JPS63211172A - Recording device for magneto-optical disk - Google Patents

Abstract

PURPOSE:To simply restart data recording even if data recording is interrupted by reading out a track address and then stopping the data recording. CONSTITUTION:Guide grooves 16 and recording tracks 18 are formed on an area A of a disk 10 and an address area 24 is formed on a part of the area A. At the time of data recording, laser beam reflected light from the groove 16 and reflected light from the track 18 are respectively received by two-divided photosensors PSs 54, 56 in a photodetector 48, reflected light from the groove 16 and reflected light from the track 18 are respectively received by four-divided PSs 62, 64 in a photodetector 52 and a signal including a track address is supplied to an address decoder 74. When a switch 78 is turned on at the time of interrupting data recording, recording in the track 18 is continued, but when an optical pickup passes the area 24, a signal is sent from a gate 76 based on the output of the decoder 74 and the radiation of a laser beam to the track 18 is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) This invention relates to a magneto-optical disk recording device, and in particular to a method for recording data on a magneto-optical disk in which a track address is prerecorded by pits in a part of a magnetic recording area. I do,
It relates to a recording device.

(Background Art) An example of this type of recording device is disclosed in, for example, Japanese Patent Application Laid-Open No. 12956/1983 filed by the present applicant. In this recording device, a biphase modulated address signal is read from a track address, and the rotational speed of the disk is controlled by the address signal.

(Problems to be Solved by the Invention) In the recording device as described above, if a track address signal cannot be detected due to scratches or dust generated in the track address area, and if recording is interrupted, the next time recording is restarted, However, it was difficult to know how much information had been recorded.

For example, if data has been recorded up to track address 1,000, the track address data is 9.
1,00 when it is unreadable from address 00.
If recording is interrupted at address 0, it will take a long time to find out that the track address data from address 900 cannot be read, and even if address 899 is found that can be read, additional recording will not be possible at address 900. had to be done from That is, if recording is interrupted while the track address data is unreadable, additional recording can only be performed from readable addresses. For this reason, in conventional devices, when data recording is interrupted, operations to avoid duplicate recording and restart recording may become extremely complicated.

Therefore, the main object of the present invention is to provide a system that allows data recording to be easily resumed even if data recording is interrupted.
An object of the present invention is to provide a recording device for a magneto-optical disk.

(Means for Solving the Problems) The present invention provides a magneto-optical disk in which a track address is formed in advance in a part of the recording area, and a magneto-optical disk for recording data in the recording area by irradiating a light beam onto the magneto-optical disk. a recording means, an address reading means for reading a track address when recording data, a switch operated to end data recording, and a recording means until the address reading means reads the track address when the switch is operated. It is a magneto-optical disk recording device, which is equipped with a termination means for continuing a predetermined recording. This is done by When a light beam is irradiated, the direction of magnetization of the irradiated part is reversed, and this reversal of the direction of magnetization causes
Data is recorded in the recording area as magnetic data.

On the other hand, the track address of the trunk corresponding to the portion where data is recorded is read by the address reading means.

Therefore, if it is desired to interrupt data recording, a switch is operated. When the switch is operated, the termination means causes the recording means to continue predetermined recording until the address reading means reads the track address. While the predetermined recording is being continued, when the address reading means reads the track address, the irradiation of the light beam of the recording means is stopped, and the recording operation of the recording means is stopped for the first time.

(Effects of the Invention) According to the present invention, even if a switch for stopping recording is operated, the recording means continues predetermined recording until the address reading means reads the track address by the termination means, and the track address is read out by the recording means. Since the recording means is stopped after reading, the track address of the track where recording was stopped is clear, so even when restarting recording next time, for example by additional recording,
You can immediately resume recording from the next track. Therefore, unlike conventional devices, complicated operations for avoiding duplicate recording are not necessary.

The above objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

(Embodiment) FIG. 2 is a plan view showing a magneto-optical disk used in an embodiment of the present invention. The magneto-optical disk 10 includes a transparent plastic substrate 12.
2 is made of polycarbonate, acrylic (PMMA) resin, or the like. A hole 14 is bored in the center of the transparent plastic substrate 12 to serve as a positioning hole when the magneto-optical disk 10 is mounted. Then, in the donut-shaped area A,
The guide groove 16 is formed spirally or concentrically.

An enlarged cross-sectional view of the transparent plastic substrate 12 is shown in FIG. 3(A).
As shown in FIG. 1, a land is formed between the guide grooves 16 described above, and this land portion becomes a recording track 18.

A perpendicularly magnetized film 20 is formed on the surfaces of these guide grooves 16 and recording tracks 18 by sputtering, vapor deposition, or the like. This perpendicular magnetization film 20 is made of, for example, an amorphous alloy of a rare earth metal and a transition metal such as GdTbFe9TbFeCo. Further, as will be described later, when the perpendicular magnetization film 20 is irradiated with a spot light of a laser beam, the direction of magnetization of the irradiated portion is reversed, and data is magnetically recorded by this reversal of magnetization. Reproduction of recorded data utilizes the fact that when a laser beam is irradiated, reflected light is deflected according to the direction of magnetization.

A dielectric film 22 is coated on the perpendicular magnetization film 20 for the purpose of protecting the perpendicular magnetization film 20. The dielectric film 22 is formed to fill in the irregularities on the perpendicularly magnetized film 20, and therefore, as shown in FIG. 3(A), both surfaces of the magneto-optical disk 10 are formed as flat surfaces. During recording and reproduction, a laser beam is irradiated from the transparent plastic substrate 12 side.

In FIG. 2, an address area 24 is provided in a part of the donut-shaped area A. In this address area 24, information indicating the position of the track is recorded in advance in bits. That is, in the address area 24,
) shows a series of bits 2 in the guide groove 16.
6 is provided.

An example of the data format of the track address formed by bit 26 is shown in FIG. The address area 24 includes a synchronization signal pattern 28. Track address data 30
and CRC data 31 are repeatedly recorded. If the same track address data 30 is recorded in this manner, even if a dropout occurs at one location, the track address data will not become unplayable. As the synchronization signal pattern 28, for example, a 12-bit combination "111111111010" is recorded. Track address data 30 is recorded as a 5-digit BCD code, and therefore this data is 20-bit data. CRC data 31 is 16-bit data.

These synchronization signal patterns 28. recorded by bits 26 on the guide groove 16. In this embodiment, track address data 30 and CRC data 31 are recorded as bi-phase modulated digital signals in consideration of ease of clock reproduction and ease of error detection.

FIG. 5 is an illustrative diagram showing an example of an optical pickup used in an embodiment of the present invention. The optical pickup 32 is
Data recorded on the magneto-optical disk 10 described in detail with reference to FIGS. 2 and 3 is read.

During recording, the two laser beams emitted from the two-beam laser diode array 34 first pass through the collimator lens 36 . The light is focused through the polarizing beam subrifter 38 and the objective lens 40, and is irradiated onto the magneto-optical disk 10 as a beam spot.

Although it is not clear in FIG. 5, the two laser beams have different wavelengths and are irradiated onto the guide groove 16 or the recording track 18 on the magneto-optical disk 10, respectively.

The laser beam irradiated onto the guide groove 16 is used to read the track address and to control the tracking and focusing of the optical pickup 32.

The laser beam irradiated on the recording track per day is used for recording, reproducing, and erasing data. Regarding these two laser beams, the reflected light from the magneto-optical disk 10, which will be described in detail later, is vertically reflected, passes through the objective lens 40 and the polarizing beam splitter 38, and enters the half-wave plate 42 again. The incident light of the 1/2 wavelength plate 42 is
Thereafter, the light is focused by a focusing lens 44 and incident on a polarizing beam splitter 46 .

A portion of the light incident on the polarization beam subbook 46 passes through the polarization beam splinter 46 and becomes incident light on the photodetector 48 .

On the other hand, the light reflected by the polarizing beam splitter 46 is received by the photodetector 52 after passing through the cylindrical lens 50 .

FIG. 1 is a block diagram showing the main parts of an embodiment of the present invention. In FIG. 1, photodetector 48 includes a two-part photosensor 54 and a photosensor 56, although it was not obvious in FIG. The two-split photosensor 54 receives the reflected light of the laser beam irradiated onto the guide groove 16 .

The photosensor 56 receives the reflected light of the laser beam irradiated onto the recording trunk 18 .

The two-divided photosensor 54 detects a tracking error signal, that is, how far the optical pickup 32 is deviated from the guide groove 16 by detecting the difference in output between the divided elements, and also detects a tracking error signal, that is, how far the optical pickup 32 is deviated from the guide groove 16, and also detects a four-divided photo sensor to be described later. The track address is detected by adding the outputs of the sensors.

Therefore, the two outputs of the two-split photosensor 54 are given as re-inputs to the differential amplifier 58, and are also given to the amplifier 62 as two outputs. Therefore, a tracking error signal is obtained from the output terminal of the differential amplifier 58.

Photodetector 52 includes a four-part photosensor 62 and a photosensor 64. Like the two-divided photosensor 54, the four-divided photosensor 62 receives the reflected light of the laser beam irradiated onto the guide groove 16.

The photosensor 64, like the photosensor 56 described above, receives the reflected light of the laser beam irradiated onto the recording track 18.

The four outputs of the four-division photosensor 62 are applied to a total of four input terminals of amplifiers 66 and 68, respectively.

The outputs of amplifiers 66 and 68 are then output to differential amplifier 7.
0 is re-inputted, and the amplifier 60 is powered by two people. Therefore, a focus error signal is obtained from the output terminal of the differential amplifier 70. Based on this focus error signal, focus control of the pickup 32, that is, focusing control is performed.

The signal output from the output terminal of amplifier 60 is given to address decoder 74. The address decoder 74 is
The signal supplied from the amplifier 60, that is, the reproduction signal of the track address formed by the pits 26, is converted into, for example, 4-bit single-digit address data. In addition,
Since the track address data 30 is recorded in the address area 24, the address area 24 is
When it is not located directly above, the two-part photo sensor 54
And the reflected light of the pit 26 is not received by the 4-division photosensor 62. Therefore, at this time, address decoder 74 does not output address data. Therefore, no address OK signal is applied from address decoder 74 to one terminal of AND gate 76. That is, the address OK signal is output when the address decoder 74 is converting the track address data 30 into, for example, 4-bit, 1-digit address data.

The other input terminal of AND gate 76 is connected to one terminal of switch 78 . The other terminal of switch 78 is applied with DC voltage Vcc. The switch 78 is operated to temporarily stop or end recording of data on the recording track 18. Therefore, when the switch 78 is operated and one input terminal of the AND gate 76 is at a high level, when a high level address OK signal is output from the address decoder 74, a beam off signal is output at the output terminal of the AND gate 76. The beam off signal outputted is the recording trunk 1 in the laser diode array 34.
This is a signal for stopping the laser beam for irradiating 8. Therefore, even if the switch 78 is turned on when recording is temporarily stopped, if the address OK signal is not output, that is, if the address data is not read out from the address decoder 74, the beam off signal will not be output from the AND gate 76. .

For example, even if the switch 78 is operated when the address area 24 is not located directly above the pickup 32, the beam off signal is not output immediately and the magneto-optical disk
Due to the rotation of O, the address area 24 is moved to the pickup 3.
2, a beam off signal is output from the AND gate 76.

Furthermore, even if the address area 24 is located directly above the pickup 32, bit 26 of the address area 24
Similarly, when the reflected light cannot be received due to scratches, dust, etc., the AND gate 76 does not immediately output a beam-off signal. At this time, magneto-optical disk 1
0 rotates and address area 24 is picked up again by 32
A beam off signal is output for the first time when the reflected light from the bit 26 of a different guide groove 16 located directly above is received.

On the other hand, the outputs of the photosensors 56 and 64 of the photodetectors 48 and 52, respectively, are given to the (-) and (+) terminals of the differential amplifier 72. Therefore, the output terminal of the differential amplifier 72 outputs a magneto-optical reproduction signal. The differential amplifier 72 outputs a reproduction signal of data magnetically recorded on the recording track 18 of the magneto-optical disk 10 based on the amount of light received by the photosensors 56 and 64.

In operation, during data recording, two laser beams are irradiated from the laser diode array 34 toward the magneto-optical disk 10 . One of the laser beams is irradiated onto the guide groove 16 of the magneto-optical disk 10 . The other laser beam is irradiated onto the recording track 18. The reflected light of these laser beams is then passed through the objective lens 40. Via polarizing beam splitters 38 and 46, photodetector 48
and 52.

The two-split photosensor 54 of the photodetector 48 has a guide groove 1.
6 is received, and the photo sensor 56 receives the reflected light of the recording track 18.

The four-divided photosensor 62 of the photodetector 52 has a guide groove 1.
6 is received, and the photo sensor 64 receives the reflected light of the recording track 18. 2-split photosensor 5
Based on the output of the 4- and 4-split photosensor 62, a reproduced signal of the bit 26 formed in the guide groove 16, that is, a signal including the track address, is output from the output terminal of the amplifier 60.

On the other hand, a magneto-optical reproduction signal is output from the output terminal of the differential amplifier 72 based on the light received by the photosensors 56 and 64. This magneto-optical reproduction signal is a reproduction signal of data recorded on the recording track 18 of the magneto-optical disk 10 by irradiating a laser beam from the laser diode array 34, that is, magnetic data.

Here, when data recording is interrupted, the switch 78 is turned on. Even when the switch 78 is turned on, the laser beam of the laser diode array 34 for irradiating the recording track 18 is transmitted from the address decoder 74 to the address O.
It will not stop immediately unless the K signal is output. That is, even if the switch 78 is turned on, when the address decoder 74 is not outputting address data, specifically, the two-segment photosensor 54 and the four-segment photosensor 62 do not receive the reflected light of bit 26. When recording track 18 from laser diode array 30
Irradiation of the laser beam to the target is not stopped. At this time, if the data being recorded is audio data, recording of data continues in the recording track 18 in a silent state. Therefore, as the magneto-optical disk 10 rotates, the address area 24 is placed directly above the optical pickup 32, so that the reflected light of the bit 26 is received, and when the address decoder 74 outputs an address OK signal, the AND gate 76 A beam off signal is output from the With this beam off signal, the laser beam of the laser diode array 34 that irradiates the recording trunk 18 is stopped for the first time. Furthermore, when the address OK signal is output,
That is, when the address area 24 is located directly above the pickup 32 and the switch 78 is operated, the laser diode array 3 for irradiating the recording trunk 18 is activated.
4 laser beam is stopped immediately. However, when the switch 78 is turned on immediately after passing through the address area 24, it takes time for the address area 24 to be placed directly above the pickup 32 again, so it takes time for the beam off signal to be output. It takes.

To restart the interrupted recording, that is, to perform additional recording, first, the switch 78 that is in the on state is turned off. Then, the pink-up 32 is placed on a predetermined track based on the address data last read when recording is temporarily interrupted, that is, the track address data stored in an address register (not shown). Then, from the laser diode array 34 to the guide groove 16 and the recording trunk 1.
Recording can be immediately resumed by irradiating laser beam 8.

Next, the operation of reproducing data recorded on the magneto-optical disk 10 will be explained. During reproduction, the wavelength of the laser beam from the laser diode array 34 that is irradiated onto the recording track 18 is switched for reproduction. Therefore, even if the recording track 18 is irradiated with a laser beam, the direction of magnetization of the perpendicular magnetization film 20 of the recording track 18 does not change.

This reflected light from the perpendicularly magnetized film 20 is detected by the photosensors 56 and 64 of the photodetectors 48 and 52, respectively, as in the case of recording. Then, a magneto-optical reproduction signal is output from the output terminal of the differential amplifier 72 based on the reflected light from the photosensors 56 and 64.

On the other hand, even during reproduction, the wavelength of the laser beam irradiated onto the guide groove 16 from the laser diode array 34 is the same. Therefore, the light reflected from the guide groove 16 is received by the two-split photosensor 54 and the four-split photosensor 62 of the photodetectors 48 and 52, as in the case of recording. Then, the output terminal of the amplifier 60 receives the pit 26 based on the reflected light.
A playback signal corresponding to is output. This reproduced signal is then converted by the address decoder 74 into, for example, 4-bit, 1-digit address data. Based on this converted address data, for example, the rotational speed of the magneto-optical disk 10, more specifically, the linear velocity of the magneto-optical disk 10 relative to the optical pink-up 32, etc. are determined.

The operation during data erasing is almost the same as the operation during recording described above, except that the wavelength of the laser beam of the laser diode array 34 that irradiates the recording track 18 is changed.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the main parts of an embodiment of the present invention. FIG. 2 is a plan view showing a magneto-optical disk used in this embodiment. FIG. 3 is a cross-sectional view and an enlarged view of essential parts of the magneto-optical disk shown in FIG. 2. FIG. 4 is a diagram showing an example of the format of track address data formed in the guide groove. FIG. 5 is an illustrative diagram showing an example of an optical pickup used in an embodiment of the present invention. In the figure, 10 is a magneto-optical disk, 16 is a guide groove, 1
8 is a recording track, 26 is a pit, 32 is an optical pickup, 48.52 is a photodetector, 54 is a 2-split photosensor, 56.64 is a photosensor, 62 is a 4-split photosensor, 60, 66.68 are amplifiers , 74 is an address decoder, 76 is an AND gate, and 78 is a switch. Figure 1 Figure 3 (A) (B) Figure 4 Figure 5

Claims (1)

[Scope of Claims] 1. A magneto-optical disk in which a track address is formed in advance in a part of a recording area, a recording means for recording data in the recording area by irradiating the magneto-optical disk with a light beam, and the data. address reading means for reading out the track address during recording; a switch operated to end recording of the data; and when the switch is operated, the address reading means reads out the track address until the address reading means reads out the track address. A recording device for a magneto-optical disk, comprising a termination means for continuing predetermined recording with a recording means. 2 The address reading means reads out the read CR.
and a determination means for determining whether the data at the address is correct based on the C data, and the termination means causes the predetermined recording to be performed until the data at the address is determined by the determination means. A magneto-optical disk recording apparatus according to claim 1, comprising: means.