JPH09237464A - Disk and disk device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the matching of recording rate or the number of sectors per frame over the all disks even though disk diameters are different. SOLUTION: When the outermost peripheral diameter of the effective recording area is 114mm for the disk A and 76mm for the disk B, and the innermost peripheral diameter is 54mm for the disk A and 36mm for the disk B, the number of revolution of the disk B is increased to 3/2 times taking the disk A as a reference. Then, to make the number of sectors per frame the same for the large diameter disk A and the small diameter disk B, the number of sectors of the disk B is made to be 2/3 of that of the disk A. By this arrangement, the number of sectors per frame becomes the same even though the disk diameters are different and further the number of rotation are changed. When the disk is the one having such relation as (outermost peripheral diameter + innermost peripheral diameter)/the number of sectors = almost constant, the recording rates or the number of sectors per frame are made in common, resulting to attain the common use of a signal processing system.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk for recording / reproducing image data using the zone CAV method (ZCAV) and a disk device using the disk. More specifically, even in the case of a plurality of discs having different diameters, the number of sectors assigned to one frame of image data is made the same so that the recording / reproducing system can be simplified and high density recording can be achieved. is there.

[0002]

2. Description of the Related Art When a disk type recording / reproducing apparatus (disk apparatus) is used for editing image data, it is necessary to perform variable speed reproduction (slow, fast forward, etc.) of an image signal especially for commercial use. It is known that the CAV method (constant rotation speed) is easier to realize than the CLV method (constant linear velocity) as a disk drive method capable of realizing such a variable speed reproduction mode.

When image data is recorded on a disc, the recording rate of the image data is generally constant. Therefore, the recording wavelength (recording pit length) is different between the case of recording on the inner side of the disc and the case of recording on the outer side. Will change drastically. When the inner circumference side is considered as the reference of the recording rate, the pit length on the outer circumference side becomes long, and the recording on the outer circumference side is wasted accordingly. That is, high density recording cannot be achieved.

It is well known that ZCAV is one that achieves high density recording while following the CAV method.
The scheme is known. The ZCAV system is a recording / reproducing system in which a recording area is divided into a plurality of areas in the radial direction, the same recording rate is controlled in one divided recording area, and the recording rate is different for each divided area. Is.

A well-known disc recorder for business use performs recording from the outer peripheral side to the inner peripheral side of the disc, and simultaneously records from the inner peripheral side to the outer peripheral side. The sum of the recording rates (or the sum of the reproduction rates) is always constant regardless of the recording area (reproduction area).

In practice, in order to simplify the signal processing, the recording area is appropriately divided into concentric circles as described above, and the recording rate is controlled to be the same in each divided area, and recording is performed for each divided area. The rates are different. If such a ZCAV system is adopted, the recording density can be increased even on the outer peripheral side, so that high density recording of image data can be achieved.

[0007]

By the way, recently, disks of the same type, for example, the same magneto-optical disk (MO) are used.
Even discs with different diameters have appeared. Even if the diameters are different, the number of sectors per track is the same, and image data of one frame can be recorded with the same number of sectors in both cases.

However, under such recording conditions, Z
Even if the CAV method is adopted, when the disc diameter changes, the recording density of the large-diameter disc becomes lower than that of the small-diameter disc. This is because the recording wavelength (recording pit length) differs depending on the disk diameter because the number of rotations is the same. As a result, similarly to the CAV system, the recording density of the large-diameter disk becomes lower than that of the small-diameter disk, and it becomes impossible to achieve high-density recording of the large-diameter disk.

It is possible to match the recording wavelength by changing the number of rotations according to the disk diameter, but if this is done, the recording capacity per sector will change depending on the disk diameter. The number of sectors that can be recorded changes. When the number of sectors changes, it is necessary to change the signal processing according to the disk diameter. Therefore, it is impractical to change the rotation speed for each divided area in this way.

Therefore, the present invention solves such a conventional problem and provides a disk device capable of high density recording capable of coping with a plurality of disks having different diameters even in the ZCAV system. It is a proposal.

[0011]

In order to solve the above-mentioned problems, a disk according to the present invention described in claim 1 is a disk for recording / reproducing image data used in a zone CAV system, and has one track. The number of sectors formed varies depending on the disc diameter, and the relationship between the sum of the outermost and innermost diameters of the recording area of the disc and the number of sectors formed on one track satisfies the following conditions. It is characterized by being configured. (Outermost diameter + innermost diameter) / number of sectors = almost constant

According to a fourth aspect of the present invention, there is provided a disc device adopting a zone CAV system capable of recording and reproducing discs having different diameters.
It is characterized in that the number of revolutions is controlled so that the recording wavelength and the recording / reproducing rate are substantially the same, depending on the diameter of the loaded disk.

In the present invention, depending on the disc diameter, 1
Change the number of sectors that make up the track. Specifically, the number of sectors per track of the small-diameter disk is made smaller than that of the large-diameter disk. How much to reduce depends on the above conditions.

The number of rotations of the small-diameter disk is made faster than that of the large-diameter disk as much as the number of sectors is reduced. The ratio is related to the above conditions. Even if the discs have different diameters by changing the rotation speed, the sum of the inner and outer recording rates becomes constant. Further, since the number of sectors of the small-diameter disk is reduced as the number of rotations is increased, the number of sectors forming one frame is the same even if the disk diameter is changed. This allows the signal processing circuit to be shared.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Next, one embodiment of a disk according to the present invention and a disk device using the disk will be described in detail with reference to the drawings.

According to the present invention, it is a high-density disc capable of recording and reproducing by using the ZCAV system, and even if the discs have different diameters, the recording rate and the number of sectors per frame can be matched for all of them. We propose a recordable disc.

Therefore, according to the present invention, the number of sectors formed in one track is varied depending on the disc diameter, and the sum of the outermost circumference diameter and the innermost circumference diameter of the recording area of the disc and the number of sectors formed in one track. The number of sectors of the disk is determined so that the relationship between and is (outermost diameter + innermost diameter) / sector number = approximately constant (1).

The disk sizes of two types A and B will be specifically described below as an example. Incidentally, as shown in FIG. 2, like the CD disc, the A disc is a large diameter disc having an outer diameter of 12 cm, and the B disc is a small diameter disc having an outer diameter of 8 cm. Outermost diameter of effective recording area (mm) Innermost diameter of effective recording area (mm) Disc A: 114 54 Disc B: 76 36

In order for the sum of the recording rates of the inner circumference and the outer circumference to be the same even with different disk diameters, it is sufficient to increase the rotational speed of the small diameter disk B with the large diameter disk A as the reference. In the above-mentioned effective recording area, the rotation speed FB of the small-diameter disk B is as follows. 1 FB = FA * (114 + 54 ) / (76 + 36) = F A * 3/2 ···· (2) that is the large-diameter disk A rotational speed of the small-diameter disk B.
Set to 5 times.

The next condition is that the large disk A and the small disk B have the same number of sectors per frame.

As described above, assuming that the number of sectors per track is the same for both disks A and B, the number of sectors that can record one frame changes because the rotational speeds of both disks change as shown in equation (2). Will end up. When that happens,
The signal processing must be changed depending on the diameter of the loaded disc, which makes the signal processing very complicated.

Even if the disk diameter is different and the rotation speed is changed, the number of sectors constituting one track may be changed according to the disk diameter so that the number of sectors per frame becomes the same. . That is, in the above example, the number of sectors per track of the small diameter disk B may be set to 2/3 of that of the large diameter disk A. In the example of FIG. 2, since the number of sectors of the large-diameter disk A is 6 for convenience, the number of sectors of the small-diameter disk B is 4.

With such a sector structure, the recording rates of both discs and the number of sectors in one frame can be matched. When all of these things are put together, it results in the condition that (outermost circumference diameter + innermost circumference diameter) / number of sectors = almost constant. For example, assuming that the number of sectors per track of the large-diameter disk A is M and that of the small-diameter disk B is M ′, in the large-diameter disk A, (114 + 54) / M = 168 / M = k (k is a constant) ······························································································································································ (3 (/) (+ (+) (+/−) <+ / ················· 4 ················································ </ </ </ <=> / (<+> / + / + / <+> / <=> / <= +>)・ ・ ・ ・ (5) is understood.

By the way, in the ZCAV format, the recording frequency is different for each divided area of the disk in order to match the recording wavelength. In each sector, including the sector mark indicating the sector,
An address indicating a sector and a signal for synchronization pull-in are pre-formatted.

It is desirable that the reproduction frequency from the preformat section is constant over the entire disc in terms of random accessibility and circuit simplification. Therefore, desirably, when the disc rotation speed is varied depending on the disc diameter, the data recording pit length of the preformatted portion should also be varied according to the disc diameter.

In this case, the pit length is determined so that the relationship between the sum of the outermost diameter and the innermost diameter of the recording area of the disc and the pit length satisfies the following conditions. (Outermost diameter + innermost diameter) x pit length = almost constant ... (6)

FIG. 3 shows an example of the structure of the preformat section of both disks. At the same diameter of both discs, the physical pit length of the small disc B is 3 for the large disc A.
Is set to / 2 and the preformat length LB is 3/2 of LA
Becomes

The structure of the preformat section shown in FIG. 3 will be described. FIG. 3 shows an example of a 5 inch MO format of the ISO (International Organization for Standardization) standard. Here, SM is a signal indicating the beginning of a sector, VFO is a preamble signal for pulling in a PLL, and a signal of a constant frequency is recorded. AM is a byte synchronizing signal, and ID is a track and sector address signal. PA is a postamble signal.

By doing so, the reproduction frequency becomes the same over the entire area of the disc, and the commonization of the circuit is further promoted. In other words, the circuit scale can be reduced.

Further, by making the ratio of the outermost circumference diameter and the innermost circumference diameter of the effective recording area the same for each disc, the ratio of the recording image data distributed to the outer circumference side and the inner circumference side is made the same for each disc. You can In other words, this means that the number of zoned areas of the disc can be the same even if the diameters are different. Since the zone division areas are the same, the control system for signal distribution can be shared.

Needless to say, when the inner and outer ratios of both discs are different, the number of zone divisions is made different, or the number of tracks in each zone is made different in one zone area. .

Next, an example of a disk device for recording and reproducing image data using the disk thus devised will be described in detail with reference to FIGS. 1 and 5. FIG. 1 shows a specific example of the recording system 20. The figure shows the case where a magneto-optical disk (MO) 11 is used as the optical disk, and moreover, the case where a double-sided type optical disk capable of recording and reproducing data from both surfaces of the disk 11 is used. Of course, the present invention can also be applied to a disc for recording / reproducing on one side.

As described above, since the present invention uses the ZCAV system for recording and reproducing, the first optical pickup means 21 is arranged on the inner surface of the lower surface of the disc as shown in FIG. The second optical pickup means 22 is arranged at a position facing each other. The first optical pickup means 21 is scanned from the inner circumference to the outer circumference, and the second optical pickup means 22 is scanned from the outer circumference to the inner circumference.

Digitized image data (recording data) is supplied to the terminal 24, is then supplied to the error correction addition circuit 25, is added with an error correction code such as CRCC, and is then supplied to the data distribution circuit 26. It

In the data distribution circuit 26, the data is distributed to two systems (2 channels) of recording channels from the inner circumference side and recording channels from the outer circumference side. At this time, the preformatted portion is reproduced from the disk A (B) by the pair of optical pickup means 21 and 22, and the reproduced signal is the address detection circuit 2.
7 and the track address and sector address are read out in this example.

The address information is the variable clock generation circuit 28.
Is supplied to the data distribution circuit 26 and the signal Sd for distributing the recording data is supplied to the data distribution circuit 26. With this, the distribution ratio of the image data to be recorded is changed according to the zones of the area to be recorded (five zones a, b, c, d, and e are shown in FIG. 1). For example, as shown in FIG. 4, the recording data amount D to be recorded according to the recording zones a, b, c, d, e used.
The distribution ratio of a and Db is determined.

The distributed recording data Da is supplied to the recording rate conversion circuit 30A, and the recording rate for the recording data Da is converted according to the recording zone. This is to keep the sum of the recording rates on the inner and outer circumference sides constant regardless of the recording zone. Since the recording rate depends on the recording zone in which the second optical pickup means 22 is located, the variable clock generation circuit 28 is used.
This is performed based on the rate control signal Sd obtained further.
After that, recording modulation processing is performed by the modulation circuit 31A, and the data is supplied to the second optical pickup means 22 via the recording amplifier 32A and data is recorded from the outer peripheral side of the disk.

The case of recording the record data Db using the first optical pickup means 21 is the same as the case of using the second optical pickup means 22, so that the corresponding circuit has the suffix "A". The explanation is omitted by adding "B" instead of "."

The size of the loaded disk A (B) can be detected by the optical sensor 35. This example shows a disc size discriminating system when two types of discs are loaded.
The outer diameter of the large-diameter disk A is larger than the outer diameter of the large-diameter disk A.

The optical sensor 35 has a light emitting diode and a light receiving diode built-in, and the sensor output according to the size of the disk is supplied to the controller 36, and the rotation speed of the spindle motor 37 for driving the disk is set according to the sensor output. To be done. The controller 36 further sets the number of tracks in the recording zone and the recording time. The configuration of the optical sensor 35 is an example, and it may be configured as a transmissive type as well as a reflective type as shown in the drawing.

FIG. 5 shows an example of a reproduction system 39 for recording data. Explaining the second optical pickup means 22, the data reproduced by the optical pickup means 22 is supplied to the binary discriminating circuit 41A through the reproducing amplifier 40A to be binary discriminated, and the binary data is discriminated by the decoding circuit 42A. It is decoded into image data. At this time, the binary data is generated by the PLL circuit 43 in order to generate the clock signal CKa for decoding.
Clock signal CK supplied to A and synchronized with the reproduced data
a is generated.

The demodulated data is reproduced rate conversion circuit 4
In 4A, rate conversion is performed according to the reproduction zone. Therefore, the reproduction data from the second optical pickup means 22 is supplied to the address detection circuit 27, and the reproduction zone determination circuit 29 outputs the reproduction zone signal based on the reproduced address.

The reproduction rate conversion circuit 44A is supplied with the clock signal CKa, the reproduction zone signal and the reference clock CKO from the reference clock generation circuit 46, and on the basis of these signals, conversion processing reverse to the recording rate conversion is performed. , Is converted (restored) to the original recording rate related to the reference clock CKO.

Similar data processing is performed in the reproduction processing system of the first optical pickup means 21, and reproduction data converted to the original recording rate is output from the reproduction rate conversion circuit 44B. The reproduction data converted to the original recording rate output from the conversion circuits 44A and 44B is supplied to the data integration circuit 47 to be the one-frame data before division shown in FIG. Thereafter, the error correction circuit 48 performs error processing on the data generated during reproduction, and the reproduced image data is output from the terminal 49.

Even in the reproducing process, the spindle motor 37 is controlled to a predetermined rotation speed by the sensor output based on the disc size detected by the optical sensor 35, as in the recording system 20.

[0046]

As described above, in the disk according to the present invention and the disk device using the same, the ZCAV
This is a recording / reproducing system according to the method, in which the relationship between the sum of the outermost diameter and the innermost diameter and the number of sectors is made almost constant depending on the disc diameter, and even if the discs have different diameters, the recording / reproducing rate on the outer periphery side. The recording rate and the number of recording sectors per frame can be adjusted regardless of the disc diameter by setting such that the sum of the recording / reproducing rate on the inner circumference side is substantially constant.

According to this, it is of course possible to achieve high-density recording, and even if the disc diameter is different, it is not necessary to change the signal processing system for recording and reproduction according to the disc diameter, and the signal processing is performed. The system can be shared, and a compatible disk device that can use disks of multiple diameters can be easily realized.

In particular, the reproduction frequency of the pre-format portion is made constant irrespective of the disc diameter and further throughout the disc, or the ratio of the outermost system to the innermost system in the effective recording area is made substantially constant. By doing so, the signal processing system can be further shared.

Further, even a disk device which can be used only for a dedicated disk diameter has a feature that it can be commonly used when integrated into an IC because the signal processing circuit is common to the devices of other disk diameters.

Therefore, when the present invention is applied to a recorder used in a video camera integrated with a disk recorder which is required to be smaller in size than the recording time, a small disk diameter can be used, and a stationary type recording time is prioritized. Since you can use a disc recorder that uses a large disc diameter or a compatible disc recorder, this invention is best suited for applications that require different disc diameters in the same format. is there.

[Brief description of drawings]

FIG. 1 is a system diagram of essential parts showing an embodiment of a recording system in a disk device according to the present invention.

FIG. 2 is a diagram showing a relationship between a disk diameter and a sector.

FIG. 3 is a diagram showing a relationship between preformatted portions according to a disc diameter.

FIG. 4 is a diagram showing an example of data distribution.

FIG. 5 is a system diagram of essential parts showing an embodiment of a reproducing system in the disc device according to the present invention.

[Explanation of symbols]

20 ... Recording system, 21, 22 ... Optical pickup means, 26 ... Data distribution circuit, 27 ... Address detection circuit, 30A, 30B ... Recording rate conversion circuit, 4
4A, 44B ... Reproduction rate conversion circuit, 47 ... Data integration circuit, A, B ... Disc

Claims (5)

[Claims] 1. A disk for recording / reproducing image data used in a zone CAV method, wherein the number of sectors formed in one track is different depending on the disk diameter, and the outermost diameter and the maximum diameter of the recording area of the disk. Inner diameter sum and 1
A disk characterized in that the relationship with the number of sectors formed in a track is configured to satisfy the following conditions. (Outermost diameter + innermost diameter) / number of sectors = almost constant 2. The pit length of a pre-formatted portion which is pre-formatted on the disc at a constant frequency is varied depending on the disc diameter, and the sum of the outermost circumference diameter and the innermost circumference diameter of the recording area of the disc and the pit length. 2. The disc according to claim 1, wherein the relationship with the relation is set to satisfy the following condition. (Outermost diameter + innermost diameter) x pit length = almost constant 3. The disk according to claim 1, wherein even if the disks have different disk diameters, the ratio of the outermost circumference diameter to the innermost circumference diameter of the recording area is substantially constant. 4. A disc device adopting a zone CAV system capable of recording / reproducing discs having different diameters, wherein the recording wavelength and the recording / reproducing rate are substantially the same in accordance with the loaded disc diameters. A disk device, wherein the number of rotations is controlled to be different. 5. The disc device according to claim 4, wherein the disc according to claim 1 is loaded as the disc.