JPH0731838B2 - Information recording device - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to an information recording apparatus.

[Technical background of the invention and its problems]

In recent years, various recording media with high density and large capacity have been developed. It is, for example, an optical disk device that records and reproduces information as an optically readable bit string, or a magnetic recording device that performs recording by magnetically reversing the magnetization on a recording medium having a magnetic layer. An erasable magneto-optical disk device for recording and erasing information by irradiating it with a laser beam and applying a magnetic field and reproducing it by irradiating it with a laser beam.

The former two have already been put to practical use, and the other one is being put to practical use. The case of recording with these devices will be described. The last two devices are
In order to maintain the reliability of the recorded information, at present, the recording medium is first rotated once for writing, and if the writing is properly performed, another rotation is performed, and the written information is read. When the information read at this time is erroneous, it is rewritten to another place by the above method. Therefore, the recording medium is rotated twice, writing and reading are performed once, and if there is an error, the error rate is suppressed by rotating the recording medium twice more for a total of four times.

Unlike the former two devices, the latter another device first erases a predetermined position by rotating the recording medium once when writing (re) writing information. Then another recording medium
It is necessary to rotate and perform recording at the position where the previous erasure has been made, and the minimum recording medium must be rotated twice for one (re) writing.

What has been described above is an extremely inferior operability device in which the recording medium must be rotated several times for one recording although high-speed recording is desired in addition to high-density and large-capacity recording. It will end up.

[Object of the Invention]

The present invention has been made in view of the above disadvantages, and an object of the present invention is to provide an information recording apparatus in which information can be written at high speed and access control can be easily performed.

[Outline of Invention]

The present invention relates to a recording medium composed of an information storage unit including a recording area for recording information and an identification area for identifying the recording area, and an erasing processing function in a recording medium capable of recording, reproducing or erasing. In the information recording apparatus capable of performing the following, the first and second heads having the predetermined processing function are provided, and when the first head is in the identification area,
The second head is positioned so that it is located outside the identification area.
An information recording apparatus is provided in which the first and second heads are arranged so that the first and second heads are arranged.

〔The invention's effect〕

According to the present invention, by providing two heads, reliable information recording can be performed at high speed.

Further, by arranging the relative positions of the two heads so that when the first head is in the identification area, the second head is displaced by a predetermined amount so that the second head is in the recording area. Where a control system is required, it can be realized by the same control system, and since only the control system is required to be controlled, head access control is very easy, and a device with extremely good operability is provided.

Example of Invention

An embodiment of the present invention will be described in detail below with reference to the drawings when applied to a magneto-optical disk device.

FIG. 1 is a schematic configuration diagram showing an optical information recording device using a magneto-optical disk as a recording medium. This device is characterized by having two magneto-optical heads (44) (44) 'for erasing and recording. The magneto-optical disk (41) is rotationally driven by a rotary motor (43) connected to a rotary motor control section (45) so as to have a predetermined speed. (44a) (44'a)
Are magnetic field generating elements, both of which are permanent magnets, and are arranged so that their polarities are opposite to each other. Reference numerals (44b) and (44'b) are optical heads for irradiating the magneto-optical disk (41) with a laser beam and for detecting signals for tracking and focusing control. This optical head (44b) (44'b)
Each is composed of a laser, a photodetector, an optical element and the like.
Further, the magnetic field generating elements (44a) (44'a) and the optical head (44
b) (44'b) are designed to be driven integrally, and are held on the feed motors (46) (46) 'connected by the feed motor control units (45) (45)'. There is. Hereinafter, the magnetic field generating elements (44a) (44'a) and the optical head (44a)
b) (44'b) are combined together and the magneto-optical head (44) (4
4) ′. This magneto-optical head (44) (4
4) 'can be moved to an arbitrary radial position of the magneto-optical disk (41) by the feed motors (46) (46)'.

The optical information recording apparatus in this embodiment has a recording mode and a reproduction mode, and when executing the recording / reproduction mode, a recording / reproduction mode instruction signal, a recording / reproduction sector number, a number of recording / reproduction information bits, a recording Information and the like is transferred from the external system to the magneto-optical disk device controller (48) through the interface (47), and the recording mode controller (49) and the reproduction mode controller are sector-wise composed of a certain number of information bits. Each mode is executed by (50).

FIG. 2 shows a schematic structure of a sector, which is a unit for recording and reproducing information. A synchronization signal (21) for reproducing the address number of the sector and a header for indicating the start position of the address number. (22), sector address of sector (2
3), gear (24), sync signal (25) for reproducing recorded information, header (26) indicating the start position of recorded information,
An information signal (27) consisting of a fixed number of information bits and a control signal (28) indicating whether or not the recorded information is correct. Here, the sync signal (21), header (22), and sector address (23) are pre-formatted in advance when the magneto-optical disk is manufactured, or according to the system specifications before recording the information on the magneto-optical disk. The operation of executing the recording information transferred from the external system which has been formatted by the recording mode control unit according to the recording mode according to the present invention will be described in detail with reference to FIG. When the recording mode instruction signal, the recording information bit and the recording sector are transferred from the external system, the recording mode control section (49) sends the magneto-optical head (44) 'to the radius position of the designated sector and outputs the sector address. Playback is detected. Then, in the magneto-optical head (44) 'which generates a magnetic field in the first erasing direction, the information bit recording area of each designated sector is made uniform in the direction of the magnetic domain by the erasing operation regardless of the presence or absence of information. Align. FIG. 3A is a diagram showing a state before execution of the recording mode on the magneto-optical disk (41) designated by the external system. That is, the number of information bits transferred by the external system is (33a ₁ )
It is assumed that recording to (33ai) is specified. (31a ₁ ) ~
(31ai) is an area in which information about the sector address of the (33a ₁ ) to (33ai) sectors is formatted,
It is composed of the synchronization signal (21), header (22) and sector address (23) shown in FIG. 2, and comprises (31a ₁ ) to (31a
The number of sector addresses is increasing to i). Also (32a
₁ ) to (32ai) are information signal recording areas, which are the gear (24), the synchronizing signal (25), the head (26), and the head (26) shown in FIG.
It consists of an information signal (27) and a control signal (28). Furthermore (32
a ₁ ) (32a ₃ ) ... (32ai _-1 ) In the shaded area, some information bit has already been recorded, and (32a ₂ ) ... (32
No information is recorded in the blank areas in ai). FIG. 3B is a diagram showing the state of the designated recording sector after the erasing operation. (31b ₁ ) to (31bi) and (31a ₁ ) to
_{(31ai), (32b 1)} ~ and _{(32bi) (32a 1) ~} (32ai),
(33b ₁ ) to (33bi) and (33a ₁ ) to (33ai) indicate the same region. That is, the hatched area in FIG. 3A shows a state in which the magnetic domain of the area for recording information is uniformly aligned in a certain direction defined by the system by the erasing operation.

Next, when the sector whose information has been erased by the magneto-optical head (44) 'is rotated by the rotary motor (43) and reaches the position of the magneto-optical head (44) for recording information, the information transferred from the external system is transferred. Are sequentially recorded by the magneto-optical head (44) in an area where magnetic domains are aligned in a certain direction by the erasing operation. FIG. 3 (c) is a diagram showing the state of the designated area sector after the recording operation of this information, and includes (31c ₁ ) to (31ci) and (31c ₁ ).
_{b 1) ~ (31bi),} (32c 1) ~ and _{(32ci) (32b 1) ~} (32
bi), (33c ₁ ) to (33ci) and (33b ₁ ) to (33bi) respectively show the same area, and information bits and the like are newly recorded in (32c ₁ ) to (32ci).

FIG. 4 shows a first magneto-optical head that performs an erasing operation prior to a recording operation when recording information, a second magneto-optical head that records information in the erased area, and a sector on the magneto-optical disk. It is a figure which shows a relative position. Recording here means a series of operations for reproducing the sector address number and detecting a predetermined position to record information. The magneto-optical disk (41) is driven clockwise by the rotary motor so that the angular velocity is constant. Magneto-optical disk (4
1) The upper part is substantially evenly divided from the disk center into even number of sectors (10) per rotation. Each sector (10) is embedded with the sector structure shown in FIG. A sector address number is sequentially assigned to each sector. Access to both the first magneto-optical head (44) 'for erasing information and the second magneto-optical head (44) for recording information is driven in the radial direction of the arrow in the figure. The positional relationship between the two magneto-optical heads (44) '(44) is such that when the first magneto-optical head (44)' for erasing is at the beginning of the sector being accessed, the other magneto-optical head (44) ' The magneto-optical head (44) is arranged so as to be located approximately in the middle of the sector. That is, by arranging in this manner, when one of the magneto-optical heads (44) 'is reproducing the sector address number, that is, when the reproduction mode control section (50) of FIG. The magneto-optical head (44) has already reproduced the sector address number, and the recording mode control section (49) has been operated to perform the recording operation. In other words, two magneto-optical heads (4
4) '(44) detects the sector address number of the sector and the timing of subsequent recording / reproducing / erasing operations is shifted.

By doing this, when recording is performed prior to the recording of the information bit when the recording mode is executed, the recording area is erased regardless of whether the recording is not performed. Not to mention forgetting
It is not necessary to manage on the system side whether or not information has already been recorded in the recording area or whether or not it has been erased, and it is possible to provide an easy-to-use device with easy system management. or,
By providing two sets of magneto-optical heads, the time required to execute the recording mode can be shortened to approximately half, and the access time at the time of reproducing information can be shortened because the magneto-optical heads are located at positions substantially opposite to each other. You can Further, by shifting the timing of detecting the sector address numbers of the two magneto-optical heads, it is possible to easily control where two control systems are required by the same control system.

Further, the above-mentioned magneto-optical disk is substantially evenly divided from the disk center into even number of sectors per rotation, but the two magneto-optical heads shown in FIG. As shown in the figure showing the relative position to the sector, the sector per one rotation on the magneto-optical disk may be equally divided into an odd number. In this case magneto-optical disks (41)
Since the sector embedded above divides the sector per rotation into an odd number, the sector edge is not on the same straight line.
By providing the position of the magneto-optical head (44) 'and the position of the second magneto-optical head (44) substantially facing each other, the same effect as described above can be obtained. The direction indicated by the arrow in the figure indicates the moving direction of the two magneto-optical heads (44) '(44).

[Other Embodiments of the Invention]

In the above embodiment, the movement position setting of the two magneto-optical heads is
It was considered to distinguish the radial division from the center of the magneto-optical disk into even-numbered sectors per rotation (Fig. 4) and odd-numbered sectors (Fig. 5).
The moving positions of the two magneto-optical heads can be set without distinction. In FIG. 6, FIG. 6A shows a sector (12) when the magneto-optical disk (41) is evenly divided into an even number of sectors per rotation, and FIG. 6B shows a sector (12) when it is equally divided into an odd number of sectors. It is a figure which shows the positional relationship of (13) and a magneto-optical head (44) '(44). The positional relationships of the magneto-optical heads (44) 'and (44) in FIGS. 9A and 9B are equal.

This is arranged such that the recording magneto-optical head (44) is offset from the erasing magneto-optical head (44) 'by approximately 1/4 sector. In fact, in the schematic configuration diagram of the sector described in FIG. 2, the areas (21) to (23) in which the information regarding the sector address is embedded correspond to about 200 bits, and the information symbol recording area (24) to (28) corresponds to about 4000 bits, and the effect described in the embodiment of the invention can be sufficiently obtained by shifting 1 sector by 1/4. Furthermore, since the magneto-optical disk (41) equally divided into an even number of sectors and the magneto-optical disk (41) equally divided into an odd number of sectors are compatible,
In addition to the effects described above, it can be handled in correspondence with any magneto-optical disk.

In the above embodiment, the magnetic field generating elements are provided in the optical head in a one-to-one relationship, but they may be provided as shown in FIG. FIG. 7 is a diagram schematically showing a case where a magneto-optical disk is loaded in the optical information recording device. The magneto-optical disk (70) rotates and moves in the direction of the arrow in the figure. The feature here is that the magnetic field generating element integrates the erasing side and the recording side. For example, when the laser beam (77) from the erasing side optical head (72) is reading the information (74a ₁ ) related to the sector address of the sector (76a ₁ ), the other recording side optical head (73) The laser beam (78) records on the information signal recording area (75a ₃ ) of the other sector (76a ₃ ).

That is, when the optical head is reading the information on the sector address of one sector, the other optical head does not read the information on the sector address of the other sector by setting the positional relationship between the two optical heads. The magnetic field generating element is integrated so that magnetic fields having different magnetic field directions can be applied to the positions irradiated with the respective laser beams.

By doing this, in addition to achieving all the above effects,
Only one support member for supporting the two magnetic field generating elements is required, and the device can be made compact.

The sectors of the magneto-optical disk are those which are equally divided in a radial pattern, but may be those which are in a linear pattern.

Further, although the erasable magneto-optical disk device is described in the above embodiment, the present invention is also applicable to an optical disk device for writing information as an optically readable pit train and a magnetic recording device for magnetically writing information. Applicable. In this case, one head is a recording head and the other is a reproducing head. In other words, when it is at the head of the sector accessed by one head (for example, recording head),
The other head (for example, a reproducing head) is arranged so as to be located approximately in the middle of the sector. By monitoring at the same time as recording in this way, in addition to the effect described in the case of the magneto-optical disk device, it is possible to suppress the error rate described in the technical background of the invention and its problems at a high speed. It goes without saying that various modifications are possible without departing from the scope.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an optical information recording apparatus according to the present invention in which a magneto-optical disk is used as a recording medium, and FIG. 2 is a diagram showing a schematic configuration of a sector which is a unit for recording and reproducing information. FIG. 3 is a diagram showing a recording operation according to the present invention, and FIGS. 4 and 5 are diagrams showing relative positions of two magneto-optical heads with respect to a sector evenly divided into even and odd numbers per rotation. FIG. 6 shows another embodiment according to the present invention. FIG. 6 is a diagram showing the relative position of two magneto-optical heads with respect to a sector that is radially equally divided per rotation, and FIG. 7 is a magneto-optical disk as a recording medium. It is the figure which showed typically the other Example apparatus which concerns on this invention.

Claims (1)

[Claims] 1. A recording medium comprising an information recording unit composed of a recording area for recording information and an identification area for recording identification information for identifying the recording area.
In an information recording device capable of performing a reproducing or erasing processing function, first and second heads having at least a reproducing processing function of identification information of the identification area and a recording, reproducing or erasing processing function of information with respect to the recording area. When the first head is in the identification area, the second head
The information recording apparatus, wherein the head is shifted by a predetermined amount so as to be arranged at the position of the recording area.