JP3723446B2 - 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]
Recently, the signal is controlled in a state where the rotation of the disk is controlled at a constant high linear velocity such as 2 times, 4 times, 6 times, 8 times, 10 times and 12 times with respect to the prescribed recording linear velocity. An optical disc recording / reproducing apparatus configured to be able to record a disc has been developed. In an optical disc recording / reproducing apparatus capable of performing recording operations at such a plurality of linear velocities, the recording operation is generally performed at the fastest linear velocity provided in the apparatus.
[0004]
[Problems to be solved by the invention]
The optical disk recording / reproducing apparatus is configured to perform a signal recording operation in accordance with a recording command from the computer device side which is a host. Such a recording operation temporarily stores a signal to be recorded on the disk in a buffer RAM, A signal recording operation is performed on the disk by reading a signal stored in the buffer RAM.
[0005]
In addition, such an optical disk recording / reproducing apparatus performs an operation of recording a test signal while changing the laser output in a test writing area provided on the inner periphery side of the disk and performing a reproduction operation of the recorded signal. Accordingly, an operation for setting a laser output suitable for performing a recording operation is performed.
[0006]
Such a laser output setting operation is performed at a linear velocity set for performing a recording operation, and a signal is recorded on the disk by the linear velocity. When the disk is rotationally driven in a state where the linear velocity is constant, the rotational speed on the inner peripheral side of the disk is higher than that on the outer peripheral side. Since the test writing area used for performing the laser output setting operation is provided on the inner circumference side of the disk, it rotates at the highest speed.
[0007]
The spindle motor that drives the disk is required to rotate at high speed as the recording speed increases. However, in order to reduce the size, reduce power consumption, and reduce the manufacturing cost, the spindle motor must be close to the limit performance. It is used. In the optical disk recording / reproducing apparatus using such a spindle motor, when the supply power voltage is lowered, the rotational speed of the disk may not be increased to a linear speed for performing a high-speed recording operation in the test writing area. In this case, since it is not possible to set a laser output suitable for a high-speed recording speed, there is a problem that a high-speed recording operation cannot be performed.
[0008]
The present invention is intended to provide an optical disc recording / reproducing apparatus that can solve such a problem.
[0009]
[Means for Solving the Problems]
In the present invention, when the rotational speed of the disk cannot be set to the high-speed recording speed at the time of setting the laser output at a high recording speed, the laser output is set at the rotational speed at that time, and then the rotation is possible. The laser output is set at a predetermined low-speed recording speed slower than the speed, and the rotation speed, the laser output set at the rotation speed, the laser output set at the low-speed recording speed and the low-speed recording speed are set. Based on this, the laser output corresponding to the high-speed recording speed is calculated.
[0010]
【Example】
FIG. 1 is a flow chart for explaining the operation 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. 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 rotationally driven by the rotation of the turntable. Also. On the disc 1, position information data is recorded by a groove called a wobble, and a signal recording / reproducing operation is performed based on a wobble signal obtained from the groove. 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 a signal recorded on the disk 1 is temporarily stored. A signal output from the computer device 7 is written, and a signal storing operation and a reading operation are controlled by a control operation of the system control circuit 8. It is configured to be. The signal stored in the buffer RAM 10 is stored and held after being read out to be recorded on the disk 1, and then a new signal output from the computer device 7 is stored at that position. In this way, the information is sequentially overwritten and erased.
[0015]
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. Such rotational drive control operation is to rotate at a constant linear velocity such as 2 times, 4 times, 6 times, 8 times, 10 times and 12 times the prescribed speed as well as the prescribed linear speed. It is configured to be able to.
[0016]
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. When the recording operation of the signal to the disk 1 is interrupted, when the recording operation is resumed, the signal stored in the buffer RAM 10 and the signal recorded on the disk 1 before the interruption are The comparison operation is performed so that the signal is recorded continuously with the signal recorded before the interruption, that is, the signal is recorded by a method called seamless.
[0017]
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.
[0018]
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.
[0019]
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.
[0020]
The read / play operation of the signal recorded in the signal recording area of the first session created on the disc 1 is performed based on recording information data called 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.
[0021]
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.
[0022]
As described above, the reproduction operation in this embodiment is performed. Next, the signal recording operation on the disk 1 will be described.
[0023]
The operation of recording a signal on the disc 1 is performed by first setting and outputting a laser output optimum for the recording operation by recording and reproducing a test signal in a test writing area provided on the disc 1. This setting will be described later. 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.
[0024]
When such 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 writing 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]
By such an operation, a signal recording operation to the disk 1 is performed, but a signal writing operation to the buffer RAM 10 is performed in accordance with a signal reading operation from the buffer RAM 10. . When the recording operation is normally performed, the address indicating the position, that is, the final address is stored in the memory circuit provided in the system control circuit 8 every time the signal recording operation to the disk 1 is performed. The operation to be performed.
[0026]
When the signal recording operation to the disk 1 is interrupted, the signal reading operation from the buffer RAM 10 is interrupted. In this case, the signal writing operation to the buffer RAM 10 is also interrupted. It is configured to let you. When an operation for starting a signal recording operation on the disk 1 is performed from such a state, after the optical pickup 2 is displaced to a position where the recording operation is started, that is, a position retracted from a position where the recording operation is interrupted, Playback operation is performed from that position. The position where the recording is interrupted can be easily recognized from the final address stored in the memory circuit every time the normal recording operation is performed, and the optical pickup 2 can be moved to a desired position.
[0027]
The signal reproduced by such a reproducing operation is a signal recorded immediately before the recording operation is interrupted, and a comparison operation between the signal and the signal stored in the buffer RAM 10 is performed. When it is determined by the comparison operation that both signals are the same signal, reading of the signal stored in the buffer RAM 10 and subsequent to the signal subjected to the comparison operation described above is read. As the operation is performed, the signal is input to the signal recording circuit 9 to start the signal recording operation on the disk 1. By the above-described operation, it is possible to perform a recording interruption operation and a recording resumption operation of the signal on the disk 1, and by performing such an operation, the disk 1 continuously receives a signal despite the interruption of the recording operation. Recording operation, so-called seamless recording operation can be performed.
[0028]
As described above, the recording operation in the present embodiment is performed. When the signal recording operation is completed, the recording operation of the recording information data indicating the recording position of the signal recorded on the disc to the lead-in area of the disc 1 is performed. Is done. The recording operation of recording information data in the lead-in area is performed at a speed at which a signal is recorded on the disk 1.
[0029]
As described above, the signal recording operation in this embodiment is performed. Next, the setting of the laser output will be described. The laser output setting operation is performed based on the recording command signal output from the computer device 7. The laser output setting operation is performed by applying a test signal to the test writing area provided on the inner peripheral side of the disk 1. This is performed while changing the output, the recorded signal is reproduced, and the racer output corresponding to the signal reproduced as the optimum signal is set as the optimum laser output. For such a laser output setting method, a well-known technique may be used, and details thereof are omitted.
[0030]
The laser output setting operation is performed as described above. Next, the gist of the present invention will be described based on the flowchart shown in FIG. The laser output setting operation is started based on a recording command signal output from the computer device 7. The recording speed is a laser suitable for the high-speed recording speed S that is the maximum speed provided in the optical disc recording / reproducing apparatus. This is done to set the output.
[0031]
Such laser output setting operation is performed in order to move the optical pickup 2 to the test writing area provided on the inner peripheral side of the disk 1 and to set the rotational speed of the spindle motor M to the high recording speed S in the test writing area. The control operation is performed (step A). When such a control operation is performed, an operation for determining whether or not the rotational speed of the disk 1 has increased to the high-speed recording speed S is performed (step B).
[0032]
In step B, if it is determined that the disk 1 is driven to rotate at the high recording speed S, the test signal is recorded while changing the laser output in the state of the rotational speed and recorded. The laser output P is set by performing a signal reproduction operation (step C). The laser output P set in this way is a laser output suitable for the high-speed recording speed S, and a recording operation is performed on the disk 1 that is rotationally driven at the high-speed recording speed S by the laser output P (step). D).
[0033]
The recording operation is performed when the rotational speed in the test writing area can be increased to the high speed recording speed S, but the operation when the rotational speed cannot be increased to the high speed recording speed S will be described next.
[0034]
If it is determined in step B that the disk 1 is not being rotated at the high recording speed S, the test signal recording operation at the rotation speed at that time, that is, the rotatable speed S1, is changed in laser output. And setting the laser output P1 by performing a reproduction operation of the recorded signal (step E). When the laser output P1 at the rotatable speed S1 is set in this manner, the rotatable speed S1 and the set laser output P1 are sent to a memory circuit (not shown) provided in the system control circuit 8 or the like. Store (step F).
[0035]
When the processing operation of step F is completed, the setting operation of the laser output PP is performed in a state where the rotational speed of the disk 1 is changed to a predetermined speed slower than the rotatable speed S1, for example, a predetermined low speed recording speed SS that is one step slower than the high speed recording speed S. (Step G). When such setting operation is completed, there is a specific relationship obtained in the experiment between the recording speed and the laser output, and therefore, based on the rotatable speed S1, the laser output P1, the low speed recording speed SS, and the laser output PP. Then, a laser output PK suitable for the high-speed recording speed S is calculated (step H).
[0036]
In this way, the laser output PP suitable for the low-speed recording speed SS and the laser output PK suitable for the high-speed recording speed S are set, but such data is stored in the memory circuit incorporated in the system control circuit 8. It is configured to be stored.
[0037]
When the processing operation of step H is completed, the signal recording operation is started. Prior to the start of the recording, a determination operation is performed as to whether or not the recording position can perform the rotational driving operation at the high recording speed S. (Step I). That is, in the trial writing area, even if the rotational speed of the disk 1 cannot be increased to the high recording speed S, the signal recording position is on the outer peripheral side of the trial writing area, so the rotational speed of the disk 1 is slow. Because. Since the rotation speed at the recording start position can be calculated from the position on the disk 1 based on the position information data recorded on the disk 1, the high-speed recording speed S is compared with the rotation speed S1 described above. It can be determined whether or not the rotational driving operation can be performed.
[0038]
If it is determined in step I that rotation is possible at the high recording speed S, the optical pickup 2 is moved to the recording position and a signal recording operation is performed at the high recording speed S with the laser output PK (step S1). J). In step I, if it is determined that the rotation cannot be performed at the high recording speed S, the optical pickup 2 is moved to the recording position and the signal recording operation is performed at the low recording speed SS by the laser output PP. (Step K).
[0039]
The recording operation at the low recording speed SS is started by the processing operation of step K, but the rotational speed of the disk decreases as the recording position moves to the outer peripheral side. In a state where such a recording operation is being performed, a determination operation is performed as to whether or not the recording position is a rotatable position at a high recording speed S (step L). If it is determined in step L that rotation is possible, the recording speed is changed to the high-speed recording speed S, and a signal recording operation is performed with the laser output PK (step M).
[0040]
Thus, the recording time can be shortened as much as possible by performing the operation of changing the recording speed from the low speed recording speed SS to the high speed recording speed S.
[0041]
In this embodiment, the low-speed recording speed SS is set to a speed that is one step slower than the high-speed recording speed S, but other recording speeds provided in the optical disc recording / reproducing apparatus can also be used.
[0042]
【The invention's effect】
The present invention records a signal on a disc at a prescribed speed and a plurality of high speeds set to different multiples with respect to the prescribed speed, and at the same time a test signal in a test writing area provided on the inner circumference side of the disc In the optical disk recording / reproducing apparatus configured to set the laser output for performing the recording operation by recording / reproducing the disk, the rotational speed of the disk is set to the high-speed recording speed at the time of setting the laser output at the high-speed recording speed. If it is not possible, the laser output is set according to the rotation speed at that time, and then the laser output is set at a predetermined low-speed recording speed slower than the rotation speed. High-speed recording speed based on the laser output set at the low-speed recording speed and the laser output set at the low-speed recording speed. Since to calculate the laser output corresponding to, it is possible to set the laser output suitable for high-speed recording rate even when unable at the trial writing area of the rotational speed of the disc at high speed recording speed.
[0043]
Further, according to the present invention, when the position where the recording operation is performed is a rotatable position at a high recording speed, the recording operation is performed at a high recording speed, so that the recording operation can be performed quickly.
[0044]
In the present invention, when the position where the recording operation is performed is a position where the rotation cannot be performed at the high speed recording speed, the recording operation is performed at the low speed recording speed. Absent.
[0045]
Further, according to the present invention, since the recording operation is performed at the high recording speed when the rotation can be performed at the high recording speed after the recording starts, the recording operation can be shortened as much as possible.
[Brief description of the drawings]
FIG. 1 is a flowchart for explaining the operation 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)

Record a signal on the disc at a predetermined speed and a plurality of high speeds set to different multiples with respect to the specified speed, and record and reproduce a test signal in a test writing area provided on the inner circumference side of the disc In the optical disk recording / reproducing apparatus configured to set the laser output for performing the recording operation, when the rotation speed of the disk cannot be set to the high speed recording speed at the time of setting the laser output at the high speed The laser output is set according to the rotation speed at that time, and then the laser output is set at a predetermined low-speed recording speed slower than the rotation speed, and the rotation speed is set at the rotation speed. Corresponding to the high-speed recording speed based on the laser output, the low-speed recording speed and the laser output set at the low-speed recording speed. Optical disc recording and reproducing apparatus being characterized in that to calculate the laser output. 2. The optical disc recording / reproducing apparatus according to claim 1, wherein when the position where the recording operation is performed is a rotatable position at a high recording speed, the recording operation is performed at a high recording speed. 2. The optical disc recording / reproducing apparatus according to claim 1, wherein when the position where the recording operation is performed is a position where the rotation cannot be performed at a high recording speed, the recording operation is performed at a low recording speed. 4. The optical disc recording / reproducing apparatus according to claim 3, wherein a recording operation is performed at a high recording speed when the recording apparatus can rotate at a high recording speed after the start of recording.

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