JPS5819766A - Recording and reproducing system of recording disk - Google Patents

Abstract

PURPOSE:To record the information as much as possible and at the same time to reduce the searching time, by detecting that a pickup reaches the position which is inside by nearly a prescribed width from the terminal edge of the recorded part of the readout signal, and stopping the quick forwarding action. CONSTITUTION:The width in the direction of a recording enable disk radius is set at a constant value W0, and the width W1 is slightly larger than the maximum quick forward distance of one time which is obtained in the forward mode of the disk radius direction between a recording disk and a pickup in the reproduction mode. In such case, the information is performed so as to set the recording width is set at W1 for the readout signal showing the termination of the recorded part of the information in case of WS<=W0-W1 (WS: width of the recorded part of information. While the part of W0-WS is defined as the recorded part of the readout signal in the case of WS>W0-W1. At the same time, the minimum width of the recorded part of the readout signal is set at a prescribed width W2 which is larger than a distance during the pickup receives a stop command of the forward action and stops the action.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording/reproducing method for a recording disk, and more particularly to a recording/reproducing method for a lead-out signal on a recording disk.

In recent years, optical recording disks have become available as recording media that can record information at high density, but in order to achieve higher density, instead of a constant rotational angular velocity type like conventional music records, it is possible to record information at any radial position. A disk with a constant linear velocity (Con5t) in which the linear velocity in the recording track direction is constant.
ant Linear Velo-cityDisc,
A method called "CLV disk" (hereinafter abbreviated as "CLV disk") is becoming popular. In addition, by recording digital signals such as PCM signals on such high-density recording media, it is possible to use it as a music record that has good sound quality and can be recorded for a long time, or as a high-density memory. There is a lot of research going on. Since the track pitch of such discs is very narrow, usually around 1 to 2 μm, in order to find the desired information position on a playback device (hereinafter abbreviated as search), the track pitch is usually 1 to 2 μm, so in order to find the desired information position on a playback device, it is necessary to convert it to a digital signal at the time of recording. Nine pieces of address data for searching are recorded between the time series of information data such as musical tones, and when searching, this address data is read and the relative relationship between the current position and the position to be searched is known. The desired search position is reached by repeating several times the operation of moving the disk and pickup appropriately in the radial direction using the fast-forwarding means, that is, performing the fast-forwarding operation in the same direction toward the outer periphery of the disk or in an appropriate direction toward the inner periphery. One possible method is to do so. Furthermore, it is naturally possible to perform a fast-forward operation not only for such a search but also for simply changing the radial position at which reproduction is desired.

On the other hand, in the case of CR and V disks, if the track radius differs, the number of rotations of the disk required to obtain a predetermined linear velocity differs. Therefore, as described in -1-, when changing the track radius by instep feeding, it is also necessary to change the disk rotation speed accordingly, and this rotation servo is required (hereinafter referred to as spindle servo). . As a method for performing spindle servo during fast-forward operation, the inventor of the present application has proposed a method in which the clock frequency is extracted from the playback signal obtained from the pickup during fast-forward operation, and this clock frequency is kept constant by rotating the disk. For details, please refer to Japanese Patent Application No. 56-5899.
No. 5,000 and No. 5,901.

According to these methods, it is possible to perform spindle servo during feeding, but if the pickup deviates to a non-recording area during fast forwarding, the servo signal for performing spindle servo will not be activated. The spindle servo goes out of control.

Generally, the track radius of the starting position of information on a disk-shaped recording medium is mechanically determined by the format.
The track radius at the end position of information depends on the amount of recorded information and is not constant. Therefore, it is not possible to know the track radius of the end position of information in advance, and to know the current playback track radius using a mechanical detection method to prevent the playback position from protruding into areas where no information is recorded. . In addition, even if a lead-out signal in a predetermined format determined by the format is recorded for a predetermined width after the end of information on a disk-shaped recording medium, in order to increase the density of information, the amount of information is reduced as in the lead-out signal. Signals that are not involved are often skipped and are not recorded for a long time. On the other hand, when trying to search for a certain information location, depending on the relative relationship between the current location and the location you want to search, move the disc and pickup relatively to the location you want to search using fast forwarding means, read the address data, and then If the address data has not been sent to the desired position, then fast forward in the same direction again, and if the address data is found to have passed the desired position, read the address data while going back little by little in the opposite direction. If you use this search method, if there are many absolute addresses such as digital audio discs where the addresses are in the form of tracks, minutes, seconds, etc., the distance to be fast-forwarded at one time is less than the width of the lead-out signal. 2, the lead-out signal may not be read and the track may extend into an unrecorded area.

For example, on a disc where information is recorded from the inner circumference to the outer circumference as shown in Figure 1, an attempt is made to search from the current position a near the inner circumference to a destination position that is very close to the end position of the information. Even if the last read address C is just before the destination address h, if the song numbers of C and h are different, you won't know that you are just a little bit closer to the destination, so the next fast-forward will be As before, it will be performed in the outer circumferential direction with a width that is two inches wider than the width of the lead-out signal, and then it will stop to read the address iW.
ct becomes a portion without a track. If you want to avoid protruding from the track in this way, it is obvious that the distance of one 5th feed must be less than the width of the leadout signal, but if you do this, you will have to search while reading the address very carefully. Therefore, when trying to search from the innermost circumference to the outermost circumference, the search time becomes extremely long. For example, if the innermost radius is 23 mm, the outermost radius is 58 mm, and the width of the IJ-door signal is 0.5 mm, then the addresses should be written at intervals of 0.5 mm or less from the innermost radius to the outermost radius. If you have to read an address more than 70 times, and it takes, say, 50m5 to read an address once, the time it takes to read the address until you realize that you have passed the destination location is The total sum alone takes 35 seconds or more, which is not a good thing for realizing a quick search.

This is an example of the above number (iIi?)'I-, but if the width of the lead-out signal is narrow and you want to prevent the lead-out signal from interfering with Since the distance cannot be long, the search time increases, which is an obstacle to providing an easy-to-use disc player.

In the numerical example in -1-, if the width of the readout signal is, for example, 35 lungs, if the address is read at intervals of 3.5 mm or less from the innermost circumference to the outermost circumference, it will be read out more than 10 times. Since all you have to do is read the address, and you know that you have passed the target position, the total time spent reading the address is just over 0.5 seconds, which is considerably shortened, but information signals such as lead-out signals Recording signals that are not available over a large range leads to a decrease in the amount of information, which is not suitable. In particular, in the case of a disc where recording is performed from the inner circumference to the outer circumference, the lead-out signal will be recorded in an area with a larger radius than the outer circumference, and if it is a CI/■ disc, the lead-out signal will be recorded in an area with a large radius near the outer circumference. The presence of a lead-out signal having a lead-out signal results in a significant reduction in the maximum recordable information i1:.

Another method is to record the lead-out signal in the entire remaining area that can be formed by the l-rack when there is little information to be recorded. In other words, it is possible to consider a method in which the radius of the end of the track is always constant, but this would result in a significant increase in the mastering time of the disc. For example, if you want to record 5 minutes of information on a recording disc whose maximum recordable time is 60 minutes, and if all 55 minutes after this 5 minutes of information are used as a lead-out signal, then
The mastering time, which should normally take just over 5 minutes, now takes 60 minutes, which is 9 inconvenient. In FIG. 1, 1 is the center of the disk, 2 is the innermost recording track, 3 is the information recording section, and 4 is the innermost recording track.
5 indicates a lead-out signal recording portion, and 5 indicates an unrecorded portion.

The present invention provides a recording method for a recording disk that can record as much information as possible on a recording disk whose recording track format area is limited, can expect a short search time, and does not cause an unnecessary increase in mastering time, and its reproduction. The purpose is to provide a method.

In the recording method according to the present invention, the width of a recordable disk in the radial direction is a constant value W. This is a recording method for recording discs that is defined as ~ ■ 1, which is a constant width that is smaller than the maximum fast-forward distance of one time during fast-forward operation in the disc radial direction between the recording disc and the pink-up during playback, and the information If the width of the recording portion is W8<(-Wl), the recording width of the lead-out signal indicating the end of the information recording portion is recorded to be a constant width W1, and then the recording is performed. -W, then W. -W
The part 8 is designated as the recording part of the lead-out signal, and the minimum width of this lead-out signal recording part is set to a predetermined width W2 that is longer than the distance traveled by the pick-up from when the fast forward operation stop 1- is commanded until it stops. The feature is that it can be set to .

In the reproduction method according to the present invention, the relationship between the valley widths Ws and WL of the information recording section and the IJ-door signal recording section is W1≧W. - This is a forward playback method for recording discs recorded in such a way that yellow W2 is produced, and the characteristic of this is that the pickup is located approximately a predetermined width W2 inward from the end i/ihi edge of the lead-out signal recording area. It is characterized in that the rapid forward movement is stopped upon detecting that the position has been reached.

Hereinafter, the present invention will be explained using the drawings.

FIGS. 2(A) to 2(A) are partially enlarged views of the periphery of a recording disk used to explain each embodiment of the present invention, and for the sake of simplicity, all portions that should be circular arcs are shown as straight lines. 1, and parts equivalent to those in FIG. 1 are designated by the same reference numerals.

For recording discs, the recordable radial width is generally determined, and if this is W; (constant), then
The relationship between the radial width (hereinafter simply referred to as width) Ws of the information recording portion to be recorded and the width of the lead-out signal recording portion is always ≦Wo.
・(1) must be satisfied. Therefore, when there is little information to be recorded, the width of the lead-out signal can be made sufficiently large, but as mentioned above, the mastering process is too difficult. Therefore, in such a case, the recording width W1. of the read access l- signal. is set to a constant value W and recorded, an example of which is shown in FIGS. 2(A) and 2(B). That is, in (A), the case of the relationship XAl5<Wo-Wl (2) is shown, and in (B), the following relationship is shown:
, . . . (3) is shown. Note that line 6 indicates the end edge of the area where recording tracks can be formed.

Here, the constant width W as the lead-out signal recording width, (
is set to a value that is smaller than the maximum fast-forward distance of one time during fast-forward operation in the radial direction between the disc and the pickup of the playback device.

Therefore, when the playback device performs a search toward the outer circumference of 19, the fast-forward operation is stopped every width W,' that is slightly smaller than the width Wl, and the address data is determined, and the current address is determined to be the target address. It is determined whether or not the object has jumped over the area, and if the object has not jumped over the area, the object is rapidly moved again in the same direction by the width W1'. By doing this, even if the target address is outside the last read address f, the next stop position will always be point I in the lead-out signal recording section 4, and the lead-out signal will therefore be read. It is determined that the destination address is between f and 1. Therefore, the pink amplifier never deviates to the unrecorded portion 5.

Next, the amount of information to be recorded becomes a dog, wS > w,,
-w, ,,, ・14) Since it is necessary to always satisfy equation (1), the width WL of the lead-out signal recording portion 4 becomes smaller accordingly, and W, ) pull -W. -W8...(5). In such a case, the lead-out signal is recorded at a width of Wo-W8, but the minimum value thereof is set to a predetermined width W2. This W2 is set to a value that is slightly larger than the distance that the pickup moves from when the fast forward stop command is issued until it stops. That is, Wl>Wl, -W. −W8≧W2 ・・・・・・
(6) It is set in a similar relationship.

In the case of the relationship shown in equation (4) or equation (6) above, the playback device detects that the pickup has reached a position inside the lead-out end edge 6 by approximately a predetermined width W2 and stops the fast-forward movement. A structure is adopted that applies a brake to the pink-up movement that should occur.

Figure 2 (Q, CI)) shows an example of the relationship shown in equation (6) above in winter, where Wl, -W, -w8>w2...
...(7) W4, "=Wo-Ws" W2 ・
--This is the case of (8). A line 7 indicates a portion corresponding to a position inside the terminal edge 6 of the lead-out signal recording portion 4 by a width W2.

In both figures (C) and (D), if the target address is outside the last read address f, then
Normally, next time, a fast-forward movement would be made by the width Wl' and it would deviate from the recording area, but in this example, a position 7 located inside by the width W2 from the end edge 6 of the lead-out signal recording area 4 is picked up. When the pick-up passes, a crack is detected, and the fast-forward movement is stopped instantaneously, and a brake is applied to the movement of the pickup. Here, since the width W2 is selected to be slightly smaller than the distance traveled by the pickup when it is stopped by the brake, the pick amp will not deviate from the unrecorded area 5.

For example, if the rapid traverse speed is 30mm/sec and the deceleration due to the brake is 1G (these numerical examples are fully achievable), the distance traveled by the pickup is 46 l.
It is about tm. Therefore, W2 is at most 100
μm is sufficient, but in reality, there is an eccentricity between the center of the recording track and the center of the recording disk, which is usually 50 μm.
~100 μm, so the width of W2 is 100 μm.
ltm or more is required, and a width of 0.3 to 0.5 mm is appropriate.

As another example, as shown in FIG. The readout signal 4 can be read without fail by setting the position about 1 mm inside from position 7 and setting the fast-forward distance at one time to about 03 when outside position G.
This means that the detection accuracy at position 7' may also be low.

As mentioned above, the distance of one fast-forwarding can normally be the width W1' which is smaller than the width W1, so for example)
If it is 4 mm, W1' will be about 3.5 rrrm. Therefore, even if the width W8 of the information recording portion 30 is 35 mm at most, reading the address a maximum of 10 times will result in the address being within at least 3.5 mm of the target address.
Even if such a method is used, if the target address is outside position 7' (+111), reading an address that is at most 15 degrees will get within at least 0.3 mm of the target address. I understand that.

If it is found that the address is within at least 3.5 mm of the target address, then by reading the address at intervals of 0.5 mm, e You can see that it is in position. Therefore, the number of addresses read until this stage is reached is approximately 17 times at most. If the readout signal is always 0.5 mm wide, read the 35 mm recording width at 0.5 mm intervals until you find that you are within at least 0.5 mm, IJ, of the target address. Since about 70 readings are required for this, the effectiveness of the read-already/signal recording method according to the present invention can be understood (1,)15-.

Also, the maximum amount of information that can be recorded is this example (in C, W2 is 0).
．． It is clear that there is no difference between the case where the lead-out signal recording width is always 0.5 mm and the case where the lead-out signal recording width is always 0.5 mm. It is also clear that the ring time can be shortened.

FIG. 3 is a block diagram illustrating the reproduction method of the present invention, in which a clock extraction circuit 21 selectively extracts only clock components representing phase information from the reproduction signal from the pickup 20. Since this circuit 21 has a PLL (phase locked loop) circuit configuration, it is possible to generate a signal synchronized with the reproduced clock signal even during fast forwarding by the so-called flywheel effect of the PLL circuit. The reproduced signals are phase-compared with the base signal vr in a phase error generating circuit 22, and an error signal is generated. Based on this error signal, a spindle motor (not shown) is rotationally controlled via a spindle motor drive circuit 23, and disk rotation is controlled so that the linear velocity is approximately constant even during fast forwarding.

For fast forward control ((a control circuit 25 is provided,
In response to the fast forward 9 command signal, the pickup is controlled so that the distance traveled in the disk radial direction is the distance per WW,'. Each time, the address information is read and compared with the target address, and control is performed according to the difference. On the other hand, a position detector 24 is provided to determine the position of the pickup 20 in the disk radial direction, and detects this at the moment the pickup crosses position 7 or 7' shown in FIG. 2 and generates a detection signal. For example, a potentiometer or the like may be used. The fast forward control circuit 25 responds to this detection signal and applies a brake to the pickup.

As described above, according to the present invention, it is possible to effectively maintain the amount of information recorded on the disc, reduce the masking time, and perform a search in a short time.

[Brief explanation of drawings]

Figure 1 is a diagram illustrating the movement of the pickup during fast forwarding at the end of the recorded portion of the recording disc, and Figure 2 (A1-(
3 is a diagram illustrating each embodiment of the recording method of the present invention, and FIG. 3 is a schematic block diagram illustrating the reproduction method of the present invention. Explanation of symbols of main parts 3...Information recording part 4...Lead-out signal recording part 5...No record sickle part 20...Pickup 2
4...Pickup position detector 25...Fast forward 9 control circuit Applicant Pioneer Corporation Agent Patent attorney Motohiko Fujimura 19-

Claims (2)

[Claims] (1) The width of a recordable disk in the radial direction is a constant value W. This is a recording method for a recording disc, in which Wl is a width that is a little more than the maximum fast-forwarding distance of one time during multiple fast-forwarding operations in the disc radial direction between the recording disc and the pickup during playback, and the information recording portion is The width of 1 hang is ■18≦W
If o-W1, the recording width of the lead-out signal indicating the end of the information recording portion is recorded so that it becomes Wl, and W8>Wo
-W, then W. -Ws is set as the lead-out signal recording section, and the minimum width of this lead-out signal recording section is set to a predetermined width W2 that is longer than the distance that the pickup travels from when the fast forward operation stop command is given to when the pickup is stopped. A recording method that is characterized by being set. (2) The width of the recordable disk in the radial direction is a constant value W. , and the width is Wl, which is wider than the maximum fast-forward distance of one time during fast-forward operation in the disk radial direction between the recording disk and the pickup during playback, and furthermore, the width is Wl, which is wider than the maximum fast-forward distance of one time during fast-forward operation between the recording disk and the pickup in the disk radial direction. When the predetermined width is W2, which is longer than the distance traveled, the relationship between the width W8 of the information recording portion and the recording width W1 of the lead-out signal indicating the end of this information recording portion is ~VI≧幌,
-W. - A fast-forward playback method for a recording disk recorded such that W8≧W2, and detecting that the pickup has reached a position approximately within the predetermined width W2 from the end edge of the lead-out signal recording portion; A method characterized in that the fast forward nine movements are stopped.