JPH097231A - Information recording disk and information recording / reproducing device - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain an information recording disk which has less crosstalk, is suitable for higher density, and can be used for the existing information arrangement architecture of a disk having one spiral. [Structure] In an information recording disc, one spiral recording track that makes a plurality of revolutions is formed on a disc-shaped recording medium,
Guide grooves are formed every other turn of the spiral. [Effect] Information can be recorded both on the guide groove and between the guide grooves, so the density can be increased by the crosstalk reduction effect of the land and groove, and since there is only one spiral, continuous tracking is possible, and recording / reproduction is possible. Information is not interrupted and device access time does not increase. Since it is possible to use the existing information allocation architecture based on a single spiral disk, new technology development and investment can be reduced, and it is also excellent in compatibility with existing systems. There is.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording disk such as an optical disk and an information recording / reproducing apparatus for driving the information recording disk to optically record / reproduce information.

[0002]

2. Description of the Related Art Usually, one spiral is formed on an optical disk. For example, a compact disc (C
In a pre-mastered disc such as D), there are differences such as an intermittent pad row, and in a recordable optical disc, in principle, a continuous guide groove, but in each case, one spiral was orbited many times. It has a structure. Then, in order to increase the density of the disk, the pitch of this spiral may be narrowed.

However, when the pitch is narrowed, naturally, crosstalk becomes a problem. As one method of solving such a problem and realizing high density of the disc, recording is performed both in the guide groove (guide groove: groove) and between the guide grooves (between guide grooves: land). A method has been proposed in which the track density is doubled from the conventional one to achieve higher density. Especially, if the depth of the guide groove is set to a predetermined value, the crosstalk between the information mark recorded on the groove and the information mark recorded between the adjacent grooves becomes small, and high density recording becomes possible. Naru (OPTRONICS 199
4. No. 5, p. 122 to p. 126, "High Density of Phase Change Optical Disk by Land & Groove Recording").

However, this method requires two spirals. Further, as another method for increasing the density of the disc, a sub-spot is arranged at a position displaced by a 1/2 track pitch from the main spot, and the polarity of the tracking error signal of the main spot is switched so that the groove or A method of tracking between the grooves is also known (Japanese Patent Laid-Open No. 7-14172). In this system, the groove is meandering, so the main spot is
The meandering information is read from the main spot when tracking along the groove, and from the sub-spot when tracking between the grooves.

Therefore, it is necessary to read the meandering information (rotation control information and address information) of the meandering groove from between the grooves.
Multiple light spots will be used. The reason is 1
With only one light spot, even if one meandering information, for example, meandering information when tracking on a groove is obtained,
This is because the meandering information cannot be obtained when tracking between the other grooves.

In this method, if tracking is performed between the grooves, the meandering information cannot be read forever, and rotation control and recording data timing management cannot be performed. Therefore, a plurality of light spots are used to read the meandering information on and between the grooves. However, the apparatus for forming a plurality of spots becomes complicated and expensive, and the sub-spots can be accurately divided into 1 /
It is practically difficult to dispose them at positions displaced by two tracks.

[0007]

DISCLOSURE OF THE INVENTION Discoid recording media such as optical discs have a guide groove (guide groove:
By recording both in the groove) and between the guide grooves (between the guide grooves: lands), the first method that doubles the track density compared with the conventional method, or only 1/2 track pitch with respect to the main spot Place the sub-spots at offset positions,
A second method for tracking on or between grooves by switching the polarity of the tracking error signal of the main spot has been conventionally known. First, the first
In the method, since the pitch of the guide groove itself is also recorded in the “second spiral” between the grooves, the same effect as halving the pitch can be obtained in terms of density and the cross It also has the effect of reducing talk.

However, since it has two spirals, it is necessary to return to the head of the second spiral after the reading of the first spiral is completed. Therefore, for example, when music or a moving image is recorded, the sound or image is interrupted between the end of the first line and the beginning of the second line.
There is a problem. For example, if the spiral starts from the inner circumference, in order to move the head from the end of the first head to the position of the second head, the distance from the outermost circumference to the innermost circumference of the disk must be moved. I won't.

Since this moving distance is long, it takes a long time, and sound and images are interrupted during that time. As an even bigger problem, in the optical discs that are currently the mainstream such as CD-ROM and MO, the information on the disc is
Optimal arrangement is based on the assumption of one spiral.

When such disc information is copied as it is to the disc having the two spirals, the information is copied over the first and second spirals. As a result, there is a disadvantage that not only the first optimum information arrangement is separated, but also an extra head access occurs.

That is, in a disc having two spirals, there is an optimum information arrangement different from the case of one disc, and it is necessary to construct an information arrangement architecture for that purpose. As described above, since the optimum information arrangement is different between a disc having one spiral and a disc having two spirals, a disc having one spiral is changed to a disc having two spirals. Optimal information arrangement cannot be obtained by simple copying of information.

As a result, since the information arrangement architecture is different between the case of one spiral and the case of two spirals, it is remarkable to maintain compatibility with the existing architecture based on one spiral. There are difficulties.
The above is the outline of the contents of the first method of the related art.

Next, in the second method, a plurality of light spots are used to read the meandering information on and between the grooves. Therefore, the apparatus becomes complicated and the cost increases, and there are many difficulties in accurately arranging the sub-spots at positions displaced by 1/2 track pitch.

It is an object of the present invention to provide a recording / reproducing system having a high density and excellent compatibility with existing systems. Therefore, an information recording disk with less crosstalk, suitable for higher density, and capable of utilizing the existing information arrangement architecture of a disk having one spiral is realized (the invention of claims 1 to 4). ).
Further, with respect to this information recording disk, it is possible to realize an information recording / reproducing apparatus capable of continuously tracking the track and having a simple and inexpensive structure (inventions 5 to 8).

[0015]

According to the first aspect of the present invention, one spiral recording track that makes a plurality of turns is formed on a disk-shaped recording medium, and guide grooves are formed every other turn of the spiral.

According to a second aspect of the present invention, in the information recording disk of the first aspect, in the vicinity of the boundary from the spiral in which the guide groove is formed to the spiral in which the guide groove is not formed,
An optically detectable flag is formed at a position different from the spiral line.

According to the third aspect of the invention, in the information recording disk of the second aspect, the position where the flag is formed is a position separated from the spiral line by about 1/2 of the spiral pitch.

According to a fourth aspect of the invention, in the information recording disk according to the first to third aspects, the guide groove is meandered in the radial direction at a constant spatial frequency or a spatial frequency frequency-modulated with address information. .

According to another aspect of the present invention, a spiral recording track is formed on a disc-shaped recording medium, and one spiral recording track that makes a plurality of revolutions is formed, and the spiral recording track is formed on an information recording disc in which guide grooves are formed every other revolution of the spiral. In an information recording / reproducing apparatus that records / reproduces information with respect to a recording medium, a tracking error is detected by detecting a positional deviation between a head that condenses a light beam on a recording medium to form a light spot and a light spot and a spiral recording track. The tracking control means includes a tracking error signal generating means for generating a signal and a tracking control means for correcting the position of the light spot according to the tracking error signal and controlling the light spot to follow the spiral recording track. ,
The polarity of the tracking error signal is inverted between the spiral winding in which the guide groove is formed and the spiral winding in which the guide groove is not formed, and control is performed so that the light spot continuously tracks the spiral recording track.

According to a sixth aspect of the present invention, in the information recording / reproducing apparatus of the fifth aspect, a light amount detecting means for detecting the reflected or transmitted light amount of the light spot is provided, and the polarity of the tracking error signal is inverted according to the light amount, The light spot is controlled so as to continuously follow the spiral recording track.

According to a seventh aspect of the invention, in the information recording / reproducing apparatus of the fifth aspect, the information recording disk is on a spiral line near the boundary from the spiral in which the guide groove is formed to the spiral in which the guide groove is not formed. An optically detectable flag is formed at a position different from that, and the tracking control means detects the flag and inverts the polarity of the tracking error signal.

According to another aspect of the present invention, a spiral recording track is formed on a disc-shaped recording medium, and a spiral recording track that makes a plurality of revolutions is formed, and a spiral recording track is formed on an information recording disc in which guide grooves are formed every other revolution of the spiral. In the information recording / reproducing apparatus for recording / reproducing information, the guide groove meanders in the radial direction at a constant spatial frequency or a spatial frequency frequency-modulated by address information.
A rotation motor that rotates the disc-shaped recording medium, a guide groove meandering detection unit that detects a guide groove meandering signal according to the rotation of the disc-shaped recording medium, and rotation control of the rotation motor based on the frequency of the meandering signal A rotation control means is provided, and the rotation control means holds the control state in the immediately preceding revolution in the spiral revolution in which the guide groove is not formed.

[0023]

In the information recording disk of the present invention, compatibility with an optical disk having one spiral formed on the currently mainstream disk is emphasized, and in addition, in order to achieve high density, the groove ( Both the guide groove) and the land (between the guide grooves) are used as the recording tracks, and the groove and the land are provided every other circumference of the spiral, so that a track density twice that of the conventional one can be ensured, and the cross can be achieved. Talk is also prevented (the inventions of claims 1 to 4). Further, there is proposed an information recording / reproducing apparatus capable of continuously tracking the track of the information recording disk having such one spiral formed (the invention of claims 5 to 8).

[0024]

[Information Recording Disc of Embodiment 1] An information recording disc and an information recording / reproducing apparatus of the present invention will be described with reference to the drawings.
The embodiment will be described in detail. This embodiment mainly corresponds to the invention of claim 1, but is also related to the inventions of claims 2 to 8, and the invention of claim 1 is the basic invention.

The inventions of claims 1 to 4 relate to an information recording disk, and the inventions of claims 5 to 8 claim 1.
The invention relates to an information recording / reproducing apparatus for driving each information recording disk according to claim 4. The first embodiment is characterized in that one spiral recording track is formed and guide grooves are formed every other circumference of the spiral.

FIG. 1 is a view conceptually showing one embodiment of the spiral structure of the recording track of the information recording disk of the present invention. In the figure, the solid line 1 is a groove, the broken line 2 is a land, and G is a groove (guide groove).
G (n) and G (n + 1) are each one groove G,
L is a land (between the guide grooves), and L (n), L (n +
1) shows each one land L, A shows a partial area of the disk-shaped recording medium, arrow B shows the rotation direction, and C shows the rotation center position of the disk-shaped recording medium.

As shown in FIG. 1, spirals are arranged on the disk-shaped recording medium from the rotation center position C toward the outside or from the outside toward the inside. This spiral has a turn in which a groove (guide groove) G shown by a solid line 1 is formed and a land (between guide grooves) L shown by a broken line 2 in each spiral, that is, a turn in which nothing is formed. And are arranged alternately.

FIG. 2 is an enlarged view of a partial area A on the disk-shaped recording medium shown in FIG. The reference numerals in the figure are the same as those in FIG. 1, the arrow D indicates the spot scanning direction, and E indicates one spiral pitch.

FIG. 3 is an enlarged sectional view of a partial area A on the disk-shaped recording medium shown in FIG. Reference numerals in the figure are the same as those in FIG. 1, and 3 indicates a substrate (disk substrate) of a disk-shaped recording medium.

An enlarged view of a part of the area A in FIG. 2 and FIG.
As shown in the enlarged cross-sectional view of FIG.
(N) becomes the land L (n) in the next turn. Further, this land L (n) will have a groove G in the next turn.
(N + 1), and similarly, grooves and lands are arranged like L (n + 1). Therefore, the distance between a certain guide groove and the adjacent guide groove is twice the spiral pitch. The information recording disk of this invention is shown in FIG.
As shown in FIG. 2, the circumference in which the guide groove of the groove G shown by the solid line (1) is formed and the land L shown by the broken line (2), that is,
The orbits on which nothing is formed are arranged alternately to form a spiral shape.

In this disc-shaped recording medium, when viewed in the radial direction, the grooves G and the lands L are alternately present, so that the same crosstalk reduction effect as the first method described above as the conventional example can be obtained. It is arranged to be obtained. Therefore, recording can be performed on both the land L and the groove G, and high density can be achieved. Also, when viewed in the spiral direction, since it is a continuous spiral, it is possible to use the existing information arrangement architecture for a disk having a single spiral, and to maintain compatibility with existing systems. It is also excellent in terms.

As described above, in the first embodiment, one spiral recording track (land L) that makes a plurality of turns is formed on the disk-shaped recording medium, and the guide groove (groove) is formed at every other turn of this spiral. G) is formed. An information recording / reproducing apparatus suitable for driving the information recording disk described with reference to FIGS. 1 to 3 will be described in detail in another section as another embodiment (second of the first embodiment) (claim). (Item 5 information recording / reproducing apparatus).

[0033]

[Information recording / reproducing apparatus of the first embodiment] This embodiment corresponds to the inventions of claims 5 and 6, and is one formed on the information recording disk previously described in the first embodiment. This is an information recording / reproducing apparatus capable of continuously tracking spiral tracks.

FIG. 4 is a functional block diagram showing an embodiment of the main configuration of the information recording / reproducing apparatus of the present invention. In the figure, 11 is an information recording disk of the present invention, 1
2 is a head, 13 is an inverting amplifier, 14 is a selector, 15
Is a servo circuit, 16 is a comparator, LB is a light beam,
TE is a tracking error signal, SUM is a light amount signal, E
Indicates a reference voltage.

The information recording disk 11 shown in FIG. 4 is rotated by a rotary motor (not shown). Head 12
The light beam LB is focused on the information recording disk 11 to form a light spot, and the tracking error signal TE and the light amount signal SUM are generated by the reflected light from the information recording disk 11. As such a signal generating means, a conventionally known one is used.

FIG. 5 is a functional block diagram showing a main configuration of a signal detecting section for generating the tracking error signal TE and the light quantity signal SUM in the information recording / reproducing apparatus. Reference numerals in the drawings are the same as those in FIGS. 3 and 4, and 21 is an objective lens, 22 is a two-division optical sensor, 23 is a subtractor, and 24 is an adder.

As shown in the lower part of FIG. 5, the tracking error signal TE is a sum signal by the difference signal from the optical sensor (two-division optical sensor) 22 divided into two in parallel with the spiral on the information recording disk 11. Light signal SU
M is obtained respectively. In addition, in FIG.
The sectional view of a part of the area A of the information recording disk 11 shown in FIG. Next, the groove G and the land L of the information recording disk 11 and the two generated signals, that is, the tracking error signal TE and the light amount signal SUM.
Will be described.

FIG. 6 is a diagram showing the relationship between the groove G and the land L and the tracking error signal TE and the light amount signal SUM. Reference numerals in the figure are the same as those in FIGS. 3 and 5, and aa and bb are signal detection timings.
TEaa and TEbb respectively detect timing a-
tracking error signal detected by a, bb, SU
Maa and SUMbb respectively detect timing a-
The light amount signal detected by a, b-b is shown.

A part of the area A of the information recording disk 11 shown in FIG. 3 is the boundary of the spiral orbit, and as described above, the groove G (n) causes the land L (n) in the next orbit.
become. Assuming that the groove G (n) is being tracked and the land L (n) is being tracked, the tracking error signal TE changes from TEaa to TEbb shown in FIG. 6, and its polarity is inverted. In this state, land L (n)
In order to continuously track the top, the tracking error signal TE (TEaa in FIG. 6) may be further inverted.

On the other hand, the sum signal, that is, the light quantity signal SUM
(SUMaa and SUMbb in FIG. 6) have different levels on the groove and the land. In FIG. 6, the case where the level is low on the groove and the level is high on the land is shown. Since the level relationship between the groove and the land changes depending on the depth and width of the groove, the level relationship between the height and the level may be reversed. This level of problem is a matter of choice in the manufacture of information recording discs.

The above is the relationship between the groove G and the land L of the information recording disk 11 and the two generated signals, that is, the tracking error signal TE and the light amount signal SUM. Now, returning to FIG. 4, the information recording / reproducing apparatus is provided with an inverting amplifier 13 to invert the polarity of the tracking error signal TE.

Then, the tracking error signal TE,
One of the inverted signals is selected by the selector 14. Further, the light amount signal SUM is compared with the reference voltage E indicating a constant level in the comparator 16,
The output of the comparator 16 controls the selector 14. The servo circuit 15 receives the output of the selector 14, displaces the light spot in the radial direction in accordance with the signal, and controls the light spot to follow the spiral line.

FIG. 7 is a timing chart for explaining the relationship between the output of the comparator 16 and the groove G and the land L of the information recording disk 11 in the information recording / reproducing apparatus shown in FIG. The symbols attached to the waveforms in the figure correspond to the symbol positions in FIGS. 4 and 6.

As shown in FIG. 7, the information recording disk 11
On the groove G (n), the light amount signal SUM becomes a low level signal and is inverted at the boundary with the land L (n) to become a high level signal. The same applies to the subsequent groove G
At the boundary with (n + 1), it becomes a low level signal again. Therefore, regarding the relationship between the comparator 16 and the selector 14, when the tracking error signal TE> the light amount signal SUM, the output of the inverting amplifier 13 is selected and the tracking error signal T
When E ≦ light intensity signal SUM, tracking error signal T
Set so that E is selected.

If the selector 14 is controlled by the output of the comparator 16 as described above, it is controlled by the tracking error signal TE which is automatically inverted on the land, and the information is recorded on the information recording disk shown in FIGS. , G (n), L (n), G (n
+1), L (n + 1), ... Can be traced continuously on the spiral line. As described above, the information recording / reproducing apparatus of this embodiment is formed by the information recording disk described in the first embodiment, that is, one spiral.
When a high-density information recording disk with information recorded on both the groove (guide groove) and the land (between the guide grooves) is set, the groove (guide groove) orbit (land between the guide grooves) and the orbit To reverse the polarity of the tracking error signal.

Therefore, one spiral can be continuously traced, and the effect of the information recording disk of the first embodiment is expected, that is, the effect of reducing the crosstalk between the land and the groove, so that the density can be increased. Will be realized.
Further, since there is only one spiral, continuous tracking is possible, there is no break in the recording / reproducing information, the device access time does not become long, and the existing discs that have one spiral are assumed. Since the information allocation architecture can be reused, new technology development and investment can be reduced, and many advantages such as excellent compatibility with existing systems can be obtained.

As described above, the information recording / reproducing apparatus of the first embodiment (the invention of claim 5) has the configuration shown in FIGS. 4 and 5, and collects the light beam on the recording medium. And a tracking error signal generating means (12 in FIG. 4 and 22 in FIG. 5) for generating a tracking error signal by detecting the positional deviation between the light spot and the spiral recording track. 24 to 24), and tracking control means (15 in FIG. 4) for correcting the position of the light spot according to the tracking error signal and controlling the light spot to follow the spiral recording track.
The tracking control means reverses the polarity of the tracking error signal between the spiral winding in which the guide groove is formed and the spiral winding in which the guide groove is not formed so that the light spot continuously tracks the spiral recording track. Control (13 and 14 in FIG. 4). Further, this information recording / reproducing apparatus (the invention of claim 5) is provided with a light amount detecting means (12 in FIG. 4 and 24 in FIG. 5) for detecting the reflected or transmitted light amount of the light spot, and a tracking error signal according to the light amount. The polarity is reversed and the light spot is controlled so as to continuously track the spiral recording track (16, E, 13, 14 in FIG. 4) (information recording / reproducing apparatus of claim 6).

[0048]

[Information Recording Disc of Embodiment 2] Next, a second embodiment of the information recording disc will be described. This embodiment is claimed in claim 2.
The invention corresponds to the invention of claim 3 and the information recording disk described in the first embodiment (the invention of claim 1) or an information recording / reproducing apparatus capable of continuous track tracking (claim). 7 invention). The information recording disk of the second embodiment is characterized in that, in the information recording disk described above in the first embodiment, the polarity reversal timing of the tracking error signal TE can be detected more easily. Have

Therefore, in the vicinity of the boundary from the spiral in which the guide groove (groove) is formed to the spiral in which the guide groove is not formed (land), it can be optically detected at a position different from the line of the spiral. A flag is formed (the invention of claim 2). Further, in this case, the position where the flag is formed is a position separated from the spiral line by approximately ½ of the spiral pitch (claim 3).
Invention).

FIG. 8 is an enlarged view of a part of the area A on the disk-shaped recording medium shown in FIG. 1 in the second embodiment of the information recording disk of the present invention. Reference numerals in the figure are the same as those in FIG. 2, and FA is a flag part, F (n), F (n + 1), F.
(N + 2) indicates a flag, and H indicates a 1/2 spiral pitch.

A part of the area A on the disk-shaped recording medium shown in FIG. 8 corresponds to that in FIG. 2, but the boundary of the spiral circulation, that is, the groove G to the land L or the land L to the groove. The flag portion FA is provided near the boundary of G at a pitch different from the one spiral pitch D. Each flag F (n) to F (n + of this flag part FA
1) may be formed with a groove similar to the groove G, with shorter pits, or intermittently formed.

Further, it may be a thin film having a magneto-optical effect instead of a groove or a pit, or a mark which causes some kind of reflectance change. In short, any method can be used as long as it can be optically detected. In the following description, it is assumed that the groove has the same properties as the groove G. Forming this groove has the advantage that it can be detected by the detection means provided in a normal track tracking device.

It is preferable that the length of the groove is sufficiently longer than the diameter of the light spot formed by the track tracking device or the information recording / reproducing device so that the detection can be performed easily and accurately. The recording capacity of the entire information recording disk is reduced. Therefore, for example, the diameter is set to about 2 to 10 times the diameter of the light spot. By detecting the flag F of the flag unit FA as described above, it becomes easy to invert the polarity of the tracking signal generated for continuous spiral track tracking.

The reason is that it is generally possible to extract the determination timing of the tracking error signal only by the tracking error signal detecting means provided in the track tracking means on the information recording / reproducing apparatus side. The tracking error signal is almost 0 when the light spot is tracking the groove G or the land L, but becomes a value other than 0 when the light spot hits the flag F. Therefore, the flag F is set at a position different from that on the tracking line, that is,
It is provided at a position displaced from the tracking line (the invention of claim 2).

In this case, the position of the flag portion FA, more specifically, the position of the flag F, is preferably formed at a position displaced from the spiral line by 1/2 of the spiral pitch (the invention of claim 3). . In FIG. 8, the groove G (n
+2) and the land L (n + 2) have one spiral pitch D, whereas the flag F (n + 2) and the groove G (n + 2) or the land L (n + 2) are 1/2.
The spiral pitch is H (the invention of claim 3).

As described above, if the flags F are formed at positions separated by about 1/2, the distance between adjacent grooves is 1 /.
It is the position corresponding to 4. The reason for this is that the tracking error signal detecting means included in many track tracking devices is designed so that the tracking error signal becomes maximum at a position of ¼ of the inter-groove distance. Therefore, by arranging the flag at this position, the tracking error signal can be detected more easily.

As described above, in the information recording disk of the second embodiment, in the information recording disk formed by one spiral described in the first embodiment, the guide groove (groove) circumference and the guide groove interval are provided. Since the flag part is provided at a position different from that on the spiral line at the boundary of the (land) orbit, if this information recording disk is used, when the information recording / reproducing device tracks the spiral, the reversal timing of the tracking control polarity can be set. It becomes possible to detect easily and accurately, and the device cost can be reduced (the invention of claim 2).
Further, in the information recording disk provided with such a flag, the flag positions are set at positions separated by approximately 1/2 of the spiral pitch, so that the detection signal of the tracking control signal detection device becomes maximum, and it is even easier. And accurate detection becomes possible (the invention of claim 3).

The above is the configuration of the second embodiment of the information recording disk of the present invention. The information recording / reproducing apparatus suitable for driving the information recording disk described with reference to FIG. 8 will be described in detail below as another embodiment (the information recording / reproducing apparatus of claim 7).

[0059]

[Embodiment 2 of Information Recording / Reproducing Apparatus] This embodiment corresponds to the invention of claim 7, and is an information recording / reproducing apparatus for driving the information recording disk described above as the second embodiment.
This is a second embodiment of the information recording / reproducing apparatus, but as described above, it can also be used as an information recording / reproducing apparatus (invention of claim 6) for driving the information recording disk described in the first embodiment. Is. In the information recording / reproducing apparatus (the invention of claim 7) described in this embodiment, since the polarity of the tracking error signal is inverted by detecting the flag on the information recording disk, the information recording / reproducing described in the first embodiment. As compared with the device, it becomes possible to perform the continuous tracking of the spiral more accurately.

FIG. 9 is a functional block diagram showing the essential structure of the second embodiment of the information recording / reproducing apparatus of the present invention. Reference numerals in the figure are the same as those in FIG. 4, 31 is the information recording disk of the second embodiment, 32 is a positive pulse detection circuit, 33 is a negative pulse detection circuit, and 34 is an SR (set / reset) flip-flop circuit. Show.

The information recording / reproducing apparatus shown in FIG.
As shown in, the information recording disk 31 having a flag has a function of detecting the flag and switching the tracking polarity to continuously track the spiral track. Head 12, inverting amplifier 13, selector 14,
The servo circuit 15 and the like are similar to those in FIG. However, in the information recording / reproducing apparatus of FIG. 9, the sum signal (light quantity signal SU
M) does not need to be detected.

The selection control of the selector 14 is S-
This is performed by the R flip-flop circuit 34. Also,
The tracking error signal TE is used for flag detection,
It is input to the positive pulse detection circuit 32 and the negative pulse detection circuit 33. The positive pulse detection circuit 32 has a function of outputting a pulse, for example, when the tracking error signal TE becomes a positive predetermined value or more.

On the contrary, the negative pulse detection circuit 33 has a function of outputting a pulse, for example, when the tracking error signal TE becomes a negative predetermined value or less. The outputs of the positive and negative pulse detection circuits 32 and 33 are connected to the set (S) terminal and the reset (R) terminal of the SR flip-flop circuit 34, respectively. Therefore, the Q output of the S-R flip-flop circuit 34 becomes "H" level when the tracking error signal TE becomes a positive predetermined value or more,
When it becomes less than a predetermined negative value, it becomes "L" level.

Therefore, regarding the selection control of the selector 14, the Q output of the SR flip-flop circuit 34 is
When it is at "H" level, the output of the inverting amplifier 13 is changed to "L".
When the level is set, the tracking error signal TE itself is set to be selected. If set in this way, the tracking error signal TE is inverted at the flag portion FA at the boundary between the land (L (n) in FIG. 8) and the groove (G (n) in FIG. 8). Tracking can be done. By the above operation, the spiral track is continuously tracked.

FIG. 10 shows the tracking error signal TE and the Q of the SR flip-flop circuit 34 during the continuous tracking of the information recording disk having the flag portion FA shown in FIG.
It is a figure which shows the relationship with an output. Reference numerals in the figure are the same as those in FIG. 6, and cc is a signal detection timing, TEcc.
Indicates a tracking error signal detected at the detection timing c-c.

FIG. 11 is a timing chart for explaining the relationship between the tracking error signal TE and the Q output of the SR flip-flop circuit 34 in the information recording / reproducing apparatus shown in FIG. The symbols attached to the waveforms in the figure correspond to the symbol positions in FIG.

First, it is assumed that the groove G (n) in FIG. 8 is being traced. In FIG. 10, TEaa appears in the tracking error signal TE, but the value is almost 0 because the track is being tracked. After that, when the light spot hits the flag F (n), TEcc appears in the tracking error signal TE.

In this case, on the line (flag F (n)) from the groove G (n) to the land L (n) in FIG. 10,
The tracking error signal TE, that is, the value of TEcc has a positive maximum value. Therefore, the SR shown in FIG.
The flip-flop circuit 34 is set, and its Q output becomes "H" level.

Therefore, the selector 14 outputs the output of the inverting amplifier 13, that is, the tracking error signal TE.
The inverted signal of is selected. When the light spot passes the flag F (n), TEbb appears in the tracking error signal TE.

However, even in this TEbb state, since the output of the inverting amplifier 13 is selected by the selector 14 and the track is traced by the inverted signal, the light spot continues to trace the land L (n) as it is. . Therefore, the value of the tracking error signal TE is almost zero. In this state, the light spot is 1 above the land L (n).
And the next flag F from the end of the land L (n) in FIG.
At (n + 1), the tracking error signal TE,
That is, the value of TEcc has a negative maximum value.

Therefore, a large negative value appears in the tracking error signal TE, the SR flip-flop circuit 34 shown in FIG. 9 is reset, and its Q output becomes "L" level. As a result, the value of the tracking error signal TE itself is selected, and the light spot tracks on the next groove G (n + 1).

As described above, in the information recording / reproducing apparatus (second embodiment) shown in FIG.
(N), L (n), G (n + 1), L (n + 1), ...
And, it can be traced continuously on the spiral line. The information recording / reproducing apparatus (invention of claim 7) of the second embodiment is the same as the information recording / reproducing apparatus (invention of claim 5), in which the information recording disk has a guide groove formed from a spiral in which the guide groove is formed. An optically detectable flag is formed at a position different from the spiral line near the boundary to the unwound spiral (FIG. 8), and the tracking control unit detects the flag and detects the tracking error signal. Reverse the polarity (32 to 34, 13 to 1 in FIG. 9)
4) It is configured as follows.

[0073]

[Third Embodiment Information Recording Disc] This embodiment corresponds to the fourth aspect of the present invention and is an improvement of the information recording disc described in the first and second embodiments. Also in the information recording disk described in the third embodiment, basically, one spiral recording track is formed and the guide groove is formed every other circumference of the spiral, but the groove meanders (wobble).
It is characterized by the fact that

FIG. 12 shows the third information recording disk of the present invention.
2 is an enlarged view of a partial area A on the disc-shaped recording medium shown in FIG. Reference numerals in the figure are the same as those in FIG.

A part of the area A on the disk-shaped recording medium shown in FIG. 12 corresponds to that shown in FIG. 2 except that the groove meanders. The other configuration, that is, one spiral and the land and the groove are alternated for each revolution, is the same as in the information recording disk of FIGS. 1 to 3 and FIG.

The meandering frequency in this case may be constant, or the address information may be frequency-modulated to a constant frequency. When the meandering frequency is constant, the constant meandering frequency can be detected by the information recording / reproducing apparatus and used for rotation control of the rotary motor. It is also possible to demodulate the frequency-modulated address information and use it for the address of recording data or timing management.

The information recording disk itself in which the groove has a meandering shape as shown in FIG. 12 has been conventionally known as described in the prior art (the above-mentioned Japanese Patent Laid-Open No. 7-
14172 publication). However, when an information recording disk (disk) having such a groove meandering is tracked by a normal information recording / reproducing apparatus, that is, an information recording / reproducing apparatus having no sub-beam, etc., the meandering information is permanently from the land. I can't get it. Therefore, rotation control and address management are hindered.

However, in the information recording disk described in the third embodiment, when the land is traced, the groove is traced in the next lap at the latest, so the meandering information can be obtained without fail. Therefore, even in a normal information recording / reproducing apparatus, that is, an information recording / reproducing apparatus that does not have a sub-beam or the like, the meandering information can be surely obtained for one revolution for every two revolutions, so that rotation control, address management, etc. must be performed reliably. You can

For example, the rotation control may be performed only when the meandering information is obtained on the groove and not on the land, but may be controlled by inertia. In this method, since the control is always applied to the next revolution, sufficiently accurate rotation control is realized.

[0080]

[Third embodiment of information recording / reproducing apparatus] This embodiment corresponds to the invention of claim 8 and is the third embodiment of the information recording / reproducing apparatus for driving the information recording disk described in the third embodiment. This is an example. In the information recording disk described in the third embodiment, the groove is meandering, and the meandering information is always obtained every two turns. The information recording / reproducing apparatus of the third embodiment is characterized in that when an information recording disk having such a groove meandering is set, rotation control is performed by the meandering information.

FIG. 13 is a functional block diagram showing the main structure of the third embodiment of the information recording / reproducing apparatus of the present invention. Reference numerals in the figure are the same as those in FIG.
Is an information recording disk of the third embodiment, 42 is a BPF (band pass filter), 43 is an FM demodulation circuit, 44 is an address detection circuit, 45 is an OSC (reference frequency oscillator), 4
6 is a phase / frequency comparison circuit, 47 is a switch circuit, 48
Is a holding circuit (capacitor), 49 is a drive circuit, 50 is a groove / land determination circuit, and 51 is a rotary motor.

The information recording disk 41 shown in FIG.
As shown in FIG. 12 above, it has meandering information. Further, in the information recording / reproducing apparatus of FIG.
Similar to FIG. 9 and FIG. 9, the tracking error signal TE is output. The tracking error signal TE is given to the BPF 42, and the meandering frequency component of the groove is extracted.

The output of the BPF 42 is given to the FM demodulation circuit 43, and the FM demodulation circuit 43 demodulates the frequency modulation component. The demodulated frequency modulation component is sent to a known address detection circuit 44, and the address recorded in the groove as the meandering information is detected. This BPF4
The output of 2 is also supplied to the phase / frequency comparison circuit 46, and the phase and frequency are compared with the reference frequency output from the OSC 45.

The output of the phase / frequency comparison circuit 46 outputs a signal for accelerating the rotation motor 51 when the rotation of the disk is slower than the rotation speed defined by the reference signal and the meandering frequency is low, and the rotation of the disk is changed. When the rotation speed is faster than the reference signal and the meandering frequency is high, a signal for decelerating the rotation motor 51 is output. The output of the phase / frequency comparison circuit 46 is sent to a rotary motor 51 via a switch circuit 47, a holding circuit 48 made of a capacitor, for example, and a drive circuit 49 to control rotation.

When the switch circuit 47 is on, the output of the phase / frequency comparison circuit 46 is sent to the drive circuit 49 as it is. Further, when the switch circuit 47 is off, the holding circuit 48 holds the output of the immediately preceding phase / frequency comparison circuit 46, that is, the immediately previous control state, and gives the output to the drive circuit 49. Here, the "immediately preceding control state" may be a state at the moment when the switch circuit 47 is switched from on to off, or may be an average value of the output of the phase / frequency comparison circuit 46 for a certain fixed period. In short, it suffices to reflect the latest control state before the switch circuit 47 is turned off.

ON / OFF control of the switch circuit 47 is performed by the groove / land determination circuit 50.
As the groove / land determination circuit 50, for example,
It is also possible to use the positive pulse detection circuit 22, the negative pulse detection circuit 23, and the SR flip-flop circuit 24 shown in FIG. In this case, the switch circuit 47 is turned on while the light spot is tracking on the groove, and the light spot is tracking on the land.
The switch circuit 47 is turned off.

By the control operation as described above, the rotation control is applied by the meandering information of the groove during tracking on the groove, and during tracking on the land, the rotation in the control state obtained while tracking the immediately preceding groove is maintained. Control is retained. That is, if the control state immediately before is the state in which the rotary motor 51 is being accelerated, the acceleration is continued as it is, and if the control state immediately before is trying to rotate the rotary motor 51 in a steady state, the steady state is achieved. The rotation is continued.

As described above, by utilizing the fact that the groove orbit for which the meandering information is obtained and the land orbit for which the meandering information is not obtained are alternately obtained while continuously tracing the spiral,
A sufficiently accurate rotation control can be performed. Moreover, since no special detecting means such as a sub-beam is required, an inexpensive information recording / reproducing apparatus can be realized.

In the information recording / reproducing apparatus of the third embodiment (the invention of claim 8), the disk-shaped recording medium is rotated a plurality of times 1
In an information recording / reproducing apparatus for recording / reproducing information on / from a spiral recording track in an information recording disk (FIG. 12) in which a spiral recording track of a book is formed and guide grooves are formed every other circumference of the spiral. The groove has a constant spatial frequency or a spatial frequency that is frequency-modulated with address information, meanders in the radial direction, and has a rotary motor (51 in FIG. 13) for rotating the disk-shaped recording medium.
A meandering detection means (12 and 42 in FIG. 13) that detects a meandering signal of the guide groove according to the rotation of the disk-shaped recording medium, and a rotation control means (FIG. 13) that controls the rotation of the rotary motor based on the frequency of the meandering signal. 45, 46) of the above, and the rotation control means, in the spiral revolution in which the guide groove is not formed,
The control state in the immediately preceding revolution is retained (5 in FIG. 13).
0, 47, 48).

[0090]

According to the information recording disk of the first aspect, information can be recorded both on the guide groove and between the guide grooves, so that the density can be increased by the crosstalk reduction effect of the land and the groove. Also, since there is only one spiral, continuous tracking is possible, and there is no break in the recorded / reproduced information,
The device access time does not increase. Moreover, since it is possible to use the existing information arrangement architecture that is premised on a disk having one spiral, new technology development and investment can be reduced, and compatibility with existing systems is also achieved. Are better.

According to the information recording disk of claim 2, in the information recording disk of claim 1, the flag portion is provided at a position different from the spiral line at the boundary between the guide groove circumference and the guide groove circumference. Therefore, when the information recording / reproducing apparatus in which the information recording disk is set traces the spiral, it is possible to easily and accurately detect the reversal timing of the tracking control polarity, and the apparatus cost can be reduced.

According to the information recording disk of claim 3, in the information recording disk of claim 2, the flag positions are separated by about 1/2 of the spiral pitch. Therefore,
The detection signal of the tracking control signal detection device is maximized, which enables easier and more accurate detection.

According to the information recording disk of claim 4, in the information recording disk of claims 1 to 3, the guide groove is meandered to record the rotation control information and the address information. However, the guide groove will always be tracked on the next lap. Therefore, it becomes possible to detect the rotation control information and the address information, and it is possible to accurately perform the rotation control and the address management without providing a detecting means on the information recording / reproducing apparatus side, and to reduce the cost of the apparatus. Is also achieved.

In the information recording / reproducing apparatus of the fifth aspect, by setting the information recording disk of the first aspect, the polarity of the tracking error signal is reversed between the guide groove orbit and the guide groove orbit, and one spiral is formed. Is tracked continuously. Therefore, it is possible to realize, with a simple configuration, a device that can achieve the effects expected of the information recording disk of claim 1.

According to the sixth aspect of the information recording / reproducing apparatus, in the fifth aspect of the information recording / reproducing apparatus, the polarity of the tracking error signal is inverted according to the amount of light reflected or transmitted by the light spot. Therefore, in addition to the effect of the information recording / reproducing apparatus of the fifth aspect, it is possible to more accurately perform continuous spiral tracking.

In the information recording / reproducing apparatus of the seventh aspect, by setting the information recording disc of the second aspect, the flag on the information recording disc is detected and the polarity of the tracking error signal is inverted. Therefore, in addition to the effect of the information recording / reproducing apparatus of the fifth aspect, it is possible to more accurately perform continuous spiral tracking.

In the information recording / reproducing apparatus of the eighth aspect, by setting the information recording disk of the fourth aspect, the meandering signal of the guide groove is detected to control the rotation, and in the spiral orbit between the grooves, the immediately preceding guide is used. The rotation control state in the groove circulation is maintained. In this way, while continuously tracking the spiral, it corresponds to the alternate appearance of the groove orbit that obtains the meandering signal and the land orbit that does not obtain the meandering signal. It can be carried out. Also, the device can be realized at low cost.

[Brief description of drawings]

FIG. 1 is a diagram conceptually showing an embodiment of a spiral structure of a recording track of an information recording disc of the present invention.

FIG. 2 is a partial area A on the disk-shaped recording medium shown in FIG.
FIG.

FIG. 3 is an enlarged cross-sectional view of a part of the area A on the disk-shaped recording medium shown in FIG.

FIG. 4 is a functional block diagram showing an embodiment of the main configuration of the information recording / reproducing apparatus of the present invention.

FIG. 5 is a functional block diagram showing a main configuration of a signal detection unit that generates a tracking error signal TE and a light amount signal SUM in the information recording / reproducing apparatus.

FIG. 6 is a diagram showing a relationship between a groove G and a land L, and a tracking error signal TE and a light amount signal SUM.

7 is a timing chart for explaining the relationship between the output of the comparator 16 and the groove G and the land L of the information recording disk 11 in the information recording / reproducing apparatus shown in FIG.

FIG. 8 is an enlarged view of a partial area A on the disk-shaped recording medium shown in FIG. 1 in the second embodiment of the information recording disk of the present invention.

FIG. 9 is a functional block diagram showing a main configuration of a second embodiment of the information recording / reproducing apparatus of the present invention.

10 is a tracking error signal T during continuous tracking of the information recording disk having the flag portion FA shown in FIG.
It is a figure which shows the relationship between E and the Q output of the SR flip-flop circuit 34.

11 is a timing chart for explaining the relationship between the tracking error signal TE and the Q output of the SR flip-flop circuit 34 in the information recording / reproducing apparatus shown in FIG.

FIG. 12 is an enlarged view of a partial area A on the disk-shaped recording medium shown in FIG. 1 in the third embodiment of the information recording disk of the invention of FIG.

FIG. 13 is a functional block diagram showing the main configuration of the third embodiment of the information recording / reproducing apparatus of the present invention.

[Explanation of symbols]

 11 Information Recording Disc 12 Head 13 Inversion Amplifier 14 Selector 15 Servo Circuit 16 Comparator 21 Objective Lens 22 Two-Division Optical Sensor 23 Subtractor 24 Adder 31 Information Recording Disc of Second Embodiment 32 Positive Pulse Detection Circuit 33 Negative Pulse Detection Circuit 34 SR flip-flop circuit 41 Information recording disk of the third embodiment 42 BPF (band pass filter) 43 FM demodulation circuit 44 Address detection circuit 45 OSC (reference frequency oscillator) 46 Phase / frequency comparison circuit 47 Switch Circuit 48 Holding circuit (capacitor) 49 Drive circuit 50 Groove / land determination circuit 51 Rotation motor

Claims (8)

[Claims] 1. An information recording disk, wherein one spiral recording track is formed on a disk-shaped recording medium so as to rotate a plurality of times, and guide grooves are formed every other circumference of the spiral. 2. The information recording disc according to claim 1, wherein the spiral is optically formed at a position different from a line on the spiral near a boundary from the spiral having the guide groove to the spiral having no guide groove. An information recording disk characterized in that a detectable flag is formed. 3. The information recording disk according to claim 2, wherein the position where the flag is formed is a position separated from the line of the spiral by about 1/2 of the pitch of the spiral. Recording disk. 4. The information recording disk according to any one of claims 1 to 3, wherein the guide groove is meandering in a radial direction at a constant spatial frequency or a spatial frequency frequency-modulated with address information. An information recording disk to be used. 5. An information recording disc in which information is recorded on the spiral recording track in which one spiral recording track that makes a plurality of revolutions is formed on a disc-shaped recording medium, and guide grooves are formed every other revolution of the spiral. Record of /
In an information recording / reproducing apparatus for reproducing, a head for condensing a light beam on the recording medium to form a light spot, and a positional error between the light spot and the spiral recording track are detected to generate a tracking error signal. Tracking error signal generating means, and tracking control means for correcting the position of the light spot according to the tracking error signal and controlling the light spot to track the spiral recording track. The means reverses the polarity of the tracking error signal between the spiral winding in which the guide groove is formed and the spiral winding in which the guide groove is not formed, and the light spot continuously tracks the spiral recording track. An information recording / reproducing apparatus characterized by being controlled to 6. The information recording / reproducing apparatus according to claim 5, further comprising a light amount detecting means for detecting a reflected or transmitted light amount of the light spot, wherein the polarity of the tracking error signal is inverted according to the light amount, An information recording / reproducing apparatus, wherein a spot is controlled so as to continuously track the spiral recording track. 7. The information recording / reproducing apparatus according to claim 5, wherein the information recording disc is near a boundary from a spiral having the guide groove to a spiral not having the guide groove, and is on a line of the spiral. An information recording / reproducing apparatus, wherein optically detectable flags are formed at different positions, and the tracking control means detects the flag and inverts the polarity of the tracking error signal. 8. An information recording disc on an information recording disc in which one spiral recording track is formed on a disc-shaped recording medium so as to rotate a plurality of times, and guide grooves are formed every other turn of the spiral. Record of /
In the information recording / reproducing apparatus for reproducing, the guide groove is a constant spatial frequency or a spatial frequency frequency-modulated with address information, meanders in the radial direction, and a rotation motor for rotating the disk-shaped recording medium, The rotation control is provided with a meandering detection means for detecting a meandering signal of the guide groove according to the rotation of the disk-shaped recording medium, and a rotation control means for controlling the rotation of the rotary motor based on the frequency of the meandering signal. The information recording / reproducing apparatus is characterized in that the means holds the control state in the immediately preceding revolution in the spiral revolution in which the guide groove is not formed.