JPH09270177A - Optical disk and protective sheet for optical disk - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent damages or deposition of contaminant on the surface of an optical disk without using a special case or the like by applying a protective sheet on an exposed surface of a substrate and a protective film. SOLUTION: The protective sheet 10 for an optical disk consists of a disk type sheet material 11 and an adhesive layer 12 formed on one surface of the sheet material 11. The sheet material 11 is made of a synthetic resin such as polyethylene. The adhesive layer 12 consists of an acryl resin adhesive or the like. Further, a release sheet 13 having nonadhesive property prepared by applying a silicone is adhered to the protective sheet 10 to protect the adhesive surface of the adhesive layer 12. The protective sheet 10 having the structure above described is formed into a disk by punching or the like corresponding to the size of a CD-R. When the protective sheet 10 is to be used, the release sheet 13 is peeled and the sheet 10 is adhered to the substrate or protective film side of a CD-R.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc for protecting the surface of various optical discs such as compact discs (CDs), CD-ROMs and images, and an optical disc protective sheet.

[0002]

2. Description of the Related Art Conventionally, for example, a compact disc (C
Commercially available optical discs such as D) and CD-ROM,
It is read-only, and the information is recorded in the pressing process during manufacturing, and the user cannot record the information by himself. On the other hand, a recordable so-called write-once type CD (CD-R) is shipped in a state in which no signal is recorded, and the user himself / herself records desired information on the CD-R only once. You can do it. This allows the user to duplicate a relatively small number of CD-ROMs at a relatively low cost.

Such a CD-R is usually constructed as shown in FIG. That is, in FIG. 22, the CD
-R1 is to form a dye recording layer 3, a gold reflection layer 4, and a protective layer 5 made of an ultraviolet (UV) curing resin in order on a disk-shaped substrate 2 made of a transparent synthetic resin such as polycarbonate. The surface of the substrate 2 is spirally formed and has a predetermined pitch (for example, 1.6 μm).
m) is previously formed. Then, at the time of recording information, by irradiating the laser pulse L from the substrate 2 side, information is written in the guide groove 2a. That is, a pit, which is a unit of recording, is heated and melted by the irradiation of the laser pulse L, and the partially decomposed dye of the dye recording layer 3 and the heat-dissolved substrate material interact with each other, whereby
Deformed portions (that is, recording pits) in submicron units are formed. As a result, stable desired information is written. Therefore, in the case of CD-R, the conventional C
CDs do not require complicated data processing processes used in D production, large-scale cutting and stamping equipment.
Information recording can be easily performed by the R recorder unit. After recording the information, the CD-R is colored on the surface of the protective film 5 to indicate the content of the information recording,
The decoration of letters, design, etc. (so-called label printing) will be formed by silk printing or the like.

Here, the unrecorded CD-R is manufactured in, for example, a controlled and relatively large factory,
Information recording, printing, etc., and shipping for sales etc. are carried out by a relatively small-scale manufacturing company or the like according to the information to be recorded. Therefore, unrecorded CD-R
Will be transported to the individual manufacturing companies in a certain unit of quantity. At that time, in order to prevent damage to the surface of each CD-R, adhesion of dirt, and the like, the CD-R is transported by using a bulk pack (described later).

This bulk pack is constructed, for example, as shown in FIG. In FIG. 23, the bulk pack 6 includes a disk-shaped base 6a, a pillar 6b extending upward from the center of the base 6a, and a through hole 6c that is placed on the base 6a and that allows the upper end of the pillar 6b to pass therethrough. Case 6
d, and a fixed cap 6f screwed onto the male screw 6e formed near the upper end of the column 6b from above the case 6d. The base 6a is larger than the outer diameter of the CD-R1, the outer diameter of the column 6b is slightly larger than the inner diameter 1a of the CD-R1, and the through hole 6c of the case 6d is the column 6a.
The outer diameter of b and the inner diameter of CD-R1 1a are large and are selected.

Thus, when a plurality of CD-R1's are to be accommodated in the bulk pack 6, the inner diameters 1a of the respective CD-R1's are first inserted into the columns 6b, and then the stacked CD's are stacked.
-R1 is covered with the case 6d so that the through hole 6c is aligned with the upper end of the support column 6b. As a result, the lower edge of the case 6d is placed on the peripheral edge of the base 6a and the inside is closed. Here, the cap 6f is screwed onto the male screw 6e on the upper end of the support column 6b protruding from the upper surface of the case 6d. Then, the cap 6f has the male screw 6e.
By rotating the case 6d against the base 6
It will be pressed against a and fixedly held. Thus, in the case 6d, the respective CD-Rs 1 are retained in the state where they are fitted and inserted in the support columns 6b so as not to rub or hit each other during transportation or the like.

[0007]

However, in transporting the CD-R1 using the bulk pack 6 as described above, the CD-R1 is accommodated in the bulk pack 6 or the CD-R1 taken out from the bulk pack 6 is loaded. When silk-printing the surface of the R1 on the side of the protective film 5 or the like, the surface of the CD-R1 may be scratched or dirt may be attached.
There is a problem that the manufacturing yield of the CD-R is reduced.

Therefore, in order to avoid these problems, it is necessary to spend a lot of time for maintenance and inspection of the equipment in each process and to pay close attention to the work. Therefore, there is a problem in that the operating rate is lowered, and it is necessary to take measures such as newly providing an inspection process after the work is completed, resulting in an increase in cost.

Further, the bulk pack 6 itself is relatively expensive, and when the bulk pack 6 is used as a case through which the bulk pack 6 is passed, cleaning is required, and further, a space required for returning the empty bulk pack 6 is returned. However, there is a problem that the transportation cost becomes very high.

In view of the above points, the present invention provides an optical disc and a protective sheet for an optical disc, which can easily prevent the surface of the optical disc from being damaged or adhering dirt without using a special case or the like. It is intended to be provided.

[0011]

According to the present invention, the above object is to provide an optical disc having a substrate and a protective film on at least one of the surfaces exposed to the outside of the substrate and the protective film. This is achieved by an optical disc having a protective sheet.

Further, according to the present invention, the above object is attached to at least one of the surfaces exposed to the outside of the substrate and the protective film with respect to the optical disc having the substrate and the protective film. This is achieved by a protective sheet for an optical disc, which is characterized in that

According to the above structure, the surface of the optical disk is closely covered with the protective sheet when the optical disk is conveyed or handled for label printing, so that the surface of the optical disk is directly scratched or soiled. Will not adhere. Further, even if the optical discs are directly overlapped with each other, the surface of the optical discs is not directly scratched or soiled.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIGS.
The embodiment described below is a preferred specific example of the present invention, and thus various technically preferable limitations are added. However, the scope of the present invention particularly limits the present invention in the following description. The embodiment is not limited to these embodiments unless otherwise stated.

FIG. 1 shows an optical disc and a protective sheet for an optical disc according to a first embodiment of the present invention.
In FIG. 1, a protective sheet 10 for an optical disc includes a disc-shaped sheet material 11 and an adhesive layer 12 provided on one surface of the sheet material 11.

The sheet material 11 is a sheet material made of a synthetic resin such as polyethylene or polypropylene, or a synthetic sheet such as nylon, rayon or polyethylene terephthalate, which is entangled with each other and heat-bonded or a binder to form a fixed sheet. Or a material obtained by foaming a synthetic resin such as polystyrene into a sheet.

The adhesive layer 12 is made of acrylic resin,
An adhesive material made of vinyl acetate or the like, which is applied to one surface of the sheet material 11.

The protective sheet 10 may be adhered with a non-adhesive release sheet 13 obtained by applying silicon or the like in order to protect the adhesive surface of the adhesive layer 12.

The protective sheet 10 having such a structure is a CD
It is completed by forming into a disk shape corresponding to the shape of -R by punching or the like.

The optical disk protective sheet 10 according to the embodiment of the present invention is constructed as described above, and the protective sheet 10 is illustrated in a state where the release sheet 13 is peeled off during use. As shown in FIG. 2, the CD-R 14 is attached and attached to the substrate 14a side and the protective film 14b side.

As a result, the CD-R 14 has its substrate 1
Both 4a and the protective film 14b are protected by the protective sheet 10. Therefore, CD-R14
When transported for label printing, information writing, or the like, even if they are stacked on each other as they are, the surfaces of the substrate 14a and the protective film 14b are not scratched or dirty, and are reliably Will be protected by.

Incidentally, in FIG. 2, the protective sheet 10 is
Although it is adhered to both the substrate 14a side and the protective film 14b side of the CD-R 14, it may be adhered to only one of them. In this case, the surface to which the protective sheet 10 is attached can be protected by the protective sheet 10.

Further, in FIG. 2, when the protective sheet 10 is composed of a removable sheet, the CD-R14
When the recording sheet is recorded on the CD-R 14, the CD-R 14 is reproduced, or before the product is shipped as a product, the protection sheet 10 is
4 will be easily peeled off.

FIG. 3 shows an optical disk and a protective sheet for an optical disk according to the second embodiment of the present invention.
In FIG. 3, the protective sheet 20 is provided with a suction cup portion 21 composed of a large number of minute protrusions on the surface of a soft material such as synthetic rubber. Specifically, the protective sheet 20 is a compound obtained by adding a filler or dispersant such as silica to an organic silicon compound such as dimethylpolysiloxane or methylvinylpolysiloxane for silicone rubber or the like. When a vulcanizing agent such as an organic peroxide is added to form a sheet with a heating roll, the minute projections 21 are formed on the surface of the heating roll.
By forming an emboss corresponding to a (see FIG. 4), the suction cup portion 21 is formed.

According to the optical disc and the protective sheet for an optical disc according to the third embodiment of the present invention, the protective sheet 20 has a suction cup portion formed by the minute recesses 21b instead of the minute protrusions as shown in FIG. 21 is provided.

According to the protective sheet 20 having such a structure, the minute projections 21a or the minute concave portions 21b have a sucker effect, so that when the protective sheet 20 is attached to the surface of the CD-R, it is affected by a minute pressure. In the space defined between the protective sheet 20 and the CD-R, the internal air is pushed out and the internal atmospheric pressure is lowered, so that the protective sheet 20 can be adsorbed on the surface of the CD-R 14. become. On the other hand, the protective sheet 20 is the CD-R14.
When the protective sheet 20 is peeled from the surface of the CD-R 14, the protective sheet 20 can be easily peeled from the surface of the CD-R 14.

FIG. 6 shows an optical disk and an optical disk protective sheet according to a fourth embodiment of the present invention.
In FIG. 6, the protective sheet 30 includes a large number of parallelogrammic small concave portions 31. As a result, the protective sheet 3
When 0 is attached to the surface of the CD-R 14, it can be adsorbed on the surface of the CD-R 14 by the suction effect of the minute recesses 31.

FIG. 7 shows an optical disk and a protective sheet for an optical disk according to the fifth embodiment of the present invention.
In FIG. 7, the protective sheet 40 is provided with a minute recess 41 having a shape in which a large number of square pyramids are turned down. Thereby, when the protective sheet 40 is attached to the surface of the CD-R 14,
Similarly, due to the suction effect of the minute recesses 41, the CD-R
14 will be adsorbed on the surface.

In the above description, the protective sheet 10,
Although a case where silicone rubber is used as the sheet material 11 of 20, 30, 40 is shown, the sheet material 11 is not limited to this, and is, for example, soft and elastic (that is, stretches well with respect to tension and is separated from each other). Other materials, such as synthetic rubber, styrene-butadiene rubber, butyl rubber, urethane rubber, acrylic rubber and thermoplastic elastomers that have plasticity at high temperatures, as long as they have the property of rapidly returning to their original shape Can be used.

FIG. 8 shows an optical disk and a protective sheet for an optical disk according to the sixth embodiment of the present invention.
In FIG. 8, the protective sheet 50 has an adhesive layer 5 on its surface.
When 1 is applied, a non-adhesive region 51a where the adhesive layer 51 is not applied is formed along one side of the long protective sheet 50. Then, when punching out the individual protective sheets 50, as shown in the lower part of FIG.
The punching process is performed so that a part of 0 hangs on the non-adhesive region 51a. According to such a protective sheet 50, the protective sheet 50 adhered to the CD-R 14 is easily peeled off from the CD-R 14 from the non-adhesive region 51a, and unnecessary force is applied to the CD-R 14. Will disappear. Also, the charging action that occurs when the protective sheet 50 is peeled off is reduced, and the CD-R after the protective sheet 50 is peeled off.
The adhesion of dust to the surface of 14 is also reduced.

FIG. 9 shows an optical disk and an optical disk protective sheet according to a seventh embodiment of the present invention.
In FIG. 9, the protective sheet 60 has an adhesive layer 6 on its surface.
After applying 1, the one side of the long protective sheet 60 is folded back inside and adhered to form a non-adhesive region 61a where the adhesive layer 61 is not exposed. Then, when the individual protective sheets 60 are punched, as shown in the lower part of FIG. 9, the individual protective sheets 60 are partially punched in the non-adhesive regions 61a and punched.
According to such a protective sheet 60, the protective sheet 60 attached to the CD-R 14 can be easily peeled from the CD-R 14 from the non-adhesive region 61a.

FIG. 10 shows an optical disk and an optical disk protective sheet according to an eighth embodiment of the present invention. In FIG. 10, the protective sheet 70 has a long length formed by using a roll partially smoothed when forming the suction cups 71 made of fine protrusions or fine protrusions on a sheet made of an elastic material. A non-adsorption region 71a having no suction cup portion 71 is formed along one side of the lengthy protective sheet 70. Then, when punching out the individual protective sheets 70, as shown in the lower part of FIG.
The punching process is performed so that a part of each of the parts is covered with the non-suction area 71a. According to such a protective sheet 70, the protective sheet 70 attached to the CD-R 14 can be easily peeled from the CD-R 14 from the non-adsorption region 71a.

FIG. 11 shows an optical disk and a protective sheet for an optical disk according to the ninth embodiment of the present invention. In FIG. 11, the protective sheet 80 is the same as that shown in FIGS.
Unlike the arcuate non-adhesive regions or non-adsorption regions of the protective sheets 50, 60, 70 shown in FIG. 0, a plurality of adhesive parts or adsorption parts 81 are dispersed and arranged over the entire protection sheet 80. . As a result, the adhesive force or adsorption force of the protective sheet 80 with respect to the surface of the CD-R 14 can be significantly reduced. Therefore, when the protective sheet 80 is peeled from the CD-R 14, the force required for peeling is small, and therefore the CD-R 14 is not deformed.

FIG. 12 shows an optical disk and an optical disk protective sheet according to the tenth embodiment of the present invention. 12, the protective sheet 90 is similar to the protective sheet 80 shown in FIG.
Are arranged in an annular shape along the periphery of the protective sheet 90. As a result, the adhesive force or the suction force of the protective sheet 90 with respect to the surface of the CD-R 14 can be significantly reduced. Therefore, when the protective sheet 90 is peeled from the CD-R 14, the force required for peeling can be small, so that the CD
-R14 is not deformed.

Protective sheet 80 according to FIG. 11 or FIG.
In the case of a protective sheet having an adhesive portion, or 90 is formed, when the adhesive material is applied to the sheet material, the adhesive material application area and the adhesive material application area are formed on the surface of the adhesive material application roll. This can be easily done by doing. Further, in the case of the protective sheet having the adsorption portion, the protective sheet can be easily formed by forming the roll surface corresponding to the non-adsorption region to be smooth.

FIG. 13 shows the above-mentioned protective sheets 10 and 2.
The modification of 0, 30, 40, 50, 60, 70, 80, 90 is shown. In FIG. 13, the protective sheet 10 is
An antistatic layer 15 is provided on the surface opposite to the adhesive layer 12.

The antistatic layer 15 is prepared by diluting an antistatic material composed of anionic, cationic or nonionic surface active agents or polar polymeric materials with a solvent such as isopropyl alcohol, and then rolling. It is applied using a coater or the like. Thereby, the protective sheet 10
Will be easily imparted with antistatic properties.

The antistatic layer 15 is applied by using a roll coater or the like, which is obtained by adding conductive fine powder such as tin oxide or antimony to polyester resin in an amount of 3% by weight. As a result, the half-life of the charge amount is about 20 in the discharge state after applying a voltage of 8.5 kV to the protective sheet 10 by corona discharge for 60 seconds.
Second, the half-life before application of the antistatic layer 15 is several tens of minutes or more, which can be remarkably improved.

Further, the antistatic layer 15 may be formed as a sheet material by kneading carbon or the like with a base material and then forming it into a sheet shape.

Thus, the provision of the antistatic layer 15 reduces the charging action of the protective sheet 10 and the like that occurs when the protective sheet 10 is peeled from the CD-R 14, and the dust due to the charging after the protective sheet 10 and the like are peeled off. Redeposition, etc., can be greatly reduced.

FIG. 14 shows an optical disk and an optical disk protective sheet according to an eleventh embodiment of the present invention. In FIG. 14, the protective sheet 100 is the sheet material 1.
01 and the adhesive layer or the adsorption layer 10 formed on the surface thereof
2 and a thick portion 103 is formed along one side of the sheet material 101. The thick portion 103 is formed on a part of the surface of the sheet material 101,
The sheet material 101 can be formed by stacking members made of the same material as the sheet material 101 by adhesion, adhesion, or the like, but is not limited to this. For example, as shown in FIG.
It can also be configured by folding back a part of the sheet material 101 on which 02 is formed and adhering the adhesive layer or the adsorption layer 102 to each other. Further, the thick portion 103 may be extruded integrally with the sheet material 101 as a modified sheet material 104 as shown in FIG. 15, for example. In this case, the deformed sheet material 104 can be easily molded by using the extrusion die 105 for extrusion molding which is formed to have a corresponding shape.

As described above, the thick portion 10 is formed on the protective sheet 100.
Since 3 is provided, the protective sheet 1 from this part
The peeling of No. 00 is easily performed without applying unnecessary force to the CD-R 14, and the charging action generated at the time of peeling is reduced. Therefore, C after the protective sheet 100 is peeled off
Adhesion of dust to the surface of D-R14 is reduced.

FIG. 16 shows an optical disk and an optical disk protection sheet according to the twelfth embodiment of the present invention. 16, the protective sheet 110 is similar to the protective sheet 10 shown in FIG. 1, and the sheet material 111 and the adhesive layer or the adsorption layer 1 formed on the surface of the sheet material 111.
12 and is formed in a wavy shape (or embossed) over the entire sheet material. As a result, the protective sheet 110 becomes the CD-R14.
When attached to the surface of the CD-R 14, only the adhesive layer of the protective sheet 110 or a part of the adsorption portion 112 is attached to the surface of the CD-R 14. Therefore, the adhesive force or the suction force with respect to the CD-R 14 can be significantly reduced, so that when the protective sheet 110 is peeled from the CD-R 14, the force required for the peeling can be small, so that the CD-R 14 is deformed. In addition, the protective sheet 1 can be used for selling or distributing the CD-R 14 while reducing the electrifying action generated at the time of peeling.
The work efficiency when peeling 10 is improved.

FIG. 17 shows an optical disk and an optical disk protective sheet according to a thirteenth embodiment of the present invention. 17, the protective sheet 120 is similar to the protective sheet 10 shown in FIG. 1, and the sheet material 121 and the adhesive layer or the adsorption layer 1 formed on the surface of the sheet material 121.
22 and is provided on the surface of the sheet material 121 on the side opposite to the adhesive layer or the adsorption layer 122, at least a part thereof, by coloring by printing or the like 123
Is provided. This decoration 123 is provided by forming an adhesive layer or an adsorption layer 122 on a sheet material 121 made of, for example, polyethylene or polypropylene, and then printing it on the opposite surface by gravure printing or the like. Can be done.

According to the protective sheet 120 having such a decoration 123, the operator can easily visually recognize that the protective sheet 120 is attached to the CD-R 14 and the CD-R 14 It is also possible to write a cautionary note on the use of the
When the CD-R 14 to which 20 is attached is attached to the recording or reproducing device, the recording or reproducing device cannot recognize the CD-R 14 due to the presence of the protective sheet 120. It is possible to obtain an effect such as not accepting the CD-R 14 to which 120 is attached. Note that the decoration 123 is not limited to coloring, characters, etc. as shown in FIG. 17, but a design 124 by separately coloring the colors as shown in FIG. 18 can also be used.

FIG. 19 shows an optical disk and an optical disk protective sheet according to the fourteenth embodiment of the present invention. 19, the protective sheet 130 is similar to the protective sheet 10 shown in FIG. 1, and the sheet material 131 and the adhesive layer or the adsorption layer 1 formed on the surface of the sheet material 131.
32 and, in this case, the CD-R
Two protective sheets to be attached to both surfaces of 14 are connected via a connecting portion 133. As shown in FIG. 20, the protective sheet 130 may be formed from a sheet material 134 having a width larger than twice the diameter of the CD-R 14 to which the protective sheet 130 is to be attached, via a connecting part 133. It is formed by punching in a connected state. As a result, the protective sheet 130 is provided on both sides of the CD-R 14, that is, on both the substrate side and the protective film side.
Work efficiency will be improved when attaching the.

FIG. 21 shows an optical disk and an optical disk protection sheet according to the fifteenth embodiment of the present invention. 21, the protective sheet 140 is similar to the protective sheet 10 shown in FIG. 1, and the sheet material 131 and the adhesive layer or the adsorption layer 1 formed on the surface of the sheet material 131.
32, and is formed into a bag shape as a whole. As a result, the CD-
By inserting R14, both sides of CD-R14,
That is, since the protective sheet 130 is attached to both the substrate side and the protective film side, the attaching work is facilitated, and the CD-R 14 has a high hermeticity, so that the dustproof effect is remarkably high. Will be improved.

In the above embodiment, except for the protective sheet 140 shown in FIG. 21, all the protective sheets 10 to 130 are formed to have substantially the same diameter as the CD-R 14 to be attached. , CD-R14 may be formed to have a larger diameter. In this case, when the protective sheet is peeled off and stored in a carrying case or the like after the printing and other steps are completed, the CD-R14 is directly touched. C without touching
Since the work can be performed with the portion of the protective sheet protruding from the edge of the D-R 14, workability is improved.

Further, in the above embodiment, the CD-R is described as the optical disc to which the protective sheet is attached, but the present invention is not limited to this, and similarly, a disc-shaped substrate and a disc-shaped substrate are sequentially formed thereon. Another optical disc, such as a CD or a CD-ROM, including a recording layer and a protective film formed on
Alternatively, it is obvious that the present invention can be applied to an optical disc for image recording.

As described above, according to the embodiment of the present invention, the surface of the CD-R 14 is brought into close contact with the removable sheet 10 or the like when the CD-R 14 is conveyed or handled for label printing. CD-R1 as it is covered
No scratches or stains are directly attached to the surface of No. 4, the yield in the production of CD-R14 is improved, and stable and high-quality CD-R14 is obtained. Moreover, even if the CD-Rs 14 are directly overlapped with each other, the surface of the CD-R 14 will not be directly scratched or dirty, so that the CD-R 14 is not housed in a special case or the like. It will be possible to transport and the transportation cost can be reduced.

[0051]

As described above, according to the present invention, it is possible to easily prevent the surface of the optical disc from being damaged or attached with dirt without using a special case or the like. A protective sheet will be provided.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing a configuration of a first embodiment of a protective sheet for an optical disc according to the present invention.

FIG. 2 is an exploded perspective view of the protective sheet of FIG. 1 attached to both sides of a CD-R.

FIG. 3 is a schematic perspective view showing a configuration of a second embodiment showing a state before punching of the optical disk protective sheet according to the present invention.

4 is an enlarged perspective view of a main part of the protective sheet of FIG. 3 and a cross-sectional view taken along line A. FIG.

FIG. 5 is an enlarged perspective view of a main part of a third embodiment of a protective sheet for an optical disk according to the present invention and a sectional view taken along line B.

6A and 6B are a schematic plan view and a cross-sectional view taken along line C showing a fourth embodiment of the protective sheet for an optical disc according to the present invention before punching.

7A and 7B are a schematic plan view and a sectional view taken along line D showing a fifth embodiment of the optical disk protective sheet according to the present invention before being punched.

8A and 8B are a schematic perspective view and a plan view showing a state before punching processing in a sixth embodiment of the optical disk protective sheet according to the present invention.

FIG. 9 is a schematic perspective view and a partially enlarged plan view showing a state before punching processing in a seventh embodiment of the optical disk protective sheet according to the present invention.

FIG. 10 is a schematic perspective view and a plan view showing a state before punching processing in an eighth embodiment of the optical disk protective sheet according to the present invention.

FIG. 11 is a plan view showing a ninth embodiment of the optical disk protection sheet according to the present invention.

FIG. 12 is a plan view showing a tenth embodiment of a protective sheet for an optical disc according to the present invention.

FIG. 13 is a cross-sectional view of essential parts showing a modified example of the protective sheet for an optical disc according to the present invention, which is provided with an antistatic layer.

FIG. 14 is a plan view and a side view showing an eleventh embodiment of a protective sheet for an optical disc according to the present invention.

15 is a schematic perspective view showing extrusion molding of the sheet material of the optical disk protective sheet of FIG.

FIG. 16 is a schematic perspective view showing a state before punching processing in the twelfth embodiment of the optical disk protective sheet according to the present invention.

FIG. 17 is a schematic perspective view showing a thirteenth embodiment of a protective sheet for an optical disc according to the present invention.

FIG. 18 is a schematic perspective view showing a modification of the optical disc protection sheet of FIG.

FIG. 19 is a schematic perspective view showing a fourteenth embodiment of a protective sheet for an optical disc according to the present invention.

20 is a schematic plan view showing a state before punching processing of the optical disc protective sheet of FIG.

FIG. 21 is a schematic perspective view showing a fifteenth embodiment of a protective sheet for an optical disc according to the present invention.

FIG. 22 is a cross-sectional view of essential parts showing a configuration example of a CD-R as a conventional optical disc.

FIG. 23 is an exploded perspective view showing the structure of a conventional bulk pack for carrying a CD-R.

[Explanation of symbols]

10, 20, 30, 40, 50, 60, 70, 80, 9
0, 100, 110, 120, 130, 140 ... Protective sheet, 11, 101, 111, 121, 131 ...
Disc-shaped sheet material, 12 ... Adhesive layer, 13 ... Release sheet, 14 ... CD-R, 15 ... Antistatic layer,
21, 71 ... Sucker part, 21a ... Micro projections, 21
b, 31, 41 ... Minute recesses, 51, 61 ... Adhesive layer, 51a, 61a ... Non-adhesive area, 71a ... Non-adhesive area, 81, 91 ... Adhesive portion or adsorbent portion, 10
2, 112, 122, 132 ... Adhesive layer or adsorption layer, 103 ... Thick portion, 104 ... Variant sheet material,
105 ... Extrusion die, 123,124 ... Decoration, 1
33 ... Connection part

Claims (11)

[Claims] 1. An optical disk having a substrate and a protective film, wherein a protective sheet is provided on at least one of the surfaces exposed to the outside of the substrate and the protective film. 2. The optical disk according to claim 1, wherein the protective sheet is adhesive or adsorptive and is attached to the surface of the substrate and / or the protective film. 3. An optical disk having a substrate and a protective film, of the surfaces exposed to the outside of the substrate and the protective film,
A protective sheet for an optical disc, which is configured to be attached to at least one of the surfaces. 4. The protective sheet according to claim 3, wherein the protective sheet is adhesive or adsorptive and is attached to the surface of the substrate and / or the protective film. 5. The protective sheet is an absorptive removable sheet in which a large number of fine protrusions or fine recesses having a suction cup-like effect are formed on the surface of a soft material such as synthetic rubber. The protective sheet according to claim 4. 6. The protective sheet has a non-adhesive part or a non-adsorptive part in at least a part thereof,
The protective sheet according to claim 4, which is configured. 7. The protective sheet according to claim 4, wherein the protective sheet is provided with an antistatic property by being subjected to an antistatic treatment or formed of an antistatic material. 8. The protective sheet according to claim 3, wherein at least a part of the protective sheet is formed to be relatively thick. 9. The protective sheet according to claim 3, wherein at least a part of the protective sheet is decorated by coloring by printing or the like, characters, designs and the like. 10. The protective sheet according to claim 3, wherein protective sheets attached to the surfaces of the substrate and the protective film of the optical disc are connected to each other. 11. The protective sheet according to claim 3, wherein the protective sheet is formed to have a larger diameter than the outer diameter of the optical disc to be attached.