JPH087389A - Optical information recording medium - Google Patents

Abstract

PURPOSE:To bond a magnetic recording region onto an optical disc levelly by a method wherein, when a magnetic ring is produced, the ring is punched out from its bonding layer side to its magnetic layer side and the ring is placed on the optical disc so as to have burrs produced at the time of punching upside. CONSTITUTION:An optical disc 1 has a spindle hole 4 for attaching itself to a recording/reproducing apparatus at its center and an annular optical recording region 2 having a required width is formed on the outer circumferential part of the optical disc 1. An annular magnetic recording region 3 for magnetic recording is also formed on the outer circumferential part of the optical disc 1 so as to overlap the optical recording region 2 partially. A burr 9 protruding upward is formed over the whole outer circumferential edge of the region 3 and a burr 10 protruding upward is formed over the whole inner circumferential edge of the region 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical information recording medium such as an optical disk or an optical card, and more particularly to a CD-ROM.
The present invention relates to a read-only optical information recording medium such as a ROM in which data cannot be written, and an optical information recording medium having a magnetic recording area on a part of a recording surface.

[0002]

2. Description of the Related Art In recent years, a CD-ROM has been widely adopted for data processing of computers. This CD-ROM
Is for playback only and cannot write data to the disc later. Therefore, after processing the data in the disc or during the data processing, the result cannot be written and saved in the disc, and must be written in another writable medium. In addition, at the time of aggregation of the data processing and restart of the data processing,
It is very inconvenient to use because there is a problem that it is necessary to use the other medium.

In order to solve this inconvenience, for example, a composite disk as described in JP-A-60-55526 and JP-A-01-217746 has been proposed. These disks are provided with an optical recording area and a magnetic recording area on a disk substrate, and have a read-only large-capacity optical recording method and a magnetic recording / reproducing method that has a small recording capacity but allows easy recording / reproducing. It is one.

In particular, FIG. 6 of JP-A-60-55526 describes an example in which a magnetic recording medium portion (magnetic recording area) is provided on the outer peripheral portion of an optical disk substrate, and FIG. 7 shows an optical disk. An example in which a magnetic recording medium portion (magnetic recording area) is provided on the inner peripheral portion of the substrate is described.

As a method of forming such a magnetic recording area on an optical disk, there is a method of punching and sticking a magnetic sheet in a ring shape.

[0006]

A problem of the method of punching and sticking a magnetic sheet in a ring shape is that the magnetic sheet is punched in a ring shape, so that burrs are generated at the ends of the magnetic ring. When the magnetic ring in which the burr is generated on the lower side (fixed layer side) is fixed to the flat surface of the optical disc to form the magnetic recording area, the burr protruding to the lower side loses the escape area and lifts the end surface of the magnetic recording area. When the inner and outer ends of the magnetic recording area are lifted up, it becomes impossible to fix the magnetic recording area flatly, and the magnetic head is lifted to cause a spacing between the magnetic head and the magnetic recording area. Therefore, there is a problem that a recording defect occurs.

The object of the present invention is to solve the above problems,
An object of the present invention is to provide an optical information recording medium capable of flatly fixing a magnetic recording area on an optical disc.

[0008]

Therefore, in the present invention, when manufacturing a magnetic ring from a magnetic sheet, the magnetic layer is punched from the fixed layer side to the magnetic layer side, and the burr generated at the end of the magnetic ring is formed on the upper side, that is, on the magnetic layer side. did.

[0009]

The burr generated on the magnetic layer side escapes to the upper side of the magnetic recording area, that is, in the air when the magnetic ring is attached to the optical disk to form the magnetic recording area. Therefore, this burr does not lift the end of the magnetic recording area, and forms a flat magnetic recording area.

[0010]

The present invention will be described in detail below with reference to the drawings.

FIG. 1 is an external perspective view of an embodiment of the optical disk of the present invention. The optical disc 1 has a spindle hole 4 for mounting it in a recording / reproducing apparatus in the center, and a ring-shaped optical recording area 2 having a predetermined width is formed on the outer side thereof. A magnetic recording area 3 for ring-shaped magnetic recording is formed on the outer peripheral portion of the optical disc by overlapping.

FIG. 2 is a sectional view taken along line AA of FIG. Reference numeral 1 is an optical disk, 8 is a transparent substrate such as polycarbonate, epoxy resin, or glass, 5 is a recording layer having concentric or spiral irregularities formed on the transparent substrate 8, and 6 is formed on the recording layer 5. Is a reflective layer made of aluminum or the like, 7 is a top coat layer made of an ultraviolet curing (UV) resin or the like formed on the reflection layer 6, and 3 is a magnetic recording region fixed on the top coat layer 7. . Burrs 9 are formed on the outer peripheral edge of the magnetic recording area 3 in the entire circumference, and burrs 10 are formed on the inner peripheral edge of the magnetic recording area 3 in the entire circumference.

FIG. 3 is a perspective view showing the appearance of a second embodiment of the optical disk of the present invention. The optical disc 1 has a spindle hole 4 at the center for mounting on a recording / reproducing device,
A ring-shaped optical recording area 2 having a predetermined width is provided outside thereof.
And a ring-shaped magnetic recording area 11 for magnetic recording is formed between the spindle hole 4 and the optical recording area 2.

FIG. 4 is a sectional view taken along line BB of FIG. Reference numeral 8 is a transparent substrate made of, for example, polycarbonate, epoxy resin, glass or the like, 5 is a recording layer having concentric or spiral irregularities formed on the transparent substrate 8, and 6 is aluminum or the like formed on the recording layer 5. Is a top coat layer made of ultraviolet curing (UV) resin or the like formed on the reflection layer 6, and 11 is a magnetic recording region fixed on the transparent substrate 8. The magnetic recording area 3 is fixed on a flat ridge 14 having a flat top formed concentrically with the spindle hole 4 on the inner peripheral portion of the transparent substrate 8. The height of the flat ridge 14 is about 0.2 mm. The function of the flat ridges 14 is to prevent the flat ridges 14 from functioning as spacers for the optical discs 1 when the optical discs 1 are stacked and contacting the optical recording area 2 with the transparent substrate 8 of the adjacent optical disc 1. Especially. Burrs 12 are formed on the entire outer circumference of the magnetic recording area 11 in the upward direction, and burrs 13 are formed on the inner circumference of the magnetic recording area 11 in the entire circumference.

FIG. 5 is a central sectional view of the magnetic recording areas 3 and 11 in a single state. The magnetic recording areas 3 and 11 are the adhesive layer 1
5, the base film 16, the magnetic layer 17, and the protective layer 1
It consists of 4 layers of 8. The magnetic recording areas 3 and 11 are punched out in a ring shape from the adhesive layer 15 side toward the protective layer 18 side. Therefore, burrs 9 and 12 are formed on the outer peripheral ends of the magnetic recording regions 3 and 11, and burrs 10 and 13 are formed on the inner peripheral ends.
Occurs.

The adhesive layer 15 is made of a heat-sensitive adhesive such as vinyl chloride-vinyl acetate copolymer, ethylene-vinyl acetate copolymer, polyamide resin, polyester resin, etc. Agents and antioxidants are added. The thickness of the adhesive layer 15 is 10 to 30 μm.
Is appropriate.

The base film 16 is, for example, a heat-resistant tape made of polyester, polyimide, polyacetate or the like, and its thickness is suitably 40 μm or more.

The magnetic powder in the magnetic layer 17 is γ-Fe.
₂ O ₃ powder, Co-γ-Fe ₂ O ₃ powder, metal powder, Ba-ferrite powder, etc. are used, and as a binder, vinyl chloride-vinyl acetate copolymer, polyvinyl butyral resin, fibrin resin, Polyester resin, phenol resin, polyimide resin, etc. are used. Magnetic layer 17
The appropriate thickness is 0.3 to 10 μm. Various additives such as a dispersant, an abrasive, a lubricant, and an antistatic agent may be added to the magnetic layer 17. This magnetic layer 17 is
For example, it can be obtained by applying a magnetic paint consisting of 75 parts by weight of γ-Fe ₂ O ₃ powder, 20 parts by weight of vinyl chloride-vinyl acetate copolymer, 5 parts by weight of DOP, and 110 parts by weight of organic solvent and drying.

The protective layer 18 is made of, for example, a release agent having a poor surface activity such as silicone resin or methyl methacrylate, and its thickness is preferably 0.1 to 5 μm. Since the release agent is scientifically stable, the protective function of the magnetic layer 17 can be sufficiently exerted.

FIG. 6 shows a manufacturing process for fixing the magnetic recording area 11 to the optical disk 1. The magnetic recording area 11 is attracted and held by, for example, vacuum attraction means (not shown) and set on the flat ridge 14 on the optical disk 1. The set magnetic recording area 11 is a flat heating and pressing jig 19
It is fixed by being heated or pressure-bonded on the optical disk 1.

FIG. 7 shows a magnetic recording area 1 formed between a spindle hole 4 and an optical recording area 2 according to an embodiment of the present invention.
Magnetic recording partial RAM (Random Access Memory) loaded with an optical disc 1
y) CD-ROM (Compact Disk-R)
1 shows an ead Only Memory) drive. The drive device includes a chassis 20, a spindle motor 21, an optical head carriage 25, a magnetic head carriage 29, feed motors 27 and 31, and an optical disk 1. A spindle motor 21 is placed in the center of the chassis 20, and a turntable 22 and a spindle 23 are fixed to the shaft end of the spindle motor 21. The optical disc 1 is placed on the turntable 22 and the disc clamper 24
It is pressed against the turntable 22 by. A guide rail 26 is fixed to the chassis 20, and the optical head carriage 25 slides in the radial direction of the optical disc 1 by a feed motor 27 while being guided by the guide rail 26. The optical head carriage 25 has an optical head 28 for reading data from the optical disc 1. A guide rail 30 is fixed to the chassis 20.
Guided by 0, the magnetic head carriage 29 slides in the radial direction of the optical disc 1 by the feed motor 31.
The magnetic head carriage 29 has a magnetic head 32,
Magnetic recording is performed by contacting the magnetic recording area 11 formed on the optical disc 1.

[0022]

According to the present invention, when the magnetic ring is manufactured, the magnetic sheet is punched from the fixed layer side toward the magnetic layer side. Therefore, burrs can be generated on the magnetic layer side. When the magnetic recording area is formed by adhering to, the burr escapes above the magnetic recording area, that is, in the air, so that the end of the magnetic recording area is not lifted.
The magnetic recording area can be stuck flat.

[Brief description of drawings]

FIG. 1 is an external perspective view of an optical disc according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an external perspective view of an optical disc according to a second embodiment of the present invention.

FIG. 4 is a sectional view taken along line BB of FIG.

FIG. 5 is a cross-sectional view of a single magnetic recording area of the present invention.

FIG. 6 is a schematic view illustrating a manufacturing method for forming a magnetic recording area of the present invention on an optical disc.

FIG. 7 is a cross-sectional view showing a state in which an optical disc according to an embodiment of the present invention is mounted in a drive device.

[Explanation of Codes] 1 ... Optical disc, 2 ... Optical recording area, 3, 11 ... Magnetic recording area, 4 ... Spindle hole, 8 ... Transparent substrate, 9, 10, 1
2, 13 ... Burrs, 14 ... Flat ridges, 15 ... Adhesive layer,
16 ... Base film, 17 ... Magnetic layer, 18 ... Protective layer.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ryuichi Koike 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa, Ltd. Information & Video Media Division, Hitachi, Ltd. (72) Akira Miyake 1-88, Tora, Ibaraki-shi, Osaka No. Hitachi Maxell Co., Ltd.

Claims (1)

[Claims] 1. An optical information recording medium having a transparent substrate, an optical recording region formed on the transparent substrate, and a magnetic recording region formed on the transparent substrate and capable of writing or reproducing data. The magnetic recording region comprises a base film, a magnetic layer formed on the surface of the base film, and a fixed layer applied to the back surface of the base film, and punched from the fixed layer side toward the magnetic layer side. An optical information recording medium, which is a magnetic ring having a burr-generating surface on the magnetic layer side.