JPS63266654A - Recording method for magneto-optical recording and reproducing device - Google Patents

Abstract

PURPOSE:To enable an overwrite without necessitating erase operation by deciding the information recording method of a sector by reading the sector information, recorded in a data control area, and executing the switching of an external impressing magnetic field and ON/OFF of the delay of a record data pulse, correspondingly to the information of the data control area. CONSTITUTION:By deciding the information recording method of the sectors 52, 53, by means of reading the information of the sectors 52, 53, recorded in the data control area 35, existing on a magneto-optical recording medium, and by executing the switching of the external impressing magnetic field and the ON/OFF of the delay of the record data pulse, correspondingly to the information of the data control area 35, the overwrite can be executed without necessitating the erase operation. However, one sector, at least, of every track of the data control area is qualified to carry the record of the sector information of the participant track. Thus, the information can be recorded at a real time by using only one optical pickup, without necessitating the erase operation.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention focuses light such as a laser into a minute spot,
The present invention relates to a recording method of an apparatus for recording and reproducing information at high density by irradiating a magneto-optical recording medium.

[Conventional technology]

A schematic diagram of a conventional magneto-optical recording method is shown in FIG. Fifth
In the figure, numeral 11 represents a data cell in which 1-bit data is recorded, and its period is T. Reference numeral 12 indicates the direction of magnetization of the magneto-optical recording medium, which is currently magnetized downward as an initial state. At this time, it is assumed that O is recorded as all data. 13 represents the laser output waveform when recording information. The higher side of this waveform is the recording power, and the lower side is the reproduction power. 1
When the magneto-optical recording medium in state 2 is irradiated with a laser beam shown by 13 and at the same time an external magnetic field is applied in the direction shown by arrow 13, the area irradiated with the recording power as shown in 14. Only when the direction of magnetization is reversed, information is recorded.

15 is a reproduced waveform when the magneto-optical recording medium in the state 14 is reproduced, and the portion where magnetization reversal exists in the data cell is designated as 1. In this case, 1101 is recorded. If you try to record new information at this location, 1
By reversing the direction of the externally applied magnetic field and applying DC erasing power as shown in 6, the initial state of deafness shown in 12 is restored, and new information can be recorded by performing the operation in 13 again.

[Problem that the invention seeks to solve]

In this way, in the conventional magneto-optical recording/reproducing faH,
When newly recording information, the previously recorded information must be erased and then recording must be performed, which requires an extra operation of erasing. In other words, overwriting, which is done on magnetic disks, is not possible. As a means of solving this problem, a configuration has been developed that allows overwriting by using two optical pickups, one for recording only and the other for erasing.Also, the externally applied magnetic field can be modulated at high speed. However, a method has been proposed in which overwriting is possible by continuing to irradiate laser light during that time. However, since these conventional techniques require two optical pickups, the configuration becomes complicated and the number of parts increases, leading to an increase in cost. In addition, the high-speed modulation method of the magnetic field has a limitation in that it cannot record at high frequencies, which poses a practical problem.

Therefore, the present invention is intended to solve these problems, and its purpose is to provide a recording method that allows overwriting in real time using a single optical pickup that has been conventionally used. There is a particular thing.

(Means for Solving the Problems) The recording method of the magneto-optical recording and reproducing device of the present invention is a method for recording and reproducing information in a magneto-optical recording and reproducing device that focuses a laser beam into a minute diameter to record and reproduce information on a magneto-optical recording medium. In the recording method, by reading sector information recorded in a data management area existing on the magneto-optical recording medium, determining the information recording method of the sector, and corresponding to the information in the data management area, A feature is that overwriting can be performed without requiring an erasing operation by switching the externally applied magnetic field and turning on/off the delay of the recording data pulse.

However, it is assumed that at least one sector of each track in the data management area records sector information of that track.

[Effect]

According to the above recording method of the present invention, sector information of a data management area provided on a magneto-optical recording medium is read,
After determining whether or not to delay the direction of the externally applied magnetic field and the clock of recorded data based on this value, by recording to satisfy these conditions, it is possible to eliminate the need for erasing operation with only one optical pickup. It becomes possible to record information in real time.

〔Example〕

Hereinafter, the present invention will be explained in detail based on the drawings.

A schematic diagram of the magneto-optical recording method of the present invention is shown in FIG. 1st
In the figure, 21 represents a data cell in which 1-bit data is recorded, and its period is T. Reference numeral 22 indicates the direction of magnetization of the magneto-optical recording medium, which is currently magnetized upward in the initial state of deafness. At this time, it is assumed that all 0s are recorded as data. 23 represents a laser output waveform when recording information. The higher side of this waveform will be called the recording power, and the lower side will be called the reproduction power. Note that the falling edge of the recording pulse is always set to -t at the starting point of the data cell as shown in the figure, and the pulse width is made shorter than T/2. When the magneto-optical recording medium in the state 22 is irradiated with the laser beam shown at 23 and at the same time an external magnetic field is applied in the direction shown by the arrow 23, the recording power is irradiated as shown at 24. The direction of magnetization is reversed only in that portion, and information is recorded. 25 is a reproduced waveform when a magneto-optical recording medium having a color like 24 is reproduced, and a portion where magnetization reversal exists in a data cell is designated as 1. In this case, 1101 is recorded.

Next, when making an overlap at this same location, the direction of the externally applied magnetic field is reversed as shown at 2B, and a recording waveform with a falling pulse at the center of the data cell is irradiated, as shown at 27. A magnetization pattern is formed. At this time, 24 magnetization patterns are completely erased. In other words, the recording state indicated by 24 is erased, and the recording state indicated by 24 is erased.
This means that it has been recorded in the state shown in 7. 28 is 2
This is the reproduced waveform when a magneto-optical recording medium in state 7 is reproduced, and the part where magnetization reversal exists in the data cell is
This means that 1011 was recorded. When overwriting further, by performing process 23,
New information can be recorded. In this way, when the recording method of the present invention is used, the erasing operation required in conventional magneto-optical recording becomes unnecessary, and recording can be performed in real time.

FIG. 2 shows a schematic diagram of the format of the magneto-optical recording medium used in the present invention. 31 is a preformat part in which track addresses, sector addresses, etc. are formed in advance on the magneto-optical recording medium using uneven bits; 32 is a part for switching the externally applied magnetic field and turning on/off the delay of the recording number reproduction data pulse. The gap 33 is a user data area where user data is recorded. 34 indicates a sector division in a part of the buffer.

35 indicates a data management area on the magneto-optical recording medium. This part records the information recording method for each sector.

One track is formed by a plurality of sectors clustered together.

FIG. 3 is a flowchart during recording and reproduction according to the present invention. When recording, the data management area 35 is read at 40 to learn the configuration of the file to be recorded and the corresponding sector recording method. Next, read the preformat section 31 in FIG. 2, determine whether it is the target address at 41, and if it is at the correct address position, set the polarity at 42 according to the information in the data management area read earlier. When the previous recording state is in state 24 in FIG. 1, the clock is delayed in step 43 so that the falling edge of the recording pulse is at the center of the data cell, and the direction of the externally applied magnetic field is adjusted in step 44. Switch. In state 27, the clock is not delayed and only the polarity of the magnetic field is switched. This is done between the gear parts 330, and then the data is recorded in the user area 33 at 45. When recording of one file is completed, the sector information in the data management area is finally rewritten. During reproduction, the polarity of the external magnetic field is not switched, and only the clock delay 43 is performed according to the contents of the sector information.In this way, data can be recorded and reproduced without an erasing operation.

4 is a schematic diagram showing the structure of the data management area of the present invention. When recording information on the Nth track of the data management area, first read the flag section 51 to confirm the recording method of each sector (sector 52, sector 53, etc.) of this track, and then follow this information. Recording is performed while switching the externally applied magnetic field and turning on and off the delay of the recording data pulse. Next, only the flag portion is erased and new flag information is recorded. When reading information, only the data pulse delay is turned on and off according to flag information and the information is read. However, as the flag information recording method, one of the predetermined recording methods shown in FIG. 1 is used.

〔Effect of the invention〕

As described above, according to the present invention, overwriting can be performed on a magneto-optical recording medium using only one optical pickup.
The structure is the same as that used conventionally and is simple, and the number of parts is reduced, leading to cost reductions. Also,
Unlike the magnetic field modulation method, it uses a laser modulation method, so it has the advantage of being able to record at a high frequency and easily record at a high transfer rate.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of the magneto-optical recording method of the present invention, FIG. 2 is a schematic diagram of the format of the present invention, FIG. 3 is a flow chart of recording and reproducing of the present invention, and FIG. FIG. 5, a schematic diagram of a management area, is a schematic diagram of a conventional magneto-optical recording method. 11...Data cell 12...Magnetization state 13...
・Recording waveform 14... Magnetized port 15... Reproducing waveform 16... Erasing waveform 21... Data cell
22... Magnetization state 23... Recording waveform 24...
・Magnetization state 25...Reproduction waveform 26...Recording waveform 27...Magnetization state B 28...Reproduction waveform 31
... Preformat section 32 ... Gap section 1 33 ... User area 34 ... Buffer part 35 ... Data management area 40 ... Sector information reading 41 ... Address determination 42 ... Polarity setting 43...Clock delay 44...External magnetic field polarity switching 45...Record/playback 46...Rewriting sector information 51...Flag section 52.53...Part or more of the sector Applicant Seiko Epson Corporation Representative Patent Attorney Tsutomu Mogami and 1 other person 24+ 10
Eyes + +++ + ÷27 + ↓
↑ Thousand Thousand + + + t+1
0 Ding 1 Akira 1) Koji 20 'JIJB Zukatsu 4 Ward

Claims (2)

[Claims] (1) In a recording method of a magneto-optical recording and reproducing device that records and reproduces information on a magneto-optical recording medium by narrowing a laser beam to a minute diameter, information is recorded in a data management area on the magneto-optical recording medium. The information recording method of the sector is determined by reading the sector information in the sector, and the data is erased by switching the externally applied magnetic field and turning on/off the delay of the recording data pulse in accordance with the information in the data management area. A recording method for a magneto-optical recording/reproducing device, which is characterized in that overwriting can be performed without requiring any operation. (2) A recording method for a magneto-optical recording/reproducing apparatus according to claim 1, wherein at least one sector of each track in the data management area records sector information of that track. .