JP3431752B2 - Optical disk medium and optical disk device - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an optical disc medium and an optical disc device.

[0002]

2. Description of the Related Art In recent years, an optical disk medium has been developed as a large-capacity recording medium, and a typical example thereof is a CD (Compa
ct Disk) has been put to practical use. This is a read-only recording medium that records audio signals as digital data.
Currently, a CD-WO that allows additional recording of digital data
(CD-Write Once), digital data can be rewritten C
D-RAM (CD-Random Access Memory) and the like have been put into practical use.

In such an optical disc medium capable of recording data, a groove indicating the position of a track for recording data is formed in advance. As shown in FIG. 3, the recording / reproducing system of such an optical disc medium is roughly classified into a CLV system and a CAV (Constant Angular Velocity) system, and a ZCLV system and a ZCAV (Zone CAV) system to which this system is applied.
There is also a method.

In the CLV system, the optical disc medium is rotationally driven at a constant linear velocity, so that data management and control of the rotational velocity are somewhat complicated, but the maximum recording capacity can be secured.
On the contrary, in the CAV method, the optical disk medium is rotationally driven at a constant angular velocity, so that data management and control of the rotational speed are easy, but the recording capacity is sacrificed to some extent. In the ZCLV method, a plurality of zones are set on the optical disk medium, and a substantially constant linear velocity is set between the plurality of zones as in the CLV method, and an angular velocity is constant inside each zone as in the CAV method. Even in the ZCAV system, a plurality of zones are set on the optical disk medium, but like the CAV system, the angular velocity is kept constant and the frequency of recording and reproducing information is varied between the plurality of zones.

An optical disk medium such as a CD adopts the CLV method with priority given to the recording capacity, and an optical disk medium capable of recording information by such a CLV method is formed such that its groove has a meandering shape periodically. There is. That is, CL
In an optical disc medium in which information is recorded / reproduced by the V method, the linear velocity at the position where information is recorded / reproduced is constant, so that address information necessary for such rotation control is superposed on the groove by wobbling. There is.

[0006] For example, an optical disc medium 1 such as a CD-WO
In this case, as shown in FIG. 4, since the track on which information is recorded and reproduced is formed in a spiral shape, the grooves 2 to be the track are formed at a predetermined pitch, and the groove 2 corresponds to the address information. Have been wobbled.

When the optical disc apparatus records / reproduces information on / from such an optical disc medium 1, the groove 2 is optically scanned by the optical head. Since this groove 2 is wobbled at a frequency that is probably different from the tracking error, its tracking signal is the tracking error signal and the ATIP (Absolute Time In Pregro
ove) The wobble signal is superimposed.

Therefore, a bandpass filter detects a tracking error signal and an ATIP wobble signal from the tracking signal, and the ATIP wobble signal is FM.
If FM demodulation is performed by a (Frequency Modulation) demodulation circuit, the address information of the absolute time of the track is detected by this FM demodulation signal. If the track address information is found in this manner, the optical disk medium 1 is synchronized with the track address information.
Since it is possible to control the rotation speed of the, it is possible to record and reproduce information in the groove 2 that moves at a constant linear speed.

The CLV type optical disk medium 1 as described above has a higher recording density than the CAV type, but a higher density is demanded, and the land & groove type is one method for realizing this. Proposed. This is a method in which the land 3 existing in the gap between the grooves 2 is also used for recording / reproducing information, and the recording density is doubled if simply calculated.

However, as shown in FIG. 4, the address information can be recorded in the groove 2 by the wobbling, but the address information by the wobbling cannot be recorded in the land 3 which is only the gap. Because of this, Land &
In a groove type optical disk medium (not shown), address information is recorded on a land and a groove by a method different from wobbling. That is, the pits of the address information are pre-formatted in the lands and the grooves, and the pits can detect the address information of the lands and the grooves.

[0011]

Since the land-and-groove type optical disc medium described above can record information on both the land and the groove, the recording density can be dramatically improved.

However, in reality, it is necessary to preformat the pits of the address information in the land and the groove as described above, and it is difficult to shorten the track pitch with such a structure for manufacturing reasons. is there. Therefore, the actual land & groove type optical disc medium is
The recording density is not so much improved as compared with the optical disc medium in which the track pitch cannot be shortened and the information is recorded only in the groove to shorten the track pitch. Further, pre-formatting the address information as described above also impairs the productivity of the optical disc medium.

[0013]

[0014]

According to a first aspect of the present invention, there is provided an optical disc device in which an optical disc medium having grooves wobbled corresponding to address information is rotationally driven by a rotational drive mechanism to optically rotate the groove of the optical disc medium. by optically scanning detects address information by wobbling the head, in the optical disc apparatus for controlling the rotational speed of the optical disc medium in accordance with the address information, Group
Address storage means for temporarily storing the address information of the
It is provided to record and reproduce information on the adjacent groove and land.
Groove address information that was executed alternately and temporarily stored
Address that outputs as the address information of the adjacent land.
The scan output means is provided, thereby substituting the groove address information adjacent address information of the land. Therefore, since information can be recorded on both the land and the groove of the optical disc medium, the recording density of the optical disc medium can be dramatically improved. In this case, the land, which is the gap between the grooves, cannot overlap the address information due to wobbling, but since this is substituted by the address information of the adjacent groove, the address information can be detected without requiring prepits. The recording / reproducing of information in the present invention means executing at least one of recording and reproducing of information. Also, information recording / reproduction is adjacent
Since it is executed alternately for the groove and the land,
Immediately after recording / reproducing information to / from the ringed groove
In addition, recording / reproduction of information on the land not wobbled
The address information of this land is directly corrected.
You can substitute the address information of the previously accessed groove.
It In addition, the address information of the groove is temporarily stored.
A dress memory means is provided to add the temporarily stored groove
Output the address information as the address information of the adjacent land.
Since there is an address output means for recording information in the groove.
Address information is temporarily stored when recording / playback is executed.
To record and reproduce information on the next land, the temporarily stored group
The address information of the probe is used.

[0015]

[0016]

According to a second aspect of the invention, in the first aspect of the invention, there is provided rotation control means for controlling the rotation speed of the optical disc medium by the CLV system or the ZCLV system. Therefore, since the linear velocity for recording / reproducing information on / from the optical disc medium is substantially constant, the recording / reproducing of information can be performed at a high density, and the control of the rotation velocity of the optical disc medium in the case of performing recording / reproducing of information on the land is performed by the It is executed according to the address information.

According to a third aspect of the present invention, in the second aspect of the invention, the rotary drive mechanism is provided with an encoder for detecting the rotation state of the optical disc medium and outputting it to the rotation control means. Therefore, the rotation speed of the optical disk medium is detected by the encoder, and this rotation speed is CL.
Feedback control is performed by the V method or the ZCLV method.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. Note that, regarding the present embodiment, the same parts as those of the above-described one conventional example are denoted by the same names and reference numerals, and detailed description thereof will be omitted.

Optical disc system 11 of the present embodiment
2 comprises an optical disk medium 12 and an optical disk device 13, as shown in FIG. As shown in FIG. 1, the optical disk medium 12 has grooves 2 in which address information is recorded by wobbling, which are formed at a constant pitch, and lands 3 located between the grooves 2 are not wobbled. However, the optical disk medium 12 is formed as a land and groove system in which information is recorded on both the land 3 and the groove 2, and its rotation control is based on the CLV system.

The optical disk device 13 for recording / reproducing information on / from the optical disk medium 12 mainly comprises a rotation drive mechanism 14, an optical head 15, a head control circuit 16, a rotation control circuit 17 corresponding to a rotation control means, and the like. It has as a part. The rotation drive mechanism 14 is used for the optical disc medium 1.
2, a turntable 18 for holding 2, a spindle motor 19 for rotationally driving the turntable 18, an encoder 20 for detecting a rotation state of the spindle motor 19,
As described in detail later, the optical disk medium 12 is rotationally driven by the CLV method.

The optical head 15 has a laser light source, an objective lens, a beam splitter, a light receiving element, etc.,
Recording / reproduction of information is optically performed on the optical disc medium 12. The optical head 15 is supported by a sledge mechanism so as to be movable in the tracking direction. Inside the optical head 15, the objective lens is supported by a tracking mechanism and a focusing mechanism so as to be displaceable in each direction.

The head control circuit 16 is connected to the optical head 15 and executes various information processing related to recording / reproducing of information by the optical head 15. That is, the output signal of the light receiving element is detected, and the laser light source, the sledge mechanism, the tracking mechanism, and the focusing mechanism are drive-controlled. For example, at the time of recording information, while performing tracking control and focusing control, the optical head 1 corresponding to the information to be recorded is recorded.
The laser light source of No. 5 is driven. Similarly, at the time of reproducing information, the output signal of the light receiving element of the optical head 15 is decoded while tracking control and focusing control are being executed.

The head control circuit 16 executes recording / reproducing of information by the optical head 15 as described above not only on the groove 2 but also on the land 3 of the optical disk medium 12.
More specifically, the head control circuit 16 is set so that recording and reproduction of information by the optical head 15 are alternately performed on the adjacent groove 2 and land 3 of the optical disk medium 12, and the address information of the land 3 is set. Is replaced with the address information of the immediately preceding groove 2. Therefore, a memory is provided as an address storage unit that temporarily stores the address information of the groove 2 in correspondence with the rotation angle of the optical disc medium 12, and the temporarily stored address information is used as the address information of the adjacent land 3 in the optical disc medium. There is also provided address output means for outputting corresponding to 12 rotation angles.

The rotation control circuit 17 is connected to the head control circuit 16, the encoder 20 and the spindle motor 19, and receives the address information input from the head control circuit 16 and the encoder 20. The rotation speed of the spindle motor 19 is controlled by the CLV method according to the pulse signal. More specifically, the rotation control circuit 17 uses a PLL (Phase Locked Lo).
op) circuit, generates a target speed for rotational drive of the optical disk medium 12 from address information input from the head control circuit 16, and determines a rotational speed of the spindle motor 19 detected by the encoder 20. Match the target speed with PLL control.

In the optical disc system 11 of this embodiment having such a configuration, the optical disc medium 12 can be loaded in the optical disc device 13 in an exchangeable manner, and the optical disc device 1 thus loaded can be used.
3, recording and reproduction of information can be performed.

In this case, the optical disc medium 12 is rotationally driven by the rotational drive mechanism 14 of the optical disc device 13, and the optical head 15 executes recording / reproducing of information in the groove 2 of the optical disc medium 12 which is initially rotating. At this time, the optical head 1 that optically scans the wobbled groove 2
Since the head control circuit 16 detects the tracking signal and the focusing signal from the output signal of 5, the optical head 15 is caused to follow the groove 2 in accordance with these signals.

At the same time, the head control circuit 16 detects the address information from the tracking signal and outputs it to the rotation control circuit 17, and the encoder 20 detects the rotation state of the spindle motor 19 and outputs it to the rotation control circuit 17. The rotation control circuit 17 controls the spindle motor 1 so that the linear velocity of the optical disk medium 12 with respect to the optical head 15 becomes constant.
The rotation speed of 9 is feedback-controlled by the CLV method.

Further, the head control circuit 16 includes the groove 2
The address information detected from the above is temporarily stored for one round corresponding to the rotation angle of the optical disk medium 12, and when this one round of optical scanning is completed, the optical scanning of the adjacent land 3 is started.

In this case, since the land 3 is not wobbled, the head control circuit 16 cannot detect the address information, but the address information of the groove 2 temporarily stored immediately before this is output corresponding to the rotation angle of the optical disk medium 12. Therefore, the rotation control circuit 17 can drive and control the rotation drive mechanism 14 by the CLV method as in the case of the groove 2. When the optical scanning of one round of the land 3 is completed, the optical scanning of the adjacent groove 2 is started, and its address information is overwritten on the address information temporarily stored at the front.

Similarly, since information is recorded / reproduced on / from the groove 2 and the land 3 of the optical disk medium 12,
This is a land and groove system with high recording density. Moreover, since the rotation speed is controlled by the CLV method in which the linear velocity of the optical disk medium 12 is kept constant with respect to the optical head 15, information can be recorded at a higher density.

In this CLV method, address information is required for rotation control, and the address information cannot be superimposed on the land 3 which is the gap between the grooves 2 by wobbling. However, in the optical disk system 11 of the present embodiment, as described above, the land information is used. The address information of No. 3 is substituted by the address information of the groove 2 optically scanned immediately before. Therefore, since the land 3 and the groove 2 do not require prepits for address information, the pitch between the groove 2 and the land 3 can be shortened to improve the recording density, and the optical disc medium 12 can be manufactured easily and with high productivity. It is good. The optical disc device 13 is
Since the adjacent groove 2 and land 3 are alternately optically scanned, the address information of the land 3 can be properly acquired by a simple operation.

Here, the rotation control of the optical disk medium 12 by the optical disk device 13 is exemplified to be performed by the CLV method, but it is also possible to use the ZCLV method. Even in the ZCLV method, the address information is required to control the rotation of the optical disk medium 12, but since the address information of the land 3 can be obtained from the groove 2 as described above, the information recording can be performed with high density.

[0034]

[0035]

According to the optical disk device of the first aspect of the present invention, the information can be recorded on both the land and the groove of the optical disk medium by recording and reproducing the information on both the groove and the land of the optical disk medium. Therefore, since the recording density is high and the address information of the land can be substituted by the address information of the adjacent groove, the land and the groove of the optical disk medium do not need the prepits of the address information, and the pitch between the land and the groove of the optical disk medium is not required. It is possible to improve the recording density by improving the recording density as well as the productivity, and it is possible to execute the rotation control by the CLV system or the ZCLV system without using pre-pits while using the land & groove system. Also of information
Alternate recording / playback to adjacent grooves and lands
Information on the wobbled groove.
Immediately after the recording / playback is performed, the unwobbled
Since information will be recorded and played back on the
The land address information of the groove that was accessed immediately before
Address information can be easily substituted. further,
Address memorizer that temporarily stores groove address information
A step is provided so that the address information of the temporarily stored groove can be
Address output that is output as the address information of the land that touches
By providing the force means, the groove alignment can be performed easily.
Substitute dress information as land address information
You can

[0036]

[0037]

In the optical disk device of the second aspect of the present invention, the control of the rotational speed of the optical disk medium is performed by the CLV system or Z
Since the rotation control means for executing the CLV method is provided, the address information necessary for the rotation control of the CLV method or ZCLV method can be easily detected.
The recording density can be improved by the LV method.

In the optical disk device according to the third aspect of the present invention, the rotation speed of the optical disk medium is measured in real time by providing the rotary drive mechanism with the encoder that detects the rotation state of the optical disk medium and outputs it to the rotation control means. Therefore, this can be easily controlled according to the address information.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing the shapes of lands and grooves of an optical disc medium according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing an optical disc medium and an optical disc device.

FIG. 3 is an explanatory diagram showing various methods of rotation control of an optical disc medium.

FIG. 4 is a schematic view showing the shapes of lands and grooves of an optical disc medium of a conventional example.

[Explanation of symbols]

2 groove 3 land 12 Optical disc media 13 Optical disk device 14 Rotational drive mechanism 15 Optical head 17 Rotation control means 20 encoder

Continuation of the front page (56) Reference JP-A-7-14172 (JP, A) JP-A-7-129964 (JP, A) JP-A-4-38633 (JP, A) JP-A-6-290465 (JP , A) JP 6-274896 (JP, A) JP 7-57302 (JP, A) JP 7-262685 (JP, A) JP 2867236 (JP, B2) (58) Fields investigated ( Int.Cl. ⁷ , DB name) G11B 7/00-7/30, 19/28

Claims (3)

(57) [Claims] 1. An optical disk medium in which a groove is wobbled corresponding to address information is rotationally driven by a rotary drive mechanism, a groove of a rotating optical disk medium is optically scanned by an optical head, and address information is detected by wobbling. an optical disk apparatus for controlling the rotational speed of the optical disc medium in accordance with the address information, glue
Address storage means for temporarily storing the address information of the
However, information recording / playback is exchanged between the adjacent groove and land.
Mutually execute the temporarily stored groove address information.
Address output as address information of adjacent land
An optical disk device, characterized in that output means is provided so that the address information of a land is substituted by the address information of an adjacent groove. 2. CL for controlling the rotational speed of an optical disk medium
V (Constant Liner Velocity) method or ZCLV (Zone CLV)
2. The optical disk device according to claim 1, further comprising rotation control means for executing the method. 3. The optical disk apparatus according to claim 2 , wherein the rotary drive mechanism is provided with an encoder that detects the rotational state of the optical disk medium and outputs it to the rotation control means.