JPS6132241A - Optical information recording method - Google Patents

Abstract

PURPOSE:To provide an automatic error recovery step and advance re-operation smoothly by erasing an area including where abnormal approach to a track occurs in such as case and performing recording operation again. CONSTITUTION:If a main beam spot 501A approaches a track 502 which is one turn before abnormally during recording and an abnormal approach signal NS goes up to a high level, a control circuit 107 stops the modulation of a laser 109 and interrupts the recording. Then, the control circuit 107 operates a motor 105 by a motor drive control circuit 106 to move a magnet 104 for erasure to an area N and also operates a motor 103 similarly to move the main beam spot 501A to the head of an area (n). In this state, the control circuit 107 increases the output of the laser 109 up to at least the output during recording and thus raises the temperature of a part irradiated with the main beam spot 501A and when this temperature rises to the Curier point, record is erased with the magnetic field produced by the magnet 104 for erasure. Thus, an optical head 102 is moved to erase information is the area (n).

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for recording and reproducing information using a light beam.
In particular, the present invention relates to an optical information recording method that performs a recovery operation after a recording error occurs.

[Prior art]

Optical information recording and reproducing devices that record and reproduce information using light beams have attracted particular attention in recent years because they can record a large amount of information at high density and reproduce it at high speed.

However, due to high-density recording, if the beam spot is subjected to external shocks or other vibrations during recording, the beam spot being recorded may come abnormally close to an adjacent recorded track, or even cross. There were problems such as storage.

In order to solve this problem, an optical information recording device has been proposed that is provided with means for detecting abnormal approach of a track (Patent Application No. 58-12654).

FIG. 4 is a schematic circuit diagram showing an example of a tracking control section having means for detecting abnormal approach of a tiger or roe.

In FIG. 4, a light detection unit 401 receives reflected light or transmitted light (described later) from an information track of an optical disc (not shown). Photodetector 4 of photodetector section 401
01A receives light corresponding to recorded information, and photodetectors 401B and 401C receive light for tracking control.

The photoelectrically converted and output currents of photodetectors 401B and 401C are converted into voltages by current-voltage conversion circuits 402 and 403, respectively.

These two voltages are respectively input to the differential amplifier 404, and the differential amplifier 404 outputs a voltage corresponding to the difference between the two voltages to the phase compensation circuit 4.
Output to 05. The output of the phase compensation circuit 405 is input to the drive circuit 407 via the switching transistor 406. A tracking mirror (not shown) is operated by the output TS of the drive circuit 407, and tracking control is performed.

Note that the switching transistor 406 is turned on and off by a signal from a control unit (not shown).
It is on during playback and off during recording.

Further, the output of the current-voltage conversion circuit 403 is output to a comparator 408.
A reference voltage V is inputted to one input terminal of the input terminal, and a reference voltage V is inputted to the other input terminal. When the output voltage from the current-voltage conversion circuit 403 deviates from the reference voltage V, the comparator 408 outputs a high level to one input terminal of the delay circuit 409 and the AND/DART 410.

The delay circuit 409 delays the high level input from the comparator 408 by a predetermined clock period and outputs the delayed signal to the other input terminal of the AND/DART 410 . By providing this delay circuit 409, cases where the high rail output from the comparator 408 is instantaneous noise due to dents, scratches, etc. on the disk are eliminated. AND gate 410 sets abnormal approach signal NS to high level only when high level is input from comparator 408 and delay circuit 409.

The operation of the tracking control section having such a configuration during recording will be briefly explained using FIGS. 5(N and 5(B)).

FIG. 5(A) is an explanatory diagram of the positional relationship between the optical disc's tiger, the rim and the three beam spots during normal recording, and FIG. 5(B) is an explanatory diagram of the same positional relationship during abnormal approach. It is.

In FIG. 5(4), the optical disc rotates at a predetermined speed in the direction of the arrow, and recording is performed using the main beam spot 501A. Here, the main beam spot 501A is located a predetermined distance away from the previously recorded track 502, and a new track 503 is being formed.

Further, the trailing beam spot 501B and the leading beam spot 501C are arranged to be biased to the left and right with respect to the main beam spot 501A. Therefore, the trailing beam spot 501B irradiates the rack 503 and the unrecorded portion equally, and the leading beam spot 501C irradiates only the unrecorded portion.

In relation to the circuit diagram of FIG. 4, the trailing beam spot 50
The reflected light of 1B is incident on the photodetector 401B, and the reflected light of the preceding beam subbox 501C is incident on the photodetector 401C. Also, during playback, the main beam spot, ) 501A
The reflected light enters the photodetector 401A. Comparator 408
The reference voltage V applied to one input terminal of is set equal to the output voltage of the current-voltage conversion circuit 403 when the beam spot 501C is irradiating only the unrecorded portion. Therefore, in the normal recording state shown in FIG. 5(A), the comparator 408 does not output 71 repeats.

Next, a case where the main beam spot 501 during recording abnormally approaches the adjacent tiger 502 due to external vibrations or the like will be explained using FIG. 5(B).

When the main beam spot 501A approaches the truck 502, the beam spot 501C first approaches the truck 502.
begins to irradiate. With this, Beamsbok) 50
The reflected light from 1C changes, and the output voltage of the current-voltage conversion circuit 403 deviates from the reference voltage V. As a result, the comparator 408 outputs the NO level, and if this high level output continues for a predetermined period of time, a high level abnormal approach signal NS is output from the ANDr-) 410. When detected, a warning lamp is turned on 9 and the recording operation is stopped to avoid recording errors.

However, in conventional optical information recording devices that have such an abnormal approach detection means, even if abnormal approach occurs due to an accidental impact, it is necessary to stop the recording operation and recover manually. was there.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned conventional problems,
The purpose is to provide an optical information recording method that provides an automatic error recovery step and allows smooth re-operation.

[Summary of the invention]

In order to achieve the above object, an optical information recording method according to the present invention detects the approach of a light beam for recording and a track on the recording medium adjacent to the light beam, and when the approach occurs, It is characterized by erasing recorded information in a recording area including a nuclear approach point, and re-recording the recorded information in the erased recording area.

[Embodiments of the invention]

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram showing an example of an optical information recording/reproducing device.

In the figure, above a magneto-optical disk 101, which is a recording medium, is an optical head 10 for recording, reproducing, and erasing.
2, and the optical head 102 can be moved in the radial direction of the magneto-optical disk 101 by a motor 103.

On the other hand, an erasing magnet 104 for supplying an auxiliary magnetic field during erasing is provided below the optical disk 101, and the erasing magnet 104 is driven by a motor 105 to
It is movable in the radial direction of 1.

Motors 103 and 105 are controlled by motor drive control circuit 10
6 performs operation control, and motor drive control circuit 10
6 is under the control of the control circuit 1070.

The control circuit 107 inputs image information ID from, for example, an image reading device, and outputs it to the laser modulation circuit 108 . The laser modulation circuit 108 modulates the output light of the laser 109 in the optical head 102 based on the image information ID.

The light from the laser 109 is split into three light beams by a diffraction grating 110, transmitted through a beam splitter 111, reflected by a tracking mirror 112, and further transmitted through an objective lens 113 to form three light beams on the magneto-optical disk 101. Beamsbok) 501A.

501B and 501C are formed.

Beam subbox for tracking control) 501B and 5
The reflected light of 01C passes through the objective lens 113, is reflected by the tracking mirror 112 and the beam sinter 111, and enters the photodetectors 401B and 401C, respectively. Each output signal of the photodetectors 401B and 401C is input to the tracking control circuit 114, and the tracking control circuit 114 generates the tracking signal TS based on the Ryokawa force signal.
is output to the tracking mirror 112. The tracking mirror 112 operates according to the tiger and king signal T8,
The irradiation positions of beam spots 501A, 501B, and 501C are changed.

The tracking control circuit 114 has abnormal approach detection means shown in FIG. 4, and outputs an abnormal approach signal NS to the control circuit 107. The control circuit 107 also connects the switching transistor 40 to the tracking control circuit 114.
Outputs control signals including on/off control of 6.

During reproduction, the reflected light from the main beam spot 501A enters the photodetector 401A,
A converts it into an electrical signal corresponding to the recorded information.

This electrical signal is amplified by an amplifier 115 and output from a signal processing circuit 116 to the outside as a reproduced signal RD.

Further, a counter 117 is connected to the control circuit 107 to count the number of times the abnormal approach signal N8 is generated.

FIG. 2 shows a magneto-optical disk 101 used in the above device.
FIG. The magneto-optical disk 101 has a structure in which a recordable portion is divided into a plurality of areas n.

In an optical information recording device having such a configuration,
An embodiment of the optical information recording method according to the present invention is shown in FIG.
This will be explained using the flowcharts of 4) and (B).

However, here, it is assumed that the recording information I is recorded in area n of the magneto-optical disk 101.

First, the control circuit 107 calculates the count value T of the counter 117.
5TI), the motor 103 is operated via the motor drive control circuit 106, and the main beam
Move 01A to the beginning of area n (8T 2 ).

Next, the motor 103 is operated in the same way, and the optical head 1
02 transmission operation is started (ST3). When the feed speed of the optical head 102 reaches a predetermined speed (ST4
), the control circuit 107 is a radar modulation circuit 108
The recording information I is outputted to the recording information I, and the output light of the laser 109 is modulated in accordance with the recording information ■ (ST5). In this way, recording information I is recorded on the magneto-optical disk 101 by the main beam spot 501A.

During this time, the abnormal approach detection means already mentioned operates constantly.
If an abnormal approach occurs, the abnormal approach signal NS is set to a high level.

The control circuit 107 controls if the recorded information I is not completed (
No in ST6), it is determined whether the abnormal approach signal N8 from the tiger/king control circuit 114 is at a high level (
8T7). If the abnormal approach signal NS is not at a high level (NO in ST7), recording information I is continuously recorded in area n.

In this way, when the recording information l ends without abnormal approach occurring (YES in ST 6), the control circuit 107
The modulation of the optical head 102 is stopped (5T8), and the forwarding of the optical head 102 is also stopped (8T9).

On the other hand, during recording, the main beam spot 501A
When the abnormal approach signal N8 becomes high level (positive of 8T7) due to an abnormal approach to the truck 502 one round before, the control circuit 1
07 stops modulation of radar 109 and interrupts recording (
ST10).

Subsequently, the control circuit 107 causes the motor drive control circuit 106 to operate the motor 105 to move the erasing magnet 104 to the position of area N (STII).

Similarly, the motor 103 is operated to move the main beam subsystem 501A to the beginning of area n (ST
12).

In this state, the control circuit 107 increases the output of the radar 109 to at least the recording output (8T13), and increases the temperature of the portion irradiated by the main beam spot 501A. When this temperature reaches one point, the erasing magnet 1
The recording is erased by the magnetic field of 04. By thus moving the optical head 102, the information in area n is erased (ST14).

When the information in area n is erased, the control path 107 increases the count value T of the counter 117+11. (ST15), and it is determined whether the count value T is greater than or equal to a predetermined value Tmax (ST16). That is, it is determined whether or not the number of times T of abnormal approaches has occurred is greater than or equal to a predetermined value Tmax.

If the number of abnormal approaches T has not reached the predetermined value TIn&T (NO in ST 16), return to ST 2 above.
Recording information ■ is performed again from the beginning of area n (8T2
~5T7).

If no abnormal approach occurs during this re-recording (NO in ST7)
), recording to area n has ended normally (ST
6-8T9).

If abnormal approach occurs during this re-recording (YES in ST 7)
) The area n is erased again and the counter 117 is incremented (ST10 to 5T15), and recording to area n is performed again (ST2 to 5T7).

In this way, until the number of occurrences T of abnormal approaches reaches the predetermined value Tmax, the above steps 5TIO to 8T16 are repeated unless the recording information I is normally recorded in the area n.

When the number of occurrences T of abnormal approaches reaches a predetermined value Tmax (S
yEs of T16), the control circuit 107 stops the recording operation (5T17), and displays an error (ST18).
. As mentioned above, this error display is performed after recording error recovery has been repeated a predetermined number of times T0. Therefore, based on this error display, it can be determined whether the apparatus is installed in an inappropriate location with a lot of vibration or whether the feeding speed of the optical head 102 is abnormal.

In this embodiment, a magneto-optical disk is used as the recording medium, but the present invention is not limited to this, and any medium that can be recorded and erased may be used.

Further, although a permanent magnet is used as the erasing means, the present invention can of course be applied to a method of erasing using only a light beam.

〔Effect of the invention〕

As explained in detail above, in the optical information recording method according to the present invention, when an abnormal approach with a track occurs, the area including the spot is erased and rerecorded. Even if this occurs, normal recording can be performed without substantially stopping the recording operation by performing re-recording.

Further, since an error display is performed after abnormal approaches have occurred a predetermined number of times, accidental disturbances can be excluded from the cause of the error, and error recovery processing can be facilitated.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an example of an optical information recording/reproducing device, Fig. 2 is a plan view of the magneto-optical disk in Fig. 1, and Figs. 3 (6) and (B) are optical information recording according to the present invention. FIG. 4 is a schematic circuit diagram showing an example of a tracking control section having abnormal approach detection means; FIG. 5 is a flowchart showing an example of the method; FIG. FIG. 5(B) is an explanatory diagram of the positional relationship with the beam spot, and FIG. 5(B) is an explanatory diagram of the same positional relationship at the time of abnormal approach. 101... magneto-optical disk, 102... optical head, 104... erasing magnet , 107... control circuit, 1
14...Tracking control circuit, 117...Counter, 501A...Main beams/), 501B. 501C...beam spot. r-1----------------------------
C Figure 3 (B)

Claims (2)

[Claims] (1) In an optical information recording method for recording information by irradiating a light beam onto a recording medium, detecting the approach of the light beam for recording and a track on the recording medium adjacent to the light beam; When the approach occurs, the recorded information in the recording area including the approach point is erased,
An optical information recording method characterized by re-recording recorded information in the erased recording area. (2) When the number of times the light beam and the track approach each other reaches a predetermined number of times for the same recorded information, recording is stopped and an error message is displayed. The optical information recording method according to item 1.