JPH07296447A - Recording medium and recording and reproducing device - Google Patents

Abstract

PURPOSE:To obtain a recording medium of a disk type, etc., capable of effectively utilizing advantages of both of a magneto-optical disk and a magnetic disk and overcoming the respective disadvantages thereof and a recording and reproducing device formed by using this recording medium. CONSTITUTION:A first dielectric film 2, a magneto-optical recording film 3, a second dielectric film 4 and a reflection film 5 are successively laminated and formed by a vacuum thin film forming means, such as sputtering method, on one front surface 1a of a transparent substrate 1. Further, a protective film 6 is formed by a wet process coating method, such as spin coating, on the surface of the reflection film 5. On the other hand, a magneto-optical recording film 7 is formed by a vacuum thin film forming means, such as sputtering means, on the other front surface 1b of the transparent substrate 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium and a recording / reproducing apparatus, and more particularly to a disc type recording medium used in electronic cameras, personal computers, workstations and the like, and recording / reproducing using the recording medium. Regarding the device.

[0002]

2. Description of the Related Art In recent years, as a video input / output device for converting a video (image) into electrical information and inputting / outputting it, a video input device such as an electronic still camera for still images or a video camera for moving images is used. Output devices are becoming popular.

Magnetic recording media such as video floppy disks and magnetic tapes are generally used as recording media for these video input / output devices. Furthermore, recently, software compatible with multimedia that handles moving images has begun to spread even in personal computers, and in such fields, magneto-optical disks, hard disks (magnetic disks), etc. are used as recording media.

The recording medium is required to have a large capacity, a compact size, and a low price in order to cope with digitization, high definition, and high image quality, and both the magnetic recording medium and the magneto-optical recording medium are required. , Energetic research and development are underway.

The applicant of the present application can input both still images (including continuous shooting) and moving images as a video (image) input / output device compatible with the next-generation multimedia, and can perform image processing by a computer. We are researching and developing a new system that can be edited and printed out as needed.

As a recording medium used in these video input / output devices, however, a large capacity (for example, storage capacity) capable of inputting several tens or more still images with good image quality and a moving image for about 20 minutes. It is desirable that the size of the recording medium be small (about 50 MB to 500 MB), replaceable (removable) and inexpensive. As a recording medium that can meet such demands, for example, a magneto-optical disk or a removable hard disk having a diameter of 2 inches or less can be considered. . That is, the video floppy disk used in the conventional electronic still cameras,
Since the storage capacity is only about 1MB and the capacity is insufficient,
It is considered desirable to use a small-diameter (for example, 2 inches or less) magneto-optical disk or a removable valve hard disk.

On the other hand, a conventional workstation has a central CPU, a cache memory such as a RAM drive for accumulating frequently used data in the CPU, a fixed magnetic recording device having a hard disk built therein, and an optical disk. The main component is a magneto-optical recording device having a built-in magnetic disk, and the fixed magnetic recording device and the magneto-optical recording device are both connected to the CPU via an interface.

The magneto-optical disk is used as a high-capacity recording medium having high reliability, and is mainly used as a data server of the above-mentioned workstation that handles a large amount of data. Further, it is expected that the magneto-optical disk will be used in a wider range of applications such as supplying application software and starting up a personal environment in the future. Among the application software, those that handle moving images have recently become widespread, and in the future, it is expected that the use of editing videos (moving images and still images) on computers will increase.

[0009]

As described above, a magneto-optical disk or a removable hard disk is considered as a recording medium suitable for a new memory system compatible with the next-generation multimedia. , Especially the write transfer rate is 150 kbps
The transfer rate of the magnetic disk (about 600 kb
However, there is a problem that the transfer rate is slow when used as a recording medium of a video input / output device.

In the magneto-optical disk, the average seek time (time until the head is moved to a predetermined position on the disk) is about 40 to 130 msec, and the average seek time of the hard disk (magnetic disk) (about 20 m).
sec), the processing speed is slower than that of sec.), and therefore, in the workstation, both the magneto-optical disk and the hard disk (magnetic disk) must necessarily be used together to increase the processing speed. That is, in the conventional workstation, as described above, both the magneto-optical recording device and the fixed magnetic recording device are required, which causes a problem that the device becomes large and the cost is increased.

On the other hand, a hard disk (magnetic disk)
However, there is a problem that it is not suitable for supplying software, because duplication of application software becomes expensive.

The present invention has been made in view of the above-mentioned problems, and is a recording medium and recording / reproducing capable of utilizing the advantages of both the magneto-optical disk and the magnetic disk and overcoming their respective drawbacks. The purpose is to provide a device.

[0013]

In order to achieve the above object, a recording medium according to the present invention comprises a magneto-optical recording film for recording / reproducing by magneto-optical and a magnetic recording film for recording / reproducing by magnetic. It is characterized by having.

Specifically, in a first recording medium according to the present invention, the magneto-optical recording film is formed on one surface of a substrate and the magnetic recording film is formed on the other surface of the substrate. It is characterized by being formed.

Further, the magneto-optical recording film is formed on one surface of the substrate via the first dielectric film, and the second dielectric film is further formed on the surface of the magneto-optical recording film. The reflective film and the protective film are sequentially laminated on the surface of the second dielectric film.

It is also preferable that the magneto-optical recording film includes an adjusting layer.

In the second recording medium according to the present invention, the magneto-optical recording film is formed on one surface of the substrate, and the magnetic recording film is further formed on the surface of the magneto-optical recording film. It is characterized by that.

Further, the magneto-optical recording film is formed on one surface of the substrate via the first dielectric film, and
A second dielectric film, a reflective film, and a base film are sequentially interposed between the magneto-optical recording film and the magnetic recording film, and a protective film and a lubricating film are sequentially stacked on the surface of the base film. It is characterized by

Further, in a third recording medium according to the present invention, the magneto-optical recording film is formed on one surface of the first substrate, and on the surface of the magneto-optical recording film via an adhesive layer. To the second
Substrate is formed, and the magnetic recording film is further formed on the surface of the second substrate.

Further, the magneto-optical recording film is formed on one surface of the first substrate via the first dielectric film, and the space between the first dielectric film and the adhesive layer is formed. And a protective film and a lubricating film are sequentially laminated on the surface of the magnetic recording film.

Further, the recording / reproducing apparatus according to the present invention comprises a recording medium integrally formed with a magneto-optical recording film for recording / reproducing by magneto-magnetism and a magnetic recording film for recording / reproducing by magnetism. It is characterized by

Specifically, in the recording / reproducing apparatus, the optical head and the first magnetic head are arranged on one surface side of the recording medium, and the second head is formed on the other surface side of the recording medium.
The magnetic head of FIG.

Further, instead of the recording / reproducing apparatus, an optical head and a magnetic head may be provided on one surface side of the recording medium, and further, one surface side of the recording medium. The optical head may be disposed in the optical recording medium, and the composite magnetic head may be disposed on the other surface side of the recording medium.

It is also preferable that a plurality of the recording media are built-in. Next, the configurations of the recording medium and the recording / reproducing apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view of an essential part of a first recording medium according to the present invention.

Reference numeral 1 denotes a transparent substrate, which is made of a transparent material such as polycarbonate, polyolefin or glass,
Predetermined pits and grooves are formed on one upper surface 1a of the transparent substrate 1, and predetermined texture is formed on the other upper surface 1b. The plate thickness of the transparent substrate 1 is 0.6 to
The thickness of 1.2 mm, preferably 0.6 mm is used.

A first dielectric film 2 is formed on one upper surface 1a of the transparent substrate 1 by vacuum thin film forming means such as sputtering. As the first dielectric film 2, Si is used.
N, AlN, Y ₂ O ₃ or the like is used, and the film thickness is 0.0
The thickness is 3 to 0.2 μm, preferably 0.05 to 0.1 μm.

The magneto-optical recording film 3 is formed on the surface of the first dielectric film 2 by vacuum thin film forming means such as sputtering. The magneto-optical recording film 3 is made of TbFeCo, GdTbF having high coercive force and low Curie point.
A single layer film or a multilayer film containing either e or GdFeCo is used, and the film thickness thereof is formed to 0.03 to 0.2 μm, preferably 0.05 to 0.1 μm. The magneto-optical recording film 3 may be either a magnetic field modulation type or an optical modulation type, but considering the size of the device, the optical modulation type is advantageous because it can be made more compact. Incidentally, the above-mentioned G
dTbFe acts as an adjustment layer, and GdTbFe
When is included, the recording on the magneto-optical recording film 3 is performed by the optical modulation method, and when not included, the magnetic field modulation method is performed.

A second dielectric film 4 is formed on the surface of the magneto-optical recording film 3 by the same method as that for the first dielectric film 2.

A reflective film 5 is formed on the surface of the second dielectric film 4 by vacuum thin film forming means such as sputtering. Al, Cu, Ag or the like is used as the reflection film 5, and the film thickness thereof is 0.02 to 0.1 μm, preferably
The thickness is 0.03 to 0.08 μm.

A protective film 6 is formed on the surface of the reflective film 5 by a wet coating method such as spin coating. As the protective film 6, a general organic polymer material is used, and it is particularly preferable to use an acrylic ultraviolet curable resin. The thickness of the protective film 6 is 1 to 20 μm, preferably 8 to 12 μm. Incidentally, in the present recording medium, the reflective film 5 and the protective film 6 are unnecessary in terms of characteristics,
In consideration of durability, the reflective film 5 and the protective film 6 are laminated on the surface of the magnetic recording film 3.

On the other hand, the magnetic recording film 7 is formed on the other upper surface 1b of the transparent substrate 1 by vacuum thin film forming means such as sputtering. As the magnetic recording film 7, Co-containing γ-Fe ₂ O ₃ having a low coercive force and a high Curie point is used.
Alternatively, a so-called coating type magnetic film in which a magnetic powder such as Ba ferrite is contained in a binder and coated is used. The magnetic recording film 6 may be a single layer or a multilayer, and may be formed on the surface of the base film after forming a predetermined base film. The thickness of the magnetic recording film 7 is 0.03 μm in order to ensure transparency.
˜5 μm, preferably 0.05 to 2.0 μm.

FIG. 2 is a cross-sectional view of an essential part of the second recording medium according to the present invention.

In the second recording medium, the first dielectric film 2, the magneto-optical recording film 3 and the second magnetic recording film 3 are formed on the upper surface 1a of the transparent substrate 1 by the same procedure as the first recording medium. Dielectric film 4
And the reflective film 5 are sequentially stacked.

Thus, the base film 8 is formed on the surface of the reflective film 5 by the plating method. The base film 8 is made of Ni
P is used, and the film thickness thereof is 1 to 30 μm, preferably 10 to 15 μm.

The magnetic recording film 7 is formed on the surface of the base film 8 by a vacuum thin film forming means such as a sputtering method.
As the magnetic recording film, a metal thin film type magnetic film formed by plating or vacuum forming an alloy thin film containing Fe, Co, or Ni as a main component and having a low coercive force and a high Curie point is used. A protective film 9 is laminated on the surface of the magnetic recording film 7 by a vacuum thin film forming means such as a sputtering method as in the case of the first recording medium described above. The magnetic recording film 6
May be a single layer or a multi-layer, and may be formed on the surface of the undercoating film after forming a predetermined undercoating film, and its film thickness is 0.
03 μm to 5 μm, preferably 0.05 to 2.0 μm
Is formed. The protective film 9 is made of carbon, SiO ₂ , Al ₂
O ₃ , BN, Co oxide or the like is used, which may be a single layer film, a multilayer film or a composite film, and the thickness thereof is 0.005
To 0.08 μm, preferably 0.01 to 0.025 μm
formed in m.

The lubricating film 10 is formed on the surface of the protective film 9 by a wet coating method such as spin coating. The lubricating film 10 may be a commonly used polymer material such as fluorine-based, fatty acid-based, or Si-based material, and the film thickness thereof is 0.00
02-0.01 μm, preferably 0.001-0.0
It is formed to have a thickness of 05 μm.

FIG. 3 is a cross-sectional view of essential parts of a third recording medium according to the present invention.

In the third recording medium, the first dielectric film 2, the magneto-optical recording film 3, and the first magneto-optical recording film 3 are formed on one surface 1a of the transparent substrate 1 in the same procedure as the first and second recording media. The second dielectric film 4 and the reflective film 5 are sequentially stacked.

An adhesive layer 11 is applied to the surface of the reflective film 5. The adhesive layer 11 is made of a thermoplastic resin such as polyethylene and has a thickness of 50 μm.

The transparent substrate 12 made of the above-mentioned glass material or the like is adhered to the surface of the adhesive layer 11. The transparent substrate 12
A predetermined texture process is applied to the surface 1c of the.

On the surface of the transparent substrate 12, the magnetic recording film 7, the protective film 9 and the lubricating film 10 are sequentially laminated in the same procedure as in the second recording medium.

FIG. 4 is a conceptual diagram schematically showing a main part of the recording / reproducing apparatus according to the present invention, and shows a case where the recording / reproducing apparatus is constructed by using the above-mentioned first recording medium. .

That is, the recording / reproducing apparatus is arranged on the first recording medium 20 and one surface side (the surface side on which the magneto-optical recording film 3 is formed) of the first recording medium 20. A first magnetic head 21, an optical head 22 and a second magnetic head 23 arranged on the other surface side of the first recording medium 20 (the surface side on which the magnetic recording film 7 is formed) are provided. I have it. The first magnetic head 21 can be omitted when the optical modulation method is adopted.

FIG. 5 is a conceptual diagram showing a case where a recording / reproducing apparatus is constructed by using the above-mentioned second or third recording medium, and the recording / reproducing apparatus is the second or third recording medium. Two
4, 25 and a composite magnetic head disposed on one surface side (the surface side on which the magneto-optical recording film 3 and the magnetic recording film 7 are formed) of the second or third recording medium 24, 25. 26, and an optical head 27 disposed on the other surface of the second or third recording medium 24, 25 (on the surface of the transparent substrate 1).

That is, in FIG. 5, since the magneto-optical recording film 3 and the magnetic recording film 7 are formed on the same surface side with respect to the transparent substrate 1, the so-called composite type magnetic recording and magneto-optical recording. The head 26 is used. Even in such a case, it goes without saying that a magnetic head dedicated to magneto-optical recording and a magnetic head dedicated to magnetic recording may be separately provided.

A plurality of recording media of the present invention (first to third recording media 20, 24, 25) may be present in the device, as in the existing hard disk. In this case, the optical head is used. And a plurality of magnetic heads.

[0048]

According to the above recording medium, when a high transfer rate is required at the time of recording, for example, when recording an image with an electronic camera, the transfer rate is increased by recording an image using the magnetic recording film 7. Can be fast. And
After that, data can be transferred to the magneto-optical recording film 3 via an interface (not shown) as required.

Further, frequently used data may be transferred from the magneto-optical recording film 3 to the magnetic recording film 7 through the interface. When random accessibility is required, information may be taken out from the magneto-optical recording film 3. Any of these recording films can be selected through the interface according to the application. Furthermore, for soft information, part or all of the magneto-optical recording film 3 can be used as a ROM section.

In the recording / reproducing apparatus, when recording / erasing is performed on the magneto-optical recording film 3, it is lower than the Curie point of the magnetic recording film 7 and higher than the Curie point of the magneto-optical recording film 3. Laser light is emitted from the optical heads 22, 27 to the first to third recording media 20, 24, 25 at a temperature, and a magnetic field is applied by the second magnetic head 23 or the composite magnetic head 26.

On the other hand, when performing recording / erasing on the magnetic recording film 7, a magnetic field smaller than the coercive force of the magneto-optical recording film 3 and exceeding the coercive force of the magnetic recording film 7 at room temperature is the first magnetic head. 21 is applied.

The information recorded on the magneto-optical recording film 3 is read by the pickup of the optical heads 22 and 27, and the information stored on the magnetic recording film 7 is read by the second magnetic head 23 or the composite magnetic head. It is read out by 26 and reproduced.

[0053]

EXAMPLES A recording medium and a recording / reproducing apparatus according to the present invention will be specifically described below with reference to examples.

[Embodiment 1] First as a first recording medium
An embodiment of the disk type recording medium will be described with reference to FIG. 1 again.

First, the diameter is 1.8 inches and the plate thickness is 0.6 mm.
A glass substrate as the transparent substrate 1 is prepared. It should be noted that predetermined pits and grooves are formed in advance on one surface 1a of the transparent substrate 1 (on which the magneto-optical recording film 3 is formed).
A predetermined texture is formed in advance on the other surface 1b (where the magnetic recording film 7 is formed).

Then, a SiN film having a film thickness of 0.1 μm is formed as the first dielectric film 2 on one surface 1a of the transparent substrate 1 by the sputtering method. Next, GdFeCo and TbFeC are formed as a magneto-optical recording film 3 on the surface of the first dielectric film 2.
After forming a laminated film of 0.08 μm in thickness by sputtering, a SiN film having a thickness of 0.05 μm as the second dielectric film 4 and a film thickness of 0.06 as the reflective film 5.
A μm Al film is sequentially formed by a sputtering method. Subsequently, an acrylic ultraviolet curable resin film having a film thickness of 10 μm is formed as a protective film 6 on the reflective film 5 by spin coating.

On the other hand, on the other surface 1b of the transparent substrate 1,
After a Ba ferrite film is applied and formed as the magnetic recording film 7, a varnish finish is applied to remove coarse projections on the surface and smooth the surface. The Ba ferrite film contains a binder to compensate for the strength enhancement and the lubrication action of the magnetic recording film 7. In addition, the film thickness is 2.0 μm, which is extremely thin and almost transparent.

As shown in FIG. 4, the recording / reproducing apparatus equipped with the first disk type recording medium records information on the magneto-optical recording film 3 on one surface side of the first disk type recording medium 20. A first magnetic head 21 is provided for recording, and recording / reproducing is performed on the optical head 22 for picking up recording information and the magnetic recording film 7 on the other surface side of the first disk type recording medium 20. A second magnetic head 23 is provided for this purpose. Since the Ba ferrite film as the magnetic recording film 7 is a very thin film as described above, no problem occurs even if the optical head 22 is on the same side as the second magnetic head 23.

Next, a case where the recording / reproducing apparatus is used as a memory unit of a digital electronic camera will be described. In this embodiment, the recording method for the magneto-optical recording film 3 is the magnetic field modulation overwrite method because the magneto-optical recording film 3 does not include an adjusting layer.

First, the apparatus is activated and the shooting environment is adjusted by the application software. Video (image) is first recorded on the magnetic recording film 7 side regardless of whether it is a still image or a moving image. Next, information is selected and transferred to the magneto-optical recording film 3 via an interface (not shown). The recorded information can be reproduced on both the magneto-optical recording side and the magnetic recording side.

As another application, it is possible to record all moving images on the magneto-optical recording film 3 and record still images on the magnetic recording film 7 side. In this case, since the recording film is different between the moving image and the still image, it is possible to record the still image without interrupting the recording of the moving image.

The memory unit is a PCMCIA.
(Personal Computer / Memory Card International Association) standard [Type 4] size (54mm x 85.6mm x 16.0mm)
Since it complies with, it can be stored in a general-purpose slot of a personal computer. Therefore, the recorded image (image) can be handled on the computer by simply replacing the memory unit with the computer from the digital electronic camera.

As described above, according to the first disk type recording medium, the large capacity memory unit can be downsized.

When the recording / reproducing apparatus is used as a memory unit of a workstation, for example, it is connected to the CPU via an interface.

That is, in the conventional case, the magneto-optical recording device and the fixed magnetic recording device are individually connected to the CPU through the interface, whereas in the recording / reproducing device, the memory unit can be downsized. Further, by simplifying the interface with the CPU, data reading can be speeded up.

[Embodiment 2] In the present embodiment, the magneto-optical recording film 3 in the structure of the disk type recording medium of [Embodiment 1] is replaced with G.
The same as Example 1 except that a laminated film made of dFeCo, GdFeCo, and TbFeCo was used. That is, in this embodiment, in the laminated film as the magneto-optical recording film 3, G
Since the GdFeCo film as the adjustment layer is interposed between the dFeCo film and the TbFeCo film, the optical modulation overwrite method is possible, and the first magnetic head 21 shown in FIG. 4 can be omitted. Regarding the film thickness, the film thickness of the magneto-optical recording film 3 is 0.08 as in the case of [Example 1].
formed to a thickness of μm.

In this embodiment, the first magnetic head 2
Since 1 can be omitted, the size can be further reduced as compared with the recording / reproducing apparatus described in [Embodiment 1].
That is, when used as a memory unit, the thickness can be further reduced, and the size can be made compliant with the PCMCIA [Type 3] size (54 mm × 85.6 mm × 10.0 mm).

The application of the recording / reproducing apparatus to the memory unit and the workstation is the same as that in the above-mentioned [Embodiment 1], and therefore its explanation is omitted.

[Embodiment 3] Second Embodiment as Second Recording Medium
An embodiment of the disk type recording medium will be described with reference to FIG. 2 again.

First, by the same procedure as in [Example 1],
On the transparent substrate 1 (glass substrate), the first dielectric film 2 (Si
N film), magneto-optical recording film 3 (GdFeCo and TbFeC)
laminated film), the second dielectric film 4 (SiN film),
The reflective film 5 (Al film) is sequentially laminated.

Subsequently, a NiP film having a film thickness of 11 μm is formed as a base layer 8 on the surface of the reflective film 5 by a plating method, the surface of the first base layer 8 is textured, and then an ultrathin film as a base film is formed. After forming the Cr film by sputtering, a 0.08 μm-thick Co-Ni- film is formed on the surface of the base film.
An alloy thin film as the magnetic recording film 7 containing Cr is formed by the sputtering method. Further, a carbon film having a thickness of 0.02 μm is formed as a protective film 9 on the surface of the magnetic recording film 7 by a sputtering method, and then a PFPE (perfluoropolyether) film having a thickness of 0.002 μm is formed as a lubricating film 10. It was applied and formed by spin coating.

As shown in FIG. 5, the recording / reproducing apparatus equipped with the second disk type recording medium records information on the magneto-optical recording film 3 on one surface side of the second disk type recording medium 24. A composite magnetic head 26 integrally formed with a magnetic head dedicated to magneto-optical recording and a magnetic head dedicated to magnetic recording for recording / reproducing on / from a magnetic recording film is provided, and a first disk type recording is also provided. An optical head 27 for picking up recorded information is arranged on the other surface side of the medium 24.
The recording / reproducing apparatus of this embodiment employs the magnetic field modulation overwrite method.

Further, in the second disk type recording medium, since the magnetic recording film 7 is formed on the side opposite to the optical head 27 from which laser light is emitted, the magnetic recording film 7 does not need to be transparent. (The magnetic recording film does not interfere with magneto-optical recording). Therefore, as described above, the magnetic recording film 7 of the second disk type recording medium is a metal thin film capable of higher density recording and further thinning.

The application of this recording / reproducing apparatus to a memory unit or a workstation is the same as in the above-mentioned [Embodiment 1], and therefore its explanation is omitted.

With the above configuration, a large capacity memory unit can be miniaturized.

[Embodiment 4] Third Embodiment as Third Recording Medium
An embodiment of the disk type recording medium will be described with reference to FIG. 3 again.

First, the diameter is 3.5 inches and the plate thickness is 0.6 mm.
A polycarbonate substrate is prepared as the transparent substrate 1. In addition, on the transparent substrate 1 (polycarbonate substrate),
Grooves and pits for magneto-optical recording are formed.

Then, the first dielectric film 2 (SiN film) and the magneto-optical recording film 3 (Gd) are formed on the surface of the transparent substrate 1 (polycarbonate substrate) by the same procedure as in [Example 1].
A laminated film made of FeCo and TbFeCo), a second dielectric film 4 (SiN film), and a reflective film 5 (Al film) are sequentially laminated.

Subsequently, polyethylene (thermoplastic resin) is applied and formed as the adhesive layer 11 on the reflective film 5, and the adhesive layer 1 is formed.
A glass substrate having a plate thickness of 0.6 mm as the transparent substrate 12 is bonded to the surface of 1. After subjecting the surface 1c of the transparent substrate 12 (glass substrate) to a predetermined texture treatment, the base film (Cr
Film) and an alloy thin film as a magnetic recording film 7 containing Co—Ni—Cr are respectively formed by the sputtering method. Then
Similar to [Example 3], carbon having a film thickness of 0.02 μm as the protective film 9 was formed on the surface of the magnetic recording film 7 by the sputtering method, and subsequently, the film having a film thickness of 0.002 as the lubricating film 10 was formed.
PFPE (perfluoropolyether) of μm is applied and formed by spin coating.

As shown in FIG. 5, the recording / reproducing apparatus equipped with the third disk type recording medium records information on the magneto-optical recording film 3 on one surface side of the third disk type recording medium 25. A composite type magnetic head 26 integrally formed with a magnetic head dedicated to magneto-optical recording and a magnetic head dedicated to magnetic recording for recording / reproducing on / from a magnetic recording film is provided, and a third disk type recording is also provided. An optical head 27 for picking up recorded information is arranged on the other surface side of the medium 25.
The recording / reproducing apparatus of this embodiment employs the magnetic field modulation overwrite method.

In the third disk type recording medium 25, since the magnetic recording film 7 is formed on the side opposite to the optical head 27 from which the laser light is emitted, the magnetic recording film 7 is formed.
Does not need to be transparent (the magnetic recording film does not interfere with magneto-optical recording). Therefore, like the second disk type recording medium, the magnetic recording film 7 is a metal thin film capable of higher density recording and further thinning.

The application of the recording / reproducing apparatus to the memory unit and the workstation is the same as in [Embodiment 1], and therefore its description is omitted.

Further, the above-mentioned [Example 1] to [Example 4].
Then, the disk type recording medium has been described, but it goes without saying that the same can be applied to a card type recording medium.

[0084]

As described above in detail, according to the recording medium of the present invention, since it has both the magneto-optical recording film and the magnetic recording film, it is possible to carry out recording and reproduction while making the best use of their respective advantages. . That is, in an application where a high transfer rate at the time of recording is required, by using the magnetic recording film, a transfer rate equivalent to that of normal magnetic recording can be secured. Further, by duplicating the soft information by using the magneto-optical recording film, the cost can be reduced. That is, for software information, application software can be provided at low cost by using a part or all of the magneto-optical recording film as a ROM (read-only memory).

Further, according to the recording / reproducing apparatus of the present invention, since the recording medium has both the magneto-optical recording film and the magnetic recording film, both the magneto-optical recording device and the magnetic recording device have hitherto been combined. In the workstations used as such, the recording medium is downsized, and a single device for recording / reproducing is required for the recording medium, and the overall size and cost of the device can be reduced. You can Also,
When used in a workstation or the like, the data read speed and the like can be increased by simplifying the interface with the central CPU.

Further, the magnetic recording surface film is made removable by applying the technology currently used for removable hard disks, and the entire device becomes removable, which is preferable for applications such as electronic cameras.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts of a first (disk-type) recording medium according to the present invention.

FIG. 2 is a cross-sectional view of essential parts of a second (disk-type) recording medium according to the present invention.

FIG. 3 is a cross-sectional view of essential parts of a third (disk-type) recording medium according to the present invention.

FIG. 4 is a conceptual diagram schematically showing a main part of a recording / reproducing apparatus according to the present invention.

FIG. 5 is a conceptual diagram schematically showing a main part of another recording / reproducing apparatus according to the present invention.

[Explanation of symbols]

 1 substrate (transparent substrate) 2 first dielectric film 3 magneto-optical recording film 4 second dielectric film 5 reflective film 6 protective film 7 magnetic recording film 8 underlayer film 9 protective film 10 lubricating film 11 adhesive layer 12 substrate ( Transparent substrate) 21 first magnetic head 22 optical head 23 second magnetic head 26 composite type magnetic head 27 optical head

Claims (14)

[Claims] 1. A recording medium comprising a magneto-optical recording film for recording / reproducing by magneto-optic and a magnetic recording film for recording / reproducing by magnetism. 2. The magneto-optical recording film is formed on one surface of a substrate, and the magnetic recording film is formed on the other surface of the substrate. recoding media. 3. The magneto-optical recording film is formed on one surface of the substrate via a first dielectric film, and the second dielectric film is further formed on the surface of the magneto-optical recording film. The recording medium according to claim 2, wherein: 4. A reflective film and a protective film are sequentially stacked on the surface of the second dielectric film.
The recording medium described. 5. The recording medium according to claim 1, wherein the magneto-optical recording film includes an adjustment layer. 6. The recording according to claim 1, wherein the magneto-optical recording film is formed on one surface of the substrate, and the magnetic recording film is further formed on the surface of the magneto-optical recording film. Medium. 7. The magneto-optical recording film is formed on one surface of the substrate via a first dielectric film, and a second magnetic film is formed between the magneto-optical recording film and the magnetic recording film. 7. The recording medium according to claim 6, wherein a dielectric film, a reflective film, and a base film are sequentially interposed, and a protective film and a lubricating film are sequentially stacked on the surface of the base film. 8. The magneto-optical recording film is formed on one surface of a first substrate, and the second substrate is formed on the surface of the magneto-optical recording film via an adhesive layer. The recording medium according to claim 1, wherein the magnetic recording film is formed on the surface of the second substrate. 9. The magneto-optical recording film is formed on one surface of the first substrate via a first dielectric film, and
9. A reflective film is interposed between the first dielectric film and the adhesive layer, and a protective film and a lubricating film are sequentially laminated on the surface of the magnetic recording film. The recording medium described. 10. A recording / reproducing device comprising a recording medium integrally formed with a magneto-optical recording film for recording / reproducing by magneto-optic and a magnetic recording film for recording / reproducing by magnetism. apparatus. 11. An optical head and a first magnetic head are arranged on one side of the recording medium, and a second magnetic head is arranged on the other side of the recording medium. The recording / reproducing apparatus according to claim 10, wherein 12. The recording / reproducing apparatus according to claim 10, wherein an optical head and a magnetic head are arranged on one surface side of the recording medium. 13. An optical head is arranged on one surface side of the recording medium, and a composite magnetic head is arranged on the other surface side of the recording medium. The recording / reproducing apparatus described. 14. The recording / reproducing apparatus according to claim 10, wherein a plurality of the recording media are incorporated.