JP3639538B2 - Recording control method for optical disc recording / reproducing apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical disk recording / reproducing apparatus configured to record a signal on a disk by a laser irradiated from an optical pickup and perform a reproduction operation of the signal recorded on the disk by the laser.
[0002]
[Prior art]
Disc players that use optical pickups to read signals recorded on discs have become widespread, but recently, in addition to the playback function, signals are recorded on the discs by a laser emitted from the optical pickups. An optical disc recording / reproducing apparatus configured so as to be able to be used has been commercialized.
[0003]
Also, recently, signals are recorded in a state in which the disk is rotationally controlled at a constant high linear velocity such as 2 times, 4 times, 6 times, 8 times, 10 times and 12 times the specified recording linear velocity. An optical disc recording / reproducing apparatus configured to be able to be used has been developed. In order to perform a recording operation while controlling the rotational speed of the disc with a constant linear velocity, it is necessary to accurately perform the rotational control operation of the spindle motor M, and there is a limit to further increasing the linear velocity. There is. For this reason, recently, a technique has been developed in which the recording speed is increased by performing the recording operation with the disk rotated at a constant angular velocity.
[0004]
The recording disk is recorded with information indicating the recording speed, that is, how many times the linear speed can be recorded with respect to the specified linear speed. Is configured so that the recording speed can be set by recognizing this information before starting the recording operation.
[0005]
[Problems to be solved by the invention]
When performing a recording operation with a constant linear velocity, the rotational speed of the disk, that is, the angular speed, is faster on the inner peripheral side of the disk than on the outer peripheral side, so the spindle that drives the disk to rotate when the recording position is on the inner peripheral side. It is necessary to increase the rotation speed of the motor. However, a spindle motor capable of high-speed rotation is not only expensive, but it is also very difficult to perform an accurate speed control operation. Therefore, the recording operation should be performed at the maximum recordable linear velocity of the disc. Will not be possible.
[0006]
As a method for solving such a problem, a technique has been developed in which a disk is rotated at a constant angular velocity and a signal recording operation is performed in this state. When signal recording is performed at a constant angular velocity, the linear velocity at the recording position increases as the recording position moves from the inner circumference side to the outer circumference side, and the linear velocity is the highest recordable speed of the disc. When the linear velocity is exceeded, there is a problem that the recording operation cannot be performed.
[0007]
The present invention is intended to provide a recording control method for an optical disc recording / reproducing apparatus that solves such problems.
[0008]
[Action]
The present invention relates to an optical disc recording / reproducing apparatus capable of recording operation with a constant angular velocity and recording operation with a constant linear velocity, and the recording start position is the highest recordable position after recognizing the highest recordable linear velocity based on the information recorded on the disc. It is determined whether or not the recordable position is based on the linear velocity, and the recording velocity control method is selected based on the decision.
[0009]
【Example】
FIG. 1 is a flowchart showing a recording control method of the present invention, and FIG. 2 is a block circuit diagram showing an embodiment of an optical disk recording / reproducing apparatus according to the present invention.
[0010]
In FIG. 2, reference numeral 1 denotes a disk placed on a turntable (not shown) that is rotationally driven by a spindle motor M, and is configured to be rotated by the rotation of the turntable. Also. On the disk 1, position information data indicating the position on the disk and information indicating the maximum recordable linear velocity provided in the disk are recorded by a groove called a pregroove, and based on a wobble signal obtained from the groove. Thus, a signal recording / reproducing operation is performed. Reference numeral 2 denotes a laser diode that irradiates the disk 1 with a light beam and a monitor diode that monitors light emitted from the laser diode, and a photodetector that receives the light beam reflected from the signal surface of the disk 1. An optical pickup incorporated therein is configured to be moved in the radial direction of the disk 1 by a pickup feeding motor (not shown).
[0011]
Reference numeral 3 denotes an RF signal amplifying circuit for amplifying an RF signal obtained from a photodetector incorporated in the optical pickup 2 and shaping the waveform, and reference numeral 4 denotes the signal based on the signal obtained via the RF signal amplifying circuit 3. A pickup control circuit for performing a focusing control operation for focusing the light beam of the optical pickup 2 on the signal surface of the disk 1 and a tracking control operation for tracking the light beam on the signal track of the signal surface; A servo circuit is incorporated.
[0012]
Reference numeral 5 denotes a digital signal processing circuit that performs digital signal processing of signals output from the RF signal amplification circuit 3 and performs demodulation operations of various signals. Reference numeral 6 denotes a digital signal that is processed by the digital signal processing circuit 5. If the information recorded on the disc 1 is an audio signal, it is converted to an analog signal and then output to an amplifier or the like. In the case of a data signal such as computer software, it is digital. The signal is output to the computer device 7 provided as a host as a signal.
[0013]
A system control circuit 8 receives a signal demodulated by the digital signal processing circuit 5 and performs various control operations in accordance with a command signal output from the computer device 7. A recording signal 9 such as a test signal or an information signal is inputted and a data signal or the like is recorded on the disk 1 by controlling a laser irradiation operation by a laser driving circuit (not shown) corresponding to the recording signal. This is a signal recording circuit.
[0014]
Reference numeral 10 denotes a buffer RAM in which signals recorded on the disk 1 are temporarily stored. Signals output from the computer device 7 are written, and signals are written and read by the control operation of the system control circuit 8. It is configured to be controlled. Reference numeral 11 denotes a spindle motor drive circuit whose operation is controlled by the system control circuit 8 and has a function of rotationally driving and controlling a spindle motor M that rotationally drives the disk 1. Then, the rotational drive operation by the spindle motor drive circuit 11 can be rotated in a state where the maximum recordable linear velocity provided in the disk 1 is constant at the outer peripheral side from the predetermined position of the disk 1. Moreover, it is comprised so that it can rotate in the state where angular velocity is constant.
[0015]
In such a configuration, during the recording operation of the signal to the disk 1, the signal output from the computer device 7 is stored in the buffer RAM 10, and the read operation of the stored signal is controlled to control the signal to the disk 1. The signal recording operation is controlled.
[0016]
As described above, the optical disk recording / reproducing apparatus according to the present invention is configured. Next, the reproducing operation in the circuit configured as described above will be described. When a command signal for performing a reproduction operation is output from the computer device 7 to the system control circuit 8 constituting the drive device, the control operation for the reproduction operation by the system control circuit 8 is started. When such a reproducing operation is performed, the laser diode incorporated in the optical pickup 2 is supplied with a driving current from which a laser output for performing a signal reading operation is obtained from the laser driving circuit. Is set.
[0017]
When the control operation for such reproduction operation is started, the rotation control operation of the spindle motor M by the spindle motor drive circuit 11 is performed. The rotation control operation of the spindle motor M is performed by decoding the wobble signal. The disk 1 is driven to rotate at a constant linear velocity by comparing the obtained synchronization signal with a reference signal output from a reference signal generation circuit (not shown). Such a control operation is similarly performed during a signal recording operation described later. In addition, when performing a reproducing operation with a constant angular velocity, the spindle motor M is rotationally driven and controlled so as to achieve a set angular velocity. Such a control operation is similarly performed during a signal recording operation described later.
[0018]
The rotation control operation of the spindle motor M is performed as described above. In the optical pickup 2 that performs the signal reading operation, the focusing control operation and the tracking control operation are started, and the signal from the disk 1 by the optical pickup 2 is started. The TOC data recorded in the lead-in area constituting the first session of the disk 1 is read prior to the reproduction operation.
[0019]
The reading / reproducing operation of the signal recorded in the signal recording area of the first session provided on the disc 1 is performed based on the TOC data recorded in the lead-in area. The signal read out by the optical pickup 2 is amplified and waveform-shaped through the RF signal amplifier circuit 3, and then input to the digital signal processing circuit 5, where the signal is demodulated. When signal processing is performed by the digital signal processing circuit 5 and information data is extracted, the information data is subjected to signal processing such as error correction and then applied to the signal reproduction circuit 6.
[0020]
When the information data read from the disk 1 is an audio signal, the signal reproducing circuit 6 converts the information data into an analog signal and outputs it to an amplifier or the like. Is output to the computer device 7 as a digital signal.
[0021]
As described above, the reproduction operation in this embodiment is performed. Next, the signal recording operation on the disk 1 will be described.
[0022]
In the operation of recording a signal on the disk 1, first, a drive current that provides an optimum laser output for the recording operation by recording and reproducing a test signal in a test writing area provided on the disk 1 is supplied to the laser diode. Is set as follows. When such a laser output setting operation is performed, an operation of reading information data recorded in an area called a buffer of the disk 1, that is, position information of a signal recorded in the signal recording area is performed.
[0023]
Based on the information data read out in this manner, a data signal recording operation can be performed in the signal recording area provided on the disc 1, and a recognition operation such as where the recording operation is performed is performed. Done.
[0024]
When such a recognition processing operation is completed, the optical pickup 2 is moved to a position where the recording operation on the disk 1 is started, and a recording signal writing operation to the buffer RAM 10 is performed. When a signal write operation to the buffer RAM 10 is performed, the amount of signals stored in the buffer RAM 10 gradually increases. When the storage amount exceeds a predetermined amount, the signal stored in the buffer RAM 10 is read and the read signal is input to the signal recording circuit 9. As a result, the control operation of the laser driving circuit by the signal recording circuit 9 is performed, and the signal is recorded on the disk 1.
[0025]
A signal recording operation to the disk 1 is performed by such an operation, but a signal writing operation to the buffer RAM 10 is performed in accordance with a signal reading operation from the buffer RAM 10 as a normal operation. Has been. In the signal writing operation to the buffer RAM 10, when a signal reading operation is performed, a new signal writing operation is repeatedly performed at a position where the read signal is stored.
[0026]
The recording operation described above is an operation in the case where the recording operation in all the recording areas provided on the disk 1 can be performed at a constant linear velocity and a constant angular velocity. Is the operation when the speed is about 12 times slower than the specified linear speed. Next, a recording control method that is the gist of the present invention will be described with reference to the flowchart shown in FIG.
[0027]
Such an operation is, for example, the case where the maximum recordable linear velocity of the disk 1 can be recorded at a high speed such as 24 times the prescribed velocity, and the spindle motor M has a linear velocity of 24 times on the inner circumference side. This is performed when it cannot be rotated.
[0028]
When the switching operation for performing the recording operation is performed after the disc 1 is inserted into the mounting portion provided in the optical disc recording / reproducing apparatus, the information recorded on the disc 1 is read out, and the read information is read out. Based on the above, the maximum recordable linear velocity of the disc 1 is recognized (step A). When recognition of the recordable maximum linear velocity disk 1 is provided with is made, whether the position to perform the recording operation of the signal, i.e. the recording start position is the position where it is able to perform the recording operation by the recordable maximum linear velocity constant Is determined (step B). Such a determination operation can be determined from the relationship between the linear velocity at the recording start position and the recordable maximum linear velocity when the rotational speed of the disk 1 by the spindle motor M is maximized. Such a determination operation is performed in advance. If data indicating the relationship between the position on the disk and the rotational speed is stored in a memory circuit or the like, it can be easily performed.
[0029]
In step B, and if the position for starting the recording operation is determined to be a position capable of performing recording operation by the recordable maximum linear velocity constant, the recording operation is performed at the recordable maximum linear velocity constant ( Step C). This way, the recording operation by the recordable maximum linear velocity constant is started, the recording position such recording operation is started will move to the outer peripheral side of the disc 1. In a state where a recording operation with a constant linear velocity is performed, the rotational angular velocity of the disk 1 gradually decreases as the recording position moves to the outer peripheral side. To the outermost peripheral position. In this way, a recording operation is performed at a constant maximum recordable linear velocity. However, when a recording operation cancel command is issued, the optical disc recording / reproducing apparatus is returned to a stopped state.
[0030]
In step B, and if the position for starting the recording operation is determined to be a position capable of performing recording operation by the recordable maximum linear velocity constant, recording operation by the recordable maximum linear velocity constant as described above Although takes place, then the position where Ru to initiate the recording operation will be described operation when it is determined that the position can not be carried out a recording operation by the recordable maximum linear velocity constant.
[0031]
If the position where Ru to initiate the recording operation is determined to be a position which can not be the recording operation is performed by the recordable maximum linear velocity constant, the recording operation is performed at a constant angular velocity (step D). In this way, the recording operation on the disk 1 that is rotationally driven at a constant angular velocity is started. In such a recording operation state, the linear velocity at the recording position increases as the recording position moves toward the outer peripheral side of the disk 1. It will be increased gradually. While such a recording operation with a constant angular velocity is being performed, it is determined whether or not the recording position has always moved to a position where a recording operation with a maximum recordable linear velocity can be performed (step E).
[0032]
While it is determined in step E that the recording position has not moved to a position where the recording operation can be performed with the maximum recordable linear velocity, the recording operation is performed with the constant angular velocity, but moved to the recordable position. If it is determined that the recording operation has been performed, the recording operation is switched to a state where the maximum recording linear velocity is constant (step F).
[0033]
In this way, the recording operation state at the constant angular velocity is switched to the recording operation state at the maximum recordable linear velocity. Thereafter, the recording operation at the maximum recordable linear velocity is performed until the end of recording.
[0034]
Switching to the state where the recording operation is performed at the maximum recordable linear velocity when it is determined that the recording position has moved to the position where the recording operation can be performed at the maximum recordable linear velocity in the recording operation state at the constant angular velocity. Although the operation is performed as described above, the operation of determining whether or not the linear velocity at the recording position has reached the maximum recordable linear velocity is stored in the positional information data recorded on the disk 1 and the memory circuit. it can be carried out on the basis of the to have data.
[0035]
【The invention's effect】
The present invention relates to information recorded on a disc in an optical disc recording / reproducing apparatus capable of performing a recording operation on a disc whose rotation is controlled at a constant angular velocity and a recording operation on a disc whose rotation is controlled at a constant linear velocity. After recognizing the maximum recordable linear velocity of the disc, the recording start position on the disc can be recorded at the maximum recordable linear velocity recognized from the information recorded on the disc. Is determined from the relationship between the linear velocity at the recording start position when the rotational speed of the disc by the spindle motor is maximized and the maximum recordable linear velocity of the disc, and the recording operation is performed based on the determination. After selecting the disc recording speed control method, the recording operation was started with the selected recording control method. Since so as to start the recording operation by the recording control method suitable for Chi recording start position can be performed efficiently recording operation.
[0036]
The present invention also provides a recording method by controlling the rotation of the disk at a constant maximum recordable linear velocity when it is determined that the recording start position is a recordable position at which a recording operation can be performed at the maximum recordable linear velocity. Since the operation is started and the subsequent recording operation is performed in a state where the rotation of the disk is controlled at a constant maximum recordable linear velocity, there is no need to perform a useless change operation of the speed control method.
[0037]
Then, when it is determined that the recording start position is a non-recordable position where the recording operation cannot be performed with the maximum recordable linear velocity , the recording operation is performed by controlling the rotation of the disk with the constant angular velocity. Since the operation to determine whether the position where the signal recording operation is performed is a position where the recording operation can be performed at a constant maximum recordable linear velocity is performed. The recording operation can be performed efficiently without starting the recording operation with a constant linear velocity.
[0038]
Further, the present invention performs the recording operation at a constant recordable maximum linear velocity when it is determined that the position where the signal recording operation is performed is a position where the recording operation at a constant recordable maximum linear velocity can be performed. Since the disk is controlled to rotate at the maximum recordable linear velocity at the same time, the recordable maximum linear velocity constant function set on the disc is used to the maximum. Recording operation can be performed. Therefore, according to the present invention, not only a recording operation can be performed efficiently, but also a recording operation with good characteristics can be performed.
[Brief description of the drawings]
FIG. 1 is a flowchart showing a recording control method of the present invention.
FIG. 2 is a block circuit diagram showing an embodiment of an optical disc recording / reproducing apparatus according to the present invention.
[Explanation of symbols]
1 Disc 2 Optical Pickup 4 Pickup Control Circuit 5 Digital Signal Processing Circuit 7 Computer Device 8 System Control Circuit 10 Buffer RAM
11 Spindle motor drive circuit

Claims (4)

A recording control method for a constant angular velocity Similar recording operation and the constant linear velocity Similar rotation controlled optical disk recording and reproducing apparatus capable of performing the recording operation to the disk is in the disk to be rotated controlled, are recorded on the disc after recognizing the recordable maximum linear velocity of the disk by reading the information, the recording start position on the disk can be performed recording operation by the recordable maximum linear velocity recognized from information recorded on the disk recording Whether or not it is a possible position is determined from the relationship between the linear velocity at the recording start position when the disc rotation speed by the spindle motor is maximized and the maximum recordable linear velocity of the disc, and the recording operation is performed based on the determination. after selecting the recording speed control method of a disk to perform, it was so as to start the recording operation at the selected recording control method Recording control method of the optical disk recording and reproducing apparatus characterized. When recording start position is determined to be recordable position capable of performing the recording operation by the recordable maximum linear velocity constant, with starting the recording operation by controlling the rotation disk in the recordable maximum linear velocity constant 2. The recording control method according to claim 1, wherein the subsequent recording operation is performed in a state in which the disk is rotationally controlled at a constant maximum recordable linear velocity . When recording start position is determined to be unrecordable position can not performing the recording operation by the recordable maximum linear velocity constant, the recording operation with starting the recording operation by controlling the rotation disk at a constant angular velocity 2. A determination operation as to whether or not a position where a signal recording operation is performed is a position where a recording operation can be performed with a constant maximum recordable linear velocity when in a state. The recording control method described. When it is determined that the position where the signal recording operation is performed is a position where the recording operation can be performed at a constant maximum recordable linear velocity, the recording operation is switched to a state where the recording operation is performed at a constant maximum recordable linear velocity, and thereafter 4. The recording control method according to claim 3, wherein the recording operation is performed in a state in which the disk is rotationally controlled at a constant maximum recordable linear velocity .

Images