JPH04325959A - Disk type applying system for disk drive device - Google Patents

Abstract

PURPOSE:To record and reproduce data without fail even when the discriminating means of a disk type breaks down by switching rotating speed when the reproduced recorded data are not correct. CONSTITUTION:When a hole detection switch 26 breaks down, the disk type is erroneously discriminated, and a loaded optical disk 11 is driven at the rotating speed not suitable for the disk. In this case, since the bit cycle of a pulse signal outputted from a waveform equalizing and shaping circuit 24 is changed corresponding to the rotating speed, the correct data are not reproduced. In this way, when the recorded data are not correctly read, the rotating speed of a spindle motor 21 is switched to the rotating speed suitable for another type of the disk, and the recorded data are read again and checked. Thus, the recorded data in the optical disk 11 are correctly read next. When the recorded data are correctly read, a prescribed operation is started.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk type adaptation method for a disk drive device into which various disks with different rotational speeds are loaded.

0002

2. Description of the Related Art Optical disc devices are well known in which an optical disc cartridge containing an optical disc can be optionally attached to and removed from a drive unit. In this case, the optical disc has a write-once type WO (Write O
nce) type, and MO (Magn) type, which is a rewritable type.
There is an optical memory (et-optical memory) type. Generally, WO type optical discs and MO type optical discs have different rotational speeds.

By the way, according to the ISO standard, as shown in FIG.
Identifier hole Ha indicating the specifications of the optical disc cartridge
, Hb. These identifier holes Ha and Hb correspond to the A side and B side of the optical disc, respectively, and the presence or absence of each hole indicates various specifications of the built-in optical disc.

[0004] In recent years, when any optical disc cartridge, be it a WO type or an MO type, is installed in a single drive device, the drive device determines the disc type and performs data recording and reproduction under predetermined control. Optical disk devices are in practical use. In this case, the drive device is provided with a detection switch that is in contact with each of the identifier holes Ha and Hb on the cartridge side, and the specification of the loaded optical disc is determined by this detection switch.

However, when this detection switch malfunctions and, for example, a WO type optical disc is loaded, the M
It may be determined that an O-type optical disc is loaded. In this case, the drive device drives the disk at a rotational speed suitable for the MO type, so data cannot be recorded or reproduced.

[0006]

[Problem to be solved by the invention] In this way, conventionally,
There is a problem in that if the determining means for determining the disc type fails, data cannot be recorded or reproduced.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a disk type adaptation method for a disk drive device that allows data to be recorded and played back without fail even if the determining means for determining the disk type fails. do.

[0008]

[Means for Solving the Problems] To this end, the first invention includes means for switching the rotational speed of the disk to each stored rotational speed, and means for reproducing data recorded on the disk at each rotational speed. and a means for determining whether the reproduced recorded data is correct or not, the apparatus reproduces the recorded data at a rotational speed corresponding to the determined disc type, determines the data, and if the data is incorrect, changes the rotational speed of the disc. While sequentially switching to each rotational speed, recorded data is reproduced to determine whether it is correct or not, and when correct recorded data is obtained, the rotational speed is fixed at that rotational speed and predetermined data is recorded and reproduced.

[0009] Also, in the second invention, there is provided a means for switching each period for recording and reproducing data one bit at a time, a means for reproducing recorded data on the disk in each period and each rotation speed, and a means for reproducing recorded data on the disk in each period and at each rotation speed. and a means for determining whether the recorded data is correct or not by reproducing the recorded data at a rotational speed corresponding to the determined disc type and a prescribed constant cycle, and if the recorded data is incorrect, the above-mentioned cycle is sequentially switched according to the ratio of the rotational speed at that time to the rotational speed suitable for each type of disk, and the recorded data is played back to determine its correctness. When the correct recorded data is obtained, the rotational speed is changed. is fixed to record and reproduce predetermined data.

0010

[Operation] If the reproduced recorded data is incorrect, the settings are changed so that the correct recorded data is reproduced by switching the rotational speed or data recording/reproducing cycle. Even if the rotational speed is incorrectly set, data can always be recorded and reproduced.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram of the main parts of an optical disc device according to an embodiment of the present invention, showing a state in which an optical disc cartridge 1 is installed in a drive device 2. As shown in FIG. In the figure, an optical disc 11 in an optical disc cartridge 1 is chucked onto 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 recorded information on the optical disc 11, and its output signal is input to a waveform equalization shaping circuit 24. The output signal of the waveform equalization shaping circuit 24 is transmitted to a discriminator 25 in the data reproducing circuit 25.
1 and is input to 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 reproducing circuit 25 is input to the discriminator 2.
51 and a PLL synchronization signal generation circuit 252.

The hole detection switch 26 is for detecting an identifier hole formed in the case body of the optical disc cartridge. The detection result of the Hall detection switch 26 and the output signal of the data reproducing circuit 25 are input to a control section 27, and a control signal is output from the control section 27 to the motor drive circuit 22.

Although not shown, in addition to the above-mentioned parts, there is also a circuit for 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. The means etc. are provided.

With the above configuration, the optical disc device of this embodiment is a CAV (Constant Angular V
It is assumed that both WO type and MO type optical discs are equipped with the function of recording and reproducing data.

When using this optical disc device, an operator installs a desired type of optical disc cartridge 1 into the drive device 2.

As shown in FIG. 2, when the optical disc cartridge 1 is installed in the drive device 2 (process 101),
, determines the disc type of the optical disc cartridge 1. That is, as shown in FIG. 5, the case body of the optical disc cartridge 1 is formed with an identifier hole, and depending on whether or not there is a recess at each predetermined position, various specifications such as the disc type of the built-in optical disc 11 are indicated. ing. The hole detection switch 26 is composed of a plurality of mechanical contacts that are turned on and off depending on the presence or absence of a recess at each of the above positions. The control unit 27 determines whether the installed optical disc cartridge 1 is a WO type or an MO type by detecting the on/off state of the contact (process 10
2).

By the way, in general, the rotational speed of an optical disc is, for example, 1000 rpm for a WO type, and 1000 rpm for an MO type.
The type differs depending on the disc type, such as 1800 rpm.

[0020] The control unit 27 stores in advance a rotation speed suitable for each disc type. Then, the motor drive circuit 22 is controlled to drive the optical disc 11 at a rotational speed corresponding to the determined disc type (process 103).

Next, the optical pickup 23 accesses a recording track at a predetermined position, performs a predetermined reading operation, and outputs a reproduced signal. The waveform equalization and shaping circuit 24 amplifies the reproduced signal, modifies the waveform, and converts it into a predetermined pulse signal.

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

The PLL synchronization signal generation circuit 252 includes a PLL that generates a signal of a constant frequency in synchronization with an input signal.
(Phase Locked Loop) circuit, the frequency of which is set to the above period. Thereby, the PLL synchronization signal generation circuit 252 outputs a synchronization signal of a constant period based on the pulse signal. Discriminator 25
1 determines the presence or absence of a signal in the pulse signal according to the synchronization signal. Further, the decoder 253 reproduces the recorded data according to the determination result and the synchronization signal (processing 1
04).

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

By the way, for example, the Hall detection switch 26
If the Hall detection switch 26 fails, such as when a contact is damaged, the disc type may be incorrectly determined and the optical disc 11 may be driven at a rotation speed that is not suitable for the loaded optical disc 11. In this case, the bit period of the pulse signal output from the waveform equalization shaping circuit 24 changes depending on the number of rotations, so that correct recorded data will not be reproduced. In this way, if the correct recorded data cannot be read (N in process 105), the rotational speed of the spindle motor 21 is switched to the rotation speed suitable for the other type of disk (process 106), and the recorded data is read again. is read and checked (processing 104). This results in
Next, the recorded data on the optical disc 11 can be read correctly. When the recorded data is correctly read (Y in process 105), the process moves to a predetermined operation.

As described above, in this embodiment, the optical disc 11 is driven at the rotational speed of the determined disc type to read recorded data, and if the recorded data cannot be read correctly,
The rotation speed is switched to that of the other type. As a result, even if the hole detection switch 26 malfunctions and the disc type is incorrectly determined, data can always be recorded and reproduced on the loaded disc.

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

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

With this configuration, as shown in FIG. 4, when the optical disc cartridge 1 is installed (process 101), the disc type is determined (process 102).
), the optical disc 11 is driven at a rotational speed according to the disc type (process 103).

At this time, the PLL synchronization signal generation circuit 252
The signal period of the synchronization signal in is set to the normal constant period, which is the setting value of the above embodiment (processing 107). Then, as in the embodiment described above, the recorded data is read (process 104), the data is checked (process 105), and if the recorded data is correct (Y in process 105), the process moves to a predetermined process.

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

That is, for example, suppose that the installed optical disc cartridge 1 is determined to be of the WO type, the optical disc 11 is driven at 1000 rpm, and at this time, predetermined recorded 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 rotational speed of the MO type optical disc is 1800 rpm, and the signal period of the synchronization signal currently set in the PLL synchronization signal generation circuit 252 is T0.

In this case, the PLL synchronization signal generation circuit 252
The signal period T1 to be newly set is set as shown in the following equation.

[0035]

[Math 1] T1=T0×(1800/1000)

003
6] In this way, the signal period of the synchronizing signal is changed by the proportion that the actual rotational speed at that time deviates from the rotational speed suitable for the optical disc loaded (processing 108).

Similarly, the recorded data is read and checked (proceed to process 104). This results in
The rotation speed of the optical disc 11 remains adapted to the other disc type, and the data recorded on the currently loaded optical disc 11 can be read correctly. In this way, if the data can be read correctly (Y in process 105), the process moves to a predetermined operation.

As described above, in this embodiment, if recorded data cannot be read correctly, the timing at which data is read bit by bit from the reproduced signal is changed by changing the signal period of the synchronization signal. The system is designed to read data recorded on a different type of disc. As a result, the Hall detection switch 2
6 is out of order, data will always be recorded and reproduced.

[0039] In the above embodiment, WO type and M
Although the explanation has been given by taking as an example an optical disk device that uses two types of optical disks called O type, the present invention is equally applicable to an optical disk device that is equipped with three or more types of optical disks with different rotational speeds, regardless of the disk types. Of course it can be done.

Furthermore, although the case of the CAV method in which both the rotational speed and the data recording/reproduction period are constant has been described, there are other methods in which the rotational speed and the recording/reproduction period are changed depending on the track position. In the case of these systems, the present invention can be applied by switching the rotational speed and recording/reproducing frequency at a constant ratio.

Further, in the above embodiment, only the operation of reproducing recorded data has been described, but data may be recorded by a known method. Furthermore, when recording data with the rotational speed set incorrectly, the data can be recorded correctly by recording each bit of data at the signal cycle of the set synchronization signal.

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

[0043]

Effects of the Invention As described above, according to the present invention, when correct recorded data is not reproduced, the rotation speed and data can be changed to 1.
I changed the recording and playback cycle bit by bit and changed the settings so that the correct recorded data was played back.
Even if the disk type discrimination means fails and the rotational speed is set incorrectly, data can always be recorded and reproduced.

[Brief explanation of drawings]

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

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

FIG. 3 is a block diagram of parts 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]

1 Optical disc cartridge 2 Drive device 11 Optical disc 21 Spindle motor 21a Turntable 22 Motor drive circuit 23 Optical pickup 24 Waveform equalization shaping circuit 25 Data reproduction circuit 26 Hall detection switch 27 Control section 251 Discriminator 252 PLL synchronization signal generation circuit 252a Signal period variable means 253 Decoder

Claims (2)

[Claims] 1. Means for storing respective rotational speeds adapted to various types of disks, means for determining the type of the built-in disk when a disk cartridge is installed, and rotational speeds corresponding to the determined types. In a disk type adaptation method of a disk drive apparatus having means for driving the disk at a speed of 100 degrees, and means for recording and reproducing data on the driven disk, the rotational speed of the disk is stored as necessary. a speed switching means for switching to each rotational speed, a data reproducing means for reproducing the recorded data of the disc at each rotational speed, and a data determining means for determining whether the reproduced recorded data is correct or not, and according to the determined type of the disc. If the recorded data played back at the corresponding rotational speed is incorrect, play the recorded data while sequentially switching the rotational speed of the disk to each of the above memorized rotational speeds to determine whether it is correct or not, and check whether the recorded data is correct. Fixed at that rotation speed when played,
A disc type adaptation method for a disc drive device that performs data recording and reproduction. 2. Means for storing respective rotation speeds adapted to various types of disks, means for determining the type of the built-in disk when the disk cartridge is installed, and rotation speeds corresponding to the determined types. In a disk drive apparatus having means for driving the disk at a constant cycle, and means for recording and reproducing data one bit at a time on each of the various types of disks to be driven, the period for recording and reproducing data is defined as each cycle. a data reproducing means for reproducing the recorded data of the disc at each of the periods and at each of the rotational speeds, and a data determining means for determining whether the reproduced recorded data is correct or not; If the recorded data reproduced at the rotational speed corresponding to the type of disc and at the above-mentioned constant cycle is incorrect, the above-mentioned cycle is sequentially switched according to the ratio of the rotational speed at that time and the rotational speed suitable for each type of disc. A disk type adaptation system for a disk drive device, which is characterized in that the recorded data is reproduced to determine whether it is correct or not, and when the correct recorded data is reproduced, the rotational speed is fixed at that rotational speed and the data is recorded and reproduced.