JP2844652B2 - Optical media recording device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical medium recording device capable of erasing and rewriting recorded information, and more particularly to preventing erroneous erasure during a writing operation. .

[Related Art] In recent years, in various optical media (for example, a magneto-optical disk, an optical disk, an optical card, a magneto-optical card, etc.) for writing information by light, a rewritable type (Erasable type) capable of erasing / rewriting recorded information. Things are being developed. Hereinafter, a rewritable magneto-optical disk recording apparatus will be described as a conventionally known typical recording apparatus using this type of rewritable optical medium.

FIG. 4 shows an example of the configuration of a conventional device of this type. This apparatus configuration is disclosed in Japanese Patent Application No. 61-251129.

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

The rewritable magneto-optical disk 1 (medium) mounted on the recording device 40 is rotated by the spindle motor 2.
An erasing / reproducing magneto-optical head (erasing head) 3 and a recording / reproducing magneto-optical head (recording head) 4 are arranged at positions facing each other with the rotation center interposed therebetween. Here, the function of the head 3 (4) is selectively switched to one of a reproducing mode and an erasing (recording) mode in accordance with a command of a control system described later. The heads 3 and 4 are mounted on head sliders 7 and 8, respectively, and are moved in the radial direction of the disk 1 along the slide rails 11 and 12 by driving the slider drive magnets 9 and 10. .

On the other hand, the erasing bias magnet 5 and the recording bias magnet 6 are provided so as to face each other with the rotation center of the disk 1 interposed therebetween. However, these bias magnets 5 and 6 have opposite magnetic field directions. I have.

In the recording device 40, the recording area of the disk 1 is divided into an outer peripheral area and an inner peripheral area for recording in order to obtain a high transfer rate. That is, the outer half of the recording area of the disk 1 is an area for the outer magneto-optical heads 3a and 4a, and the inner half is an area for the inner magneto-optical heads 3b and 4b. At the time of recording, the recording signal is transmitted by the control system command to the outer magneto-optical head 4a and the inner magneto-optical head 4b.
During recording, the signal from the outer magneto-optical head 3a (or 4a) and the inner magneto-optical head 3b are read.
(Or 4b) is combined into a reproduced signal.

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

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

In the control system 50 shown in the figure, the slave CPU 53a controls the erasing / reproducing magneto-optical head 3 and the slider 7, and the slave CPU 53b controls the recording / reproducing magneto-optical head 4 and the slider 8. The management of the slave CPUs 53a and 53b and the control of the motor 2 are performed by the master CPU 52. The system controller 51 manages the entire system such as the management of the master CPU 52, the input / output to the outside, and the position management of the heads 3 and 4.

In the recording device 40 controlled by the control system 50 configured as described above, the erasing operation and the recording operation are performed in parallel. That is, prior to rewriting to the disk 1, the recording already written at the place where rewriting should be performed is erased. It is performed as follows.

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

Now, in order to perform recording on the disk 1, first, the head 3
In the (erase mode), a strong light beam spot is projected onto a portion of the groove of the disk 1 where the new recording is to be performed (assumed to be A), and the perpendicular magnetization film in that portion is magnetized by the downward erasing method. Thereby, the already written record is erased.

When the rotational position of the portion A where the recording and erasure is performed is substantially half-turned to reach the position of the bed 4 (recording mode), the head 4 projects a light beam spot modulated according to the recording information onto the portion A. I do. At this time, the magnetization of the perpendicular magnetization film is inverted upward only when the recording information is “1” by the upward bias magnetic field, and new writing is performed.

As described above, the erasure recording operation is performed such that the recording operation of the head 4 (recording mode) is performed on the same portion of the disk 1 following the erasing operation of the head 3 (erasing mode). It is done in parallel.

On the other hand, when recording is reproduced, the head 3 (or 4)
Is switched to the playback mode and used as a playback head.
That is, the head 3 (or 4) reads a recorded information by projecting a weak light beam spot on the disk 1 and reading the deflection direction of the inverted light.

A series of operations for erasure recording and reproduction are performed by the control system 50.
A command from the system controller 51 to the master CPU 52, and further from the master CPU 52 to the slave CPU 53a and the slave CPU 53b are sent and executed.

[Problem to be Solved by the Invention] In the above-described conventional magneto-optical disk device 40, when the operation moves to the recording operation of the head 4 (recording mode) following the erasing operation of the head 3 (erasing mode), May deviate from a predetermined timing. This occurs, for example, because one of the components of the control system 50 takes time for another processing operation, and a command to the heads 3 and 4 is delayed.

Conventionally, if the timing of the following operation is shifted in this way, the recording 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 the erasing operation, and there is a disadvantage that what should have been recorded is not actually recorded.

The present invention has been made in view of such a problem, and an object of the present invention is to provide a rewritable optical medium recording apparatus that can always perform a correct recording operation.

Means for Solving the Problems In order to achieve the above object, the present invention provides a recording head for writing information on a rotating medium by light and an erasing head for erasing the information with respect to the center of rotation of the medium. In an optical medium recording device which is arranged so as to be opposed to and in which the information to be written to the same location on the medium is rewritable; when performing a writing operation by the recording head following an erasing operation by the erasing head To
Positional relationship detecting means for detecting positional information of the two heads on the medium and detecting an actual positional relationship between the two heads based on the detected positional information; and a positional relationship between the two heads whose detected positional relationship is predetermined. Discriminating means for discriminating whether or not they coincide with each other; if the discrimination results are coincident, the erasing operation and the writing operation are continued; if not, control is performed to move both heads or one of the heads so that they coincide. Means.

Here, the medium has a spiral recording track in which sector numbers of an array which increase from the inner circumference to the outer circumference as shown in FIG. When the head is moved from time to time along the track from time to time, the predetermined positional relationship between the two heads by the discriminating means is that the sector number corresponding to the erase head position is It is assumed that it is larger than the sector number corresponding to the head position.

Alternatively, the medium has a plurality of recording tracks on which the track numbers are arranged concentrically with respect to the center of rotation from the inner track to the outer track as shown in FIG. 3 (b), In each of the tracks, a sector number of an array that increases in the same direction is recorded, and the two heads move with time from the sector number to the large number and from the small to large track number. Assuming a virtual number with the track number being the upper digit and the sector number being the lower digit, the predetermined positional relationship between the two heads of the discriminating means is set to the erase head position. It is assumed that the corresponding temporary number is larger than the temporary number corresponding to the recording head position.

The present invention also provides a light beam irradiating means for irradiating a medium with a first beam and a second beam; and a position detecting means for detecting a positional relationship between the first light beam and the second light beam. Control means for moving the positions of the two light beams or one of the light beams if the positional relationship does not match a predetermined positional relationship based on a result of detection by the position detecting device; It is provided with.

Preferably, the first light beam is a recording light beam for writing information on a medium, and the second light beam is an erasing light beam for erasing information written on the medium. Good.

[Operation] In the rewritable optical medium recording apparatus 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 detecting means. Then, it is determined whether or not the detected positional relationship is a predetermined positional relationship, that is, whether or not the portion erased by the erasing head matches the positional relationship recorded by the recording head after half rotation of the medium. Is determined.

Here, if the determination results match, the control means continues the erase operation and the write operation.

On the other hand, if the discrimination results do not match, the control means moves both the heads or one of the heads so as to be in the above-mentioned correspondence. Therefore, the correct positional relationship between the erasing head and the recording head is maintained, so that a correct recording operation can be performed.

Note that the predetermined positional relationship (correct positional relationship) is determined by the shape of the recording track of the medium as in the following positional relationships (1) and (2).

For example, the medium has a spiral (spiral) track as shown in FIG. 3 (a), and a series of sector numbers (No. 1 to 21 in the illustrated example) are recorded on the track. When both heads move on the track from the smaller sector number to the larger sector number with time, the relationship between the sector number X corresponding to the erasing head position and the sector number Y corresponding to the recording head position is determined. , X> Y (1), 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 as an ID indicating the position of both heads on the medium,
Based on this, the positional relationship between the two heads is obtained.

Further, the medium has concentric tracks as shown in FIG. 3 (b), and a series of track numbers (t1 to t3 in the illustrated example) for each track and a sector according to the position in each track. If the numbers (Nos. 1 to 8 in the illustrated example) are recorded and both heads move with time from the sector number small to large and from the track number small to large, each head The track number corresponding to the position is the upper digit,
Assume a new ID with the sector number as the lower digit. Here, if the erasing head ID> the ID of the recording head... (2) is satisfied, the erasing head and the recording head are in a correct positional relationship. In this case, the positional relationship detecting means detects a sector number and a track number corresponding to the positions of both heads on the medium, obtains the new ID, and obtains the positional relationship between the two heads based on the new ID.

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 an embodiment of the present invention. The control system 100 shown in FIG.
The control system is the same as the conventional control system 50 except that the elements 110, 120, 130a, and 130b indicated by dotted lines are added. These added elements 110, 120, 130a, and 130b are provided by programming of the system controller 51, the master CPU 52, the slave CPU 53a, and the slave CPU 53b, respectively. The configuration of the mechanical unit 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, and therefore is not shown.

FIG. 2 shows a sequence of a recording operation by the control system 100 of the magneto-optical disk recording apparatus according to the present invention. Hereinafter, the recording operation will be described along this sequence.

To start the operation (ST1), first, the erasing / reproducing magneto-optical head 3 is set to the erasing mode, and the recording / reproducing magneto-optical head 4 is turned on.
Is set to a recording mode (ST2), and the heads 3 and 4 are moved to a position on the disk 1 where recording is started (ST3).
Next, when the portion erased by the head 3 (erasing mode) of the magneto-optical disk 1 (medium) rotates half a turn, the head 4
(ST4), the heads 3 and 4 are made to follow each other (ST4).
5) Start erasing and recording (ST6). Up to ST6, it is the same as the conventional one.

After the start of the recording, the position correction command section (control means) 110 of the system controller 51 of the control system 40 sends the head 3 (erasing mode) and the head 4 (recording mode) to the discriminating section (discriminating means) 120 of the master CPU 52. Send a command to confirm that the position is correct. Based on this confirmation command, the discriminating unit 120 determines the ID detecting units (positional relationship detecting means) 130a, 1 of the slave CPUs 53a, 53b.
An ID read command is given to each of the 30b. Here, the ID detection units 130a and 130b indicate the positions of the heads 3 and 4 on the disk 1.
The ID is read, and the detection result is determined by the determination unit 120 of the master CPU 52.
give. Next, the determination unit 120 detects the detection IDs of the ID detection units 130a and 130b.
By comparing with a predetermined relationship of the head 3,
It is determined whether the position of 4 is correct (ST7).

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

The determination result of the determination unit 120 is given to the position correction command unit 110 of the system controller 51 as a response to the confirmation command. Here, if the response indicates that the heads 3 and 4 are in a normal positional relationship, the position correction command unit
110 continues the erasing and recording operations as they are.

On the other hand, if the response indicates that the heads 3 and 4 are not in a 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 and 4. It is given to the slave CPUs 53a and 53b through the master CPU 52 (ST8). Hereinafter, erroneous erasure is prevented by repeating the same procedure as in ST3 to ST7 until the heads 3 and 4 have a correct positional relationship.

In the above embodiment, the configuration is such that the determination unit 120 is added to the master CPU 52. However, instead of this configuration, the configuration in which the determination unit 120 is added to the system controller 51 has the same effect as the above embodiment. .

Further, in the above-described embodiment, a device for a rewritable magneto-optical disk is shown as a rewritable optical medium recording device, but the present invention is not limited to this. When the present invention is applied to a device for another rewritable optical medium (for example, an optical disk, an optical card, a magneto-optical card, and the like), the same effects as those of the above embodiment can be obtained.

[Effects of the Invention] As described above, according to the rewritable optical medium recording apparatus of the present invention, it is determined whether or not the actual positional relationship between the erasing and recording heads is correct. Is not in the correct positional relationship, both or one of the heads is moved so that the recording operation can be performed again. Therefore, erroneous erasure can be prevented, and erroneous operations such as the fact that what should have been recorded was not actually recorded can be prevented.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram showing a control system of an Erasable type magneto-optical disk recording apparatus according to one embodiment of the present invention, FIG. 2 is a flowchart showing a sequence at the time of a recording operation of the control system of the previous figure, and FIG. 4A and 4B are diagrams showing the shape of a recording track, FIG. 4 is a configuration diagram showing a mechanism of an Erasable type magneto-optical disk recording device, and FIG. 5 is a conventional control system of the device shown in FIG. FIG. 3 is a schematic block diagram showing [Description of Signs of Main Parts] 1... Rewritable magneto-optical disk (medium) 3... Erase / reproducing magneto-optical head 4... Recording / reproducing magneto-optical head 40. (Rewritable optical medium recording device) 100 Control system 110 Position correction command section (control means) 120 Discriminating sections (discriminating means) 130a, 130b ID detecting section (positional relation detecting means)

Claims (5)

(57) [Claims] An optical medium having a recording head for writing information by light on a rotating medium and an erasing head for erasing the information, wherein the information written in the same location on the medium is rewritable. In the recording apparatus, when performing a writing operation by the recording head following an erasing operation by the erasing head, a positional relationship detecting unit that detects a positional relationship between the two heads, and a positional relationship detecting device that determines a positional relationship between the two heads. Discriminating means for judging whether or not the positional relationship of the heads coincides with each other; and, if the discrimination results match, the erasing operation and the writing operation are continued. An optical medium recording apparatus comprising: a control unit for moving a head. 2. The recording medium has a helical recording track on which sector numbers of an array increasing in the same direction are recorded, and the two heads are arranged on the track from the sector number smaller to larger. When the head moves along with time, the predetermined positional relationship between the two heads of the determining means is that the sector number corresponding to the erasing head position is larger than the sector number corresponding to the recording head position. The optical medium recording device according to claim 1, wherein: 3. The recording medium has a plurality of recording tracks formed in concentric circles with respect to a center of rotation, with track numbers of an array increasing in the same radial direction being recorded,
A sector number of an array which increases in the same direction is recorded on each track, and the two heads move with time from the sector number small to large and from the track number small to large. Assuming a virtual number where the track number is a high-order digit and the sector number is a low-order digit, the predetermined positional relationship between the two heads of the discriminating means is determined by the virtual number corresponding to the erase head position. 2. The optical medium recording apparatus according to claim 1, wherein is larger than the virtual number corresponding to the recording head position. 4. A light beam irradiation means for irradiating a medium with a first beam and a second beam, and a position detection means for detecting a positional relationship between the first light beam and the second light beam. If the positional relationship does not match a predetermined positional relationship based on the detection result by the position detecting means, the positions of the two light beams or one of the light beams are moved so as to match. An optical medium recording device, comprising: a control unit. 5. The recording medium according to claim 1, wherein the first light beam is a recording light beam for writing information on a medium, and the second light beam is an erasing light beam for erasing information written on the medium. The optical medium recording apparatus according to claim 4, wherein the optical medium recording apparatus is a beam.