WO2007055107A1

WO2007055107A1 - Multi-layer disc and its information recording/reproducing device

Info

Publication number: WO2007055107A1
Application number: PCT/JP2006/321403
Authority: WO
Inventors: Takuya Shiroto; Fumihiko Yokogawa
Original assignee: Pioneer Corporation
Priority date: 2005-11-11
Filing date: 2006-10-26
Publication date: 2007-05-18

Abstract

It is possible to provide a multi-layer disc which can easily be manufactured and its information recording/reproducing device. A multi-layer disc is built by layering a plurality of recording layers (or recording surfaces) on which information data is recorded and a reference servo surface on which a plurality of tracking control guide tracks of different spiral forms are formed in a spiral shape from inner to outer circumference of the disc or from the outer to inner circumference of the disc. When information data is recorded or reproduced onto/from the multi-layer disc, the following operations are executed. That is, a first laser beam for recording or reading information data is applied to one of the recording layers (or recording surfaces) and a second laser beam is applied to the reference servo surface for tracking control. Tracking control is performed so that the second laser beam is applied to the guide track.

Description

Specification

Multilayer disc and information recording / reproducing apparatus thereof

Technical field

The present invention relates to a multilayer disc having a plurality of information recording layers and an information recording / reproducing apparatus for recording and reproducing information on the multilayer disc.

Background art

[0002] In recent years, a multilayer disk formed by laminating a plurality of recording layers for increasing the recording density of a recording disk has been proposed. In such a multi-layer disc, sequential information data may be recorded across two recording layers. That is, first, information data is recorded on the first recording layer in a spiral from the inner circumference side to the outer circumference side of the disc, and when the recording to the outermost circumference of the disc is completed, the disc is continuously recorded on the second recording layer. Information data is recorded spirally from the innermost circumference to the outer circumference. Therefore, in order to reproduce the information data recorded on the multi-layer disc in the above-described manner, after the information reading up to the outermost circumference of the disc with the first recording layer as a reading target is completed, the pickup is attached to the disc on the disc. The track jumps to the inner circumference, and the force is read from the second recording layer. As a result, there was a problem that access took time for the time spent for track jumping.

[0003] In order to solve this problem, a multi-layer disc has been proposed in which the spiral shape of the recording track and the recording direction of the information data as viewed from the pickup side are different between the recording layers adjacent to each other. (See Patent Document 1). According to this multilayer disc, when the recording layer to be read is transferred to another recording layer, it is not necessary to cause the pickup to track jump from the outermost periphery of the disc to the innermost periphery (or innermost peripheral force is also the outermost periphery) Therefore, the access time is shortened.

At this time, in the multilayer disk as described above, since the spiral shape of the recording track viewed from the pickup side is different for each recording layer, a guide track for tracking control is provided in each recording layer.

[0005] Therefore, the recording layer to be read is interrupted even when the recording layer is transferred to another recording layer. It is necessary that the guide tracks formed on the two recording layers to read information without any difference are formed with high precision so that they can be viewed and connected from the S pickup side. Therefore, such a multilayer disk has a problem that it is not easy to manufacture.

Patent Document 1: Japanese Patent Laid-Open No. 09-259438

Disclosure of the invention

Problems to be solved by the invention

[0006] A problem to be solved is that it is not easy to manufacture a multilayer disk.

Means for solving the problem

The multilayer disc according to the first aspect of the present invention is a multilayer disc having a plurality of recording layers or recording surfaces on which information data is recorded, and a plurality of tracking control guides each having a different spiral form. The main feature is that the track further includes a reference servo surface formed in a spiral shape.

[0008] The multilayer disc according to the second feature of the present invention is a multilayer disc having a plurality of recording layers or recording surfaces on which information data is recorded, and the inner peripheral force of the disc spirals toward the outer periphery. A first guide track for tracking control formed and a second guide track formed in a spiral shape from the outer periphery of the disk to the inner periphery in the same rotational direction as the first guide track. The information data is recorded along a recording track having the same spiral form as the first guide track in each of the recording layers or one of the recording surfaces. The information data is recorded along a recording track having the same spiral form as that of the second guide track in each of the recording layers or the other one of the recording surfaces. And main feature to be.

[0009] A multilayer disc according to the third aspect of the present invention is a multilayer disc having a plurality of recording layers or recording surfaces for recording information data, and is formed in a spiral shape toward the outer periphery of the inner peripheral force of the disc. A first reference servo surface having a first guide track for tracking control, and a first reference servo surface spirally formed from the outer periphery of the disk to the inner periphery in the same rotational direction as the first guide track. A second reference servo surface provided with two guide tracks, and each of the recording layers or one of the recording surfaces has a recording track having the same spiral shape as the first guide track. The information data is recorded along the Each of the recording layers or the other one of the recording surfaces is recorded with the information data along a recording track having the same spiral shape as the second guide track. And

[0010] Further, the information recording / reproducing apparatus according to the first feature of the present invention is formed in a spiral shape toward a plurality of recording layers or recording surfaces on which information data is recorded and from the inner periphery of the disc toward the outer periphery. The first guide track for tracking control and the second guide track for tracking control formed in a spiral shape from the outer periphery to the inner periphery of the disk in the same rotational direction as the first guide track, respectively. An information recording / reproducing apparatus for recording / reproducing information data on / from a multi-layer disc laminated with at least one reference servo surface, wherein each of the preceding recording layers or one of the recording surfaces is provided. An optical head that irradiates the reference servo surface with a second laser beam for tracking control while irradiating the first laser beam for recording or reading the information data; Tracking control means for performing tracking control on the optical head so that the second laser beam irradiates one of each of the first guide track and the second guide track. To do.

[0011] Further, the information recording / reproducing apparatus according to the second feature of the present invention is formed in a spiral shape toward a plurality of recording layers or recording surfaces on which information data is recorded and from the inner periphery of the disc toward the outer periphery. A first reference servo surface having a first guide track for tracking control, and a tracking control formed in a spiral shape from the outer periphery of the disk to the inner periphery in the same rotational direction as the first guide track. An information recording / reproducing apparatus for recording and reproducing information data to and from a multi-layer disc in which a second reference servo surface having a second guide track is laminated, each of the previous recording layers or the recording surface A second laser beam for tracking control is applied to one of the first and second reference servo surfaces while irradiating one of each with the first laser beam for recording or reading the information data. An optical head that irradiates the optical head, and a tracking control means that performs tracking control on the optical head so that the second laser beam irradiates one of the first guide track and the second guide track. It has the main feature.

The invention's effect [0012] The present invention includes a plurality of recording layers (or recording surfaces) on which information data is recorded, and a reference servo surface on which a plurality of tracking control guide tracks having different spiral forms are formed in a spiral shape. A multilayer disk is constructed by stacking. According to the powerful structure, the recording layer (or recording surface) to be read (or recorded) can be changed to another recording layer (or recording surface) simply by aligning the guide tracks formed on the reference servo surface. It is possible to manufacture a multi-layer disc that allows information data to be read (or recorded) without interruption during the process. Therefore, the manufacture becomes easier as compared with the conventional multi-layer disc that requires alignment of the guide track between the recording layers.

Brief Description of Drawings

FIG. 1 is a view showing a cross section of a multilayer disk according to the present invention.

[FIG. 2] FIG. 2 shows recording tracks formed on recording layers 2 and 2 of the multilayer disk shown in FIG.

14

FIG.

FIG. 3 is a view showing a guide track GTR and a sampled servo area SA formed on the surface of the reference servo surface 4 of the multilayer disk shown in FIG.

FIG. 4 is a diagram showing the arrangement of various pits in the sampled servo area SA formed on the surface of the reference servo surface 4 shown in FIG.

FIG. 5 is a diagram showing a configuration of an information recording / reproducing apparatus for recording and reproducing information data with respect to a multilayer disc according to the present invention.

FIG. 6 is a diagram showing a guide track GTR and a sampled servo area SAS formed on the surface of the reference servo surface 4 according to another embodiment.

FIG. 7 is a diagram showing the arrangement of various pits in the sampled servo area SAS shown in FIG.

FIG. 8 is a view showing a cross section of a multilayer disc according to another embodiment of the present invention.

FIG. 9 is a view showing an example of a guide track GTR formed in each of the reference servo surfaces 41 and 42 shown in FIG.

FIG. 10 is a view showing a cross section of a multilayer disc according to another embodiment of the present invention.

FIG. 11 is a view showing a modification of the cross-sectional structure of the multilayer disc shown in FIG. FIG. 12 is a view showing a modification of the cross-sectional structure of the multilayer disc shown in FIG. Explanation of symbols

[0014] 2 to 2 recording layers

14

4 Reference servo surface

41 1st reference servo surface

42 2nd reference servo surface

BEST MODE FOR CARRYING OUT THE INVENTION

A structure is employed in which a plurality of recording layers (or recording surfaces) and a reference servo surface in which a plurality of tracking control guide tracks each having a different spiral form are spirally formed are stacked. As a result, the recording layer (or recording surface) to be read (or recorded) is transferred to another recording layer (or recording surface) simply by aligning the guide tracks formed on the reference servo surface. In this way, it is possible to manufacture a multi-layer disc that can read (or record) information data without interruption.

Example 1

Hereinafter, the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, the multi-layer disc to be produced includes a transparent protective layer 1 that forms one surface of the disc, recording layers 2 to 2 on which information data is recorded, and a space between each recording layer 2. Transparent between

14

Each of the bright intermediate layer 3, the reference servo surface 4 such as a semi-transparent reflective film, and the disk substrate 5 is laminated.

[0019] The adjacent recording layers 2 to 2 are viewed from one side of the disc.

14

The spiral forms of the recording tracks are mirror images of each other as shown in FIGS. 2 (a) and 2 (b). Furthermore, information data recording is performed between adjacent ones of the recording layers 2 and 2.

14

The direction (direction toward the outer circumference of the disk inner circumference side or the direction from the outer circumference side of the disk towards the inner circumference) is different from each other. For example, in the recording layer 2, as shown in FIG.

1

Recording track TR that records information data in the form of a clockwise rotation toward the outer circumference

OUT

Information data is recorded along the line. In addition, the recording layer 2 adjacent to the recording layer 2

1 2 is the same as the recording track TR from the outer periphery to the inner periphery as shown in Fig. 2 (b). Recording track TR that records information data in the spiral direction of the right angle

IN

2 3 is from the inner circumference side of the disc to the outer circumference along the recording track TR as shown in Fig. 2 (a).

OUT

Information data is recorded in a right-handed spiral. Also adjacent to the recording layer 2

3 recording layer 2 along the recording track TR as shown in FIG.

4 IN

Information data is recorded in the form of a clockwise rotation toward the inner periphery.

[0020] On the surface of the reference servo surface 4, information data is recorded for each of the recording layers 2 and 2.

14

In addition, the sampled servo area for performing various sampled servo controls (tracking servo, spindle servo, focus cinder servo), etc. Is formed.

FIG. 3 is a diagram showing the positional relationship of each of the sampled servo areas formed on one surface of the reference servo surface 4 when viewed from the surface on which the reading (recording) beam light is incident.

[0022] As shown in FIG. 3, on each surface of the reference servo surface 4, each of the sampled servo areas SA indicated by the mouth 1S is formed on the recording layer 2 (or 2) as shown in FIG. 2 (a). Has been

OUT 1 3

On the guide track GTR (shown by the dotted line) in the same spiral form as the recording track TR

OUT OUT

Are distributed. Furthermore, the sampled servo area SA shown in the country

IN

As shown in Fig. 2 (b), the recording tracks TR formed on the recording layer 2 (or 2) and

2 4 IN Dispersed and arranged on the same spiral guide track GTR (shown by broken lines)

IN

ing. Here, each of the sampled servo areas SA is placed on the guide track GTR.

OUT OUT

Are arranged on the same disk radius line. On the other hand, each of the sampled servo areas SA is the sampled servo area SA on the guide track GTR.

IN IN OUT

They are placed on the disc radius line that is 45 degrees different from the disc radius line. FIG. 3 shows only two spiral guide tracks GTR and GTR.

IN OU T

The

[0023] Figure 4 shows the formation of pits in one sampled servo area (SA, SA).

IN OUT

It is a figure.

[0024] As shown in FIG. 4, in each sampled servo area, an identification pit row P indicating whether the sampled servo area belongs to the guide track GTR or GTR,

IN OUT DI Synchronization pit P, which is the synchronization reference for recording / playback, and clock phase reference, for recording / playback

SYNC

Lock pit P, wobble pit P for tracking control, and address pit train P

CLK WB AD

Various pits for sampled servo control are formed. In FIG. 4, the force for providing the identification pit row P at the beginning of the sampled servo area

DI

You can omit it. At this time, for example, in the sampled servo area SA, a predetermined first pit

IN

A synchronous pit P having a long length is formed, and the first pin is formed in the sampled servo area SA.

SYNC OUT

By forming a synchronous pit P having a second pit length different from the base length, this support

SYNC

Whether the sampled servo area belongs to the guide track GTR or GTR.

IN OUT

Make it possible.

[0025] In the multi-layer disc shown in Fig. 1 as described above, four recording layers 2 and 2 are provided.

1 4 etc. Samples for various servos used during recording and playback on each of the recording layers 2 and 2

14

A reference servo surface 4 with a guide track GTR with distributed servo areas distributed is provided separately. At this time, the guide track GTR is recorded in the recording layers 2 and 2.

1 4 Guide track GTR for tracking control to recording layer 2 (or 2) and this guide track

1 3 OUT For tracking control for recording layer 2 (or 2), which has a different spiral form than GTR

OUT 2 4

The guide track of GTR. That is, the inner circumference of the disc with respect to recording layer 2 (or 2)

IN 1 3

Force Guide track GTR for tracking control formed in a spiral shape by rotating clockwise toward the outer periphery and the same right rotation as this GTR from the outer periphery of the disk toward the inner periphery

OUT OUT

A reference having a tracking control guide track GTR formed in a spiral shape.

IN

The servo surface 4 is provided.

FIG. 5 is a diagram showing a schematic configuration of an information recording / reproducing apparatus that records and reproduces information data on a powerful multi-layer disc.

In FIG. 5, a recording modulation circuit 31 performs desired recording on the information data to be recorded on the recording layer 2, 2, 2, or 2 of the multilayer disc 200 having the structure as shown in FIG. Strange

1 2 3 4

Modulation processing according to the adjustment method is performed. At this time, the recording modulation circuit 31 performs recording modulation processing on the information data in synchronization with a timing according to a synchronous clock signal CK (described later), and supplies the obtained modulated recording signal to the light source driver 32. . During the recording operation, the light source driver 32 generates a light source driving signal having a signal level corresponding to the modulated recording signal. This is supplied to the optical head 100 mounted on a slider mechanism (not shown). On the other hand, during the reproduction operation, the light source driver 32 generates a light source driving signal having a predetermined fixed level and supplies it to the optical head 100. The slider mechanism moves the optical head 100 in the radial direction of the multilayer disk 200 in response to a tracking error signal TE described later.

The first light source 11 of the optical head 100 generates laser beam light (hereinafter referred to as the first laser beam) having optical power corresponding to the light source drive signal supplied from the light source driver 32, and supplies this to the combining prism 13. Irradiate. The second light source 12 generates laser beam light (hereinafter referred to as a second laser beam) to be irradiated on the surface of the reference servo surface 4 of the multilayer disk 200 and irradiates the synthetic prism 13 with the laser beam light. The combining prism 13 combines the first laser beam generated by the first light source 11 and the second laser beam generated by the second light source 12 with their optical axes matched to each other through the beam splitter 14. To the collimator lens 15 via The collimator lens 15 converts the combined laser beam into substantially parallel light and supplies it to the objective lens 16. The objective lens 16 condenses the combined laser beam converted into the substantially parallel light, and irradiates the surface of the multilayer disk 200 rotated by a spindle motor (not shown). At this time, the optical path length from the second light source 12 to the collimator lens 15 is shorter than the optical path length from the first light source 11 to the collimator lens 15. That is, when the second laser beam emitted from the second light source 12 is focused on the reference servo surface 4 of the multilayer disc 200, the first laser beam emitted from the first light source 11 is recorded on the recording layer 2 of the multilayer disc 200. The optical path lengths of both are set so as to collect light near 2, 2, or 2.

1 2 3 4

It is. Here, the reflected light when the multi-layer disc 200 is irradiated with the laser beam is guided to the beam splitter 112 via the object lens 16, the collimator lens 15, and the condenser lens 111. The beam splitter 112 transmits the reflected light component based on the first laser beam in the reflected light and guides it to the first photodetector 113. The beam splitter 112 transmits a reflected light component based on the second laser beam in the reflected light and guides it to the second photodetector 114. That is, the beam splitter 112 derives the reflected light component of the recording layer 2, 2, 2, or 2 of the multi-layer disc 200 to the first photodetector 113,

1 2 3 4

The reflected light component from the reference servo surface 4 of the multilayer disk 200 is sent to the second photodetector 114. It is derived. At this time, the reflected light component is given astigmatism by the beam splitter 112. The first photodetector 113 is a recording layer 2, 2, 2, or

one two Three

Two reflected light beams are simultaneously received by four light receiving surfaces and individually converted into electrical signals.

Four

As a result, four read signals RFa to RFd are generated and supplied to the information data demodulation circuit 33 and the focus error generation circuit 34, respectively.

[0029] The information data demodulation circuit 33 performs a predetermined demodulation process at a timing according to a synchronous clock signal CK (described later) based on the addition read signal obtained by adding each of the read signals RFa to RFd. . By the powerful demodulation process, the information data demodulating circuit 33 is connected to the recording layers 2 and 2 described above.

1 2

, 2 or 2 is restored and output as playback information data.

3 4

To help. The focus error generation circuit 34 generates a focus error signal FE based on the read signals RFa to RFd and supplies the focus error signal FE to the focusing character 115. The focusing actuator 115 moves the objective lens 16 in the vertical direction of the multi-layer disc 200, that is, on the so-called focus adjustment trajectory by an amount corresponding to the strong focus error signal FE. As a result, the first laser beam emitted from the first light source 11 is focused on the surface of each recording layer 2, 2, 2, or 2 of the multilayer disc 200.

1 2 3 4

Control is performed. According to strong focusing control, the first laser beam is focused on the surface of the recording layer 2, 2, 2, or 2 of the multilayer disc 200, and the second laser beam is

1 2 3 4

The second laser beam emitted from the light source 12 is substantially focused on the surface of the reference servo surface 4. The second photodetector 114 receives the reflected light from the reference servo surface 4 of the multilayer disk 200 simultaneously on the four light receiving surfaces, and converts them individually into electrical signals, thereby individually converting the four read signals Ra to Rd. Are supplied to each of the push-pull signal generation circuit 35 and the clock signal generation circuit 38. The push-pull signal generation circuit 35 generates a push-pull signal PP based on the read signals Ra to Rd output from the second photodetector 114 and supplies the push-pull signal PP to the tracking error generation circuit 36.

The tracking error generation circuit 36 extracts a low frequency component of the push-pull signal PP that works, and supplies this to the tracking actuator 116 as a tracking error signal TE. In other words, the tracking error generation circuit 36 is formed in the sampled servo area SA or SA of the reference servo surface 4 of the multilayer disk 200 as shown in FIG. Reading signal Ra obtained when reading Rupit P

The tracking error signal TE is generated based on WB to Rd. The tracking actuator 116 swings the optical axis of the objective lens 16 in the disc radial direction by an amount corresponding to the tracking error signal TE. As a result, the laser beam force emitted from the objective lens 16 can be caused to follow one of the guide tracks GTR and GTR of the reference servo surface 4 as shown in FIG.

IN OUT

King control is implemented. Therefore, when the laser beam from the objective lens 16 follows the guide track GTR of the reference servo surface 4 as shown in FIG.

IN

The beam is simultaneously irradiated on the recording layer TR of the recording layer 2 or 2. on the other hand

2 4 IN

When the laser beam from the objective lens 16 follows the guide track GTR of the reference servo surface 4 as shown in FIG.

It is irradiated onto the recording track TR of OUT 1. The clock signal generation circuit 38

3 OUT

The clock pit P as shown in FIG. 4 is formed in the sampled servo area SA or SA of the reference servo surface 4 from the added read signal obtained by adding each of the acquired signals Ra to Rd.

IN OUT CLK

A clock pulse is generated each time a signal level corresponding to reading of the signal is detected. Then, the clock signal generation circuit 38 generates a clock signal having a predetermined frequency that is phase-synchronized with the pulse train of this clock pulse, and uses this as the synchronization clock signal CK to each of the recording modulation circuit 31 and the information data demodulation circuit 33. Supply.

Next, as an example of the operation of the information recording / reproducing apparatus shown in FIG. 5, the case where sequential information data is continuously recorded on the recording layers 2 and 2 of the multilayer disc 200 is taken as an example.

1 2

I will explain.

First, the information recording / reproducing apparatus for recording information data on the recording layer 2 is an optical head 10.

1

0 is transferred to the inner circumference side of the disk. Next, the information recording / reproducing apparatus converts the first laser beam in the combined laser beam irradiated from the objective lens 16 to the recording layer 2 and the second laser beam.

1

Focus control to be focused on the surface of the reference servo surface 4 is performed. Next, as shown in FIG. 3, the information recording / reproducing apparatus reads the sampled servo area SA formed on the reference servo surface 4 and only the SA in the SA from time to time as follows.

OUT IN OUT

Perform king control. In other words, the information recording / reproducing apparatus performs sampling of the sampled servo area SA.

OUT

Based on the tracking error signal TE obtained by reading This laser beam is emitted from the object lens 16 while following the guide track GTR.

OUT

The tracking control to be irradiated on the id track GTR is performed. In addition, information

OUT

The recording / playback device reads data corresponding to the identification pit row P or the synchronous pit P as shown in FIG.

DI SYNC

By determining whether this sampled servo area is SA based on the received signal.

OUT

The first sampled servo area S A is detected.

OUT

[0033] By the tracking control as described above, the guide track GTR

1 OUT From the inner circumference of the disc toward the outer circumference along the recording track TR with the same spiral shape

OUT

Information data is sequentially recorded in a clockwise rotation. Here, the outermost disc of recording layer 2

1

When the recording up to the circumference is completed, the information recording / reproducing apparatus uses the first laser beam in the combined laser beam emitted from the objective lens 16 as the recording layer 2 and the second laser beam as the reference sensor.

2

Focus control that should be focused on the surface of the robot surface 4 respectively. Next, the information recording / reproducing apparatus executes tracking control in which only SA in the sampled servo areas S A and SA formed on the reference servo surface 4 is read as needed as shown in FIG.

OUT IN IN

. In other words, the information recording / reproducing apparatus reads the wobble pit P in the sampled servo area SA.

IN WB

Based on the tracking error signal TE obtained by sampling, the synthesized laser beam from the objective lens 16 follows the guide track GTR while following the guide track GTR.

IN IN

The tracking control that should be irradiated to is performed. By the powerful tracking control, the recording layer TR has the same spiral shape as the guide track GTR in the recording layer 2.

Information data is sequentially recorded in the form of a clockwise rotation from the outer side of the disc to the inner periphery along 2 IN IN. Note that the information recording / reproducing apparatus performs continuous recording on the recording layers 2 and 2 as described above.

1 2

In the same way as the operation, the recording layer 2 and 2 must read information data continuously.

1 2

Can do.

Therefore, according to the multilayer disk shown in FIGS. 1 to 3, when the recording layer (or recording surface) to be recorded (or read) is changed to another recording layer (or recording surface). The laser beam irradiation position on the disk surface and the spiral direction during recording (or reading) do not change! /. Accordingly, high-speed access without track jump and spindle motor rotation direction switching control is possible.

[0035] Further, in a powerful multi-layer disc, each recording layer is separated from the plurality of recording layers (2-2). Multiple tracking tracks (GTR, GTR) for tracking control are formed!

OUT IN

A reference servo surface 4 is provided. Therefore, if the positioning on each guide track formed on the reference servo surface 4 is correctly performed, the information is not interrupted even when the recording layer to be read (or recorded) is transferred to another recording layer. Reading can be performed. Therefore, it is easier to manufacture as compared with a multi-layer disc that requires alignment of guide tracks between recording layers.

[0036] In the information recording / reproducing apparatus,

Recording layer 2: Guide track GTR

1 OUT

Recording layer 2: Guide track GTR

2 IN

Recording layer 2: Guide track GTR

3 OUT

Recording layer 2: Guide track GTR

4 IN

The recording layer 2: guide track GTR is assigned to perform tracking control during recording or playback.

1 IN

Recording layer 2: Guide track GTR

2 OUT

Recording layer 2: Guide track GTR

3 IN

Recording layer 2: Guide track GTR

4 OUT

It is also possible to perform tracking control during recording or playback with such an assignment.

In short, the guide tracks to be assigned are different between the recording layers adjacent to each other.

[0038] Further, the guide tracks to be assigned in the recording layers adjacent to each other as described below may be the same.

[0039] Recording layer 2: guide track GTR

1 OUT

Recording layer 2: Guide track GTR

2 OUT

Recording layer 2: Guide track GTR

3 IN

Recording layer 2: Guide track GTR

4 IN

At this time, when recording or reproducing sequential information data across a plurality of recording layers, the information recording / reproducing apparatus is configured to connect odd-numbered recording layers or even-numbered recording layers. Recording or reproduction between recording layers. For example, for all areas of recording layer 2

1

When the recording of information data is completed, the next step is to move to the recording operation for recording layer 2.

Three

is there. Thus, even if the recording tracks adjacent to each other have the same form of guide track, there is no interruption even when the recording layer to be recorded (or read) is transferred to another recording layer. It is possible to record (or read) information.

[0040] The lead-in area of the multi-layer disc shown in FIGS. 1, 8, and 10 to 12 includes the guide track form (GTR or GTR) to be assigned to each recording layer as described above,

IN OUT

In addition, recording / reproduction management information indicating the recording or reproduction order for each recording layer is recorded in advance. That is, the information recording / reproducing apparatus reads the recording / reproducing management information from the lead-in area first and executes the recording / reproducing management information based on the recording / reproducing management information when recording or reproducing the information data on the multilayer disc as described above. Such information data is recorded or reproduced.

In the above embodiment, the sampled servo areas SA and SA are dispersed on the guide tracks GTR and GTR of the reference servo surface 4 as shown in FIG.

IN OUT IN OUT

The SA and SA are connected to the intersection of the guide tracks GTR and GTR.

IN OUT IN OUT

It may be arranged in succession.

FIG. 6 is a diagram showing the positional relationship of each of the sampled servo regions on the reference servo surface 4 made in view of the points to be applied.

[0043] The reference servo surface 4 shown in FIG. 6 is formed on the recording layer 2 (or 2) as in FIG.

1 3 Guide track GTR with the same spiral shape as the recording track TR

OUT OUT

), And a gas having the same spiral shape as the recording track TR formed on the recording layer 2 (or 2).

2 4 IN

An id track GTR (shown in broken lines) is formed. These guide tracks GTR and

IN OUT

A sampled servo area SAS indicated by △ is located at each crossover of the GTR.

IN

FIG. 7 is a diagram showing a configuration in the sampled servo area SAS to be applied.

[0045] As shown in FIG. 7, at the beginning of the sampled servo area SAS, a plurality of synchronization pits P are used so that the reading can be performed even in the tracking servo off state.

SYNCs are aligned on the same disk radius line. Distance L1 from profitable synchronous pit P

SYNC

A clock pit P is formed at a position on the guide track GTR separated by

OUT CLK Furthermore, the position of the clock pit P on the guide track GTR relative to the position of the clock pit P

CLK OUT

A bull pit P and an address pit row P are formed respectively. That is, synchronous pit P

WB AD

At the position on the guide track GTR separated by the force distance L1, the sump as described above

SYNC OUT

Servo patterns (P, P, P) that bear the old servo area SA are formed

OUT CLK WB AD

is there. Also, the synchronous pit P force is not on the position on the guide track GTR separated by the distance L2.

SYNC IN

A clock pit P is formed, and further, a gait based on the position of the clock pit P is used.

CLK C and K id track The wobble pit P and the address pit row P are formed at the position on the GTR.

IN WB AD

It is. That is, the synchronous pit P force is also on the guide track GTR separated by the distance L2.

SYNC IN

At the position of the servo pattern (P, P) that bears the sampled servo area SA as described above.

IN CLK WB

P) is formed.

AD

[0046] Thus, in the sampled servo area SAS, the guide tracks GTR and GTR

OUT IN

Sampled servo area SA corresponding to the guide track GTR, with the intersection as a boundary,

OUT OUT

And sampled servo areas SA corresponding to the guide track GTR

IN IN

-ing

[0047] Therefore, an information recording / reproducing apparatus for recording and reproducing information data with respect to a multi-layer disc as shown in FIG. 6 and FIG. 7 has a recording layer 2 or 2 as a recording or reading target.

13

After reading the synchronization pit P, the time corresponding to the distance L1 as shown in Fig. 7 has elapsed.

SYNC

Servo pattern (P, P, P) read at the moment corresponds to the guide track GTR

CLK WB AD OUT

Detected as a servo pattern. And the clock pit P in this servo pattern

C

And tracking control is executed according to wobble pit P. Powerful tracking system

LK WB

As a result, the combined laser beam from the objective lens 16 follows the guide track GTR.

OUT

Irradiated on this guide track GTR. Therefore, the recording layer 2

OUT

Or whether the information data recorded along the two recording tracks TR is on the inner circumference side of the disc.

1 3 OUT

Are sequentially read toward the outer periphery. On the other hand, recording layer 2 or 2 is targeted for recording or reading.

twenty four

In this case, the information recording / reproducing apparatus reads the synchronization pit P and then reads it as shown in FIG.

SYNC

Servo pattern (P, P) read when the time corresponding to distance L2 has elapsed

CLK W

, P) are detected as servo patterns corresponding to the guide track GTR. And this

B AD IN

Depending on clock pit p and subsequent wobble pit P in servo pattern

CLK WB Tracking control. Through powerful tracking control, the synthesized laser beam from the objective lens 16 follows the guide track GTR and irradiates the guide track GTR.

IN IN

Is done. Therefore, along recording track TR of recording layer 2 or 2,

2 4 IN The recorded information data is read sequentially from the outer periphery to the inner periphery.

[0048] In the above embodiment, both the guide tracks GTR and GTR are combined into one re-

OUT IN

Forces to be formed on the reference servo surface 4 Each may be formed on a dedicated reference servo surface.

FIG. 8 is a diagram showing another cross-sectional configuration of the multilayer disk made in view of the points to be applied.

[0050] In the multilayer disc shown in FIG. 8, the transparent protective layer 1, the recording layers 2 and 2, and the transparent intermediate layer 3 are connected.

14

This is the same as shown in Fig. 1. However, instead of the single reference servo surface 4 shown in FIG. 1, a first reference servo surface 41 and a second reference servo surface 42 are formed.

[0051] On one surface of the first reference servo surface 41, as shown in FIG.

1 is the same spiral guide track GTR (1) as the recording track TR formed in 2)

3 OUT OUT) On the other hand, the recording track TR formed on the recording layer 2 (or 2) is formed on one surface of the second reference servo surface 42 as shown in FIG. 9 (b).

A guide track GTR (shown by a broken line) having the same spiral shape as 2 4 IN is formed. Manufacturing

IN

If the first reference servo surface 41 and the second reference servo surface 42 cannot be formed in parallel with each other due to the above variation, they are formed at a distance of 10 times or more the interlayer distance variation value. To

An information recording / reproducing apparatus for recording / reproducing information data on / from a multi-layer disc as shown in FIGS. 8 and 9 is shown in FIG. 8 when the recording layer 2 or 2 is a recording or reading target.

13

The guide track GTR formed on the first reference servo surface 41 is the target.

OUT

Execute tracking control. On the other hand, when recording layer 2 or 2 is the target of recording or reading

twenty four

In this case, tracking control is executed with the guide track GTR formed on the second reference servo surface 42 shown in FIG. 8 as a target.

N

[0052] Further, the guide track (GTR) formed on the reference servo surface (4, 41, 42) as described above.

IN

, GTR) is a CLV (Constant Lith) consisting of one spiral track over the entire disk surface.

OUT Near Velocity) method, or CAV (Constant Angular Velocity) method for each zone, the so-called ZONE-CAV method! ,.

[0053] When the number of recording layers mounted on the multi-layer disc is so large that the influence of spherical aberration cannot be eliminated, one recording layer is provided for each number of recording layers not greatly affected by spherical aberration. It may be possible to provide a reference servo surface.

FIG. 10 is a diagram showing a cross section of a multilayer disk made in view of the points to be applied.

In the multilayer disc shown in FIG. 10, the recording layers 2 and 2 and the recording layers 2 and 2

1 2 1 2 A unit in which the corresponding reference servo surface 4 is laminated, recording layers 2 and 2, and these

1 3 4 Units stacked with reference servo surface 4 corresponding to recording layer 2 and 2 are stacked.

3 4 2

It is made.

[0056] In the above embodiment, the guide track GTR is formed in a spiral shape from the inner periphery to the outer periphery of the disc, and is formed in a spiral shape from the outer periphery of the disc to the inner periphery.

O UT

The guide track GTR has a spiral rotation direction that is both clockwise.

IN

Both may be counterclockwise.

In short, the guide track GTR formed in a spiral shape toward the outer periphery of the disc inner peripheral force in one of the right rotation and the left rotation, and the guide track GTR

OUT OUT

It is only necessary to have a guide track GTR formed in a spiral shape from the outer periphery of the disk toward the inner periphery in the same rotational direction.

IN

[0058] In the above embodiment, the force intended for a multilayer disc having a plurality of recording layers (2 to 2) in one disc as shown in Fig. 1 or Fig. 10 is a single recording layer.

14

The present invention can be similarly applied to a multilayer disk having a plurality of recording surfaces therein.

FIG. 11 is a diagram showing a modification of the multi-layer disc shown in FIG. 1 made in view of the points to be applied. FIG. 12 is a diagram showing a modification of the multilayer disk shown in FIG.

[0060] In the multilayer disk shown in FIG. 11, a single disk having a plurality of recording surfaces 20 to 20 is provided.

14

Guide tracks GTR and GTR corresponding to the recording layer 20 and recording surfaces 20 to 20

1 4 OUT IN The reference servo surface 4 is formed in a stacked manner. The multilayer disk shown in FIG. 12 includes a recording layer 20 having recording surfaces 20 and 20, and recording surfaces 20 and 20 respectively.

1 2 1 Reference servo with GTR and GTR corresponding guide tracks

OUT IN Corresponding to surface 4, recording layer 21 with recording surfaces 21 and 21, and recording surfaces 21 and 21, respectively.

1 1 2 1 2 Guide track GTR and reference servo surface 4 on which GTR is formed are stacked.

OUT IN 2 is formed.

In the present invention as described above, a reference servo surface on which a plurality of recording layers (or recording surfaces) and a plurality of tracking control guide tracks each having a different spiral shape are formed is provided on a multilayer disk. To be provided. As a result, manufacturing is easy, and the recording layer (or recording surface) to be recorded (or read) on the recording / reproducing apparatus side is changed to another recording layer (or recording surface). Provided is a multi-layer disc that can be accessed at high speed without the jump operation and the rotation direction switching operation of the spindle motor. Industrial applicability

[0062] The present invention is applied to a multilayer disc in which a plurality of recording layers on which information data is recorded are laminated along a spiral recording track.

Claims

The scope of the claims

[1] A reference servo surface that is a multilayer disk having a plurality of recording layers or recording surfaces on which information data is recorded, and in which a plurality of tracking control guide tracks each having a different spiral form are formed in a spiral shape. A multi-layer disc characterized by comprising.

[2] One guide track of each of the guide tracks is formed in a spiral shape toward the outer periphery of the disk inner periphery in one rotation direction of right rotation and left rotation. 2. The multi-layer disc according to claim 1, wherein the other guide track in each of the tracks is formed in a spiral shape from the outer periphery to the inner periphery in the one rotation direction.

[3] The information data is recorded on each recording layer or each recording surface along a recording track having the same spiral form as one of the guide tracks. The multilayer disk according to claim 1, characterized in that:

[4] A first guide track for tracking control, which is a multi-layer disc having a plurality of recording layers or recording surfaces on which information data is recorded and formed in a spiral shape from the inner periphery to the outer periphery of the disc, and And at least one reference servo surface provided with a second guide track formed in a spiral shape from the outer periphery of the disk toward the inner periphery in the same rotational direction as the first guide track,

Each of the recording layers or one of the recording surfaces is recorded with the information data along a recording track having the same spiral shape as the first guide track, and each of the recording layers or the recording surface is recorded. The multi-layer disc is characterized in that the information data is recorded along a recording track having the same spiral form as the second guide track on the other one of the recording surfaces.

5. The multilayer disc according to claim 4, wherein a plurality of sampled servo areas are distributed along each of the first guide track and the second guide track.

6. The multilayer disk according to claim 4, wherein the sampled servo area is formed with synchronization pits that serve as a synchronization reference during recording and reproduction.

7. The multilayer according to claim 4, wherein an identification pit indicating whether the first guide track and the second guide track belong to a deviation is formed in the sampled servo area! disk.

[8] A multi-layer disc having a plurality of recording layers or recording surfaces for recording information data, comprising a first guide track for tracking control formed in a spiral shape from the inner periphery to the outer periphery of the disc The first reference servo surface;

A second reference servo surface having a second guide track formed in a spiral shape from the outer periphery of the disk toward the inner periphery in the same rotational direction as the first guide track, The information data is recorded along a recording track having the same spiral form as the first guide track in one of each or each recording surface, and each recording layer or each recording surface is recorded. The other one of the multi-layer discs is characterized in that the information data is recorded along a recording track having the same spiral form as the second guide track.

[9] The first reference servo surface and the second reference servo surface are formed at a distance of 10 times or more a variation value of an interlayer distance in manufacturing. 8. Multilayer disc according to 8.

[10] A plurality of recording layers or recording surfaces on which information data is recorded, a first guide track for tracking control formed in a spiral shape from the inner periphery to the outer periphery of the disc, and the first guide track A multi-layer disc in which at least one reference servo surface on which a second guide track for tracking control is formed in a spiral shape from the outer periphery to the inner periphery in the same rotation direction is laminated. An information recording / reproducing apparatus for recording and reproducing information data with respect to

An optical system for irradiating the reference servo surface with a second laser beam for tracking control while irradiating the first recording beam for recording or reading the information data on each of the pre-recording layers or one of the recording surfaces. Head,

Tracking control means for performing tracking control on the optical head so that the second laser beam irradiates one of each of the first guide track and the second guide track. Playback device.

[11] When the recording layer or recording surface to be recorded or read is transferred to another recording layer or recording surface, the first recording layer or recording surface is irradiated with the first laser beam and the first recording layer or recording surface is irradiated with the first laser beam. 11. The information according to claim 10, further comprising recording layer moving means for controlling the optical head to irradiate the other of each of the first guide track and the second guide track with two laser beams. Recording / playback device.

[12] A plurality of sampled servo areas including identification pits are distributed along each of the first guide track and the second guide track.

An identification means for identifying whether the sampled servo area belongs to the first or second guide track based on reflected light when the second laser beam irradiates the identification pit of the sampled servo area; The information recording / reproducing apparatus according to claim 10, further comprising:

[13] A plurality of sampled servo areas including synchronization pits are distributed along each of the first guide track and the second guide track.

Identification means for identifying whether the sampled servo area belongs to the first or second guide track based on the reflected light when the second laser beam irradiates the synchronous pit of the sampled servo area; The information recording / reproducing apparatus according to claim 10, further comprising:

[14] A plurality of sampled servo areas including synchronization pits are distributed along each of the first guide track and the second guide track.

When the second laser beam is applied to the synchronous pit and a predetermined first time elapses, a sampled servo pattern corresponding to the first guide track is detected from the sampled servo area, and the second laser is detected. The apparatus further comprises means for detecting a sampled servo pattern corresponding to the second guide track from the sampled servo area when a predetermined second time has elapsed since the beam was applied to the synchronous pit. The information recording / reproducing apparatus according to claim 10.

[15] A first reference servo comprising a plurality of recording layers or recording surfaces on which information data is recorded, and a first guide track for tracking control formed in a spiral shape from the inner circumference to the outer circumference of the disc Surface and the outer periphery to the inner periphery in the same rotational direction as the first guide track. Information recording / reproducing apparatus for recording and reproducing information data on a multi-layer disc in which a second reference servo surface having a second guide track for tracking control formed in a spiral shape is laminated. Because

Tracking control is performed on one of the first and second reference servo surfaces while irradiating each of the front recording layer or one of the recording surfaces with a first laser beam for recording or reading the information data. An optical head for irradiating a second laser beam for