JP3097372B2 - Recording and playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium on which a control mark for controlling the tracking of a track for recording information by a head is formed in advance, and a recording / reproducing apparatus using the recording medium.

[0002]

2. Description of the Related Art In recent years, the recording density of recording / reproducing apparatuses has been remarkably improved. In particular, in a recording / reproducing apparatus using a disk-shaped recording medium such as a magnetic disk or an optical disk, efforts have been made to reduce the track interval in order to improve the recording density, and many tracking methods have been developed to realize this. .

An example of the above-described conventional tracking method will be described below with reference to the drawings.

FIG. 4 shows an example of an optical recording medium (optical disk) using a conventional tracking means. In FIG. 4, reference numerals 1a to 1d denote tracks, each of which indicates a virtual center line of a track for recording information. 2a-d and
3a-d are wobble marks for detecting a tracking error for tracking control of a light spot for reproduction or recording. Reference numeral 4 denotes a control area, which is discretely provided at a plurality of predetermined rotational angle positions along each track 1. Reference numeral 5 denotes a data area, and information is recorded in an area sandwiched between the control areas 4.

With respect to the recording medium configured as described above, a method of manufacturing the recording medium and a method of detecting a tracking error for tracking of a recording / reproducing apparatus using the same will be described below.

First, a method for manufacturing such an optical disk will be described. There are two methods of manufacturing an optical disc: a method of producing a master disc and then copying a large amount of it, and a method of producing a master disc by directly recording one laser beam at a converged light spot. Generally, the former is often used, but there is no essential difference in either method with respect to tracking. Therefore, the latter case will be described here as an example to simplify the description. In order to manufacture an optical disc by recording with a light spot, first, an unrecorded disc having a recording film formed on a substrate is prepared. A track is formed by scanning the unrecorded disk with a light spot that blinks according to a predetermined signal while rotating the unrecorded disk. At this time, since the light spot moves slowly along the radius as the disk rotates, the track becomes spiral. The distance that the light spot moves during one rotation of the disk is the track interval. When the light spot scans a predetermined rotation angle position corresponding to the data area 5,
The irradiation light amount of the light spot is modulated according to the information to be recorded, and a mark corresponding to the change in the light amount is formed. When creating an optical disc that can record information later,
In this part, almost nothing is recorded, and only information such as an address is recorded. When the light spot scans a rotational angle position corresponding to the control area 4, the wobble marks 2 and 3 are illuminated by a light spot at predetermined timing in a position displaced laterally from the center of the track. Is formed. Also, the wobble marks 2 and 3 are shifted in the opposite directions in the odd-numbered track and the even-numbered track, respectively. Therefore, between two adjacent tracks, either the wobble mark 2 or 3 is shifted so as to be close to each other. The wobble mark as described above can be recorded by deflecting a recording laser beam with an acousto-optic deflecting element or an electro-optic deflecting element to displace a light spot.

Next, a method of detecting a tracking error when the recording / reproducing apparatus performs tracking using the recording medium thus manufactured will be described. For example, it is assumed that the light spot of the recording / reproducing apparatus tracks the track 1b. The light spot is the wobble mark 2b and 3b
, The amount of reflected light is modulated by these wobble marks. Since it is known in advance that the control area 4 is located at the predetermined rotation angle position, it is detected as a change in the amount of reflected light when the light spot passes through the position where the wobble marks 2b and 3b are arranged. The value of the detection signal is sampled. When the light spot is tracking the center of the track 1b, these wobble marks 2b and 3b are shifted from the center of the track 1b by the same amount to the left and right, so that the marks recorded at the center of the track 1b pass. Also, the degree of modulation of the reflected light amount is reduced by an equal amount. If the light spot tracks a position deviated from the center of the track 1b, a difference occurs in the degree of modulation of the amount of light reflected by these wobble marks 2b and 3b. Therefore, a tracking error can be detected by comparing the level of the detection signal sampled at each wobble mark position. Further, in tracks 1a and 1c adjacent on both sides, wobble marks 2 and 3 shift in the opposite direction to the case of track 1b. For this reason, even if the track interval is narrowed, the wobble marks 2b and 2c work together as if they were one wobble mark of the track 1b, and the wobble marks 3a and 3b work together as if they were the other of the track 1b. Acts like a wobble mark. In other words, the crosstalk from the wobble mark of the adjacent track does not disturb the tracking error detection, but rather acts to assist this. Since the tracking error signal when the recording / reproducing head traverses the track of the recording medium configured as described above changes in two track cycles, the dynamic range of the tracking error detection becomes twice as large as usual and the track interval becomes narrow. However, it is possible to stably detect the tracking error (for example, US Pat. No. 5,012,460, fifth stage).

[0008]

However, in the above-described configuration, when the track spacing becomes uneven due to fluctuations in the feed control for moving the position of the light spot in the radial direction during the production of the master, the crosstalk from the tracks adjacent to both sides will occur. There is a problem that an imbalance occurs in the amount, and this becomes an offset for tracking error detection.

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a recording medium capable of accurately detecting a tracking error even when a track interval is narrow and non-uniform, a method of manufacturing the same, and accurate tracking using the recording medium. And a recording / reproducing apparatus for performing the above.

[0010]

In order to solve the above-mentioned problems, a recording / reproducing apparatus according to the present invention provides information in a concentric or spiral form.
Information at each of a plurality of predetermined rotational angular positions on each track.
A first control area is discretely provided, and the first control area is provided.
Control at a plurality of predetermined rotational angle positions that do not overlap the area
In a recording medium in which areas are arranged discretely,
Tracking error in the first control area on the track
A control mark for detecting
This control mark is formed in the second control area.
In addition, on the even-numbered track, the second control area
The control mark is formed and the first control area is formed.
Information on a recording medium where this control mark is not formed in the area.
And a recording head for recording information.
To control the position of the media to follow the track
Racking control means, and
When recording information on the rack,
Control means is formed at the same time as forming a predetermined track
When scanning a series of control marks
It is obtained according to the tracking error detected from the control mark.
The first error signal to be detected and the
A series of control keys formed simultaneously when forming the rack
Of these adjacent tracks when scanning between
It is obtained according to the tracking error detected from the control mark.
Low frequency components including direct current from the second error signal
The tracking control of the recording head is performed based on the removed component.
It is characterized by that. Also, the information is concentric or spiral.
Information at each of a plurality of predetermined rotational angular positions on each track.
A first control area is discretely provided, and the first control area is provided.
Control at a plurality of predetermined rotational angle positions that do not overlap the area
In a recording medium in which areas are arranged discretely,
Tracking error in the first control area on the track
A control mark for detecting
This control mark is formed in the second control area.
In the second control area on the even-numbered track,
The control mark is formed and the first control area is formed.
Information from a recording medium on which this control mark is not formed.
And a reproducing head for reproducing the information.
To control the position of the media to follow the track
Racking control means, and
When reproducing information from the rack, the tracking
The control means is simultaneously formed when forming a predetermined track.
When scanning a series of control mark parts
According to the tracking error detected from the control mark
Low frequency components including DC from the obtained first error signal
And the track adjacent to the predetermined track
A series of control marks formed simultaneously when forming
Control of these adjacent tracks when scanning between minutes.
Obtained according to the tracking error detected from the peak
Following control of the reproducing head based on the second error signal
It is characterized by doing.

[0011]

[0012]

[0013]

According to the present invention, there is provided a method for manufacturing a recording medium as described above and a recording and reproducing apparatus using the recording medium as described above.
When information is recorded on a predetermined track, the tracking control means for causing the recording head to follow the predetermined track has a tracking error detected from a control mark recorded simultaneously when the predetermined track is formed in advance in a low frequency region. Tracking control based on
This allows the recording head to accurately follow the center of a predetermined track.

When information is reproduced from a predetermined track, the tracking control means for causing the reproducing head to follow the predetermined track is recorded simultaneously in a low frequency region when a track adjacent to the predetermined track is previously formed. Since the tracking control is performed based on the tracking error detected from the control mark, the reproducing head follows the center of the adjacent track so that the crosstalk is minimized.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a recording medium according to one embodiment of the present invention will be described.
This will be described with reference to the drawings.

FIG. 1 is a conceptual diagram of a track of an optical recording medium (optical disk) according to a first embodiment of the present invention. In FIG. 1, reference numeral 5 denotes a data area, which is an area for recording data as in the conventional example. 10a-h is a virtual center line of the track, 10a, 10c, 10e, and 10g are odd-numbered tracks, and 10b, 10d, 10f, and 10h are even-numbered tracks. 1a, 11c, 11e, 11g, 12a, 12c, 12e, 12g, 14b, 14d, 1
4f, 14h, 15b, 15d, 15f, 15h are wobble marks, 11a and 12
a, 11c and 12c, 14b and 15b, 14d and 15d, and the like constitute a control mark respectively. 13a-h and 16a-h are clock marks for detecting a clock phase error, and are recorded in advance when forming each track. Reference numeral 17 denotes a first control area, in which wobble marks 11, 12 are recorded in advance only when odd-numbered tracks are formed. Reference numeral 18 denotes a second control area in which a wobble mark is formed only when an even-numbered track is formed.
14,15 are recorded in advance.

A method of manufacturing the recording medium having the above-described configuration will be described below with reference to FIG.

When an optical disk as shown in FIG. 1 is manufactured, a track is formed by scanning with an optical spot whose irradiation intensity has been modulated while rotating an unrecorded disk, as in the prior art. The difference from the conventional example is that there are two types of control areas, a first control area 17 and a second control area 18. When forming odd-numbered tracks, control marks are recorded only in the first control area 17. When forming an even-numbered track, a control mark is recorded only in the second control area 18. That is, for example, when forming the odd-numbered track 10a, the wobble marks 11a and 12a and the clock mark 1 are used when the light spot scans the first control area 17.
3a is recorded, and when passing through the second control area 18, only the clock mark 16a is recorded. On the other hand, for example, when forming the even-numbered track 10b, the light spot
Wobble marks 14b, 15b when scanning the control area 18 of
And a clock mark 16b, and the first control area 17
, Only the clock mark 13b is recorded. One wobble mark recorded in this way has the same function as two wobble marks recorded close to each other between adjacent tracks in the conventional example. First control area
The 17 and the second control areas 18 are alternately arranged on the track, and are arranged, for example, at about 1500 locations on one circumference of the track.

Next, the tracking control of the recording / reproducing apparatus according to one embodiment using the optical disk manufactured as described above will be described with reference to the drawings.

FIG. 2 is a block diagram of a recording / reproducing apparatus according to the first embodiment of the present invention. In FIG. 2, 20 is a recording medium, 21 is a recording / reproducing head, and the recording / reproducing head 21 records a signal on the recording medium 20 or reproduces a signal from the recording medium. A preamplifier 22 amplifies a weak signal reproduced by the recording / reproducing head 21 and also functions as a buffer amplifier. 23 is a channel divider
The output signal from the preamplifier 22 is distributed according to a switching signal supplied from the outside. An information reading circuit 24 reads information from a signal sent from the channel divider 23 and outputs it as a reproduction signal to the outside. A clock extraction circuit 25 extracts a synchronization signal from the output signal from the preamplifier 22, and outputs a clock signal synchronized with the synchronization signal.
26 is a timing generation circuit that manages the rotation angle position of the recording medium 20 by counting clock signals,
It generates timing signals necessary for the operation of each unit. 27 is T
In the E extraction circuit, based on the signal sent from the channel divider 23, the first control area 17 and the second control area 18
A signal sequence obtained by sampling and holding all signals detected in accordance with the tracking error in both cases is used as a first tracking error signal, and one of the first control region 17 and the second control region 18 responds to the tracking error. A signal sequence obtained by sampling and holding the detected signal is output as a second tracking error signal. 28 is a high-pass filter, 29 is a low-pass filter, 30 is an adder, and the high-pass filter 28 extracts a low frequency component in the tracking control band from the first tracking error signal output from the TE extraction circuit 27. The low-pass filter 29 removes and outputs a high frequency component in the tracking control band from the second tracking error signal output from the TE extraction circuit 27, and outputs the high-pass filter. 28 and a signal obtained by adding output signals from the low-pass filter 29. 31
Denotes a control circuit, and 32 denotes an actuator. The control circuit 31 applies a filter compensation to the output signal of the adder 30, amplifies the power, drives the actuator 32, and drives the recording / reproducing head.
Correct the position of 21. A drive circuit 33 drives the recording / reproducing head 21 by power-amplifying a recording signal input from the outside when recording information on the recording medium 20. Numeral 34 denotes a control circuit which controls each part so as to record or reproduce information based on a command signal given from the outside.

The operation of the recording / reproducing apparatus configured as described above will be described below with reference to FIG.

In order for the recording / reproducing head 21 to follow a predetermined track, a tracking error which is a position error of the recording / reproducing head 21 with respect to the predetermined track is detected, and a control circuit 31 and an actuator 32 are operated in accordance with the tracking error. The tracking control for adjusting the position of the recording / reproducing head 21 is performed. In this embodiment, the tracking error is sampled when the recording / reproducing head 21 passes through the first control area 17 and the second control area 18. For this purpose, the recording / reproducing head 21 is controlled by the first control area 17 and the second control area 17.
It is necessary to perform accurate sampling in synchronization with the timing of passing through the control region 18 of FIG. A synchronization system for achieving such synchronization is constituted by a clock extraction circuit 25 and a timing generation circuit 26. In order to establish the synchronization of this synchronization system, the clock extraction circuit 25 uses the reproduction signal from the recording / reproducing head 21 amplified by the preamplifier 22 to generate a unique synchronization mark (not shown) The synchronization signal obtained when passing through the portion is searched for, and upon finding this, the timing generation circuit 26 is initialized immediately. The clock extraction circuit 25 includes a clock generation circuit composed of a PLL.
Sent to The timing generation circuit 26 counts this clock, and places the recording / reproducing head 21 on the clock mark 13.
, A window pulse having a predetermined time width before and after the timing predicted to pass is generated and sent to the clock extraction circuit 25. If the clock extraction circuit 25 finds a change in the reproduction signal that is seen when the recording / reproduction head 21 passes through the mark portion within the time when the wind pulse is being sent, it regards this as the one corresponding to the clock mark 13. , With which the PLL is synchronized. Since the above-mentioned unique synchronization marks and clock marks 13 are provided at the same rotational angle position of each track and are arranged in the radial direction of the recording medium 20, they can be read even if tracking control is not performed. Therefore, a synchronization system can be established prior to tracking control. When the synchronization system is established,
Since the timing at which the recording / reproducing head 21 passes through the wobbled marks 11, 12, 14, and 15 can be determined by counting the clock, the timing generation circuit 26 sends a first timing signal notifying the timing to the channel divider 23. Send to Upon receiving the first timing signal, the channel divider 23 sends out a reproduction signal to the TE extraction circuit 27. The TE extraction circuit 27 alternately samples and holds the difference between the reproduction signals corresponding to the wobble marks 11 and 12 and the difference between the reproduction signals corresponding to the wobble marks 14 and 15, in synchronization with the first timing signal. A series of sample-and-hold signals is used as a first tracking error signal.

In the prior art, tracking control was performed based only on the first tracking error signal. In this embodiment, however, low frequency components are removed from the first tracking error signal by the high-pass filter 28. Only frequency components are used. A frequency component having a low tracking error is detected as follows. For example, when an external command signal is given to the control circuit 34 to record information on an odd-numbered track, for example, the track 10c,
The control circuit 34 sends a second timing signal to the TE extraction circuit 27 at a timing when the recording / reproducing head 21 passes through the first control area 17 on which the wobble mark is recorded when the track 10c is formed. The generation circuit 26 is controlled. The TE extraction circuit 27
A signal sequence obtained by sampling and holding a signal corresponding to the tracking error detected in the first control area 17 in synchronization with the timing signal of (1) is output as a second tracking error signal. Also, an even-numbered track, for example, track 11
When recording information on b, the control circuit 34 outputs a second timing signal when the recording / reproducing head 21 passes through the second control area 18 where the wobble mark is recorded when forming this track. The timing generator 26 is controlled. So in this case,
The TE extraction circuit 27 outputs, as a second tracking error signal, a signal sequence in which only a signal corresponding to the tracking error detected in the second control area 18 is sampled and held.
High frequency components are removed from the second tracking error signal thus obtained by the low-pass filter 29, and only low frequency components are extracted. The control circuit 31 drives the actuator 32 based on the low-frequency component of the second tracking error signal and the high-frequency component of the first tracking error signal to perform tracking control. When the tracking control is settled and the address at which the information is to be recorded is found, the control circuit 34 outputs a data request signal for requesting data output to the outside. The recording signal is transmitted while synchronizing with the timing signal and the clock signal output from 26. The drive circuit 33 power-amplifies the recording signal and drives the recording / reproducing head 21 to record information in the data area 5.

On the other hand, when information is reproduced, in the odd-numbered track, the tracking error detected from the crosstalk of the wobble mark recorded at the same time when the adjacent track is formed is formed in the second control area 18, contrary to the recording. , And for even-numbered tracks,
In the first control area 17, a signal sequence corresponding to the tracking error detected from the crosstalk of the wobble marks recorded simultaneously when the adjacent tracks are formed is respectively transmitted to the second control area 17.
Control circuit to make the tracking error signal
34 controls the TE extraction circuit 27. A low-pass filter is obtained from the second tracking error signal thus obtained.
The tracking control is performed based on the low-frequency component extracted by removing the high-frequency component and the high-frequency component of the first tracking error signal by 29. When the tracking control is settled, it becomes possible to read information from a predetermined track in a good state. The timing generation circuit 26 supplies a timing signal to the channel divider 23 so that a reproduction signal when the recording / reproduction head 21 passes through the data area 5 is transmitted to the information reading circuit 24. When an address from which information is to be read is found from the reproduction signal input to the information reading circuit 24 in this manner, the subsequent reproduction signal is output to the outside.

As described above, according to this embodiment, the control areas for detecting the tracking error are provided at a plurality of predetermined rotation angle positions on each track of the optical disk, and these are provided with the first control area and the second control area. The control area is divided into two types. A wobble mark for detecting a tracking error is recorded only in the first control area when forming the odd-numbered track, and only in the second control area when forming the even-numbered track. The control means for recording a wobble mark on a recording medium and performing tracking control of a recording / reproducing apparatus using this recording medium detects a wobble mark recorded simultaneously with the formation of a track to be recorded at the time of recording in a low frequency region within a control band. Tracking control is performed only in accordance with the tracking error. Even when the uneven right, can be in the wobble marks recorded when forming the adjacent tracks are not affected, tracking faithfully without offsetting the center of the track. Therefore, the recorded information mark and the mark such as the address recorded in advance can be aligned on the same straight line.

During reproduction, the tracking control output is in a low frequency region, and tracking control is performed in accordance with a tracking error detected from crosstalk of wobble marks recorded simultaneously when adjacent tracks are formed. As a result, the center of both adjacent tracks can be tracked.

Further, in a high frequency region, the control is performed based on a signal corresponding to a tracking error detected in all of the first and second control regions. If the total number of the first control region and the second control region is the same as the conventional one, the same control band as the conventional one can be secured.

Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a conceptual diagram of an optical disc in the second embodiment. In the figure, reference numeral 5 denotes a data area, which is an area for recording data as in the conventional example. Clock marks 13a-h and 16a-h are the same as those in the first embodiment. 40a-h is the virtual center line of the track, 40a, 40c, 40e, 40g are the odd-numbered tracks, 40b, 40
d, 40f, and 40h indicate even-numbered tracks. 41a, 41c, 41e, 4
1g, 42b, 42d, 42f, and 42h are control marks, 43 is a first control area, 44 is a second control area, and the first control area is used for forming an odd-numbered track to detect a tracking error.
The control mark 41 is added to the 43 at the time of forming the even-numbered track.
The control mark 42 is recorded in advance in the control area 44.

The optical disk constructed as described above is essentially the same as the first embodiment except that the control mark is not a wobble mark, and has the same effect. The only difference from the first embodiment is the tracking error detection method. In the first embodiment, the tracking error is detected from the difference between the reproduction signal levels of two paired wobble mark portions as in the conventional example, but in the present embodiment, the light spot passes through the control mark portion. The change in the distribution of the reflected light amount according to the tracking error at that time is received by the two-divided light receiving element, and the tracking error is detected as the difference between the detected light amounts. Alternatively, a tracking error can be detected from a phase difference between two signals obtained from two portions of the light receiving element.

As described above, the present invention can obtain the effect essentially irrespective of the tracking error detection method.

In the embodiment, the recording medium is an optical disk. However, the concept of the present invention is not limited to the recording / reproducing method at all, and the recording medium reproduces information from a magnetic recording medium or a change in capacitance. It can also be applied to media and the like.

Further, in this embodiment, the first control area
Although the 17 and the second control areas 18 are arranged alternately, a plurality of first control areas 17 and a plurality of second control areas 18 may be arranged alternately.

[0033]

As described above, according to the present invention, a plurality of first signals for detecting a tracking error in each track of a recording medium are provided.
And a plurality of second control areas are discretely provided at predetermined rotation angle positions so as not to overlap with each other, and when an odd-numbered track is formed, a tracking error is detected only in the first control area. Record the control mark of
When an even-numbered track is formed, a control mark is recorded only in the second control area, and the tracking control means of the recording / reproducing apparatus using this recording medium controls a track to be recorded at the time of recording in a low frequency area within the control band. The control is performed in accordance with the tracking error detected from the control mark recorded simultaneously with the formation of the adjacent track, and the reproduction is controlled in accordance with the tracking error detected from the crosstalk of the control mark recorded simultaneously when the adjacent track is formed. In the frequency domain, both recording and reproduction are controlled in accordance with the tracking error detected in all of the first and second control areas, so that the center of the track to be recorded can be accurately recorded at the time of recording. The center of both adjacent tracks can be tracked and the crosstalk is minimized during playback. It is possible to accurately track the total number of control regions arranged in one round of the track can secure the same control band the conventional same as conventional.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of a recording medium according to a first embodiment of the present invention.

FIG. 2 is a block diagram of the recording / reproducing apparatus in the embodiment

FIG. 3 is a conceptual diagram of a recording medium according to a second embodiment of the present invention.

FIG. 4 is a conceptual diagram of a conventional recording medium.

[Explanation of symbols]

10a, 10c, 10e, 10g, 40a, 40c, 40e, 40g Virtual center line of odd track 10b, 10d, 10f, 10h, 40b, 40d, 40f, 40h Virtual center line of even track 11a, 11c, 11e, 11g, 12a, 12c, 12e, 12g Wobble marks recorded on odd-numbered tracks 14b, 14d, 14f, 14h, 15b, 15d, 15h, 15h Wobble marks recorded on even-numbered tracks 13a-h, 16a-h Clock mark 17,43 First control area 18,44 Second control area 23 Channel divider 25 Clock extraction circuit 26 Timing generation circuit 27 TE extraction circuit 28 High-pass filter 29 Low-pass filter 34 Control circuit 41a , 41c, 41e, 41g Control marks to be recorded on even-numbered tracks 42b, 42d, 42f, 42h Control marks to be recorded on odd-numbered tracks

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinichi Kadowaki 1006 Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-4-319532 (JP, A) JP-A-4- 313826 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B 20/12 G11B 7/007 G11B 7/26

Claims (2)

(57) [Claims] 1. Recording information concentrically or spirally
The first control area is provided at a plurality of predetermined rotation angle positions of each track.
Areas are discretely arranged and do not overlap with the first control area.
The second control region is discrete at predetermined plural rotation angle positions.
On the odd-numbered track of the recording medium
A tracking error is detected in the first control area.
Control marks are formed on the same track
This control mark is formed in the second control area.
However, the second control area on the even-numbered track does not
The above control mark is formed and the
The control mark is not formed in the first control area.
A recording head for recording information on a recording medium, and tracking control means for controlling the position of the recording head so that the recording head follows the track of the recording medium, and records information on a predetermined track of the recording medium. Sometimes, when the tracking control means scans a series of control mark portions formed simultaneously when forming a predetermined track, the first error signal obtained in accordance with a tracking error detected from these control marks is obtained. And when scanning between a series of control mark portions formed simultaneously when forming a track adjacent to a predetermined track, a second control mark obtained according to a tracking error detected from control marks of these adjacent tracks. Tracking control of the recording head based on a component obtained by removing a low frequency component including DC from the error signal of Recording reproducing apparatus according to claim and. 2. Recording information in a concentric or spiral form.
The first control area is provided at a plurality of predetermined rotation angle positions of each track.
Areas are discretely arranged and do not overlap with the first control area.
The second control region is discrete at predetermined plural rotation angle positions.
On the odd-numbered track of the recording medium
A tracking error is detected in the first control area.
Control marks are formed on the same track
This control mark is formed in the second control area.
However, the second control area on the even-numbered track does not
The above control mark is formed and the
The control mark is not formed in the first control area.
A reproducing head for reproducing information from the stomach recording medium, the reproducing head and a tracking control means for controlling the position so as to follow the tracks of the recording medium, reproducing information from a predetermined track of the recording medium Sometimes
The above-mentioned tracking control means, when scanning a series of control marks formed simultaneously when a predetermined track is formed, scans a DC signal from a first error signal obtained according to a tracking error detected from these control marks. Is detected from the control marks of these adjacent tracks when scanning between a component obtained by removing low frequency components including and a series of control mark portions formed simultaneously when forming a track adjacent to a predetermined track. A recording / reproducing apparatus, which performs tracking control of the reproducing head based on a second error signal obtained according to a tracking error.