JPS61139933A - Optical disk device - Google Patents

Abstract

PURPOSE:To eliminate the possibility of damaging a recorded data by mistake, at the time of a track shift by an external vibration, etc., by stopping immediately recording and returning it to the original track position, and thereafter, executing the recording, when the track shift has been generated in the course of recording. CONSTITUTION:A reproducing signal, an HF signal and an error signal are fetched to a signal detecting circuit 2 from an optical head 1, and an error signal (a) is applied to a track error detecting circuit 3. A noise of the error signal (a) is detected by the detecting circuit 3, and when the noise has appeared more than prescribed, a detecting output (c) is outputted. By this output (c), an FF circuit 4 is set, recording is stopped temporarily, a track searching circuit 6 is operated by an output Q', and a missing track is found out. In that case, a recording amplifier 15 is stopped, and when a stop SP is returned to the original track, a gate circuit 16 is closed and a data of a memory is outputted. Therefore, even if a track shift is generated due to an external vibration, etc., a recorded data can be prevented from being damaged by mistake.

Description

[Detailed Description of the Invention] [Industrial Application Field] The invention is related to original disks and devices, and in particular, to a disk device for effectively preserving recorded information when recording information on the source disk. 4゜ [Prior technology] Recently, optical discs are not only playback-only discs, but also
In addition to prerecorded n7'2 information using a thin film such as tellurium oxide, a source disk device capable of additional ejection has also been proposed. In this case, in general, when recording data on this type of source disk, After all sectors are recorded in advance on the original disk, the recorded contents are immediately checked and confirmed, and if any errors are found, the same data is rewritten in other sectors.

[Problem that the invention seeks to solve]

When rewriting data like this, external vibrations are added and track skipping occurs, causing the same data to be recorded again as the originally correctly written data. Especially when the same data is recorded again on the previous track. Dear Sui'7!: In some cases, do not damage correct data.Also, if the data to be recorded is continuous like an audio signal, and reduce the loss of sectors, only track error signals should be used. 1) If there is a track error mentioned earlier, the disc is changed and the recording is re-recorded.For this reason, when recording a live performance, multiple original discs are used. [Means and effects for solving the problem] The non-invention was made in view of the above-mentioned damage, and even when recording data such as audio signal information, it is necessary to operate the equipment in parallel. The aim is to obtain a binary disk system*' that can continuously record without fear of data loss.To this end, the present invention monitors track errors during recording and detects noise at this time. However, when the noise appears above a certain level, it is assumed that it is a track error, the recording is interrupted, the track that should be recorded correctly is found, and the next step is 71t.
It's something that keeps on going and contains V@. - Create a backup memory for the 2 data corresponding to the interruption at this time, and increase the recording rate and disk rotation to recover the amount of memory consumed at this time, so that even if errors occur many times, the recording will continue. 6. It is continuous and looks like grass. =.

〔Example〕

An embodiment of the present invention will now be described in detail with reference to FIGS. 1-3. FIG. 1 shows a system diagram of the original disk device of the invention. In Fig. 1, a signal such as a playback signal is input to the signal detection circuit 2 from the original head 1 which can record and play back, and the playback signal and H
The F signal also outputs error signals for the servo. This 1
Among the detection signals, the track error signal a and the HF signal b
2, and add the track error signal a to the track error detection circuit 3, and add the HF signal a to the HF signal detection circuit 5. In the track error detection circuit, when the track error signal a is above a predetermined value, a detection force C is outputted to the output of the track error detection circuit 2.

The specific circuit configuration of the above-mentioned track error detection circuit is shown in FIG. 2 (A). In FIG. 2(a), the track error signal a is added to the total comparator 3-1. In the Kundo converter, two reference voltages RBF and -RIF are applied, and a track error signal a higher than these reference voltages is extracted, that is, as shown in (4) of the third factor (b). As shown, the track error signal a is ±o Reference t Extrusion R
IF? With the threshold level set, these pulses a' that are higher than the reference voltage are taken out from the window comparator 3-1 as shown in Figure 3 ←). It is integrated and the second N (
+: I) (as shown by Q, the detection power C is taken out and the stone is
Here, the reference voltage may be set lower than the maximum level of the track error signal when the original beam moves in the track direction.

As a result, even if the track goes off track due to external vibration, a tracking error can be immediately detected. 4o Also, the integral detector circuit 3-2 may not be necessary, but by installing this circuit, short pulse noise etc. can be detected on the bamboo. It is possible to improve the S/N'i by not detecting signals that are faster than the expected movement speed of the beam. By using such a track error detection circuit, the probability that a track error detected during writing is an error is quite high.2 Of course, there is also a chance that it is not a track error, so in case it is not a track error, there is a high possibility that the track error will be detected. The flip-flop circuit 4 is set by C to stop the recording 4, and the track search circuit 6 is activated by the output Q of the flip-flop circuit to search for a track that seems to have been lost and should be recorded.

To explain this state with reference to FIG. 3, first, the HF signal detection circuit 5 detects the HF signal when information is reproduced from the optical disc, receives the signal on the recorded track, and then outputs this signal. Add to track search circuit 6. At the 3rd N, tracks T1 to T3 of the original disk were removed) When the SP reached the P point, a track error occurred due to the influence of dust, external vibration, etc., and 21 points were brought in at the spot point, and the 9th track T ,
is an unrecorded portion, so no HF signal is detected from the T(F' signal detection circuit 5) and the track search circuit 6 outputs one kick pulse to the recording start track side of the optical disc.The kick pulse is sent to the kick circuit 7. Through this, the tracks T and K on the recording start track side are moved back by the spot 5Pt-1 track of the optical head 1. Even in this state, since there is no HF signal from the HF signal detection circuit 5, the tracks T, K are returned one track at a time one after another. When the spot SP reaches P2, the HF signal becomes H because information is recorded on the track T.
Detection is performed by the F signal detection circuit 5. If the track search circuit 6 instructs the kick circuit 7 to send one kick pulse on the side opposite to the starting side, and the point P1 of the spot SP comes to the position of the track T3, then this is the case. Since the HF signal disappears again 4, this point should be judged as the point at which recording should be restarted.Therefore, the track search circuit 6 outputs a heliset pulse to the flip-flop circuit 4 to return it to the recording state and start the recording to track T6. Resuming recording 4. In the above case, an example was explained in which the spot SP moved to the unrecorded track side due to a track error. If it moves for some reason, the HF signal will be detected and the
Therefore, if you operate the kick circuit until the position where the HF signal is not detected, it will be possible to detect the position of the first track.40 Next, return the configuration for storing the recorded data to the memory shown in Figure 1. To explain, the input signal is applied to the 1T machine and is encoded in 4 ways into predetermined format data by the encoder 8 through the human input signal Fi terminal Tl metal. The encoded manual signal is written into the buffer memory 10 by a synchronization signal from the clock pulse generator 9, and the address to the buffer memory 10 is input in a ring manner by the write address counter 11, and the backer memory 10 is read out by the read address counter 12 with a certain phase delay. The PLLI subtraction circuit 13 and the voltage controlled oscillator 14 keep the phases of the write address counter 11 and read address counter 12 constant, that is, the subtraction circuit 1.
3, the address value of the write address counter 11 and the address value of the serial address counter 12 are slightly delayed in the normal state, and the voltage controlled oscillator 14 is operated based on this value, and the written data is The signal is immediately output and recorded on the original disk by the optical head 1 via the recording amplifier 15. Now, if a track jump occurs due to the above-mentioned track error, the recording amplifier 15 is stopped and the voltage controlled oscillator 1 is activated along with the stone.
The clock from No. 4 is stopped by the gate circuit 16, and the read address counter 12 becomes stopped. Suboc)
When the SP returns to the original track position to be recorded, the gate circuit 16 closes and the SP is stored in the backup memory. 1 no-y,-
2□Kaa2゜22□. . , -1 door address counter 1
When the value of 2' is applied to the stain pressure control oscillator 14 later than the write address counter 11, the voltage increases. The voltage controlled oscillator includes an integral element, so the oscillation frequency gradually increases, and the read address counter 11 and write address counter 12 of the buffer memory 10 settle to the original 1/2 treasure state count difference. At this time, the voltage output and the output of the aa oscillator are transferred to the disk rotation servo controller 7.
By outputting this as the alignment frequency through the counter 17g and rotating the disk in synchronization with this frequency, no changes occur in the recording performance.

[Effects of the Invention] Since the system has been constructed in a way that is completely inventive, even if an error such as a track shift occurs due to external movement during recording, data can be continuously recorded, and in the case of playback, data can be continuously recorded. , the address number etc. in the recorded data is read out, and the manual data is interrupted at 19:00 at the part where an error occurs during recording, but even when the curse starts, it is possible to read out the data as continuous data.

Of course, even if a busy track jumps during playback, it can be easily made continuous by searching for a predetermined address. As explained above, a large memory is not required no matter how many errors occur during writing. However, the distance between two VFs to return to the original track with a single error is about several m3 to several tens of ma,
It goes without saying that a loop such as voltage controlled oscillation s14 may be omitted if the error occurrence is small:J);6.

[Brief explanation of the drawing]

Figure 1 is a system diagram of the present invention, Figures 2 (a) and 2 (b) are track error detection circuits and their waveform explanatory diagrams, and Figure 3 is a part of a ninth optical disc that returns spot money to a predetermined track. The figure below shows 0 1φ bit/original head 2・@-signal detection circuit 3・φ・track error detection circuit 4・φ-7 lip flop circuit

Claims (1)

[Claims] In an apparatus for recording continuous data on an optical disk on which track information is recorded in advance, if a track shift occurs during recording, recording is immediately stopped, and the recording is performed by returning to the original track position. An optical disc device characterized by: