JPH01105370A - Adapter for single surface information recording disk - Google Patents

Abstract

PURPOSE:To highly accurately and easily attain the alignment between a disk and an adapter by providing an electrostatic adhesive layer on a part of a main surface which can be coupled with the disk, and providing a centering projection to engage the center hole of the disk. CONSTITUTION:An adapter 1 has a center hole 1a with a slightly smaller diameter than that of a center hole 2a of a single information recording disk 2, a ringed centering projection 1b to fit into the center hole 2a is protruded at the edge part of the center hole 1a, and the projection 1b performs the alignment of the adapter 1 for the disk 2. Further at the one surface of the adapter 1 to abut on the disk 2, a ringed electrostatic adhesive layer 1d is provided, and the adapter 1 and the disk 2 are mutually coupled by this layer 1d.

Description

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

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 is disk-shaped as a whole and can be coupled concentrically to a single-sided information recording disk, and has an electrostatic adhesive layer on at least a portion of its main surface, thereby coupling to the single-sided information recording disk. The disc is further characterized in that it has a centering protrusion that engages with the center hole of the single-sided information recording disc.

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.

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

The single-sided information recording disk 2 is disc-shaped and consists of one transparent resin substrate having a center hole 2a, and an information signal recording layer 2b is provided on one side of the disk.

On the other hand, the adapter 1 is also formed into a disk shape, and is made of a material having the same or equivalent specific gravity as the single-sided information recording disk 2, and is, for example, entirely transparent. Further, the diameter of the adapter 1 is preferably D, which is equal to that of the single-sided information recording disc 2, and its thickness is also preferably t, which is equal to the thickness of the single-sided information recording disc. In this way, by making the material, diameter, and thickness of the adapter 1 the same as those of the single-sided information recording disc 2, the manufacturing equipment and manufacturing process of the single-sided information recording disc 2 can be almost used when manufacturing the adapter. Manufacturing is easy and costs can be reduced. Moreover, with this configuration, it becomes easy to set the overall thickness, weight, and moment of inertia when the adapter 1 and the single-sided information recording disk 2 are combined with each other.

The adapter 1 preferably has a center hole 1a with a diameter slightly smaller than the diameter of the center hole 2a of the single-sided information recording disk 2, and as shown in FIG. For example, a ring-shaped centering protrusion 1b that fits into the center hole 2a of the recording disk 2 is provided in a protruding manner. Centering protrusion 1
b is for centering the adapter 1 with respect to the single-sided information recording disk 2, but since the center hole 2a of the single-sided information recording disk 2 is used for mutual centering in this way, a special jig is required. High precision without
Centering can be done extremely easily. Note that the centering protrusion 1b is not limited to the annular shape as described above, but may be composed of, for example, three claws arranged in parallel on the same circle at equal pitches.

In addition, as is clear from FIG. 3, the above-mentioned centering protrusion 1
The height h and cross-sectional shape of b are such that when the adapter 1 and the single-sided information recording disk 2 are combined and placed on the turntable 3, the centering portion 3a of the turntable 3 and the centering protrusion 1b are relative to each other. It is set to not interfere.

A ring-shaped electrostatic adhesive layer 1d is provided on one side of the adapter 1 that comes into contact with the single-sided information recording disk 2. The electrostatic adhesive layer 1d is non-adhesive and generates adhesive force through electrostatic adhesion, and the adapter and the single-sided information recording disk 2 are bonded to each other by the electrostatic adhesive layer. Because of the electrostatic adhesion, the adhesion to the single-sided information recording disk 2 does not deteriorate, and the surface of the disk does not become stained. Further, the electrostatic adhesion layer 1d has extremely good removability, and the adapter 1 can be easily attached to and detached from a large number of single-sided information recording disks 2 at frequent intervals.

The electrostatic adhesion layer 1d described above is transparent.

However, the term "transparent" here includes semi-transparent. 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 surface including the label section, and by making the electrostatic adhesion layer 1d transparent, the electrostatic Regardless of the shape and size of the adhesion layer,
Even after the adapter 1 and the single-sided information recording disc 2 are combined, the characters on the label portion of the single-sided information recording disc 2 can be visually checked through the adapter.

In the above embodiment, the electrostatic adhesion layer 1d is formed in an annular shape and is provided only on a part of the adapter 1.
It is not limited to an annular shape, but may be formed in an island shape or a striped shape, and the range may not be limited to only a part of the adapter 1, but may extend over the entire surface of the adapter 1.

Furthermore, it goes without saying that the disc-shaped adapter is not limited to the type of single-sided information recording disc to which it is attached, and can be applied to discs of various diameters, such as compact discs and video discs.

Effects of the Invention As detailed above, the disk-shaped adapter according to the present invention is removably attached to a single-sided information recording disk and concentrically overlapped, thereby giving the single-sided information recording disk the same weight and inertia as a double-sided information recording disk. Since the moment and thickness are imparted, a single-sided information recording disc can be played on a disc player for playing double-sided information recording discs, and such a single-sided information recording disc consists of only one substrate having a signal recording layer. 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, the adapter for a single-sided information recording disk according to the present invention has an electrostatic adhesive layer on at least a portion of its main surface, and is thereby bonded to a single-sided information recording disk.

Therefore, the adhesion to the single-sided information recording disk does not deteriorate, and the disk surface does not get dirty. Furthermore, the electrostatic adhesion layer has extremely good removability, and the adapter can be easily attached to and detached from a large number of single-sided information recording disks frequently.

Furthermore, the adapter for a single-sided information recording disc according to the present invention has a centering protrusion that engages with the center hole of the single-sided information recording disc. Therefore, when the adapter is coupled to a single-sided information recording disk, alignment between the disk and the adapter can be easily and precisely performed.

[Brief explanation of the drawing]

FIGS. 1(a) and (b) are a plan view and a vertical cross-sectional view of a disc-shaped adapter as an embodiment of the present invention, and FIGS. 2(a) and (b) are a single-sided information recording disk to which the adapter is coupled. FIG. 3 is a plan view and a vertical cross-sectional view, respectively, and FIG. 3 is a vertical cross-sectional view showing a state in which the combined adapter and single-sided information recording disk are placed on a turntable. Explanation of symbols of main parts 1... Disc-shaped adapter la, 2a... Center hole 1b... Centering protrusion 1d... Electrostatic adhesion layer 2 ...Single-sided information recording disc 2b...Signal recording layer Applicant Pioneer Corporation

Claims (1)

[Claims] A disk-shaped adapter concentrically coupled to a single-sided information recording disk, having an electrostatic adhesive layer on at least a portion of its main surface, and having a centering protrusion that engages with a center hole of the single-sided information recording disk. A disc-shaped adapter comprising: