JPH09115260A - Disk-like recording carrier for recording of reproducing by optical means, protection film stuck to it and housing case for it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a protection film stuck to a label information surface side preventing recording information from being destructed due to damage of the label information surface side by providing a protection film on the label information surface side of a disk-like recording medium. SOLUTION: A CD 10 is provided with the label information surface side 11 and a laser read surface side 12, and the protection film 20 is stuck to the label information surface side 11. The film 20 is provided with a through hole 21, and a peeling sheet 22 containing the through hole 21 is stuck to over all surface of the protection film 20. Division lines 23 are formed on the peeling sheet 22, and a housing case 30 is provided with a housing part 31 and a cap part 32. The housing part 31 is provided with a housing recessed part 31a, and a fixed projection part 33 is formed on the housing recessed part 31a, and the fixed projection part 33 is provided with a cylindrical part 35 for forming a hole 34, and slits 36 are formed in the open edge part of the hole 34, and a raised step part 37 is formed around the cylindrical part 35, and a spacer 40 of a shape excluded of the raised step part 37 is provided on the housing recessed part 31a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc-shaped record carrier for recording or reproduction by optical means, a protective film attached to the disc-shaped record carrier, and a housing case for the disc-shaped record carrier, and more particularly to a compact disc or a CD-ROM. The present invention relates to a disc-shaped record carrier, a protective film attached to the disc-shaped record carrier, and a disc-shaped record carrier housing case in which a protective layer is provided on a surface (hereinafter referred to as “CD”) to prevent damage to the surface. .

[0002]

2. Description of the Related Art A CD, which is a disk-shaped record carrier for recording or reproducing by optical means, is generally manufactured in the following steps. (1) Injection molding Using a pre-manufactured stamper die, a plastic material (polycarbonate) dissolved in the stamper mounted in the die is injected to obtain a thickness of 1.
Depth of 0.1 mm on the surface of a transparent disk 2 mm in diameter and 120 mm in diameter.
A transparent clear disk having a μm depression is formed. (2) Formation of reflective film and protective film Aluminum is vacuum-deposited on the signal surface of the molded clear disk to form a reflective film. The reflective film is thin and easily damaged,
Also, since it oxidizes, a plastic protective film is formed on it.

[0003]

The CD manufactured as described above generally has a semi-permanent life since the signal surface, that is, the laser reading surface is covered with the above-mentioned polycarbonate in a sandwich shape. Is believed to be. In other words, even if the laser reading surface is scratched for some reason, it has a sufficient thickness of 1 mm or more to withstand polishing with an abrasive such as compound. It can be possible.

However, on the surface opposite to the laser reading surface, on which music or other so-called label information is printed (hereinafter referred to as "label information surface"), only the plastic protective film is formed as described above. And its thickness is about 25 μm. In other words, since the protective layer on the label information surface is very thin as described above, when handling the surface, it may hit the object, drop the object from above, or drag it with the object on it to cause scratches. There is a problem that a signal surface on which information is recorded is often scratched and the recorded information is destroyed so that the information cannot be reproduced.

Therefore, an object of the present invention is to provide a protective layer on the label information side to prevent recorded information from being destroyed by damage on the label information side. Another object of the present invention is to provide a protective film which is attached to the label information surface side. Still another object of the present invention is to provide a storage case for a disc-shaped record carrier that enables accurate attachment when a protective film is attached to the label information surface side.

[0006]

Means for solving the above problems and achieving the objects are as follows. The first means is a disc-shaped record carrier for recording or reproduction by optical means, which is formed separately from the record carrier on the surface opposite to the laser reading surface. A disk-shaped record carrier for recording or reproducing by optical means, which is provided with a protective layer.

In the second means, a protective film is attached to the surface opposite to the laser reading surface to protect the disk-shaped record carrier, and the protective film records information. A protective film to be attached to a disk-shaped record carrier for recording or reproduction by optical means, characterized in that it is formed in a shape capable of covering a portion.

In the third means, a protective film is attached to the surface opposite to the laser reading surface to protect the disk-shaped record carrier, and has a circular through hole in the center. , A protective film formed in substantially the same shape as the disk-shaped record carrier to be stuck, a layer of an adhesive formed on one surface of the protective film, and the entire surface of the layer of the adhesive. A release paper that is attached and covers the protective film including the through holes, and the release paper is formed with a required number of dividing lines in a radial direction from the center. And a protective film attached to a disc-shaped record carrier for recording or reproduction by optical means.

The fourth means is a case for accommodating a disk-shaped record carrier for recording or reproduction by optical means, the case comprising a record carrier accommodating portion,
A lid part pivotally attached to the record carrier accommodating part so as to be swingable, and the record carrier accommodating part is formed to protrude into a central part of the accommodating concave part and has elasticity. A fixed protrusion that expands and contracts in the radial direction to fix the record carrier; and a raised step that is formed around the fixed protrusion so that the laser reading surface of the record carrier does not abut the bottom of the accommodating recess. A storage case for a disk-shaped record carrier, comprising: a filling plate fitted in the storage recess and having an upper surface flush or substantially flush with the upper surface of the raised step portion.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The protective layer can be obtained by applying a protective film, forming a protective material in layers by spraying or coating.
The outer shape of the protective film is generally the same as that of the CD,
It is formed in a shape capable of covering the signal surface on which information is recorded. The material can be plastic sheet (including film), paper (including Japanese paper, western paper, synthetic paper, etc.), cloth (including woven cloth, non-woven cloth, etc.), veneer with thinly cut wood, etc. Not limited. If the protective film can be written with a writing instrument, it will be convenient for organizing later. Advertising advertisements and necessary items may be printed in advance.

As a sticking method, an adhesive is applied,
Or, there are some materials that have adhesive strength, but C
There is no particular limitation as long as it can be attached to D. It is convenient to use a peelable adhesive because it can be easily replaced if it is scratched.

The thickness of the protective film is not particularly limited as long as it can be used in a reproducing device or the like. Moreover, the weight is preferably within 3 g.
If the weight exceeds 3 g, the desired rotation of the disk cannot be achieved as planned due to inertia, which adversely affects the reproduction of recording.

The protective film is usually formed in a wide annular shape (donut shape) and is attached to the label information side of the CD. If the position shifts during attachment, some parts will not be protected. Therefore, when the protective film is attached, it can be attached accurately by using the CD housing case.

That is, the CD storage case has a storage portion for the CD, which is a record carrier, and a lid portion pivotably attached to the storage portion. The accommodating portion is formed so as to protrude in the center of the accommodating recess and the accommodating recess, and is provided with a fixing protrusion that has elasticity and expands and contracts in the radial direction to fix the record carrier. Further, a raised step portion is formed around the fixed protrusion so that the laser reading surface of the CD does not come into contact with the bottom surface of the accommodating recess.

Therefore, when the protective film is placed in the accommodating recess using the accommodating case having the above structure as it is, a gap is formed between the protective film and the label information surface of the CD because the protective film is usually thin. The protective film cannot be attached. Therefore, the protective film can be brought into close contact with the label information surface of the CD by inserting a filling plate whose upper surface is flush or substantially flush with the upper surface of the raised step portion into the accommodating concave portion to raise the protective film. .

In this way, the protective film is placed in the accommodating recess with the adhesive surface facing upward, the label information surface side of the CD is brought into contact with the protective film side, and the laser reading surface side is flexible like a finger or cloth. Then, the protective film is affixed to the label information side by pressing with the one having. Examples of the material of the filling plate include sponge, paper, and solidified foam beads (Styrofoam, etc.).

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail based on the embodiments shown in the drawings. FIG. 1 is a partially enlarged sectional view of a state in which a protective film is attached to the label information side of a CD. Code 10
Indicates a CD. CD10 is injection-molded from polycarbonate to form a transparent clear disk in which a required number of recesses with a depth of 0.1 μm are formed on the surface of a transparent disk with a thickness of approximately 1.2 mm and a diameter of 120 mm, and then aluminum is applied to the signal surface. Is a known film in which a reflective film is formed by vacuum vapor deposition, and a plastic protective film is further formed thereon, and detailed description thereof will be omitted.

The CD 10 has a label information surface side 11 and a laser reading surface side 12, and the label information surface side 11
The protective film 20 made of plastic is an adhesive (not shown)
Is pasted through. The protective film 20 has a thickness of about 0.25.
mm, weight about 3 g.

FIG. 2 is an exploded perspective view showing a method of attaching the protective film. When the protective film 20 is attached, a plastic housing case 30 as shown in FIG. 2 can be used to prevent displacement when the protective film 20 is attached. Code 3
Reference numeral 0 denotes a plastic housing case, which includes a housing portion 31 and a lid portion 32. The lid portion 32 is pivotally attached to one end of the housing portion 31 and can swing to open and close. Accommodation part 31
Is the accommodating recess 31a formed in conformity with the shape of the CD.
have. A fixing protrusion 33 is formed in the center of the accommodating recess 31a so as to correspond to the center hole of the CD 10.

The fixed protrusion 33 has a cylindrical portion 35 having a circular hole 34 formed in the center thereof. A required number of slits 36 are radially formed from the rim of the hole 34, so that the cylindrical portion 35 can be elastically expanded and contracted in the radial direction. An annular raised step portion 37 is formed around the cylindrical portion 35 so that the laser reading surface side 12 does not contact the bottom surface of the accommodating recess 31a when the CD is fitted in the cylindrical portion 35. Prevents damage.

That is, since the CD 10 is lifted from the bottom surface of the accommodation recess 31a by the raised step portion 37, the protective film cannot be attached if the distance between the surface of the raised step portion 37 and the bottom surface of the accommodation recess 31a is larger than the thickness of the protective film 20. Therefore, a spacer 40, which is a filling plate having a shape excluding the raised step portion 37, is fitted into the accommodation recess 31a so that the upper surface of the raised step portion 37 and the upper surface of the spacer 40 are flush with each other. Then, the protective film 20 is placed on the accommodating recess 31a with the adhesive surface facing upward, and the protective film 2 is placed on the cylindrical portion 35.
Align hole 21 of 0 and put.

An annular groove is formed in the center of the label information surface 11 of the CD 10. When the protective film 20 is attached to the label information surface 11 by the air in the groove portion, an air pocket may be formed between the protective film 20 and the label information surface 11, so that the groove portion has the same shape as the groove portion. It is also possible to prevent the formation of air pockets by embedding the filling ring 50 having a diameter and the padding portion of the protective film.

The structure of this protective film will be further described.
The protective film 20 has a circular through hole 21 into which the cylindrical portion 35 fits, and is formed in substantially the same shape as the disk-shaped record carrier to be stuck. An adhesive layer (not shown) is formed on one surface of the protective film 20. A release paper 22 including a through hole 21 and covering the protective film 20 is attached to the entire surface of the pressure-sensitive adhesive layer. The release paper 22 has a required number of dividing lines 23 formed in the radial direction from the center.

Accordingly, when the through hole 21 is fitted into the cylindrical portion 35 with the protective film 20 on the lower side and the release paper 22 on the upper side, FIG.
As shown in (4), the release paper 22 is flipped upward, so that the release paper 22 can be easily peeled off by pinching the flipped up portion.

After peeling the release paper 22, the label information surface side 11 of the CD is brought into contact with the protective film 20 side, and the laser reading surface side 12 is pressed by a flexible object such as a finger or cloth. The protective film 20 is attached to the label information surface side 11.
The present invention is not limited to the embodiments and examples of the invention described above, and various modifications can be made within the scope of the claims.

[0026]

According to the present invention, which has the above-mentioned structure and the protective layer is provided on the label information side, it is possible to prevent the recorded information from being destroyed by the damage on the label information side. Further, it is possible to provide a protective film that can be accurately attached to the label information side. Further, it is possible to provide a case for accommodating a disc-shaped record carrier, which enables accurate attachment when the protective film is attached to the label information surface side.

[Brief description of the drawings]

FIG. 1 is a partially enlarged cross-sectional view of a state in which a protective film is attached to the label information side of a CD.

FIG. 2 is an exploded perspective view showing a method of attaching a protective film.

FIG. 3 is a perspective view of a main part showing how the release paper is turned up.

[Explanation of symbols]

 10 CD 11 Label Information Side 12 Laser Reading Side 20 Protective Film 21 Through Hole 22 Release Paper 30 Storage Case 31 Storage Case 32 Cover 33 Fixed Projection 37 Raised Step 40 Spacer 50 Filling Ring

Claims (4)

[Claims] 1. A disc-shaped record carrier for recording or reproduction by optical means, the record carrier having a protective layer formed separately from the record carrier on a surface opposite to a laser reading surface. A disc-shaped record carrier for recording or reproducing by optical means, which is provided. 2. A protective film for protecting a disc-shaped record carrier, which is adhered to a surface opposite to a laser reading surface,
This protective film is formed in a shape capable of covering a portion where information is recorded, which is adhered to a disc-shaped record carrier for recording or reproduction by optical means. 3. A disk-shaped recording film, which is a protective film adhered to a surface opposite to a laser reading surface to protect a disk-shaped record carrier and has a circular through hole in a central portion thereof. The protective film formed in substantially the same shape as the carrier, the adhesive layer formed on one surface of the protective film, and the entire surface of the adhesive layer are attached,
And a release paper covering the protective film including the through hole, wherein the release paper is formed with a required number of dividing lines in the radial direction from the center. Protective film attached to a disc-shaped record carrier for recording or reproduction by. 4. A case for accommodating a disk-shaped record carrier for recording or reproduction by optical means, the case comprising a record carrier accommodating portion and a swingable pivot member in the record carrier accommodating portion. The record carrier accommodating portion is formed by projecting at a central portion of the accommodating recess and the accommodating recess, and is elastic and expands or contracts in a radial direction to expand the record carrier. A fixed protruding portion to be fixed, a raised step portion formed around the fixed protruding portion so that the laser reading surface of the record carrier does not come into contact with the bottom surface of the accommodating recess, and the upper surface fitted into the accommodating recess has an upper surface as described above. A storage case for a disk-shaped record carrier, comprising: a filling plate which is flush or substantially flush with the upper surface of the raised step portion.