JPS61139984A - Optical disk device - Google Patents

Abstract

PURPOSE:To protect recording information securely by providing a buffer memory for recording data, and interrupting the recording data if a recording error occurs during recording operation and restarting the recording operation after the error is recovered. CONSTITUTION:An input signal to be recorded is supplied to an encoder 8 through a terminal T1. The encoded input signal is written in the buffer memory 10 with a synchronizing signal from a clock pulse generator 9. A PLL which holds phases of a write address counter 11 and a read address counter 12 for addressing the memory 10 constant is composed of a subtracting circuit 13 and a voltage-controlled oscillator 14. when a track error detecting circuit 3 detects a track jump, a recording amplifier 15 is stopped and the clock from the oscillator 14 is cut off by a gate circuit 16. When the spot SP from an optical head 1 returns to its original recording position, the circuit 16 is closed and data stored in the memory 10 is outputted. Thus, the recording is carried on after error recovery to protect the recording information.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a source disk device, and more particularly to a source disk device for ensuring the integrity of recorded information in 44 times when information is recorded on an optical disk. [Prior art] Recently, optical discs are not only playback-only discs, but also
An optical disk device has also been proposed that uses a thin film of tellurium oxide or the like to record additional information in addition to pre-recorded information.

In this case, in general, when recording data on the original disk, if you set sectors on the original disk in advance, check the recorded contents immediately after recording, and if there is an error, rewrite the same data in another sector, etc. Shishi Shiba.

[Problem that the invention seeks to solve]

When rewriting data like this, external photography is added and track skipping occurs, resulting in the same data as the grass and the original correct buttock data being recorded again, especially if the same data is recorded again on the previous track. In case A, it is important to avoid losing correct data.In addition, if the two data to be recorded are continuous like an audio signal, and to reduce the loss of sectors, it is possible to record a pre-group with only track error signals at 71c. Such a thing is common, and if the track error mentioned above occurs, the disk is replaced and the recording is re-recorded. [Means and effects for solving the problem] The present invention has been made in view of the above-mentioned arrangement, and even when recording data such as audio signal information, it is necessary to operate the track data in parallel. The purpose of the present invention is to provide a four-optical disc device that can record continuously without fear of damaging the disc.For this purpose, the present invention monitors track errors during recording, detects noise at this time, and detects when the noise exceeds a certain level. When this occurs, it is assumed that a track error has occurred, and recording is interrupted, the track to be recorded correctly is found, and writing is continued again.40At this time, a buffer memory is created for the data corresponding to the interruption. In order to recover the memory consumed at this time, the recording rate and disk rotational speed are increased so that recording can continue even if errors occur many times.

[Implementation row]

The following describes an embodiment of the invention in Figures 1 to 3. FIG. 1 shows a system diagram of the original disk device of the present invention. In FIG.
(The F signal and the error signals for the servo are taken out. Of these detection signals, the track error signal a and the HF signal by are derived and added to the track error detection circuit 3, where the track error signal avi- is added, and the HF signal b eHF signal is detected. In addition to circuit 5, the track error detection circuit detects the track error detection circuit wr when the track error signal a is higher than a predetermined value.
The detection power C is output as the output of 2.

Detailed circuit of the above track error detection circuit 49 No. 2
Shown in Figure (a). In Figure 2 (a), the track error signal a
Shiba in addition to the comparator 3-1. In this land comparator, two reference voltages +REF and -REF are added, and a track error signal a higher than these reference voltages is detected.
40, that is, as shown in Fig. 3←), the track error signal a is the reference voltage output REFt-threshold level, and the pulse a' is higher than these reference voltages.
can be taken out from the window comparator 3-1 as shown at 03)K in FIG. 3(b). This voltage pulse a' is integrated by an integral detection circuit 3-2, and a detection force C is taken out as shown by Q in FIG. The maximum level of the track error signal may be set lower than the maximum level of the track error signal when moving to

According to this figure, the track can be moved 7' by external vibration.
Tracking errors can be detected immediately even in the case of the first order.Although the integral detection circuit 3-2 can be omitted, by installing this circuit, it is possible to avoid detecting particularly short pulse noise (1) and further improve the beam estimation. Except for signals faster than the moving speed, S/Nt
- You can make a lot of improvements. By using such a track error detection circuit, if the track error detected during writing is an error (4), the Z probability will be 7 & 2.
゜Of course, there is a possibility that it is not a track error, so just in case, I set the 7 flip-flop circuit 4 using the detection power C to completely stop recording, and at the same time activated the track search circuit 6 using the flip-flop circuit output Q. Search for tracks that seem worth recording.

This state will be explained with reference to FIG. 3. First, the HF signal detection circuit 3 detects all HF signals when reproducing information from the optical disc, obtains signals on recorded tracks, and uses these signals for track search. Circuit 6 plus stone. In the case where spot point P jumps to track Ts due to a track error caused by dust, external vibration, etc. when SP reaches point P in the third garden, spot point P jumps to track Ts. Just before it flies off, recording to track T is stopped and the device is in playback mode.

At this time, the track T to which the 22 points were brought is an unrecorded part, so the HF signal detection circuit 5 does not detect the HF signal, and the track search circuit 6 sends one kick pulse to the recording start track side of the optical disc. When the kick pulse is output, the kick pulse is sent to the spot S of the original head 1 via the kick circuit 7.
P? 1) Return the rack to track T4 on the recording start track side. , even in this state) HF from the HF signal detection circuit 5
Since there is no signal, the spot SP goes back one track at a time from T, →T, and when the spot SP reaches P1, information is recorded on the track TL and the HF signal is detected by the HF signal detection circuit 5. Ru. At this point, the track search circuit 6 instructs the kick circuit 7 to output one kick pulse to the side opposite to the starting side.If A4 of the spot 'SP comes to the position of the track T, the HF signal will be generated at this point. Since this point disappears again, this point should be judged as the point at which recording should be restarted.Then, the track search circuit δ outputs the heliset pulse of the flip-flop circuit 4 to return to the recording state and resume recording fjt on the track T3.Zo In the above case, the spot SP moved to the unrecorded track side due to a track error. However, if for some reason the spot SP moves to the recorded side, that is, the tracks T1 to T3 on the recording start side, HF signal is detected 2
Therefore, if the kick circuit is operated until the HF signal is not detected, the track position to start re-recording can be detected.

Next, the configuration for the recording data memory 4 will be explained with reference to FIG. 1 again. T1 is one terminal to which an input signal is applied, and the input signal is encoded into predetermined format data in two ways by the encoder 8 through the terminals T and t.
The encoded manual signal is written into the backup memory 10 by a synchronization signal from the clock pulse generator 9.
i, iA. Here, the address to the buffer memory 10 is inputted in a ring manner by the write address counter 11, and the next reading of the buffer memory 10 is read out by the read address counter 12 with a certain phase delay. It consists of a PLLt-subtraction circuit 13 and a voltage control excavator 14 that keep the phases of the write address counter 11 and read address counter 12 constant, that is, the read address is calculated from the address value of the write address counter 11 by the subtraction circuit 13. Under normal conditions, the address value of the counter 12 is slightly delayed 4 times, and the voltage controlled oscillator 14 is activated based on this value.1. The written data is immediately outputted, a portion of which is sent to the recording amplifier 15, and a signal is recorded on the original disk by the original head 1. Now, if a track jump occurs due to the above-mentioned track error and this is detected, the recording amplifier 15 is stopped and the voltage controlled oscillator 14 is activated. the law of nature. When SP returns to the original track position to be recorded, the gate circuit 16-c is closed and the data stored in the buffer memory is stopped. The value of the successive read address counter 12 is the same as that of the write address counter 11, and is applied to the voltage control excavator 14, and the voltage increases. Therefore, the excavation frequency gradually increases, and the read address counter 11 and write address counter 12 of the backup memory 10 settle to the original stable state count difference. At this time, the output of the voltage controlled oscillator is applied to the disk rotation servo. By outputting this as a reference frequency through the counter 17 and rotating the disk in synchronization with this, no change in the recording wavelength occurs.

〔Effect of the invention〕

Since the invention is constructed as described above, even if an error such as a track shift occurs due to external vibrations during recording, data can be continuously recorded, and in the case of playback, the address number in the recorded data etc. The input data is not temporarily interrupted at the part where the error occurred during the processing, but memory is also provided for reading, and 7 tons of continuous data can be output. Of course, even if a track jump occurs during playback, it can be easily continued by searching for a predetermined address.40 As explained above, even if many errors occur during writing, a large memory is not required. . However, with one error, it takes several meters to several tens of meters to get back to the original track.
It goes without saying that a loop such as the voltage controlled oscillation 614 may be omitted if the number of errors is about m8 and the occurrence of errors is small.

[Brief explanation of the drawing]

Part 1 □□□ is a system diagram of the uninvented system, Part 2 (a) and (b) are track error detection circuits and their waveform explanatory diagrams, and Fig. 3 is a diagram of the original disk to be returned to a predetermined track. Partial plan view. 1...0 source head 20.Signal detection circuit 3φ...Track error detection circuit 4...-Flip-flop circuit 5...HF signal detection circuit 60.Track search circuit 70.Kick circuit 8110.Encoder 9..
・Clock pulse generator 10・11@Buffer memory 11...Write address counter 12---Read address counter 14...11 Voltage i+fli control oscillator 15...Recording amplifier 16...Gate circuit 17...Counter Figure 1

Claims (2)

[Claims] (1) An optical disk device that records continuous signals has a buffer memory for recording data, and if a recording error occurs during recording, the recording data is interrupted, and recording continues after the error is recovered. An optical disc device characterized in that the optical disk device is configured to operate in a manner similar to that described above. (2) The optical disc device according to claim 1, wherein the recording speed is increased so as to recover the buffer memory amount consumed when the recording data is interrupted.