JPH1064200A - Information reproduction device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to prevent malfunction of a PLL circuit at the time of reproduction of a head part or buffer part, etc., by selecting prescribed signals at the time of reproduction of a data non-recorded region and selecting the regenerative signal of the data reproduced in a reproducing means at the time of reproduction of a data recorded region. SOLUTION: The data regenerative signals which are outputted from a data reproducing circuit 18 and are binarized are inputted at all times to the PLL circuit 16a. The data regenerative signals outputted from the data reproducing circuit 18 are not outputted to the PLL circuit 16a but the master clock signal outputted from a master clock circuit 17 is outputted to the PLL circuit 1a at the time of reproduction of the gap part and the buffer part. The master clock signal is the signal of nearly the same frequency as the frequency of the reference clock signal formed in the PLL circuit 16. Even if noises or defects are binarized in the data reproducing circuit 18 by such processing, these are not outputted to the PLL circuit 16 in the final and the operation of the PLL circuit 16 is not affected at all.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an information reproducing apparatus for reproducing information recorded on an information recording medium.
In particular, the present invention relates to an optical disk device that reproduces information recorded on an optical disk as an information recording medium.

[0002]

2. Description of the Related Art In recent years, optical disk devices for reproducing data recorded on an optical disk as an information recording medium and recording data on the optical disk have been put to practical use. In an optical disk device, by rotating an optical disk at a constant speed and moving an optical head in a radial direction, reproduction of data recorded on a predetermined track and recording of data on a predetermined track are performed.

The optical disk handled by such an optical disk device has concentric or spiral tracks formed therein, and defines a sector area composed of an address area having a predetermined track length and a recording area. I have. Address data indicating a position on a track is recorded in the above-mentioned address area, so-called header section, and recording data is recorded in the above-mentioned recording area, so-called data section.

Further, a gap is provided between the end of the header and the end of the data, and a buffer is provided between the end of the data and the end of the next header. . The gap section and the buffer section are used to absorb a shift in the writing start timing at the time of recording data on the optical disc or an error due to uneven rotation speed of the optical disc.

Here, reproduction of data recorded on an optical disk will be briefly described. First, an optical disk is irradiated with a light beam. The reflected light of the irradiated light beam from the optical disk, that is, the reflected light reflecting the data recorded on the optical disk is detected. Next, in the data reproducing circuit, the detected detection signal is binarized, and the data recorded on the optical disk is reproduced. Furthermore, the reproduced signal output by this reproduction is
It is input to a PLL (phase-locked loop) circuit. PL
The reproduction signal input to the L circuit is compared in phase with a reference clock signal generated by the PLL circuit, and a reference clock signal synchronized with the reproduction signal is output.

[0006]

However, the following problems occur due to noise generated due to the above-mentioned scratches in the gap portion or the buffer portion. That is, noise generated due to scratches in the gap portion or the buffer portion, etc.
The data is binarized in the data reproducing circuit and input to the PLL circuit. Since the PLL circuit is in the enable state regardless of the gap section or the buffer section, it operates in synchronization with the noise binarized signal. As a result, PL
There has been a problem that the frequency of the synchronous clock output from the L circuit is out of order, the frequency cannot be completely drawn in the header or data section, and a reading error of data recorded in the header or data section occurs.

An object of the present invention has been made in view of the above circumstances, and provides an information reproducing apparatus capable of preventing a malfunction of a PLL circuit at the time of reproducing a header portion or a buffer portion. It is in.

[0008]

SUMMARY OF THE INVENTION The present invention has been made on the basis of the above-mentioned problems, and the present invention provides an information recording system comprising a data recording area in which data is recorded and a data non-recording area in which no data is recorded. In an information reproducing apparatus for reproducing a recording medium, reproducing means for reproducing data recorded on the information recording medium, and generating a reference clock signal serving as a reference when reproducing data recorded on the information recording medium, Synchronizing means for synchronizing this reference clock signal with a predetermined input signal and outputting the selected signal; and selecting a predetermined signal as an input signal to the synchronizing means at the time of reproducing the data non-recording area, and at the time of reproducing the data recording area. Input signal selecting means for selecting a reproduced signal of data reproduced by the reproducing means as an input signal to the synchronizing means.

According to the present invention, the information is recorded on an information recording medium including an address area for recording address data indicating a position on the information recording medium, a recording area for recording data for recording, and a margin area. In an information reproducing apparatus for reproducing data, a reproducing means for reproducing data recorded on an information recording medium and a reference clock signal serving as a reference when reproducing data recorded on the information recording medium are generated. Synchronization means for synchronizing a reference clock signal with a predetermined input signal and outputting the same; reference clock equivalent signal output means for generating and outputting a reference clock equivalent signal corresponding to the reference clock signal; and detecting a position of the margin area. During reproduction of the margin area, a reference signal output from the reference clock equivalent signal output means as an input signal to the synchronization means. Lock equivalent signal is selected, said when reproducing the address area and the recording area and an input signal selecting means for selecting the reproduced signal of the reproduced data by the reproducing means.

The present invention relates to an optical disk apparatus for reproducing an optical disk composed of a data recording area on which data is recorded and a data non-recording area on which no data is recorded, a reproducing means for reproducing data recorded on the optical disk. A synchronizing means for generating a reference clock signal serving as a reference when reproducing data recorded on the optical disk, synchronizing the reference clock signal with a predetermined input signal and outputting the same, and reproducing the data non-recording area. Input signal selection means for selecting a predetermined signal as an input signal to the synchronization means, and selecting a reproduction signal of data reproduced by the reproduction means as an input signal to the synchronization means during reproduction of the data recording area. Have.

The present invention reproduces data recorded on an optical disk, which comprises an address area in which address data indicating a position on the optical disk is recorded, a recording area in which recording data is recorded, and a margin area. In an optical disc device, a reproducing means for reproducing data recorded on an optical disc and a reference clock signal serving as a reference when reproducing data recorded on the optical disc are generated, and this reference clock signal is converted into a predetermined input signal. Synchronizing means for synchronizing and outputting; synchronizing signal output means for generating and outputting a reference clock equivalent signal corresponding to the reference clock signal; detecting a position of the margin area; A reference clock output from the reference clock equivalent signal output means as an input signal to the means. Select equivalent signal, during reproduction of the address regions and the recording area and an input signal selecting means for selecting the reproduced signal of the data reproduced by said reproducing means.

According to the present invention, there is provided an address area having concentric or spiral tracks on which data is recorded, having a predetermined track length and recording address data indicating a position on the track, and an address area for recording. A recording area where recording data is recorded, a first margin area provided between the end of this address area and the end of this recording area, and a space between the end of this recording area and the end of the next address area In an optical disc apparatus that reproduces data recorded on an optical disc whose format is defined so that a sector area constituted by a second margin area provided in the optical disc is continuous, the optical disc is irradiated with a light beam. Means for receiving reflected light of the light beam emitted from the irradiating means from the optical disk, and detecting the received reflected light. A detection signal output unit for outputting a signal; a reproduction signal output unit for outputting a reproduction signal of data recorded on the optical disk based on the detection signal output by the detection signal output unit; Synchronizing means for generating a reference clock signal serving as a reference when reproducing data stored therein, comparing the reference clock signal with a predetermined input signal, synchronizing the reference clock signal with the predetermined input signal, and outputting the same. Master clock signal output means for generating and outputting a master clock signal corresponding to the reference clock signal; and the first and second clock signals based on the address data included in the reproduction signal output from the reproduction signal output means. At the time of reproduction of the first and second margin areas, the position of the signal is used as an input signal to the synchronization means. A master clock signal output from the master clock signal output means is selected, and when the address area and the recording area are reproduced, the address area and the recording area output from the reproduction signal output means as input signals to the synchronization means are reproduced. Input signal selecting means for selecting a reproduction signal of the data in the area.

[0013] As a result of taking the above measures, the following effects occur. (1) In the information reproducing apparatus of the present invention, the synchronizing means (PLL
Reproduction means (data reproduction circuit) as an input signal to the circuit)
And a predetermined signal (master clock signal) is selected as an input signal to the synchronization means during reproduction of the data non-recording area (gap portion, buffer portion). Therefore, even if noise or the like is reproduced from the data non-recording area, the reproduced signal of the noise is not supplied to the synchronization means, a predetermined signal is supplied to the synchronization means instead, and the predetermined signal is supplied from the synchronization means. A reference clock signal synchronized with the signal is output. That is, even if noise or the like is reproduced from the data non-recording area, the synchronization means can be operated normally.

(2) In the optical disk device of the present invention, when reproducing the address area (header section) and the recording area (data section), the data is reproduced by the reproducing means (data reproducing circuit) as an input signal to the synchronizing means (PLL circuit). The reproduced signal is selected, and a master clock signal is selected as an input signal to the synchronization means during reproduction of the margin area (gap portion, buffer portion). Therefore, even if the noise or the like is reproduced from the margin area, the reproduced signal of the noise is not supplied to the synchronizing means. Instead, a master clock signal is supplied to the synchronizing means. A synchronized reference clock signal is output. That is, even if noise or the like is reproduced from the margin area, the synchronization means can operate normally.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram schematically showing a configuration of an information reproducing apparatus, that is, an optical disk apparatus according to an embodiment of the present invention.

This optical disk apparatus records data on an optical disk 1 as an information recording medium by using focused light,
Alternatively, the recorded data is reproduced. The optical disk device will be described later, and the optical disk 1 will be described first.

The optical disk 1 is formed by coating a metal film layer such as tellurium or bismuth in a donut shape on the surface of a circular substrate made of, for example, glass or plastics.

As shown in the example of the format of the optical disk in FIG. 2, the optical disk 1 has a plurality of zones including a plurality of tracks in a radial direction, for example, 19 zones 1a,
... divided into 1s. The frequency value of the clock signal for each zone 1a,..., 1s increases from the inner circumference to the outer circumference.

Each of the zones 1a,...
A sector 100 having a predetermined track length is defined. The number of the sectors 100 in each track decreases as approaching the inner diameter. The sector 100 includes a header section (address area) 102 and a data section (recording area) 1.
04 is defined. Address data indicating a position on a track is recorded in the header section 102, and recording data, so-called user data, etc., are recorded in the data section 104. Although FIG. 2 shows the outline of the format on the assumption that the tracks are concentric, the tracks may be spiral.

Further, as shown in the format example of each sector in FIG.
Gap portion (first margin area) 1
The buffer section 105 (second margin area) is provided between the end of the data section 104 and the tip of the header section 102. These gap portions 10
The reference numeral 3 and the buffer unit 105 are areas for margins for absorbing a deviation of a writing timing at the time of recording data on the optical disk or an error due to uneven rotation speed of the optical disk.

Here, the header section 102, the gap section 10
3, the data unit 104 and the buffer unit 105 will be described. In FIG. 3, it is assumed that one sector is composed of 1360 bytes. This one sector is composed of a header section 102, 14 as a 52-byte preformat area.
It is composed of a gap section 103 as a byte offset detection flag (ODF) area, a 1274-byte data section 104, and a 20-byte buffer section 105.

The header section 102 is an area for recording predetermined data when manufacturing an optical disk. The header section 102 includes a 5-byte sector mark SM, a 12-byte synchronization code section VFO1, an 8-byte synchronization code section VFO2, a 1-byte address mark AM, and a 5-byte address section ID1, ID2, and ID3. , 1
Each area of the byte postamble PA is constituted.

In the area of the sector mark SM, a special pattern indicating the start of a sector is recorded. In each area of the synchronization code section VFO, a continuous data pattern (synchronization code) for PLL lock is recorded. Address mark A
In the M area, a special pattern indicating the start of an address is recorded. In each area of the address part ID, a 2-byte track number, a 1-byte sector number, and a 2-byte error correction code (CRC) are recorded. The postamble PA is used when the error correction code of the address part ID does not fit in 2 bytes.

The gap portion includes a 1-byte offset detection flag ODF as a mark for offset detection in the tracking error detection using the push-pull method, a 3-byte gap GAP, and a 5-byte indicating that writing has been performed. FLAG, a 3-byte gap GAP, and a 2-byte auto laser power control ALPC.
The gap GAP is an unrecorded area.

The data part is a 12-byte synchronization code part V
FO3, a 3-byte data mark SYNC, and a 1259-byte data recording area. In the area of VFO3, a synchronization code for PLL lock is recorded. In the area of the data mark SYNC,
A special pattern indicating the start of the data section is recorded. The data section records user data and ECC (er
ror correction code), error correction code (CRC),
Data such as a special code for synchronization is recorded.

Returning to FIG. 1, the optical disk device will be described. The optical disk 1 is rotated at a constant speed, for example, by the motor 3. The motor 3 is controlled by a motor control circuit 4. Recording and reproduction of information on and from the optical disk 1 are performed by the optical head 5. The optical head 5 is fixed to a drive coil 7 constituting a movable portion of a linear motor 6, and the drive coil 7 is connected to a linear motor control circuit 8.

A speed detector 9 is connected to the linear motor control circuit 8, and sends a speed signal of the optical head 5 to the linear motor control circuit 8. Also,
The fixed portion of the linear motor 6 is provided with a permanent magnet (not shown).
As a result, the optical head 5 is moved in the radial direction of the optical disc 1.

An objective lens 10 is supported on the optical head 5 by a wire or a leaf spring (not shown).
The objective lens 10 is moved in a focusing direction (the optical axis direction of the lens) by a drive coil 11 and is movable in a tracking direction (a direction orthogonal to the optical axis of the lens) by the drive coil 12.

The semiconductor laser oscillator 9 is driven by the laser control circuit 13 to generate a laser beam. The laser control circuit 13 includes a modulation circuit 14 and a laser drive circuit 15, and operates in synchronization with a recording clock signal from the PLL circuit 16 a of the PLL unit 16.

The modulation circuit 14 modulates recording data supplied from an error correction circuit 32 described later into a signal suitable for recording, for example, 2-7 modulation data. Laser drive circuit 15
Drives the semiconductor laser oscillator 19 in the optical head 5 with the 2-7 modulation data modulated by the modulation circuit 14.

The PLL circuit 16a of the PLL section 16 generates a reference clock signal serving as a reference for data reproduction, and outputs the reference clock signal in synchronization with a predetermined input signal. The reference clock signal is generated by a not-shown voltage controlled generator VCO (Voltage Controlled Osillater). The PLL section 16 will be described later together with the points of the present invention.

A laser beam generated by a semiconductor laser oscillator (or an argon-neon laser oscillator) 19 driven by a laser drive circuit 15 is irradiated onto the optical disc 1 via a collimator lens 20, a half prism 21, and an objective lens 10. The light reflected from the optical disc 1 is guided to a photodetector 24 via an objective lens 10, a half prism 21, a condenser lens 22, and a cylindrical lens 23.

The photodetector 24 is a four-divided photodetection cell 24
a, 24b, 24c and 24d.
The output signal of the photodetector cell 24a of the photodetector 24 is supplied to one end of adders 26a and 26d via the amplifier 25a. The output signal of the light detection cell 24b is supplied to one end of adders 26b and 26c via the amplifier 25b. The output signal of the light detection cell 24c is supplied to the other ends of the adders 26a and 26c via the amplifier 24c. Photodetection cell 24d
Is output to an adder 26b, 2 via an amplifier 25d.
6d is supplied to the other end.

The output signal of the adder 26a is a differential amplifier OP
2 and the non-inverting input terminal of the differential amplifier OP2 is supplied with the output signal of the adder 26b.
As a result, the differential amplifier OP2 includes the adders 26a, 26
A signal related to the focus point is supplied to the focusing control circuit 27 in accordance with the difference b. The output signal of the focusing control circuit 27 is
The laser beam is supplied to the optical disc 1 so that the laser beam is always just focused on the optical disc 1.

The output signal of the adder 26c is a differential amplifier OP
1, and the output signal of the adder 26c is supplied to the non-inverting input terminal of the differential amplifier OP1.
As a result, the differential amplifier OP1 includes the adders 26d and 26d.
A track difference signal is supplied to the tracking control circuit 28 in accordance with the difference c. The tracking control circuit 28 creates a track drive signal according to the track difference signal supplied from the differential amplifier OP1.
The track drive signal output from the tracking control circuit 28 is supplied to the drive coil 12 in the tracking direction. The track difference signal used in the tracking control circuit 28 is supplied to the linear motor control circuit 8.

As described above, each of the photodetection cells 24 of the photodetector 24 in the state where focusing and tracking have been performed.
The sum signal of the outputs a to 24d, that is, the output signal from the adder 26e, reflects the change in the reflectance from the pits (recording data) formed on the track. This signal is supplied to the data reproducing circuit 18 and the PLL circuit 16a
The data recorded on the optical disc is reproduced based on the clock signal for reproduction from the optical disk.

The data reproducing circuit 18 includes an adder 26
e, and a sector mark SM in the preformat is detected based on the clock signal for reproduction from the PLL circuit 16a.
The binary signal supplied from the LL circuit 16a is reproduced with a track number and a sector number as address information based on a clock signal for reproduction.

The reproduced data reproduced by the data reproducing circuit 18 is output to an error correction circuit 32 via a bus 29. The error correction circuit 32 corrects an error using an error correction code (ECC) in the reproduction data, or adds an error correction code to the recording data supplied from the interface circuit 35 and outputs the recording data to the memory 2.

The reproduced data having been subjected to the error correction by the error correction circuit 32 is supplied to the bus 29 and the interface circuit 3.
5 to an optical disk control device 36 as an external device. The recording data is supplied from the optical disk control device 36 to the error correction circuit 32 via the interface circuit 35 and the bus 29.

When the tracking control circuit 28 moves the objective lens 10, the linear motor control circuit 8 operates the linear motor 6, that is, the optical motor 5 so that the objective lens 10 is positioned near the center of the optical head 5. Head 5
Is to be moved.

In this optical disk apparatus, a D / A used for exchanging information between a focusing control circuit 27, a tracking control circuit 28, a linear motor control circuit 8, and a CPU 30 for controlling the entire optical disk apparatus. A converter 31 is provided.

The above-mentioned motor control circuit 4, linear motor control circuit 8, laser control circuit 15, data reproduction circuit 1
8, a focusing control circuit 27, a tracking control circuit 28, an error correction circuit 32, etc.
This is controlled by the PU 30 and this C
The PU 30 performs a predetermined operation according to a program recorded in the memory 2.

Next, the details of the PLL section 16 will be described, and points of the present invention will be described. Normally, at the time of data reproduction, a binary data reproduction signal output from the data reproduction circuit 18 is always input to the PLL circuit 16a. That is, the data reproduction signal output from the data reproduction circuit 18 is input not only at the time of reproducing the header section and the data section shown in FIG. 3 but also at the time of reproducing the gap section and the buffer section. In other words, random noise or defects that may occur in the gap or the buffer are binarized by the data reproducing circuit 18 and
This is input to the L circuit 16a. As a result, the PLL circuit 16a may synchronize with the binarized signal of the noise or the defect, fail to output the normal reference clock signal, and fail to read the data in the header portion and the data portion in a certain period. is there.

Therefore, according to the present invention, when reproducing the gap portion and the buffer portion, the data reproduction signal output from the data reproduction circuit 18 is not supplied to the PLL circuit 16a.
The master clock signal output from the master clock circuit 17 is supplied to the PLL circuit 16a. This master clock signal is a signal having substantially the same frequency as the reference clock signal generated by the PLL circuit 16a.

In this case, even if there is noise or a defect in the gap or the buffer, even if the noise or the defect is binarized by the data reproducing circuit 18,
Since it is not finally supplied to the PLL circuit 16a, PL
It does not affect the operation of the L circuit 16a. In reproducing data from the gap section and the buffer section, since the master clock signal is supplied to the PLL circuit 16a, the reference clock signal is output in synchronization with the master clock signal. Therefore, the operation of the PLL circuit 16a is normally maintained, and the data in the next header section and data section can be read normally.

As described above, FIG. 4 shows an input signal selecting means for switching the input signal to the PLL circuit 16a when reproducing the header and data portions and when reproducing the data from the gap portion and the buffer portion. It will be described with reference to FIG.

In FIG. 4, a master clock signal output from a master clock generation circuit 17 is input to an AND circuit 16b. Further, the AND circuit 16b
, A PLL enable signal output from the controller 30a is input via a NOT circuit 16c. on the other hand,
The binarized reproduction signal output from the data reproduction circuit 18 is input to the AND circuit 16d. Furthermore, this A
The PLL enable signal output from the controller 30a is input to the ND circuit 16d. The outputs of the AND circuits 16b and 16d are input to the OR circuit 16e. The output of the OR circuit 16e is
is input to a.

With such a configuration, the controller 30
a according to a PLL enable signal output from
The input signal to the L circuit 16a is selectively switched.
As shown in FIG. 5, at the time of reproducing the header section and the data section, a reproduced signal output from the data reproducing circuit 18 is selected by outputting a HIGH level PLL enable signal. On the other hand, at the time of reproduction of the gap section and the buffer section, a low level PLL enable signal is output, so that the master clock generation circuit 17
The master clock signal output from is selected.

It should be noted that the controller 30a is connected to the CP of FIG.
It is provided in the U section 30, detects the positions of the gap section and the buffer section based on the address data of the header section included in the reproduction data output from the data reproduction circuit 18, and outputs the PLL enable signal at a predetermined timing. And output.

[0050]

According to the present invention, when data is reproduced from the gap section and the buffer section in the sector format of the optical disk, the input of the PLL circuit is switched to the master clock signal, thereby preventing the malfunction of the PLL circuit and reading the data. An optical disk device (information reproducing device) that can reduce errors can be provided.

[Brief description of the drawings]

FIG. 1 is an information reproducing apparatus according to an embodiment of the present invention;
That is, a diagram schematically showing the configuration of the optical disk device.

FIG. 2 is a diagram illustrating a format of an optical disc.

FIG. 3 is a diagram illustrating a format of a sector.

FIG. 4 is a diagram showing a configuration of input signal selection means for selecting an input signal to a PLL circuit.

FIG. 5 is a diagram showing states of a PLL enable signal in a header section, a gap section, a data section, and a buffer section.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Optical disk 2 ... Memory 13 ... Laser control circuit (reproduction means) 14 ... Modulation circuit 15 ... Laser drive circuit 16 ... PLL part (input signal selection means) 16a ... PLL circuit (synchronization means) 17 ... Master clock generation circuit (reference) Clock equivalent signal output means 18 data reproduction circuit (reproduction means and reproduction signal output means) 19 laser transmitter (reproduction means and irradiation means) 24 photodetector (reproduction means and detection signal output means) 30 ... CPU 30a ... Controller (input signal selection means) 31 ... D / A converter

Claims (5)

[Claims] An information reproducing apparatus for reproducing an information recording medium comprising a data recording area on which data is recorded and a data non-recording area on which no data is recorded reproduces the data recorded on the information recording medium. Reproducing means; a synchronizing means for generating a reference clock signal as a reference when reproducing data recorded on the information recording medium and synchronizing the reference clock signal with a predetermined input signal and outputting the same; When reproducing a recording area, a predetermined signal is selected as an input signal to the synchronization means, and when reproducing the data recording area, an input signal for selecting a reproduction signal of data reproduced by the reproduction means as an input signal to the synchronization means. An information reproducing apparatus, comprising: signal selection means. 2. Data recorded on an information recording medium comprising an address area in which address data indicating a position on the information recording medium is recorded, a recording area in which recording data is recorded, and a margin area. In an information reproducing apparatus for reproducing, a reproducing means for reproducing data recorded on an information recording medium, and a reference clock signal serving as a reference when reproducing data recorded on the information recording medium are generated. Synchronizing means for synchronizing a signal with a predetermined input signal and outputting the same; reference clock equivalent signal output means for generating and outputting a reference clock equivalent signal corresponding to the reference clock signal; and detecting a position of the margin area. When reproducing the margin area, the reference clock phase output from the reference clock equivalent signal output means as an input signal to the synchronization means. An information reproducing apparatus, comprising: input signal selecting means for selecting the signal and selecting a reproduction signal of data reproduced by the reproducing means when reproducing the address area and the recording area. 3. An optical disc apparatus for reproducing an optical disc comprising a data recording area on which data is recorded and a data non-recording area on which no data is recorded, a reproducing means for reproducing data recorded on the optical disc, and an optical disc. A synchronizing means for generating a reference clock signal serving as a reference when reproducing data recorded in the data, and synchronizing the reference clock signal with a predetermined input signal and outputting the same; and Input signal selecting means for selecting a predetermined signal as an input signal to the means, and selecting a reproduced signal of data reproduced by the reproducing means as an input signal to the synchronizing means when reproducing the data recording area. An optical disk device characterized by the above-mentioned. 4. An optical disc apparatus for reproducing data recorded on an optical disc, comprising an address area for recording address data indicating a position on the optical disc, a recording area for recording data, and a margin area. Generating reproduction means for reproducing data recorded on the optical disk; and generating a reference clock signal as a reference when reproducing the data recorded on the optical disk, and synchronizing the reference clock signal with a predetermined input signal. Synchronizing means for generating and outputting a reference clock equivalent signal corresponding to the reference clock signal; detecting means for detecting the position of the margin area; A reference clock equivalent signal output from the reference clock equivalent signal output means as an input signal of And an input signal selecting means for selecting a reproduction signal of data reproduced by the reproducing means when reproducing the address area and the recording area. 5. An address area having concentric or spiral tracks on which data is recorded, having a predetermined track length and recording address data indicating a position on the track, and recording data for recording. Is recorded, a first margin area provided between the end of this address area and the end of this recording area, and a first margin area provided between the end of this recording area and the end of the next address area. And an irradiating means for irradiating the optical disk with a light beam in an optical disk apparatus for reproducing data recorded on an optical disk whose format is defined such that a sector area composed of a second margin area and a sector area are continuous. Receiving the reflected light of the light beam irradiated from the irradiating means from the optical disk and outputting a detection signal for detecting the received reflected light. Detection signal output means for outputting a reproduction signal of data recorded on the optical disk based on the detection signal output by the detection signal output means; Synchronizing means for generating a reference clock signal as a reference for reproduction, comparing the phase of the reference clock signal with the phase of a predetermined input signal, and synchronizing the reference clock signal with the predetermined input signal and outputting the same. Master clock signal output means for generating and outputting a master clock signal corresponding to the reference clock signal; and the first and second clock signals based on the address data included in the reproduction signal output from the reproduction signal output means. 2 at the time of reproduction of the first and second margin areas. And selecting a master clock signal output from the master clock signal output means, and when reproducing the address area and the recording area, the address area and the address signal output from the reproduction signal output means as input signals to the synchronization means. An input signal selection means for selecting a reproduction signal of the data in the recording area.