JPH11265543A - Recording and/or reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform focus servo even when surface wobbling occurs in a disk. SOLUTION: A focus error signal is detected by a pickup device 2, and focus servo is performed by supplying this focus error signal to a pickup driving circuit 5. Also, a synchronous signal separated from a reproducing signal is supplied to, for instance, a processing circuit 10 for performing constant linear speed (CLV) control. A signal from this CLV processing circuit 10 is supplied through the contact (b) of a changeover switch 11 (SW1) to the driving circuit 12 of a spindle motor, and CLV driving control is performed for the spindle motor 13. Further, in parallel with the CLV processing circuit 10, for instance, a voltage generator 14 for normal rotation and a voltage generator 15 for low-speed rotation are provided. Voltage signals generated by these voltage generators 14 and 15 are supplied through the contacts (b) and (a) of a changeover switch 16 (SW2) to the contact (a) of the switch 11 (SW1).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is suitable for use in recording and / or reproducing optical recording disks such as high-density optical disks such as compact disks (CD) and digital video disks (DVD). It relates to a recording and / or reproducing device. More specifically, control for focusing a light beam for recording and / or reproducing on an optical recording disk is performed smoothly and satisfactorily.

[0002]

2. Description of the Related Art For example, a compact disc (CD),
Devices for recording and / or reproducing an optical recording disk such as a high-density optical disk such as a digital video disk (DVD) have been considered. That is, for example, a compact disc (CD) and a digital video disc (DV)
In the case of high-density optical discs such as D), the appearance of these discs is similar, and it is possible to design an apparatus having a common drive mechanism for these discs.

[0003]

In such a recording and / or reproducing apparatus for an optical recording disk, for example, when recording and / or reproducing on an optical recording disk, an optical disk for recording and / or reproducing is used. Focus servo (focus control) that moves the beam focus perpendicular to the optical recording disk, detects the position where the beam is focused, and keeps the light beam focused on the recording surface of the optical recording disk at all times ) Has been done.

However, in such a recording and / or reproducing apparatus, a so-called surface wobbling phenomenon occurs in which the position of the recording surface of the optical recording disk fluctuates in the vertical direction due to, for example, deformation or mounting error of the optical recording disk. Sometimes. And when such surface runout phenomenon occurs,
Since the position of the recording surface fluctuates in the vertical direction, it is extremely difficult to perform the above-described focus servo (focus control).

On the other hand, in the conventional apparatus, focus servo (focus control) is executed while the rotation of the optical recording disk is stopped, and after the focus servo is executed, the rotation of the optical recording disk is stopped. Means to get started have been used.

However, in an apparatus in which various optical recording disks can be commonly recorded and / or reproduced by using a common drive mechanism or the like, for example, the above-mentioned compact disk (CD) or digital video disk (DV)
Similarly to a high-density optical disk such as D), a so-called writable disk (rewritable disk: CD-
R, DVD-R) may be mounted.

In this case, for example, when the above-mentioned writable rewritable disks (CD-R, DVD-R) are stopped from rotating and a light beam of an incorrect wavelength is irradiated, the recorded data is recorded on these disks. Data may be destroyed.

That is, for example, a compact disc (C
When a light beam for reproduction (D) (for example, a wavelength of 780 nm) is irradiated onto a rewritable disc (DVD-R), data recorded on the disc may be destroyed. In addition, a light beam (for example, a wavelength of 650 nm) for reproducing a digital video disk (DVD) is applied to a rewritable disk (C).
Irradiating (D-R) may destroy data recorded on the disc.

In order to cope with such an obstacle, for example, a method of discriminating the type of the disc in advance so as not to irradiate a light beam having an incorrect wavelength is considered. However, discriminating the type of such a disc requires, for example, a special light detecting means and a circuit, and the precision is also required to be extremely high. It was not easy to implement.

Further, for example, in a state where the disk is being rotated, since the heat generated by the irradiated light beam is diffused, no trouble such as destruction of the data recorded on the disk occurs. However, in the case where the above-mentioned disk runout phenomenon occurs, the essential focus servo (focus control) itself becomes extremely difficult.

The present invention has been made in view of the above points, and the problem to be solved is that in the conventional apparatus, focus servo (focus control) is performed when a disk surface wobble phenomenon occurs. Is extremely difficult, and if the focus servo is executed in a state where the rotation of the disk is stopped, for example, a failure such as destruction of recorded data may occur.

[0012]

Therefore, in the present invention, the light beam is focused while the disk is rotated at a low speed, and then the disk is rotated at a predetermined speed. Therefore, according to this, there is no possibility that heat is diffused and recorded data is destroyed,
In addition, since the rotation of the disk is slow, the focus servo (focus control) can be performed even when the disk runout phenomenon occurs.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to a recording and / or reproducing apparatus for an optical recording disk, comprising: a rotation control means for controlling the rotation of the optical recording disk; and a recording and / or reproducing apparatus for the optical recording disk. A pickup device for generating a light beam for reproduction; and a focus control means for controlling a focus of the light beam on a recording surface of the optical recording disk. After the light beam for recording and / or reproducing the disk is focused, the rotation of the optical recording disk is set at a predetermined speed.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram showing a configuration of an example of a recording and / or reproducing apparatus to which the present invention is applied.

In FIG. 1, an optical recording disk (hereinafter, referred to as an optical disk) 1 such as a high-density optical disk such as a compact disk (CD) or a digital video disk (DVD) is provided. Further, an optical pickup device 2 is provided, and a light (laser) beam 3 from the pickup device 2 is applied to the recording surface of the optical disc 1, and the reflected light is detected by the pickup device 2.

Therefore, the pickup device 2 detects an error signal (focus error signal) when the light beam 3 is focused on the recording surface of the optical disk 1, for example.
This focus error signal is supplied to the focus adjustment circuit 4. Then, the control signal generated by the focus adjustment circuit 4 is supplied to the pickup drive circuit 5, whereby the focus servo of the pickup device 2 is performed.

An RF processing circuit 6 for recording and reproducing data on the optical disk 1 via the pickup device 2
And a modulation / demodulation circuit 7. And these RF
Through the processing circuit 6, the modulation / demodulation circuit 7, and the signal processing circuit 8, signals such as video signals, audio signals, and information signals recorded and reproduced on the optical disk 1 are input and output between the pickup device 2 and the outside. .

Further, for example, a signal reproduced by the pickup device 2 is supplied to a synchronization separation circuit 9 through a modulation / demodulation circuit 7, and the separated synchronization signal is output at a constant linear velocity (C
(LV) control. Then, the signal from the CLV processing circuit 10 is switched by the changeover switch 1
1 (SW1) is supplied to the drive circuit 12 of the spindle motor through the contact b, and the CLV drive of the spindle motor 13 is controlled.

In this way, the optical disk 1 is rotated by, for example, a predetermined CLV drive, and the pickup device 2
Recording and / or reproduction of signals such as an arbitrary video signal, audio signal, and information signal by controlling the light beam 3 from the optical disc 3 so as to focus on a desired track on a recording surface of the optical disc 1. Has been done.

Further, in this apparatus, for example, a voltage generator 1 for steady rotation is provided in parallel with the above-mentioned CLV processing circuit 10.
4 and a voltage generator 15 for low-speed rotation. The voltage signals generated by these voltage generators 14 and 15 are applied to the contact a of the switch 11 (SW1) through the contacts b and a of the changeover switch 16 (SW2), respectively.
Supplied to

In this apparatus, for example, the operation at the time of starting the optical disk 1 is performed as shown in the flowchart of FIG. That is, in FIG. 2, when the operation is started, first, in step [1], the switches 11, 1
6 are switched to the contact a, and the optical disk 1 is rotated at a low speed determined by the voltage of the voltage generator 15. Next, in step [2], the type of the optical disk 1 and the presence or absence of the disk are determined.

The type of the optical disc 1 is determined by
For example, the inventor of the present application has proposed (Japanese Patent Application No. 10-52201).
) Can be performed using the recording medium determination method described above.
That is, in the invention of the earlier application, the recording medium is irradiated with a light beam to gradually change its focus, and the level of a tracking error signal indicating that the light beam has crossed the track is measured to determine the type of the recording medium. It is something to do.

Further, in step [3], the presence or absence of the optical disk 1 is determined, and when the optical disk 1 is not mounted, the operation is ended (end). When the optical disk 1 is loaded, the focus servo is turned on in step [4]. In step [5], the switch 11 is switched to the contact a and the switch 16 is switched to the contact b. Thereby, the optical disk 1 is rotated at a predetermined speed determined by the voltage of the voltage generator 14, for example.

In this state, the tilt servo is turned on in step [6]. In step [7], the tracking offset is adjusted, and in step [8], the tracking servo is turned on. Further steps

In [9], the switch 11 is switched to the contact point b, and the above-described CLV drive servo is turned on. Then, in step [10], C
It is determined whether or not the LV servo has locked.

When the CLV servo is locked in step [10], the thread servo is turned on in step [11]. In step [12], adaptive servo adjustment is performed.
Is, for example, a digital video disk (DVD).

If the loaded optical disk 1 is, for example, a digital video disk (DVD), the control data is read in step [14], and the operation is ended (end). If the disc is not a digital video disc (DVD), TOC (table of contents) data is read in step [15], and the operation is terminated.

That is, in this apparatus, when the optical disk 1 is started, for example, as shown in FIG. 3, for example, the optical disk 1 is first rotated at an arbitrary low speed, the type of the disk is determined in this state, and the focus servo is turned on. You. If it is determined that the focus servo is good, the optical disc 1 is rotated at a steady speed, and the tracking servo is turned on.

Therefore, in this apparatus, the light beam is focused while the disk is rotated at a low speed, and then the disk is rotated at a predetermined speed, whereby heat is diffused and recorded data is destroyed. In addition, since the disk is rotated at a low speed, the focus servo (focus control) can be performed even when the surface runout phenomenon occurs.

As a result, in the conventional apparatus, focus servo (focus control) becomes extremely difficult when the disk runout phenomenon occurs. For example, when the focus servo is executed in a state where the rotation of the disk is stopped, recording is performed. According to the present invention, it is possible to easily solve those problems which may cause a failure such as data corruption.

Further, the above description has been made at the time of starting the optical disc 1. For example, when the focus servo becomes defective while the optical disc 1 is rotating, for example, as shown in the flowchart of FIG. Recovery is achieved. That is, in FIG. 4, when the operation is started, various servos are first turned off in step [21].

Next, in step [22], the focus servo is turned on. Further, the state of the focus servo is determined in step [23]. If the focus servo is not good, it is determined in step [24] whether or not the rotation of the optical disk 1 is low. If the speed is already low, the focus servo is set to an error state in step [25], and the operation is ended (end).

If the rotation of the optical disk 1 is not at low speed in step [24], both the switches 11 and 16 are switched to the contact a in step [26], and the optical disk 1 is driven at low speed determined by the voltage of the voltage generator 15. Rotated by Steps [22] and [23] are executed in this state,
If it is determined in step [23] that the focus servo is good, the process proceeds to step [27].

In step [27], the optical disk 1
It is determined whether or not the rotation speed is low. When the rotation speed is low, the switch 11 is switched to the contact a and the switch 16 is switched to the contact b in step [28]. Thereby, the optical disk 1 is rotated at a predetermined speed determined by the voltage of the voltage generator 14, for example. Then, in this state, the tracking servo is turned on in step [29].

Further, in step [30], the switch 11 is switched to the contact "b", and the servo of the CLV drive is turned on. Then, it is determined whether or not the CLV servo is locked in step [31]. When the CLV servo is locked, the thread servo is turned on in step [32], and the operation is ended (end).

When the focus servo becomes defective during the rotation of the optical disc 1, the focus servo is turned on after various servos are turned off, for example, as shown in FIG. If the focus servo is defective, the optical disc 1 is rotated at an arbitrary low speed, and the focus servo is turned on in this state. When the focus servo becomes good, the optical disc 1 is rotated at a steady speed and the tracking servo is turned on.

Therefore, in this operation as well, the focus servo is made to focus the light beam while the defective disk is once rotated at a low speed, and then the disk is rotated at a predetermined speed, thereby generating heat. The focus servo (focus control) can be performed even when there is no risk of destroying the data recorded by diffusion and the surface rotation phenomenon occurs because the rotation of the disk is slow.

Further, in the above-mentioned apparatus, when the optical recording disk is started, first, the rotation of the optical recording disk is set to a predetermined speed, and the focus of the light beam for recording and / or reproducing the optical recording disk is first set. If not, the above-described operation may be performed with the rotation of the optical recording disk being reduced in speed. As a result, the startup in a normal state can be accelerated.

In the above-described apparatus, the fact that the light beam for recording and / or reproduction on the optical recording disk could not be focused is stored. The above operation can also be performed with the recording disk rotating at a low speed. As a result, the start-up for a defect caused by a disk can be accelerated.

Further, in the above-described apparatus, even when the focus servo becomes defective during rotation of the optical recording disk, the rotation of the optical recording disk is first set to a predetermined speed, and the recording of the optical recording disk is performed. When the focus of the light beam to be reproduced and / or reproduced cannot be adjusted, the above-described operation is performed with the rotation speed of the optical recording disk reduced. This can speed up processing in a normal state.

Also, in the above-mentioned apparatus, even when the focus servo becomes defective during rotation of the optical recording disk, the light beam for recording and / or reproducing the optical recording disk could not be focused. Then, if a failure occurs during rotation of the same optical recording disk, the rotation of the optical recording disk is immediately performed at a low speed to perform the above operation. This makes it possible to speed up processing for a defect caused by a disk.

Further, in the above-described apparatus, when the optical recording disk is started, first, the rotation of the optical recording disk is set to a predetermined speed, and the focus of the light beam for recording and / or reproducing the optical recording disk is set here. If not, the above operation is performed with the optical recording disk rotating at a low speed.If the focus servo becomes defective while the optical recording disk is rotating, the operation at startup is determined. By determining whether or not to rotate the optical recording disk at a low speed, it is possible to speed up processing for a defect caused by the disk.

Thus, according to the recording and / or reproducing apparatus described above, it is a recording and / or reproducing apparatus for an optical recording disk, comprising: a rotation control means for controlling the rotation of the optical recording disk; A pickup device for generating a light beam for performing recording and / or reproduction; and a focus control unit for controlling the focus of the light beam on the recording surface of the optical recording disk, so that the rotation of the optical recording disk is reduced. By setting the rotation of the optical recording disk to a predetermined speed after focusing the light beam for recording and / or reproducing the optical recording disk, heat may be diffused and the recorded data may be destroyed. Also, since the rotation of the disk is slow, the focus servo (focus control) can be performed even when the disk runout phenomenon occurs. It is.

The present invention is not limited to the above-described embodiment, but can be variously modified without departing from the spirit of the present invention.

[0044]

According to the first aspect of the present invention, the light beam is focused while the disk is rotated at a low speed, and then the disk is rotated at a predetermined speed, whereby heat is diffused. The focus servo (focus control) can be performed even when there is no risk of destroying the recorded data and the surface rotation phenomenon occurs because the rotation of the disk is low.

As a result, in the conventional apparatus, it is extremely difficult to perform focus servo (focus control) when a disk runout phenomenon occurs. For example, when the focus servo is executed with the rotation of the disk stopped, recording is performed. According to the present invention, it is possible to easily solve those problems which may cause a failure such as data corruption.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an example of a recording and / or reproducing apparatus to which the present invention is applied.

FIG. 2 is a flowchart for explaining the operation.

FIG. 3 is a diagram for explaining this.

FIG. 4 is a flowchart for explaining another operation.

FIG. 5 is a diagram for explaining this.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Optical disk, 2 ... Pickup device, 3 ... Light beam, 4 ... Focus adjustment circuit, 5 ... Pickup drive circuit, 6 ... RF processing circuit, 7 ... Modulation / demodulation circuit, 8 ... Signal processing circuit, 9 ... Synchronization separation circuit 10, CLV processing circuit,
11, 16: changeover switch, 12: drive circuit of spindle motor, 13: spindle motor, 14: voltage generator for steady rotation, 15: voltage generator for low speed rotation

Claims (8)

[Claims] 1. A recording and / or reproducing apparatus for an optical recording disk, comprising: a rotation control means for controlling rotation of the optical recording disk; and a light beam for recording and / or reproducing the optical recording disk. And a focus control means for controlling the focus of the light beam to the recording surface of the optical recording disk, and the optical recording disk being rotated at a low speed. A recording and / or reproducing apparatus characterized in that the optical recording disk is rotated at a predetermined speed after a light beam for recording and / or reproducing is focused. 2. The recording and / or reproducing apparatus according to claim 1, wherein at the time of starting the optical recording disk, the rotation of the optical recording disk is previously set to a low speed, and the recording and / or reproducing of the optical recording disk is performed. A recording and / or reproducing apparatus, wherein the optical recording disk is rotated at a predetermined speed after the light beam is focused. 3. The recording and / or reproducing apparatus according to claim 1, wherein when the optical recording disk is started, the rotation of the optical recording disk is first set to a predetermined speed, and the recording and / or reproducing of the optical recording disk is performed. And / or when the light beam to be reproduced cannot be focused, the rotation of the optical recording disk is reduced to a low speed and the light beam to be recorded and / or reproduced from the optical recording disk is focused. A recording and / or reproducing apparatus, wherein the rotation of an optical recording disk is set to a predetermined speed. 4. The recording and / or reproducing apparatus according to claim 3, wherein information that a light beam for performing recording and / or reproduction on the optical recording disk could not be focused is stored, and then the same optical system is used. When starting up the optical recording disk, the rotation of the optical recording disk is set in advance and the rotation of the optical recording disk is adjusted after focusing the light beam for recording and / or reproducing on the optical recording disk. A recording and / or reproducing apparatus having a predetermined speed. 5. The recording and / or reproducing apparatus according to claim 1, wherein a light beam for recording and / or reproducing the optical recording disk cannot be focused during rotation of the optical recording disk. Is characterized in that the rotation of the optical recording disk is returned to a predetermined speed after the rotation of the optical recording disk is set to a low speed and a light beam for recording and / or reproducing the optical recording disk is focused. Recording and / or reproducing apparatus. 6. The recording and / or reproducing apparatus according to claim 1, wherein a light beam for recording and / or reproducing the optical recording disk cannot be focused during rotation of the optical recording disk. Controlling the focus of the light beam on the recording surface of the optical recording disk by first setting the rotation of the optical recording disk to a predetermined speed, and controlling the recording and / or reproducing of the optical recording disk. When the beam cannot be focused, the rotation of the optical recording disk is reduced, and the rotation of the optical recording disk is performed after focusing the light beam for recording and / or reproducing the optical recording disk. At a predetermined speed. 7. The recording and / or reproducing apparatus according to claim 6, wherein information that a light beam for performing recording and / or reproduction on the optical recording disk could not be focused is stored, and then the same optical system is used. When the light beam for recording and / or reproducing on the optical recording disk cannot be focused during rotation of the optical recording disk, the rotation of the optical recording disk is immediately reduced to a low speed, and the rotation of the optical recording disk is stopped. A recording and / or reproducing apparatus characterized in that the optical recording disc is rotated at a predetermined speed after focusing a light beam for recording and / or reproducing. 8. The recording and / or reproducing apparatus according to claim 1, wherein at the time of starting the optical recording disk, the rotation of the optical recording disk is first set to a predetermined speed, and the recording and / or reproducing of the optical recording disk is performed. And / or when the light beam to be reproduced cannot be focused, the rotation of the optical recording disk is reduced to a low speed and the light beam to be recorded and / or reproduced from the optical recording disk is focused. When the rotation of the optical recording disk is set to a predetermined speed and the optical beam for recording and / or reproducing the optical recording disk cannot be focused during the rotation of the optical recording disk, The operation at the time of starting the optical recording disk is determined, and the rotation of the optical recording disk is reduced to a low speed, and the recording and / or A recording and / or reproducing apparatus, comprising: determining whether or not to rotate the optical recording disk at a predetermined speed after focusing a light beam to be reproduced.