JP3302143B2 - Optical disk cartridge and optical disk device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk device,
In particular, the present invention relates to an optical disk cartridge having an optical disk recording status display function and an optical disk apparatus having a function of displaying the optical disk recording status on the optical disk cartridge.

[0002]

2. Description of the Related Art As is well known, for example, a laser beam output from a semiconductor laser oscillator in an optical head causes
Record information on optical or magneto-optical disks,
Various optical disk devices for reading information recorded on an optical disk or a magneto-optical disk have been developed.

[0003] In a conventional write-once optical disc, information is recorded by piercing a small hole in a recording surface with a laser beam. Therefore, there is a difference in light reflectance between a recorded area and an unrecorded area. Thus, the recording status could be easily determined by human eyes. On the other hand, recently, a rewritable optical disk which records information by changing the direction of magnetism, for example, a magneto-optical disk, has been frequently used.

[0004]

However, since a magneto-optical disk records information only by changing the direction of magnetism, rather than physically making a hole, a recorded area and an unrecorded area are not recorded. Cannot be distinguished by human eyes.

Accordingly, an optical disk of a recording / reproducing method using magneto-optics may be an unused disk, a used disk,
In addition, in order to determine how much more data can be recorded, it is necessary to load a disc into the reproducing apparatus each time.

[0006] Regardless of the write-once type or rewrite type,
The optical disk is usually stored in a cartridge. Therefore, in the case of a write-once optical disc, although the recording state can be easily discriminated by the human eye as described above, actually, it can only be seen through an opening window provided in the cartridge. It was not convenient.

Further, even if a display area for displaying the recording status of the optical disk is provided in the cartridge, special means for rewriting the display content of the display area in accordance with the recording status of the optical disk is required. However, since the configuration of the optical disk device is complicated, it has been difficult to realize this.

Accordingly, the present invention has been made in view of the above points, and provides a display area on an optical disk cartridge so that a recording state can be visually discriminated without requiring special complicated means. It is an object of the present invention to provide a modified optical disk cartridge.

[0009]

[0010]

SUMMARY OF THE INVENTION The present invention provides a phase change device.
A recording layer that, by light irradiation, the recording
An optical disk on which information is recorded in a layer, a cartridge body for housing the optical disk therein, and a phase change formed outside the cartridge body, similar to the optical disk
Recording layer, and the light is irradiated,
The recording layer is changed to a phase-changed state,
Cart with a display area for displaying the recording status
Ridge. Also, the present invention
Information can be recorded on the ridge and the optical disk with a common optical head.
That's what I did.

[0011]

[0012]

[0013]

[0014]

[0015]

The optical disk cartridge according to the present invention having the above-described structure has a display area having a phase change recording layer that changes its phase by light irradiation, and the recording state information of the optical disk can be visually discriminated in this display area. Is displayed.

[0016]

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an optical disk cartridge 101 in which a 3.5-inch type magneto-optical disk 100 is housed, for example.

On the outer surface of the main body of the optical disk cartridge 101, there is provided a recording status display area 102 for recording information on the magneto-optical disk 100 to be stored. In this recording status display area 102, for example, FIGS. 2 (a), (b),
As shown in (c), the recording status of the magneto-optical disk 100 is visually and rewritable, and the erasable status is "40% used" or "60% remaining", or the recorded portion is black and unrecorded. A graphic display with a white part is printed or displayed.

Therefore, when the user wants to know the recording status of the optical disk cartridge 101, the user simply loads the optical disk cartridge 101 without loading it into the reproducing apparatus every time.
It is possible to know this simply by looking at the recording status display area 102 provided at 01.

FIG. 3 shows a specific example of the structure of the recording status display area 102 provided in the optical disk cartridge 101 and printing or displaying of the recording status on the display area 102.

The display area 102 has a reflective film e made of, for example, aluminum, such as Z, on a base material f.
A dielectric layer d made of nSiO2, for example, Ge-Sb-T
The phase change layer c made of e, for example, has a hierarchical structure in which a dielectric layer b made of ZnSiO2 and a protective layer a are laminated.

That is, a part of the display area 12 or
A phase change layer c which enables a reversible change from an amorphous state to a crystalline state or from a crystalline state to an amorphous state by heat applied to the entire surface is formed as a recording film sandwiched between the dielectric layers b and d. A reflective film e for reflecting a part or all of the transmitted light is formed below or above the layer.

That is, the display area 12 is formed of the phase change layer c.
The laser light source (print head) is used as a numerical value or a graph for visually discriminating the recording state of the magneto-optical disk 100 by utilizing the difference in the light reflectance between the crystalline state and the non-crystalline state in the optical disk.
It is characterized by drawing by g.

FIG. 4 shows a specific example of the print head drive unit 103 for driving the laser light source (print head) g. The print head driving unit 103 detects a recording state (recorded / unrecorded area) of the magneto-optical disk 100 stored in the optical disk cartridge 101 separately into a recorded area and an unrecorded area. A recording status calculation unit 105 that calculates the recording status as the remaining capacity based on the detection signal from the recording status detection unit 104; and a display area 102 of the optical disc cartridge 101 based on the calculation signal from the recording status calculation unit 105. The recording status (remaining capacity) display erasing section 106 for erasing the previous recording status when the previous recording status is displayed on the display area 102, and the recording in the display area 102 where the previous recording status has been erased by the recording status display erasing section 106. Based on the calculation signal from the status calculation unit 105, the current recording status is printed as a numerical value indicating the remaining capacity, for example. And a laser printhead g to supply the recording conditions (the remaining capacity) printing unit 107 a drive signal, usually these components are incorporated in the later-described optical disk (recording / reproducing) apparatus.

When the recording status information is obtained from the outside as shown by a broken line in FIG.
04 and the recording status calculation unit 105 may be omitted. That is, when the laser print head g is driven by the print head driving unit 103 according to information to be printed,
Laser print head g to optical disc cartridge 101
Is irradiated with a laser beam.

The display area 102 is generated by this laser beam.
The phase change layer (recording film) c is heated to change from a crystalline state to an amorphous state. Since the portion in the non-crystalline state, that is, the portion corresponding to the information to be printed hardly transmits light, the reflected light from the reflective film e is extremely reduced, and only the portion becomes black as if printed. You will be able to see it.

At the time of erasing, the amount of heat necessary for the phase change layer (recording film) c to change from an amorphous state to a crystalline state may be given by a laser beam from a laser print head g.
Conversely, the portion in the crystalline state easily transmits light, so that the entire display area 102 only looks white as if it had been totally reflected from the reflective film e and had been erased.

In this way, the display area 102 can be rewritten as many times as possible,
If the optical disc drive 3 is built in the optical disc apparatus, the recording status of the magneto-optical disc 100 is updated and recorded according to the use, and the
It is possible to know the latest recording status of the disc simply by looking at the first display area 102.

FIG. 5 shows a specific example of an optical disk device having the above-mentioned drive unit 103 built therein. As described above, the optical disk cartridge 101 containing the magneto-optical disk 100 is loaded at a predetermined position by a loading device (not shown).

The optical head 3 is disposed to face the display area 102 (see FIG. 1) of the optical disk cartridge 101. In this case, the optical head 3 is also used for recording and reproducing information on the magneto-optical disk 100 and for printing the recording status such as the remaining capacity of the magneto-optical disk 100 on the display area 102 of the optical disk cartridge 101.

In the latter case, the optical head 3 is driven by the print head driving unit 103 described above. The operation of printing the recording status such as the remaining capacity of the magneto-optical disk 100 on the display area 102 of the optical disk cartridge 101 by the optical head 3 is performed in the same manner as described above.

On the surface of the magneto-optical disk 100, spiral or concentric grooves (recording tracks) are formed.
The motor 2 rotates at a constant speed, for example.

The motor 2 is controlled by a motor control circuit 18. Recording and reproduction of information with respect to the magneto-optical disk 100 are performed by the magnet M for applying an external magnetic field and the optical head 3.

The optical head 3 is fixed to a drive coil 13 constituting a movable portion of a linear motor 31. The drive coil 13 is connected to a linear motor control circuit 17.

A permanent magnet (not shown) is provided at a fixed portion of the linear motor 31. When the drive coil 13 is excited by the linear motor control circuit 17, the optical head 3 is moved substantially in the radial direction of the magneto-optical disk 100. It is designed to be moved at a constant speed.

An objective lens 6 is held on the optical head 3 by a wire or a leaf spring (not shown). The objective lens 6 is moved in a focusing direction (an optical axis direction of the lens) by a driving coil 5 and is driven. The coil 4 can move in a tracking direction (a direction orthogonal to the optical axis of the lens).

The laser light generated by the semiconductor laser oscillator 9 driven by the laser control circuit 14 is
Collimator lens 11a, half prisms 11b, 11
c, irradiating onto the optical disc 1 via the objective lens 6,
The reflected light from the optical disc 1 is guided to the photodetector 8 via the objective lens 6, the half prism 11c, the condenser lens 10a, and the cylindrical lens 10b.

The photodetector 8 comprises a four-divided photodetection cell 8
a, 8b, 8c and 8d. The output signal of the photodetection cell 8a of the photodetector 8 is an amplifier 12a
Is supplied to one end of the adders 30a and 30c via an amplifier 12b, and the output signal of the photodetection cell 8b is supplied to one end of the adders 30b and 30d via the amplifier 12b.

The output signal of the light detection cell 8c is supplied to the amplifier 12
The output signal of the photodetection cell 8d is supplied to the other ends of the adders 30b and 30c via the input terminal c and the other ends of the adders 30a and 30d via the amplifier 12d.

The output signal of the adder 30a is supplied to the inverting input terminal of the differential amplifier OP1.
Is supplied with the output signal of the adder 30b.

The output signals of the adders 30a and 30b are supplied to an adder 30e. The output signal of the adder 30e is supplied to the signal processing circuit 19. Differential amplifier OP1
Supplies a track difference signal to the tracking control circuit 16 in accordance with the difference between the adders 30a and 30b.

The tracking control circuit 16 creates a track drive signal according to the track difference signal supplied from the differential amplifier OP1. The track drive signal output from the tracking control circuit 16 is supplied to the drive coil 4 in the tracking direction.

The track difference signal used in the tracking control circuit 16 is output to the linear motor control circuit 17.
It is supplied to. The linear motor control circuit 17 applies a voltage corresponding to a moving speed to a drive coil (conductor) 13 in a linear motor 31 described later according to a track difference signal from the tracking control circuit 16 and a movement control signal from the CPU 23. Things.

The linear motor control circuit 17 utilizes an electrical change inside the drive coil 13 which occurs at the moment when the drive coil 13 in the linear motor 31 described later crosses a magnetic flux generated from a magnetic member (not shown). , Drive coil 1
A speed detection circuit (not shown) for detecting the relative speed between the magnetic member 3 and the magnetic member, that is, the moving speed of the linear motor 31 is provided.

The output signal of the adder 30c is supplied to the inverting input terminal of the differential amplifier OP2, and the non-inverting input terminal of the differential amplifier OP2 is supplied with the output signal of the adder 30d.

Thus, the differential amplifier OP2 supplies a signal relating to the focus point to the focusing control circuit 15 according to the difference between the adders 30c and 30d.

The output signal of the focusing control circuit 15 is supplied to the focusing drive coil 5, and the laser beam is controlled so that it is always just focused on the magneto-optical disk 100.

Each of the photodetection cells 8a to 8 of the photodetector 8 in the state where focusing and tracking are performed as described above.
The sum signal of the output signals of d, that is, the output signal from the adder 30e, reflects the change in the reflectance from the pits (recording information) formed on the track.

This signal is supplied to a signal processing circuit 19, which reproduces recorded information and address information (track number, sector number, etc.). Further, a recording signal generation circuit 34 as a modulation circuit for modulating a recording signal is provided at a stage preceding the laser control circuit 14.

The optical disk device has a focusing control circuit 15 and a tracking control circuit 1 respectively.
6. A D / A converter 22 used for exchanging information between the linear motor control circuit 17 and the CPU 23 is provided.

The tracking control circuit 16
The objective lens 6 is moved in response to a track jump signal supplied from the CPU 23 via the D / A converter 22, and the laser beam is moved by one track.

The print head drive unit 103, laser control circuit 14, focusing control circuit 15, tracking control circuit 16, linear motor control circuit 17, motor control circuit 18, signal processing circuit 19, recording signal creation circuit 34, etc. The CPU 23 is controlled via a line 20, and the CPU 23 performs a predetermined operation according to a program stored in a memory 24.

The print head driving unit 103 shown in FIG.
The components (104 to 107) shown in FIG.
The function may be included in U23. next,
The operation of recording information on the magneto-optical disk 100 in such a configuration and the operation of reproducing the recorded information signal will be described.

For example, at the time of recording, it is assumed that the magneto-optical disk 100 is rotated by the motor 2 at a constant speed or a rotation speed corresponding to the spot position focused on the disk.

First, the laser light generated by the semiconductor laser oscillator 9 driven by the laser control circuit 14 is
Half prism 11b via collimator lens 11a
The light is then reflected and guided to the photodetector 33, and the light transmitted through the half prism 11b and guided to the magneto-optical disk 100.

That is, the light reflected by the half prism 11 b is guided to the photodetector 33 via the lens 32.
The electric signal photoelectrically converted by the photodetector 33 is amplified by the amplifier 35 and supplied to the signal processing circuit 19.

The light transmitted through the half prism 11b is reflected by the half prism 11c, condensed by the objective lens 6, and information is recorded on the track of the magneto-optical disk 100 to which an external magnetic field is applied from the magnet M. Is done.

At the time of reproduction, the light reflected from the magneto-optical disk 100 and returned is transmitted through the half prism 11c and guided to the photodetector 8 via the condenser lens 10a and the cylindrical lens 10b.

At the time of reproduction, a polarizer 112 and an analyzer 113 indicated by broken lines are inserted in the optical path of the optical head 3 in order to perform reproduction using the Kerr effect. The outputs of the photodetection cells 8a to 8d constituting the photodetector 8 are amplified by amplifiers 12a, 12b, 12c, and 12d, respectively, and the output signal from the adder 30e, which is the sum signal, is supplied to the signal processing circuit 19. You.

The signal from the photodetector 33 indicates the change in the amount of laser light emitted from the semiconductor laser oscillator 9, and the sum signal from the photodetector 8 indicates the amount of the laser light and the reflection of the magneto-optical disk 100. The rate change can be monitored.

The magneto-optical disk 10 as described above
The optical disk device having a function of visually and rewritably printing the recording status of “0” on the display area 102 of the optical disk cartridge 101 is provided in the signal processing circuit 19 when the user desires and whenever the recording of the information is completed. , CP
The optical head 3 is driven by fetching the recording status information of the magneto-optical disk 100 via U23 and the print head driving unit 103.

Thus, the optical disk cartridge 10
1, the latest recording status is always printed on the display area 102, so that the user can
Display area 102 even if is removed from the optical disk device.
The recording status of the remaining capacity of the magneto-optical disk 100 can be ascertained only by visually observing.

FIG. 6 shows another specific example of an optical disk device incorporating the driving unit 103. As described above, the optical disk cartridge 10 containing the magneto-optical disk 100
1 is loaded at a predetermined position by a loading device (not shown).

The above-described laser print head g is disposed to face the display area 102 (see FIG. 1) of the optical disk cartridge 101. In this case, the laser print head g includes the semiconductor laser oscillator 108 and the collimator lens 1
09, a half prism 110 and an objective lens 111.

The semiconductor laser oscillator 105 of the laser print head g is driven by the print head drive unit 103 described above. The operation of printing the recording status such as the remaining capacity of the magneto-optical disk 100 on the display area 102 of the optical disk cartridge 101 by the laser print head g is performed in the same manner as described above.

On the surface of the magneto-optical disk 100, grooves (recording tracks) are formed spirally or concentrically, and the magneto-optical disk 100 is rotated at a constant speed by the motor 2, for example.

The motor 2 is controlled by a motor control circuit 18. Recording and reproduction of information with respect to the magneto-optical disk 100 are performed by the magnet M for applying an external magnetic field and the optical head 3.

The optical head 3 is fixed to a drive coil 13 constituting a movable portion of a linear motor 31. The drive coil 13 is connected to a linear motor control circuit 17.

The fixed portion of the linear motor 31 is provided with a permanent magnet (not shown). When the drive coil 13 is excited by the linear motor control circuit 17, the optical head 3 moves substantially in the radial direction of the magneto-optical disk 100. It is designed to be moved at a constant speed.

An objective lens 6 is held on the optical head 3 by a wire or a leaf spring (not shown). The objective lens 6 is moved by a drive coil 5 in the focusing direction (the direction of the optical axis of the lens). The coil 4 can move in a tracking direction (a direction orthogonal to the optical axis of the lens).

The laser light generated by the semiconductor laser oscillator 9 driven by the laser control circuit 14 is
Collimator lens 11a, half prisms 11b, 11
c, irradiating onto the optical disc 1 via the objective lens 6,
The reflected light from the optical disc 1 is guided to the photodetector 8 via the objective lens 6, the half prism 11c, the condenser lens 10a, and the cylindrical lens 10b.

The photodetector 8 comprises a four-divided photodetection cell 8
a, 8b, 8c and 8d. The output signal of the photodetection cell 8a of the photodetector 8 is an amplifier 12a
Is supplied to one end of the adders 30a and 30c via an amplifier 12b, and the output signal of the photodetection cell 8b is supplied to one end of the adders 30b and 30d via the amplifier 12b.

The output signal of the photodetection cell 8c is
The output signal of the photodetection cell 8d is supplied to the other ends of the adders 30b and 30c via the input terminal c and the other ends of the adders 30a and 30d via the amplifier 12d.

The output signal of the adder 30a is supplied to the inverting input terminal of the differential amplifier OP1.
Is supplied with the output signal of the adder 30b.

The output signals of the adders 30a and 30b are supplied to an adder 30e. The output signal of the adder 30e is supplied to the signal processing circuit 19. Differential amplifier OP1
Supplies a track difference signal to the tracking control circuit 16 in accordance with the difference between the adders 30a and 30b.

The tracking control circuit 16 creates a track drive signal according to the track difference signal supplied from the differential amplifier OP1. The track drive signal output from the tracking control circuit 16 is supplied to the drive coil 4 in the tracking direction.

The track difference signal used in the tracking control circuit 16 is transmitted to the linear motor control circuit 17.
It is supplied to. The linear motor control circuit 17 applies a voltage corresponding to a moving speed to a drive coil (conductor) 13 in a linear motor 31 described later according to a track difference signal from the tracking control circuit 16 and a movement control signal from the CPU 23. Things.

The linear motor control circuit 17 utilizes an electric change inside the drive coil 13 which occurs at the moment when the drive coil 13 in the linear motor 31 described later crosses a magnetic flux generated from a magnetic member (not shown). , Drive coil 1
A speed detection circuit (not shown) for detecting the relative speed between the magnetic member 3 and the magnetic member, that is, the moving speed of the linear motor 31 is provided.

The output signal of the adder 30c is supplied to the inverting input terminal of the differential amplifier OP2, and the non-inverting input terminal of the differential amplifier OP2 is supplied with the output signal of the adder 30d.

Thus, the differential amplifier OP2 supplies a signal relating to the focus point to the focusing control circuit 15 according to the difference between the adders 30c and 30d.

The output signal of the focusing control circuit 15 is supplied to the focusing drive coil 5 so that the laser beam is controlled so that it is always just focused on the magneto-optical disk 100.

Each of the light detection cells 8a to 8 of the light detector 8 in the state where the focusing and tracking are performed as described above.
The sum signal of the output signals of d, that is, the output signal from the adder 30e, reflects the change in the reflectance from the pits (recording information) formed on the track.

This signal is supplied to a signal processing circuit 19, which reproduces recorded information and address information (track number, sector number, etc.). Further, a recording signal generation circuit 34 as a modulation circuit for modulating a recording signal is provided at a stage preceding the laser control circuit 14.

The optical disk device has a focusing control circuit 15 and a tracking control circuit 1 respectively.
6. A D / A converter 22 used for exchanging information between the linear motor control circuit 17 and the CPU 23 is provided.

The tracking control circuit 16
The objective lens 6 is moved in response to a track jump signal supplied from the CPU 23 via the D / A converter 22, and the laser beam is moved by one track.

The print head driving unit 103, laser control circuit 14, focusing control circuit 15, tracking control circuit 16, linear motor control circuit 17, motor control circuit 18, signal processing circuit 19, recording signal creation circuit 34, etc. The CPU 23 is controlled via a line 20, and the CPU 23 performs a predetermined operation according to a program stored in a memory 24.

The print head driving unit 103 shown in FIG.
The components (104 to 107) shown in FIG.
The function may be included in U23. next,
The operation of recording information on the magneto-optical disk 100 in such a configuration and the operation of reproducing the recorded information signal will be described.

For example, at the time of recording, it is assumed that the magneto-optical disk 100 is rotated by the motor 2 at a constant speed or at a rotation speed corresponding to the spot position focused on the disk.

First, the laser light generated by the semiconductor laser oscillator 9 driven by the laser control circuit 14 is
Half prism 11b via collimator lens 11a
The light is then reflected and guided to the photodetector 33, and the light transmitted through the half prism 11b and guided to the magneto-optical disk 100.

That is, the light reflected by the half prism 11b is guided to the photodetector 33 via the lens 32.
The electric signal photoelectrically converted by the photodetector 33 is amplified by the amplifier 35 and supplied to the signal processing circuit 19.

The light transmitted through the half prism 11b is reflected by the half prism 11c, collected by the objective lens 6, and information is recorded on the track of the magneto-optical disk 100 to which an external magnetic field is applied from the magnet M. Is done.

At the time of reproduction, the light reflected and returned from the magneto-optical disk 100 passes through the half prism 11c and is guided to the photodetector 8 via the condenser lens 10a and the cylindrical lens 10b.

At the time of reproduction, a polarizer 112 and an analyzer 113 indicated by broken lines in the drawing are inserted into the optical path of the optical head 3 in order to perform reproduction using the Kerr effect. The outputs of the photodetection cells 8a to 8d constituting the photodetector 8 are amplified by amplifiers 12a, 12b, 12c, and 12d, respectively, and the output signal from the adder 30e, which is the sum signal, is supplied to the signal processing circuit 19. You.

The signal from the photodetector 33 indicates the change in the amount of laser light emitted from the semiconductor laser oscillator 9, and the sum signal from the photodetector 8 indicates the amount of the laser light and the reflection of the magneto-optical disk 100. The rate change can be monitored.

The above-described magneto-optical disk 10
The optical disk device having a function of visually and rewritably printing the recording status of “0” on the display area 102 of the optical disk cartridge 101 is provided in the signal processing circuit 19 when the user desires and whenever the recording of the information is completed. , CP
The recording state information of the magneto-optical disk 100 is taken in via the U23 and the print head driving unit 103, and the laser print head g is driven.

Thus, the optical disk cartridge 10
1, the latest recording status is always printed in the display area 102, so that the user can
Display area 102 even if is removed from the optical disk device.
The recording status of the remaining capacity of the magneto-optical disk 100 can be ascertained only by visually observing.

[0097]

Therefore, as described in detail above, according to the present invention, a display area is provided on an optical disk cartridge, and a recording state is displayed without requiring any special complicated means. It is possible to provide an optical disk cartridge that can be distinguished.

Further, according to the present invention, an optical disk apparatus having a function of displaying the recording state of an optical disk in the above-mentioned display area of the optical disk cartridge so that it can be visually discriminated without requiring special complicated means. Can be provided.

[Brief description of the drawings]

FIG. 1 is a front view showing an optical disk cartridge according to the present invention.

FIG. 2 is a view showing an example of printing on a display area of the optical disk cartridge of FIG. 1;

FIG. 3 is a view exemplifying a structure of a display area in FIG. 1;

FIG. 4 is a block diagram illustrating a configuration of a laser print head driving unit in FIG. 3;

FIG. 5 is a block diagram showing a configuration of an optical disk device according to the present invention.

FIG. 6 is a block diagram showing another configuration of the optical disc device according to the present invention.

[Explanation of symbols]

Reference numeral 100: magneto-optical disk, 101: optical disk cartridge, 102: recording status display area, 103: print head drive unit, 104: recording status (recorded / unrecorded area) detection unit, 105: recording status (remaining capacity) calculation unit , Recording status (remaining capacity) display erasing section, recording status (remaining capacity) printing section, a: protective layer, b: dielectric layer, c: phase change layer, d: dielectric layer, e: reflective film, f: Base substrate, g laser print head, 108 semiconductor laser oscillator, 109 collimator lens, 110 half prism, 111 objective lens, 112 polarizer, 113 analyzer, 3 optical head, 14 laser control Circuit, 34 ... a recording signal creation circuit,
15 Focusing control circuit, 16 Tracking control circuit, 17 Linear motor control circuit, 18 Motor control circuit, 19 Signal processing circuit, 31 Linear motor, 2
2 ... D / A converter, 23 ... CPU, 24 ... Memory.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B 23/40 G11B 11/105 G11B 23/30

Claims (4)

(57) [Claims] 1. An optical disc having a phase-change recording layer , wherein information is recorded on the recording layer by irradiating light, a cartridge main body for housing the optical disc inside, and an optical disc outside the cartridge main body. Formed and the optical disc
A recording layer that changes phase similarly to the
By doing so, the recording layer as a phase-changed state,
An optical disc cartridge comprising: a display area for displaying recording information on the optical disc. Respect 2. A disk, an optical disc apparatus for recording by irradiating the optical information, comprising a recording layer that changes phase, by light irradiation,
And the optical disk in which information in the recording layer is recorded, a cartridge body housing the optical disk therein, is formed on the outside of the cartridge body, the optical disc
A recording layer that changes phase similarly to the
By doing so, the recording layer as a phase-changed state,
A display area for displaying recording information relating to the optical disc; and a display area for selectively displaying both the display area and the optical disc.
And an optical head for irradiating a beam to the
Optical disk device that. Respect 3. A disc, an optical disc apparatus for recording by irradiating the optical information, comprising a recording layer that changes phase, by light irradiation,
And the optical disk in which information in the recording layer is recorded, a cartridge body housing the optical disk therein, is formed on the outside of the cartridge body, the optical disc
A recording layer that changes phase similarly to the
By doing so, the recording layer as a phase-changed state,
A display area for displaying recording information relating to the optical disc; and a display area for selectively displaying both the display area and the optical disc.
Corresponding to an optical head for irradiating a light beam, a recording state detection means for detecting the recorded information of the optical disc, the recording information detected by the recording state detection means
Irradiating the display area with the laser beam of the optical head
An optical disk device comprising: 4. Recorded information recorded in the display area
Is information recorded on the optical disk.
4. The optical disk device according to claim 1, wherein: