JP2012027963A - Cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cartridge that can grasp the life of a hologram recording medium and can prevent the deterioration of the hologram recording medium.SOLUTION: A cartridge includes a housing, a hologram recording medium installed in the housing, and a polymer layer which is provided on the surface of the housing and which includes the material of the hologram recording medium.

Description

Embodiments described herein relate generally to a cartridge.

There is an optical information recording / reproducing apparatus as a recording apparatus capable of recording large-capacity data such as high-density images. It is desired to increase the amount of information recorded on an optical recording medium. In order to realize such high-capacity optical information recording, a hologram recording / reproducing apparatus has been proposed.

Among materials used for hologram recording media, there are materials called photopolymers. As the photopolymer, for example, a radical polymerizable monomer containing a radical polymerizable monomer, a thermoplastic binder resin, a photo radical polymerization initiator, or a sensitizing dye as a main component is known. In the hologram recording medium, for example, a polymerizable monomer is dispersed in a three-dimensional cross-linking material.

As an application example of the hologram recording medium, it is conceivable to store important data of a hospital or a company for a long period (for example, 50 years or more).

JP 2007-102898 A

However, it is difficult to grasp the lifetime of the hologram recording medium. Accordingly, it is difficult to prevent deterioration of the hologram recording medium.

Therefore, an object of the present invention is to provide a cartridge that can grasp the life of a hologram recording medium and prevent deterioration of the hologram recording medium.

A cartridge according to an aspect of the present invention includes a housing, a hologram recording medium provided in the housing, a polymer layer provided on a surface of the housing and including a material of the hologram recording medium, It is characterized by having.

1 is a diagram showing a cartridge according to a first embodiment of the present invention. The figure which shows the label which concerns on 1st Embodiment. The figure which shows the relationship between the temperature of a hologram recording medium, and a recording lifetime. The figure which shows a 1st modification. The figure which shows the 2nd modification. The figure which shows the 3rd modification. The figure which shows the 3rd modification. The figure which shows the relationship between the elapsed time of a polymer layer, and the transmittance | permeability.

Embodiments of the present invention will be described below with reference to the drawings. The same reference numerals denote the same items. Note that the drawings are schematic or conceptual, and the relationship between the thickness and width of each part, the ratio coefficient of the size between the parts, and the like are not necessarily the same as actual ones. Further, even when the same part is represented, the dimensions and ratio coefficient may be represented differently depending on the drawing.
(First embodiment)

FIG. 1 is a diagram showing a hologram recording / reproducing cartridge 10 (hereinafter referred to as a cartridge) according to the first embodiment.

The cartridge 10 includes a housing 15, a hologram recording medium 5 provided inside the housing 15, and a label 20 provided on the surface of the housing 15. The label 20 may be embedded in the housing 20 as long as the surface of the label 20 is exposed from the housing 15. The label 20 does not penetrate the housing.

The housing 15 may have a rectangular parallelepiped shape as shown in FIG. 1 or a cylindrical shape. The housing 15 is preferably excellent in light shielding properties. For example, a plastic material can be used as the material of the housing 15. The plastic material indicates, for example, polypropylene resin or polyethylene resin.

The hologram recording medium 5 may have a disk shape as shown in FIG. 1 or a coupon shape. The hologram recording medium 5 includes a matrix in which a polymerizable monomer and a polymerization initiator are incorporated into a three-dimensional crosslinked structure. The hologram recording medium 5 is formed by mixing a three-dimensional cross-linking material, a polymerizable monomer, and a polymerization initiator. The three-dimensional cross-linking material takes a polymerizable monomer and a polymerization initiator into a three-dimensional cross-linked structure and becomes a matrix. The film thickness of the hologram recording medium 5 is preferably from 0.1 mm to 2.0 mm.

The three-dimensional cross-linking material is used for constructing the structure of the hologram recording medium 5. The three-dimensional crosslinking material is three-dimensionally crosslinked and cured by a polymerization reaction. Examples of the polymerization reaction include cationic polymerization of an epoxy compound, cationic polymerization of vinyl ether, epoxy-amine polymerization, epoxy-acid anhydride polymerization, epoxy-mercaptan polymerization, and the like.

For example, an epoxy compound can be used as the three-dimensional crosslinking material. As epoxy compounds, 1,4-butanediol diglycidyl ether, 1,6-hexanediol diglycidyl ether, 1,8-octanediol diglycidyl ether, diethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, polypropylene glycol diglycidyl Ether, neopentyl glycol diglycidyl ether, diepoxy octane, resorcinol diglycidyl ether, diglycidyl ether of bisphenol A, diglycidyl ether of bisphenol F, 3,4-epoxycyclohexenylmethyl-3 ′, 4′-epoxycyclohexene carboxy Rate, and epoxypropoxypropyl-terminated polydimethylsiloxane. These may be used alone or in combination of two or more.

A curing agent may be added to the three-dimensional crosslinking material. As the curing agent, amines, phenols, organic acid anhydrides, and amides can be used. Specifically, ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, hexamethylenediamine, mensendiamine, isophoronediamine, bis (4-amino-3-methyldicyclohexyl) methane, bis (amino Methyl) cyclohexane, N-aminoethylpiperazine, m-xylylenediamine, 1,3-diaminopropane, 1,4-diaminobutane, trimethylhexamethylenediamine, iminobispropylamine, bis (hexamethylene) triamine, 1,3 , 6-Trisaminomethylhexane, dimethylaminopropylamine, aminoethylethanolamine, tri (methylamino) hexane, m-phenylenediamine, p-phenylenediamine, diaminodi Phenylmethane, diaminodiphenylsulfone, 3,3′-diethyl-4,4′-diaminodiphenylmethane, maleic anhydride, succinic anhydride, tetrahydrophthalic anhydride, methyltetrahydrophthalic anhydride, methylnadic anhydride, hexahydrophthalic anhydride, Methyl hexahydrophthalic acid, methylcyclohexene tetracarboxylic anhydride, phthalic anhydride, trimellitic anhydride, benzophenone tetracarboxylic anhydride, dodecenyl succinic anhydride, ethylene glycol bis (anhydrotrimellitate), phenol novolac resin, Examples include cresol novolac resin, polyvinyl phenol, terpene phenol resin, and polyamide resin.

Further, a curing catalyst may be added in addition to the curing agent. As the curing catalyst, for example, basic tertiary amines, organic phosphine compounds, imidazole compounds, and derivatives thereof can be used. Specifically, triethanolamine, piperidine, N, N′-dimethylpiperazine, 1,4-diazadicyclo (2,2,2) octane (triethylenediamine), pyridine, picoline, dimethylcyclohexylamine, dimethylhexylamine, benzyl Dimethylamine, 2- (dimethylaminomethyl) phenol, 2,4,6-tris (dimethylaminomethyl) phenol, 1,8-diazabicyclo [5,4,0] undec-7-ene (DBU) or a phenol salt thereof , Trimethylphosphine, triethylphosphine, tributylphosphine, triphenylphosphine, tri (p-methylphenyl) phosphine, 2-methylimidazole, 2,4-dimethylimidazole, 2-ethyl-4-methylimidazole, 2-phenylimidazole , 2-phenyl-4-methylimidazole, and 2-hepta imidazole. Latent catalysts such as boron trifluoride amine complex, dicyandiamide, organic acid hydrazide, diaminomaleonitrile and its derivatives, melamine and its derivatives, amine imide and the like may be used. Curing can be accelerated by adding a compound having active hydrogen, such as phenols or salicylic acid. Further, homocation polymerization of an epoxy compound by using an acid generating catalyst and an epoxy may be used.

The polymerizable monomers become polymers by reacting with each other. When the hologram recording medium 5 is irradiated so that, for example, two lasers intersect, interference occurs at this intersection, and interference fringes are formed. The polymerizable monomers react with each other through the polymerization initiator so as to match the interference fringes. As a result, a polymer dense / dense pattern is formed. The refractive index of the polymer depends on the polymerizable monomer. That is, if the refractive index of the polymerizable monomer and the refractive index of the matrix are different, this becomes a refractive index pattern and is reflected in the refractive index modulated interference fringes. Information is recorded on the hologram recording medium 5. The polymerizable monomer is a compound having at least one radically polymerizable ethylenically unsaturated bond, and examples thereof include an unsaturated carboxylic acid, an unsaturated carboxylic acid ester, an unsaturated carboxylic acid amide, and a vinyl compound. Specifically, acrylic acid, methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, isobutyl acrylate, 2-ethylhexyl acrylate, octyl acrylate, lauryl acrylate, stearyl acrylate, cyclohexyl acrylate, bicyclopentenyl acrylate , Phenyl acrylate, 2,4,6-tribromophenyl acrylate, isobornyl acrylate, adamantyl acrylate, methacrylic acid, methyl methacrylate, propyl methacrylate, butyl methacrylate, phenyl methacrylate, phenoxyethyl acrylate, chlorophenyl acrylate , Adamantyl methacrylate, isobornyl methacrylate, N-methylacrylamide, N, N-dimethylacrylamide, N, N- Tylene bisacrylamide, acryloyl morpholine, vinyl pyridine, styrene, bromostyrene, chlorostyrene, tribromophenyl acrylate, trichlorophenyl acrylate, tribromophenyl methacrylate, trichlorophenyl methacrylate, vinyl benzoate, 3,5-dichlorovinyl benzoate, vinyl naphthalene, Vinyl naphthoate, naphthyl methacrylate, naphthyl acrylate, N-phenyl methacrylamide, N-phenyl acrylamide, N-vinyl pyrrolidinone, N-vinyl carbazole, 1-vinyl imidazole, bicyclopentenyl acrylate, 1,6-hexanediol diacrylate, penta Erythritol triacrylate, pentaerythritol tetraacrylate, dipipe Data hexaacrylate, diethylene glycol diacrylate, polyethylene glycol diacrylate, polyethylene glycol dimethacrylate, tripropylene glycol diacrylate, propylene glycol trimethacrylate, diallyl phthalate, can be used triallyl trimellitate and the like. The polymerizable monomer is preferably contained in the hologram recording medium 5 in an amount of 1% by weight to 50% by weight, and more preferably 2% by weight to 30% by weight. If the polymerizable monomer is contained in an amount of 1% by weight or more with respect to the hologram recording medium 5, the hologram recording medium 5 has a sufficient refractive index. If the polymerizable monomer is contained in an amount of 50% by weight or less, the volume shrinkage of the hologram recording medium 5 is reduced. For this reason, a good resolution can be obtained during reproduction of the hologram recording medium 5.

The polymerization initiator is used for initiating the reaction of the polymerizable monomer. The polymerization initiator is selected according to the wavelength of light irradiated on the hologram recording medium 5. Examples of the polymerization initiator include benzoin ether, benzyl ketal, benzyl, acetophenone derivatives, aminoacetophenones, benzophenone derivatives, acylphosphine oxides, triazines, imidazole derivatives, organic azide compounds, titanocenes, organic peroxides, and Examples thereof include thioxanthone derivatives. Specifically, benzyl, benzoin, benzoin ethyl ether, benzoin isopropyl ether, benzoin butyl ether, benzoin isobutyl ether, 1-hydroxycyclohexyl phenyl ketone, benzyl methyl ketal, benzyl ethyl ketal, benzyl methoxy ethyl ether, 2,2′-diethyl Acetophenone, 2,2′-dipropylacetophenone, 2-hydroxy-2-methylpropiophenone, p-tert-butyltrichloroacetophenone, thioxanthone, 1-chlorothioxanthone, 2-chlorothioxanthone, 2-methylthioxanthone, 2-isopropyl Thioxanthone, 3,3 ′, 4,4′-tetra (t-butylperoxycarbonyl) benzophenone, 2,4,6-tris (trichloromethyl) -1,3,5-triazine, 2- (p-methoxyphenyl) -4,6-bis (trichloromethyl) -1,3,5-triazine, 2-[(p-methoxyphenyl) ethylene] -4, 6-bis (trichloromethyl) -1,3,5-triazine, diphenyl- (2,4,6-trimethylbenzoyl) phosphine oxide, 1-hydroxy-cyclohexyl-phenyl-ketone, 2-benzyl-2-dimethylamino- 1- (4-morpholinophenyl) -butanone-1,2,2-dimethoxy-1,2-diphenylethan-1-one, bis (η ⁵ -2,4-cyclopentadien-1-yl) -bis ( 2,6-difluoro-3- (1H-pyrrol-1-yl) -phenyl) titanium, bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide, 2-methyl-1 [4- (methylthio) Phenyl] -2-morpholinopropan-1-one, bis (2,6-dimethoxybe Zoyl) -2,4,4-trimethyl-pentylphosphine oxide and 2-hydroxy-2-methyl-1-phenyl-propan-1-one, bis (2,6-dimethoxybenzoyl) -2,4, Mixture of 4-trimethyl-pentylphosphine oxide and 1-hydroxy-cyclohexyl-phenyl-ketone, bis (2,6-dimethoxybenzoyl) -2,4,4-trimethyl-pentylphosphine oxide and 1-hydroxy-cyclohexyl- A mixture of phenyl-ketone, a mixture of 1-hydroxy-cyclohexyl-phenyl-ketone and benzophenone, a mixture of 2-hydroxy-2-methyl-1-phenyl-propan-1-one and 1-hydroxy-cyclohexyl-phenyl-ketone, 1- [4- (2-hydroxyethoxy) -phenyl] -2-hydroxy-2-methyl-1-propan-1-one, di-t-butyl peroxide, dicumyl peroxide, t-butyl kumi Ruperoxide, t-butylperoxyacetate, t-butylperoxyphthalate, t-butylperoxybenzoate, acetyl peroxide, isobutyryl peroxide, decanoyl peroxide, lauroyl peroxide, benzoyl peroxide, t-butylhydro Examples include peroxide, cumene hydroperoxide, methyl ethyl ketone peroxide, and cyclohexanone peroxide. When the light applied to the hologram recording medium 5 is blue laser light, the radical photopolymerization initiator is like bis (cyclopentadienyl) bis [2,6-difluoro-3- (1-pyrrole) phenyl] titanium. It is preferable to use a simple titanocene compound. In addition, sensitizing dyes such as cyanine, merocyanine, xanthene, coumarin, and eosin, silane coupling agents, and plasticizers may be added as necessary.

In order to irradiate the hologram recording medium 5 in the cartridge 10 with light, a shutter 25 for opening and closing the housing 15 may be provided on the surface of the housing 15. The shutter 25 is made of metal, plastic or the like.

FIG. 2 is a diagram showing the label 20.

The label 20 has a structure in which the polymer layer 50 is sandwiched between the protective layer 40 and the reflective layer 60. The label 20 is provided so that the reflective layer 60 is in contact with the surface of the housing 15.

The protective layer 40 is transparent to visible light. For the protective layer 40, for example, plastic or glass can be used. As the plastic, for example, polyethylene terephthalate resin, polyethylene resin, polycarbonate resin or the like can be used. The protective layer 40 can reduce the rate of damage due to scratching from the outside, and deterioration due to oxidation or ultraviolet light. Plastic is preferable because it absorbs light having a wavelength in the ultraviolet region.

The polymer layer 50 includes a polymerizable monomer, a polymer in which the polymerizable monomer has been reacted to some extent by the polymerization initiator, and a matrix in which the polymerization initiator remaining unreacted is incorporated into a three-dimensional crosslinked structure. The hologram recording medium 5 and the polymer layer 50 are different in that the polymerizable monomer is polymerized by reacting to some extent by the polymerization initiator by light irradiation. That is, it can be said that the material constituting the polymer layer 50 and the material constituting the hologram recording medium 5 are substantially the same. That is, the polymer layer 50 includes a material constituting the hologram recording medium 5. The film thickness of the polymer layer 50 is preferably 1.5 mm or greater and 2.0 mm or less.

The reflective layer 60 is used to make the label 20 easier to visually recognize by reflecting light incident on the label 20. For the reflective layer 60, for example, a metal plate, a thin film plastic deposited with metal, or white paper can be used.

The protective layer 40 and the reflective layer 60 may not be used for the label 20.

Next, the manufacturing method of the polymer layer 50 is demonstrated.

A three-dimensional crosslinking material, a polymerizable monomer, a polymerization initiator, and the like are mixed to form a solution. This solution is gelled and cured into a plate. Curing is performed, for example, by filling a gel on a flat support substrate. In addition, there are a roll-to-roll method and a printing method as a curing method.

Next, the polymer layer 50 can be manufactured by reacting the polymerizable monomer and the polymerization initiator by irradiating light having a wavelength at which the polymerization initiator starts the reaction.

Thereafter, the protective layer 40 and the reflective layer 60 are bonded to the polymer layer 50. The light irradiation may be performed after the protective layer 40 and the reflective layer 60 are bonded to the polymer layer 50.

Next, the operation principle of the cartridge 10 will be described.

The hologram recording medium 5 provided in the cartridge 10 deteriorates as the date passes.

FIG. 3 shows the result of a deterioration test of the hologram recording medium 5. The vertical axis represents the recording life (year) of the hologram recording medium 5. The horizontal axis indicates the temperature (° C.) at which the hologram recording medium 5 is stored. The recording life indicates a time during which the signal intensity of the reproduction light when the light applied to the hologram recording medium 5 is extracted as reproduction light is reduced from the initial signal intensity to 80%.

Plotting was performed against the reciprocals of the respective temperatures of 60 ° C., 80 ° C., and 100 ° C. (referred to as Arrhenius plot), and the recording life at 15 ° C., 20 ° C., and 25 ° C. was obtained by extrapolating the straight line.

As can be seen from FIG. 3, it can be seen that the lifetime of the hologram recording medium 5 varies greatly depending on the temperature.

It is known that the hologram recording medium 5 changes its color to yellow when the organic material in the hologram recording medium 5 deteriorates. This is called yellowing. Due to yellowing, the transmittance of the hologram recording medium 5 with respect to light decreases, and the signal intensity of the reproduction light decreases. Therefore, even if an attempt is made to reproduce the hologram recording medium 5 after a certain period of time has passed, there is a possibility that it cannot be reproduced because it has deteriorated due to yellowing. Since the hologram recording medium 5 is provided in the light-shielding casing 15, it is difficult to determine whether or not the hologram recording medium 5 is yellowed. Furthermore, since the recording life varies greatly when stored for a long time, it is preferable to grasp the state of the hologram recording medium 5 more easily. In other words, it is preferable that the user appropriately grasps the recording life in accordance with the environment where the hologram recording medium 5 is substantially stored.

The polymer layer 50 of the label 20 provided on the surface of the housing 15 is made of substantially the same material as the hologram recording medium 5 provided in the housing 15. For this reason, the state of the hologram recording medium 5 can be grasped only by visually recognizing the label 20. Unlike the hologram recording medium 5, the label 20 is provided on the surface of the housing 15. For this reason, the polymer layer 50 of the label 20 deteriorates earlier than the hologram recording medium 5 in the housing 15. Therefore, the user can recognize the expiration date of the cartridge 10 at an early stage by looking at the label 20.
(Modification 1)

FIG. 4 is a view showing a modified example of the cartridge 10. The difference from the first embodiment is that the indicator portion 70 is provided on the surface of the housing 15. The indicator portion 70 may be embedded as long as the surface of the indicator portion 70 is exposed from the housing 15. For example, the indicator unit 70 is provided with a color in which the hologram recording medium 5 is yellowed and cannot be recorded and reproduced. The degree of yellowing of the hologram recording medium 5 can be easily grasped by comparing the index unit 70 and the label 20.
(Modification 2)

FIG. 5 is a view showing a modified example of the label 20. FIG. 5 is a view of the label 20 as viewed from a direction perpendicular to the stacking direction. As shown in FIG. 5, the thickness of the polymer layer 50 of the label 20 decreases from one end of the label 20 toward the other end. The reason why the thickness of the polymer layer 50 decreases from one end to the other end is as follows.

In the place where the polymer layer 50 is thick, the light transmittance is attenuated. This is because the absorption strength increases. On the other hand, in the place where the polymer layer 50 is thin, the light transmittance increases. Thus, by providing the place where the film thickness of the polymer layer 50 is thick and the place where it is thin, it is possible to grasp the degree of yellowing deterioration step by step. Even if the thickness of the polymer layer 50 does not decrease from one end to the other end, the thickness of the polymer layer 50 may not be uniform.
(Modification 3)

FIG. 6 is a view showing a modified example of the cartridge 10. In the cartridge 10 according to the first embodiment, a diagram is shown in which the label 20 is provided on the surface of the housing 15 having a large surface area. As shown in FIG. 6, the label 20 may be provided on a surface having a small surface area. By doing in this way, the label 20 can be easily visually recognized even when the cartridges 10 are stacked. Moreover, as shown in FIG. 7, you may provide the label 20 on both the surface with a large surface area, and a surface with a small surface area. By doing in this way, the label 20 can be visually recognized from two directions.
(Example)

A polymer layer 50 was produced.

A solution was prepared by mixing a three-dimensional crosslinking material, a polymerizable monomer, a polymerization initiator, and the like. As the three-dimensional crosslinking material, 2.28 g of 1,6-hexanediol diglycidyl ether was used. As a curing agent for the three-dimensional crosslinking material, 0.61 g of tetraethylenepentamine was used. As the polymerizable monomer, 0.15 g of 2-vinylnaphthalene was used. 0.014 g of bis (cyclopentadienyl) bis [2,6-difluoro-3- (1-pyrrole) phenyl] titanium was used as a polymerization initiator. These were mixed and degassed to obtain a solution.

This solution was spread on an unmodified glass substrate having a thickness of about 1 mm, and a spacer of a polytetrafluoroethylene (PTFE) sheet was further arranged on the glass material. Then, another unmodified glass substrate was prepared on these, and the solution and the spacer were sandwiched between these two unmodified glass materials and fixed. In order to investigate how the light transmittance changes due to the change in the film thickness of the polymer layer 50, the film thickness of the spacer is 0.2 mm, 0.5 mm, 1.0 mm, and 1.5 mm. Was made.

Thereafter, the solution was allowed to stand at room temperature for 4 days to cure the solution. The polymer layer 50 was prepared by reacting the polymerizable monomer and the polymerization initiator by irradiating the cured solution with an LED (Light Emitting Diode) having a wavelength of about 405 nm for about 4 hours.

FIG. 8 is a diagram showing the transmittance (%) and the passage of time (hrs) of the polymer layer 50 produced with the spacers having a thickness of 0.2 mm, 0.5 mm, 1.0 mm, and 1.5 mm. The vertical axis represents the transmittance (%). The abscissa indicates the elapsed time (hrs).

The transmittance was measured by irradiating the polymer layer 50 with an LED having a wavelength of about 405 nm.

The polymer layer 50 was artificially deteriorated by placing the polymer layer 50 in a constant temperature bath at 70 ° C. Yellowing was observed in all the polymer layers 50 as time passed. It was found that the transmittance decreased as the film thickness increased.

Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 5 ... Hologram recording medium, 10 ... Hologram recording / reproducing cartridge (cartridge), 15 ... Housing, 20 ... Label, 25 ... Shutter

Claims (5)

A housing,
A hologram recording medium provided in the housing;
A polymer layer provided on the surface of the housing and containing a material of the hologram recording medium;
A cartridge comprising: A protective layer provided on the polymer layer;
The cartridge according to claim 1, further comprising:   The cartridge according to claim 2, further comprising a reflective layer between a surface of the casing and the polymer layer.   The cartridge according to claim 1, wherein an index portion is further provided on a surface of the casing.   The cartridge according to claim 1, wherein the thickness of the polymer layer is not uniform.

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