JPS61239448A - Method for recording information of optical information recording and reproducing device - Google Patents

Abstract

PURPOSE:To record information in a short time by erasing the information stored in a projected and recessed part of a recording medium by a light beam emitted from either one of both light sources and at the same time recording the information to the other projection or recessed part of the recording medium by a light beam emitted from the other light source. CONSTITUTION:An optical head 11 contains semiconductor lasers 13 and 15 as light sources. When the switches of switch circuits 35 and 73 are set as shown by solid lines by the switch signal sent from a control part 45, a laser driver 31 turns on and off the laser 13 in response to the signal supplied from outside via a signal processing circuit 39. Then a track C of a recording medium 1 is recorded by a light beam A emitted from the laser 13. An erasion signal is supplied to a laser driver 33 from the part 45, and the laser 15 emits a light beam B of a fixed level of power. The magnetic fields are arranged on a track D of the medium 1 along a fixed direction of a bias magnetic field.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an information recording method for an optical information recording/reproducing device that can perform recording and erasing simultaneously.

[Conventional technology]

2. Description of the Related Art Conventionally, in erasable optical information recording/reproducing devices such as magneto-optical disk devices, there is a method for recording by irradiating a recording medium with modulated Raded light.

[Problems with conventional technology]

However, in order to record on a recording medium using the above method, it is necessary to rotate the recording medium once to erase a predetermined area, then rotate the recording medium once more and record in the area where the information was erased. Met.

Therefore, there is a problem in that it is necessary to rotate the recording medium at least twice to perform recording, which takes time.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide an information recording method for an optical information recording/reproducing apparatus that can record information in a short time in order to solve the above-mentioned problems.

[Summary of the invention]

In order to achieve the above object, the present invention provides at least two light sources, and allows information stored in either the convex part or the concave part of a recording medium having a pre-group consisting of a convex part and a concave part to be emitted from one of the light sources. The information is erased by a light beam emitted from the recording medium, and at the same time information is recorded on the other of the convex portion or concave portion of the recording medium by a light beam emitted from the remaining light source.

[Embodiments of the invention]

Embodiments of the present invention will be described in detail below based on the drawings.

FIG. 1 is a block diagram showing the configuration of an optical information recording and reproducing device according to an embodiment of the present invention. This optical information recording and reproducing device has two light sources, and one light source emits light. While recording is being performed on a recording medium using a light beam, the recording medium is erased using a light beam emitted from the other light source.

As shown in the figure, the recording medium 1 is attached to the spindle 3.
is rotated in the Q direction by In this recording medium IIC, as shown in FIG. 2, a pre-group consisting of a convex portion 5 and a concave portion 7 is formed, and one track 9 is formed by adjacent convex portions 5 and concave portions 7. Below, the convex part 5 is
1 recess 7.

Let it be D.

Light 5. 11 is a drive device (not shown) and a recording medium 10.
Semiconductor radars 13, 15 as two light sources, which are movable in the radial direction RK, and lenses x''l'y.

19, reflecting mirrors 21 and 23, a half mirror 25, an objective lens, 1e27, and a sensor 29. Semiconductor laser 13. ．． The light beams emitted from 15 have different oscillation wavelengths.

The reflecting mirror 23 has the property of transmitting the light beam emitted from the semiconductor radar 13 but reflecting the light beam B emitted from the semiconductor radar 15, and is also a half mirror.
25 has a characteristic that the light beams A and B emitted from the semiconductor radars 13 and 15 are transmitted, but the respective light beams reflected by the recording medium 1 are reflected.

The light beam A emitted from the semiconductor radar 13 passes through the lens 1
7, reflected by the reflecting mirror 21, and reflected by the reflecting mirror 23.
, passes through the half mirror 25 and is irradiated onto the recording medium 1 by the objective lens 27, and the reflected light is reflected again by the objective lens 2.
7 and is reflected by the half mirror 25 and detected by the sensor 29.

The light beam B emitted from the semiconductor laser 15 passes through the lens 1
9, reflected by the reflecting mirror 23, and reflected by the half mirror 2.
5 and is irradiated onto the recording medium 1 by the objective lens 27.
The reflected light passes through the objective lens 27 again to the half mirror.
25 and detected by a sensor 29.

Light beams A and B emitted from semiconductor radar 13.15
As shown in FIG.
The light beam B is irradiated onto the track D.

The objective lens 27 can be moved in the R direction for tracking, and in the T direction perpendicular to the recording medium 1 for focusing.

The radar drivers 31 and 33 are semiconductor radar drivers 13 and 13, respectively.
The input signal is switched to either a recording signal or an erasing signal by a switch circuit 35.

The sensor 29 is connected to a reproduction signal processing circuit 37. The detailed configuration of this sensor 29 and reproduction signal processing circuit 37 will be described later.

The signal processing circuit 39 is an interface between the outside and this information recording/reproducing device.

The bias magnet 41 located opposite the objective lens 27 with the recording medium 1 in between is not an electromagnet, but is movable in the radial direction RK, and the direction of its magnetic field can be changed in response to a signal sent from the bias magnet driver 43.

The control section 45 emits timing signals to control signals of each section.

FIG. 3 shows the above-mentioned sensor 29 and reproduction signal processing circuit 37.
FIG.

The sensor 29 consists of a 4-split photodetector 47.49.The reproduced signal processing circuit 37 includes adders 5x, ss, and ss.

57.59, 61, 63.65, a subtracter 67.69°71, and a switching circuit 73.

The 4-split photodetector 47 converts the received light into an electrical signal, and combines the signals of the areas Al and A2 with the signal added by the adder 53 and the area A3. The difference between the signal A4 and the signal added by the adder 51 is obtained by the subtracter 67, and this signal becomes the tiger and king signal TR.

Further, the signal obtained by adding the signals of the areas AI and A4 by the adder 55 and the signal of the area A2 . The difference signal between the signal A3 and the signal added by the adder 57 is taken by the subtracter, and this signal is used as the beam person's focus signal FOA and the terminal 75 of the switching circuit 73.
is input. Also, the output signals of adders 55 and 57 are added by adder 63, and this is the reproduced signal R& by light beam A.
It is input to the terminal 77 of the low switching circuit 73.

The 4-split photodetector 49 is the same as the 4-split photodetector 4, and has a signal obtained by adding the signals of areas Bl and B4 in an adder 59 and a signal obtained by adding the signals of areas B2 and B3 in an adder 61. A subtracter 71 takes a difference signal between the light beam B and
The focus signal FOR and the terminal 79 of the switching circuit 73
is input.

Further, the sum signal of the output signals of the adders 59 and 61 is obtained by the adder 65, and this signal is inputted as the reproduced signal RIB by the light beam B to the terminal 81 of the switching circuit 73.

The switching circuit 73 simultaneously switches the switches 83 and 85 in response to the switching signal CO sent from the control unit 45 to switch the focus signal FO and reproduction signal RIC between the light beam A and the light beam B. .

This switching signal CO is also input to the switch circuit 35, and this switching signal CO switches off the connection between the switch 87 and the terminals 91 and 93 in the switch circuit 35, and the connection between the switch 89 and the terminals 95 and 97. Change.

Next, the operation of this embodiment will be explained. The switch circuit 35 and the switch circuit 7 are switched by the switch signal CO from the control section 45.
When each switch 3 is in the state shown by the solid line in FIGS. 1 and 3, the radar driver 31 turns on and off the semiconductor radar 13 in response to a signal input from the outside via the signal processing circuit 39. Recording is performed on the recording medium 1 by a light beam emitted from the radar 13. Then, an erasure signal is inputted to the radar driver 33 from the control unit 45, and the semiconductor radar 15 emits a light beam B of a constant number, and the magnetic field is oriented in a constant direction according to the direction of the bias magnetic field. are aligned, and the tiger and riD are erased.

At this time, the switches 83 and 85 of the switching circuit 73 of the reproduced signal processing circuit 37 are set to the positions indicated by the solid lines in FIG. Become.

That is, the focus signal FOA and the reproduction signal REA by the recording light beam A are selected.

On the other hand, when the switching signal CO from the control unit 45 is switched and the switches of the switch circuit 35 and the switch circuit 73 are switched to the positions shown by the dotted lines in FIGS. 1 and 3, the semiconductor radar 1
Erasing of the light beam Afr-f' emitted from the recording medium 1 is performed, and recording is performed on the track D of the recording medium 1 by the light beam BK emitted from the semiconductor radar 15.

At this time, the focus signal yo and the playback signal Rg of the playback signal processing circuit 37 are the focus signal FO by the light beam B.
R and a reproduced signal REB.

Therefore, no matter which way the switch circuit 35 or the switch circuit 73 is switched, a focus signal can be obtained by the recording light beam.

FIG. 4 is a plan view of the recording area of the recording medium 1.

As shown in the figure, tracks 9 are provided in the radial direction R of the recording medium I, sectors 99 are provided in the circumferential direction S, and data is recorded in the shaded areas.

Therefore, data is recorded in the area where the track number is n and the sector number is m, and in order to rewrite the data in this area, the semiconductor radar 13 records and the semiconductor radar 15 erases. Yo.

At the same time as controlling the switching signal 4co of the control unit 45, the bias magnetic field by the bias magnet 41 is also switched. However, when this area is scanned with the light beams A and B,
Recording is performed on the disk C by the light beam A, and at the same time, erasing is performed on the disk and the disk D by the light beam B&C, and this recording and erasing operation is performed at the same time as the recording medium 101 rotates.

In this embodiment, since the current flowing through the bias magnet 41 is reversed when recording the trough C and when recording the trough D, the respective magnetization directions are opposite.

Also, in track C and track D, the recording signal is “1” and “0”.
The magnetization direction of # is also shown as opposite.

As explained above, since recording and erasing can be performed simultaneously when the recording medium is rotated once, the processing time can be shortened.

In this embodiment, a tracking signal from light beam A was used, but is this a light beam? -Music BK may also be used.

〔Effect of the invention〕

As described above in detail, according to this invention, information can be recorded on a recording medium in a short time.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the optical information recording and reproducing device, Fig. 2 is an enlarged perspective view of the recording medium, Fig. 3 is a circuit diagram of the sensor and reproduction signal processing circuit, and Fig. 4 is a block diagram of the recording medium. It is a schematic diagram. DESCRIPTION OF SYMBOLS 1... Recording medium, 5... Convex part, 7... Concave part, 13
... Semiconductor lede, 15... Semiconductor lede. Agent Patent Attorney Jo Taira Yamashita Figure 1 Figure 2 L) C; DCD

Claims (3)

[Claims] (1) At least two light sources are provided, and information stored in either the convex part or the concave part of a recording medium having a pre-group consisting of a convex part and a concave part is erased by a light beam emitted from the one light source, An information recording method for an optical information recording/reproducing apparatus, characterized in that information is simultaneously recorded on the other of the convex portion or the concave portion of the recording body using a light beam emitted from the remaining light source. (2) An information recording method for an optical information recording/reproducing apparatus according to claim 1, wherein tracking control is performed using one of the light beams emitted from the light source. (3) An information recording method for an optical information recording/reproducing apparatus according to claim 1, characterized in that focus control is performed using a light beam for recording.