JPH09120596A - Discoid optical recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To drastically improve working efficiency by enabling work to be continuous without requiring exchanging and setting operations, etc., on all such occasions that operational confirmation, adjustment or inspection, etc., in a manufacturing process of a recording and reproducing device. SOLUTION: A disk substrate 2 of the discoid optical recording medium is formed of a transparent polycarbonate resin, etc., having high light transmittance and characteristics of both mechanical and chemical durability as a material by the injection molding method using a molding die. At the time of molding the disk substrate 2, on a main surface 4 on its one side, pits 11 to be recorded with a desired information signal, a pregroove 13 for constituting a recording track and an optical guide groove 14 are transfer-formed in information signal recording parts 7, 8 and 9 by a stamper assembled in the molding die. The pits 11 are so constituted that coded small holes having different lengths respectively in the circumferential direction in accordance with the desired information signal are positioned on a concentric circle, and are provided in regions corresponding to a 1st information signal recording part 7, a read-in information recording part 9 and a read-out information recording part. The 1st information signal recording part 7 is recorded with an unrewritable information signal as coded information by the pits 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc-shaped optical recording medium such as an optical disc having a plurality of information signal recording areas having a film layer structure having different information signal recording formats and light reflectivities.

[0002]

2. Description of the Related Art Discotic optical recording media such as optical disks are made of transparent polycarbonate resin, polyvinyl chloride resin, which has high light transmittance and mechanical or chemical resistance.
A recording medium substrate is formed of a synthetic resin material such as acrylic resin. The disc-shaped optical recording medium includes a read-only disc-shaped optical recording medium (optical disc) used exclusively for reproducing the recorded information signal and an information signal because of the difference in the configuration of the information signal recording unit formed on the recording medium substrate. Can be roughly classified into a write-once disc-shaped optical recording medium capable of recording information in the information signal recording unit and a recordable disc-shaped optical recording medium (magneto-optical disc) capable of rewriting the information signal recorded in the information signal recording unit. To be done.

For example, as shown in FIGS. 5 and 6, a compact disc 100, which is a read-only optical disc having a diameter of 120 mm, has a disc substrate 101 having a center hole 102 formed of, for example, a transparent polycarbonate resin. During molding, pits 104 arranged in a concentric circle are transferred and formed on one main surface 103 of the disc substrate 101 by a stamper incorporated in a molding die. These pits 104 are formed on the one main surface 103 of the disk substrate 101 as coded small holes having different circumferential lengths corresponding to a predetermined information signal. In addition, in the center hole 102, the compact disc 10
A not-illustrated metal hub that is magnetically chucked is attached to the disk table of the reproducing device when 0 is loaded in the reproducing device.

The compact disc 100 is shown in FIG.
As shown in FIG. 3, a reflective layer 105 is formed by vapor-depositing aluminum or the like having a high light reflectance on the one main surface 103 of the disc substrate 101 in which the pits 104 are formed, and the entire surface is covered with a protective layer 106. Is configured. The compact disc 100 is irradiated with laser light emitted from the optical pickup from the other main surface 107 side to reproduce an information signal corresponding to the pit 103.

In the compact disc 100 described above, the area from the outer peripheral portion of the center hole 102 to the outermost peripheral portion is constituted as the signal recording portion 108 having the above-mentioned film layer structure, and the inner peripheral area is between 50 mm and 116 mm. Is an information signal recording unit 109 in which an information signal is recorded. In the compact disc 100, the inner peripheral portion of the information signal recording unit 109 is a lead-in information recording unit 110 recording the operation information signal of the reproducing apparatus, and the outer peripheral portion of the information signal recording unit 109 is also the reproducing apparatus. The read-out information recording unit 111 records operation information signals and the like.

On the other hand, also in the magneto-optical disk 120, as shown in FIGS. 7 and 8, a disk substrate 121 having a central hole 122 is formed of, for example, transparent polycarbonate resin. The center hole 122 is provided with a metal hub (not shown) that is magnetically chucked to the disk table of the recording / reproducing apparatus when the magneto-optical disk 120 is loaded in the recording / reproducing apparatus.

The magneto-optical disk 120 is a disk substrate 1
The signal recording portion 124 is formed from the outer peripheral portion of the central hole 122 of the one main surface 123 of the reference numeral 21 to the vicinity of the outermost peripheral portion. Further, the signal recording section 124 is composed of a lead-in information recording section 126 on the inner peripheral portion and a lead-out information recording section 127 on the outer peripheral portion sandwiching the information signal recording section 125 in which the information signal is further written. ing.

The information signal recording section 125 records an information signal by, for example, a magneto-optical recording method, and as shown in FIG. A pre-groove 128 composed of a spiral convex portion having a fine pitch which constitutes a recording track on which a desired information signal is written and recorded on the surface 123.
And the light guide grooves 129 are alternately formed. The information signal recording section 125 has a main surface 1 on one side of the disk substrate 121 on which a pre-groove 128 and an optical guide groove 129 are formed.
A perpendicular magnetization film layer formed by laminating a first dielectric layer 130, a magnetic film layer 131, and a second dielectric layer 132 is formed on 23 by a sputtering method, a vapor deposition method, or the like. The reflective layer 133 is formed by vapor-depositing aluminum or the like having a higher light reflectance, and then the whole is covered with the protective layer 134.

The lead-in information recording section 126 and the lead-out information recording section 127 will not be described in detail. However, similar to the above-mentioned optical disc, a stamper incorporated in a molding die is used when the disc substrate 121 is molded. Pits corresponding to operation signals and the like arranged on the concentric circles are transferred and formed. It should be noted that these pits are formed on the one main surface 123 of the disk substrate 121 as small holes encoded with different circumferential lengths corresponding to predetermined operation signals. Therefore, the lead-in information recording unit 126 and the lead-out information recording unit 127
Is configured as an area where the recording of the information signal is disabled.

The magneto-optical disk 1 constructed as described above.
Reference numeral 20 denotes an information signal to be written / recorded by the external magnetic field generator in a state where the information signal recording section 125 is irradiated with the laser beam emitted from the optical pickup from the other main surface 135 when loaded in the recording / reproducing apparatus. The information signal is recorded in the information signal recording unit 125 by applying an external magnetic field that is magnetic field modulated in accordance with the above. Further, when the magneto-optical disk 120 is loaded in the recording / reproducing apparatus, the laser light emitted from the optical pickup and applied to the information signal recording section 125 via the main surface 135 is magnetized in the magnetization direction according to the recorded information signal. Accordingly, the recorded information signal is reproduced by utilizing the Kerr effect in which the plane of polarization rotates.

As described above, the optical disk 100 and the magneto-optical disk 120 are respectively the information signal recording section 10 thereof.
The film layer structures of 9 and 125 are different, and the reflectance of the irradiated laser light is the first dielectric layer 130 and the magnetic film layer 131.
And the presence or absence of a recording layer formed of the second dielectric layer 132. In the magneto-optical disk 120, the irradiation laser beam is affected by the recording layer, so that the optical disk 10
The reflectance is smaller than 0.

[0012]

On the other hand, the optical disk 100 and the magneto-optical disk 120 described above can be used in common by, for example, a recording / reproducing apparatus described in Japanese Patent Application Laid-Open No. 4-103074 "Disk reproducing apparatus". . Therefore, in such a recording / reproducing apparatus, the optical disk 100 having a different film layer structure and the magneto-optical disk 120 are replaced with each other to perform a predetermined operation in the adjustment, inspection, or maintenance in the manufacturing process. This work
Since it takes time to replace the disc, it is not only long and troublesome, but also there is a problem that a plurality of test discs must be always provided.

Further, the optical disc 100 and the magneto-optical disc 120 are capable of recording information signals at a high density, and are therefore used for various purposes. For example, manuals for various devices and language learning. It is also considered to be used as an application. In such a usage example, if the content of the operation performed based on the information recorded in advance can be recorded each time, it is effective and convenient for later confirmation and repeated practice. However, as described above, the optical disc 100 cannot be used for this purpose because it is a read-only type. In addition, the magneto-optical disk 120
May cause inconvenience that predetermined information is accidentally erased.

Although the conventional optical disc 100 and magneto-optical disc 120 are preliminarily recorded with operation information signals for device control in the inner and outer peripheral areas, the information signal recording sections 109 and 125 are entirely the same. A mass production effect has been achieved by using a layered structure. Therefore, the characteristics of the optical disc 100 and the magneto-optical disc 120 are not fully utilized.

Therefore, the present invention has been proposed for the purpose of providing a disc-shaped optical recording medium for shortening or simplifying the manufacturing process and maintenance work of a recording / reproducing apparatus and expanding the field of use. .

[0016]

A disk-shaped optical recording medium according to the present invention which achieves this object is provided with a signal recording section formed on a disk-shaped optical recording medium substrate molded of a transparent synthetic resin material. A plurality of information signal recording portions having a film layer structure having different information signal recording formats and light reflectances in the radial direction are concentrically formed. Further, these information signal recording units are composed of a first information signal recording unit which is not capable of recording information signals and a second information signal recording unit which is capable of recording information signals, and are arranged in the radial direction. It is configured by being formed concentrically with each other.

According to the disc-shaped optical recording medium of the present invention configured as described above, it is possible to deal with manufacturing and maintenance of the recording / reproducing apparatus without performing replacement operation according to the purpose of use. A new information signal is recorded without accidentally erasing the valuable information signal.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described in detail below with reference to the drawings. A disk-shaped optical recording medium 1 shown as a first embodiment in FIGS. 1 and 2.
The disk substrate 2 is molded by an injection molding method using a molding die made of a synthetic resin having a high light transmittance and having a mechanical resistance and a chemical resistance, such as a transparent polycarbonate resin. The disc substrate 2 has a central hole 3 into which a metal hub (not shown) that is magnetically chucked is attached to the disc table of the recording / reproducing apparatus, and one main surface 4 is recorded with an information signal recorded as described later. In addition to being configured as a surface, the other main surface 5 is configured as a reading surface for reproducing the recorded information signal or recording the information signal.

In the disc-shaped optical recording medium 1, as shown in FIG. 1, a signal recording portion 6 is formed from the outer peripheral portion of the central hole 3 of the disc substrate 2 to the vicinity of the outermost peripheral portion.
The signal recording unit 6 is further divided into a plurality of concentric regions, and a first information signal recording unit 7 on the inner circumference side, a second information signal recording unit 8 on the outer circumference side, and It is composed of a lead-in information recording section 9 on the inner peripheral portion and a lead-out information recording section 10 on the outer peripheral portion sandwiching it.

As shown in FIG. 2, the information signal recording section 125 includes a pit 11 in which a desired information signal is recorded on one main surface 4 by a stamper incorporated in a molding die when the disk substrate 2 is molded. The pre-groove 13 and the light guide groove 14 that form the recording track are transferred and formed.
Like the conventional optical disc 100 described above, the pit 11 is formed by arranging coded small holes having different lengths in the circumferential direction in concentric circles in correspondence with a predetermined information signal. The first information signal recording unit 7, the lead-in information recording unit 9, and the lead-out information recording unit 10
It is provided in the area corresponding to.

In the first information signal recording section 7, an information signal which cannot be rewritten, for example, an information signal corresponding to predetermined information such as commentary information of operation procedures and model information, is recorded in the pit 1 described above.
It is recorded as coded information according to 1. The lead-in information recording section 9 also includes a disc-shaped optical recording medium 1
When the recording / reproducing apparatus is loaded into the recording / reproducing apparatus and a recording operation or a reproducing operation is performed, control information for starting the recording / reproducing apparatus or the like is recorded as encoded information by the pit 11. Similarly, in the lead-out information recording section 10, control information for controlling the recording / reproducing apparatus when the recording operation or the reproducing operation is stopped is recorded as the information encoded by the pit 11 described above.

Although not described in detail, the first information signal recording section 7 is located at the outermost peripheral portion which is a boundary with a second information signal recording section 8 which will be described later. Identification information of the signal recording unit 7 and the second information signal recording unit 8 is recorded. The identification information is detected by the recording / reproducing apparatus to cause the recording / reproducing mechanism including the optical pickup, the magnetic field applying mechanism, etc. of the recording / reproducing apparatus to switch the mode. The mode switching of the recording / reproducing apparatus is performed by detecting this because the first information signal recording unit 7 and the second information signal recording unit 8 have different light reflectances as described later. You may do it.

The second information signal recording section 8 is configured as an area in which an arbitrary information signal can be written, as will be described later, and is the same as the optical signal recording section 125 of the conventional magneto-optical disk 120 described above. It has a film layer structure capable of writing information signals by a magnetic recording method. That is, in the second information signal recording portion 8, the convex pre-groove 13 and the concave optical guide groove 14 are spirally formed at a fine pitch, and the magneto-optical recording layer 15 is formed over the entire area. ing.

As shown in FIG. 2, the magneto-optical recording layer 15 is formed on the one main surface 4 of the disk substrate 2 in which the pre-groove 13 and the optical guide groove 14 are formed by a high frequency sputtering method or a vapor deposition method. The first dielectric layer 16 and the magnetic film layer 17
And the second dielectric layer 18 are formed in a laminated state. The magnetic film layer 17 includes, for example, terbium iron cobalt (TbFeCo), gadolinium terbium iron (GdTbFe), and terbium cobalt (TbCo).
Material such as is used. The first dielectric layer 16 and the second dielectric layer 18 have the function of increasing the Kerr rotation angle of reflected laser light, which will be described later, and are formed with a film thickness of λ / 4n.

The disc-shaped optical recording medium 1 is relatively easily manufactured by masking other regions when the magneto-optical recording layer 15 is formed on the second information signal recording portion 8 described above.

The disc-shaped optical recording medium 1 has, as described above, the entire signal recording portion 6 having a different film layer structure in the radial direction.
After the reflective layer 19 is formed by vapor-depositing aluminum or the like having a high light reflectance, a protective layer 20 is further formed by coating. The protective layer 20 has a function of preventing the entry of moisture or the like from the disk substrate 2 and a function of preventing the material of the magneto-optical recording layer 15 from peeling off or cracking.
For example, Si ₃ N ₄ , SiO ₃ , SiN ₃ , ZnS, Y ₃
Materials such as O ₃ are used.

In the disc-shaped optical recording medium 1 having the above-mentioned structure, when loaded in the recording / reproducing apparatus, the laser beam emitted from the optical pickup is irradiated onto the signal recording section 6 from the other main surface 5. It The laser light is reflected by the reflection layer 19, is exposed from the main surface 5 to the outside, and is re-incident on the optical pickup to optically process the information signal.

In the first information signal recording section 7, the lead-in information recording section 9 and the lead-out information recording section 10, the presence or absence and the shape of the pit 11 are emitted from the optical pickup and are incident on the main surface 5. The difference between the incident light amount of the laser light and the reflected light amount reflected by the reflection layer 19 or the intensity of the reflected light amount is identified by utilizing the diffraction phenomenon of the light, and the encoded recorded information signal is obtained. Is played.

In the second information signal recording portion 8, the laser light emitted from the optical pickup and incident on the main surface 5 is used as a heat source, and the magneto-optical recording layer 15 is locally irradiated by the irradiation of this laser light. The coercive force is reduced by raising the temperature to near the Curie temperature. In this state, an external magnetic field corresponding to the information signal is applied to the magneto-optical recording layer 15 from the external magnetic field generator. Magnetic film layer 17 of magneto-optical recording layer 15
As a result, the magnetization is inverted and the information signal is written.

The second information signal recording section 8 reproduces an information signal by utilizing the Kerr effect in which the laser light emitted from the optical pickup and incident on the main surface 5 is polarized by the magnetic force of the magnetic film layer 17. Is done. The laser light is magnetized in the patterned magnetic film layer 1 corresponding to the information signal.
The polarization plane of the reflected light reflected by the reflection layer 19 is rotated by Kerr 7, and this is optically detected.

The disc-shaped optical recording medium 1 configured as described above is used, for example, in a manufacturing process of a recording / reproducing apparatus in which a disc-shaped optical recording medium for reproduction only and a disc-shaped optical recording medium for both recording and reproduction can be used. It is used as a jig disk for combined use such as operation confirmation, adjustment and inspection of each part such as an optical pickup, an external magnetic field generator or a signal processing part. The disc-shaped optical recording medium 1 includes a first information signal recording unit 7 that enables only the reproduction of the information signal recorded as described above, and a second information signal recording unit 8 that allows the writing of the information signal. Therefore, it is possible to continuously perform the above process without performing a jig disc replacement operation.

The disk-shaped optical recording medium 1 is, for example, the first
It is also used when the answer information to the task information previously recorded in the information signal recording unit 7 is recorded in the second information signal recording unit 8. The disc-shaped optical recording medium 1 has a conventional disc-shaped optical recording medium 100 and a magneto-optical disc 120 by selectively using a first information signal recording unit 7 and a second information signal recording unit 8 having different specifications. Various usages that were not expected are developed.

Since the disc-shaped optical recording medium 1 has almost the same external specifications as the conventional optical disc or the like, it is not necessary to develop a special recording / reproducing apparatus.

As a second embodiment of the present invention, in the disc-shaped optical recording medium 30 shown in FIGS. 3 and 4, a plurality of information signal recording portions 32 to 35 having different layer structures are concentric in the radial direction. It has a feature in the configuration formed in the shape of a circle. In the following description, the disc-shaped optical recording medium 1 described above is used.
The same parts as those in FIG.

That is, the disc-shaped optical recording medium 30 is shown in FIG.
As shown in FIG. 3, the signal recording portion 31 is formed from the inner peripheral portion of the disk substrate 2 in the vicinity of the central hole 3 to the peripheral area of the outermost peripheral portion. The signal recording section 31 is further divided into a plurality of areas concentric with each other, and is described above with the lead-in information recording section 36 in the innermost peripheral area and the lead-out information recording section 37 in the outermost peripheral area sandwiched therebetween. So first
The information signal recording unit 32 to the fourth information signal recording unit 35 are formed concentrically with each other.

The first information signal recording section 32 and the third information signal recording section 34 have the same film layer structure, and for example, the first information signal recording of the disc-shaped optical recording medium 1 described above. Similar to the section 7, it is configured as an information signal recording section dedicated to reproduction of an information signal in which pits 11 encoded and arranged on the main surface 4 side are formed. Further, the second information signal recording unit 33 and the fourth information signal recording unit 35 have the same layer structure, and for example, the second information signal recording unit 8 of the disc-shaped optical recording medium 1 described above. Similarly, a magneto-optical recording layer 15 capable of writing and recording an information signal is formed on the main surface 4 side.

In the disc-shaped optical recording medium 30, the reflective layer 19 is formed on the entire signal recording portion 31 having the different film layer structure in the radial direction as described above, and then the protective layer 20 is further covered. It is configured.

The disc-shaped optical recording medium 30 configured as described above is used, for example, in the manufacturing process of a recording / reproducing apparatus in which a disc-shaped optical recording medium for reproduction and a disc-shaped optical recording medium for both recording and reproduction can be used. , Is used as a common jig disk for continuously performing operation confirmation, adjustment, inspection, etc. during the operation of each unit such as an optical pickup, an external magnetic field generator, or a signal processing unit. The disc-shaped optical recording medium 30 is writable with an information signal, as well as a first information signal recording section 32 and a third information signal recording section 34 which can only reproduce the information signal recorded as described above. Since the second information signal recording unit 33 and the fourth information signal recording unit 35 are provided, the above-described process processing is continuously performed without performing a jig disc replacement operation or a cueing operation each time. It is possible.

When the disc-shaped optical recording medium 30 is used for language learning, for example, teacher voice data is recorded in advance in the first information signal recording section 32 or the third information signal recording section 34. It In the disc-shaped optical recording medium 30, after reproducing this audio data, the audio data of the user is recorded in the second information signal recording unit 33 or the fourth information signal recording unit 35. Therefore, the user can check the voice data of the teacher and his own voice data at any time,
In addition, since it is possible to newly re-record the voice data of oneself, more efficient language learning can be achieved.

The present invention relates to the above-mentioned disc-shaped optical recording medium 1,
The present invention is not limited to the configuration and use example of 30, and various developments can be made as follows. In these disc-shaped optical recording media 1 and 30, two information signal recordings, that is, an information signal recording section having a film layer structure of information signal read-only specification and an information signal recording section having a layer structure of information signal writing specification, are carried out. Although the portion is configured in the radial direction, an information signal recording portion having a film layer structure provided in, for example, a conventional write-once disc-shaped optical recording medium may be provided in the radial direction in addition to any one of them or in addition to these. Of course.

[0041]

As described in detail above, according to the disc-shaped optical recording medium of the present invention, the operation such as replacement and setting is performed each time when checking, adjusting or inspecting the operation in the manufacturing process of the recording / reproducing apparatus. It becomes possible to carry out this continuously without needing to, and it is possible to greatly improve the work efficiency. Further, according to the disc-shaped optical recording medium of the present invention, it can be used for various purposes with good usability without changing the structure of the recording / reproducing apparatus, and the field of use can be greatly expanded. .

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of a disc-shaped optical recording medium according to the present invention.

FIG. 2 is a longitudinal sectional view of a main part of the disk-shaped optical recording medium.

FIG. 3 is a perspective view of a main part of another disc-shaped optical recording medium according to the present invention.

FIG. 4 is a vertical cross-sectional view of a main part of the disk-shaped optical recording medium.

FIG. 5 is a perspective view of a main part of an optical disc.

FIG. 6 is a longitudinal sectional view of a main part of the optical disc.

FIG. 7 is a perspective view of a main part of a magneto-optical disk.

FIG. 8 is a longitudinal cross-sectional view of a main part of the magneto-optical disk.

[Explanation of symbols]

 1 Disc-shaped optical recording medium 2 Disc substrate (disc-shaped optical recording medium substrate) 4 Recording surface side main surface 5 Reading surface side main surface 6 Signal recording part 7 First information signal recording part 8 Second information signal recording Part 9 Lead-in information recording part 10 Lead-out information recording part 11 Pit 12 Reflective layer 13 Pre-groove 14 Optical guide groove 15 Magneto-optical recording layer 17 Magnetic film layer 19 Reflective layer 20 Protective layer

Claims (3)

[Claims] 1. A signal recording portion formed on a disk-shaped optical recording medium substrate formed of a transparent synthetic resin material, and a recording format of an information signal and a light reflectance are different from each other in the radial direction. A disc-shaped optical recording medium, wherein a plurality of information signal recording portions having a film layer structure are concentrically formed. 2. A plurality of information signal recording sections having a film layer structure having a different light reflectance from the recording format of the information signal, at least a first information signal recording section in which the information signal cannot be recorded, and information. A second information signal recording section capable of recording a signal, and the first information signal recording section and the second information signal recording section are formed concentrically and alternately in the radial direction. The disc-shaped optical recording medium according to claim 1, wherein 3. The disc-shaped optical recording medium according to claim 2, wherein identification information signals are recorded in the first information signal recording section and the second information signal recording section, respectively.