JP3247780B2 - Multi-beam recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-beam recording / reproducing apparatus which determines an optimum recording condition for each recording medium to be used and improves an error rate of reproduced data by recording under the condition.

[0002]

2. Description of the Related Art A first conventional example is disclosed in Japanese Patent Application Laid-Open No. 59-193.
544, there is a signal recording method. In this apparatus, first, when the recording condition is determined, a signal is recorded on a recording medium 4 such as a magneto-optical disk while changing the intensity of the recording light e by the light control means 5 as shown in FIG. 3, and the recorded signal is reproduced. After the recording condition determining means 3 determines the optimum value of the recording light intensity at which the amplitude of the reproduction signal f is maximized, the light control means 5 controls the recording light intensity so as to be optimal at the time of the next normal recording. Normal signal recording was performed.

A second embodiment is disclosed in Japanese Patent Publication No. 59-35.
090, there is an information recording device. In this example, the optimum recording condition is determined according to the width and size of the waveform of the reproduction signal.

FIG. 4 shows a flowchart of these operations. First, a signal is recorded by the light control means 5 while changing the intensity of the recording light e, and the recording condition is determined by the recording condition determining means 3 so that the reproduced signal f obtained by reproducing the signal is optimized (determination of the recording condition). ). Next, a normal recording / reproducing operation was performed while controlling the recording light intensity to be optimum by the light control means 5 based on this determination (normal recording operation).

A third conventional example is disclosed in Japanese Patent Application Laid-Open No. 59-1850.
44, there is an optical memory device. This apparatus has a control beam for performing tracking control and a recording / reproducing beam for recording / reproducing information, and the information recording / reproducing speed is improved by a plurality of light beams.

[0006]

First, in the multi-beam recording / reproducing apparatus disclosed in the third conventional example, the recording condition is determined using the apparatus disclosed in the first or second conventional example. It can be easily analogized.
That is, it is an apparatus that individually determines the recording condition by each of the plurality of light beams. However, the apparatus for determining the recording conditions of the first or second conventional example requires the same number as the number of light beams, and the operation for determining the recording conditions also requires the same number of operations as the number of light beams. In other words, there is a problem that the apparatus configuration becomes excessively large and time is wasted in the process of determining the recording conditions.

[0007]

A multi-beam recording / reproducing apparatus according to the present invention irradiates a recording medium with a plurality of light beams,
In a multi-beam recording / reproducing apparatus for recording / reproducing information, a light beam selecting means for selecting at least one light beam from the plurality of light beams, and recording conditions are not changed.
Meanwhile, the recording control means for irradiating the selected light beam for recording, the recording condition determining means for determining a recording condition from a reproduction signal from the recording medium, and the determined recording condition
Irradiate multiple light beams to record and reproduce information.
Recording / reproducing means .

Further, by irradiating a plurality of light beams on a recording medium, in a multi-beam recording and reproducing apparatus for recording and reproducing information, a reproduction signal selecting means for selecting at least one of the reproduced signals from a plurality of reproduction signals, recorded Do not change the conditions
Recording control means for irradiating the light beam for recording, recording condition determining means for determining recording conditions from the selected reproduction signal from the recording medium ,
Recording information by irradiating multiple light beams under recording conditions
Recording / reproducing means for performing reproduction .

[0009]

According to the multi-beam recording / reproducing apparatus of the present invention,
Select at least one light beam from multiple light beams
And change the recording conditions while changing the selected light beam.
Irradiate and record, and record condition from reproduction signal from recording medium
Is determined, and a plurality of light beams are
To record and reproduce information. Or multiple re-
Select at least one playback signal from the raw signals and record
Record by irradiating light beam while changing the matter, and record
Determine the recording condition from the selected reproduction signal from the medium,
Irradiate multiple light beams under the determined recording conditions
Records and reproduces information.

That is, for each light beam,
It is not necessary to determine the recording conditions, and at least one device for determining the recording conditions may be used, and at least one operation for determining the recording conditions may be performed. In other words, the apparatus configuration can be largely omitted, and the process for determining the recording conditions can be saved in time.

[0011]

1 and 2 show a first embodiment of the present invention.
This will be described with reference to FIG. In FIG. 1, the case when the recording condition is determined will be described first. The light beam selecting means 1 selects at least one light beam from a plurality of light beams. The recording condition signal 6 is transmitted from the recording control unit 2 to the light beam selecting unit 1.
To send out. Then, while changing the recording condition according to the recording condition signal b, the magneto-optical disk 4 as the recording medium is irradiated with the light beam a to record the signal. Note that the recording conditions are not limited to the intensity of the light beam, but the length of the light beam pulse,
The interval and the strength of the external magnetic field may be used. The recording conditions are such that the number of recording tracks is in the range of 1 to 100 (1
(about .mu.m to 100 .mu.m), the recording conditions can be determined by at least one light beam in the usual number of multi-beams (about 2 to 10).

The reproduced signal c obtained by reproducing the recorded signal is inputted to the recording condition determining means 3 to determine the optimum value of the recording condition at which the reproduced signal c becomes the best.

Next, during a normal recording operation, the recording condition d
After the determination operation is completed, a normal recording / reproducing operation is performed by a plurality of light beams while the recording control means 2 controls the recording conditions to be optimal.

FIG. 2 shows a flowchart of the operation of FIG. The light beam selecting means 1 selects at least one light beam from a plurality of light beams (selection of a light beam). The recording condition signal b is sent from the recording control means 2 to the light beam selecting means 1, and while changing the recording condition according to the recording condition signal b, the recording medium is irradiated with the light beam c of the magneto-optical disk 4 as a recording medium to record the signal. The recording condition is not limited to the intensity of the light beam, but may be the length and interval of the light beam pulse, the intensity of the external magnetic field, and the like. The reproduced reproduction signal c is input to the recording condition determining means 3 to determine the optimum value of the recording condition that makes the reproduction signal c the best (determination of the recording condition).

Next, after the end of the recording condition determination operation, a normal recording / reproducing operation is performed by a plurality of light beams while controlling the recording condition to be optimum by the recording control means d (normal multi-beam operation). Recording / playback operation).

The determined recording conditions are stored in, for example, a part of the recording area on the inner circumference of the magneto-optical disk 4, and if the recording conditions are read out from the next time and the recording conditions are controlled, the recording conditions will be renewed. There is no need to determine the conditions.

In the above embodiment, at least one light beam is selected from a plurality of light beams. However, the present invention is not limited to this. For example, without selecting a light beam, recording a plurality of light beams A signal may be recorded while changing the conditions in the same manner, and at least one reproduced signal may be selected from a plurality of reproduced signals. Further, the light reflected from the recording medium is not limited to the reproduction signal, and may be selected.

[0018]

According to the multi-beam recording / reproducing apparatus of the present invention, at least one light beam is formed from a plurality of light beams.
Select the light beam while changing the recording conditions.
Recording by irradiating the recording medium and recording from the reproduction signal from the recording medium
Determine the conditions, and under the determined recording conditions,
The recording and reproduction of information is performed by irradiating a beam. Or multiple
Select at least one playback signal from the playback signals of
While changing the recording conditions, record by irradiating with a light beam,
Determine recording conditions from selected playback signal from recording medium
And irradiates multiple light beams under the determined recording conditions.
To record and reproduce information.

That is, for each light beam,
It is not necessary to determine the recording condition, and at least one device for determining the recording condition may be used in order to substitute at least one light beam or reproduction signal. Further, at least one operation for determining the recording condition may be performed. In other words, the apparatus configuration can be largely omitted, and the time for the process of determining the recording conditions can be saved.

Although the above embodiment has been described with reference to a magneto-optical disk recording / reproducing apparatus as an example, the present invention is not limited to this.
The same effect can be obtained in a recording / reproducing apparatus such as a tape, and a write-once / phase-change optical recording / reproducing apparatus. Also, an example in which the recording condition that maximizes the amplitude of the reproduction signal is determined has been described. However, the present invention is not limited to this, and may be determined based on the width of the reproduction signal waveform.

[Brief description of the drawings]

FIG. 1 is a diagram showing a main part of a multi-beam recording / reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a flowchart of the operation in FIG. 1;

FIG. 3 is a diagram showing a main part of a conventional optical recording / reproducing apparatus.

FIG. 4 is a diagram showing a flowchart of the operation in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Light beam selection means 2 Recording control means 3 Recording condition determination means 4 Magneto-optical disk

Claims (2)

(57) [Claims] A recording medium is irradiated with a plurality of light beams,
In a multi-beam recording / reproducing apparatus for recording / reproducing information, a light beam selecting means for selecting at least one light beam from the plurality of light beams, and changing the selected light beam while changing recording conditions
Irradiation and recording control means for irradiating the recording, the recording condition determining means for determining a recording condition from a reproduced signal from the recording medium, a recording condition determined as described above, a plurality of light beams
And a recording / reproducing means for recording / reproducing information . 2. A method for irradiating a recording medium with a plurality of light beams,
In a multi-beam recording / reproducing apparatus for recording / reproducing information, reproduction signal selecting means for selecting at least one reproduction signal from a plurality of reproduction signals, and recording control for irradiating the light beam and recording while changing recording conditions irradiation means, a recording condition determining means for determining the selected reproduction signal from the recording condition from the recording medium, a recording condition determined as described above, a plurality of light beams
And a recording / reproducing means for recording / reproducing information .