JPH0810544B2 - Adapter for single-sided information recording disk - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an adapter used in combination with a single-sided information recording disk.

BACKGROUND ART Information recording discs such as optical video discs are manufactured by laminating two circular substrates, at least one of which has a signal recording layer, so that the signal recording layers are inside. In the case of recording for a long time, a signal recording layer is provided on each of these two circular substrates, and when recording for a short time, the signal recording layer is provided only on one circular substrate and the other circular substrate is A dummy substrate having no signal recording layer has been used. The reason for providing the dummy substrate is that a commercially available disc player has a spindle motor adapted to the weight and moment of inertia of a double-sided information recording disc formed by combining two circular substrates each provided with a signal recording layer, Further, it is because a disc clamp mechanism adapted to the thickness of the disc is provided.

Thus, even if the amount of information to be recorded is small and only one side needs to be recorded, it is necessary to purposely provide a dummy substrate and fix it to all circular substrates having a signal recording layer to make a product, Since the material cost and manufacturing cost of the dummy substrate and the work for bonding the two circular substrates are required, the cost is increased.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points,
The purpose thereof is to provide an adapter which enables the production of an inexpensive single-sided information recording disk.

The adapter according to the present invention is a single-sided information recording disk adapter used for playing a single-sided information recording disk in a disk player for playing a double-sided information recording disk, wherein the single-sided information recording disk adapter has a disk shape. A main surface of the single-sided information recording disk has a buffer flexible layer at a portion corresponding to the recording layer, and the single-sided information recording disk may be concentrically attached to one surface of the single-sided information recording disk via the buffer flexible layer. It has a feature.

Embodiment Hereinafter, a single-sided information recording disk adapter as an embodiment of the present invention will be described with reference to the accompanying drawings.

1 (a) and 1 (b) show an adapter 1 as an embodiment of the present invention, and FIGS. 2 (a) and 2 (b) show a single-sided information recording disk 2 to which the adapter is added.

As shown in FIGS. 2 (a) and 2 (b), the single-sided information recording disk 2 has a disk shape as a whole, and has a central hole 2a, and one sheet of transparent resin on which an information signal recording layer 2b is provided. It consists of the substrate 2c. As the material of the substrate 2c, for example, polycarbonate, polystyrene, propylene, acrylic, etc. are preferable. Further, a protective layer 2d for protecting the information signal recording layer 2b is formed on the information signal recording layer 2b by painting or vapor deposition to have a thickness of, for example, 20 to 30 μ / m. The diameter D of the single-sided information recording disk 2 is, for example, 8 inches (about 20 cm).

On the other hand, as shown in FIGS. 1 (a) and 1 (b), the adapter 1 is also disc-shaped and is made of a substrate 1a made of a transparent resin similar to the substrate 2c of the one-sided information disc 2 and has a diameter of one-sided information. It is equal to the diameter of the recording disk 2 and is 8 inches. The substrate 1a has a central hole 1b having substantially the same diameter as the central hole 2a of the single-sided information recording disk 2, and its thickness t, weight and moment of inertia are equal to those of the single-sided information recording disk 2. On one surface of the substrate 1a, a buffer flexible layer 1c is provided at a portion corresponding to the information signal recording layer 2b of the single-sided information recording disk 2. Cushioning flexible layer
1c is formed by adhering a sheet made of a low-foam material such as polypropylene or urethane and a non-woven fabric and a viscoelastic material such as rubber, or by applying these in a liquid state and solidifying the same. As shown in the figure, the buffer flexible layer 1c is formed in an annular shape, its thickness tb is 0.2 to 0.4 m / m, and the inner and outer diameters are the information signal recording layer of the single-sided information recording disk 2.
86m / m and 196m / m respectively to correspond to the inner and outer diameters of 2b.

As shown in FIG. 3, the adapter 1 is concentrically attached to the single-sided information recording disk 2 and used. As described above, the thickness, weight and moment of inertia of the adapter 1 are used to determine the single-sided information recording disk 2. By making it equal to that of
It becomes easy to set the overall thickness T, weight and moment of inertia when the single-sided information recording disk and the adapter are combined. Further, the thickness t of each substrate of the single-sided information recording disk 2 and the adapter 1 is, for example, 1.2 to 1.3 m / m,
The total thickness T when both are superposed is 2.8 m / m, including the thickness of the buffer flexible layer 1c. This thickness is equal to the thickness of a double-sided information recording disc formed by bonding two circular substrates each provided with a signal recording layer. The moment of inertia of the combined body of the single-sided information recording disk 2 and the adapter 1 is also equal to the moment of inertia of the double-sided information recording disk. Due to this structure, the single-sided information recording disk 2 can be played by the disk player for playing the double-sided information recording disk.

Further, as shown in FIG. 3, when the single-sided information recording disk 2 and the adapter 1 are superposed on each other, these respective substrates 2c, 1a
The buffer flexible layer 1c is interposed between the two. If the buffer flexible layer 1c is not provided, if a hard foreign object such as sand is sandwiched between the single-sided information recording disk 2 and the adapter 1 when they are superposed on each other, it is as thin as 20 to 30 μ / m. The protective layer 2d may be peeled off by the foreign matter, and the information signal recording layer 2b may be damaged. In the adapter according to the present invention, since the buffer flexible layer 1c described above is provided, when it is combined with the single-sided information recording disk 2, foreign matter is embedded in the soft buffer flexible layer 1c, and the single-sided information recording disk 2 is formed. There is no possibility of damaging the protective layer 2d and the information signal recording layer 2b.

Further, as shown in FIG. 3, the adapter 1 is added to the back surface of the information reading surface of the single-sided information recording disk 2, that is, the label side. Since the flexible layer 1c is provided only in the part corresponding to the program recording part excluding the part corresponding to the label, the label of the single-sided information recording disc 2 can be read even if the single-sided information recording disc 2 and the adapter 1 are combined. The entire adapter 1 does not need to be transparent, and only the portion that does not correspond to the program recording unit, that is, the portion that corresponds to the label, may be transparent.
Further, the above-mentioned cushioning soft layer 1c may be provided not only on one side of the adapter 1 as described above but also on both sides. By providing the buffer flexible layers 1c on both sides, it is possible to combine the adapter 1 with the single-sided information recording disk 2 without checking the front and back sides, and the operability is improved.

FIG. 3 shows a state in which the single-sided information recording disk 2 and the adapter 1 described above are superposed on each other and placed on the turntable 3. In this state, clamping is performed by the clamper 4, and the optical pickup 5 reads the recorded information while moving along the recording surface of the single-sided information recording disk 2.

As described above, the adapter 1 has the same shape as that of the single-sided information recording disk 2 except for the buffer flexible layer 1c, that is, the substrate 1a. With this configuration, the substrate 2c of the single-sided information recording disk 2 is formed. The substrate 1a can be molded using a processing machine such as an injection molding machine, and the cost can be easily reduced.

The adapter 1 shown in FIGS. 1 to 3 is connected to the single-sided information recording disk by the frictional force between the buffer flexible layer 1c and the single-sided information recording disk 2.
As shown in FIGS. 3A and 3B, by forming the suction concave portion 1d on the surface of the buffer flexible layer 1c, the locked state of the adapter 1 with respect to the single-sided information recording disk 2 becomes more solid. The means for locking the single-sided information recording disk 2 and the adapter 1 to each other is not limited to the suction concave portion, and, for example, a member protruding from the main surface of either the single-sided information recording disk 2 or the adapter 1. A structure may be used in which a stop claw is formed and a locking recess or hole into which the locking claw fits is formed on the other side. In this case, it is not necessary to provide the locking recess specifically, and the center holes 2a, 1b of the single-sided information recording disk 2 and the adapter 1 or the outer peripheral edge thereof may be used instead of the locking recess.

As described in detail above, in the adapter for a single-sided information recording disk according to the present invention, the single-sided information recording disk is detachably and concentrically overlapped with each other to form a double-sided performance recording disk. Since the same weight, moment of inertia, and thickness are given, a single-sided information recording disc can be played by a disc player for playing a double-sided information recording disc. Such a single-sided information recording disc is a single substrate having a signal recording layer. Since it is composed of only the signal recording circular substrate, the cost is significantly reduced as compared with the conventional single-sided information recording disc which is manufactured by attaching the dummy substrate to all of the signal recording circular substrates.

Furthermore, in the adapter for a single-sided information recording disk according to the present invention, the buffer flexible layer is provided on the main surface thereof at least in the portion corresponding to the program recording portion of the single-sided information recording disk.

Therefore, even if a hard foreign matter such as sand is sandwiched between these when the adapter is put on the single-sided information recording disk, the foreign matter will be embedded in the soft buffer flexible layer, and the information signal of the single-sided information recording disk will be recorded. There is no concern that the recording layer and the protective layer that protects it will be damaged.

[Brief description of drawings]

1 (a) and 1 (b) are a plan view and a vertical sectional view, respectively, of a disk-shaped adapter as an embodiment of the present invention, and FIGS. 2 (a) and 2 (b) are the disk-shaped adapters shown in FIG. FIG. 3 is a plan view and a vertical cross-sectional view of a single-sided information recording disk to which the disk is connected, and FIG. 3 is a state in which the disk-shaped adapter and the single-sided information recording disk shown in FIGS. FIGS. 4A and 4B are views showing the structure of the disk-shaped adapter shown in FIGS. 1 and 3 in which a buffering flexible layer is formed with a suction recess for suctioning a single-sided information recording disk. FIG. Explanation of symbols of main parts 1 …… Disc-shaped adapter 1c …… Buffer flexible layer 2 …… Single-sided information recording disk

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masayuki Uno 2680 Nishi Hanawa, Tatomi-cho, Nakakoma-gun, Yamanashi Pioneer Video Co., Ltd. Incorporated (72) Inventor Kenichi Ishiguro 2680 Nishi Hanawa, Tatomi-cho, Nakakoma-gun, Yamanashi Pioneer Video Corp. (56) Reference JP-A-52-29701 (JP, A)

Claims (5)

[Claims] 1. A single-sided information recording disk adapter used for playing a single-sided information recording disk in a disk player for playing a double-sided information recording disk, wherein the single-sided information recording disk adapter has a disk shape. A main surface of the single-sided information recording disk has a buffer flexible layer at a portion corresponding to the recording layer, and the single-sided information recording disk may be concentrically attached to one surface of the single-sided information recording disk via the buffer flexible layer. Characteristic single-sided information recording disk adapter. 2. The adapter for a single-sided information recording disk according to claim 1, wherein a portion excluding the buffer flexible layer has the same shape as that of the single-sided information recording disk. 3. The adapter for a single-sided information recording disk according to claim 1, wherein at least a portion not corresponding to the recording layer is transparent. 4. The cushioning flexible layer is provided on both surfaces, as claimed in any one of claims 1 to 3.
Adapter for single-sided information recording disk described. 5. The adapter for a single-sided information recording disk according to claim 1, wherein a suction concave portion is formed on the surface of the buffer flexible layer.