JPH0785625A - Optical information recording medium - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a medium that is an optical information recording medium suitable as a document file that is inexpensive and can be stored for a long period of time, and in which the storage cost can be reduced without particularly impairing the storage stability. With the goal. [Structure] An optical information recording medium comprising a disk-shaped transparent transparent substrate made of synthetic resin and having a recording layer provided on the surface of the substrate. An optical information recording medium equipped with a detachable hub, which stands up from a flange portion along with and is fitted with a fitting claw that is inserted into an opening in a central portion of a substrate without substantial looseness.

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, and is an optical information recording medium suitable as an inexpensive and long-term storable document file, and particularly, it does not impair storage stability and storage cost. A medium that can be reduced.

[0002]

2. Description of the Related Art In recent years, a recording medium capable of recording and reproducing a large amount of data at high density and at high speed has been demanded as the amount of information has increased. Optical discs are highly expected to meet such applications. ing. Optical disks are classified into a write-once type that allows recording only once and a rewritable type that allows recording / erasing as many times as desired.

Examples of the rewritable optical disk include a magneto-optical recording medium which utilizes the magneto-optical effect and a phase change medium which utilizes the reflectance change accompanying the reversible change of the crystalline state. Unlike ordinary hard disks, optical disks can be taken out of the drive and carried or stored. That is, it is said that portability is an advantage.

However, because of its portability, the hub is usually fixed and further enclosed in a cartridge. In other words, in order to rotate the disc at high speed, the disc must be securely fixed on the rotating shaft (spindle). Therefore, the metal hub is fixed to the disc, and the magnetic force between the hub and the spindle is fixed. It is common to fix with.

Further, it is usual to enclose the disc in a cartridge case so as not to damage it when handling it. Although the compact disc does not have a hub and a cartridge, the hub is unnecessary because the number of revolutions of the compact disc is several hundred rpm at most and there is no fear of slipping on the spindle.

[0006] In addition, the usual compact disc is not protected by a hard coat or the like on the laser light incident surface of the substrate, and without a cartridge, there is a risk of scratches or the like in storing chord data in addition to music data. It's very bad.

[0007]

However, such a hub or cartridge is not necessary for the purpose of recording and storing a large amount of documents that do not require frequent access for the time being. In this case, it requires several times as much space as the disk itself to be stored, and while it occupies a large part of the manufacturing cost, it is completely wasteful to simultaneously store a hub that is used only for recording and playback. is there.

Also, since there is no fear of being damaged by handling during storage, there is little need to protect with a cartridge. However, such a disc structure is defined by an international standard (ISO / IEC9171-1, etc.), and is indispensable at the time of inserting the drive for ensuring compatibility. Even if the density of discs is increased in the future, it is expected that the standard based on such hubs and cartridges will be adopted (ECMA double standard 130 mm optical disc standard, ECM
A3 double density 130mm disc standard, currently ECMA / T
Under discussion at C31. ECMA stands for European computer manufa
Abbreviation for cturers association. )

[0009]

The inventors of the present invention have found that such uses as a document file which is infrequently accessed but is desired to be stored for a long period of time occupies a considerable part of the purpose of use of an optical disk file. In view of this, it is important to provide a recording medium that is inexpensive, does not occupy storage space, and has excellent long-term storage stability, and at this time, it is important to be compatible with media that comply with conventional international standards. The invention was reached.

That is, the gist of the present invention is an optical information recording medium having a recording layer provided on a disk-shaped transparent substrate made of synthetic resin having an opening in the central portion thereof. An optical system in which a detachable hub, which is upright from a flange portion along the surface of the substrate and has a fitting claw that is inserted into the aperture in the central portion of the substrate without being loosened, is attached to the aperture. Information recording medium and an optical information recording medium in which a recording layer is provided on a single substrate, or two substrates are bonded to each other with an adhesive or spacers with the recording layer inside. It is a medium for recording / reproducing information while rotating at a rotation speed of 1800 rpm or more, and has a tilt of 3 mrad or less and an eccentricity of 50 um during rotation.
The following is an optical information recording medium in which a detachable hub fixed to a rotary shaft stage of a recording / reproducing apparatus and a cartridge are mounted.

In the case of a document file, etc., once recorded,
There is little need to access and rewrite frequently,
However, it is required to be stably stored for a long period of time.
Therefore, it is an inexpensive medium that can be disposable and has excellent storage stability, and is a light that records and reproduces information that is optically detectable by punching, deforming or disassembling the recording layer or the substrate surface in contact with the recording layer. Once medium is useful.

Among them, the write-once medium coated with the dye by the single-layer spin coating method is suitable for the recording layer of the recording medium of the present invention because of its low manufacturing cost and excellent storage stability. Hereinafter, the optical information recording medium of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of an example of the optical information recording medium of the present invention, FIG. 2 is a perspective view of the hub shown in FIG. 1, and FIGS. 3 and 4 are sectional views of an example of the layer structure of the optical information recording medium. FIGS. 5, 5 and 6 are perspective views of an example of the cartridge.

In the figure, 1 is a transparent substrate made of synthetic resin, 2 is an opening,
3 is a hub, 4 is a flange portion, 5 is a fitting claw, 6 is a protrusion, 7
Is a recording layer, 8 is a hard coat, 9 is a hard coat, 10
Is an adhesive, 11 is a spacer, and 12 is a screwdriver recess. The form of the recording medium of the present invention includes one in which a recording layer is formed on a single substrate and one in which the recording layer is attached to the inside with an adhesive or a spacer.

FIG. 1 is a sectional view showing an example of an optical information recording medium in which a recording layer is formed on a single substrate. A recording layer 7 and a hard coat 8 are provided on the substrate 1, and the back surface of the substrate 1 is provided. Hard coat 9 is also provided. 3 and 4 are cross-sectional views showing an example of an optical information recording medium in which recording layers are laminated inside. 3 shows an air sandwich structure in which the recording layer 7 formed on the substrate 1 is placed inside and the recording layer 7 sides are opposed to each other via a spacer 11, and FIG. 4 is shown in FIG. This is referred to as a solid pasting structure in which the layers are stuck together.

The optical information recording medium of the present invention is an optical information recording medium in which a recording layer 7 is provided on a disk-shaped transparent substrate 1 made of synthetic resin having an opening 2 in the center. , Various forms of substrates (medium) as shown in FIGS. 1, 3, and 4.
From the flange portion 4 along the surface of the substrate 1 to the opening 2 in the central portion of 1 and the fitting claw 5 which is inserted into the opening 2 in the central portion of the substrate 1 in a substantially loose manner. The removable hub 3 is attached.

When mounting / removing the hub 3, the positional relationship between the hub 3 and the substrate 1 must be accurately fixed. For this reason, it is desirable to provide a pair of grooves (projections) and projections 6 (grooves) in the substrate 1 and the hub 3 as shown in FIGS. 1 and 2, for example. The hub 3 has a plurality of fitting claws 5 arranged in a cylindrical shape as shown in FIG. 1 and FIG.
A general structure is such that the inner periphery of the fitting claw is closely contacted, but as shown in FIG. 3, a flange member having a screwdriver recess 12 and the like is screwed into the inside of the fitting claw 5 to screw the fitting claw 5 into the fitting claw 5. To expand outward, or as shown in FIG.
The method such as fitting a tapered diameter expanding jig from the opposite side is arbitrary.

It is desirable that the user can easily attach / detach it when using it, but a simple jig may be used to secure sufficient strength and accuracy. The hub material and dimensions should be made of a magnetic material so that the magnetic clamping force between the hub and the spindle complies with, for example, the international standard (ISO / IEC9171-1) as much as possible, but the dimension details may vary depending on the drive. It is possible.

If the removable hub can be applied to, for example, 100 discs, the cost will be 10 times as high as that of an ordinary adhesive hub. Therefore, if a structure is used with sufficient attention to ensure the mounting accuracy. Good. The detachable cartridge case according to the present invention is, for example, an international standard (IS
An example of the cartridge defined in O / IEC9171-1) has a structure in which one side in the disc thickness direction can be opened and closed and the shutter portion is removed as shown in FIG. Alternatively, as shown in FIG. 6, a structure in which the shutter portion is removed and the structure can be opened may be possible. It has a structure that allows easy insertion of a disc, and its outer shape only needs to match the drive, and unlike the hub, it does not require strict precision. If there is a window that does not hinder the interaction between the optical head and the disc, the shutter mechanism is not necessary, and it is considered that the shape of the window does not necessarily have to strictly comply with the international standard.

As the substrate 1, glass transparent to laser light or plastic such as polycarbonate, polymethylmethacrylate or amorphous polyolefin is used. The recording layer referred to in the present invention includes not only a single layer for absorbing light and causing an optical change in a minute area to record information, but also includes this recording layer and protecting this layer. It also means the entire multi-layer structure including a layer for adjusting the reflectance, a layer for adjusting the reflectance and the like.

The recording medium of the present invention is not enclosed in a cartridge for long-term storage and handling.
In the case of the single plate disc of FIG.
In the case of the above-mentioned bonded medium, it is desirable to provide the hard coat layer 9 on the outside of the substrate 1 to protect the disc from scratches. Further, the hard coat layer 9 on the outer side of the substrate, which has an antistatic effect, can prevent the adhesion of dust that hinders the incidence of laser light. As a measure of the antistatic effect, the surface resistance of the hard coat layer is preferably 10 ¹² ohm / □ or less.

Further, at the time of long-term storage, if the medium is taken out from the cartridge and several pieces are put together in a simple case with the hub removed, it is also useful from the point of the present invention that the storage cost is saved. The recording medium in the present invention is
It can also be used in drives equipped with a spindle that has its own hub fixing system, but on the other hand, the hub is pre-bonded and sealed in an international standard (ISO /
For compatibility, it is desirable for users to be able to use even a drive for applying discs conforming to IEC9171-1). In any case, the relative positional relationship of the removable hub with respect to the center of the disk and its accuracy are important. When the hub is mounted, it is not preferable that the inner diameter of the hub be larger than the outer diameter of the spindle by more than 50 μm because the eccentricity at the time of disk rotation becomes large. Finally, the distance between the center axis of the disk or the inner diameter of the hub and the center axis of the disk rotation (ideally, the center axis of the spindle) is within 50 μm regardless of how the hub is mounted. The tilt is less than 3 mrad, more preferably 2.
It is preferably 5 mrad or less. For this reason, the difference between the spindle outer diameter and the hub inner diameter is at least 50 mm.
It must be within μm.

[0022]

INDUSTRIAL APPLICABILITY The recording medium of the present invention is useful as a large-capacity document file medium that is inexpensive and does not occupy storage space while ensuring compatibility according to the standard.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an example of an optical information recording medium of the present invention.

FIG. 2 is a perspective view of the hub shown in FIG.

FIG. 3 is a sectional view of an example of a layer structure of an optical information recording medium.

FIG. 4 is a sectional view of an example of a layer structure of an optical information recording medium.

FIG. 5 is a perspective view of an example of a cartridge.

FIG. 6 is a perspective view of an example of a cartridge.

[Explanation of symbols]

 1 Transparent Substrate Made of Synthetic Resin 2 Opening Hole 3 Hub 4 Flange Part 5 Fitting Claw 6 Protrusion 7 Recording Layer 8 Hard Coat 9 Hard Coat 10 Adhesive 11 Spacer 12 Recess for Screwdriver

Claims (7)

[Claims] 1. An optical information recording medium comprising a disk-shaped synthetic resin transparent substrate having an opening in the center and a recording layer provided on the transparent substrate. An optical information recording medium equipped with a detachable hub comprising a fitting claw that stands up from a flange portion along the surface and is inserted into an opening in a central portion of a substrate without substantial looseness. 2. The optical information recording medium according to claim 1, wherein the hub is made of magnetic metal. 3. The optical device according to claim 1, wherein a groove or a protrusion for fixing the detachable hub is formed on the substrate, and a protrusion or a groove corresponding to the groove or the protrusion is formed on the hub. Information recording medium. 4. An optical information recording medium comprising a single substrate on which a recording layer is provided, or two substrates having the recording layer inside and bonded together via an adhesive or a spacer, which is 1800 rpm. It is a medium for recording / reproducing information while rotating at the above-mentioned number of rotations, and has a tilt of 3 mrad or less and an eccentricity of 50 um or less at the time of rotation, which is fixed to a rotary shaft stage of a recording / reproducing apparatus and is removable. An optical information recording medium that is equipped with a hub and a cartridge. 5. The recording layer contains a dye, and the recording layer or the recording layer and the surface of the substrate in contact with the recording layer can be optically detected by a phenomenon of punching, deformation or decomposition by a laser light beam. The optical information recording medium according to claim 4, wherein information is recorded and reproduced by causing a change. 6. The inner diameter of the substrate is larger than the outer diameter of the rotating shaft of the recording / reproducing apparatus and the difference in diameter is less than 50 μm, and the center axis of disk rotation is 5 mm from the center of the inner diameter of the substrate.
The optical information recording medium according to claim 4 or 5, wherein the optical information recording medium has a precision within 0 um and is substantially independent of the position and dimensional precision of the removable hub. 7. The disc with the removable hub having an inner diameter larger than the outer diameter of the recording / reproducing apparatus and a difference in diameter of less than 50 μm, and the central axis of disc rotation being mounted with the removable hub. 7. The center axis of rotation coincides with the center of the inner diameter of the hub with an accuracy within 50 μm, and is substantially independent of the dimensional accuracy of the inner diameter of the substrate. Optical information recording medium.