JPH02195548A - Magneto-optical disk device - Google Patents

Abstract

PURPOSE:To record and detect recording information nearly at the same time by forming a 2nd light spot by going back by a specified space on a recording track where a 1st light spot is formed and detecting the recording information which is magnetically recorded with the 1st light spot for recording based on the returning light. CONSTITUTION:In a magneto-optical disk device in a magnetic field modulation recording system which the 1st light spot SPRW for recording irradiates like pulse, the 2nd light spot SPSB2 is successively formed at a position obtained by going back by the specified space l with reference to the 1st light spot SPRW on the recording track TR in the timing of a reference clock signal SCK. Based on received light output SPPD2 obtained by the returning light from the 2nd light spot SPSB2, the recording information DTMN magnetically recorded on the magneto-optical disk 4 is detected with the 1st light spot SPRW. Thus, the recording information DTREC is recorded and collated nearly at the same time.

Description

[Detailed description of the invention] The present invention will be explained in the following order.

A. Industrial field of application B. Overview of the invention C. Conventional technology Problems to be solved by the invention E. Means for solving the problems (Figs. 1, 5, and 6) F. Effects (Fig. 1) 5 and 6) G Example (G1) First Example (Figs. 1 to 3) (G2) Second Example
Example (Figures 4 and 5) (G3) Third example (
(Figs. 6 and 7) (G4) Other embodiments (Fig. 8) H Effect of the invention It is suitable for application to a magneto-optical disk device capable of recording.

B Summary of the Invention The first invention is a magneto-optical disk device using a magnetic field modulation recording method in which a first light spot for recording is irradiated in a pulsed manner, on a recording track on which the first light spot is formed.
By forming a second light spot after a predetermined interval and detecting the recorded information magnetically recorded by the first light spot based on the returned light, the recorded information can be recorded almost simultaneously with the recording. Can be detected.

A second aspect of the invention is a magneto-optical disk device using a magnetic field modulation recording method in which a first light spot for recording is irradiated in a pulsed manner. By selecting the interval to be approximately an integral multiple of the shortest bit length of recorded information, it is possible to reliably detect recorded information almost simultaneously with recording.

Furthermore, a third invention is a magneto-optical disk device using a magnetic field modulation recording method in which a first light spot for recording is irradiated onto a magneto-optical disk rotating at a constant angular velocity in a pulsed manner. By controlling the spot interval between the first and second optical spots in accordance with the recording track information on which the first optical spot is formed, it is possible to reliably operate the optical disc even when the magneto-optical disk rotates at a constant angular velocity. Recorded information can be detected almost simultaneously with recording.

Furthermore, a fourth invention provides a magneto-optical disk device using a magnetic field modulation recording method in which a first light spot for recording is irradiated in a pulsed manner onto a magneto-optical disk rotating at a constant angular velocity, in which the first light spot is formed. on the trailing side of the recording track.
A plurality of light spots are formed at predetermined intervals, and a plurality of light reception outputs obtained by the returned light are combined according to the recording track information on which the first light spot is formed, and the first light spot generates a magnetic field. By detecting the recorded information, even when the magneto-optical disk rotates at a constant angular velocity, the recorded information can be reliably detected almost simultaneously with recording with a simple configuration.

C. Prior Art Conventionally, in magneto-optical disk devices, the magnetization characteristics of a magneto-optical disk made of a perpendicular magnetization film having perpendicular magnetic anisotropy thicken (change) with the Curie temperature Tc as a boundary, and Desired recording information is magnetically recorded.

That is, the perpendicularly magnetized film of a magneto-optical disk has a magnetization characteristic in which its coercive force H6 rapidly decreases at the cue temperature Tc. By applying a magnetic field and then cooling the magneto-optical disk below the cue temperature T, the magnetization direction of the perpendicularly magnetized film can be oriented in the direction of the external magnetic field.

Based on this magnetization principle, a magneto-optical disk device employing overwrite recording, so-called overridable magnetic field modulation recording, continuously irradiates a light beam and scans a light spot on the magneto-optical disk. A predetermined area on the disk is heated to a temperature equal to or higher than the scratching temperature T6, and a magnetic head is used to apply a variable 1M magnetic field whose scratching property is reversed in accordance with recorded information at the timing of a reference clock signal.

In this way, the area irradiated with the light spot will be -
After the light spot is heated to a temperature higher than T9, it is naturally cooled as the light spot passes through it, and the temperature reaches Tc.
It is oriented in the direction of the applied modulated magnetic field at the following timing:

In this way, even if a magnetization pattern has already been formed on the magneto-optical disk, minute regions (hereinafter referred to as pits) oriented according to the modulating magnetic field are sequentially formed in the scanning locus of the optical spot at the period of the reference clock signal. This allows desired recording information to be overridden on the magneto-optical disk.

D Problems to be Solved by the Invention By the way, in a magneto-optical disk device having such a configuration, a light beam emitted from a single laser light source is transmitted through a grating, for example, into three lights consisting of a 0th-order light and an 11th-order light. A magneto-optical disk device has been proposed in which a beam is shaped to form a light spot for checking recorded information (so-called verification) (Japanese Patent Laid-Open No. 62-252552).

In other words, in such a magneto-optical disk device,
A light beam made up of 0th order light is used to override desired recorded information on the magneto-optical disk, and two light beams made up of 11th order light are placed on the recording track onto which the light beam made up of 0th order light is irradiated. , are placed before and after the light beam made up of the zero-order light by a predetermined interval, and the light beam preceding the light beam made up of the zero-order light forms a light spot for reading the address, and the light beam following the light beam forms a light spot for reading the address. , to form a light spot for verification.

However, like a magneto-optical disk device with such a configuration,
In the case of natural cooling after irradiation with a light beam, the time it takes for the temperature to drop below the Curie temperature Tc after the light spot scans varies depending on the temperature characteristics of the magneto-optical disk itself. There is a problem that the pit formation position changes with respect to the reference clock signal depending on the temperature characteristics of the signal.

Therefore, for example, when a reference clock signal is formed from pre-pits formed on a magneto-optical disk in advance, the formation position of the pits changes with respect to the pre-pits, making it difficult to reproduce recorded information based on the pre-pits (i.e. ,
(A phase shift occurs with respect to the phase of the reproduced signal obtained from the pre-pits.)

Furthermore, in order to reliably detect changes in orientation between adjacent bits and reproduce recorded information, it is necessary to form a magnetization pattern in which the orientation is sharply reversed between adjacent bits.

Therefore, when continuously irradiating a light beam,
By selecting a magnetic head that forms an iF field and a drive circuit that drives the magnetic head, one with excellent frequency characteristics is used. There is a problem in that it is necessary to rapidly reverse the scratchiness of the magnetic field, which complicates the overall configuration.

The present invention has been made in consideration of the above points, and has an overall simple configuration, can form bits at the correct position relative to the timing of the reference clock signal, and can detect recording information at the same time as recording. The purpose of this paper is to propose a magneto-optical disk device that obtains the desired results.

Means for Solving Problem E To solve this problem, in the first invention, first optical spots SP are sequentially placed on the recording track TR of the magneto-optical disk 4 at the timing of a predetermined reference clock signal 5CII. , w, and the reference clock signal SCK
Recorded information DT-! By applying a predetermined modulated magnetic field H9 whose polarity is reversed according to c, recording information DT□ is recorded on the magneto-optical disk 4. In a magneto-optical disk device L, 30.40, which is configured to magnetically record data, recording tracks T are sequentially recorded at the timing of a reference clock signal SCX.
A second light spot sps, 2 is formed at a position a predetermined interval l behind the first light spot SPmw on R, and light reception obtained by return light from the second light spot 5P-si. Output SP. 2, the recorded information DT magnetically recorded on the magneto-optical disk 4 is detected using the first optical spot 5PIIW.

Further, in the second invention, the spot interval 1 between the first and second optical spots SP and SP smz is set to the spot interval 1 of the recording information DTIEC magnetically recorded on the magneto-optical disk 4 by the first optical spot SP□. It was chosen to be approximately an integral multiple of the shortest pit length λ, 2.

Furthermore, in the third invention, the magneto-optical disk 4 is controlled to rotate at a constant angular velocity, and the first and second light spots S
Spot spacing f i of P, ll, I and S P SIX
l, z, ) are changed and controlled according to the recording track information TRIN, TRoUT on which the first optical spots SP, , are formed.

Furthermore, in the fourth invention, the magneto-optical disk 4 is controlled to rotate at a constant angular velocity, and the reference clock signal SCK
At the timing of , a plurality of light spots Sp smz are formed at predetermined intervals β at positions trailing the first light spot SpHW on the 11th recording track TR. , S P s
sz+ and its plurality of light spots S P 5m-
0.SP. , a plurality of received light outputs SFD4°, SPD41 obtained by the return light from the recording track information TR1,4 where the first light spots SP,1w are formed
, TR0LIT, and the first light spot SP
, the recorded information DT magnetically recorded on the magneto-optical disk 4.
MN, is now detected.

Magneto-optical disk device fil of a magnetic field modulation recording method in which the first optical spot SP0 for F-action recording is irradiated in a pulsed manner, 30.
40, a second optical spot SP-mz is formed following the recording track TR where the I-th optical spot SP□ is formed by a predetermined interval 1, and based on the returned light,
Recorded information D magnetically recorded with the first optical spot Spaw
By detecting T□, recorded information DT□
, can be checked almost simultaneously with the record.

Furthermore, first and second optical spots SP*w and SP! are formed on the recording track TR. By selecting the spot interval l of az to be approximately an integral multiple of the shortest pit length λ1.7 of the recorded information, it is possible to reliably check the recorded information DTo at almost the same time as the recording.

Furthermore, in the magneto-optical disk device 30 using the magneto-optical disk 4 that rotates at a constant angular velocity, the recording track T
The spot interval β (f, , f□) of the first and second optical spots SP and SP s-z formed on R is
By controlling the change according to the recording track information TR, . The information DT*Ec can be checked almost simultaneously with the record.

Furthermore, a plurality of light spots SP31t are formed at predetermined intervals on the trailing side of the recording track TR where the first light spot SP31t is formed. , 5PSOI is formed, and a plurality of received light outputs 5PIl14°, S, obtained by the returned light are formed.
4. are synthesized according to the recording track information T RIH and T Rout on which the first optical spot SP□ is formed,
By detecting the magnetically recorded recorded information DTMN+ with the first optical spot 5PII,1, even when the magneto-optical disk 4 rotates at a constant angular velocity, the recorded information DT□ can be reliably detected with a simple configuration. can be checked almost simultaneously with the record.

G example An embodiment of the present invention will be described in detail below with reference to the drawings.

(G1) First embodiment The first embodiment is an application of the first and second inventions,
In FIG.
This figure shows a magneto-optical disk device in which three optical spots are formed on a recording track of a magneto-optical disk by adding a grating to the optical system of the magneto-optical recording device described in No. 03.

That is, in this magneto-optical disk device 1, a magneto-optical disk 4, which has a perpendicularly magnetized film 3 deposited on a transparent protective substrate 2 made of polycarbonate, glass, etc. by continuous sputtering, for example, is mounted on a spindle around an axis 5. Driven by the motor 6, the linear velocity is constant (CL V (c
instant 1inear velocity)
) rotation is controlled.

In the case of this magneto-optical disk device l, a laser beam L1 emitted from a laser light source 7 is transmitted through a collimator lens 8 and a grating 9 into three parallel light beams LIO1L.
After being converted into ll, L12, the light passes through the beam splitter 10 and is focused by the objective lens 11, and as shown in FIG. ) three light spots SP in sequence
! Form Ill, SP, l, 1.5P3112.

In addition, in the magneto-optical disk device 1 of this embodiment,
Of the three optical spots SP, □, SpHW, and 5PSfi2, the central optical spoiler 1-3P□ is used to record and reproduce recorded data, and the preceding optical spot 5P9B1 records, for example, on the recording track TR. Hikari Suboft SP reads address information etc. and follows. The recording data recorded on the recording track TR can be verified using the central optical spot SP.

Here, on the magneto-optical disk 4, a sample format servo pattern is formed in advance in servo areas arranged at predetermined intervals. The returned light beam from spot 5 PIW is bent by 90 degrees by beam splitter lO via objective lens 11, and then passed to analyzer 12.
The light is focused on the photodetector section 13 through the photodetector section 13.

In this way, each light reception output obtained from the 4-split photodetector 13A arranged at the center of the photodetector section 13 is used to perform, for example, tracking control by the bush-pull method and focus control by the astigmatism method, and also to calculate the sum of the light reception outputs. The signal Sl'DI is input to the clock signal generation circuit 14, and as a result, based on the reproduction signal obtained from the servo pattern of the sample format, a reference clock signal S0 (see FIG. 3(A)) for writing and reading recording data is input. ) and sends it to the light emission pulse generation circuit 15 of the laser drive system and the magnetic field modulation circuit 16 of the magnetic head drive system.

The light emission pulse generation circuit 15 of the laser drive system generates a laser light emission pulse SP having a predetermined pulse width τ, which rises at the rising timing of the reference clock signal SCX (time 1+) based on the input reference clock signal SCK.
(FIG. 3(B)), and supplies it to the laser beam a7 through the laser drive circuit 17, thereby sequentially recording three beams on the recording track TR of the magneto-optical disk 4 at the timing of the reference clock signal SCK. Light spot SPss+,
SP, SP, form B□.

On the other hand, the magnetic field modulation circuit 16 of the magnetic head drive system receives recording data DT□ input from, for example, a recording information processing circuit (not shown). is synchronized with the timing of the reference clock signal SCX inputted from the clock signal generation circuit 14, and is used as the magnetic head drive signal S□ (FIG. 3(C)) to generate the '4Hfi stone via the magnetic head drive circuit 18. The magnetic field 19 of the configuration is supplied.

Thus, the polarity of the magnetic helad 19 is reversed in response to the recording data DT, . A magnetic field H1,l (FIG. 3(D)) is applied.

In this way, in this magneto-optical disk device 1, the optical spots SP, 1w are sequentially placed at the center of the magneto-optical disk 4.
By applying the modulated magnetic field H1, whose polarity is inverted based on the value of the recording data DTR1C, to the position where it is irradiated, the recording track TR of the magneto-optical disk 4 is
Even if a recording pattern has already been formed on the recording track TR, the recording data D can be written on the recording track TR without erasing it in advance.
A recording pattern PTN (FIG. 3(E)) is formed by orienting the vertical boride film 3 upwardly or downwardly depending on T and lEc, so that override recording can be performed.

Further, in this magneto-optical disk device 1, three optical spots S Psnt, S P++w, and S Psw are irradiated onto the recording track TR of the magneto-optical disk 4.
+t, the returning light beam of S P smt is bent by 90 degrees by the beam splitter 10 via the objective lens 11 and focused on the photodetector unit 13 via the analyzer 12 .

Thus, the light spot SPS on the trailing side of the photodetector section 13. The received light output signal SPO2 obtained from the photodetector 13B disposed at a position corresponding to is inputted to the recording monitor signal detection circuit 20 having a sample and hold circuit configuration, for example, together with the reference clock signal ScK manually inputted from the clock signal generation circuit 14. Ru.

The interval l between the recording light spot SPRw and the verification light spot S P ssz is determined by the following formula % formula % (1) using the shortest wavelength λ1.7 of the recording data DT□. In this embodiment, the spot interval 1 is selected to be equal to one period of the reference clock signal Scx, that is, the shortest wavelength λlIl,l of the recording data DTIIEc, as shown in FIG. 3(F). .

(Then, at the timing of the reference clock signal 5CII,
By sampling the light reception output signal SPO2, it is possible to detect the monitor data DT, which is obtained by reading out the recording pattern PTN on the recording track TR, with a delay of one cycle of the reference clock signal ScK. Therefore, the recorded data recorded on the recording track TR can practically be checked at the same time as recording.

According to the above configuration, in the magneto-optical disk device using the magnetic field modulation recording method in which the first light spot for recording is irradiated in a pulsed manner, the recorded data recorded on the magneto-optical disk can be recorded with an overall simple configuration. It is possible to realize a magneto-optical disk device that can perform recording and verification at the same time.

(G2) Second Embodiment The second embodiment is the same as the first and third inventions.
is driven at a constant angular velocity (CAV).
The rotation is controlled by angular velocity).

Therefore, in this magneto-optical disk 4, the inner recording track TR+s and the outer recording track TR
In ou1, record data DT□. Thus, while the shortest wavelength λ1 on the inner circumferential side corresponds to the recording pattern PTN (FIG. 4(A)), the shortest wavelength λ1 on the inner circumferential side corresponds to the recording pattern PTN (FIG. 4(A)). A recording pattern PTN (FIG. 4(C)) corresponding to the long shortest wavelength λ, 41 is formed.

Therefore, in the magneto-optical disk device of this embodiment, based on the radius information of the magneto-optical disk 4, the recording optical spot SP and the verification optical spot SP sat
Let the distance be the shortest wavelength λ on the inner and outer circumferential sides, ! 7. and an interval according to λwhL*t, and l! variably controlled to
In this way, even in the case of the magneto-optical disk 4 whose rotation is controlled by CAV, the above-mentioned condition regarding equation (1) is satisfied.

In other words, parts corresponding to those in FIG.
As shown in the figure, in this magneto-optical disk device 230, the grating 9 is attached to a moving means consisting of a moving coil 31, so that it can be controlled to move in the optical axis direction of the optical system as shown by the arrow. There is.

Therefore, by controlling the movable coil 31 according to the radius information of the magneto-optical disk 4, and moving the grating 9 toward the beam splitter IO side in the case of recording track TR work on the inner circumferential side, for example, the recording light spot SPRw can be moved. The interval between the light spots 5Psaz for verification (Fig. 4 (B)) can be controlled to the interval 1 corresponding to the shortest wavelength λm+++1 on the inner circumferential side (Fig. 5 (A)), and conversely, the interval between the optical spots 5Psaz on the outer circumferential side Recording track T
In the case of R0IJT, by moving the grating 9 to the collimator lens 8 side, the recording light spot SP
The interval between *w and the optical spoiler l" S P sat for verification (Fig. 4 (D)) can be controlled to the interval i □ corresponding to the shortest wavelength λsin □ on the outer circumferential side (Fig. 4 (D)).
Figure (B)).

In the case of this embodiment, the shortest wavelengths λ0.1 and λ of the recording patterns PTN and PTN on the inner and outer circumferential sides of the magneto-optical disk 4 are λ0.1 and λ, ! , 1ffi changes, the recording data DT RE over the emission frequency fLD of the laser light source 7 changes.
The frequency f DATA of C is designed to satisfy the relationship expressed by the following equation 1.

According to the above configuration, even when the magneto-optical disk 4 is rotationally controlled by CAV in a magneto-optical disk device using a magnetic field modulation recording method in which the first light spot for recording is irradiated in a pulsed manner, recorded information can be It is possible to realize a magneto-optical disk device that can simultaneously record and verify information.

(G3) Third Embodiment The third embodiment is an application of the first and fourth inventions, and as shown in FIG. 6, in which parts corresponding to those in FIG. In the magneto-optical disk device 40, the laser beam L1 emitted from the laser light source 7 is applied to the grating 4.
1, it is shaped into five light beams L20, L21, L22, L23, and L24 consisting of 0th-order light, +1st-order light, and +2nd-order light.

These five light beams L20 to L24 are irradiated onto the same recording track TR of the magneto-optical disk 4 whose rotation is controlled by the CAV. A light spot is formed.

As a result, a light spot SP corresponding to the zero-order light beam L20
, using the magnetic head 19 at the position where Iw is irradiated. By applying the A1ff field H8, different shortest wavelengths λ,%, . and λa=fi++, a recording pattern PTN corresponding to the recording data DTREC. and PTN, (FIGS. 7(A) and (B)) are formed.

Further, in this embodiment, the +1st order light beam and the +2nd order light beam L20 are placed on the recording track TR of the magneto-optical disk 4 following the optical spora)
21 and L22 or −1st order light and −2nd order light beam L23
and the first and second light spots 5psi according to L24
zo and 5Psxz (FIG. 7(C)) are formed.

Note that this first light spot S P ss2° is arranged so as to have an interval β2° with respect to the light spot SPRw corresponding to the zero-order light beam L20, and furthermore, the first and second light spots
The light spot S P sag. and S P s*z+ is the interval i1. □.

As a result, in this magneto-optical disk device 40,
First and second light spots S P sat. and SP5
m! The + return light is received by photodetectors 42A and 42B provided correspondingly to the photodetector section 42, and two resulting light reception outputs SPO2° and S04. is input to the recording monitor signal detection circuit 43.

In this recording monitor signal detection circuit 43, the light reception output SPO4 of the first optical spot 5PS112° is determined according to the radius information of the recording track TR of the magneto-optical disk 4, for example.
゜ and the resulting delayed output and second optical spoiler) SP. , and sends out monitor data DTMNI by combining the received light outputs 5PD41.

By doing this, the recording data D'r is recorded on the recording track TR on the inner circumference side and the recording track TR0u on the outer circumference side.
++! The shortest wavelength of c is 71 points □. and λ+++i,,l+
Even if the values are different, the recording track is always recorded under optimized conditions with the distances between the first and second optical spots 5Psl12° and SPssz+ relative to the optical spot S P *w corresponding to the zero-order light beam L20 fixed. Recording pattern pTN of TR,N and TR,. and PTN,
It is possible to obtain monitor data DTNN1 by reading out.

According to the above configuration, even when the rotation of the magneto-optical disk 4 is controlled by CAV in a magneto-optical disk device using a magnetic field modulation recording method in which the first light spot for recording is irradiated in a pulsed manner, a simple method can be used. With this configuration, it is possible to realize a magneto-optical disk device that can check recorded information at the same time as it is recorded.

(G4) Other embodiments (1) In the first embodiment described above, the light spot SP si+ preceding the recording light spot SP, 1 on the recording track TR is used to T.R.
I mentioned the case of reproducing the address data above,
The present invention is not limited to this, but uses a hologram element in place of the grating 9, and as shown in FIG.
and a preceding optical spora) SPssi for the optical spot S P 5llz for collation data detection. In this case, the preceding light spot SPsms may be irradiated while being offset to the inner circumferential side of the recording track TR by a predetermined amount.

If the returned light is received by a photodetector divided into two in the recording track TR direction, the recording optical substrate 5P
In addition to the push-pull method using a 4-part photodetector that receives IIW return light, so-called differential push-pull (D P
A sh-pull ) type tracking control circuit can be configured, thereby realizing a more stable tracking servo.

(2) In the second embodiment described above, the movable coil 31
The grating 9 is controlled to move in the optical axis direction of the optical system by controlling the first and second light spots 5PIIW,
Although the case has been described in which the distance [, R (i, , β2)] between spots of 5 Psiz is varied, the present invention is not limited to this. For example, the movement of the grating 9 may be controlled by controlling a small motor, and furthermore, the movement of the grating 9 may be controlled by controlling a small motor. The spot interval x (-iqt
, f2) can also achieve the same effect as in the above embodiment.

(3) In the third embodiment described above, the laser beam L1 is transmitted through the grating 41 to the 0th order light, the ±1st order light and the ±2nd order light.
Although the case has been described in which the light beams are shaped into light beams L20 to L24 consisting of the following light beams, the present invention is not limited to this, and if necessary, a plurality of light beams such as ±3rd order light, ±4th order light, etc. may be used. Also good.

H Effects of the Invention As described above, according to the first invention, a second light spot is formed on the recording track where the first light spot is formed, followed by a predetermined interval.
By forming a light spot and detecting the recorded information magnetically recorded with the first recording light spot based on the returned light, the recorded information can be detected almost simultaneously with recording.

Further, according to the second invention, the spot interval between the first and second light spots formed on the recording track is selected to be approximately an integral multiple of the shortest pit length of the recorded information, so that the recorded information can be reliably recorded. Can be detected almost simultaneously with recording.

Furthermore, according to the third invention, the spot interval between the first and second light spots formed on the recording track is changed and controlled in accordance with the recording track information on which the first light spot for recording is formed. By doing so, it is possible to reliably detect recorded information almost simultaneously with recording even on a magneto-optical disk that rotates at a constant angular velocity.

Furthermore, according to the fourth invention, a plurality of light spots are formed at predetermined intervals on the trailing side of the recording track where the first light spot for recording is formed, and a plurality of light spots obtained by the returned light are By combining the received light outputs according to the recording track information on which the first light spot is formed and detecting the recorded information magnetically recorded in the first light spot, light rotating at a constant angular velocity is generated. Even in magnetic disks, recorded information can be reliably detected almost simultaneously with recording with a simple configuration.

In this way, it is possible to realize a magneto-optical disk device which is capable of forming pits at the correct position on the magneto-optical disk at a predetermined timing, and which can detect and check recorded information at the same time as recording, with an overall simple configuration. The usefulness of the optical 6R disc device can be further improved.

[Brief explanation of the drawing]

FIG. 1 is a route diagram showing the optical disk device according to the first embodiment of the present invention, FIG. 2 is a route diagram showing the arrangement of its optical spots, and FIG. 3 is for explaining its operation. FIG. 4 is a timing chart showing the relationship between the optical spot spacing and the recording backs on the inner and outer peripheries of the second embodiment, and FIG. 5 is a timing chart showing the optical system of the magneto-optical disk device according to the second embodiment. FIG. 6 is a schematic diagram showing a magneto-optical disk device according to the third embodiment, and FIG. 7 is a timing chart [1, 8] for explaining its operation.
The figure is a route map showing the arrangement of light spots according to another embodiment. 1.30.40...Magneto-optical disk device, 4.
...Magneto-optical disk, 7...Laser light source, 8...Collimator lens, 9.41...
... Grating, 10 ... Beam splitter, 11 ... Objective lens, 12 ... Analyzer, 13.42 ... Photodetector section, 1
9...Magnetic head, 20.43... Recording monitor signal detection circuit.

Claims (4)

[Claims] (1) At the timing of a predetermined reference clock signal, a first optical spot is sequentially formed on the recording track of the magneto-optical disk, and in synchronization with the reference clock signal, a predetermined optical spot whose polarity is reversed according to the recording information is formed. In a magneto-optical disk device configured to magnetically record the recorded information on the magneto-optical disk by applying a modulated magnetic field, the first optical spot on the recording track is sequentially moved at the timing of the reference clock signal. A second light spot is formed at a position trailing by a predetermined distance from the second light spot, and the first light spot is used to direct the light at the first light spot based on the light reception output obtained by the return light from the second light spot. A magneto-optical disk device characterized in that the recorded information magnetically recorded on a magnetic disk is detected. (2) In the magneto-optical disk device according to item 1, the spot interval between the first and second optical spots is set to
A magneto-optical disk device characterized in that a light spot is selected to be approximately an integral multiple of the shortest pit length of the recorded information magnetically recorded on the magneto-optical disk. (3) In the magneto-optical disk device according to item 1, the magneto-optical disk is controlled to rotate at a constant angular velocity, and the first light spot is formed with a spot interval between the first and second light spots. A magneto-optical disk device characterized in that change control is performed in accordance with the recording track information. (4) In the magneto-optical disk device according to item 1, the magneto-optical disk is controlled to rotate at a constant angular velocity, and is sequentially directed to the first optical spot on the recording track at the timing of the reference clock signal. A plurality of light spots are formed at predetermined intervals at a trailing position, and a plurality of light reception outputs obtained by the return light from the plurality of light spots are recorded in the recording in which the first light spot is formed. A magneto-optical disk device, characterized in that the recorded information is synthesized according to track information and is magnetically recorded on the magneto-optical disk using the first light spot.