JPH02267731A - Rewritable type optical medium recorder - Google Patents

Abstract

PURPOSE:To prevent malfunctions such as a miserasing, a non-recording by discriminating whether or not respective heads for erasing and recording are in a correct position relation, moving both or either of the heads when the relation is incorrect, and executing a recording again. CONSTITUTION:An erasing/reproducing head 3 and a recording/reproducing head 4 are made into a recording mode, and heads are shifted to starting positions. The timing is obtained so that a part erased by the head 3 can be recorded by the head 4 after the half rotation of a disk 1. After the recording is started, the position correction instructing part 110 of a controller 51 allows the discriminating part 120 of a CPU 52 to confirm the head positions. The discriminating part 120 allows ID detecting parts 130a and 130b of slave CPUs 53a and 53b to read an ID. The detection result is compared with a relation specified beforehand at the discriminating part 120, and the head positions are decided. When the positions are incorrect, the instructing part 110 stops the action, the movements of both or either of the heads are instructed through the CPU 52 to the CPUs 53a and 53b, and the normal position relation is maintained. By such a constitution, the malfunction is prevented.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an optical medium recording device in which recorded information can be erased and rewritten, and particularly relates to preventing accidental erasure during writing operations. .

[Prior Art] In recent years, various optical media on which information is written using light (for example, magneto-optical disks, optical disks, optical cards, magneto-optical cards, etc.) have been developed.
Erasable type devices have been developed in which recorded information can be erased and rewritten. Hereinafter, a rewritable magneto-optical disk recording device will be described as a typical conventionally known recording device using this type of rewritable optical medium.

FIG. 4 shows an example of the configuration of a conventional device of this type. The configuration of this device is disclosed in Japanese Patent Application No. 61251129.

First, an outline of the structure of a rewritable magneto-optical disk recording head, generally indicated by reference numeral 40, will be described.

A rewritable magneto-optical disk 1 (medium) mounted on a recording device 40 is rotated by a spindle motor 2. Opposed to each other across the center of rotation is a magneto-optical head for erasing/reproducing (erasing head) 3. A recording/reproducing magneto-optical head (recording head) 4 is arranged. Here, the function of the head 3 (4) is selectively switched to either a reproduction mode or an erasure (recording) mode by a command from a control system, which will be described later. In addition, these heads 3
．． 4 are mounted on the sliders 7 and 8, respectively, and the slide rail 1 is driven by the slider drive magnets 9 and 10.
1 and 12 in the radial direction of the disk 1.

On the other hand, an erasing bias magnet 5. Although the recording bias magnets 6 are provided to face each other, the directions of the magnetic fields of these bias magnets 56 are opposite to each other.

In this recording device 40, in order to obtain a high transfer rate, the recording area of the disc 1 is divided into an outer circumferential area and an inner circumferential area for recording. That is, the outer half of the recording area of the disk 1 is used as the outer magneto-optical head 3a.
, 4a, and the inner half is used as an area for the inner circumferential optical heads 3b and 4b. During recording, the recording signal is sent to the outer magneto-optical head 4 according to commands from the control system.
Recording is performed by distributing it to a and an inner magneto-optical head 4b,
During reproduction, the signal from the outer magneto-optical head 3a (or 4a) and the signal from the inner magneto-optical head 3b (or 4b) are combined to produce a reproduction signal.

Next, the more detailed operation of the magneto-optical disk recording device 40 configured as described above will be described together with the control system.

FIG. 5 shows a schematic block configuration of the control system of the recording apparatus 40. As shown in FIG.

In the control system 50 shown in the figure, the slave CPU 53
The slave CPU 53b controls the magneto-optical head 4 for recording/reproduction and the slider 8. These slave CPs
Management of U53a, 53b and control of motor 2 are performed by mask C.
This is performed by the PU52. In addition, this master CPU 52
The system controller 51 manages the entire system, including the management of external input/output and position management of the head 3.4.
This is done by

In the recording device 40 controlled by the control system 50 configured as described above, erasing operations and recording operations are performed in parallel. That is, prior to rewriting on the disc 1, the records already written at the location to be rewritten are erased. It is done as follows.

When starting recording on the disk 1, the magneto-optical head 3 for erasing/reproducing is set in the erase mode and the magneto-optical head 4 for recording/reproducing is set in the recording mode and moved to a position where recording is to be started. The heads 3 and 4 positioned in this manner are controlled to follow the rotational position of the rotating disk 1.

Now, to record on disk 1, first head 3 (
In the erasing mode), a strong light beam spot is projected onto a portion of the groove of the disk 1 where new recording is to be performed (temporarily referred to as A), and the perpendicular magnetization film in that portion is magnetized in the downward erasing direction. This erases the records that have already been written.

When the rotational position of the erased portion A rotates approximately half a turn and reaches the position of the head 4 (recording mode), the head 4 projects a light beam spot modulated according to the recorded information onto the portion A. do. At this time, the magnetization of the perpendicular magnetization film is reversed upward only when the recorded information is "1" due to the upward bias magnetic field, and new writing is performed.

As described above, for the same location on the disk 1, the head 3
By timing the recording operation of the head 4 (recording mode) to follow the erasing operation (erasing mode), the erasing/recording operation is performed in parallel.

On the other hand, when reproducing a recording, the head 3 (or 4) is switched to the reproduction mode and used as a reproduction head. That is, the head 3 (or 4) projects a weak light beam spot onto the disk 1 and reads the recorded information by reading the deflection direction of the reflected light.

A series of these erasing/recording and reproducing operations are performed by the control system 50.
Commands are sent from the system controller 51 to the master CPU 52, and further from the master CPU 52 to the slave CPUs 53a and 53b for execution.

[Problems to be Solved by the Invention] In the above-described conventional magneto-optical disk device 40, when the erasing operation of the head 3 (erasing mode) is followed by the recording operation of the head 4 (recording mode), the timing is may deviate from the predetermined timing. This may occur, for example, because one of the components of the control system 50 takes time to perform another processing task, resulting in a delay in issuing a command to the head 3.4.

Conventionally, when the timing of the follow-up operation is off in this manner, the recorded portion of the disk 1 recorded by the head 4 (recording mode) may be erased by the head 3 (erasing mode) after half a rotation. This is the same as simply performing an erasing operation, and this results in the inconvenience that what should have been recorded is not actually recorded.

The present invention has been made in view of the above problems, and its purpose is to provide a rewritable optical medium recording device that can always perform correct recording operations.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a recording head for writing information with light onto a rotating medium, and an erasing head for erasing the information with respect to the center of rotation of the medium. In an optical medium recording device arranged to face each other and capable of rewriting the information written on the same location on the medium, when the recording head performs a writing operation following an erasing operation by the erasing head. a positional relationship detecting means for detecting positional information of both heads on the medium and detecting an actual positional relationship of both heads based on the detected positional information; a position of both heads whose detected positional relationship is predetermined; a determining means for determining whether or not the relationship matches; if the result of the determination is a match, the erasing and writing operations are continued; if the results are not consistent, both heads or one of the heads is moved so as to make a match; and a control means for controlling.

Here, the medium has a spiral recording track on which sector numbers are recorded that increase from the inner circumference toward the outer circumference as shown in FIG. In this case, the predetermined positional relationship between both heads of the discriminating means is such that the sector number corresponding to the erasing head position is the recording head. Suppose that it is a dog than the sector number corresponding to the head position.

Alternatively, the medium has a plurality of recording tracks in which track numbers are recorded in an array concentrically with respect to the center of rotation as shown in FIG. 3(b) and increasing from the inner track to the outer track. , in each of these tracks, sector numbers are recorded that increase in the same direction, and both heads move over time from the sector number low to the dog, and from the track number low to the dog. In this case, assuming a virtual number in which the track number is the upper digit and the sector number is the lower digit, the predetermined positional relationship between both heads of the discriminating means is determined by the erasing head position. It is assumed that the virtual number corresponding to the recording head position is smaller than the virtual number corresponding to the recording head position.

[Function] In the rewritable optical medium recording device according to the present invention configured as described above, the actual positional relationship between the erasing head and the recording head on the medium is detected by the positional relationship detection means. . Then, the determining means determines whether the detected positional relationship matches a predetermined positional relationship, that is, a positional relationship such that the portion erased by the erasing head is recorded by the recording head after half a rotation of the medium. It is determined by

Here, if the determination result is a match, the control means continues the erase operation and write operation.

On the other hand, if the determination result is a non-coincidence, the control means moves both heads or one of the heads so that the above-mentioned coincidence occurs.

Therefore, since the erasing head and the recording head are maintained in a correct positional relationship, correct recording operation can be performed.

In addition, the above predetermined positional relationship (correct positional relationship)
is determined by the shape of the recording track of the medium, etc., as shown in the following positional relationships (1) and (2).

For example, a medium has a spiral track as shown in FIG. Or, if the sector number moves from the lowest sector number to the highest sector number over time,
If the relationship between the sector number X corresponding to the erasing head position and the sector number Y corresponding to the recording head position satisfies x>y...(1), then the erasing head and recording head are correct. It's a positional relationship. In this case, the positional relationship detecting means detects the sector number as an ID without indicating the positions of both heads on the medium, and determines the positional relationship between both heads based on this.

Furthermore, the medium has concentric tracks as shown in FIG. If a number (No. 1 to 8 in the illustrated example) is recorded and both heads move over time from the lowest sector number to the highest and from the lowest track number to the highest track number, each head A new ID is assumed in which the track number corresponding to the position is the upper digit and the sector number is the lower digit. Here, if the following relationship is satisfied: ID of the erasing head>ID of the recording head (2), the erasing head and the recording head are in a correct positional relationship. In this case, the positional relationship detecting means detects the sector number and track number corresponding to the positions of both heads on the medium to determine the new ID, and based on this, determines the positional relationship between the two heads.

In order to further clarify the features and advantages of the present invention, preferred embodiments will be described below with reference to the accompanying drawings.

Embodiment FIG. 1 shows a schematic block configuration of a control system of a rewritable magneto-optical disk recording apparatus according to embodiments of the present invention. The control system 100 shown in FIG. 1 includes each element 110, 120, 130a, 1
The control system 50 is the same as the conventional control system 50 except that the control system 30b is added. Each of these added elements 110, 120, 13
0a.

130b are the system controllers 51. Master CP
U52. Slave CPU53a, slave CPU53b
is given by programming. Note that the structure of the mechanism of the magneto-optical disk recording device according to the present invention is the same as that of the conventional magneto-optical disk recording device 40, so illustration thereof is omitted.

FIG. 2 shows a sequence of recording operations by the control system 100 of the magneto-optical disk recording apparatus according to the present invention. The recording operation will be explained below along this sequence.

At the start of operation (STI), first the magneto-optical head 3 for erasure/reproduction is set to the erase mode, and the magneto-optical head 4 for recording/reproduction is set to the erase mode.
5T2), these heads 3.4
to the position on disk 1 to start recording (S
r3). Next, the head 3 of the magneto-optical disk 1 (medium)
The timing is set so that when the part erased by (erase mode) rotates half a turn, the head 4 (recording mode) records (Sr1), and these heads 3.4 follow (Sr5) to perform erasing and recording. Start (Sr6)
The process up to Sr6 is the same as the conventional one.

Record 15F! The beginning? &, fli (position correction command unit (control means) 11 of the system controller 51 of the J section system 40
0 sends a command to the determining unit (discriminating means) 120 of the master CPU 52 to confirm whether the positions of the head 3 (erasing mode) and the head 4 (recording mode) are correct. Based on this confirmation command, the determination unit 120 determines whether the slave CPU 53a
, 53b ID detection unit (positional relationship detection means) 130a,
An ID reading command is given to each of 130b. Here, the ID detection units 130a and 130b read the ID indicating the position of the head 3.4 on the disk 1, and provide the detection result to the discrimination unit 120 of the mask CPU 52. Next, the determining unit 120 compares the detected IDs of the ID detecting units 130a and 130b with a predetermined relationship.
It is determined whether the position of 4 is correct (Sr1).

Note that the ID to be detected and the example of the predetermined relationship are as described in the section of the effect.

The determination result of the determination unit 20 is sent to the position correction command unit 11 of the system controller 51 as a response to the confirmation command.
given to 0. Here, if the response indicates that the heads 3.4 are in a normal positional relationship, the position correction command section 110 continues the erasing and recording operations.

On the other hand, if the response indicates that the heads 3.4 are not in the normal positional relationship, the position correction command unit 110 stops the erasing and recording operations and issues a command to move both or one of the heads 3.4. Slave CPU through mask CPU52
53a and 53b (Sr1). Below, head 3.
Erroneous erasure can be prevented by repeating the same procedure as Sr3 to ST7 until Sr4 is in the correct positional relationship.

In the above embodiment, the determination unit 120 is operated by the master CPU 5.
Although the configuration is such that the determination unit 120 is added to the system controller 51 in place of this configuration, the same effects as in the above embodiment can be achieved.

Further, in the above embodiment, a device for a rewritable magneto-optical disk was shown as a rewritable optical medium recording device, but the present invention is not limited to this. Even when the present invention is applied to devices for other rewritable optical media (eg, optical disks, optical cards, magneto-optical carts, etc.), the same effects as in the above embodiments can be obtained.

[Effects of the Invention] As explained above, according to the rewritable optical medium recording device of the present invention, it is possible to determine whether or not the actual positional relationship between the erasing and recording heads is correct; If the heads are not in the correct positional relationship, one or both of the heads may be moved to allow the recording operation to be performed again.

Therefore, erroneous erasure can be prevented, and malfunctions such as what should have been recorded are not actually recorded can be prevented.

[Brief explanation of drawings]

FIG. 1 is a schematic block diagram showing a control system of an erasable type magneto-optical disk recording device according to an embodiment of the present invention;
Figure 2 is a flowchart showing the sequence of the recording operation of the control system in the previous figure, Figures 3 (a) and (b) are diagrams showing the shape of the recording track, and Figure 4 is an erasable type magneto-optical disk recording. FIG. 5 is a schematic block diagram showing the conventional control system of the device shown in the previous figure. 4...Magneto-optical head 40 for recording/reproduction...
... Rewritable magneto-optical disk device (rewritable optical medium recording device) 100 ... Control system 110 ... Position correction command section (control means) 120 ...
... Discrimination section (discrimination means) 130a, 130b ... ID detection section (positional relationship detection means) Agent Patent attorney Masatoshi Sato [Explanation of symbols of main parts] 1 ... Rewritable magneto-optical Disk (medium) 3.
...Erasing/reproducing magneto-optical head 30a 30b continues operation■ Fig. 5 Whistle 4

Claims (3)

[Claims] (1) A recording head that writes information with light onto a rotating medium and an erasing head that erases the information are arranged to face each other with respect to the center of rotation of the medium, and the information written on the same location on the medium is arranged such that they face each other with respect to the rotation center of the medium. In an optical medium recording device in which information is rewritable, when the recording head performs a writing operation following an erasing operation by the erasing head, position information of both heads on the medium is detected, and the detection is performed. Positional relationship detection means for detecting the actual positional relationship between both heads based on positional information; Discrimination means for determining whether the detected positional relationship matches a predetermined positional relationship between both heads; A rewritable optical medium characterized by comprising: control means for continuing the erasing and writing operations if the results match, and for moving both heads or one of the heads so that a match occurs if the results do not match. Recording device. (2) The medium has a spiral recording track on which sector numbers are recorded that increase from the inner circumference to the outer circumference, and both heads move along the track from the small sector number to the large sector number. If the head is configured to move with time, the predetermined positional relationship between the two heads of the discriminating means is
2. The rewritable optical medium recording device according to claim 1, wherein the sector number corresponding to the erasing head position is larger than the sector number corresponding to the recording head position. (3) The medium has a plurality of recording tracks concentrically with respect to the center of rotation, in which track numbers are recorded in an array that increases from the inner track to the outer track, and each of the tracks has the same number. In the case where sector numbers are recorded in an array that increases in the direction, and both heads move over time from the small sector number to the large track number and from the small track number to the large track number,
Assuming a virtual number in which the track number is the upper digit and the sector number is the lower digit, the predetermined positional relationship between both heads of the discriminating means is:
2. The rewritable optical medium recording device according to claim 1, wherein the virtual number corresponding to the erasing head position is larger than the virtual number corresponding to the recording head position.