JPH0428065A - Optical recording and reproducing device - Google Patents

Abstract

PURPOSE:To reduce destruction of data and to prevent deterioration of recording capacity, etc., by interrupting recording of data when a light beam is deviated from a track and adding the record of the interrupted data from the deviated position after the interruption. CONSTITUTION:The subject device is provided with an off-track detecting means (tracking error signal comparing circuit part) 11 for detecting deviation of the light beam from a track, an interrupting means (write operation discontinuing circuit) 12 for interrupting the data recording operation when the deviation is detected by the off-track detecting means 11 and a position storage means (recording data buffer) 4 for storing the deviated position. In addition, an additional write means 17-19 is provided to record the recording data after the interruption by moving the light beam after the interruption to the deviated position based on an output of the position storage means 4. Thus, the recording data after the interruption is additionally recorded by moving the light beam after the interruption to the position where the off-track took place. By this method, destruction of data can be reduced, and then deterioration of recording capacity can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical recording/reproducing device for optically recording and reproducing information on and from an optical card or the like.

[Prior Art] Conventionally, in optical recording, defects, scratches, and
The tracking servo may be disturbed by dust or the like, causing the recording/reproducing light to deviate from the track being recorded or reproduced, resulting in poor recording or reproduction.

Playback may be successful by performing retry processing during playback, but there is a risk of destroying data on other tracks during recording.
In the new version, measures are taken to immediately stop recording when a deviation from the track is detected.

Furthermore, Japanese Patent Application No. 63-267303 proposes a system in which a track with such recording defects is replaced and data is written on another track.

Incidentally, an optical card 61 as shown in FIG. 6 is sometimes used as an optical recording medium.

This optical card 61 has a plurality of tracks 62 parallel to each other.
An ID section 63A in which information indicating an address corresponding to each track is recorded at both ends of the ID section 63A.

63B, and the area of each track between these ID sections 63A and 63B is divided by a sector mark 64 into a data section 65 and a replacement information recording section 66. The data section 65 records data to be recorded on the optical card 61, and the replacement information recording section 66 records the data to be recorded on the optical card 61.
5, but cannot be recorded correctly due to a defect on the medium, information to indicate in which data section (other track) the data to be recorded in that data section should be re-recorded. It is designed to record.

FIG. 7 shows the configuration of the track deviation detection signal generating section.

The output signal of the optical detector 68 of the optical head 67 passes through a track error signal generation port 869 to generate a track error signal T.
An IR is generated. This track error signal TAR is input to the comparison circuit section 7o, and this track error signal TI
is out of the range between the upper limit comparison signal Sup and the lower limit comparison signal 5DOW, the comparison circuit section 70 outputs the off-track detection signal T. Output FF.

When the track off detection signal TOFF is output, the write/read operation abort circuit 71 outputs an abort signal S to abort the write or read operation.

P is output to the control circuit section 72.

When this termination signal 5TOP is input, the control circuit section 7
2 aborts (cancels) the write operation in the case of the write mode, and aborts (cancels) the read operation in the case of the read mode.

By discontinuing the write operation, the light emission with high power is no longer performed, and the light emission power is switched to the weak light emission power in the constant read mode. This switching is intended to prevent problems such as overwriting.

In addition, the control opening 72 is a write/read operation abort circuit l@
The discontinuation release signal RIIL is output to the discontinuation signal 57op so that the discontinuation signal 57op can be canceled.

FIG. 8 shows a recording/reproducing apparatus using an optical card 61 described in Japanese Patent Application No. 63-267303.

In this device, data is recorded/reproduced by moving the optical card 61 in the track direction and moving the optical head 81 in a direction perpendicular to the tracks. The optical card 61 is mounted at a predetermined position on a conveyor belt 83 that is passed between pulleys 82a and 82b, and is conveyed back and forth in the track direction by driving a motor 85 by a motor drive circuit 84. motor 85
An encoder 86 is attached to detect the position of the optical card 61 with respect to the optical head 81, and its output is supplied to a sector mark detection circuit 87.

The optical Δ and RAD 81 transmits the writing or reading light from the laser diode 81a to the optical card 6 via the optical system 81b.
1, and the reflected light is made to enter the detector 81c. The output of the detector 81c is supplied to the demodulation circuit 88 to obtain a readout signal, and the focus
The track servo circuit 89 is supplied with a focus error signal and a tracking error signal, which drive the optical head 81 in the focusing and 1~racking directions so that the incident light always follows the track of the optical card 61 in a focused state. control to do so.

The read signal is supplied to the controller 9o to detect the data reproduction signal and track address information, and is also supplied to the sector mark detection circuit i87 to be sent to the encoder 86.
The sector mark is detected together with the output signal of the controller 90, and the sector mark detection signal is supplied to the controller 90.

When reproducing data, the controller 90 causes the laser diode 81a to output low-power reading light via the laser drive circuit 91, and also causes the motor drive circuit 1iIg to output a low-output reading light.
84, controls the driving of the demodulation circuit 88 and the focus/track servo circuit N89, and seeks and accesses a desired track based on the track information demodulated by the demodulation circuit 88.

In addition, when writing data, after seeking the desired track for writing in the same manner as described above, a high-output writing light is modulated by the data to be recorded and output from the laser diode 81a via the laser drive circuit 84. to write data to the track.

When recording data, this apparatus performs the process shown in the flowchart shown in FIG.

When data recording starts, first, the optical head 81 is moved in a direction perpendicular to the track to seek the track to be written, and data is written in the data section 65 of that track.Next, the written data section 65 (read-after-write) and checks whether a write error (error that cannot be corrected) has occurred. If there is no error that cannot be corrected, the process ends, but if there is an error that cannot be corrected, the optical head 81 is sought to a replacement track determined in advance by the system, and the same data is stored in the data section of that track. Record again. Thereafter, read-after-write is performed on this replacement track as well to check for the occurrence of a write error, and replacement is continued until no write errors occur. If the replacement track is recorded correctly, seek to the original track (the track on which writing was first performed) and write the replacement information recording section 6.
6, the replacement information consisting of the track number of the replacement track that was correctly recorded and its error correction code is recorded.

Thereafter, a leave-after write is similarly performed for this substitution information recording section 66, and if there is no error, the process ends.
If there is an error, it is reported to the host computer as an error in the substitution information recording section and the process ends.

In data reproduction, as shown in the flowchart of FIG. 10, the optical head 81 is first sought to a track to be read, and the data portion 65 and alternation information recording portion 66 are read.

At this point, if substitution information is not recorded, the process ends.
If replacement information is recorded, seek is performed to the replacement track where data is recorded as replacement based on the replacement information, the data is read out, and the process ends.

In this way, using the optical card 61 shown in FIG.
We propose a system that makes it possible to record and play back replacement information without significantly reducing the recording area available to the user even in one track/sector, and without requiring any initial processing time when reading the data. are doing.

[Problems to be Solved by the Invention] However, for media such as optical cards, which have a smaller storage capacity than optical disks, and which tend to have dust attached to them, the increased number of replacement processes is a problem with memory storage. This was not desirable because it led to a decrease in capacity.

If a read operation is in progress, the read may be successful by performing a retry process and reading repeatedly. However, if it is removed from the track during a write operation, some data has already been written, so the written data portion will be destroyed and retry processing cannot be performed.

FIG. 11(a) shows the state of the bits in the part where recording was interrupted due to detection of track deviation, FIG. 11(b) shows the state of the entire track at that time, and FIG. 11(C) shows the state at the time of a retry.

When retrying Fig. 11(b), the same Fig. 11(C) appears.
Since double writing is performed as in the example above, the data is almost always destroyed when trying to rewrite the double written part.

The present invention has been made in view of the above-mentioned points, and it is an object of the present invention to provide an optical recording/reproducing apparatus that can sufficiently reduce data destruction and prevent a decrease in recording capacity.

[Means and effects for solving the problem] The present invention includes a means for detecting track deviation during recording, a means for interrupting data recording when this track deviation occurs, and a memory for storing the error at the time of interruption. A means is provided to move the light beam to the position where the track misalignment occurs after the interruption, and additionally record the recorded data after the interruption, thereby reducing data destruction and preventing a decrease in recording capacity. That's what I do.

[Example] Hereinafter, the present invention will be specifically described with reference to the drawings.

FIGS. 1 to 4 relate to a first embodiment of the present invention.
The figure shows the configuration of the first embodiment, Figure 2 is an explanatory diagram of the operation during recording, Figure 3 is a flowchart showing the contents of the beam try process, and Figure 4 is the data from the position where track deviation occurs due to the beam try process. FIG. 4 is an explanatory diagram showing that additional writing is continued.

In the optical recording/reproducing apparatus 1 of the first embodiment shown in FIG. 1, an optical head 3 for recording and reproducing is disposed facing an optical recording medium such as an optical card 2. As shown in FIG. To this optical head 3, recording data from a recording data buffer 4 is modulated by a modulation circuit 6 in synchronization with a write clock signal from a write clock signal generation circuit 5, and is sent to the optical head 3. The intensity of the light beam of the optical head 3 is changed in pulses according to the modulation data, and is recorded on the optical card 2 as a bit string.

In the recording mode, the recording gate signal becomes "H" as shown in FIG. . This write clock signal is also input to the recording byte number counter 9, and when data is recorded, the operation of counting the number of recording bytes from the start of recording starts as shown in FIG. 2(b).

When data is being recorded on the optical card 2 by the optical head 3, the return light from the optical card 2 is received by a photodetector (not shown) of the optical head 3, and a track error signal is detected. , Tracking control of the optical head 3 is performed by this tracking error signal, and as shown in FIG.
This track error signal shown in C) is input to a track error signal comparison circuit section 11, which outputs a track misalignment detection signal when a track misalignment occurs. This track error signal comparison circuit section 11 is composed of, for example, a window comparator, and has allowable levels L1, L2 (second
If it deviates from within the range ((c) 1>), a track misalignment detection signal is output to the write operation abort circuit 12. When the write operation abort circuit 12 receives the off-track detection signal, it outputs an abort signal for stopping the write operation to the gate 7 via the inverter 13, as shown in FIG. 2(d). The AND gate 7 is closed and the write operation is stopped.

When the write operation stops, the number of recorded bytes counter 9
stops counting the number of recorded bytes until the write operation stops.

Note that the recording byte number counter 9 and the reproduction byte number counter 1
Since the reproduction byte counter 14 is initially set to zero, the comparator 15 to which each count value of 4 and 4 is input is normally "H", and when recording starts, the recording gate signal and write clock are input. The signal passes through the AND gate 16 and is input to the recording data buffer 4 and the recording byte number counter 9.

When the write operation is stopped (interrupted), a retry process for writing again as shown in FIG. 3 is performed.

First, seek is performed again on the track where the track has been misaligned, and data is reproduced (read).

In other words, the data read by the optical head 3 is demodulated by lN
17, demodulated, and stored in the reproduction data buffer 18. During this demodulation, a clock component in the data is extracted to generate a self-clock signal, and the self-clock signal is inputted to the reproduced byte number counter 14 and the reproduced data buffer through the AND gate 19, respectively.

In this case, the recording gate signal is at the "L" level and becomes the "H'" level after passing through the inverter 21, so the self-clock signal passes through the AND gate 19 and is output.

After being cleared, the reproduced byte number counter 14 counts the input self-clock signal and outputs the counted value to the comparator 15.

Note that the recording byte number counter 9 and the reproduction byte number counter 14 also count, for example, one pulse output per byte.

Therefore, the count value RC by the playback byte number counter 14
During a period when WC is smaller than the count value WC of the recording byte number counter 9, that is, during a period when WC>RC (or the number of recorded bytes>the number of reproduced bytes), the output of the comparator 15 is "L",
This data reproduction operation is repeated.

When the playback operation (playback retry process) is repeated in this way and the number of playback bytes matches the number of recording bytes, the comparator 15 becomes active (that is, "H"), and the recording gate signal becomes "H". Switch to recording mode.

Data from the recording data buffer 4 is then sent to the modulation circuit 6 in synchronization with the write clock signal and recorded on the optical card 2 via the optical head 3. In this case, the data read from the data buffer 4 is set such that the address value becomes the recording byte number counter value (for example, the output of the recording byte number counter 9 is output to the controller and stored, and when additional recording is performed, (The read address of the buffer 4 is read from a position shifted from the storage position of the recording byte number counter 9.) Therefore, the data to be recorded starts from the data that caused the track misalignment.

FIG. 4 shows a bit string that continues to be written after the retry process. In this figure, the fist indicates the write bit when the track is off, and O indicates the write bit written during the retry.

If track misalignment occurs again during the retry process, the recording byte number counter 9 will stop again and recording will be interrupted, so the retry can be repeated as many times as desired.

According to this first embodiment, by performing a pasting trial process on a track where a recording defect has occurred, it is possible to correct the data with the track misalignment by adding data to the data without the track misalignment, so that the number of defective tracks can be reduced and the recording capacity can be increased. can prevent a decline in Furthermore, since the number of alternate processing tracks can be reduced, access time can also be improved.

FIG. 5 shows a block diagram of a control circuit 25 of the optical recording medium transport means according to a second embodiment of the present invention.

When a drive direction signal and a drive signal control command are inputted to the ROM 25A of this control circuit 25 from, for example, the controller 90 shown in FIG. 8, the address of this ROM 25A is determined, and the drive data (speed target value)
is supplied to the motor 26 which refines the conveyance means through the D/A converter 25B and the power up 25C. Thereby, the motor 26 reciprocates the shuttle 28 attached to the pulley 27a, so that the optical card 61 on the shuttle 28 is transported back and forth. The A-phase and B-phase outputs of a rotary encoder 29 coaxial with this motor 26 are input to a direction discriminator 25D.
The value of an up/down counter 25H indicating the position of the shuttle 28 with respect to the optical head 3 is updated by the output signal indicating the conveyance direction of the shuttle 28 from 5D, and the value of the up/down counter 25H indicating the position of the shuttle 28 with respect to the optical head 3 is updated. The speed is controlled so that the difference becomes zero.

The output data of the ROM 25A changes from acceleration data to low speed data when the shuttle 28 passes through the acceleration area, that is, when the value of the up/down counter 25H exceeds the distance value of the acceleration area, and changes from low speed data to deceleration data when it enters the deceleration area. After that, when the value of the up/down counter 25H reaches a predetermined value, data of zero speed is output,
Transport of the shuttle 28 is stopped.

In the first embodiment, the data position was recognized using the write clock and the self-clock for reproduction, but in the second embodiment, the output of the rotary encoder 29 is used instead of these clocks. ing. The output of the rotary encoder 29 is input to a recording counter and a reproduction counter (not shown). As these counters, the recording byte number counter 9 and the reproduction byte number counter 14 shown in FIG. 1 can also be used. In this case, a switching means may be provided so that the output of the rotary encoder 29 is input to the recording byte number counter 9 during recording, and is input to the reproduction byte number counter 14 during retry.

The recording counter memorizes the encoder position when track misalignment occurs, and at the time of retry, recording is restarted when the count value of the reproduction counter matches the count value of the recording counter, thereby making additional writing possible.

Although the second embodiment has been described using the rotary encoder 29, it is obvious that other means or devices such as a linear encoder may be used as long as the position can be recognized.

The effects of this second embodiment are almost the same as those of the first embodiment.

As a modification of the second embodiment, the up/down counter is 1
The position output can be done by the CPU (not shown).
exposed. First, the position when the deviation occurred during the recording operation is memorized, and then additional writing is performed when the up/down counter indicates an output that matches the memorized position when the deviation occurred during additional writing. may be started.

For example, when retrying to add a bit to a bit that was out of track as shown in Figure 4, the desired position may be determined depending on the timing of switching from read (verify) to write, emitting light, and adding the bit. It is possible to deviate from the

In this case, check in advance the lag between the time when the light beam scans the bit and the time when this bit is electrically detected after passing through the demodulation system, and take this lag time into account when writing additional data. All you have to do is set .

Incidentally, in the above embodiment, the position of track deviation, etc. is detected in units of one byte, but it may be counted in units smaller than this.

Incidentally, when data reading fails, when reading the failed data again, for example, the focus state may be slightly defocused and a bias voltage may be applied. ) Bits displaced from the center of the track may also be readable.

Note that the present invention can also be applied to optical recording/reproducing devices using optical storage media other than optical cards.

``Effects of the Invention'' As described above, according to the present invention, there is provided a track-off detection means for detecting deviation from a track on which a light beam is irradiated, and a means for interrupting data recording when track-off occurs. , a storage means for memorizing the deviated position is provided, and after the interruption, the recording of the interrupted data is added from the deviated position, so the number of defective tracks can be reduced and a decrease in recording capacity can be prevented. can.

[Brief explanation of the drawing]

FIGS. 1 to 4 relate to a first embodiment of the present invention.
The figure is a block diagram of the optical recording and reproducing apparatus of the first embodiment, FIG. 2 is a timing chart explaining the operation during recording, FIG. 3 is a flow chart showing retry processing, and FIG. 4 is a retry processing for a track. An explanatory diagram showing how bits are additionally recorded, FIG. 5 is a configuration diagram of the main part of the second embodiment of the present invention,
FIG. 6 is an explanatory diagram showing an optical card, FIG. 7 is a block configuration diagram of a device that detects off-track and terminates write and read operations, FIG. 8 is a configuration diagram of an optical recording/reproducing device in a prior example, and FIG. 9 and 10 are flowcharts showing the contents of each operation during recording and reproduction in the prior example, and FIG. 11 is an explanatory diagram showing that data is destroyed by double writing due to try processing. 1... Optical recording/reproducing device 2... Optical card 3...
Optical head 5...Write clock signal generation circuit 6/9:'A circuit 9...Reproduction byte number counter 11...l.Rack error signal comparison circuit section 12...Write operation abort circuit 14...Reproduction Byte number counter 15... Comparator 17... Demodulation circuit Figure 6 Figure 7 Figure 10

Claims (1)

[Claims] 1. An optical recording medium, a recording means for recording recorded data read from a data storage means for storing recorded data by irradiating a light beam onto a track on the optical recording medium, and the above-mentioned In an optical recording and reproducing apparatus having a scanning means for changing the relative position of an optical recording medium and a light beam, the track deviation detection means detects when the light beam deviates from the track; means for interrupting the data recording operation when a data recording operation is detected, a position storage means for storing the deviated position, and a means for moving the light beam to the deviated position based on the output of the position storage means after the interruption; 1. An optical recording/reproducing device comprising additional writing means for recording later recorded data. 2. The optical recording and reproducing apparatus according to claim 1, wherein the position storage means stores the number of bytes of completed recording. 3. The optical recording and reproducing apparatus according to claim 1, wherein the position storage means stores an output from a position recognition means of the transport means for the optical recording medium.