JP2013177179A - Method for storing recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for storing a recording medium capable of inexpensively storing a recording medium for a long period of time.SOLUTION: A method 100 for storing a recording medium has a process (S101) of housing the recording medium in a cartridge having an irreversible structure left with a fracture mark caused by unsealing; a process (S102) of sealing the cartridge by using the irreversible structure; a process (S103) of housing the cartridge in a bag member formed of a laminated film comprising a metal layer and a synthetic resin layer, and having an opening at one end; a process (S104) of vacuuming the interior of the bag member; and a process (S105) of enclosing an inert gas in the bag member, and sealing the opening.

Description

  The present invention relates to a recording medium storage method for storing data recorded on an optical recording medium such as an optical disk for a long period of time.

  An optical recording medium is one of recording media capable of writing a large amount of information such as high-density image data. As such an optical recording medium, for example, a rewritable optical recording medium such as a magneto-optical disk and a phase change optical disk, and a write-once optical recording medium such as a CD-R, DVD-R, and BD-R have already been put into practical use. Has been.

  However, in the optical recording medium as described above, since the recording layer contains a photopolymer, when the recording layer is stored for a long period of time, the concentration of oxygen or moisture in the recording layer gradually increases, and the recording layer changes in quality and sensitivity. Or the sensitivity of the recording layer is lowered due to the polymerization inhibiting effect of oxygen or moisture.

Therefore, it has been proposed to store an optical recording medium such as an optical disk in a packaging material having a gas barrier property in order to preserve it for a long period of time. For example, in Patent Document 1 (Japanese Patent Application Laid-Open No. 2008-37443), in order to enable the recording medium to be stored for a long period of time, the recording medium has a moisture permeability of 0.01 to 1.0 g / (m ² · day). Sealing with the following packaging materials is disclosed.
JP 2008-37443 A

  However, in the conventional example according to the cited document 1, an optical recording medium that records information by holography is used. However, such an optical recording medium is not yet widespread and is expensive. There is a problem that the cost for storing data is high.

  In order to solve the above-mentioned problem, the invention according to claim 1 includes a step of accommodating a recording medium in a cartridge having an irreversible structure in which a destruction trace remains by opening, a step of sealing the cartridge with the irreversible structure, A step of housing the cartridge in a bag member formed of a laminate film composed of a metal layer and a synthetic resin layer and having an opening at one end, a step of evacuating the bag member, A method of storing a recording medium, comprising: enclosing an active gas and sealing the opening.

  According to a second aspect of the present invention, in the method for storing a recording medium according to the first aspect, in the step of storing the cartridge in the bag member, an oxygen scavenger and an oxygen detection agent are attached to the bag member together with the cartridge. It is characterized by accommodating.

According to a third aspect of the present invention, in the recording medium storage method according to the second aspect, the first space in which the cartridge and the oxygen scavenger are accommodated, and the oxygen detecting agent only in the first space. It is characterized by making the two spaces independent.

  According to a fourth aspect of the present invention, in the storage method for a recording medium according to the third aspect, the bag member constituting the second space has a transmission window in which the metal layer is not provided. And

  According to a fifth aspect of the present invention, in the recording medium storage method according to any one of the first to fourth aspects, the recording medium is an optical disk.

  According to a sixth aspect of the present invention, in the method for storing a recording medium according to any one of the first to fifth aspects, the step of storing the bag member in which the cartridge is stored in a moisture-proof chamber is further provided. It is characterized by having.

  In the recording medium storage method according to the present invention, currently widely used optical recording media can be used. According to the recording medium storage method according to the present invention, the recording medium can be used over a long period of time, It can be stored at low cost.

It is a figure which shows the flow of the storage method of the recording medium which concerns on embodiment of this invention. It is a figure which shows the optical disk 10 which is an example of the optical recording medium preserve | saved with the storage method of the recording medium which concerns on embodiment of this invention. 2 is a diagram showing a state where an optical disk 10 is accommodated in a cartridge 20. FIG. It is a figure which shows the accommodation process to the bag member 40 of the cartridge 20, the oxygen absorber 60, and the oxygen detection agent 70. FIG. It is a figure which shows the bag member 40 which passed through the process of enclosing nitrogen, after evacuating. It is a figure which shows the bag member 40 which passed the airtight sealing process. It is a figure which shows a mode that the bag member 40 in which the optical disk 10 is accommodated is stored in the moisture-proof warehouse 90. FIG.

  Hereinafter, the embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a flow of a recording medium storage method according to an embodiment of the present invention. FIG. 2 is a diagram showing an optical disc 10 which is an example of an optical recording medium stored by the recording medium storage method according to the embodiment of the present invention. As the optical disk 10 used in the present invention, it is preferable to use an optical disk having a dielectric layer (none of which is shown) in the upper and lower layers of the recording layer for recording data. As such an optical disc 10, a currently widely available optical disc can be used.

  Step S <b> 101 is a process of storing the optical disk 10 in the cartridge 20. As the cartridge 20 used in the present invention, a cartridge having an irreversible structure 30 in which a destruction trace remains after opening is used. As a specific structure of such an irreversible structure 30, a conventionally known structure can be appropriately employed. In the present invention, since the cartridge 20 having such an irreversible structure 30 is used, data cannot be read or altered without leaving a trace. In step S <b> 102, the optical disk 10 is sealed in the cartridge 20 by such an irreversible structure 30 of the cartridge 20.

  Step S <b> 103 is a process of storing the cartridge 20, the oxygen scavenger 60, and the oxygen detector 70 in the bag member 40. The bag member 40 used in the present invention is composed of a laminate film composed of a metal layer and a synthetic resin layer (both layers are not shown), and has an opening 41 at one end. The cartridge 20, the oxygen scavenger 60, and the oxygen detector 70 are accommodated in the bag member 40.

  As the metal layer of the laminate film constituting the bag member 40, it is preferable to use aluminum. The synthetic resin layer constituting the laminate film has oxygen and moisture permeability. However, such a metal layer can shield the transmission of oxygen and moisture.

  Further, the synthetic resin layer of the laminate film constituting the bag member 40 is not particularly limited and can be appropriately selected from known ones, for example, polyethylene, polypropylene, polyethylene terephthalate, aliphatic polyamide, aromatic Examples include polyamide, polyphenylene sulfide, polystyrene, polycarbonate, polyvinyl chloride, polyacrylonitrile, ethylene / vinyl alcohol copolymer, polyvinylidene chloride, polyimide, ionomer, and composite materials thereof.

  One feature of the bag member 40 used in the present invention is that it has a transmission window 42 not provided with the metal layer as described above. By providing such a transmission window 42, the color change of the oxygen detection agent 70 accommodated in the bag member 40 can be confirmed from the outside of the bag member 40. In the present embodiment, the transmissive windows 42 are provided on both sides of the bag member 40, but may be provided on only one side. Further, the width of the transmission window 42 may be any size as long as the color change of the oxygen detection agent 70 can be confirmed. For example, the width may be such that only a part of the oxygen detector 70 can be seen.

  The oxygen detecting agent 70 accommodated in the bag member 40 together with the cartridge 20 is colored or discolored when the oxygen concentration in the atmosphere reaches a certain amount. The color development or discoloration can be confirmed. The number of oxygen detectors 70 accommodated in the bag member 40 is arbitrarily selected.

  For the oxygen scavenger 60 accommodated in the bag member 40 together with the cartridge 20, for example, a substance having a high oxidation tendency such as fine powder of reduced iron can be used.

  In addition, it is desirable to perform an operation of confirming the storage state of data recorded on the optical disc 10 at a frequency of about once every several years. When the optical disk 10 is stored in such an operation, the bag member 40 may be formed of only a synthetic resin layer without a metal layer.

  In step S104, the inside of the bag member 40 is evacuated, and in the subsequent step S105, an inert gas such as nitrogen is sealed in the bag member 40.

  In step S106, the bag member 40 sealed with nitrogen is sealed by heat welding or the like.

In such a hermetic sealing process of the bag member 40, first, the first space R1 in which the cartridge 20 and the oxygen scavenger 60 are accommodated is formed by forming the first seal portion S1. The transmission window 42 is not provided in the first space R1.

  Next, in the opening 41 of the bag member 40, the second seal portion S2 is formed, and the bag member 40 is sealed to form the second space R2 in which the oxygen detection agent 70 is accommodated. A transmission window 42 is provided in the second space R2. FIG. 6 is a view showing the bag member 40 that has undergone the hermetic sealing process.

Thus, in the present invention, the first cartridge 20 and the oxygen scavenger 60 are accommodated.
The space R1 and the second space R2 in which only the oxygen detection agent 70 is accommodated are separated from each other by the first seal portion S1, and are in an independent state.

In the second space R <b> 2, a transmission window 42 in which a metal layer is not provided on the laminate film constituting the bag member 40 is provided, and oxygen and moisture are likely to enter. Therefore, in terms of storing the optical disc 10, the condition is worse in the second space R2 than in the first space R1. In the present invention, the oxygen detecting agent 70 is accommodated in the second space R <b> 2 having a worse storage condition, and this discoloration can be confirmed from the transmission window 42. For this reason, prior to the invasion of oxygen into the first space R1 in which the cartridge 20 is accommodated, it is possible to know the possibility of oxygen intrusion into the first space R1 of the bag member 40.

  By the method as described above, the bag member 40 in which the cartridge 20, the oxygen scavenger 60, and the oxygen detector 70 are accommodated is accommodated in the moisture barrier 90 in step S107 as shown in FIG.

DESCRIPTION OF SYMBOLS 10 ... Optical disk 20 ... Cartridge 30 ... Irreversible structure 40 ... Bag member 41 ... Opening part 42 ... Transmission window 60 ... Deoxidation agent 70 ... Oxygen detection agent 90- ..Moisture barrier R1 ... 1st space R2 ... 2nd space S1 ... 1st seal part S2 ... 2nd seal part

Claims (6)

A step of accommodating a recording medium in a cartridge having an irreversible structure in which a breakage trace remains by opening;
Sealing the cartridge with the irreversible structure;
A step of accommodating the cartridge in a bag member formed of a laminate film comprising a metal layer and a synthetic resin layer and having an opening at one end;
Evacuating the bag member; and
Enclosing an inert gas in the bag member and sealing the opening;
A method for storing a recording medium, comprising: 2. The recording medium storage method according to claim 1, wherein, in the step of storing the cartridge in the bag member, an oxygen scavenger and an oxygen detection agent are stored in the bag member together with the cartridge. 3. The recording medium storage method according to claim 2, wherein the first space in which the cartridge and the oxygen scavenger are accommodated and the second space in which only the oxygen detector is accommodated are made independent. . The method for storing a recording medium according to claim 3, wherein the bag member constituting the second space has a transmission window in which the metal layer is not provided. The recording medium storage method according to any one of claims 1 to 4, wherein the recording medium is an optical disk. 6. The recording medium storage method according to claim 1, further comprising a step of storing the bag member storing the cartridge in a moisture-proof storage.

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