JPH0281380A - Adapter for single-sided information recording disk - Google Patents

Abstract

PURPOSE:To manufacture an inexpensive single-sided information recording disk by providing a buffer soft layer at a part corresponding to the collecting part of the program of the single-sided information recording disk. CONSTITUTION:A substrate 1a has a central hole 1b of the diameter approximately equal to a central hole 2a of a single-sided information recording disk 2 and thickness (t), weight and rotation moment are equal to those of the single- sided information recording disk 2. The single side of the substrate 1a has a buffer soft layer 1c at the part corresponding to an information signal recording layer 2b of the single-sided information recording disk 2. The buffer soft layer 1c sticks the material to form in a sheet shape a low foaming body such as polypropylene and urethane, and the unwoven fabric and viscoelastic substance such as rubber, or applies as a liquid-shaped substance and solidifies this. Thus, it is not necessary to provide a dummy substrate on purpose when the information quantity to be recorded is small and the recording only to the single side is sufficient.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to an adapter used in combination with a single-sided information recording disk.

BACKGROUND ART Information recording disks such as optical video disks are manufactured by bonding two circular substrates, at least one of which has a signal recording layer, with the signal recording layer on the inside. For long-term recording, a signal recording layer is provided on each of these two circular substrates, and for short-term recording, a signal recording layer is provided on only one circular substrate, and the other circular substrate is provided with a signal recording layer. A dummy substrate without a signal recording layer is used. The reason for providing the dummy board is that commercially available disc players have spindle motors that are compatible with the weight and moment of inertia of the double-sided information recording disc, which is made up of two circular boards each provided with a signal recording layer. This is also because a disk clamp mechanism is provided that is suitable for the thickness of the disk.

In this way, even when the amount of information to be recorded is small and recording can be done on only one side, it is necessary to take the trouble to provide a dummy substrate and attach it firmly to all the circular substrates having signal recording layers to create a product. This has led to an increase in cost due to the material cost and manufacturing cost of the dummy board, as well as the work required to bond the two circular boards together.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and its object is to provide an adapter that enables the production of inexpensive single-sided information recording discs.

The adapter according to the present invention has a disk shape as a whole and can be concentrically connected to a single-sided information recording disk, and has a buffer flexible layer on its main surface at least in a portion corresponding to the program recording section of the single-sided information recording disk. It is characterized by

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

FIG. 1(a) and crest) show an adapter 1 as an embodiment of the present invention, and FIG. 2 (ω and crest) shows a single-sided information recording disc 2 to which the adapter is attached.

As shown in FIG. 2 (ω and peaks), the single-sided information recording disk 2 has a disk shape as a whole, and is composed of one transparent resin substrate 2C having a center hole 2a and an information signal recording layer 2b provided on one side thereof. Consists of. Preferable materials for the substrate 2C include, for example, polycarbonate, polystyrene, propylene, and acrylic.

Further, on the information signal recording layer 2b, a protective layer 2d for protecting the information signal recording layer is formed by painting or vapor deposition to a thickness of, for example, 20 to 30 μ/m.

The diameter of the single-sided information recording disk 2 is, for example, 8 inches (approximately 20(1)).

On the other hand, as shown in FIG. 1 (Tada and Yama), the adapter l is also disc-shaped and consists of a substrate 1a made of transparent resin similar to the substrate 2C of the single-sided information disk 2, and has a diameter similar to that of a single-sided information recording disk. It is 8 inches, which is equal to the diameter of 2. The substrate 1a has a center hole 1b having approximately the same diameter as the center hole 2a of the single-sided information recording disk 2, and its thickness t1, weight, and moment of inertia are equal to those of the single-sided information recording disk 2. A buffer flexible layer 1c is provided on one side of the substrate 1a in a portion corresponding to the information signal recording layer 2b of the single-sided information recording disk 2.

The buffer flexible layer 1c is made by pasting a sheet made of a low-foam material such as polypropylene or urethane, a nonwoven fabric, or a viscoelastic material such as rubber, or by applying these in a liquid form and solidifying it. Become. As shown in the figure, the buffer flexible layer IC is formed in an annular shape, and its thickness tb is 0.2
~0.4IIIlal, and the inner diameter and outer diameter are 86 m/11. It is 196m/m.

As shown in FIG. 3, the adapter 1 is used by being attached concentrically to the single-sided information recording disk 2. As mentioned above, the thickness, weight, and moment of inertia of the adapter 1 are 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 1.31111.
1, and the total thickness T when both are overlapped is 2°8-/11, including the thickness of the buffer flexible layer IC. This thickness is equal to the thickness of a double-sided information recording disk made by laminating two circular substrates each provided with a signal recording layer. In addition, a single-sided information recording disc 2 and an adapter 1
The moment of inertia of the combined body is also equal to the moment of inertia of the double-sided information recording disk. Because of this configuration, the single-sided information recording disc 2 can be played on a disc player for playing double-sided information recording discs.

Furthermore, as shown in FIG.
A buffer flexible layer IC is interposed between the layers a. If this buffer flexible layer IC is not provided, if a hard foreign object such as sand gets caught between the single-sided information recording disk 2 and the adapter 1 when they are stacked together, the
The protective layer 2d, which is as thin as .mu./m, may be peeled off by this foreign material, and furthermore, the information signal recording layer 2b may be damaged. In the adapter according to the present invention, since the above-mentioned buffer flexible layer IC is provided, when the adapter is combined with the single-sided information recording disk 2, foreign objects will sink into this soft buffer flexible layer IC, and the single-sided information recording disk 2 There is no fear that the protective layer 2d and information signal recording layer 2b will be damaged.

Further, as shown in FIG. 3, the adapter 1 is attached to the back side of the information reading surface of the single-sided information recording disc 2, that is, the label side.As mentioned above, the adapter 1 is made of transparent resin and has a buffer. Since the flexible layer IC 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. Note that the entire adapter 1 does not need to be transparent, and only the portion that does not correspond to the program recording section, that is, the portion that corresponds to the label, needs to be transparent.

Further, the buffer flexible layer IC may be provided not only on one side of the adapter 1 as described above, but also on both sides. By providing buffer flexible layer ICs on both sides, it is possible to connect the adapter 1 to the single-sided information recording disk 2 without checking the front and back sides of the adapter 1, improving operability.

Figure 3 shows the above-mentioned single-sided information recording disk 2 and adapter 1.
This figure shows a state in which these are placed on the turntable 3 in a layered manner. 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 mentioned above, the portion of the adapter 1 excluding the buffer flexible layer 1c, that is, the substrate 1a, has the same shape as the single-sided information recording disk 2, and with this configuration, the substrate 2C of the single-sided information recording disk 2 is molded. It becomes possible to mold the substrate 1a using a processing machine, for example, an injection molding machine,
It becomes easier to reduce costs.

Further, the adapter 1 shown in FIGS. 1 to 3 is coupled to the single-sided information recording disk 2 by the frictional force between the buffer flexible layer IC and the single-sided information recording disk 2.
By forming suction recesses 1d on the surface of the buffer flexible layer IC as shown in the figure (■ and crests), the state in which the adapter 1 is locked to the single-sided information recording disk 2 becomes more solid. Note that the means for locking the single-sided information recording disk 2 and the adapter 1 to each other is not limited to such suction recesses, but, for example, a locking member protruding from the main surface of either the single-sided information recording disk 2 or the adapter 1 is used. It may be configured such that a locking pawl is formed and a locking recess or hole into which the locking pawl fits is formed on the other side. In this case, the locking recess does not need to be specially provided, and the center holes 2a, lb of the single-sided information recording disk 2 and the adapter 1, or their outer peripheries may be used instead of the locking recess.

Effects of the Invention As described in detail above, the adapter for a single-sided information recording disk according to the present invention is removably connected to the single-sided information recording disk and concentrically stacked on top of it, so that a double-sided performance recording disk can be attached to the single-sided information recording disk. Since the weight, moment of inertia, and thickness are equal to that of Since it consists only of a substrate, the cost is significantly reduced compared to conventional single-sided information recording disks, which are manufactured by pasting dummy substrates on all of the signal recording circular substrates.

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

Therefore, even if a hard foreign object such as sand gets caught between the adapter and the single-sided information recording disk, the foreign object will sink into the soft buffer layer, and the information on the single-sided information recording disk will be There is no fear that the signal recording layer and the protective layer that protects it will be damaged.

[Brief explanation of the drawing]

Fig. 1 (ω and +b) is a plan view and a vertical cross-sectional view of a disk-shaped adapter as an embodiment of the present invention, and Fig. 2 (field and mountain) is one side to which the disk-shaped adapter shown in Fig. 1 is coupled. Each plan view and vertical cross-sectional view of the information recording disk, FIG.
Fig. 4 is a vertical cross-sectional view showing a state in which the disc-shaped adapter and the single-sided information recording disk shown in Fig. 2 are coupled to each other and clamped on a turntable, Fig. 4 +a) and crest) are the first
FIG. 4 is a diagram showing a configuration in which a suction recess for suctioning a single-sided information recording disk is formed in the buffer flexible layer of the disc-shaped adapter shown in FIGS. Explanation of symbols of main parts 1...Disc-shaped adapter IC...Buffer flexible layer 2...Single-sided information recording disk

Claims (5)

[Claims] (1) A disc-shaped adapter that is attached concentrically to a single-sided information recording disc, characterized by having a buffer flexible layer on its main surface at least in a portion corresponding to the program recording section of the single-sided information recording disc. Disk-shaped adapter. (2) The disk-shaped adapter according to claim 1, wherein the portion excluding the buffer flexible layer has the same shape as the single-sided information recording disk. (3) The disc-shaped adapter according to claim 1 or 2, wherein at least a portion not corresponding to the program recording section is transparent. (4) The disc-shaped adapter according to any one of claims 1 to 3, wherein the buffer flexible layer is provided on both sides. (5) Any one of claims 1 to 4, wherein a suction recess is formed on the surface of the buffer flexible layer.
The disc-shaped adapter described.