JPS63253537A - One-beam laser recorder - Google Patents

Abstract

PURPOSE:To make a reproducing time for confirmation unnecessary with an one-beam laser recorder which performs erasing or recording on a recording medium in accordance synchronizing signals, by causing confirmation of erasing and recording to be made by giving reproducing pulses with the time of one cycle of signals which are delayed by a prescribed time. CONSTITUTION:Pulse signals for writing from a recording pulse forming circuit 3 are inputted to a confirmation reproducing pulse forming circuit 6 and pulse signals for readout outputted from the circuit 6 are outputted to an output terminal 7, from which the pulse signals are inputted to a laser device, through an OR circuit 5. When the pulse signals for readout are synchronizing signal generating circuit 2 are supplied to the laser device at every cycle as pulse signals for writing and projected on an optical disk which is not shown in the figure. At a light receiving section 8 composed of a photosensor, recording signals are read out and supplied to a multiplexer 10 through an amplifier 9 and, simultaneously, the multiplexer 10 through a delay line 11 and recording is confirmed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a recording device for recording media such as optical discs and magneto-optical discs that perform erasing or recording using an l-beam laser.

[Summary of the invention]

The present invention is a recording device for a recording medium such as an optical disk or a magneto-optical disk that performs erasing or recording with a single beam laser, in which a laser pulse for erasing or recording is applied to the recording medium based on a synchronization signal, and the erasing or recording is performed using a single beam laser. In the l-beam laser recording device, a reproducing laser pulse is applied within one period of a synchronization signal delayed by a predetermined time from an erasing or recording laser pulse to confirm erasing or recording. This allows erasing or recording and confirmation of the erasing or recording at the same time using a single beam laser.

[Conventional technology]

Conventionally, when writing data to an optical disk or magneto-optical disk, a laser beam is irradiated along a predetermined trunk on the disk, and pits are formed in a predetermined pattern on the track to write the data. I was doing it.

On the other hand, the data written on the disk in this way is
Since writing is often not performed correctly, it is necessary to confirm the written data, which is called verify (verlfy), after writing.

[Problem that the invention seeks to solve]

However, there is an inconvenience in that checking the written data requires time and effort.

In other words, in the case of a one-beam laser recording device, the laser beam scans one track to record (write) data, and then the laser beam scans this trunk again to read the recorded data and combine it with the recorded data. I was checking to see if I could read out the same signal. When 61 verification is performed in this manner, the trunk must be scanned twice in order to record one track of data, resulting in an inconvenience that the data processing speed decreases.

In addition, if you use a recording device with two laser beams, you can use one beam for writing data and the other one for reading data for confirmation, so that data δ can be written and confirmed at almost the same time. It can be done without significantly slowing down data processing speed. However, the two-beam laser recording device has the disadvantage of being complicated and expensive.

In view of these points, it is an object of the present invention to provide an l-beam laser recording device that can confirm recording using only a -beam laser without reducing the data processing speed.

Means for Solving Problem C] The one-beam laser recording device of the present invention applies erasing or recording laser pulses to a recording medium based on a synchronization signal, for example, as shown in FIG. In the one-beam laser recording device, a reproducing laser pulse is applied within one period of a synchronization signal delayed by a predetermined time from the erasing or recording laser pulse to confirm erasing or recording. .

[For production]

According to the one-beam laser recording device of the present invention, since erasing or recording and reproduction are performed alternately in a time-sharing manner using a one-beam laser, it is possible to confirm the previous erasing or recording by reproducing immediately after erasing or recording. . Since the reproducing laser pulse is supplied within one period of the synchronizing signal for supplying the erasing or recording laser pulse, no time is required for this confirmation reproduction, and the data processing speed can be increased.

〔Example〕

An embodiment of the one-beam laser recording device of the present invention will be described below.
Let me explain with reference to the attached drawings.

The recording apparatus of this example uses a magneto-optical disk as a recording medium, and records or erases data by changing the direction of magnetization using a laser beam, and is constructed as shown in FIG. 1. In FIG. 1, ill indicates a recording data processing section, which supplies recording data outputted by this recording data processing section fil to a laser device and writes (records) it on a magneto-optical disk (not disclosed). At this time, this writing is performed in synchronization with the synchronization signal output by the synchronization signal generator (2). That is, the synchronizing signal output from the synchronizing signal generator (2) is supplied to the recording pulse forming circuit (3).

This pulse forming circuit (3) receives one of the supplied synchronizing signals.
This is a circuit that outputs a data write pulse signal once every cycle, and this write pulse signal is used for a period sufficient to write data, that is, to maintain the temperature of the laser beam irradiated part of the magneto-optical disk, which is a recording medium. This is a signal that remains at a high level for a period sufficient to cause the signal to rise to one or more points. The write pulse signal output from the pulse forming circuit (3) is then supplied to the gate circuit (4). Then, the recorded data processing section +
The recording data outputted by 11 is supplied to the gate circuit (4). The recording data to be supplied to this gate circuit (4) is a high level signal "1" or a low level signal "0" (1td), and when the high level signal "1" is supplied, the above-mentioned write pulse signal is supplied. As is, the gate circuit (4
), and when a low level signal "0" is supplied, the above-mentioned write pulse signal is not output.

Then, the write pulse signal output from this gate circuit (4) is sent to an output terminal (7) via an OR circuit (5).
), and the writing pulse signal obtained at this output terminal (7) is supplied to a laser device (not shown) comprising a semiconductor laser or the like. By doing this, when the recording signal is a high level signal "1", the laser beam is irradiated from the laser device to the magneto-optical disk, which is the recording medium, only during the high level period of the pulse signal for one penetration, and the laser beam is emitted from the laser device. The magnetization direction at the center of the beam irradiation location changes. Further, when the recording signal is a low level signal "0'", there is no output of the write pulse signal, so there is no laser beam irradiation from the laser device, and there is no change in the magnetization direction.

In this example, immediately after the recording signal is written in this way, the signal is read out. That is, in this example, write pulse No. 13 outputted from the recording pulse forming circuit (3) is supplied to the confirmation/reproducing pulse forming circuit (6). This confirmation reproduction pulse forming circuit (6) is a circuit that outputs a subsequent output pulse signal after a predetermined period of time has passed after the supplied write pulse signal changes to low level, and the write pulse signal changes to low level. The time from when the reading pulse signal changes to high level is the time required for the magneto-optical disk, which has become hot for recording, to cool down to below the Curie point.
Further, this read pulse signal is a signal that remains at a high level for a period sufficient to read data, that is, a period during which the temperature of the laser beam irradiated portion of the magneto-optical disk does not rise above one Curie point. Then, the read pulse signal outputted from the confirmation reproduction pulse forming circuit (6) is applied to the OR circuit (5).
) to the output terminal (7), and this output terminal (7
) is supplied to the laser device. In this way, the readout pulse No. 13 is supplied to the laser device with a delay of the write pulse signal every cycle of the synchronization signal output by the synchronization signal generator (2), and is used as a magneto-optical pulse for readout every cycle. The disk is irradiated with a laser beam.

The recording signal is read out by the laser beam irradiation by the light receiving section (8). The light receiving section (8) is composed of a photodiode or the like, and successively outputs a light receiving signal corresponding to the irradiated laser beam and supplies it as a signal to the multiplexer 0φ via the amplifier (9). Further, a synchronization signal from the synchronization signal generator (2) is delayed and supplied to the multiplexer O1 via a delay line 0υ, and based on this delayed synchronization signal, a laser beam is generated by the above-mentioned readout pulse signal. The structure is such that only the readout signal of the return light of the irradiation is supplied to the peak value detection circuit side. Then, on this peak value detection circuit surface, a pulse forming circuit for confirmation reproduction (6
) is supplied via the delay line 01, the level of the read signal is detected at the timing of this read pulse signal, and the detection signal is sent to one circuit Oa.
is supplied to one of the detection signal input terminals.

Then, the recording data output from the recording data processing section (1) is input to the other detection signal input terminal of the minus number output circuit 041 on the delay line a! The level of the recorded data is compared with the level of the read signal in this minus number output circuit (company), and the comparison result is supplied as a detection signal to the recorded data processing section (1). Based on the signal, the recording data processing unit (11) determines whether the immediately previous recording was performed accurately.

The recording apparatus of this example is configured as described above, and the operation during recording will be described below.

First, in this example, the synchronizing signal outputted by the synchronizing signal generator (2) is a pulse signal with one cycle of 90 ns as shown in FIG. 2A. When this 90ns interval synchronization signal is supplied to the recording pulse forming circuit (3), the second
As shown in Figure B, this forming circuit (3) has one period, that is, 90
A pulse signal that goes high for 22 ns once every ns is periodically output. The recording data output by the recording data processing unit +11 is written in synchronization with this pulse signal, but in this example, this recording data includes rl, 1, 0.
．． 0. It is assumed to be 5-bit data of IJ.

This writing state is shown in FIG. 3. First, "1" is recorded, but at this time, a high level signal "B" is output as recording data from the recording data processing section (11), as shown in FIG. 2C. As a result of this high level signal "1", the write pulse signal of this period is supplied as it is to the laser device via the output terminal (7), and the laser beam 11 is applied to the magneto-optical disk during the high level period of this pulse signal, that is, 22 ns. (FIG. 3A).

As a result of this irradiation, the temperature at the center of the laser beam 11 reaches a single Curie point, and the recording part p, whose magnetization direction is reversed,
is formed (Fig. 3B). Next, a read pulse signal as shown in the second figure is output from the confirmation reproduction pulse forming circuit (6) at 1 ons7i of this write pulse signal, and this pulse signal is supplied to the laser device, and during the high level period of this pulse signal. That is, the laser beam 12 is irradiated for 3 ns (FIG. 3C).

At this time, this laser beam! Since the immediately preceding recording section P1 is within the irradiation range of 2, the return light of this laser beam received by the light receiving section (8) becomes the light that detected the recording section PI, and the subsequent recording section 13 of this recording section P. as an amplifier (9),
The signal is supplied to the one-loss detection circuit αa via the multiplexer θΦ and the peak value detection circuit Q21. Then, since the recording signal when the recording section p is recorded is supplied to this defeat detection circuit 0 via the delay line QSI, this readout signal and the recording signal are compared, and when the defeat is detected, The coincidence detection signal is supplied to the recording data processing section +11. When this -defeat detection signal is supplied, the recording data processing unit (11) confirms that the recording signal "l" has been written correctly.In this way, one round of the synchronous f3 Data writing and confirmation are performed within (90 ns).Note that from the irradiation of the laser beam 11 for writing to the laser beam 1 for reading
Since it takes Ions until the second irradiation, the temperature of the point directly irradiated with the laser beam β falls below one Curie point in this 1 ounce, the magnetization direction is determined, and reading becomes possible. In addition, the peak value of the output of the laser beam 12 for reading is assumed to be the same as the peak value of the output of the laser beam 11 in this example, but since the irradiation time is as short as 3 ns, the temperature of the irradiated area is more than one Curie point. does not change the direction of magnetization, and does not erase recorded data.

Then, when writing and confirmation within one period of the synchronization signal are completed, the next data rlJ is recorded in the next period. At this time as well, the next write pulse signal is supplied as is to the laser device in the same manner as described above, and the laser beam 13 is irradiated for 22 ns (FIG. 3D) to form the recording portion P2. Immediately after irradiation with this laser beam 13, a read pulse signal is supplied to the laser device, and the laser beam is emitted during ans! .

is irradiated (FIG. 3E). At this time, since the immediately preceding recording section P2 is within the irradiation range of this laser beam 14, the readout signal of this recording section P2 is supplied to several circuits Oa. Writing is confirmed by comparison with the recorded signal.

When this writing and 61Lfl are completed, the next data "0" is recorded in the next synchronization signal cycle, but at this time, the record data output by the record data processing circuit +11 is a low level signal "0". Therefore, the writing pulse signal of this period is not supplied to the laser device, and the writing laser beam is not irradiated within this period (Fig. 3 F).
. Then, even within this period, a read pulse signal is supplied to the laser device, and the laser beam 1 is irradiated for 3 ns (FIG. 3G).

At this time, since there is no recording section near the center of the irradiation range of this laser beam l, several read signals indicating that there is no recording signal are supplied to the output circuit aa, and the recording signal (low level signal The recording state is confirmed by comparison with '0'').

When this confirmation of writing (absence) is completed, the next data "0" is recorded in the next cycle of the same 11II signal.

At this time, as well as when recording data "0" mentioned above, there is no irradiation of the laser beam for writing within this cycle (
3H), and the laser beam Il& is irradiated for 3 ns by supplying the read pulse signal within this period (see the third diagram, the recording state is checked).

When this writing (absence) confirmation is completed, the next data "1" is recorded in the next synchronization signal cycle. At this time, the writing laser beam l is irradiated (FIG. 3J) in the same way as when recording the data rlJ described above, and the recording part P
3 is formed, and then the reading laser beam 18 is irradiated (FIG. 3K), and this irradiation causes the Tl of the recording part P to be
'l! verification will be carried out.

By writing data in this way, the laser beam irradiation from the laser device is performed using a read pulse signal synchronized with the write pulse signal W when the recording data is "1" and the synchronization signal, as shown in FIG. 2E. The recording data "1°1.0,0.IJ" is written and the writing is confirmed.The writing is confirmed by irradiation with the recording laser beam. Since this check is performed during a short period of time when the recording is not being performed, the recording time is not increased due to this confirmation, and the data processing speed for recording becomes faster.Furthermore, the laser beam from the recording laser Since it is used for writing and reading in a time-division manner, a single beam laser device can be used, and the configuration of the recording device is simplified.

Note that the data recording state shown in FIG. 3 is a case where signal recording is performed on a trunk formed on a relatively inner circumference of the magneto-optical disk, and in this case, if data "1" is continuously written, the recording section is P, and P! However, if the same data is recorded on a track formed relatively on the outer periphery of the magneto-optical disk, the track length will be long as shown in Figure 4A-K. Even if data rlJ is written continuously, each recording portion PL+h, etc. becomes isolated. Note that the laser beam l shown in FIG. 4 A to K
,~1. were irradiated in the same manner as in the example in FIG. .

P is formed. Further, in the above example, recording is confirmed, but erasing by laser beam irradiation can be confirmed in the same way.

Although the above embodiment has been described as a recording device for a magneto-optical disk, it is easy to understand that the present invention can be applied to a recording device for other recording media such as an optical disk. Furthermore, the present invention is not limited to the above-described embodiments, and it goes without saying that various other configurations may be adopted without departing from the gist of the present invention.

〔Effect of the invention〕

According to the one-beam laser recording device of the present invention, since recording and checking of this recording can be performed using a one-beam laser, the configuration is simple, and no time is required for playback for checking, thereby increasing the data processing speed. There are profits that can be made.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of a beam laser recording apparatus of the present invention, and FIGS. 2, 3, and 4 are diagrams for explaining the example in FIG. 1, respectively. (2) is a synchronous I ε generation earthenware (3) is a pulse forming circuit for recording, and (6) is a pulse forming circuit for confirmation reproduction.

Claims (1)

[Claims] In a one-beam laser recording device in which erasing or recording laser pulses are applied to a recording medium based on a synchronization signal to erase or record, A one-beam laser recording device characterized in that a reproducing laser pulse is applied within one cycle of the synchronizing signal to confirm erasing or recording.