JPH08203083A - Optical information storage medium - Google Patents

Abstract

PURPOSE: To prevent the occurrence of timing and tracking errors by providing an array having uniform distribution of indexes which can be optically sensed by incorporating timing, tracking and address information therein. CONSTITUTION: The optical information storage medium of an optical disk 10 shape comprises a central opening 12, a central label area 14, an outer edge 16 and an information holder 18 between the label 14 and the edge 16. The area 18 is systematically divided in angular and radial directions. Indexes, i.e., bits 32 which can be optically sensed are aligned at the selected position on the disk 10. The array of the uniform distribution of the indexes surrounds the constitution in which one or more indexes can be omitted from the sector or channel. With such a constitution is useful for simplifying the synchronization.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to optical media, and more particularly for data or information storage having an evenly distributed array of indexes, such as pits, which can be used to provide timing, precision tracking and address information. Optical media.

[0002]

Optical media such as optical disks, compact disks and data disks are manufactured to close tolerances. For example, a disk with a precisely positioned central hole will reduce radial runout and concentric deviations. The disk is also manufactured with little or no radial distortion or elliptical extension. As tolerances have improved, the storage capacity of such devices has increased.

Eccentricity and elliptical distortion cause timing and tracking errors. Residual defect compensation is usually accomplished by a precise servo control scheme that utilizes feedback from an optically sensitive index on the disc. The index read by the laser stylus usually includes timing marks or pits for generating a clock signal, so-called wobble pits for tracking control, and address pits for accessing information in the track. Typically, the pits are arranged in various formats so that the position of any particular pit has a specialized and distinct meaning. These formats will vary according to the control scheme utilized, data rate, laser spot size, servo feedback loop configuration, data density and various other constraining factors. Unfortunately, the various formats are usually not compatible. Also, trying to gain performance benefits in one format requires trade-offs in another area. For example, a particular pit array can be used to accurately spot or address disk locations by tracks and sectors. However, such arrays require tremendous disk space and can be accurate but slow to access.

Compensation for angular and radial runout is conventionally provided by feedback control based on a media format designed for feedback control. There is a limit to the feedback alone and a strict medium tolerance is required, so that the cost of the medium is added. Feedforward, or predictor, schemes can relax the media tolerance requirements. Therefore, there is a need for media formats designed for both feedback and feedforward control. Hardware systems for performing feedforward and feedback control may be more complex than those performing feedback only, but such systems are more flexible and more powerful. Current technology allows cost-effective implementation of such complex servo designs.

[0005]

In summary, there is a need for a simplified pit format that mitigates the tight physical tolerances required by currently available optical media without increasing access time. There is also a need for a pit format that has the ability to improve resolution as technology improves.

[0006]

SUMMARY OF THE INVENTION The present invention is capable of providing interchangeable utilization of evenly distributed arrays of indexes, such as pits, to provide timing, precision tracking and address information to an optical information storage medium. It is based on the finding that it can.

The medium is divided into evenly distributed servo areas separated by data areas, each band in the servo area being assigned only one index or pit, each pit containing timing, addressing and tracking information. That is one of the features of the present invention. The pit pattern can be regular series, double or overlapping series or random arrangement.

In one embodiment, the present invention is directed to a universal pattern or format of pits that is relatively insensitive to pit size and disc manufacturing tolerances.
In this embodiment, the present invention is directed to optical media, such as optical discs, each formatted with a uniformly distributed array of time-synchronized indexes that can be used to provide timing, tracking and address information.

In a preferred form, the optical medium is a concentric circle divided circumferentially into sectors having servo areas containing time-synchronized and radially offset pits that interchangeably establish timing, address and tracking functions. It comprises an optical disc having track bands arranged at spiral intervals.

In particular, the disc is circumferentially divided into a plurality of conformal portions. Each disk has S sectors per 360 °. Each sector has F fields and each field has C channels. At least one channel per field is assigned to the servo function and the remaining channels are assigned to data storage.

The disc is radially divided into B concentric bands. Each band is further subdivided into T tracks. Each servo channel has one pit in each band. The pits are arranged in a known radial relationship with each other so that precise tracking can be established. Each pit has an angular position within the corresponding servo channel that establishes its value v. That is, each servo channel has V time synchronization positions therein and defines v values from (0) to V-1 for the pits assigned to each such position in a particular channel. Then, an address for each band can be established. In the band,
The band numbers are evenly distributed several times over the servo channel pit values. The same digit of the band number of all bands is associated with the pit value of the same servo channel.
The servo channels resemble the relatively narrow spokes of the wheels and the data channels represent the relatively large spaces between them.
In a simple embodiment, a pit contains timing information caused by corner separation, also contains address information caused by the time-synchronized angular position of each pit in the servo channel, and the radius of each pit with respect to other pits. It contains precise tracking information generated by directional position.

[0012]

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an optically sensitive index or pit that can be selectively used to implement timing, addressing and precise tracking using the same index, eg, pit, interchangeably. It is directed to a method of universally formatting various optical media. As noted above, conventional methods of formatting optical media utilize optical mark or pit selection patterns to separately determine timing, addressing and radial shake compensation functions. Further, in prior art arrangements, pits are typically functionally spatially separated within a given sector or band on the disc. Normally, the address is encoded with the same recording code and density as the user data. Therefore, prior art systems have limited versatility. While these systems are effective in providing timing, addressing and precise tracking, these configurations are not designed for significant improvement in disk manufacturing methods. Also, conventional formatting techniques do not take into account the increase in data recording density made possible by the continuous improvement in accuracy of laser scanning and servo techniques.

The present invention provides a formatting scheme that is versatile in pit functionality, insensitive to disk manufacturing tolerances, and operates over a wide range of track sizes and linear data densities regardless of pit size formatting.

In the present invention generally shown in FIG. 1, an optical information storage medium in the form of an optical disk 10 has a central opening 12, a central label area 14, an outer edge 16 and a label 14 and an outer edge 16.
It has an information holding unit 18 between them. The information area 18 is systematically divided into angular and radial parts as follows.

FIG. 2 shows the angular section. The main angular compartment is sector 20. In the present invention, there are an integer S equal sectors 20 per 360 ° (s = 0, 1,
2 ,. ． ． Numbered S-1). Each sector 20 is subdivided into F equal fields 24 (f =
0, 1, 2 ,. ． ． Each field (numbered F-1) is further subdivided into C equal channels 26 (numbered c = 0, 1, 2, ... C-1). The channels 26 are classified into servo channels 28 and user data channels 30. At least one channel in each field is a servo channel. Without loss of generality, the first channel of each field will be referred to as channel 0 in the following description. The index 32, which is, for example, a pit, establishes individual servo data stored on the disk 10 in each servo channel. Each servo channel has a unique address including a sector number, a field number and a channel number. In the illustrated embodiment, a sector can be defined as containing more than one servo channel.

The disk 10 is radially divided into B equal concentric bands 34 (b = 0, 1,
2. ． ． B-1 numbered, Figure 3). In the exemplary embodiment, the band number increases toward the outer edge 16 of the disk 10. Each band 34 also includes T equal-spaced tracks 36.
Subdivided into (numbered t = 0,1,2 ... T-1). The track number also increases towards the outer edge 16 of the disc 10. Each track has a unique address including a band number and a track number.

Optically sensitive indexes or pits 32 are arranged at selected locations on the disk 10. The pits 32 are evenly distributed and arranged in a pattern which is time-synchronized and offset in the radial direction. The pits 32 are simply arranged on the polar coordinate grid. In the prior art formatting arrangement, the pits are angularly clustered as "header sectors" and "servo bytes" and radially clustered at or adjacent to the user data track. In the present invention, the pits are typically arranged at equal intervals in the angular direction for every C channels. Within the servo channel, the pits are radially separated by exactly one band width and are therefore evenly distributed on this axis. The distribution is digital in that there are some discrete locations that can contain pits. Whether a particular position is occupied is determined by a series of equations or solutions. One solution is servo channel 28
The band number at the time-synchronized position of the pits in is encoded. Other solutions determine the radial offset track position of any one pit with respect to its neighboring pits.

The evenly distributed array of indexes surrounds the arrangement where one or more indexes can be omitted from a sector or channel. Such a configuration is useful for simplifying synchronization. For example, in the embodiment detailed here, the last pit in sector S-1 can be deleted.

Further, although the indexes are described as pits, various shapes of sensible indexes can be used in the embodiments. For example, the index can be represented as a phase change, polarization or magnetic effect, transmission change or reflectance change of the medium. The sensible index may be a variety of methods including, but not limited to, physically dislocating the surface of the medium to form pits, or printing, etching or molding as well as other techniques known to those skilled in the art. Can be made by

Each pit has a digital value determined by the position of the pit 32 within the servo channel 28.
In particular, referring to FIG. 4, servo channel 28 has pits 32A and 32B in separate bands 34A and 34B. When each servo channel 28 has a finite arc length L, it can be arbitrarily called 0 if the pit is located at the position displaced toward the start point of the servo channel 28, and at the position displaced toward the end point of the servo channel 28. It can optionally be called 1, and vice versa. In the example of FIG. 4, pit 32A is located at L / 3 as measured from the beginning of the channel and is therefore a "0" pit. Pit 32B is located at 2L / 3 as measured from the same position and is therefore a "1" pit. According to the present invention, V values v can be assigned to pits by dividing the arc of the servo channel into V + 1 equal parts (where v = 0, 1,
2. ． ． V-1). The value of the pit is related to the division boundary centered on the pit. Therefore, a digital value can be assigned to each pit to establish an address.

A general control method is shown in FIG. A scanning beam 40 from a scanning laser 42 mounted on a radially displaceable laser drive 43 is adapted to detect each pit 32 of the disk 10. A servo motor or disk drive 46 rotates the disk at a controlled speed. The control system 48 manages the operations of the laser drive 43 and the disc drive 46. Laser drive 43 by sensing the position of pit 32
And an input signal to the control system 48 of the disc drive 46, which responds to the sensed pits by positioning the laser 42 and rotating the disc at a precise speed.

The offset layout of the pit 32 according to the present invention is shown in FIG. (The number chosen for this example does not occur in the actual disc, but helps to explain the present invention in a simple and understandable way. Some examples are given below.) The layout is based on the base pattern 35 (clearly. It is shaped with a thick line in order to do). The base pattern 35 is an area consisting of 1 band 34 × 1 sector 20, which is repeated B * S times, where B is equal to the number of bands on the disc and S is equal to the number of sectors. The number of pits 32 in the base pattern 35 is equal to the number of tracks 36 into which the band is divided and equal to the total number of servo channels 28 per sector 20. Each pit 32, shown as a circle enclosing a number, is centered on a corresponding track 36 in the radial direction and has only one pit in the base pattern. Each pit is arranged in the servo channel 28. There is only one pit per servo channel in the base pattern. For simplicity,
The base pattern 35 shown in the embodiment of FIG.
6 (0, 1, 2, 3) x 4 field 24 (0, 1,
2, 3) and each field has one servo channel 28 and one user data channel 30. You can see that the pits in the same servo channel are centered on the same track in the corresponding band. Radial pit offsets are useful for precision tracking. As will be described later, band addresses are encoded by their angular positions within the servo channels.

FIG. 7 is a detailed view of the base pattern 35 of FIG. 6 with a signal diagram attached. In the base pattern 35,
The first pit 32 of field 0 is centered on track 0 in the radial direction. The servo pit next to field 1 is centered on track 1. The remaining pits are centered on the track with the same number as the field. Therefore, the pit layout shown in FIG. 7 is arranged as a series of pits arranged in the servo channel 28 followed by one data channel 30. Each servo pit is offset by one track from the next pit in the series.

A closer inspection of FIG. 6 reveals that the base pattern is repeated in each band and sector, but there are subtle differences between repeated copies. In FIG. 6, each pit 32 is “1” as indicated by a circled number.
Alternatively, it has a value of “0” and is arranged after or at the beginning of the servo channel according to the value. This sequence of "1" s and "0" s changes with each copy of the base pattern. Actually, the sequence of "1" and "0" encodes the number of the specific band in which the copy of the base pattern is arranged. The angular position of a pit within servo channel 28 is determined by the value of the band number digit associated with that pit. The pit of channel 0 of sector 0 in FIG. 6 corresponds to the most significant digit (MSD) of the band number, and the following digits appear in descending order to the least significant digit (LSD). (Any other fixed digit order, such as ascending order or random order, is within the scope of the invention.) The band number digits are then repeated in the same sequence. In the example of FIG. 6, the band number is mapped to three pits and the address of band 1 is 0,0,1. Because the number of digits in the band number is not equal to the number of servo channels in the sector, the fine structure of the base pattern copy changes, causing the band number digit to perturb through the sectors of the band. In the specific copy of the base pattern 35 shown in FIG. 7 (band 1, sector 1 in FIG. 6), the first pit 32 of field 0 is centered at L / 3 in the angular direction (that is, the pit is 0). Due to the perturbation of the band address digit through the sector, this pit represents the second digit of the band address.

In particular, the base pattern 35 selected from the band 1 sector 1 of FIG. 6 has four tracks 0, 1, 2, 3
And 4 fields 0, 1, 2, and 3. Each field has a servo channel 0 and a data channel 1. Servo channel 0 is divided by a centerline 60. Reading spot 5 by scanning beam 40 (FIG. 5)
A zero occurs which can be moved with respect to the base pattern 35 along various paths depending on the output signal from the laser driver 43. For example, when the reading spot 50 is following a particular track, the spot 50 is controlled to move more or less midway along the particular track. For example, in FIG. 7, spot 50 can follow path 52 along track 1 of the band. If the spot 50 is guided around the disc, it can, for example, follow a path 54 that intersects several tracks.

The read spot 50 produces the on-track signal 1 as it moves along the dotted line 52. A pit crossing signal is generated when the spot 50 crosses the disc along the path shown by the dotted line 54. For convenience, the dotted line 54 passes near the center of each of the four pits in the base pattern and the generated signals appear equal. The derivative signal is a periodic signal with a zero crossing for each pit near the centerline 60 of each servo channel. In FIG. 7, the differentiated signal is derived to correspond to the pit crossing signal and thus the amplitude of each cycle is the same. However, it will be appreciated that a series of unequal pulses will result in the same zero crossing 58. As shown, a series of 4 pulses and 4 of the base pattern 35 can be generated by any path through the base pattern.
Four zero crossings occur, one for each pit in the field. These four pulses and four zero crossings can be used to determine timing, addressing, and fine tracking, as described below.

The timing can be easily established by counting down from the high frequency system clock signal and providing the two window signals shown in FIG.
The "0" window is 1/3 channel long and ends at midpoint 60 of servo channel 28. "1" window is 1 /
It is three channels long and begins at midpoint 60 of servo channel 28. In the present invention, the zero crossing 58 must occur in the middle of each window signal. The control system 48 of FIG.
And any difference can be compensated by applying a feedforward or feedback correction to the frequency of the servo drive 46 or system clock. Since the servo channel is adjusted band by band, these operations can proceed even if tracking is not established.

It should be appreciated that the circumferential or angular spacing of any two pits can be used as timing information. It is not necessary to provide a special timing, that is, a clock pit as in the prior art. There is a well known relationship between the midpoint 60 of the servo channel and the zero crossing 58. Therefore, the timing can be accurately established simply by observing the time between the occurrence of any two zero crossings 58. The present invention allows any and all pits to function as clock pits.

The "0" and "1" window clock signals also provide address decoding means for the current band. 0
If the zero tolerance 58 occurs in the middle of the window signal, this pit is 0 pit, and the zero tolerance 58 is 1 as well.
When it occurs in the middle of the window signal, it is a pit. Since the coordinate band address digits are radially aligned band by band, at least the coarse address can be read even if tracking is not established. Moving from band to band changes the lower digit but not the upper digit. A coarse indication of radial position is obtained by reading the upper digit from which a radial runout feedforward or feedback correction can be derived and applied to the control system 48 and the laser drive 43. When this correction is applied, radial runout is reduced, more address digits can be read, and fine corrections can be made.

The same format features described above are also useful for performing random access. When the reading spot 50 moves at a high speed with respect to the track, the highest part of the band number can be searched with high reliability. If the speed of the spot 50 is significantly reduced, all band numbers can be searched with high reliability.
When the spot 50 moves slowly with respect to the track, the track tolerance can be counted based on the track-to-track offset of the pit.

When the radial runout is reduced to one band,
The amplitude of the peak is replaced with the derivative signal as the source of deflection data. The relative amplitude of the servo pit signal from each field can be used to determine the track position within the band. The largest of the four peaks represents the local track in the meandering of the read spot 50, and is given a radial runout signal, similar to the band address described above. More precise tracking can be performed by comparing the amplitudes of multiple peaks. In the digital method, whether the track 1 signal is larger than the track 0 signal,
The actual radial position is determined by checking whether the track 2 signal is larger than the track 1 signal, and so on. In the analog scheme, the on-track signal 1 can be used to determine radial runout in a manner similar to conventional "wobble pit" based systems. In particular, the pits in fields 0 and 2 on either side of line 52 produce equal output when spot 50 follows line 52 in the center of track 1. On-track signal for fields 0 and 2
Any difference between 1 results in an error signal that can be used to correct the runout. Therefore, the pit pattern has a radial shake compensation capability.

Once a precise track is established, clocking can be fine. In the on-track signal 1, the pits in the field 1 generate a relatively large output. This large amplitude gives a more reliable zero tolerance than, for example, a pit in field 3,
It can be used as a clocking signal, much like a conventional "clock pit" based system.

As long as the data stored in the user data channel does not interfere with the information from the servo channel, the servo format can take into account various recording codes, radial recording density and linear recording density. Whether interference occurs depends on the characteristics of both the device and the medium. A recording code and linear density synchronized with the servo channel clock are preferred. The radial recording density is preferably an integral multiple of the track width. The example given below is a tubular (Table II) and graphic (Fig.
-10) shows another embodiment of a suitable format layout of the type. Table I defines the terms used. For example, the total number of bands is identified by the letter B and the band number is identified by b, 0, 1, 2. ． ． The numbers such as B-1 are attached.

[0034]

[Table 1] Format Description Parameter Symbol Value Band per disc B Band number b 0. . (B-1) Track per band T Track number t 0. . (T-1) Sector per rotation S Sector number s 0. . (S-1) Field per sector F Field number f 0. . (F-1) Channel per field C Channel number c 0. . (C-1) Servo channel SC Servo channel number sc 0. . (SC-1) Servo value V Servo position value v 0. . (V-1) Digit per band number (V base) D digit number d 0. . (D-1) Digit value of band number b [d] 0. . (V-1) Channel identification (s, f, c) Position identification (b, t, s, f, c) Servo position (b, t, s, f, sc) Pit center radial coordinate r Pit center Angular coordinate a Channel arc length L Track width W Innermost track radius R Integer multiplication * Integer division div modulo mod Inequality <>

From the above, it can be seen that the base pattern is repeated in each sector and band throughout the entire disc. Therefore, only the base pattern is shown in the following examples. Further, in the figure, only black thick rectangles appear at each servo position (tracks, fields and channels including servo pits) because these positions are clearly occupied by the notes below and the description in Table 2. .

Each track of the base pattern has one diagonal line 70 of each field and the same channel (channel 0).
An example of the first format with one offset servo position in is shown in FIG. Each track number t has a servo position within the corresponding field number f. As described above, the servo position winds at the end of each sector and repeats the base pattern.

In FIG. 9, the servo position is equally divided between the two offset lines 72a and 72b. Each track of the base pattern has one servo position. Positions in one line, eg 72a, are radially offset by one track for each field but remain in the same channel. Each position on the other line 72b is also radially offset by one track for each field and occupies a different channel within the field.
This configuration is particularly suitable for conventional "wobble pit" services. The radial spacing between adjacent pits is optimized to be half the band width. The close spacing of these pits in the angular direction minimizes the effect of local variations on the disc on the amplitude mismatch of the signals from these "wobble pits".

The uniform or graded pit configuration shown in FIGS. 6-9 is a simple embodiment, but any configuration including random distribution of pits is useful. Whatever array is used, only the correlation between the track position of each pit and its angular position needs to be stored in the control system. A random configuration of one servo position for each track in the same channel of each field is shown in FIG.

Table 2 shows a description of each typical format. The notes following the table establish the definition based on each description.

[0040]

[Table 2] Parameter format Format Format Example 1 (Fig. 8) Example 2 (Fig. 9) Example 3 (Fig. 10) B 11,000 30,000 4,000 D 15 17 7 T 8 10 15 S S 90 408 504 F 8 5 15 C 20 15 5 V 2 2 4 SC 1 2 1 Format 1: ((t = f) and (s <> 89) and (f <> 7) and (c = 0)) The (b, t, s, f, c) position includes the pit center. The coordinates of the pit center are r = R + W * (b * 8 + t) and a =
(S * 160 + f * 20) * L + (b [s * 8 + f) m
od15] +1) * L / 3. Format 2: ((tmod5 = f) and (s << 4)
07) and (f << 4) and (c = tdiv5)), the position (b, t, s, f, c) includes the pit center only then. The coordinates of the pit center are r = R + W * (b * 1
0 + t) and a = (s * 75 + f * 15 + tdiv5)
* L + (b [s * 10 + f * 2 + tdiv5) mod1
7] +1) * L / 3. Format 3: ((t, f) is an element of set A)
And (s << 503) and (f << 14) and (c =
0)), the (b, t, s, f, c) position includes the pit center only then. The coordinates of the pit center are r = R + W
* (B * 15 + t) and a = (s * 75 + f * 5) * L
+ (B [s * 15 + f) mod7] +1) * L / 5. The elements of set A are: (0,5), (1,9),
(2,8), (3,11), (4,10), (5
6), (6, 1), (7, 14), (8, 4), (9,
12), (10,3), (11,2), (12,0),
(13,13), (14,7)

In the example, there are no pits in the final servo channel. Therefore, the pits that the device of FIG. 5 detects after the maximum time interval between pits (whether or not the device clock is phase synchronized with the pits) are from the servo channel (0,0,0). Yes, it is due to the fact that there are no pits in the servo channels (S-1, F-1, SC-1). This feature facilitates obtaining servo channel synchronization and coarse timing.

In the embodiment, the most significant digit of the band address is zero, and the servo channel (0,0,0) is used.
Is mapped to. Therefore, the value V of the first pit in the first servo channel becomes zero, which enables more precise synchronization.

Furthermore, if the band number is repeated an integer number of times (excluding the missing digits in the last servo channel), all pits of the servo channel to which the highest digit of the band number is mapped correspond to the zero value of the servo position. The pits of these servo channels are equidistant because they are centered on the circular arc position, which facilitates phase synchronization and clock acquisition between the servo channel pits of the device of FIG.

As described above, the band numbers are continuously recorded around the disc in a repeating sequence of digits in a prescribed order. The band number is recorded (S * F * SC) div (D) times in the servo channel of the band, which is 48 times for format 1 and format 2
240 times for, and 108 for format 3
0 times. The complete band number is recorded for each successive D servo channel in the band.

In order to always retrieve the band number with high reliability by synchronizing the tracking servo, each track has each digit of the band number having a pit centered on the track (S * F * SC) div (D ) Div (T)
Including 6 times for Format 1,
Format 2 is 24 times and format 3 is 72 times. Therefore, it is not necessary to use a complicated complementary addressing method in which a redundant configuration is incorporated. This feature of the format is D and F * S
True unless C has a common prime factor.

Tables 3-1, 3-2 and 3-3 below show the fifth selected band number (eg band 2814) on the servo pit for each format example 1, 2 and 3.
Indicates copy mapping.

[0047]

[Table 3] Table 3-1 Format 1 Band Digit Position Position Copy Number Rank Value Track Channel Position 2814 5 Highest 14 0 4 (7,4,0) L / 3. 13 0 5 (7, 5, 0) L / 3. 12 0 6 (7, 6, 0) L / 3. 11 17 (7,7,0) 2L / 3. 10 0 (8,0,0) L / 3. 9 1 1 (8,1,0) 2L / 3. 80 2 (8,2,0) L / 3. 7 1 3 (8,3,0) 2L / 3. 6 1 4 (8, 4, 0) 2L / 3. 5 15 (8, 5, 0) 2L / 3. 4 16 (8, 6, 0) 2L / 3. 3 1 7 (8,7,0) 2L / 3. 2 1 0 (9,0,0) 2L / 3. 1 1 1 (9,1,0) 2L / 3 Lowest 0 2 (9,2,0) L / 3

[0048]

[Table 4] Table 3-2 Format 2 Band Digit Bit Position Position Number Copy Rank Value Track Channel Position 28145 5 Highest 16 08 (6,3,1) L / 3. 15 0 4 (6,4,0) L / 3. 14 09 (6, 4, 1) L / 3. 13 0 (7,0,0) L / 3. 120 5 (7,0,1) L / 3. 11 1 1 (7,1,0) 2L / 3. 10 0 6 (7,1,1) L / 3. 9 12 (7,2,0) 2L / 3. 8 0 7 (7,2,1) L / 3. 7 1 3 (7,3,0) 2L / 3. 6 18 (7,3,1) 2L / 3. 5 1 4 (7,4,0) 2L / 3. 4 19 (7,4,1) 2L / 3. 3 1 0 (8,0,0) 2L / 3. 2 1 5 (8,0,1) 2L / 3 1 1 1 (8,1,0) 2L / 3 Bottom 0 0 6 (8,1,1) L / 3

[0049]

[Table 5] Table 3-3 Format 2 Band Digit Position Position Copy Number Rank Value Track Channel Position 2814 5 Highest 6 08 (2,4,0) L / 5. 5 2 0 (2,5,0) 3L / 5. 4 2 5 (2,6,0) 3L / 5. 3 3 14 (2,7,0) 4L / 5. 2 3 2 (2,8,0) 4L / 5. 1 3 1 (2,9,0) 4L / 5 Lowest 0 2 4 (2,10,0) 3L / 5

The following examples illustrate useful numerical relationships of servo controller characteristics and features with respect to pit format, disk size and related aspects of the invention.

The description of the format is the same as the description of the format 1. In addition, the statements in the table below also apply.

[0052]

[Table 6] Parameter Symbol Value Unit Innermost track radius R 5.50 mm Disk outer diameter OR 25.00 mm Pit size (FWHM) SP 0.8 μm Track width W 0.2 μm Channel arc length L 436 urad R Channel length at LR 2.4 μm Channel spot size (FWHM) SS 0.8 μm (FWHM) -full width at half maximum

For optimum servo performance, the pit size is preferably the same as the scanning spot size. For the same reason, the band width B is preferably twice the pit size.

The channel length at the radius R of the innermost track is three times the pit size (regardless of whether the value of the servo position is "0" or "1"), the interference from the servo channel to the data channel is Guarantee that it will not happen.

Servo format overhead is 5
%, Ie 19 channels are used for data,
One channel is used for servo.

The present invention is more versatile than prior art methods because it develops a unique and simple pit pattern to guide it to any position on the disc. The pattern is even and versatile. This is accomplished because each pit provides unique information about the timing of the speed control, the radial position of the disc runout, and tracking and navigation addressing. Timing is achieved by circumferentially positioning each pit within a known servo channel. Precise radial positioning is achieved by radially offsetting the pits. Addressing is accomplished by angularly positioning each pit within the servo channel.

An important feature to understand is that the formatting scheme of the present invention includes timing, tracking and addressing using the same pits for different purposes. The format is simple and the servo control can be further improved later without major changes to existing control scheme hardware or software or the need for new disk formats.

Having described the embodiments of the present invention,
It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the invention, and it is intended that such changes and modifications be within the spirit and scope of the present invention in the claims.

[Brief description of drawings]

FIG. 1 is a plan view of an optical disc generally illustrating a layout of angular sectors and radial bands formatted according to the present invention.

2 is an exploded view of the basic angular section of the optical disc shown in FIG. 1 having sectors, fields and channels.

3 is a diagram showing basic radial divisions of the optical disc shown in FIG. 1. FIG.

FIG. 4 is an enlarged view showing a basic pattern for distinguishing pit values.

FIG. 5 is a schematic diagram of a servo control method.

FIG. 6 is a schematic diagram showing a basic layout and its information content.

FIG. 7 is a diagram showing pits and corresponding signals used for supporting a basic servo function.

FIG. 8 is a diagram showing another pit pattern according to the present invention.

FIG. 9 is a diagram showing another pit pattern according to the present invention.

FIG. 10 is a diagram showing another pit pattern according to the present invention.

[Explanation of symbols]

 10 Optical Information Storage Medium 12 Central Aperture 14 Central Label Area 16 Outer Edge 18 Information Area 20 Sector 24 Field 26 Channel 28 Servo Channel 30 Data Channel 32 Index 34 Band 35 Basic Pattern 36 Track 40 Scanning Beam 42 Laser 43 Laser Drive 46 Disk Drive 48 Control method 50 reading spots

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[Procedure amendment]

[Submission date] May 18, 1995

[Procedure Amendment 1]

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[Figure 10]

Claims (19)

[Claims] 1. An optical information storage medium comprising an evenly distributed, time-synchronized and radially offset array of optically sensitive indexes each containing timing, tracking and address information. 2. An optical information storage medium comprising a disc with sensible marks, said marks being symmetrically arranged within a defined area containing peripheral servo channels and radial annular bands on a polar coordinate grid. And located in each band for each servo channel that establishes timing and is time-synchronized in the corresponding channel to selectively display individual values for establishing band address digits, and each mark An optical information storage medium arranged radially in a selected pattern for a mark to provide logical information regarding subdivision within each corresponding band. 3. An optical medium according to claim 2, wherein one such mark is provided for each servo channel in each band. 4. An optical medium according to claim 2, wherein the servo channel has a defined angular length L and the mark has a defined value with respect to its corresponding position relative to a reference along said length L. Optical media, time synchronized. 5. The optical medium according to claim 4, wherein the length L is equally divided into V + 1 parts, and the mark has L / (V +
1), 2L / (V + 1) ,. ． ． , And VL / (V +
1) An optical medium having a position-defined value. 6. An optical medium according to claim 4, wherein the length L is divided into three and the mark has a value defined by its L / 3 and 2L / 3 positions. 7. The optical medium according to claim 6, wherein 0 is arranged in L / 3 and 1 is arranged in 2L / 3. 8. The optical medium according to claim 2, wherein a mark is selectively arranged as a digital 1 or a digital 0 in each servo channel, and a band address is defined by a plurality of such 1s and 0s. , Optical media. 9. The optical medium according to claim 8, wherein the band address is defined by 1 mark for each bit.
An optical medium having 5 mark bits. 10. The optical medium according to claim 2, wherein one mark is arranged at a radial selection position in each servo channel, and various marks are formed in a band for subdividing by a plurality of selected marks. An optical medium whose radial position is defined. 11. The optical medium according to claim 2, wherein the mark is a pit and can be optically sensed by a laser scanner. 12. The optical medium of claim 2, wherein the marks are arranged in alternating adjacent sets. 13. The optical medium of claim 2, wherein the marks are arranged in concentric sets. 14. The optical medium according to claim 2, wherein the number of digits in a band number and the number of fields in a sector have no common prime factors. 15. An optical information storage medium comprising an evenly distributed, time-synchronized and radially offset array of optically sensitive indexes on a polar grid, each containing timing, tracking and address information. . 16. An optical information storage medium comprising scannable means with sensible marks, wherein the marks are evenly arranged within a defined region including a servo channel region and a band region and timing. Is placed in each servo channel area that establishes the, and each mark selectively displays individual values that are time-synchronized in the corresponding servo channel area to establish the band address, and each mark is offset in the radial direction with respect to other marks. An optical information storage medium arranged in a selected pattern to provide logical information regarding subdivision within each corresponding band region. 17. The optical medium according to claim 16, wherein the scannable means is an optical disk. 18. An optical medium according to claim 16, wherein the individual value is 1 or 0. 19. The optical medium of claim 16, wherein the even distribution of sensible marks includes at least one channel without a mark to facilitate synchronization of the medium.