of disks; Discriminating means for discriminating the disc type determined, driving means for driving the disc at the previously stored rotational speed corresponding to the disc type discriminated by the discriminating means, and driving means driven by the driving means Recording / reproducing means for recording / reproducing data to / from the disc, data determining means for determining whether the recorded data reproduced by the recording / reproducing means is correct, and the recording data determined by the data determining means is incorrect. In this case, while sequentially switching the rotation speed of the disk to each rotation speed stored in the storage means, A disk drive device comprising: drive switching means for driving a disk; when recorded data is correctly reproduced, the recording and reproduction of the data is performed at a fixed rotation speed. 2. A disk drive device for driving a disk for recording and reproducing data, comprising: storage means for preliminarily storing respective rotational speeds corresponding to various types of disks; Discriminating means for discriminating the disc type determined, driving means for driving the disc at the previously stored rotation speed corresponding to the disc type discriminated by the discriminating means, Recording / reproducing means for recording / reproducing data at regular intervals on the disc; data determining means for determining whether the recorded data reproduced by the recording / reproducing means is correct; and recording data determined by the data determining means. If the rotation speed is not correct, each rotation speed stored in the storage means is sequentially taken out and the data of the disk is read out. Data playback cycle,
Data reproduction cycle switching means for reproducing the recorded data while sequentially switching the data in accordance with the ratio between the rotation speed at that time and the rotation speed sequentially taken out of the storage means, and when the recorded data is reproduced correctly, the data reproduction is performed. A disk drive device for recording and reproducing data at a fixed cycle.