JPH06251402A - Optical disk driving device - Google Patents

Abstract

PURPOSE:To execute a tracking control on either area by detecting a boundary between an exclusive area for reproduction and a recording/reproducing area on an optical disk and switching the polarity of a tracking signal in accordance with the boundary detection signal. CONSTITUTION:A light emitting diode is provided on an optical pickup 3 moving along a guide shaft by means of a thread motor 10 and the feeding position of the pickup 3 is detected by means of a position sensitive element receiving the light from the light emitting diode. A position detection signal obtained by the position sensitive element is supplied to a system controller 9. The controller 9 calculates the physical position of a boundary by means of a cluster address designating the boundary area between an exclusive area for reproduction and a recording/reproducing area and given as TOC data, detects the boundary position based on the position detecting signal, gives a switching control signal to the operational amplifier having switching functions in a polarity switching circuit for a tracking signal and executes the switching control of a tracking servo.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk drive device for driving an optical disk having a read-only area and a recording / playback area in which the polarities of tracking signals are different.

[0002]

2. Description of the Related Art An optical disk can have a recording capacity larger than that of a magnetic disk by about 2 to 3 digits and can be accessed at a higher speed than a tape-shaped recording medium. In addition, since data can be recorded / reproduced in a non-contact manner with respect to the medium and the durability is excellent, it has been widely used in recent years.

The optical disk is a read-only optical disk according to a standard CD format (CD-DA format) having a read-only area in which data is recorded as pits, and data recording / reproducing is possible, for example, a magneto-optical recording medium. C having a recording / reproducing area formed by
CD as an extended format of D-DA format
An optical disc according to the MO format, an optical disc having both a read-only area in which data is recorded as pits and a recording / reproducing area in which data can be recorded and reproduced are known.

Then, in the reproduction system of the reproduction-only optical disk, a tracking signal is extracted from the reproduction output by the optical pickup which optically scans the pit train recorded in the reproduction-only area of the optical disk, and this tracking signal is obtained. Accordingly, tracking control of the optical pickup is performed.

In a recording / reproducing system of an optical disk having a recording / reproducing area capable of recording / reproducing data, for example, from a reproduction output by an optical pickup which optically scans a recording track formed along a groove (guide groove), A tracking signal based on the groove is extracted, and tracking control of the optical pickup is performed according to the tracking signal.

[0006]

By the way, in an optical disc having both a read-only area in which data is recorded as a pit and a recording / reproducing area in which data can be recorded / reproduced, 3
The polarity of the tracking signal obtained from the reproduction output by the optical pickup by the beam method or the like may be inverted between the reproduction-only area and the recording / reproduction area.

As described above, in the optical disc in which the polarities of the tracking signals are inverted between the reproduction-only area and the recording / reproduction area, it becomes impossible to perform tracking control based on the tracking signal obtained from the reproduction output by the optical pickup. .

In view of the conventional problems as described above, the present invention provides an optical disk drive apparatus for driving an optical disk having a read-only area and a recording / playback area in which the polarities of tracking signals are different, and the read-only area of the optical disk. It is an object of the present invention to provide an optical disk drive device capable of normally performing tracking control of an optical pickup in either of the recording / reproducing area.

[0009]

In order to solve the above problems, an optical disk drive apparatus according to the present invention is an optical disk drive apparatus for driving an optical disk having a read-only area and a recording / playback area in which the polarities of tracking signals are different. The tracking control means for performing tracking control based on the tracking signal obtained from the optical disc by the optical pickup, the boundary detection means for detecting the boundary between the reproduction-only area and the recording / reproduction area, and the boundary detection means. Polarity switching control means for switching the polarity of the tracking signal according to the boundary detection signal is provided.

In the optical disk drive device according to the present invention, the boundary detecting means records the reproduction-only area on the basis of a position detection signal by the position detecting means for detecting the radial feed position of the optical pickup with respect to the optical disk. It is characterized in that the boundary with the reproduction area is detected.

Further, in the optical disk drive device according to the present invention, the boundary detecting means includes a position detecting means for optically detecting a feed position of the optical pickup.

Further, in the optical disk drive apparatus according to the present invention, a wobbling signal for rotationally driving the optical disk at a constant linear velocity is recorded by causing the groove formed along the recording track of the recording / reproducing area to meander. The boundary detecting means detects the boundary between the reproduction-only area and the recording / reproducing area based on the presence or absence of a wobbling signal included in the reproduction output from the optical pickup.

[0013]

In the optical disk drive device according to the present invention, when driving the optical disk in which the polarities of the tracking signals are different between the read-only area and the recording / playback area, the boundary detection means divides the read-only area and the read / write area on the optical disk. The boundary is detected, and the polarity switching control means switches the polarity of the tracking signal obtained from the optical disc by the optical pickup in accordance with the boundary detection signal from the boundary detecting means.

Further, in the optical disk drive apparatus according to the present invention, the boundary detection means determines the reproduction-only area based on the position detection signal by the position detection means for detecting the radial feed position of the optical pickup with respect to the optical disk. The boundary with the recording / playback area is detected.

Further, in the optical disk drive apparatus according to the present invention, the boundary detecting means causes the reproduction-only area and the recording / reproducing area to be performed based on the position detection signal by the position detecting means for optically detecting the feed position of the optical pickup. Detect the boundary between and.

Further, in the optical disk drive device according to the present invention, the boundary between the reproduction-only area and the recording / reproduction area is detected by the boundary detection means based on the presence or absence of the wobbling signal included in the reproduction output by the optical pickup.

[0017]

Embodiments of the disk drive device according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram showing the schematic arrangement of an optical disc recording / reproducing apparatus to which the disc driving apparatus according to the present invention is applied.

The optical disk recording / reproducing apparatus shown in FIG. 1 records / reproduces data on / from a magneto-optical disk 2 rotatably driven by a spindle motor 1 at a constant linear velocity. magneto-optical disc 2 and a recording and reproduction area a ₂₀ provided outside the read-only area a ₁₀ Toko playback only area a ₁₀ is adapted to be rotated at a constant linear velocity by the spindle motor 1 so There is.

Read-only area A ₁₀ of the magneto-optical disk 2
Has a data area A ₁₁ in which program data such as performance information is recorded, and a lead-in area A ₁₂ provided on the inner peripheral side thereof. In this reproduction-only area A ₁₀ , digital data is recorded in advance as presence / absence of pits corresponding to “1” and “0”. In the lead-in area A ₁₂ , as recording (TOC: Table of Contents) data indicating the recording position and recording contents of the data area A ₁₁ , recording start address information and recording end address are sequentially set for all program data. Information is recorded.

The recording / reproducing area A ₂₀ of the magneto-optical disk 2 has a data area A _{21 in} which program data such as performance information is recorded and a lead-in area A ₂₂ provided on the inner peripheral side thereof. is doing. This recording / reproducing area A ₂₀ is a magneto-optical recording medium area. A recording track is formed along the groove (tracking guide groove) in the recording / reproducing area A ₂₀ of the magneto-optical disk 2. Further, by wobbling the groove, a wobbling signal is obtained. The CLV control sine wave signal is recorded, and the address information is superimposed by performing frequency modulation on the CLV control sine wave signal. In the lead-in area A ₂₂ , track number information indicating a series of data recorded in each data area is provided as TOC data indicating a recording position and recording content of the data recorded in the data area A ₂₁ . Address information indicating the position of each data area is recorded.

The optical disk recording / reproducing apparatus of this embodiment responds to data in a state in which the magneto-optical disk 2 rotated by the spindle motor 1 at a constant linear velocity is irradiated with laser light from the optical pickup 3, for example. By applying a modulating magnetic field by the magnetic head 4,
Data recording (so-called magnetic field modulation recording) along the recording track of the recording / reproducing area A ₂₀ of the magneto-optical disk 2.
And the reproduction-only area A ₁₀ of the magneto-optical disk 2
And the recording track of the recording / reproducing area A ₂₀ is traced with the laser light by the optical pickup 3,
The magnetic head 4 is used for optically reproducing data.
A magnetic head drive circuit 5 for driving the optical pickup, an RF circuit 6 to which a reproduction output obtained by the optical pickup 3 is supplied,
A system controller 9 that includes an address decoder 7 and a servo control circuit 8 and controls the entire system, a sled motor 10 that moves the optical pickup 3 and the magnetic head 4, and an encoder / decoder that performs conversion processing corresponding to a disk format. 11, an AD / DA converter 12 for inputting and outputting an audio signal,
A compression / decompression processing unit 13 for compressing / decompressing audio data, a buffer memory 14 for temporarily storing audio data, a buffer memory 15 for inputting / outputting computer data, and an error correction process for computer data The encoder / decoder 16 of FIG.

When recording data in the recording / reproducing area A ₂₀ of the magneto-optical disk 2, the optical pickup 3 drives the magnetic head 4 by a head drive circuit 5 to apply a modulation magnetic field according to the recording data. Data recording is performed by thermomagnetic recording by irradiating the target track of the magneto-optical disc 2 with laser light. Also,
The optical pickup 3 detects a focus error by a so-called astigmatism method and a tracking error by a three-beam method by detecting the reflected light of the laser light applied to the target track. Further, when reproducing data from the reproduction-only area A ₁₀ of the magneto-optical disk 2, the optical pickup 3 outputs a reproduction signal obtained by detecting a change in the amount of laser light reflected from the target track. . When reproducing data from the recording / reproducing area A ₂₀ of the magneto-optical disk 2, a reproduction signal obtained by detecting the difference in polarization angle (Kerr rotation angle) of the reflected light of the laser light from the target track is output. To do.

The output of the optical pickup 3 is supplied to the RF circuit 6 as shown in FIG. This RF circuit 6
The focus error signal and the tracking error signal are extracted from the output of the optical pickup 3 and supplied to the servo control circuit 6, and the reproduction signal is binarized and supplied to the address decoder 6 and the encoder / decoder 7.

The servo control circuit 6 is composed of, for example, a focus servo control circuit, a tracking servo control circuit, a spindle motor servo control circuit, a sled servo control circuit, and the like. The focus servo control circuit controls the focus of the optical system of the optical pickup 3 so that the focus error signal becomes zero.
Further, the tracking servo control circuit controls the tracking of the optical system of the optical pickup 3 so that the tracking error signal becomes zero. Further, the spindle motor servo control circuit controls the spindle motor 1 so as to rotate and drive the magneto-optical disk 2 at a predetermined constant linear velocity. Further, the sled servo control circuit controls the sled motor 10 to move the optical pickup 3 and the magnetic head 4 to a target track position of the magneto-optical disk 2 designated by the system controller 9. The servo control circuit 8 that performs such various control operations supplies information indicating the operating state of each unit controlled by the servo control circuit 8 to the system controller 9.

The system controller 9 controls the operation in a key input operation section (not shown) or in a write mode or a read mode designated by control input information supplied from the external host side. The system controller 9 also records a recording position on the recording track traced by the optical pickup 3 and the magnetic head 4 based on address information in sector units reproduced from the recording track of the magneto-optical disk 2. Manage the playback position. The system controller 9 controls the read-in area A ₁₀ of the read-only area A ₁₀ of the magneto-optical disk 2.
_The TOC data read from ₁₂ is stored in the RAM ₁₁ , and the reproduction position of the data area A ₁₁ of the reproduction-only area A ₁₀ is managed based on this TOC data. further,
The system controller 7 includes the magneto-optical disk 2
The TOC data read from the lead-in area A ₂₂ of the recording / reproducing area A ₂₀ is stored in the RAM 11, and the recording position and the reproducing position of the recording / reproducing area A ₂₀ with respect to the data area A ₂₁ are managed based on the TOC data. To do.

Then, in the optical disk recording / reproducing apparatus of this embodiment, as shown in FIG.
A light emitting diode 21 is provided in the optical pickup 3 which is moved along the guide shaft 20 by means of a position detecting element (PS) for receiving light from the light emitting diode 21.
D) 22 optically detects the feed position of the optical pickup 3. This position detection element 2
The position detection signal indicating the feed position of the optical pickup 3 obtained by 2 is supplied to the system controller 9.

The system controller 9 calculates the physical position of the boundary by the cluster address indicating the boundary position between the read-only area A ₁₀ and the recording / reproducing area A ₂₀ given as TOC data, and outputs the position detection signal with the physical position. The boundary position is detected on the basis of the switching control signals RFSW0 and RFSW1 shown in Table 1 in the operational amplifiers 31 and 32 with the switching function of the tracking signal polarity switching circuit shown in FIG.
To control the polarity switching of the tracking servo.

[0029]

[Table 1]

In the tracking signal polarity switching circuit shown in FIG. 4, the detection outputs −E and −F of the side spots obtained by the optical pickup 3 are obtained by the operational amplifier 30.
Then, the difference is detected and converted into a tracking error signal EF. The tracking error signal EF is switched in polarity, gain, and frequency characteristic by the two operational amplifiers 31 and 32 with a switching function according to each region.

In the recording / reproducing area A ₂₀ , the tracking error signal E- obtained by the operational amplifier 30 is obtained.
F is output as it is through the operational amplifier 32 with the switching function. In the reproduction-only area A ₁₀ , the polarity of the tracking error signal EF obtained by the operational amplifier 30 is inverted by the operational amplifier 31 having the switching function, and the operational amplifier 32 having the switching function is used as the tracking error signal FE. Is output via. Note that the playback-only area A
_{In 10} , the gain and frequency characteristics are switched between the lead-in area and the data area.

In the optical disk recording / reproducing apparatus of this embodiment, the position detecting element (PSD) 22 optically detects the feed position of the optical pickup 3 to control the polarity switching of the tracking servo. The thread motor 10 of the optical pickup 3 is a stepping motor, and the system controller 9
Thus, the feed position of the optical pickup 3 can be detected by counting the step pulse applied to the stepping motor, and the polarity switching control of the tracking servo can be performed.

In the recording / reproducing area A ₂₀ of the magneto-optical disk 2, a CLV controlling sine wave signal is recorded as a wobbling signal in which the groove is meandered, so that it is included in the reproducing output of the optical pickup 3. It is also possible to detect the boundary between the read-only area A ₁₀ and the recording / playback area A ₂₀ of the magneto-optical disk 2 depending on the presence or absence of the wobbling signal.

The circuit for detecting the wobbling signal included in the reproduction output of the optical pickup 3 is, for example, as shown in FIG. 5, a narrow band filter 41 to which the push-pull signal of the main spot of the optical pickup 3 is supplied.
A detection circuit 42 to which the filter output of the narrow band filter 41 is supplied, a low-pass filter 43 to which the detection output of the detection circuit 42 is supplied, and a level comparator 44 to which the filter output of the low-pass filter 43 is supplied. Be prepared.

The narrow band filter 41 passes the frequency (22.05 kHz) component of the wobbling signal. The level comparator 44 compares the signal level of the detection output of the detection circuit 42 for detecting the wobbling signal extracted from the push-pull signal as the filter output of the narrow band filter 41 with a threshold level, and detects the detection circuit. When the signal level of the detection output by 42 is higher than the threshold level, the optical pickup 3
Thus, a detection signal indicating that the recording / reproducing area A ₂₀ is being scanned is supplied to the system controller 9 by a logic "1".

[0036]

As described above, in the disk drive device according to the present invention, when the optical disk having the read-only area and the recording / playback area in which the polarities of the tracking signals are different, the boundary detection means is used for the read-only area on the optical disk. The boundary between the area and the recording / reproducing area is detected, and the polarity of the tracking signal obtained by the optical pickup from the optical disk is switched by the polarity switching control means in accordance with the boundary detection signal from the boundary detecting means. The tracking control of the optical pickup can be normally performed in both the area and the recording / reproducing area.

Further, in the optical disk drive device according to the present invention, the boundary detection means determines the reproduction-only area based on the position detection signal by the position detection means for detecting the radial feed position of the optical pickup with respect to the optical disk. By detecting the boundary with the recording / reproducing area and switching the polarity of the tracking signal by the polarity switching control means, the tracking control of the optical pickup can be normally performed in both the read-only area and the recording / reproducing area of the optical disc. You can

Further, in the optical disk drive apparatus according to the present invention, the boundary detecting means causes the reproduction-only area and the recording / reproducing area to be performed based on the position detection signal by the position detecting means for optically detecting the feed position of the optical pickup. By detecting the boundary between the optical disc and the polarity and controlling the polarity of the tracking signal by the polarity switching control means, the tracking control of the optical pickup can be normally performed in both the read-only region and the recording / reproducing region of the optical disc.

Further, in the optical disk drive apparatus according to the present invention, the boundary between the reproduction-only area and the recording / reproduction area is detected by the boundary detection means based on the presence or absence of the wobbling signal included in the reproduction output by the optical pickup. ,
By switching the polarity of the tracking signal by the polarity switching control means, the tracking control of the optical pickup can be normally performed in both the read-only area and the recording / playback area of the optical disc.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an optical disc recording / reproducing device to which an optical disc driving device according to the present invention is applied.

FIG. 2 is a schematic plan view for explaining the structure of a magneto-optical disc used in the optical disc recording / reproducing apparatus.

FIG. 3 is a side view schematically showing a detection mechanism of a feed position of an optical pickup in the optical disc recording / reproducing apparatus.

FIG. 4 is a circuit diagram showing a configuration of a tracking signal polarity switching circuit in the optical disc recording / reproducing apparatus.

FIG. 5 is a block diagram showing a configuration of a wobble signal detection circuit applied to the optical disc recording / reproducing apparatus.

[Explanation of symbols]

 1 ... Spindle motor 2 ... Magneto-optical disk 3 ... Optical pickup 4 ... Magnetic head 5 ... ··· Magnetic head drive circuit 6 ··· RF circuit 7 ··· Address decoder 8 ··· Servo control circuit 9 ···・ System controller 10 ・ ・ ・ ・ ・ ・ Thread motor 11 ・ ・ ・ ・ ・ ・ Encoder / decoder 21 ・ ・ ・ ・ ・ ・ Light emitting diode 22 ・ ・ ・ ・ ・ ・ Position detection element 30・ ・ ・ ・ ・ ・ ・ ・ Amplifier 31, 32 ・ ・ ・ Amplifier with switching function 41 ・ ・ ・ ・ ・ ・ Narrow band filter 42 ・ ・ ・ ・ ・ ・ Detection circuit 43 ・ ・ ・・ ・ ・ ・ ・ Low-pass filter 44 ・ ・ ・ ・ ・ ・ ・ ・ Level comparator

Claims (4)

[Claims] 1. An optical disk drive device for driving an optical disk having a read-only area and a recording / playback area having different polarities of a tracking signal, wherein tracking control is performed based on a tracking signal obtained from the optical disk by an optical pickup. Control means, boundary detection means for detecting the boundary between the reproduction-only area and the recording / reproduction area, and polarity switching control means for switching the polarity of the tracking signal in accordance with the boundary detection signal by the boundary detection means. An optical disk drive device characterized by the above. 2. The boundary detecting means detects a boundary between the reproduction-only area and the recording / reproducing area based on a position detection signal from a position detecting means for detecting a radial feed position of the optical pickup with respect to the optical disc. The optical disk drive device according to claim 1, wherein: 3. The optical disk drive device according to claim 2, wherein the boundary detecting means includes position detecting means for optically detecting a feed position of the optical pickup. 4. A wobbling signal for rotationally driving the optical disk at a constant linear velocity is recorded by causing a groove formed along a recording track of the recording / reproducing area to meander. 2. The optical disk drive apparatus according to claim 1, wherein the boundary between the reproduction-only area and the recording / reproduction area is detected based on the presence or absence of a wobbling signal included in the reproduction output from the optical pickup.